Punch forming equipment for accessory cross arm of electric iron

Abstract

The invention relates to the technical field of stamping, and discloses an electric iron accessory cross arm stamping forming device which comprises a base, a stamping platform, a pressing plate and a pressing plate. The first pressing plate and the second pressing plate are oppositely arranged on the two sides of the stamping table, a clamping groove is formed in the center of the stamping table and is of a conical structure, the included angle between the two side edges of the clamping groove is 90 degrees, a driving assembly is arranged on the stamping table, and the driving end of the driving assembly is connected with the first pressing plate and the second pressing plate. The first pressing plate and the second pressing plate move in parallel with the side edges of the adjacent clamping grooves respectively; the stamping block is movably connected to the first pressing plate or the second pressing plate, and the stamping block is configured to vertically move along the opposite side edges of the cross arm; and the stabilizing assembly is arranged on the stamping table, the stabilizing assembly is provided with a stabilizing end extending into the clamping groove, and the stabilizing end abuts against the outer side wall of the cross arm. The stamping effect on the cross arm can be improved.

Description

Technical Field

[0001] This invention relates to the field of stamping technology, and in particular to a stamping and forming equipment for crossarms of electric power equipment. Background Technology

[0002] Crossarm iron accessories are mainly used to install insulators and power fittings, and can support cables and keep them at a certain distance. According to the stress conditions of the crossarm, they are mainly divided into single crossarms and double crossarms. Under normal circumstances, crossarms are made by punching angle steel with stamping equipment. With the continuous development of technology, the requirements for punching are gradually increasing.

[0003] Currently, in the process of punching angle steel crossarms, multiple sets of pressure push rods are usually used for extrusion and fixing. For example, in the angle steel crossarm stamping and forming equipment of an electric porcelain iron accessory disclosed in CN112570550A, the angle iron is extruded and fixed in both horizontal and vertical directions, and then punched and punched by hydraulic push rods. However, the existing technology can only achieve single-hole stamping operation, which is not only inefficient, but also causes uneven force distribution at the angle iron's corner position due to clamping and fixing the angle iron in both horizontal and vertical directions. Under the extrusion of the two pressure plates, the two sides of the angle iron are easily deformed towards the middle, affecting the stamping quality. Summary of the Invention

[0004] The purpose of this invention is to provide a stamping and forming equipment for crossarms of electric railway accessories, so as to solve the problems existing in the prior art and improve the stamping effect of crossarms.

[0005] To achieve the above objectives, the present invention provides the following solution: The present invention provides a stamping and forming equipment for crossarms of electric railway accessories, comprising: The base has a stamping platform fixed to its top surface; The first pressure plate and the second pressure plate are arranged opposite to each other on both sides of the stamping table. A slot is provided in the center of the stamping table. The slot is a conical structure and the two sides of the slot are at an included angle of 90°. A driving assembly is provided on the stamping table. The driving end of the driving assembly is connected to the first pressure plate and the second pressure plate respectively, so that the first pressure plate and the second pressure plate can move parallel to the adjacent sides of the slot respectively. A stamping block is movably connected to the first or second pressure plate, and the stamping block is configured to move vertically along the opposite crossbeam side. A stabilizing component is disposed on the stamping table, the stabilizing component having a stabilizing end that extends into the slot and abuts against the outer wall of the crossarm.

[0006] Preferably, the crossbeam is placed in the slot, and the two sides of the crossbeam extend perpendicularly to each other and away from the slot, and the first pressure plate and the second pressure plate abut against the two sides of the crossbeam respectively. The inner wall of the card slot has a stamping groove on the side opposite to the stamping block.

[0007] Preferably, the driving component includes: Two mounting seats are respectively fixed to both sides of the top surface of the stamping table. The two mounting seats extend upward at an angle along the direction of mutual approach. The top of the mounting seat is arranged above the slot. A first cylinder is fixed to the mounting seat. The piston end of the first cylinder passes through the mounting seat and is fixed to the first pressure plate or the second pressure plate. A guide unit is arranged on the mounting base, and the guide unit is connected to the first pressure plate or the second pressure plate so that the first pressure plate and the second pressure plate can move in mutually perpendicular directions.

[0008] Preferably, the guiding unit includes: A plurality of guide rods are arranged along the length of the mounting base. The guide rods are fixed at equal intervals to the first pressure plate or the second pressure plate. The end of the guide rod away from the first pressure plate or the second pressure plate passes through the adjacent mounting base. The guide rod is slidably connected to the mounting base.

[0009] Preferably, the mounting base is provided with a hydraulic mechanism, the drive end of the hydraulic mechanism is connected to the stamping block, and a plurality of stamping blocks are distributed at equal intervals along the length of the mounting base. The number of hydraulic mechanisms and stamping blocks are the same and correspond one-to-one. Some of the hydraulic mechanisms are configured to start and stop synchronously or individually.

[0010] Preferably, the hydraulic mechanism includes a hydraulic cylinder, which is fixedly connected to the first pressure plate or the second pressure plate. A groove is provided on the mounting base connected to the hydraulic cylinder, and the hydraulic cylinder is embedded in the groove so that the hydraulic cylinder is close to the middle of the first pressure plate or the second pressure plate. The hydraulic cylinder is slidably connected to the mounting base, and the piston end of the hydraulic cylinder passes through the first pressure plate or the second pressure plate and is fixedly connected to the stamping block.

[0011] Preferably, the stabilizing component includes: A stabilizing rod is horizontally inserted into the stamping table, and the stabilizing rod is slidably connected to the stamping table; An elastic unit is disposed on the stamping table, and the elastic end of the elastic unit is connected to the stabilizing rod so that the stabilizing rod has an elastic tendency toward the slot. A vibrating element is disposed on the stamping table, and the vibrating end of the vibrating element is connected to the stabilizing rod.

[0012] Preferably, the elastic unit includes: A fixing plate is fixed to the outer wall of the stamping table. The fixing plate has an L-shaped structure. One side of the fixing plate is opposite to the stabilizing rod, and a servo motor is fixed to this side. The output shaft of the servo motor is fixed to a screw. A threaded hole is opened in the stabilizing rod, and the screw is threadedly connected to the threaded hole. A collar is fitted and fixed to one end of the stabilizing rod extending from the stamping table. The collar and the two ends of a spring are respectively fixed between the collar and the fixed plate. The collar and the fixed plate are in a limiting sliding contact.

[0013] Preferably, a limiting plate is fixedly connected to the side wall of the collar, a limiting groove is formed on the fixing plate, the limiting plate slides with the limiting groove, and the vibrating element is mounted on the limiting plate.

[0014] Preferably, a pad is provided between the first pressure plate and the second pressure plate and the side of the adjacent crossbeam, the pad being detachably connected to the first pressure plate and the second pressure plate, and the pad having an adjustable thickness.

[0015] The present invention discloses the following technical effects: This invention utilizes a stamping table with slots to hold the crossarm. The slots are tapered, ensuring the angled edges of the crossarm face downwards. A first and second pressure plate, positioned opposite each other, are driven by a drive assembly to move parallel to the edge of the slot, thus pressing and fixing the crossarm vertically on both sides. A punching block on the first or second pressure plate then punches holes in the crossarm. During this process, the first and second pressure plates work together to press the crossarm towards the lowest point of the slot, preventing bending deformation at the angled edges of the angle iron structure. A stabilizing assembly further reinforces the crossarm, effectively improving the stamping effect. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a diagram showing the connection relationship between the stamping table and the crossbeam in this invention; Figure 2 This is a diagram showing the positional relationship between the pad and the crossbeam in this invention; Figure 3 This is a schematic diagram of the card slot structure in this invention; Figure 4This is a diagram showing the connection relationship between the screw and the stabilizing rod in this invention; Figure 5 This is a diagram showing the connection relationship between the fixing plate and the limiting plate in this invention; The components are as follows: 1. Base; 2. Stamping table; 3. First pressure plate; 4. Second pressure plate; 5. Stamping block; 6. Mounting seat; 7. First cylinder; 8. Guide rod; 9. Hydraulic cylinder; 10. Vibrating component; 11. Insert groove; 12. Stabilizing rod; 13. Spring; 14. Fixing plate; 15. Screw; 16. Servo motor; 17. Collar; 18. Limiting plate; 19. Limiting groove; 20. Pad; 21. Slot; 22. Stamping groove; 23. Crossbeam. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] Reference Figures 1-5 This invention provides a stamping and forming equipment for crossarms of electric railway accessories, comprising: The base 1 has a stamping table 2 fixedly attached to its top surface; a first pressure plate 3 and a second pressure plate 4 are arranged opposite to each other on both sides of the stamping table 2. A slot 21 is provided in the center of the stamping table 2. The slot 21 has a conical structure and the two sides of the slot 21 have an included angle of 90°. A driving assembly is provided on the stamping table 2. The driving end of the driving assembly is connected to the first pressure plate 3 and the second pressure plate 4 respectively, so that the first pressure plate 3 and the second pressure plate 4 can move parallel to the side of the adjacent slot 21 respectively. A stamping block 5 is movably connected to a first pressure plate 3 or a second pressure plate 4, and the stamping block 5 is configured to move vertically along the opposite side of the crossbeam 23; a stabilizing assembly is disposed on the stamping table 2, and the stabilizing assembly has a stabilizing end that extends into a slot 21 and abuts against the outer wall of the crossbeam 23.

[0021] This invention utilizes a stamping table 2 with a slot 21 to hold a crossarm 23 placed within it. The slot 21 is tapered, ensuring the angled edges of the crossarm 23 face downwards. A first pressure plate 3 and a second pressure plate 4 are positioned opposite each other, and a driving assembly moves them parallel to the edge of the slot 21, thus pressing and fixing the crossarm 23 vertically. A stamping block 5, movably mounted on the first or second pressure plate 3, punches holes in the crossarm 23. During this process, the first and second pressure plates 3 and 4 press the crossarm 23 together towards the lowest point of the slot 21, preventing bending deformation at the angled edges of the angle iron structure. Simultaneously, a stabilizing assembly further reinforces the crossarm 23, effectively improving the stamping effect.

[0022] Furthermore, the crossbeam 23 is placed in the slot 21, and the two sides of the crossbeam 23 extend perpendicularly to each other and away from the slot 21. The first pressure plate 3 and the second pressure plate 4 abut against the two sides of the crossbeam 23 respectively. Among them, a stamping groove 22 is provided on the inner wall surface of the card slot 21 on the side opposite to the stamping block 5.

[0023] By opening the stamping groove 22, space is reserved for the punching position of the crossarm 23, so that the stamping block 5 can stamp the crossarm 23.

[0024] Furthermore, the driving components include: Two mounting seats 6 are fixedly connected to the top surface of the stamping table 2 on both sides respectively. The two mounting seats 6 extend upward at an angle along the direction of mutual approach. The top of the mounting seat 6 is arranged above the slot 21. A first cylinder 7 is fixedly connected to the mounting seat 6. The piston end of the first cylinder 7 passes through the mounting seat 6 and is fixedly connected to the first pressure plate 3 or the second pressure plate 4. A guide unit is arranged on the mounting base 6. The guide unit is connected to the first pressure plate 3 or the second pressure plate 4 so that the first pressure plate 3 and the second pressure plate 4 can move in mutually perpendicular directions.

[0025] Several first cylinders 7 are fixedly installed using mounting base 6, and the piston end of the first cylinder 7 is fixedly connected to the adjacent first pressure plate 3 or second pressure plate 4 to achieve clamping and fixing of the crossarm 23. In addition, by setting a guide unit, the first pressure plate 3 and the second pressure plate 4 can move smoothly, thereby enhancing the fixing effect of the crossarm 23.

[0026] Furthermore, the guiding unit includes: Several guide rods 8 are arranged along the length of the mounting base 6. Several guide rods 8 are fixed at equal intervals to the first pressure plate 3 or the second pressure plate 4. The end of the guide rod 8 away from the first pressure plate 3 or the second pressure plate 4 passes through the adjacent mounting base 6, and the guide rod 8 is slidably connected to the mounting base 6.

[0027] Several guide rods 8 are slidably connected to the mounting base 6, and the guide rods 8 are fixed to the first pressure plate 3 and the second pressure plate 4, thereby enhancing the sliding stability of the first pressure plate 3 and the second pressure plate 4.

[0028] Furthermore, a hydraulic mechanism is provided on the mounting base 6. The drive end of the hydraulic mechanism is connected to the stamping block 5. Several stamping blocks 5 are distributed at equal intervals along the length of the mounting base 6. The number of hydraulic mechanisms is the same as that of stamping blocks 5 and they correspond one-to-one. Among them, several hydraulic mechanisms are configured to start and stop synchronously or individually.

[0029] The hydraulic mechanism provides stamping power to the stamping block 5, enabling the stamping block 5 to punch holes in the crossarm 23. Furthermore, the hydraulic mechanism can be started and stopped individually or synchronously to meet different punching requirements for the crossarm 23.

[0030] Furthermore, the hydraulic mechanism includes a hydraulic cylinder 9, which is fixedly connected to the first pressure plate 3 or the second pressure plate 4. A groove 11 is provided on the mounting seat 6 of the connected hydraulic cylinder 9, and the hydraulic cylinder 9 is embedded in the groove 11 so that the hydraulic cylinder 9 is close to the middle of the first pressure plate 3 or the second pressure plate 4. The hydraulic cylinder 9 is slidably connected to the mounting seat 6, and the piston end of the hydraulic cylinder 9 passes through the first pressure plate 3 or the second pressure plate 4 and is fixedly connected to the stamping block 5.

[0031] By using the groove 11 opened on the mounting base 6, when the hydraulic cylinder 9 is fixed to the first pressure plate 3 or the second pressure plate 4, it can fit more closely to the middle position of the first pressure plate 3 and the second pressure plate 4, thus making it easier to stably fix the piston end of the hydraulic cylinder 9 to the stamping block 5, and realize efficient and high-quality stamping processing of the crossbeam 23.

[0032] Furthermore, the stabilizing components include: The stabilizing rod 12 is horizontally inserted into the stamping table 2 and is slidably connected to the stamping table 2. An elastic unit is provided on the stamping table 2. The elastic end of the elastic unit is connected to the stabilizing rod 12 so that the stabilizing rod 12 has an elastic tendency toward the slot 21. A vibrating element 10 is provided on the stamping table 2. The vibrating end of the vibrating element 10 is connected to the stabilizing rod 12.

[0033] The stabilizing rod 12 is slidably connected inside the stamping table 2, and an elastic unit is set on the stamping table 2 to elastically support the stabilizing rod 12, so that the stabilizing rod 12 elastically abuts against the outer wall of the crossbeam 23. The vibrating element 10 set on the stamping table 2 drives the stabilizing rod 12 to vibrate. While maintaining the stabilizing rod 12 abutting against the crossbeam 23, the vibration can also cause the crossbeam 23 to resonate, thereby better fitting with the slot 21 and enhancing the stabilizing effect on the crossbeam 23.

[0034] Furthermore, the elastic unit includes: The fixing plate 14 is fixed to the outer wall of the stamping table 2. The fixing plate 14 has an L-shaped structure. One side of the fixing plate 14 is opposite to the stabilizing rod 12, and a servo motor 16 is fixed to this side. The output shaft of the servo motor 16 is fixed to a screw 15. A threaded hole is opened in the stabilizing rod 12, and the screw 15 is threadedly connected to the threaded hole. The collar 17 is sleeved and fixedly connected to one end of the stabilizing rod 12 that extends out of the stamping table 2. The two ends of the spring 13 are respectively fixed between the collar 17 and the relative fixed plate 14. The collar 17 and the fixed plate 14 are in a limited sliding contact.

[0035] The stabilizing rod 12 is fixed to the collar 17 to prevent it from sliding into the slot 21. A threaded hole is made on the stabilizing rod 12, and the screw 15 is threadedly connected to the stabilizing rod 12. As the servo motor 16 rotates, the stabilizing rod 12 moves toward or away from the slot 21. A spring 13 is fixed to the collar 17, and the spring 13 can be directly wound around the screw 15. This not only provides elastic support force to the stabilizing rod 12, allowing it to move smoothly, but also amplifies the vibration effect of the vibrating element 10 and enhances the stabilizing effect of the stabilizing rod 12 on the crossarm 23.

[0036] Furthermore, a limiting plate 18 is fixedly connected to the side wall of the collar 17, and a limiting groove 19 is opened on the fixing plate 14. The limiting plate 18 and the limiting groove 19 are slidably connected, and the vibrating element 10 is installed on the limiting plate 18.

[0037] The limiting plate 18 is slidably connected in the limiting groove 19 to prevent the stabilizing rod 12 from rotating synchronously with the screw 15 when the screw 15 rotates.

[0038] Specifically, the vibrating element 10 uses a common miniature vibration motor. By fixing the miniature vibration motor to the limiting plate 18, the vibration transmission effect of the stabilizing rod 12 is achieved.

[0039] Furthermore, a pad 20 is provided between the first pressure plate 3 and the second pressure plate 4 and the side of the adjacent crossbeam 23. The pad 20 is detachably connected to the first pressure plate 3 and the second pressure plate 4, and the pad 20 has an adjustable thickness.

[0040] This invention provides the working principle of a power railway accessory crossarm stamping and forming equipment: By placing the crossarm 23 in the slot 21 and extending the angled side of the crossarm 23 into the bottom of the slot 21, the first cylinder 7 is driven to drive the first pressure plate 3 and the second pressure plate 4 on the mounting base 6 on both sides, so that the first pressure plate 3 and the second pressure plate 4 press and fix the two sides of the crossarm 23 in a mutually perpendicular direction. Then, the hydraulic cylinder 9 drives the stamping block 5 to move and punch holes in the crossarm 23. During the punching process, the spring 13, the vibrating element 10 and the stabilizing rod 12 cooperate to transmit vibration to the side wall of the crossarm 23 and press the crossarm 23 in the horizontal direction, which effectively improves the connection stability between the crossarm 23 and the stamping table 2.

[0041] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0042] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A stamping and forming equipment for crossarms of electric railway accessories, characterized in that, include: The base (1) has a stamping table (2) fixedly attached to its top surface. The first pressure plate (3) and the second pressure plate (4) are arranged opposite to each other on both sides of the stamping table (2). The stamping table (2) has a slot (21) in the center. The slot (21) is a conical structure. The two sides of the slot (21) are at an angle of 90°. The stamping table (2) is provided with a driving assembly. The driving end of the driving assembly is connected to the first pressure plate (3) and the second pressure plate (4) respectively, so that the first pressure plate (3) and the second pressure plate (4) can move parallel to the side of the adjacent slot (21). A stamping block (5) is movably connected to the first pressure plate (3) or the second pressure plate (4), and the stamping block (5) is configured to move vertically along the opposite side of the crossbeam (23); A stabilizing component is disposed on the stamping table (2), the stabilizing component having a stabilizing end that extends into the slot (21) and abuts against the outer wall of the crossbeam (23).

2. The electric railway accessory crossarm stamping and forming equipment according to claim 1, characterized in that: The crossbeam (23) is placed in the slot (21), and the two sides of the crossbeam (23) extend perpendicularly to each other and away from the slot (21). The first pressure plate (3) and the second pressure plate (4) abut against the two sides of the crossbeam (23) respectively. The inner wall of the slot (21) is provided with a stamping groove (22) on the side opposite to the stamping block (5).

3. The electric railway accessory crossarm stamping and forming equipment according to claim 1, characterized in that, The driving component includes: Two mounting seats (6) are respectively fixed to the top surface of the stamping table (2). The two mounting seats (6) extend upward at an angle along the direction of mutual approach. The top of the mounting seat (6) is arranged above the slot (21). A first cylinder (7) is fixed on the mounting seat (6). The piston end of the first cylinder (7) passes through the mounting seat (6) and is fixed to the first pressure plate (3) or the second pressure plate (4). A guide unit is arranged on the mounting base (6), and the guide unit is connected to the first pressure plate (3) or the second pressure plate (4) so ​​that the first pressure plate (3) and the second pressure plate (4) move in mutually perpendicular directions.

4. The electric railway accessory crossarm stamping and forming equipment according to claim 3, characterized in that, The guiding unit includes: A number of guide rods (8) are arranged along the length of the mounting base (6). The guide rods (8) are fixed at equal intervals on the first pressure plate (3) or the second pressure plate (4). The end of the guide rod (8) away from the first pressure plate (3) or the second pressure plate (4) passes through the adjacent mounting base (6). The guide rod (8) is slidably connected to the mounting base (6).

5. The electric railway accessory crossarm stamping and forming equipment according to claim 3, characterized in that: A hydraulic mechanism is provided on the mounting base (6). The driving end of the hydraulic mechanism is connected to the stamping block (5). Several stamping blocks (5) are distributed at equal intervals along the length of the mounting base (6). The number of hydraulic mechanisms is the same as that of the stamping blocks (5) and they correspond one-to-one. Some of the hydraulic mechanisms are configured to start and stop synchronously or individually.

6. The electric railway accessory crossarm stamping and forming equipment according to claim 5, characterized in that, The hydraulic mechanism includes a hydraulic cylinder (9), which is fixedly connected to the first pressure plate (3) or the second pressure plate (4). A groove (11) is provided on the mounting seat (6) connected to the hydraulic cylinder (9). The hydraulic cylinder (9) is embedded in the groove (11) so that the hydraulic cylinder (9) is close to the middle of the first pressure plate (3) or the second pressure plate (4). The hydraulic cylinder (9) is slidably connected to the mounting seat (6). The piston end of the hydraulic cylinder (9) passes through the first pressure plate (3) or the second pressure plate (4) and is fixedly connected to the stamping block (5).

7. The electric railway accessory crossarm stamping and forming equipment according to claim 1, characterized in that, The stabilizing component includes: A stabilizing rod (12) is inserted horizontally into the stamping table (2), and the stabilizing rod (12) is slidably connected to the stamping table (2); An elastic unit is provided on the stamping table (2), and the elastic end of the elastic unit is connected to the stabilizing rod (12) so that the stabilizing rod (12) has an elastic tendency toward the slot (21). A vibrating element (10) is provided on the stamping table (2), and the vibrating end of the vibrating element (10) is connected to the stabilizing rod (12).

8. The electric railway accessory crossarm stamping and forming equipment according to claim 7, characterized in that, The elastic unit includes: A fixing plate (14) is fixed to the outer wall of the stamping table (2). The fixing plate (14) has an L-shaped structure. One side of the fixing plate (14) is opposite to the stabilizing rod (12), and a servo motor (16) is fixed to the side. A screw (15) is fixed to the output shaft of the servo motor (16). A threaded hole is opened in the stabilizing rod (12), and the screw (15) is threadedly connected to the threaded hole. A collar (17) is fitted and fixed to one end of the stabilizing rod (12) extending out of the stamping table (2). The collar (17) and the two ends of the spring (13) are respectively fixed between the collar (17) and the fixed plate (14). The collar (17) and the fixed plate (14) are in a limiting sliding contact.

9. The electric railway accessory crossarm stamping and forming equipment according to claim 8, characterized in that: The collar (17) is fixed to the side wall of the limiting plate (18), and the fixing plate (14) is provided with a limiting groove (19). The limiting plate (18) slides with the limiting groove (19), and the vibrating element (10) is installed on the limiting plate (18).

10. The electric railway accessory crossarm stamping and forming equipment according to claim 1, characterized in that: A pad (20) is provided between the first pressure plate (3) and the second pressure plate (4) and the side of the adjacent crossbeam (23). The pad (20) is detachably connected to the first pressure plate (3) and the second pressure plate (4). The pad (20) has an adjustable thickness.

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