WO2019048274A1 - TRANSPORT APPARATUS AND METHOD FOR THE OPERATION THEREOF - Google Patents

Abstract

The invention relates to a transport device for material to be tempered (4) in an oven comprising a plurality of furnace rollers (1, 2) characterized in that at least a part of the furnace rollers have a about the rotation axis (3) eccentric cross section (2) that a part of Circumference of the eccentric cross section has a relation to a standard furnace roller (1) smaller radius, and that at least the furnace rollers with eccentric cross section (2) are driven synchronously by at least one drive unit. Furthermore, the invention relates to a method for their operation.

Description

 Transport device and method for its operation Technical field

In the field of transport of flat, to be heated or tempered material in ovens, transport devices are needed in industrial applications.

Technical Background (Background Art)

Rolling of adjacent round rollers are known from the state of the art for flat materials, such as tapes, sheets or blanks. These define a pass line for the material to be tempered, which runs along a plane defined by the tops of the rolls. At least a portion of the rollers is driven to convey the product along the roller conveyor.

From DE 33 Ol 660 AI roller geometries with circumferentially distributed increases are known for ceramic plates.

The known from the prior art, roller assembly is common that during transport, a relative movement, such as slippage or the like, occurs and there may be mechanical damage to the underside of the conveyed Guts.

Summary of Invention

The invention is thus based on the object to provide a transport device with which a gentle transport of the material to be tempered is made possible. Other objects of the invention are a cost-effective design and a good retrofit availability of existing systems and flexible applications.

This object is achieved by transport devices according to claim 1 and methods for their operation according to claims 10 and 12.

According to the invention, a transport device for material to be tempered in a furnace comprising a plurality of furnace rollers, which is characterized in that at least a portion of the furnace rollers have an eccentric about the axis of rotation cross-section that a portion of the circumference of the eccentric cross-section compared to a standard oven roll smaller Has radius, and that at least the eccentrically formed furnace rollers are driven synchronously by at least one drive unit. Standard furnace roll here refers to a furnace roll having a round cross-section, the axis of rotation is coaxial with the axis of the roll, as is known in the prior art. In embodiments of the invention, furnace rolls of eccentric cross-section according to the invention are arranged between such standard furnace rolls. There are further embodiments of the invention are possible in which only furnace rollers are provided with eccentric cross-section. The eccentric rollers have in this case in a partial region of the circumference to a radius which is smaller than the radius of a standard oven roll or would be in embodiments without standard oven roll. The radii are each measured from the axis of rotation of the respective role. This allows the eccentric section oven roll to be removed from the pass line defined along the top edges of the standard oven rolls, and the feedstock rests on the standard oven rolls. If the furnace roller with eccentric cross-section continues to rotate, it comes into contact with the underside of the material to be conveyed and tempered and raises it. During the further rotation of the raised material to be tempered is moved according to the geometry of the furnace roller with eccentric cross section in the direction of passage of the furnace and placed back on the standard furnace rollers. In order to ensure the rotation of the furnace rollers with eccentric cross section, at least one drive unit is provided. The drive unit or drive units are designed such that the furnace rollers are driven synchronously with eccentric cross section in order to avoid a relative movement between the furnace roller and the underside of the material. By lifting the material to be conveyed and tempered, the contact is improved and a relative movement through, for example, slippage, as occurs in the prior art is avoided. This training also has the advantages that it can be implemented relatively inexpensively and existing facilities can be retrofitted relatively easily or.

Further embodiments of a transport device according to the invention are characterized in that the cross section of the furnace rollers is formed by a plurality of support rings distributed over the width. Through the use of support rings, the contact surface of the furnace roller can be adjusted with the material to be tempered. Furthermore, this simplifies the production of the cross-sectional shape by reducing the size of the component and reduces the moving masses. Transport devices according to further embodiments of the invention are characterized in that alternately furnace rollers with eccentric cross section and standard furnace rollers are arranged. Due to the alternate arrangement of the standard furnace rollers and the furnace rollers with eccentric cross section, the span, so the distance between two adjacent contact surfaces with the material to be tempered, between similar furnace rollers, more precisely between the standard furnace rollers or between the furnace rollers with eccentric cross-section, as possible kept low. As a result, the forces and thus the loads and resulting, possible damage to the bottom of the estate are minimized.

In further embodiments, transport devices according to the invention, characterized in that in furnace rollers with eccentric cross-section, an expansion joint in the region of the circumference is arranged with a smaller radius. Due to the use in ovens, it may be necessary to provide expansion joints along the circumference to avoid stresses in the oven rolls. These are edges that can damage the underside of the material to be conveyed and tempered. The advantage in this embodiment is that the expansion joint is provided in the area with respect to the standard furnace rolls smaller radius and thus does not come into contact with the good, since the good rests on the adjacent standard oven rolls.

Embodiments of a transport device according to the invention are characterized in that the eccentric cross section is formed by eccentrically arranged round rings or rollers. A simple construction of the furnace rollers with eccentric cross section can be achieved by using rollers or support rings with a round cross section, in which the axis of rotation does not coincide with the axis of symmetry, that is, the axis passing through the center, but is displaced parallel thereto.

Further embodiments of a transport device according to the invention are characterized in that the eccentric cross section is formed by a symmetrical, preferably about an axis of symmetry symmetrical axis, profile, wherein the axis of rotation is not through the center of gravity of the eccentric cross section, and wherein the radius is about the circumference of the eccentric cross section, preferably continuously, changes. Notwithstanding a circular cross-section can be used for the furnace rollers with eccentric cross section and profiles or support rings whose scope runs arbitrarily. For example, at least partially elliptical cross-sections, or even round profiles, with a radius greater than the radius of the standard furnace rolls, and in which a circle segment is removed, with a segment height which is greater than the difference of the radii, can be used , Sharp-edged profiles, on the other hand, should be avoided to prevent damage to the underside of the product, rounded edges are preferable. The profile of the radius of the outer contour measured from the axis of rotation preferably changes continuously in order to largely avoid jumps which represent edges. Furthermore, profiles with an axisymmetric shape are preferred in order to achieve the most uniform movement of the material to be tempered during lifting and dropping.

Further embodiments of a transport device according to the invention are characterized in that the eccentric cross section is formed by a contact body with a contact surface which is provided for contacting with the material to be tempered, which is arranged at least one lever spaced from the axis of rotation. The contact body and the lever can in this case consist of one or several components. One-piece designs have the advantage of a smaller number of parts and associated lower installation costs. In multi-part designs there is greater flexibility with respect to a change in the shape and size of the contact surface of the contact body. Embodiments are also possible in which two or more levers distributed over the circumference are provided, wherein the common width of all levers in a plane perpendicular to the axis of rotation may not be greater than the diameter of a standard oven roll, thus the eccentric cross section at corresponding rotational positions can be removed from the pass line. In these cases, the axis of rotation can pass through the center of gravity of the eccentric cross section.

Preferred embodiments of the transport device are characterized in that the contact body is movably connected to the lever. In addition to the aforementioned advantages of a multi-part design, a movable connection offers increased flexibility with regard to the contact body or its contact surface. Due to the movable arrangement, the surface, with which the contact surface comes into contact with the underside of the Guts, be made larger, since their orientation is independent of the rotational position of the furnace roller with eccentric cross-section. In this way, the support surface of the bottom of the Guts can be set larger with the contact body, which is the burden, in particular the surface pressure, and thus damage to the underside of the Guts can reduce. For example, the contact surface can be made flat or with a very large curvature, which leads to a constant contact surface during the lifting, further transport and depositing of the material to be tempered. When determining the size of the contact surface, in addition to the properties mentioned, if appropriate, heat removal by cooled furnace rolls may additionally be taken into account.

In further preferred embodiments, transport devices according to the invention are characterized in that the movable connection of lever and contact body between the center of gravity of the contact body and the contact surface and / or in the direction of rotation of the furnace roller is provided after the center of gravity of the contact body. The arrangement of the movable connection between the center of gravity and the contact surface can ensure that the contact body is always aligned with the contact surface upwards. As a result, the application of the contact surface is ensured to the underside of the Guts and achieved as gentle as possible contact. Alternatively or additionally, the movable connection can be arranged in the direction of rotation according to the center of gravity of the contact body, that is to say between the center of gravity and the edge of the contact body following in the conveying direction. This ensures that the front edge in the direction of rotation of the contact body is inclined downwards before contacting with the underside of the Guts, whereby tilting of the contact body is avoided with the underside of the Guts, which avoids corresponding damage to the underside of the Guts. In addition, a stop can be provided on the lever and / or contact body, which limits the pivoting range of the contact body relative to the lever, for example, to avoid swinging or excessive oscillation or to limit the movement of the contact body over a portion outside the pass line. The stop may in this case also be designed as a combination of stationary, ie not co-rotating, cam and a corresponding associated with the contact body guide to define the position of the contact body during the circulation.

Inventive methods for operating a transport device according to the above-mentioned embodiments are characterized in that the furnace rollers are rotated by eccentric cross section through the at least one drive unit, whereby the material to be tempered lifted from the standard furnace rollers to one of the geometry of the furnace roller with eccentric Cross-section dependent distance conveyed in the direction of flow and put back on the standard oven rolls. As already to the transport device explains, a gentle transport method is achieved in which damage to the bottom of the Guts over the prior art are significantly reduced.

In preferred embodiments, the method is characterized in that the standard furnace rollers are released so that they can rotate freely to avoid damage due to relative movements due to inertial forces.

Alternative methods for operating a transport device according to the above embodiments are characterized in that the eccentric cross-section oven rollers are turned up or released with their radius smaller than the standard oven rollers, whereby the eccentric section oven rollers are removed from the pass line of the material to be tempered and that the standard oven rolls are driven. Inventive transport devices can also be operated in a conventional manner with the standard furnace rollers, which increases the flexibility of the system. For this purpose, the furnace rollers are switched off with eccentric cross-section, whereby they pivot due to gravity from the pass line with respect to the standard oven roll smaller radius upwards. Alternatively, or to ensure this, for example, even with symmetrical furnace rollers with eccentric cross-section, the alignment of the relative to the standard furnace roll smaller radius can be done upwards by the drive unit.

Transport devices according to the invention are operated by a method according to the invention in the tunnel kiln of a CSP plant (Compact Strip Production). Also, the use in other furnaces in a continuous process is possible.

Short description of the drawings (Brief Description of Drawings)

In the following the invention will be explained in more detail with reference to schematic drawings, wherein like parts are provided with the same reference numerals. In detail show:

1a, 1b, 1c, a schematic representation of a transport device according to the invention with a material to be tempered in various process steps,

2 is a schematic representation of a furnace roller with an eccentric cross section in a first embodiment, 3 is a schematic representation of a furnace roller with an eccentric cross section in a second embodiment,

Fig. 4 is a schematic representation of a furnace roller with an eccentric cross section in a third embodiment and

5 is a schematic representation of an embodiment of a contact body according to a third embodiment of FIG .. 4

Description of the Preferred Embodiments (Best Mode for Carrying Out the Invention)

1a, 1b and 1c show a schematic embodiment of a transport device according to the invention in various stages of a method according to the invention. The figures have in common that the transport device consists of alternately arranged standard furnace rollers (1) and furnace rollers with eccentric cross-section (2). Each roller (1, 2) in this case has an axis of rotation (3) which lie on a same plane and about which the rollers (1, 2) are each rotatable. The drive unit is not shown.

The initial situation is shown in Fig. La that to be conveyed and tempered Good (4) rests on a part of the standard furnace rollers (1). The furnace rollers with eccentric cross-section (2) are aligned with their relation to the standard furnace rollers (1) smaller radius upwards, so they do not touch the bottom of the Guts (4).

Fig. 1b schematically illustrates the state in which the eccentric section oven rolls (2) have been rotated through 180 °, rotated clockwise in the example shown. The material (4) now lies on the furnace rollers with eccentric cross-section (2) and is not touched by the standard furnace rollers (1). Opposite the starting position (5) of the Guts (4), the good (4) is raised and already in the conveying direction T, in the example shown to the right, further transported.

By further rotation of the furnace rollers with eccentric cross section (2), the material to be tempered (4) is again placed on the standard furnace rollers (1). Fig. Lc represents the state after a full revolution of the furnace rollers with eccentric cross-section (1). Die Rollers (1, 2) again have the same position as in FIG. 1a. The material to be tempered Good (4) has been transported to the starting position (5) in the conveying direction T and is again on the standard furnace rollers (1) and is not touched by the furnace rollers with eccentric cross-section (2).

The embodiment shown in Fig. 2 a furnace roller with eccentric cross section (2) also corresponds to the embodiment shown in Fig. La, lb and lc. Here, a roller or support rings is used with a circular cross section, wherein the axis of rotation (3) relative to the center of gravity or center (6) of the cross section is shifted. Thus, measured from the axis of rotation (3), different radii along the circumference, resulting in the eccentric structure result.

Another schematic embodiment of a furnace roller with eccentric cross section

(2) is shown in FIG. Here, the furnace roller with eccentric cross section (2) is formed from an elliptical profile or correspondingly shaped support rings, which are arranged eccentrically around the axis of rotation (3). As a result of the illustrated elliptical shape, the larger radius of the contact surface increases the contact surface, for example with respect to an embodiment with a circular profile shown in FIG. 2. The elliptical profile can also be seen as a contact body (8), which is integral with a lever (7) with the axis of rotation

(3) is connected.

Fig. 4 shows another schematic embodiment of a furnace roller with eccentric cross section (2). In this case, a lever (7) with the rotation axis (3) is connected. At the end remote from the axis of rotation (3), the lever (7) is connected to the contact body (8) via a movable connection (10). The contact body (8) has a contact surface (9) which comes into contact with the underside of the item (4).

In Fig. 5, a possible embodiment of a contact body (8) according to an embodiment of the invention shown in Fig. 4 is shown. The contact body (8) has a curved contact surface (9) on its upper side facing the temperature to be tempered. The contact body (8) has a center of gravity (6) for the cross-section, which coincides in the case of homogeneous bodies with the center of area. The movable connection (10) with the lever (7), not shown here, is arranged between the center of gravity (6) and the contact surface (9). Due to gravity, the center of gravity is below, with free rotation the movable connection (10), whereby it is ensured that the contact surface (9) is oriented upwards to the tempering material (4). In the example shown, the movable connection (10) is arranged in the direction of rotation of the oven roll or in the conveying direction T after the center of gravity (6), ie between the center of gravity (6) and the edge of the contact body (8) following in the conveying direction T. As a result, it is ensured with free rotation by gravity that the front edge of the contact body (8) is inclined downwards. Thus, a tilting of the front edge with the Good (4) can be avoided. In the illustrated embodiment, the movable connection (10) relative to the center of gravity (6) is displaced both in the direction of the contact surface (9) and in the direction of the following in the conveying direction T edge. These measures can also be used independently.

The various features of the invention can be combined with one another as desired and are not limited to the described or illustrated examples of embodiments.

LIST OF REFERENCE NUMBERS

1 standard oven roll

 2 oven roller with eccentric cross-section

3 rotation axis

 4 good

 5 Starting position of the item

 6 Focus / Center

 7 lever

 8 contact bodies

 9 contact surface

 10 Mobile connection

T conveying direction

Claims

claims l. Transport device for material to be tempered (4) in a furnace comprising a plurality of furnace rollers (1, 2), characterized in that at least a part of the furnace rollers around the axis of rotation (3) eccentric cross-section (2) that part of the circumference of the eccentric cross section a relative to a standard oven roll (1) has smaller radius, and that at least the furnace rollers with eccentric cross section (2) are driven synchronously by at least one drive unit. 2. Transport device according to claim 1, characterized in that the cross section of the furnace rollers (1, 2) is formed by a plurality of support rings distributed over the width. 3. Transport device according to claim 1 or 2, characterized in that alternately furnace rollers with eccentric cross section (2) and standard furnace rollers (1) are arranged. 4. Transport device according to one of claims 1 to 3, characterized in that in furnace rollers with eccentric cross section (2) an expansion joint in the region of the circumference is arranged with a smaller radius. 5. Transport device according to one of claims 1 to 4, characterized in that the eccentric cross section is formed by eccentrically arranged round rings or rollers. 6. Transport device according to one of claims 1 to 4, characterized in that the eccentric cross section is formed by a symmetrical, preferably about an axis of rotation (3) symmetrical axis, profile, wherein the The axis of rotation (3) does not pass through the center of gravity (6) of the eccentric cross section, and wherein the radius changes over the circumference of the eccentric cross section, preferably continuously. 7. Transport device according to one of claims 1 to 3, characterized in that the eccentric cross section is formed by a contact body (8) with a contact surface (9) which is provided for contacting with the material to be tempered (4) is arranged at a distance from the axis of rotation (3) via at least one lever (7). 8. Transport device according to claim 7, characterized in that the contact body (8) with the lever (7) is movably connected. 9. Transport device according to claim 8, characterized in that the movable connection (10) of the lever (7) and contact body (8) between the center of gravity (6) of the contact body (8) and the contact surface (9) and / or in the direction of rotation of Furnace roll according to the center of gravity (6) of the contact body (8) is provided. 10. A method for operating a transport device according to one of claims 1 to 9, characterized in that the furnace rollers with eccentric cross section (2) are rotated by the at least one drive unit, whereby the tempered Good (4) of the standard furnace rollers (1 ) lifted to one of the geometry of the furnace roller with eccentric cross-section (2) dependent distance conveyed in the direction of passage and placed back on the standard furnace rollers (1). 11. The method according to claim 10, characterized in that the standard furnace rollers (1) are released so that they can rotate freely to avoid damage from relative movements due to inertial forces. 12. A method for operating a transport device according to one of claims 1 to 9, characterized in that the furnace rollers with eccentric cross section (2) with their compared to the standard furnace rollers (1) smaller radii are turned up or unlocked, whereby the furnace rollers with eccentric cross section (2) are removed from the pass line of the material to be tempered (4), and that the standard furnace rollers (1) are driven. 13. Use of a transport device according to one of claims 1 to 9 operated by a method according to one of claims 10 to 12 in the tunnel kiln of a CSP plant (Compact Strip Production).