EP3387589A1 - Mobile visual assistance in steel, rolling, forging and pipe mills - Google Patents

Abstract

The invention relates to a visual assistance system comprising mobile devices for a maintenance worker in a plant to be serviced, stationary processors and a network, via which the stationary processors are connected to the mobile devices. In order to support work activities of the maintenance worker directly on-site in the plant, the visual assistance system also comprises: a graphical output device; a plant information system having maintenance-relevant documents for carrying out damage repair; and technical devices for detecting relevant components at servicing and inspection control points of the plant.

Description

 Mobile visual assistance in metallurgical, rolling, forging and tube works

Summary

Mobile visual assistance for the operation of metallurgical and rolling mill plants as well as plants for forging / pipe technology by means of mobile portable information and communication technologies (ICT) and Industrie 4.0 technologies as well as model-based approaches with the goals:

Provision, presentation (visualization) and editability of relevant information to anytime and anywhere to support the respective work processes.

-Efficiency and effectiveness increase, z. As in the field of maintenance, by targeted and thus quickly finding sought-after plant components and the ability to get a quick and clear overview.

Relevant operating areas are for example the production, the

Quality management, maintenance and new construction planning

(Model = geometry models and simulation models, as well as their couplings)

Components of the Mobile Visual Assistance

· Mobile Information and Communication Technologies (ICT)

• Industry 4.0 technologies

 • Establishment or access to a plant information system (eg BDIS) as well as to other database systems such as IBFS, QMS, ....

• model-based approaches: model = geometry models and simulation models, as well as their couplings The characteristics of the access technologies used can be:

 o Global, local, wired and wireless networks

 o Cross-company (WWW, WWW with VPN, ...)

 o Internal: Cross-plant

 o Internal: factory internal

be

introduction

 The automotive industry is characterized by shorter

Product life cycles, increasing number of variants, high quality standards and increasing complexity of the products. The metal producing and processing industries as a supplier industry must meet these requirements. A crucial competitive factor is the availability of (general) production-relevant information, which should be available at any time, in any place and for any employee.

This is a challenge within the individual production areas of, for example, steel mills today; Although the information is generally available, but the traditional paper-bound

Information provision z. B. by means of drawings significant disadvantages. More advantageous may be the use of digital information, but access is often restricted to stationary PCs (office workplaces) that are only available at certain stationary workplaces (control rooms, control rooms) in the workplace (heat, steam, dusts, hazardous working environment).

concept

 The idea relates to devices and methods for performing

On-site work activities in metallurgical and rolling mill plants as well as in press, forging and tube plants using a scalable system for mobile visual assistance in production. Relevant operating areas are, for example, production, quality management, maintenance, as well as reconstruction measures by the new building planning departments, as well as materials management. Subsequently, the scalable visual assistance system will be demonstrated using the example of "mobile visual assistance in maintenance".

The maintenance of the functional safety and energy efficiency of facilities in the field of metal production and primary shaping also require regular inspections from the point of view of environmental protection. These energy-intensive industrial plants incorporate function-relevant components with a limited lifespan. Permanently reliable operation of the system is only guaranteed with proper maintenance. Against this background and taking into account the guidelines and regulations to be observed (eg safety and environmental protection), a large number of inspection and maintenance work must be carried out.

Definition of terms maintenance

 The following definitions of terms are used below:

The maintenance (IH) is divided into maintenance and

 Recovery actions.

 Conservation measures include:

 • Inspections (activities are limited to the determination of the actual condition), d. H. during an inspection, it is determined if maintenance is required

 • Maintenance (activities to maintain the required state)

The recovery measures include: • Repair (activity to restore the TARGET state).

During inspection and maintenance work, the condition of wearing parts must be checked; if necessary, wear parts are replaced. During maintenance, function-relevant components (spare parts) may be exchanged to restore the TARGET function.

The scope of inspection and maintenance depends on the type of equipment, the components of the system, the environmental influences, the user habits and the manufacturer's information. The replacement of wear and tear

 Spare parts may be part of the maintenance or a repair order. Self-diagnostic devices are only to be considered with regard to the extension of the inspection intervals if all inspection-relevant functions are self-monitoring.

Typical inspection activities are z. B. a general condition check, visual and functional control of all claimed parts including the

Safety and control equipment, verification of gas, steam and water bearing system parts for leaks, visible corrosion and

Aging phenomena and a final inspection of the inspection work by measuring and documenting the measurement and test results.

Examples of typical maintenance work include the replacement of consumables, the refilling of consumables (lubricating oil, greases, cooling water) and final inspection of maintenance work by measuring and documenting the results.

The maintenance strategy, z. B. at what time is used, it may be failure-oriented or prevention-oriented or condition-oriented, z. B. determined with self-diagnostic facilities (predictive IH) be.

Accordingly, you can maintenance processes u. a. according to plan

Maintenance via maintenance request and order, after failure-related maintenance (can not be planned, immediate on-site readiness, shortest system reaction times required) as well as on schedule

Maintenance (maintenance and inspection according to maintenance plans). Economic significance - maintenance

 Improved and faster information transfer leads to faster

Results and quality improvements within the maintenance

(Fault management, fault avoidance / optimization). The consequences are

Reduced costs by minimizing downtime and avoiding unplanned downtime and potential production downtime. The

The quality and efficiency of maintenance depends very much on the personal experience of the respective prior art

Maintenance personnel. Increase of responsibility in the context of personnel savings due to high cost pressures, leading to a worsening of this problem (formerly responsible for the

Converter plant, now: additionally the continuous casting plant)

Maintenance-relevant information

In the above-mentioned maintenance tasks in industrial plants, a large number of maintenance-relevant information must be available,

such as B .:

 • assembly, disassembly and operating instructions; Safety instructions

 Instructions for maintenance and care (eg manufacturer's maintenance instructions and instructions, maintenance plan, care instructions), parts lists of the device manufacturers (list of spare parts, wear parts and required auxiliary material), troubleshooting (troubleshooting information)

 • knowledge of the accident history (damage / alarm messages,

Maintenance activities, etc.) for traceability and root cause analysis in the incident management • Knowledge of the structure and overall overview of the relevant installed media supply and their connection to the functional systems: Medium A flows through pipeline B with the required operating pressure p; electrical supply (power / signal and control cables).

Special features in the maintenance of large systems z. As the metallurgical and rolling mill industry

 In addition to the traditional maintenance and inspection tasks each

Industrial plants have major industrial facilities in the field of

Metal production and primary shaping thereby about additional specific problems:

 High degree of complexity due to the networking of a large number of

 subsystems

 • Production facilities with extensive hall areas and a strong spatial extent of the factory premises. This is associated with a very high number of maintenance and inspection bodies

 • Grown, heterogeneous system landscape: the (sub-) systems used are complex and consist of a large number of different components with their individual functionality, using devices from different manufacturers, often with different generations of technology

• application of various inspection technologies; In doing so, a large number of running processes and plant components are not visible

 • Variety of weary components and critical

 Machine parts (eg guide devices, tools, motors, gearboxes, bearings, etc.) within the system which influence the quality of the system product or the service life of the machines and machines

 System components are essential

 • Partly hazardous working conditions during testing and maintenance

• Maintenance work is carried out locally (not in a workshop environment) on site in the plant ("in the field") temporary workplace no access to information systems (BDIS or IBFS) possible.

State of the art - disadvantages of previous solutions

 The traditional paper-based information provision by drawings and descriptions as well as handwritten montage reports have disadvantages, such. B .:

 a) poor lighting conditions or shadow zones on site at the plant (z.

 B. the cooling chamber of a continuous casting plant)

 b) cumbersome handling: u. Limited space, uncomfortable postures, limited movements.

 For example, there is not enough space to deposit, so that at least one hand is needed, or the space is limited so; that the maintenance person must change the place between the place where the drawing was hung up and the working space of the assembly

 c) the required visual shift (movement of the eyes, which is carried out to direct the view from the drawing to the working space of the assembly); Information about installation or operation is not projected directly into the workspace. Particularly inconvenient in uncomfortable posture or limited range of motion

 d) adverse environmental conditions, such as water, steam, dust, heat and corrosive equipment

 e) as well as the low flexibility (during the activity will become more

 Information required, no complete information).

Point (e) contains another major weakness of the traditional way of working: a common problem in practice is the indication of an unclear fault description by the production. Messages such. B.

"System defect" or "system failure" does not allow maintenance unambiguous working formulations so that there is no actionable information, what to do ?, what information is required?

Digital work aids such as industrial PCs or industrial notebooks can be used in temporary workplaces - especially in hazardous work areas and due to the harsh operating environment (dust, heat, water or water)

Steam) - not be set up or used effectively. Mobile devices such as the PDA systems primarily used are too unergonomic to operate. The depiction of a complex maintenance protocol consisting of several DIN A4 pages or complex drawings is only possible with great effort for the maintenance personnel. Furthermore, it is necessary for the maintenance engineer to carry out his primary work task (eg

Disassembly of removable parts) interrupts, as the operating principle

(Interaction paradigm) of mobile computing is based on user interfaces that are used in classic desktop applications (WIMP: = "window icon, menu, pointing") .The user can either operate the mobile device or perform its actual task Freehand operation (hands-free interaction), such as controlling, moving 3D data models of a component (3D CAD model) through the head movement of the user, allow new techniques of the invention

Human-computer interaction (HCl). Example of such new ones

Interaction techniques and paradigms include virtual reality (VR) technology, augmented reality, and wearable computing technology. Since VR technology is by definition limited to representing a virtual space and only a small proportion of real-world environmental objects are included, it is unsuitable for supporting mobile workers on site in the field.

Wearable computer systems as well as Augmented Reality (AR) technology have the night parts of a too small and impractical display (data glasses, PDA) already mentioned in the PDA-supported solutions. Another traditional communication channel for obtaining information is the communication of the maintenance engineer on site in the system with the plant control center or various control rooms (= central collection point all relevant plant and process information and measured values) by means of radio. The verbal communication is efficient when asked (which display value can be seen?), But ineffective at extensive

Information (how is the cable history?). aim

The invention has for its object to provide a flexible solution for the design of a mobile information system for technicians or general. for operators in the shop-floor area, as a visual assistance system, to support on-site work on metallurgical and rolling mill plants, as well as in press, forging and tube plants (hereafter referred to as "factory floor") as a "mobile visual assistance system").

The goal is to provide and display (visualize) relevant information anytime, anywhere for each employee to be available to support their respective work processes. Furthermore, the use as a mobile, interactive documentation system.

 The visual assistance system should increase the efficiency and effectiveness of the work in the direct production environment (no office environment!)

allow, for. As in the field of maintenance by targeted - and thus faster - finding sought-after plant components (fast

Error detection) as well as a quick troubleshooting. This requires z. For example, you have the opportunity to get a quick and clear overall overview as well as the mobile provision of data and relevant documents. solution

 According to the invention the object is achieved in that the possibilities of modern techniques of mobile portable information and

Communication technology (ICT), such as the use of augmented reality technology, wearable computing and mobile devices, as well as the use of special asset information systems (as a database) are deployed, enabled, and combined.

Furthermore, hybrid approaches are used by combining devices or the technology used in the area of the displays used, in the area of localization and location (where is the maintenance engineer ?, where is the sought-after component?), As well as in the area of the access technology used for data transmission.

The combinations are used specifically to compensate for weaknesses of the one by strengthening the other system. The goal of this effort is to increase the accuracy, reliability and robustness of the various system components.

As an example of the possible characteristics of the access technology used for the mobile access to data sources away from the office workplace, the following technologies are listed:

 o Basic types: global, local and ad hoc networks

 (wired and / or wireless)

 o Cross-company: via WWW, WWW with VPN or a dedicated (data) leased line (eg without public IP address assignment)

 o Internal: Cross-plant

 o Within the company: internal factory (eg factory radio network,

 WIRELESS INTERNET ACCESS)

o personal network (PAN), e.g. B. Wireless Personal Area Network (WPAN) In doing so, the devices of the PAN, ie the wearable computer (portable

Data processing equipment), be integrated into a LAN. For example, the user of a PAN device can match his stored data with a database on a network server. Furthermore, an intranet or Internet access for the PAN device can be created by integrating with the LAN.

Furthermore, Industry 4.0 technologies are to be used, such as: For example, new machine-to-machine communication required for the application of "Internet of Things (loT)" to production, concrete examples being machines equipped with cyber-physical systems (CPS), or Plant components and their spare parts (smart objects) as well as suitably equipped plant products, such as slabs, wound coils, sheets (smart products), which are networked with each other (communication by means of

Wireless sensor network).

In addition, special data models are to be used (virtual prototypes of the plant), which are expanded (enriched data), for. B.

Maintenance-relevant information, which are located on the geometry model of the plant (or the machine and its components) and can be found quickly.

With the help of these special data models will be a new way and

Working method for fast and safe locating of

Maintenance-relevant information, such as the identification of machine or spare parts ¹ allows.

Usually the search for the correct machine parts is done via (i)

Material numbers and (ii) structure / parts lists (eg the parts lists of the

¹ From working time studies, it is known that the maintenance worker uses an average of 10% of his daily working time to identify suitable spare parts and to find them in the warehouse [Biedermann 2008]. Device manufacturers (listing of spare parts) and (ii) using abstracted

Structural graphics (exploded view of the machine or 2D drawing) instead. The necessary information is in extensive repair,

Maintenance instructions, drawings, installation instructions, etc., and, in paper-based archiving, in bulky and confusing folders.

In order to find components with these special data models, it is possible, for example, to work according to the philosophy "from the rough to the detail." Via the navigation within the data model of the system, to the installation location of the system

superordinate main assembly and the subsequent interactive search for the relevant component, the maintenance engineer relevant machine or

Find spare parts, eg. During the planning of maintenance work. Furthermore, the subsystems for calculating the current field of view of the maintenance person on site in the plant (position determination by means of outdoor / indoor systems, detection of the viewing direction / orientation by means of electronic compass, etc.) can be coupled to the special data model. The result is a tracked 3D plant model, in which the current position and

Viewing direction of the maintenance engineer within the real plant is identical to the position within the virtual plant (data model). For example, the user can find components by subsequent interactive search.

In addition to effective navigation methods, such as B. the o. G. direct

Transfer of user orientation to the orientation of the virtual camera within the 3D plant model or navigation through previously stored views are filter, detail and context techniques such. For example, filtered views of the plant, filtered according to the type of fault message or according to the user group (maintenance electrician) used.

The flexibility of the "mobile visual assistance system" is achieved, for example, by the system having different types of displays

(Data glasses, arm-mounted display, industrial tablet PC) allows and combines can be (multi-display environment of the mobile assistance system). The combination with different display devices of different display sizes makes sense, because detailed data can hardly be displayed on data glasses due to the limited readability.

Use:

 This invention encompasses all jobs of production,

Quality assurance and maintenance as well as activities in the new or re-planning of facilities of metallurgical plants and rolling mills as well as in press, forging and tube plants, where the work activities are carried out directly on site at the plants. It does not include activities in technical offices or in the control rooms of the facilities where z. B. the information is obtained on conventional PC workstations, with mouse and keyboard as

Input devices designed for typical office use ("office environments").

Technical Instructions

 A so-described mobile visual assistance system consists at least of the components robot, safety sensor system, safe control and human machine interface (manual control, voice control)

A so described mobile visual assistance system exists

at least from the components:

• powerful calculator with a powerful graphics card on which

corresponding software application run. It can be a wearable computer and / or a rugged industrial tablet PC for extreme work environments (eg IP54) and stationary computers (servers, ...) connected to the network via a network (eg WLAN) connected to before mentioned mobile devices Alternatively, when using distributed applications or the use of cloud-based solutions (see under Software in the text below) can be dispensed with powerful computers.

 • graphic output device. Such a display system (display) may be an AR data goggles (head-mounted display, HMD), preferably as a See See Through Optical System (OST-HMD), and / or an Arm-Mounted Display or Wrist-Mounted Display (wrist-mounted display) and / or the display of the industrial tablet PC.

• Subsystems for reliable and accurate determination, such as: B .:

 o of position and movements as well as direction of view (orientation) of the

User (mobile tracking), e.g. B.

^■ the combination of a GPS subsystem in the form of a

 Industrial-grade standalone GPS module for position determination and a gyroscope or electronic compass (magnetic field sensor) for the

Determination of the viewing direction

o of position and orientation of all relevant objects ² in the user environment; This location gives indications of the spatial positions of components (eg for component identification of machine parts) or of assembly sites

^■ Camera for capturing the real environment or for capturing pictograms (markers)

^■ Various sensors

over different distances and under changing

Environmental conditions, eg. B. the use outside or inside of

Buildings (outdoor localization and indoor localization).

For this purpose, various tracking methods (optical, video-based tracking, inertial tracking methods / inertial navigation systems, RFID

² Should objects in reality interact with virtual objects or their associated objects?

Contextual information must also be known about its position and orientation. Tracking, ...) and their combinations, cf. z. B. [Köppe 2014], are used.

For this purpose, an outdoor and indoor position and orientation system

such as GPS localization (eg WAAS, RTG-GPS, mmGPS for outdoor use) or indoor (eg MIT or MagicMap ³ cricket system). Recent localization technologies and their advancement range from satellite positioning to combined

Location solutions such as awiloc (WLAN, GPS, INS) for z. As buildings, wireless sensor networks such as s-net and flexible positioning technologies such

BlackFIR to high-precision localization methods such as RedFIR, cf.

[2014 Fh-IIS_CPS_NOP_Broschuere].

 • Technical devices for component recognition (reading devices for Auto-ID systems, scan function), such as: B .: Barcode reader or RFID reader The relevant system and machine components at the maintenance and inspection control points of the systems are to be used with z. For example, additional installed hardware components pictograms (markers) for markerbased tracking (eg QR code) equipped, or by means of coordinates (stationary tracking of the AR system) or based on "Markerless-3D" tracking of the AR system Polluted environments use RFID tags as markers.

 • Hardware for communication with stationary servers (content servers) and other mobile devices, e.g. WPAN, WLAN or UMTS

 • Hardware for online communication between the maintenance engineer "on site" and other internal experts (company / company internal) or external

Experts (Teleservice with mechanical engineering companies). The communication can be text-based, with video / audio transmission (expert sees, for example, the damage image on-site) as well as transmission of relevant sensor data

³ Position determination based on wireless standards such as WLAN, RFID, Bluetooth, Zigbee, GSM and UMTS (Multimedia support for fault finding and elimination at

 Involvement of "remote experts").

 • AR applications and other relevant applications, such as: Eg: Magic Map, virtual asset information system, digital manuals (with / without

 Interaction for 3D models)

 Software: the software applications used in the mobile visual assistance system can be monolithic as well as distributed applications, i. they do not just run on the mobile device, but certain

 Subsystems of the application run on stationary servers that over

 Networks are connected to the mobile device. examples are

 Databases that prepare and provide necessary data for the execution of the application, such as e.g. Maps of a building,

 Manuals, etc. Also, it is conceivable the required graphic

 To run calculation in the presentation of 3D models of the system on stationary computers, the mobile system in this case only serves to record video images from a camera to send to a server, the enriched images (augmented images) again from Server to receive and display. Cloud-based solutions can also be used for this.

For controlling or interacting with the connected computers of the mobile visual assistance system, in addition to the input via the camera (eg the data glasses or the helmet camera) also via a data input via

Pen / handwriting recognition (pen operation) done or if necessary by means of

Voice recognition. Furthermore, various mobile peripherals such as keyboard can be connected, the z. B. via Bluetooth (Bluetooth Keyboard) are coupled.

The solution according to the invention is illustrated in the attached figure. Specific operating example: fault-related maintenance processing - Comparison: with and without assistance system

Example scenario with and without a visual assistance system for the maintenance engineer: In the control station of the continuous casting plant, the level indicator for the hydraulic systems of the strand guide segments drops from 90% to 30%. This incident occurs during the casting process. There is no standstill for a repair. Possible causes of malfunction could be: a sensor error of the level gauge or a leak in the hydraulic system.

The plant operator in the control room instructs employees in mechanical and electrical maintenance to troubleshoot and repair them. The

The cause clarification by the two maintenance engineers takes place during full plant operation. The personal equipment of the maintenance personnel is:

 According to method (A) "visual assistance system": the usual work equipment consisting of radio with battery for the exchange of information with the central control station and helmet with helmet lamp and the relevant

Tools, extended by the components of the previously described visual assistance system. The relevant information is available digitally, by

appropriate access to the asset information system and the

model-based information; or

By method (B) "traditional type": the usual working equipment (radio, helmet with helmet lamp, "relevant tools"), and paper-based information carried by the maintenance due to the failure report from production. State of the art "discussed vulnerability of the traditional

Working method: the direct interaction between unclear

Fault description and ineffective fault resolution. The relevant tool is carried along to the maintenance due to the failure report of the production, in this case, for example, repair case with

Voltage detectors. The troubleshooting and repair is done either by working off

Points within a fault manual or on the basis of personal experience (diagnostic competence), the work ideally takes place systematically, z. B. on the principle of groping search for

Error limitation or troubleshooting according to the U method. The basic steps are illustrated below by way of example. Using new Industry 4.0 technologies, such as with sensors and

embedded systems with their own IP address

System components (eg a motor), for example, an error code can be transmitted via radio (or another interface) in case of failure of the engine, which triggers a fault message in ERP systems or IPS solutions.

In the following, these different cases are to be considered: with error code-based troubleshooting and without troubleshooting (own diagnostic competence).

Case: with error code based troubleshooting

 For example, the hydraulic systems of the strand guide segments have Industry 4.0 technologies, such as: B. via integrated communication-capable sensors for latent monitoring. This system becomes active when sensors register the sharp drop in the level indicator. A fault message is triggered automatically. B. to a relevant IT system of

Maintenance such as a Maintenance Planning and Control (IPS) system, such as SAP PM. Additionally - in this example - an error code is given. By method (A): The error message appears with error code in the IPS system, eg. On the workstation of the maintenance master.

Due to the urgency, a maintenance contract with the IPS is triggered directly. The maintenance technician "in the field" can send this message directly as a message to the victims, not only the

Error code transmitted, but also the malfunction and a troubleshooting in digital form to be sent. The maintenance engineer calls the required maintenance-relevant information via the system information system

Documents for carrying out the damage repair.

According to method (B): The maintenance engineer "in the field" receives a report of the incident via the radio set. The error code and a description of the malfunction may be communicated orally in the course of the event.A provision of technical drawings and maintenance documents on site is not possible! Documents have to be procured by the maintenance engineer, eg from the maintenance workshop.With the large systems considered here, with the large spatial distances of the plants, alone the necessary long travel times lead to an extension of disturbance times.Conclusion - Case: with error code based troubleshooting according to method B:

The traditional way of working has the following disadvantages:

 • high proportion of travel time (procurement and transfer of working papers)

• Information gaps

 • manageable data quality

and thus leads to prolongation of disruption times, to production and

Loss of quality.

Case: without troubleshooting (own diagnostic competence required) 1 . Step: verification of the alarm message; here: Checking the tank contents by means of oil dipstick. This is the orientation at the place of the accident and the

Localization and correct identification of relevant plant components and parts necessary. The required information is z. B.

Location information on "which tanks are eligible?", "Where is the tank (s)?" and "where is the measuring tube and the dipstick".

By method (A): Search query by display to the

System information system and possibly with additional information of

Component recognition by means of the data glasses. This could be z. B is the display of the component name, which is also displayed in virtual form in the current field of view (the real working environment) of the maintenance engineer. Alternatively, the display of the relevant locations or components based on digital maps and drawings on the additional, mobile displays (wrist-mounted display or industrial tablet PC) can be done. The current position and / or gaze position of the maintenance engineer is tracked (tracked) by means of the indoor systems and displayed on the display (data goggles or additional displays) (eg level: Hüttenflur, plant area: hydraulic space XY of the continuous casting plant Z).

Furthermore, the current position can also be displayed, for example, within the dynamic 2D layout plan (layout plan of the installation) or with the SD installation information model (eg for orientation within the central hydraulic system or a ventilation center).

According to method (B), the maintenance personnel must have carried these relevant paper-based documents to the location of the incident due to the production fault report.

The orientation within the system ("where am I in the system?", "What do I see?") Must be ensured by the maintenance engineer based on his experience. Another required information may be the question "What is the current level reading?".

 According to method (A), the maintenance engineer has access to the system information system, in this case, with the aid of the additional wearable computer and the radio network

Operating data information system. He can display the corresponding display (display of signals within the HMI of the automation level 1) on the additional displays.

 When using Industry 4.0 technologies, such as wireless sensors that communicate using wireless radio technologies, the

Possibility to display the wirelessly transmitted information on the additional displays and to assign them to the spatially related components.

By method (B) call the maintenance engineer at the control center or in the

Set computer room and corresponding inquiry ("please read the display value of tank filling measurement xy").

2nd step: Limitation by fault diagnosis to clarify sensor or

Process errors. In the case of sensor errors, the casting process can be continued. In the case of a process error, it is necessary to a) weigh up whether the casting process can be safely continued and b) identify the affected components. For example, is it an electrical / electronic problem or a hydraulic one? Possible test measures are, for example, the measurement of electrical voltage conditions at certain measuring points or checking the hydraulic system for leaks. For this purpose z. For example, the following information is available: At which measuring points can electrical voltage states be tapped? What are the cable names? Where are the relevant piping and components (filters, ...) of the hydraulic system (pressure and tank lines, control oil lines, hydraulic units, control blocks, etc.)? The relevant sources of information (documents) are z. B. Circuit diagrams and cable plans with the numbering of cables and hydraulic circuit diagram with numbered pipe outlets z. B. of the aggregate. By method (A): localization of the relevant components (electrical or hydraulic) either automatically by means of tracked goggles and display in the glasses display or by information access to the

Plant information system, for example by means of a tracked 3D plant model and automatic specification.

Method (B) requires maintenance personnel to have (or had anticipated) this relevant information in paper-based form due to the production fault report to maintenance at the location of the failure. Another possibility is the oral communication via two-way radios, in which the maintenance staff missing information, such. For example, the maintenance manager or other experts. 3rd step: Maintaining a basic functionality for the operation of the system, here: refill tank. For this purpose z. B. information for filling and possibly bleeding the tank and the specification of the hydraulic oil to be known.

Relevant sources of information (documents) are the maintenance documents of the hydraulic system with safety instructions.

By method (A): By information access to the asset information system. The risk of filling in a wrong hydraulic oil is thereby eliminated.

According to method (B), the maintenance personnel must have carried this relevant information (see step 2).

4th step: the damage can be localized exactly; burst hydraulic hose in a difficult to reach and difficult to see place. The affected machine component (segment of the strand guide) is set to the current

Position secured (thus the component is also without hydraulic system operable). For this, the corresponding information must be available to the maintenance personnel.

By method (A): By information access to the asset information system, eg. On electronic document (e-book) or on video files of an interactive instructional film (utility film) with a step-by-step guide.

According to method (B), the maintenance personnel must have carried this relevant information (see step 2).

Both methods would require an oral request from the on-duty shift master to obtain approval for the change to the facility. According to method (A), a corresponding message could be sent by the maintenance engineer to the control center using the system information system.

Furthermore, handling of the leaked hydraulic oil must be clarified, such. B. there is a risk of fire or explosion. Eventually, the company fire brigade must be notified, for. B. when leaving large amounts of oil (the volume of the hydraulic tank can be several hundred liters of hydraulic oil).

 By method (A): By information access to the asset information system. By concrete information on the type of oil could z. B. the factory fire brigade carry the appropriate binder directly.

 According to method (B), the maintenance personnel must have carried this relevant information (see step 2).

5th step: another casting operation with fixed segment; Clarification, whether a damage correction at the next pouring break is possible. For this, the pouring pause (normal value approx. 30 min) must be extended in coordination with the upstream converter or melting operation. The necessary spare parts must be identified quickly and correctly (hose type, nominal diameter, maximum working pressure, ...). Furthermore, it must be agreed with the in-house central warehouse, whether the spare part is available until the next casting break.

The correct identification of the hydraulic hose by reading the marking on the hydraulic hose and on the compression sleeve can cause difficulties. For example, the hydraulic hose can be located in a difficult to reach and difficult to see place, or the hose name is wiped or abraded.

By method (A): By information access to the asset information system, eg. B. with the help of the relevant hydraulic schemes or operating instructions of the hydraulic system and by means of parts list for hydraulic hose lines. According to method (B), the maintenance personnel must have carried this relevant information (see step 2). If necessary, the dimensions

(Hose length) by hand by means of tape measure in hard to reach places to be measured. Step 6: By means of the correct identification of the required spare part (hydraulic hose), a request can be made to the company's own

Zentralmateriager done and clarified whether a damage correction at the next pouring break is possible. By method (A): By information access to the asset information system, eg. For example, via a connection to the warehouse, a program checks whether all materials are available or whether it has to be ordered. All data could then be automatically transferred to the central warehouse by means of an operating order, with information to the production (control center). The actions take place via the additional hand theids. After that, finally

be decided whether the production plan can be met. Cheapest case, a repair could be carried out at short notice, without a delay in the operation, so that neither quality and

Production losses take place. According to method (B), the information exchange between maintenance personnel, central warehouse and production (control center) takes place purely on the basis of an oral communication by means of a radio. Due to the loss of time in the communication between the various information carriers and decision makers and the need for explanation, then a repair is not possible in the short term. This results in quality losses (eg no soft reduction) or

Production losses.

Conclusion:

 • There were a variety of maintenance-relevant information

 required, such as the troubleshooting guide,

 Functional diagrams, circuit diagrams / cable diagrams, hydraulic diagrams, isometric drawings and constructive machine / plant drawings as well as layout and floor plans as a stock drawing

 • Maintenance staff binds other resources to method B, by repeatedly asking questions and collecting information verbally

Control center ("what is the display value now", "is the error message gone now") or other experts, eg. B. Maintenance Manager ("we had the error before ...")

 • instead of thick manual or (paper) collection of technical

 The maintenance engineer has access to a "digital

 Tool case "at the place of the supposed incident

 • by improving the navigation and orientation of maintenance personnel within the complex plant and its systems (piping systems, media facilities, ...), as well as the improved localization of the

Machine parts and components through the visual assistant, can locate potential sources of interference quickly and reliably and appropriate measures are initiated immediately by the maintenance engineer

 • the spare part for the function or assembly is made according to method A

 identified quickly, easily and correctly

 In the scenario shown, the production plan can be adapted on-line so that it could be complied with and no quality and

 Production losses took place

 • Method A allows a single maintenance engineer to maintain a larger machine park with the same plant availability than conventional method B.

Claims

claims: 1 . Visual assistance system, comprising:  mobile devices for a maintenance person in a system to be maintained; stationary computers,  a network over which the stationary computers with the mobile Devices are connected,  a graphical output device;  a system information system with maintenance-relevant information sources, in particular documents, for carrying out a damage repair; and  technical devices for the detection of relevant components at maintenance and inspection control points of the plant. 2. A visual assistance system according to claim 1,  characterized,  that the network is a Personal Area Network PAN, a Wireless PAN, a WLAN or a UMTS network, the network being cross-enterprise or  can be trained internally; and  wherein the network may be wireline or wireless based. 3. Visual assistance system according to one of the preceding  Claims,  characterized, in that the graphical output device is augmented reality AR-data glasses, eg in the form of a head-based display or a head-mounted display HMD, preferably embodied as a See Through System OST-HMD, and / or an arm / wrist-mounted Display and / or the display of an industrial tablet PC. 4. Visual assistance system according to one of the preceding  Claims,  marked by  a subsystem for the reliable and accurate determination of the position, movements and direction of vision of the maintenance technician, comprising a combination of a Global Positioning System GPS subsystem in the form of an industry-standard stand-alone GPS positioning module and gyrocompass or electronic compass for Determination of the viewing direction. 5. Visual assistance system according to one of the preceding  Claims,  marked by  a subsystem for determining the position and orientation of all relevant objects in the environment of the maintenance person, comprising a camera for detecting the real environment or for capturing pictograms and various sensors. 6. Visual assistance system according to one of the preceding  Claims,  characterized,  that it is the technical devices for the detection of  relevant components are reading devices for Auto-I D systems or scanners, such as bar code or Pictogram readers or RFI D readers for reading bar codes or Pictograms or to read out markers or RFID tags that identify the components. 7. A visual assistance system according to one of the preceding claims,  marked by  Hardware for online communication between the on-site maintenance engineer and other internal or external experts. 8. Visual assistance system according to one of the preceding  Claims,  characterized,  that the assistance system is scalable. 9. Visual assistance system according to one of the previous campaigns  Claims,  characterized,  that the assistance system has an outdoor or indoor position and orientation system. 10. Use of the visual assistance system to locate and locate a maintenance person or a sought-after component. 1 1. Use of the visual assistance system to support on-the-spot work on metallurgical and equipment installations  Rolling mills and in press, forging and tube plants by providing and displaying relevant information at any time and at any place for each employee, especially the maintenance engineer. 12. Using the visual assistance system as a mobile interactive documentation system. 13. A method for performing a damage repair by means of the visual assistance system according to one of claims 1 to 9;  having the following steps:  Registering a drop of a level indicator of a hydraulic system of a strand guide segment by a  communication-capable sensor;  Automatic triggering of a fault message and transmission of the fault message by the communication-capable sensor to a relevant information technology IT system of the maintenance, preferably together with an error code;  depending on urgency: automatic triggering of a  Maintenance order through the IT system, whereby the  Fault message is sent directly to the mobile device, in particular a handheld of a maintenance engineer on site, the  Fault message preferably not only the error code, but also the malfunction and a fault help in digital form; and  Invoke required maintenance-related documents to complete the repair through the  Plant information system. 14. The method according to claim 13,  characterized,  that for the orientation of the maintenance person at the place of the accident as well as for the localization and concrete identification of the relevant  Attachment components a search request to the  System information system is addressed, possibly with additional  Information of component recognition; and that the display of the relevant locations or components on the basis of digital maps and drawings on additional mobile devices, wherein the current position and / or viewing direction of the Followed by the indoor position and orientation system and displayed on the data glasses or on the additional displays of the mobile devices. 15. The method according to claim 13 or 14,  characterized,  in order to clarify whether there is a sensor error or a process error, a localization of the relevant electrical or hydraulic components to be tested is carried out either automatically by means of tracked data glasses and display in the glasses display or by access to the system information system and automatic indication. 16. The method according to any one of claims 13 to 15,  characterized,  that access to the system information system takes place for information for filling and if necessary venting a tank, for the specification of hydraulic oil, for ascertaining an explosion risk and possibly for notifying the plant fire brigade. 17. The method according to any one of claims 13 to 16,  characterized,  that after the damage has been localized, a step-by-step instruction is called up by the system information system in order to secure the affected system component at a current setting position. 18. The method according to claim 17,  characterized, that with the aid of the system information system a request is sent to the control station of the system with the request for release for a change of the system in the form of securing the system component on the current position. 19. The method according to any one of claims 13 to 18,  characterized,  that with the help of the system information system, an identification of a necessary spare part takes place, for example by  Provision of relevant hydraulic schemes or  Operating instructions of the hydraulic system as well as parts lists for hydraulic hose lines. 20. The method according to claim 19,  characterized in that  through information access to the asset information system, for example via a connection to the warehouse, a program checks whether all materials are available or whether they need to be ordered, and - in the latter case - then automated  Operating order to the central warehouse, preferably with  Information to the control center.