EP3965954B1 - Workpiece drive and descaling device having a workpiece drive - Google Patents

Description

On the one hand, the invention relates to a workpiece drive for rotating a circular workpiece in a descaling device. The workpiece drive has a carrier.

On the other hand, the invention relates to a descaling device for a circular workpiece. The descaling device has a housing, such a workpiece drive and a first descaler. The first descaler is located in the housing. Furthermore, the housing is designed to hold a circular workpiece on the workpiece drive.

In any case, a circular workpiece has a first end face, a second end face, an outer lateral surface and a circular outer contour, it being possible for the workpiece to be placed on the circular outer contour. The circular outer contour is a line of intersection between the outer lateral surface and the first end face. A circular workpiece often also has an inner lateral surface. The surfaces are covered with scale and the temperature is usually so high that it glows. The high temperature is required for further processing of the workpiece. Circular workpieces have a mass of a few kilograms to a few tons. In particular, these are cylindrical and rotationally symmetrical workpieces such as rings, wheel tires and discs.

The CN 201 186 303 Y describes a machine for descaling the outside and inside surfaces of the walls of tubes. A tube is placed on two rollers and rotated by them. The CN 102 764 778 B describes a system for removing scale from the outside and inside surfaces of the walls of large diameter metal pipes. The system includes a drive for helical movement of the wall of a metal pipe. The EP 2 561 960 A1 describes an apparatus for grit blasting an inner wall of a substantially cylindrical object. The device has a frame in which a rotatable table is arranged. The table has means for mounting such a substantially cylindrical object.

A workpiece drive known from the prior art has a turntable with an axis of rotation. The turntable is arranged on the carrier and has a drive for rotating the turntable. A circular workpiece with an inner lateral surface is placed with the first end face on the turntable. The workpiece drive usually has a guide so that the circular workpiece placed on the turntable is concentric to the axis of rotation. The guide is, for example, a mandrel that is arranged on the turntable concentrically to the axis of rotation. This mandrel centers the workpiece when the workpiece is placed on the turntable in relation to the axis of rotation by guiding the inner surface.

In a descaling device known from the prior art with such a workpiece drive, the workpiece drive rotates the turntable with a hot workpiece, while the first descaler descales a surface of the workpiece. Descaling a hot workpiece is usually done with water under high pressure, which is blasted onto the workpiece. Essentially, the scale on the workpiece is knocked off the surface and washed away by the momentum of the impacting water. Only free surfaces of the workpiece can be descaled. The housing encloses the workpiece, the first descaler and the turntable, so that the water and the chipped scale do not pose any danger to the surroundings of the descaling device and at least a substantial part of the liquid water and the scale does not escape from the housing.

Since the workpiece sits on the turntable with the first end face and the guide usually covers another surface of the workpiece, the workpiece must be moved at least once to descale all surfaces. Concealed surfaces, such as the first face covered by the turntable, are not accessible to descalers. Accordingly, not all surfaces of a workpiece, ie the first and second end face, the inner lateral surface and the outer lateral surface, can be descaled in a single work step, since a work step is ended by repositioning.

Relocating a workpiece in the descaling device requires a suitable relocating device on the one hand and costs time on the other. Developing and manufacturing a transfer device takes time and money. In addition, the workpiece continues to cool down during the time it takes to move it. Cooling of the workpiece is undesirable, as only one is sufficient hot workpiece can be processed. In addition, the workpiece is also cooled down by sitting on the turntable.

The object of the present invention is to overcome or at least mitigate the disadvantages presented.

The task is solved by a workpiece drive according to patent claim 1 . This workpiece drive has at least three support roller modules. Each of the support roller modules has a bearing and a support roller for a circular workpiece. The support roller has a longitudinal axis, a lateral surface and a radius between the longitudinal axis and the lateral surface. The radius decreases in a longitudinal direction along the longitudinal axis. The bearing mounts the support roller so that it can rotate about the longitudinal axis. Each of the support roller modules has a drive and the drive is designed to rotate the support roller about the longitudinal axis.

The bearings are arranged on the carrier in such a way that the longitudinal axes have an intersection point, so that the longitudinal directions are directed towards the intersection point and so that the lateral surfaces form a conical receptacle with a receptacle axis for a workpiece placed on the support rollers, with the receptacle axis being essentially parallel to the Earth's gravity field vector is aligned.

The workpiece drive is designed to place a circular workpiece on the at least three support rollers. Each of the drives has a motor for rotating the support rollers. The drives are designed to rotate the support rollers at the same speed in the same direction.

The conical receptacle, which is formed by the lateral surfaces of the support rollers for a workpiece placed on the support rollers, is a geometric surface which is determined by the lateral surfaces of the support rollers. The area has a center point and rises outwards, ie against the longitudinal direction, against the earth's gravitational field vector. The shape of the lateral surfaces of the support rollers in connection with the orientation and arrangement of the support rollers relative to one another initially means that a circular workpiece placed on the support rollers is only in contact with the support rollers with its circular outer contour. Thus, a contact area between a circular workpiece and the workpiece drive is reduced compared to the prior art, which also reduces the cooling of the workpiece. Next is caused to move the workpiece when it is eccentric to a point passing through the intersection and parallel has been placed on the centering axis standing to the earth's gravitational field vector, is centered on the centering axis when rotating by the rotating support rollers, so that it finally rotates concentrically around the centering axis. A guide as in the prior art is therefore no longer required. The center of the cone-shaped mount is usually on the centering axis.

In one embodiment of the workpiece drive, it is provided that a receptacle opening angle of the conical receptacle is greater than 160° and smaller than 180°.

The task is also solved by a workpiece drive according to patent claim 3 . This workpiece drive has at least three support roller modules. Each of the support roller modules has a bearing and a support roller for a circular workpiece. The support roller has a longitudinal axis, a lateral surface and a radius between the longitudinal axis and the lateral surface. The radius decreases in a longitudinal direction along the longitudinal axis. The bearing supports the support roller so that it can rotate around the longitudinal axis. Each of the support roller modules has a drive and the drive is designed to rotate the support roller about the longitudinal axis.

The bearings are arranged on the carrier in such a way that the longitudinal axes have an intersection and lie in a plane perpendicular to the earth's gravitational field vector and so that the longitudinal directions are directed towards the intersection.

For the workpiece drive according to patent claim 3, the statements regarding the workpiece drive according to patent claim 1 apply accordingly.

Embodiments of the workpiece drives according to patent claims 1 and 3 are described below.

In one embodiment of the workpiece drive, it is provided that the bearings are arranged on the carrier in such a way that the longitudinal axes are radially symmetrical. Radial symmetry is given when angles between two adjacent longitudinal axes are equal. The radially symmetrical arrangement of the longitudinal axes causes a circular workpiece placed eccentrically on the support rollers to be centered with the lowest number of revolutions of the workpiece by the workpiece drive.

In a further embodiment it is provided that at least one of the lateral surfaces is conical. If the lateral surface of an idler is conical, then the idler is a right cone or truncated cone. The cone or truncated cone preferably has a cone opening angle greater than 0° and less than 60°. The cone opening angle is to be selected in such a way that the cone shape of the cone-shaped receptacle is retained. With very small cone opening angles in the range mentioned, the idlers are practically cylinders. In the case of a cone or truncated cone as a support roller, the radius in the longitudinal direction along the longitudinal axis decreases in proportion to a distance on the longitudinal axis. Cones or truncated cones are ideal as support rollers because they are easier to manufacture than other outer surfaces with radii that do not decrease proportionally to a distance on the longitudinal axis.

The bearing of a support roller module can be arranged on an inside and/or outside of the workpiece drive. The inside is on the side of the idler roller of the idler roller module on which the intersection of the longitudinal axes of the idler rollers lies, whereas the outside is on the other side of the idler roller.

In a further embodiment it is provided that at least one of the support roller modules is supported on only one side of the support roller in relation to the longitudinal axis. This one-sided support of a support roller either on the inside or outside means that the support roller is easier to remove and install than with a support on both sides. Since idlers wear out during use, the one-sided bearing reduces maintenance costs and downtimes.

In a development of the above embodiment, it is provided that the support roller is arranged between the bearing and the point of intersection. Thus, the bearing of the idler is on the outside. By locating the storage on the outside, the storage is more easily accessible than if it were on the inside. Thus, maintenance of the bearing is simplified. Preferably all bearings are on the outside. Because then the inside is free. The free inside allows free access to the inner lateral surface of a circular workpiece placed on the workpiece drive.

The object is also achieved by a descaling device according to patent claim 8 . This descaling device has one of those previously described workpiece drives. In addition to the first, it also has a second and third descaler. The first descaler is arranged on the carrier for irradiating the outer lateral surface, the second descaler is arranged on the carrier between two adjacent support rollers for irradiating the first end face and the third descaler is arranged on the carrier for irradiating the second end face with a liquid medium, preferably water. The support rollers, the first, second and third descaler are arranged in the housing, so that the medium and scale that has been cut off do not pose any danger to the surroundings of the descaling device and at least a significant part of the liquid medium and the scale does not escape from the housing.

A circular workpiece, which is exposed to the support rollers with its circular outer contour in the housing, is rotated around the centering axis by the workpiece drive during operation of the descaling device and, in comparison to the prior art, not only on one surface, but on at least three surfaces, namely the Outer jacket, the first end face and the second end face, irradiated with a medium under high pressure for descaling. In this way, not one surface but three surfaces are descaled in one work step. In contrast to the prior art, the workpiece drive allows in particular the arrangement of a descaler for descaling the first end face.

In one configuration of the descaling device, it is provided that the descaling device has a fourth descaling device, that the fourth descaling device is arranged on the carrier for irradiating the inner lateral surface with the medium. The four descaler washes enable descaling of all surfaces of a circular workpiece in just one single step. It is no longer necessary to move the workpiece in order to descale a hidden surface of the workpiece. Consequently, no transfer device is required and the time required for descaling is reduced compared to the prior art. The reduced time requirement leads to less cooling of the workpiece.

In a development of the above embodiment, it is provided that the fourth descaler is designed as a lance. The design of the fourth descaler as a lance enables the descaler to be easily moved in and out of the inner surface of a circular workpiece arranged on the support rollers in the housing. The possibility of the fourth Moving the descaler in and out of the inner surface makes it easier to place a circular workpiece on the support rollers and remove it.

In a particularly preferred embodiment it is provided that the bearings of the support roller modules are on the outside. The inside is then free, which means that access to the inner lateral surface of a circular workpiece is also free. In this configuration, the use of a fourth descaler designed as a lance is also possible, since it can be moved unhindered through the inner lateral surface.

Fig. 1

ein Ausführungsbeispiel einer Entzunderungsvorrichtung in einer Ansicht mit Gehäuse mit einem ersten Ausführungsbeispiel eines Werkstückantriebs,

Fig. 2

das Ausführungsbeispiel in Ansicht ohne Gehäuse,

Fig. 3

das Ausführungsbeispiel in einer geschnittenen Vorderansicht,

Fig. 4

das Ausführungsbeispiel in einer Aufsicht,

Fig. 5

eine Tragrolle des Ausführungsbeispiels,

Fig. 6

ein Ausführungsbeispiel eines kreisrunden Werkstücks,

Fig. 7

eine geschnittene Vorderansicht des Werkstückantriebs,

Fig. 8

eine kegelförmige Aufnahme des Werkstückantriebs und

Fig. 9

eine geschnittene Vorderansicht eines zweiten Ausführungsbeispiels eines Werkstückantriebs.

In detail, there are a number of possibilities for designing and developing the workpiece drive and the descaling device. In this regard, reference is made both to the patent claims subordinate to the independent patent claims and to the following description of a preferred exemplary embodiment of a descaling device and of two exemplary embodiments of a workpiece drive. In the drawing shows

1

an embodiment of a descaling device in a view with housing with a first embodiment of a workpiece drive,

2

the embodiment in view without housing,

3

the embodiment in a sectional front view,

4

the embodiment in a top view,

figure 5

a support roller of the embodiment,

6

an embodiment of a circular workpiece,

7

a sectional front view of the workpiece drive,

8

a conical receptacle for the workpiece drive and

9

a sectional front view of a second embodiment of a workpiece drive.

Figures 1 to 5 show an embodiment of a descaling device 1 for circular workpieces. It has a housing 2, a first exemplary embodiment of a workpiece drive 3 for rotating a circular workpiece, a first descaler 4, a second descaler 5, a third descaler 6 and a fourth descaler 7 on. The fourth descaler 7 is designed as a lance.

The workpiece drive 3 has a carrier 8 and three support roller modules 9 . Each of the support roller modules 9 has a bearing 10 and a support roller 11 for a circular workpiece. The idler roller 11 has a longitudinal axis 12 , a lateral surface 13 and a radius 14 between the longitudinal axis 12 and the lateral surface 13 . The radius 14 decreases in a longitudinal direction 15 along the longitudinal axis 12 . The lateral surface 13 of the support roller 11 is conical, which is why the support roller 11 is a truncated cone. Consequently, the radius 14 in the longitudinal direction 15 along the longitudinal axis 12 decreases in proportion to a distance along the longitudinal axis 12 . A cone opening angle 30 of the support rollers 11 is 15°. Truncated cones as support rollers 11 are advantageous because they are easy to manufacture. The bearing 10 supports the support roller 11 so that it can rotate about the longitudinal axis 12 . Each of the support roller modules 9 has a drive 16 with a motor 17 and the drive 16 is designed to rotate the support roller 11 about the longitudinal axis 12 . The drives 16 are designed to rotate the support rollers 11 at the same speed in the same direction. The bearings 9 are arranged on the carrier 8 such that the longitudinal axes 12 have an intersection 18, lie in a plane 19 perpendicular to the earth's gravitational field vector g and are radially symmetrical and so that the longitudinal directions 15 are directed towards the intersection 18.

The bearings 10 are arranged only on one side of the support rollers 11 with respect to the longitudinal axes 12, namely the support rollers 11 are arranged between the bearings 10 and the point of intersection 18. Thus, the bearings 10 are on the outside and not on the inside. The inside is on the side of the support rollers 11 on which the point of intersection 18 of the longitudinal axes 12 lies, whereas the outside is on the other side of the support rollers 11 . The only one-sided bearings 10 of the support rollers 11 on the outside mean that the support rollers 11 are easy to remove and install. Since support rollers 11 wear out during use, maintenance costs and downtimes are reduced by the one-sided bearings 10 . By locating the bearings 10 on the outside, the bearings 10 are more easily accessible than if they were on the inside. Thus, maintenance of the bearings 10 is simplified.

6 shows a circular workpiece 20 in the form of a rotationally symmetrical workpiece for the workpiece drive 3 and for the descaling device 1. It has a first end face 21, a second end face 22, an outer lateral surface 23, an inner lateral surface 24 and a circular outer contour 25. The circular outer contour 25 is a cutting line between the outer lateral surface 23 and the first end face 21. The workpiece is glowing hot and all surfaces are covered with scale.

The shape of the lateral surfaces 13 of the support rollers 11 in conjunction with the orientation and arrangement of the support rollers 11 in relation to one another has the effect on the one hand that the red-hot circular workpiece 20 placed on the support rollers 11 and covered with scale on all surfaces only comes into contact with its circular outer contour 25 with the support rollers 11 is. Thus, a contact area between the circular workpiece 20 and the workpiece driver 3 is reduced compared to the prior art, whereby the cooling of the workpiece 20 is also reduced. On the other hand, if the workpiece 20 has previously been placed eccentrically to a centering axis 26 that runs through the intersection point 18 and is perpendicular to the plane 19, it is centered on the centering axis 26 when rotated by the rotating support rollers 11, so that it finally rotated concentrically about the centering axis 26 . The radially symmetrical arrangement of the longitudinal axes 12 causes the circular workpiece 20, which is placed eccentrically on the support rollers 11, to be centered with the lowest number of revolutions of the workpiece 20 by the workpiece drive 3.

The first descaler 4 is on the carrier 8 for irradiating the outer lateral surface 23, the second descaler 5 on the carrier 8 between two adjacent support rollers 11 for irradiating the first end face 21, the third descaler 6 on the carrier 8 for irradiating the second end face 22 and the fourth descaler 7 arranged on the carrier 8 for irradiating the inner lateral surface 24 with water under high pressure. The four descalers 4, 5, 6, 7 allow descaling of all surfaces 21, 22, 23, 24 of the circular workpiece 20 in just a single step. It is no longer necessary to move the workpiece 20, which means that the time required for descaling is reduced compared to the prior art. The reduced time requirement leads to less cooling of the workpiece.

The support rollers 11 and the four descalers 4, 5, 6, 7 are arranged in the housing 2, so that the water and scale that has been cut off do not pose any danger to the surroundings of the descaling device 1 and at least a significant part of the water and scale does not get out of the housing 2.

The design of the fourth descaler 7 as a lance enables the fourth descaler 7 to be easily moved in and out of the inner lateral surface 24 of the circular workpiece 20 arranged on the support rollers 11 in the housing 2. The possibility of inserting the fourth descaler 7 into the inner lateral surface 24 and extend facilitates the placement of the circular workpiece 20 on the support rollers 11 and the removal of this.

7 shows the workpiece drive 3 in a sectional front view. Two of the three support rollers 11 and a workpiece 20 placed on the support rollers 11 are visible in this figure. The workpiece 20 touches the lateral surfaces 13 of the support rollers 11 with the outer contour 25. The longitudinal axes 12 have the point of intersection 18 and the longitudinal directions 15 are directed towards the point of intersection 18. The longitudinal axes 12 lie in the plane 19. The radii 14 decrease in the longitudinal directions 15 along the longitudinal axes 12. A conical receptacle 27 with a receptacle axis 28 is formed by the lateral surfaces 13 for the workpiece 20. The conical receptacle 27 is a geometric surface 31, which is determined by the lateral surfaces 13 of the support rollers 11. The surface 31 has a center point 32 and rises outwards, ie counter to the longitudinal directions 15, counter to the earth's gravitational field vector g. The recording axis 28 is essentially parallel to the earth's gravitational field vector g. Usually, as is the case here, the receiving axis 28 coincides with the centering axis 26 .

8 shows the conical receptacle 27 in a perspective view obliquely from above. The recording opening angle is 170° and is exaggerated for better clarity.

9 shows a second exemplary embodiment of a workpiece drive 3 of the descaling device 1 for circular workpieces 20 in a sectional front view. Apart from the following explanations, the explanations relating to the first embodiment also apply correspondingly to the second exemplary embodiment. In 9 two of the three support rollers 11 and a workpiece 20 placed on the support rollers 11 are visible. The workpiece 20 touches the lateral surfaces 13 of the support rollers 11 with the outer contour 25. The longitudinal axes 12 have the point of intersection 18 and the longitudinal directions 15 are directed towards the point of intersection 18. In contrast to the first exemplary embodiment, the longitudinal axes 12 are not in the second exemplary embodiment one level. The radii 14 decrease in the longitudinal directions 15 along the longitudinal axes 12 . A conical receptacle 27 with a receptacle axis 28 is also formed here by the lateral surfaces 13 for the workpiece 20 . The conical receptacle 27 is a geometric surface 31, which is determined by the lateral surfaces 13 of the support rollers 11. The surface 31 has a center point 32 and rises outwards, ie counter to the longitudinal directions 15, counter to the earth's gravitational field vector g. The recording axis 28 is essentially parallel to the earth's gravitational field vector g. Usually, as is the case here, the receiving axis 28 coincides with the centering axis 26 .

Reference sign

1

descaling device

2

Housing

3

workpiece drive

4

first tinder

5

second descaler

6

third tinder

7

fourth tinder

8th

carrier

9

idler module

10

storage

11

support roller

12

longitudinal axis

13

lateral surface

14

radius

15

longitudinal direction

16

drive

17

engine

18

intersection

19

level

20

workpiece

21

first face

22

second face

23

outer surface

24

inner lateral surface

25

outer contour

26

center axis

27

conical mount

28

recording axis

29

recording opening angle

30

cone opening angle

31

geometric surface

32

Focus

Claims (10)

1. Workpiece drive (3) for rotating a circular workpiece (20) in a descaling device (1),

   wherein the workpiece drive (3) has a support (8),

   characterized in

   that the workpiece drive (3) has at least three support roller modules (9),

   that each of the support roller modules (9) has a bearing (10) and a support roller (11) for the circular workpiece (20), wherein the support roller (11) has a longitudinal axis (12), a lateral surface (13) and a radius (14) between the longitudinal axis (12) and the lateral surface (13) and the radius (14) decreases in a longitudinal direction (15) along the longitudinal axis (12), and wherein the bearing (10) supports the support roller (11) rotatably about the longitudinal axis (12),

   that each of the support roller modules (9) comprises a drive (16) and the drive (16) is designed to rotate the support roller (11) about the longitudinal axis (12), and

   that the bearings (10) are arranged on the support (8) in such a way that the longitudinal axes (12) have a point of intersection (18), so that the longitudinal directions (15) are directed towards the point of intersection (18) and so that the lateral surfaces (13) for a workpiece (20) placed on the support rollers (11) form a conical receptacle (27) with a receptacle axis (28), wherein the receptacle axis (28) is oriented substantially parallel to the earth gravity field vector (g).
2. Workpiece drive according to claim 1, characterized in that a receptacle opening angle (90) of the conical receptacle is greater than 160° and less than 180°.
3. Workpiece drive (3) for rotating a circular workpiece (20) in a descaling device (1),

   wherein the workpiece drive (3) has a support (8),

   characterized in

   that the workpiece drive (3) has at least three support roller modules (9),

   that each of the support roller modules (9) has a bearing (10) and a support roller (11) for the circular workpiece (20), wherein the support roller (11) has a longitudinal axis (12), a lateral surface (13) and a radius (14) between the longitudinal axis (12) and the lateral surface (13), and the radius (14) decreases in a longitudinal direction (15) along the longitudinal axis (12), and wherein the bearing (10) supports the support roller (11) rotatably about the longitudinal axis (12),

   that each of the support roller modules (9) has a drive (16) and the drive (16) is designed to rotate the support roller (11) about the longitudinal axis (12), and

   that the bearings (10) are arranged on the support (8) in such a way that the longitudinal axes (12) have a point of intersection (18) and lie in a plane (19) perpendicular to the earth gravity field vector (g) and in such a way that the longitudinal directions (15) are directed towards the point of intersection (18).
4. Workpiece drive (3) according to any one of claims 1 to 3, characterized in that the bearings (10) are arranged on the support (8) in such a way that the longitudinal axes (12) are radially symmetrical.
5. Workpiece drive (3) according to any one of claims 1 to 4, characterized in that at least one of the lateral surfaces (13) is cone-shaped, preferably having a cone opening angle (30) greater than 0° and less than 60°.
6. Workpiece drive (3) according to any one of claims 1 to 5, characterized in that at least in one of the support roller modules (9), the bearing (10) is only on one side of the support roller (11) with respect to the longitudinal axis (12).
7. Workpiece drive (3) according to claim 6, characterized in that the support roller (11) is arranged between the bearing (10) and the intersection (18).
8. Descaling device (1) for a circular workpiece (20),

   wherein the descaling device (1) comprises a housing (2), a workpiece drive (3) for rotating the circular workpiece (20) and a first scale washer (4),

   wherein the first scale washer (4) is arranged in the housing (2), and

   wherein the housing (2) for receiving the circular workpiece (20) is designed with a first end surface (21), a second end surface (22), an outer lateral surface (23) and an inner lateral surface (24) on the workpiece drive (3),

   characterized in

   that the workpiece drive (3) is designed according to any one of claims 1 to 7,

   that the descaling device (1) comprises a second scale washer (5) and a third scale washer (6),

   that the first scale washer (4) is arranged on the support (8) for irradiating the outer lateral surface (23), the second scale washer (5) is arranged on the support (8) between two adjacent support rollers (11) for irradiating the first end surface (21), and the third scale washer (6) is arranged on the support (8) for irradiating the second end surface (22) with a liquid medium, and

   that the support rollers (11), the second scale washer (5) and the third scale washer (6) are arranged in the housing (2).
9. Descaling device (1) according to claim 8, characterized in that the descaling device (1) comprises a fourth scale washer (7), that the fourth scale washer (7) is arranged on the support (8) for irradiating the inner lateral surface (24) with the medium.
10. Descaling device (1) according to claim 9, characterized in that the fourth scale washer (7) is designed as a lance.

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