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US20130130603A1 - Automatically adjustable protection device for a grinding wheel - Google Patents

Automatically adjustable protection device for a grinding wheel Download PDF

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Publication number
US20130130603A1
US20130130603A1 US13/810,449 US201113810449A US2013130603A1 US 20130130603 A1 US20130130603 A1 US 20130130603A1 US 201113810449 A US201113810449 A US 201113810449A US 2013130603 A1 US2013130603 A1 US 2013130603A1
Authority
US
United States
Prior art keywords
grinding wheel
protection device
fixed portion
respect
containment structure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US13/810,449
Other languages
English (en)
Inventor
Thomas Andersson
Massimiliano Giucolsi
Matteo Anzini
Paolo Gaboardi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tenova SpA
Original Assignee
Tenova SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tenova SpA filed Critical Tenova SpA
Assigned to TENOVA S.P.A. reassignment TENOVA S.P.A. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ANDERSSON, THOMAS, ANZINI, MATTEO, GABOARDI, PAOLO, GIUCOLSI, MASSIMILIANO
Publication of US20130130603A1 publication Critical patent/US20130130603A1/en
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • B24B55/04—Protective covers for the grinding wheel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • B24B55/04—Protective covers for the grinding wheel
    • B24B55/045—Protective covers for the grinding wheel with cooling means incorporated

Definitions

  • the present invention relates to a protection device for a grinding wheel, particularly but not exclusively for a rotating grinding wheel made of an abrasive material.
  • the invention can in fact also be applied to other types of grinding wheels, for example also to so-called “CBNs” which have an extremely limited consumption.
  • Grinding wheels are employed in the field of grinding, for example of laminator cylinders, paper-mill cylinders, and others. Examples are rotating grinding wheels made of abrasive material, which act on cylinders or similar pieces being processed.
  • the grinding wheels are rotated inside protections or shelters.
  • the shelters of these grinding wheels must be designed and constructed for containing, under safety conditions, any possible fragments that can be released during the processing, also in the case of breakage or explosion of the grinding wheel during its rotation and of the engagement on the cylinder being processed.
  • these grinding wheels are currently enclosed in their own shelter, which generally consists of a fixed part (so-called hood), and a movable part (so-called tile) in addition obviously to a covering and movable protection device to have access to the hood for the substitution of the grinding wheel; in particular, these covers can be fixed to the hood by means of hinges and can be opened by rotating them; or by means of guiding devices in which case they can be made to slide manually or with a motor.
  • the tile can be regulated with respect to the hood in order to limit the peripheral portion of non-protected grinding wheel to the maximum, with a variation in the diameter of the grinding wheel itself
  • the operator does not know the wear of the grinding wheel moment by moment and in order to satisfy the safety requirement described above, he should verify, after each grinding cycle of the machine, the distance between tile and grinding wheel and consequently intervene to re-establish the safety distance by maneuvering screw controls and/or knobs which allow the tile to be regulated with respect to the grinding wheel.
  • the cooling fluid necessary for the grinding process causes jets which could, with time, endanger the health of the operator if they regularly reach the latter. It is consequently necessary to minimize the exposed surface of the grinding wheel, also on the side where there is access for substitution, in order to avoid jets and the accidental leakage of the cooling fluid as much as possible.
  • a general objective of the present invention is to solve the drawbacks cited above of the known art in an extremely simple, economical and particularly functional manner.
  • a further objective of the present invention is to provide a protection device for a grinding wheel, particularly but not exclusively a rotating grinding wheel made of abrasive material, which can be automatically regulated, without the necessity of complex measurements entrusted to the expertise of the operator for maintaining the correct distance between grinding wheel and outer covering element (tile) and, above all, without the direct intervention of the operator in a difficult, tiring and dangerous operation.
  • Another objective of the present invention is to provide a protection device, for example, for a rotating grinding wheel made of abrasive material, which prevents a significant leakage of cooling liquid in the processing phase, in every configuration of the protection device and for each diameter of the grinding wheel.
  • a protection device has been conceived, particularly but not exclusively for a rotating grinding wheel made of abrasive material, having the characteristics specified in the enclosed claims.
  • FIG. 1 is a schematic side view of a protection device for a rotating grinding wheel made of abrasive material produced according to the invention in a closed position;
  • FIG. 2 is a schematic view such as that of FIG. 1 in which some of the parts have been sectioned to allow a better understanding of the invention
  • FIG. 3 is a schematic view such as that of FIG. 2 in which some of the parts have been sectioned to allow a better understanding of the invention and which shows the configuration convenient for the insertion of a new grinding wheel;
  • FIG. 4 is a schematic side view of the protection device as shown in FIG. 3 ;
  • FIGS. 5 a , 5 b and 5 c are a further view such as that of FIG. 1 from above and an enlarged detail which shows the grinding wheel in contact with the sensor for revealing the actual diameter of the grinding wheel before the facing and grooving cycle;
  • FIGS. 6 a , 6 b and 6 c show views similar to those of FIGS. 5 a , 5 b and 5 c when the grinding wheel is in contact with the diamond during the so-called “diamonding” or facing and grooving phase;
  • FIGS. 7 a , 7 b and 7 c show views similar to those of FIGS. 5 a , 5 b and 5 c which represent the phase in which the correct distance between the fixed part and movable part of the protection device is re-established to ensure the safety requirements described above.
  • these illustrate a protection device for a rotating grinding wheel made of abrasive material produced according to the invention.
  • the protection device comprises a containment structure comprising a fixed portion 11 with respect to the rotation axis of the grinding wheel assembled on the grinding machine and a movable portion 12 .
  • the movable portion 12 is assembled on a pair of scraping guides 13 , having a low friction coefficient, positioned on opposite sides with respect to the grinding wheel.
  • the fixed portion 11 comprises, constrained to it for example by means of hinges 14 , a covering and protection element 15 of the containment structure of a grinding wheel 16 .
  • a motor or driving device for example a pneumatic cylinder 17 , and a stem 18 with which, at its free end, it is hinged to the movable portion 12 , is constrained to the fixed portion 11 of the containment structure.
  • An electromagnetic blocking unit 19 of the movable part 12 with respect to the fixed part 11 is alsoprovided.
  • a blocking element 20 acts as a safety device for the movement of the movable portion 12 with respect to the fixed portion 11 .
  • This element can, for example, be a stem-block, which comprises a suitable valve which, when fed with pressurized air, prevents the cylinder from effecting movements due, for example, to the residual compressed air inside the cylinder.
  • the motor 17 is also equipped with a sensor 26 suitable for automatically identifying the position of the movable portion 12 corresponding to a new grinding wheel.
  • a nozzle 23 for the emission of cooling and lubricating liquid between the grinding wheel 16 and piece under processing.
  • a sensor 25 for revealing the diameter of the grinding wheel before the diamonding a “diamonding” or facing and grooving unit 29 and, finally, a mechanical buffer 24 on which the movable part 12 rests during the automatic positioning cycle of the movable part 12 with respect to the fixed part 11 .
  • These elements 25 , 24 and 29 are in front of the movable portion 12 and near the operating opening 22 when the grinding wheel-holder trolley positions the grinding wheel itself in correspondence with the piece-holder head.
  • the grinding wheel-holder trolley is brought to a “grinding wheel substitution” position, the advance axis X of the grinding wheel is then withdrawn completely, the electromagnetic brake 19 is unblocked, the cylinder 17 is activated by means of the control unit 27 to move the movable portion 12 away from the fixed portion 11 to allow the grinding wheel 16 to be inserted. In this phase the cylinder goes to the run-end. All the above operations, except for the opening of the covering element 15 , can be effected sequentially or automatically, once the specific grinding wheel substitution procedure has been activated on the control unit 27 .
  • the covering element 15 is closed and firmly fixed by means of the knobs 21 or another equivalent blocking device.
  • the movable portion 12 is brought back onto the fixed portion 11 until the sensor 26 identifies the correct starting operative position on the basis of the maximum value of the diameter of the grinding wheel 16 used.
  • the cylinder 17 is then stopped and the electromagnetic blockage unit 19 is activated ( FIG. 1 ).
  • the operating cycle initiates with the intervention of the grinding wheel 16 for example on a cylinder to be ground (not shown).
  • the diameter of the grinding wheel 16 is controlled by control means of the whole grinding machine consisting of a CNC system, schematized in 27 , and when there is a wear of 2-3 mm, a warning/alarm is visualized on a display 28 asking the operator to effect a procedure for reestablishing the safety distance between the movable portion 12 and the fixed portion 11 as soon as possible, i.e. at the end of the grinding cycle underway.
  • the regulation of the movable part 12 with respect to the fixed part 11 can, for example, be effected by means of an automatic cycle managed by the control system 27 after requesting the operator, and is composed of the following phases:
  • the grinding machine positions the grinding wheel-holder trolley so that the grinding wheel is in correspondence with the sensor 25 situated onboard the piece-holder head.
  • the advancement axis X of the grinding wheel moves the grinding wheel itself towards the sensor.
  • the control system 27 on the basis of the position of the advancement axis X of the grinding wheel and original diameter of the new grinding wheel, calculates the present diameter.
  • the grinding wheel-holder trolley is positioned so that the grinding wheel is in correspondence with the facing and grooving unit 29 situated onboard the piece-holder head and the facing and grooving is effected automatically.
  • the control system 27 automatically calculates the decrease in the diameter of the grinding wheel in relation to the increase in the advance axis X of the grinding wheel. c) Finally, the grinding wheel is positioned so as to put the movable part 12 in correspondence with the reference 24 situated onboard the piece-holder head until it touches it. The brake 19 is unblocked and the advance axis X of the grinding wheel advances until the movable part 12 touches the reference 24 .
  • the control system 27 activates the advance axis X of the grinding wheel which “pushes” the movable part 12 which, as it is not braked and the piston 17 is not charged, moves towards the fixed part 11 positioning the movable part 12 at the desired distance from the grinding wheel.
  • the run of the advance axis X of the grinding wheel necessary for effecting this operation is calculated automatically by the control system 27 .
  • the magnetic blocking unit 19 is activated.
  • the operating cycle initiates with the intervention of the grinding wheel 16 . It can therefore be understood how the correct position of the protection device is imparted giving the operator more protection in the case of explosion of the grinding wheel and preventing the operator from having any contact with fragments made of abrasive material.
  • the safety of always operating at the correct distance between the grinding wheel 16 and containment structure 11 , 12 provides greater control on the emission of the cooling liquid onto the grinding wheel 16 and onto the piece, minimizing the jets outside the machine and preventing damages to the operator's health.
  • the invention can be indifferently applied to hoods with both a sliding and rotating cover.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
  • Braking Arrangements (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
US13/810,449 2010-08-02 2011-06-29 Automatically adjustable protection device for a grinding wheel Abandoned US20130130603A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ITMI2010A001458A IT1401503B1 (it) 2010-08-02 2010-08-02 Dispositivo di protezione per una mola a disco
ITMI2010A001458 2010-08-02
PCT/EP2011/003190 WO2012016611A1 (fr) 2010-08-02 2011-06-29 Dispositif de protection à réglage automatique pour meule

Publications (1)

Publication Number Publication Date
US20130130603A1 true US20130130603A1 (en) 2013-05-23

Family

ID=43739489

Family Applications (1)

Application Number Title Priority Date Filing Date
US13/810,449 Abandoned US20130130603A1 (en) 2010-08-02 2011-06-29 Automatically adjustable protection device for a grinding wheel

Country Status (9)

Country Link
US (1) US20130130603A1 (fr)
EP (1) EP2601013A1 (fr)
JP (1) JP2013535347A (fr)
KR (1) KR20130094296A (fr)
CN (1) CN103052469A (fr)
CA (1) CA2805169A1 (fr)
IT (1) IT1401503B1 (fr)
RU (1) RU2013102136A (fr)
WO (1) WO2012016611A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130280993A1 (en) * 2010-12-24 2013-10-24 Komatsu Ntc Ltd. Scattering prevention structure of grinding machine
CN105312989A (zh) * 2015-11-30 2016-02-10 周建绿 一种具有限位功能的建筑钢筋打磨装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2613160A1 (de) * 1976-03-27 1977-10-06 Karstens Georg Messgeraete Schutzvorrichtung fuer schleifmaschinen
US5111625A (en) * 1990-06-01 1992-05-12 Diskus Werke Frankfurt Am Main Aktiengesellschaft Machine for contour grinding outside peripheral surfaces of workpieces
US5396122A (en) * 1991-02-26 1995-03-07 Elge Elektronik-Geratewerk Gmbh & Co. Door or protective hood locking control system as a safety device for machines

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD227076A1 (de) * 1984-09-26 1985-09-11 Werkzeugmaschinenbau Fz Einrichtung zum selbsttaetigen nachstellen des schutzschirms einer schleifscheibenschutzhaube
JPS61188077A (ja) * 1985-02-14 1986-08-21 Alps Electric Co Ltd ツル−イング装置
JP2566245B2 (ja) * 1987-07-09 1996-12-25 豊田工機株式会社 砥石前カバ−補正装置
JPH0266928U (fr) * 1988-11-10 1990-05-21
JPH0671056U (ja) * 1993-03-19 1994-10-04 フジオーゼックス株式会社 砥石車用カバー
US6636153B1 (en) * 2000-07-26 2003-10-21 Simon C. Barton Sensing system for magnetic clamping devices
JP2006068838A (ja) * 2004-08-31 2006-03-16 Toyoda Mach Works Ltd 砥石ガード装置
DE102006041671B4 (de) * 2006-09-06 2018-03-29 Robert Bosch Gmbh Schutzhaube einer Handwerkzeugmaschine
WO2008032333A1 (fr) * 2006-09-13 2008-03-20 Uttam Sarda Système de maintien de pièce électromagnétique permanent conçu pour fixer par serrage une ou plusieurs pièces ferromagnétiques et pour détecter simultanément un déplacement
JP3138361U (ja) * 2007-10-18 2007-12-27 株式会社丸仲鉄工所 刃物研磨装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2613160A1 (de) * 1976-03-27 1977-10-06 Karstens Georg Messgeraete Schutzvorrichtung fuer schleifmaschinen
US5111625A (en) * 1990-06-01 1992-05-12 Diskus Werke Frankfurt Am Main Aktiengesellschaft Machine for contour grinding outside peripheral surfaces of workpieces
US5396122A (en) * 1991-02-26 1995-03-07 Elge Elektronik-Geratewerk Gmbh & Co. Door or protective hood locking control system as a safety device for machines

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Engl Translation of DE 2613160 *
English Translation of DD 00227076 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130280993A1 (en) * 2010-12-24 2013-10-24 Komatsu Ntc Ltd. Scattering prevention structure of grinding machine
US8777700B2 (en) * 2010-12-24 2014-07-15 Komatsu Ntc Ltd. Scattering prevention structure of grinding machine
CN105312989A (zh) * 2015-11-30 2016-02-10 周建绿 一种具有限位功能的建筑钢筋打磨装置

Also Published As

Publication number Publication date
CN103052469A (zh) 2013-04-17
CA2805169A1 (fr) 2012-02-09
WO2012016611A8 (fr) 2012-08-16
ITMI20101458A1 (it) 2012-02-03
JP2013535347A (ja) 2013-09-12
RU2013102136A (ru) 2014-09-10
EP2601013A1 (fr) 2013-06-12
KR20130094296A (ko) 2013-08-23
WO2012016611A1 (fr) 2012-02-09
IT1401503B1 (it) 2013-07-26

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Legal Events

Date Code Title Description
AS Assignment

Owner name: TENOVA S.P.A., ITALY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:ANDERSSON, THOMAS;GIUCOLSI, MASSIMILIANO;ANZINI, MATTEO;AND OTHERS;REEL/FRAME:029634/0769

Effective date: 20121123

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION