Adjustable stainless steel plate edge folding anti-rebound device

Abstract

The utility model relates to a stainless steel sheet processing related technical field especially a kind of adjustable stainless steel sheet material flanging anti-rebound device, including support seat, support frame, fixed seat, flanging dynamic mould, driving part, flanging fixed mould and press plate assembly, the driving part includes direct acting part and guide assembly.The utility model a kind of adjustable stainless steel sheet material flanging anti-rebound device driving part is pushed down by direct acting part and moves flanging dynamic mould, flanging dynamic mould and flanging fixed mould interact to carry out flanging to stainless steel plate, while guide assembly ensures the linear motion of flanging dynamic mould, the both sides of press plate assembly fixed stainless steel plate, avoid its deviation in flanging process, to ensure the accuracy and stability of flanging operation.

Description

Technical Field

[0001] This utility model relates to the technical field of stainless steel plate processing, and in particular to an adjustable stainless steel plate edge folding anti-springback device. Background Technology

[0002] Stainless steel sheets are widely used in building decoration, kitchen and bathroom equipment, medical devices, and industrial equipment due to their excellent corrosion resistance, strength, and aesthetics. Bending is one of the key processes in processing these sheets. However, the inherent high yield strength and modulus of elasticity of stainless steel cause significant springback after bending and unloading. This springback causes the actual bending angle to deviate from the preset die angle, seriously affecting the dimensional accuracy and assembly performance of the product, especially in the manufacture of precision sheet metal parts requiring high-precision fits.

[0003] A related technology, CN219561032U, describes an inner lining plate folding machine. It includes a frame with an upper moving mold and a lower stationary mold arranged opposite each other. A hydraulic cylinder is also fixed to the frame, with the upper moving mold fixed to the drive rod end. The hydraulic cylinder drives the upper moving mold to move closer to or away from the lower stationary mold, thereby pressurizing and forming the steel plate between the two molds. This invention allows for hydraulic valve reversal controlled by an electrical button. A hydraulic pump drives the hydraulic cylinder to apply pressure to the stainless steel plate between the two special molds, performing folding. This changes the traditional folding process using two rollers, achieving a low failure rate and high production efficiency. In practical operation, the lining plate folding device described above has a drawback: it is inconvenient to effectively fix both sides when folding the lining plate, causing the lining plate to easily shift position during the stamping process. This shift severely affects the quality and efficiency of the folding, especially in mass production, reducing the success rate of one-time forming, increasing subsequent adjustment and correction steps, and further reducing production efficiency. Utility Model Content

[0004] This utility model solves the problems in related technologies and proposes an adjustable stainless steel sheet folding anti-springback device. The driving component pushes the folding moving mold downward through the linear motion component. The folding moving mold and the folding fixed mold interact to fold the stainless steel sheet. At the same time, the guiding component ensures the linear movement of the folding moving mold. The pressure plate component fixes both sides of the stainless steel sheet to prevent it from shifting during the folding process, thereby ensuring the accuracy and stability of the folding operation.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: an adjustable stainless steel sheet folding anti-springback device, including a support base, a support frame fixedly disposed on the rear end face of the support base, a fixed base fixedly connected to the support frame, a folding moving mold disposed relative to the fixed base, a driving component for driving the folding moving mold, a folding fixed mold fixedly connected to the support base and disposed relative to the folding moving mold, and pressure plate assemblies respectively disposed on both sides of the folding moving mold; The driving component includes a linear actuator and a guide assembly for guiding the movement direction of the linear actuator.

[0006] By adopting the above technical solution, the driving component pushes the bending moving mold downward through the linear motion component. The bending moving mold and the bending fixed mold interact to bend the stainless steel plate. At the same time, the guiding component ensures the linear motion of the bending moving mold, and the pressure plate component fixes the two sides of the stainless steel plate to prevent it from shifting during the bending process, thereby ensuring the accuracy and stability of the bending operation.

[0007] As a preferred embodiment, the linear actuator includes a movable seat fixedly connected to the folding moving mold, a connecting shaft fixedly connected to the upper end face of the movable seat, a hydraulic cylinder coaxially arranged with the connecting shaft, and a fixed seat for fixing the hydraulic cylinder, wherein the fixed seat is fixedly connected to the support frame.

[0008] By adopting the above technical solution, the movable seat, which is fixedly connected to the folding moving mold, is responsible for stably supporting the folding moving mold and moving with it; the connecting shaft is connected to the movable seat in a fixed manner to transmit force; the oil cylinder is coaxially set with the connecting shaft to provide the necessary horizontal movement power; and the fixed seat is fixedly connected to the support frame to ensure the stability of the oil cylinder during operation.

[0009] As a preferred embodiment, the guide assembly includes guide rods slidably disposed on both sides of the movable seat, a guide sleeve disposed at the connection between the movable seat and the guide rods, and a fixed support fixedly disposed at the connection between the upper end face of the guide rods and the support frame, wherein the fixed support is fixedly connected to the support frame.

[0010] By adopting the above technical solution, the fixed support facilitates the fixing of the upper end face of the guide rod.

[0011] As a preferred embodiment, the end of the guide rod that is connected away from the fixed support is fixedly connected to the upper end surface of the support base.

[0012] By adopting the above technical solution, the upper end of the support base can be used to fix the end of the guide rod away from the fixed support.

[0013] As a preferred embodiment, the outer periphery of the guide bushing is fixedly connected to the movable seat, and the inner wall of the guide bushing is slidably connected to the guide rod.

[0014] By adopting the above technical solution, the guide rod is responsible for support and guidance, and the smooth movement of the moving seat is ensured by the sliding cooperation with the guide bushing; the guide bushing is fixed on the moving seat and slidably connected to the guide rod, which effectively reduces the friction between the two, thereby improving the movement stability of the moving seat; the fixed support is used to fix the upper end face of the guide rod to ensure its stability at the connection point; and the support base fixes the lower end face of the guide rod to enhance the overall structural stability.

[0015] As a preferred embodiment, the pressure plate assembly includes a first pressure plate disposed at one end of the folding moving mold, a second pressure plate disposed at the other end of the folding moving mold, and connecting members disposed between the first pressure plate and the second pressure plate and the movable seat, wherein the lower horizontal surfaces of the first pressure plate and the second pressure plate are disposed below the lower horizontal surface of the folding moving mold.

[0016] By adopting the above technical solution, when the moving seat drives the bending moving mold, the first pressure plate, and the second pressure plate to move downwards, the first and second pressure plates first contact and fix with the stainless steel material. Pressure sensors are respectively installed on the lower end faces of the first and second pressure plates, which are located below the lower horizontal plane of the bending moving mold. Their main function is to ensure that when the moving seat drives the entire device downwards, they first contact and press firmly against the stainless steel material to be processed, ensuring the stability of the stainless steel material during processing. Simultaneously, the pressure sensors installed on the lower end faces of the first and second pressure plates can monitor the clamping force in real time, ensuring that the clamping force is within the process requirements.

[0017] As a preferred embodiment, the connecting member includes a sliding rod fixedly connected to the first pressure plate and the second pressure plate, a sliding hole adapted to the sliding rod on the movable seat, a buffer bushing fixedly disposed on the inner wall of the sliding hole, a limiting retaining ring fixedly disposed on the other end of the sliding rod, and a tension spring disposed on the outer periphery of the sliding rod, wherein the outer diameter of the limiting retaining ring is smaller than the inner diameter of the sliding hole.

[0018] By adopting the above technical solution, the sliding hole is set on the movable seat and adapted to the sliding rod, ensuring the sliding guidance of the sliding rod. The buffer bushing is fixedly set on the inner wall of the sliding hole, which can reduce the wear between the sliding rod and the sliding hole and improve the service life of the connecting parts. The limit retaining ring is fixedly set on the other end of the sliding rod, and its outer diameter is smaller than the inner diameter of the sliding hole, preventing the sliding rod from coming out of the sliding hole during sliding and ensuring the stability of the connecting parts. The tension spring is set on the outer periphery of the sliding rod, which can provide a certain preload to ensure that the sliding rod is always in contact with the sliding hole during the movement of the sliding rod and avoid the phenomenon of empty stroke. When the first pressure plate and the second pressure plate need to move, they drive the sliding rod to slide in the sliding hole. At the same time, the tension spring ensures good contact between the sliding rod and the sliding hole through the preload, ensuring that the sliding rod will not come out of the sliding hole during the pressing process.

[0019] As a preferred embodiment, one end of the tension spring is fixedly connected to the movable seat, and the other end is fixedly connected to the upper end face of the first pressure plate and the second pressure plate.

[0020] By adopting the above technical solution, one end of the tension spring is fixedly connected to the movable seat, and the other end is connected to the upper surface of the first and second pressure plates. When the movable seat moves downward, it drives the first and second pressure plates to press down and contact the stainless steel plate, thereby pressing the stainless steel plate and ensuring that it will not move during the bending process. The movable seat continues to move downward until the bending moving mold and the bending fixed mold are closed, at which point the tension spring is compressed, producing a contraction effect. After the bending is completed, the tension spring resets, pushing the first and second pressure plates upward to return to their initial positions. The guide bushing and sliding hole ensure the straightness and stability of the sliding rod during the movement, ensuring the precise operation of the entire equipment.

[0021] Compared with the prior art, the beneficial effects of this utility model are: This utility model; The support frame is fixedly installed on the rear end face of the support base, providing stable support for the fixed base; the bending moving mold is set relative to the fixed base and can move up and down with the drive of the drive component to realize the bending operation of the stainless steel plate. The driving component includes a linear actuator and a guide assembly. The linear actuator can push the bending moving die downward to achieve the pressing and bending of the stainless steel plate, while the guide assembly ensures that the bending moving die maintains linear motion during the downward movement and avoids deviation. The pressure plate assemblies are respectively set on both sides of the bending moving mold, which can effectively fix the two sides of the stainless steel plate and prevent the stainless steel plate from shifting position during the bending process. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of an adjustable stainless steel sheet folding anti-springback device according to this utility model. Figure 2This utility model relates to an adjustable stainless steel sheet folding anti-springback device. Figure 1 A structural schematic diagram of the enlarged view at point A; Figure 3 This utility model relates to an adjustable stainless steel sheet folding anti-springback device. Figure 1 A structural schematic diagram of the side view; Figure 4 This is a schematic diagram of the pressure plate in an adjustable stainless steel sheet folding anti-springback device of this utility model; In the picture: 1. Support base; 2. Support frame; 3. Movable base; 31. Guide rod; 311. Guide bushing; 32. Fixed support; 41. Folding moving mold; 42. Folding fixed mold; 51. First pressure plate; 52. Second pressure plate; 6. Sliding rod; 61. Limiting retaining ring; 62. Buffer bushing; 63. Tension spring; 7. Connecting shaft; 8. Hydraulic cylinder; 81. Fixed base. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0024] like Figures 1 to 4 As shown, an adjustable stainless steel sheet folding anti-springback device includes a support base 1, a support frame 2 fixedly disposed on the rear end face of the support base 1, a fixed base 81 fixedly connected to the support frame 2, a folding moving mold 41 disposed relative to the fixed base 81, a driving component for driving the folding moving mold 41, a folding fixed mold 42 fixedly connected to the support base 1 and disposed relative to the folding moving mold 41, and pressure plate assemblies respectively disposed on both sides of the folding moving mold 41. Please refer to details. Figure 1 , Figure 2 , Figure 3 and Figure 4The driving component includes a linear actuator and a guide assembly for guiding the movement direction of the linear actuator. The support frame 2 is fixedly installed on the rear end face of the support base 1 to provide stable support for the fixed base 81. The bending moving mold 41 is set relative to the fixed base 81 and can move up and down with the drive of the driving component to realize the bending operation of the stainless steel plate. The driving component includes a linear actuator and a guide assembly. The linear actuator can push the bending moving mold 41 downward to realize the pressing and bending of the stainless steel plate, while the guide assembly ensures that the bending moving mold 41 maintains linear movement during the downward movement and avoids deviation. The pressure plate assembly is respectively set on both sides of the bending moving mold 41, which can effectively fix both sides of the stainless steel plate and prevent the stainless steel plate from shifting position during the bending process. The working principle of the device is as follows: the driving component pushes the bending moving mold 41 downward through the linear motion component. The bending moving mold 41 interacts with the bending fixed mold 42 to bend the stainless steel plate. At the same time, the guide component ensures the linear movement of the bending moving mold 41. The pressure plate component fixes both sides of the stainless steel plate to prevent it from shifting during the bending process, thereby ensuring the accuracy and stability of the bending operation.

[0025] Please refer to details. Figure 1 , Figure 3 and Figure 4 The linear actuator includes a movable seat 3 fixedly connected to the bending die 41, a connecting shaft 7 fixedly connected to the upper end face of the movable seat 3, a hydraulic cylinder 8 coaxially arranged with the connecting shaft 7, and a fixed seat 81 for fixing the hydraulic cylinder 8. The fixed seat 81 is fixedly connected to the support frame 2. The movable seat 3, fixedly connected to the bending die 41, is responsible for stably supporting the bending die 41 and moving with it. The connecting shaft 7 is fixedly connected to the movable seat 3, which plays a role in transmitting force. The hydraulic cylinder 8 is coaxially arranged with the connecting shaft 7, providing the necessary horizontal movement power. The fixed seat 81 is fixedly connected to the support frame 2 to ensure the stability of the hydraulic cylinder 8 during operation. The working principle is as follows: the hydraulic cylinder 8 pushes the movable seat 3 to move horizontally up and down through the connecting shaft 7, thereby driving the bending die 41 fixedly connected to the movable seat 3 to move synchronously, realizing efficient bending processing operation.

[0026] Please refer to details. Figure 1 and Figure 3The guiding assembly includes guide rods 31 slidably disposed on both sides of the movable seat 3, guide sleeves 311 disposed at the connection between the movable seat 3 and the guide rods 31, and a fixed support 32 fixedly disposed at the connection between the upper end face of the guide rods 31 and the support frame 2. The fixed support 32 is fixedly connected to the support frame 2, and the fixed support 32 facilitates the fixation of the upper end face of the guide rods 31. The end of the guide rods 31 away from the fixed support 32 is fixedly connected to the upper end face of the support seat 1, and the upper end face of the support seat 1 facilitates the fixation of the end of the guide rods 31 away from the fixed support 32. The outer periphery of guide sleeve 311 is fixedly connected to the movable seat 3, and the inner wall of guide sleeve 311 is slidably connected to guide rod 31. Guide rod 31 is responsible for support and guidance, and the smooth movement of movable seat 3 is ensured by sliding cooperation with guide sleeve 311. Guide sleeve 311 is fixed on movable seat 3 and slidably connected to guide rod 31, which effectively reduces the friction between the two, thereby improving the movement stability of movable seat 3. Fixed support 32 is used to fix the upper end face of guide rod 31 to ensure its stability at the connection point. Support seat 1 fixes the lower end face of guide rod 31 to enhance the overall structural stability. The overall working principle is as follows: Movable seat 3 is slidably connected to guide rod 31 through guide sleeve 311, so that movable seat 3 can move smoothly within a limited path; fixed support 32 and support seat 1 fix the two ends of guide rod 31 respectively, providing stable support and ensuring that guide rod 31 will not deviate, thereby ensuring the reliability and stability of the entire guiding assembly.

[0027] Please refer to details. Figure 1 , Figure 2 and Figure 3The pressure plate assembly includes a first pressure plate 51 disposed at one end of the bending moving mold 41, a second pressure plate 52 disposed at the other end of the bending moving mold 41, and connecting parts disposed between the first pressure plate 51, the second pressure plate 52 and the moving seat 3 respectively. The lower horizontal surfaces of the first pressure plate 51 and the second pressure plate 52 are disposed below the lower horizontal surface of the bending moving mold 41. When the moving seat 3 drives the bending moving mold 41, the first pressure plate 51 and the second pressure plate 52 to move downward, the first pressure plate 51 and the second pressure plate 52 first contact and fix with the stainless steel material. Pressure sensors are respectively disposed on the lower end surfaces of the first pressure plate 51 and the second pressure plate 52. The lower end surfaces of the first pressure plate 51 and the second pressure plate 52 are respectively disposed below the lower horizontal surface of the bending moving mold 41. Their main function is to first contact and press and fix the stainless steel material to be processed when the moving seat 3 drives the whole device to move downward, so as to ensure the stability of the stainless steel material during the processing. Meanwhile, pressure sensors installed on the lower end faces of the first pressure plate 51 and the second pressure plate 52 can monitor the magnitude of the clamping force in real time, ensuring that the clamping force is within the range required by the process. The working principle is as follows: During the operation of the equipment, the moving seat 3 drives the bending moving mold 41, the first pressure plate 51 and the second pressure plate 52 to move downward as a whole. The first pressure plate 51 and the second pressure plate 52 first come into contact with the stainless steel material, and the appropriate clamping force is adjusted and maintained by the pressure sensors on the lower end faces to ensure the stability and safety of the stainless steel material during the processing.

[0028] Please refer to details. Figure 3 and Figure 4 The connecting component includes a sliding rod 6 fixedly connected to the first pressure plate 51 and the second pressure plate 52, a sliding hole adapted to the sliding rod 6 and disposed on the movable seat 3, a buffer sleeve 62 fixedly disposed on the inner wall of the sliding hole, a limiting retaining ring 61 fixedly disposed on the other end of the sliding rod 6, and a tension spring 63 disposed on the outer periphery of the sliding rod 6. The outer diameter of the limiting retaining ring 61 is smaller than the inner diameter of the sliding hole. The sliding hole is disposed on the movable seat 3 and adapted to the sliding rod 6, ensuring the sliding guidance of the sliding rod 6. The buffer sleeve 62 is fixedly disposed on the inner wall of the sliding hole, which can reduce the wear between the sliding rod 6 and the sliding hole and improve the service life of the connecting component. The limiting retaining ring 61 is fixedly disposed on the other end of the sliding rod 6, and its outer diameter is smaller than the inner diameter of the sliding hole, preventing the sliding rod 6 from coming out of the sliding hole during sliding and ensuring the stability of the connecting component. The tension spring 63 is disposed on the outer periphery of the sliding rod 6, which can provide a certain preload to ensure that the sliding rod 6 is always in contact with the sliding hole during the movement of the sliding rod 6 and avoids the phenomenon of empty stroke. When the first pressure plate 51 and the second pressure plate 52 need to move, they drive the sliding rod 6 to slide in the sliding hole. At the same time, the tension spring 63 ensures good contact between the sliding rod 6 and the sliding hole through pre-tightening force, ensuring that the sliding rod 6 will not come out of the sliding hole during the pressing process.

[0029] Please refer to details. Figure 2and Figure 4 One end of the tension spring 63 is fixedly connected to the movable seat 3, and the other end is fixedly connected to the upper surface of the first pressure plate 51 and the second pressure plate 52. When the movable seat 3 moves downwards, it causes the first pressure plate 51 and the second pressure plate 52 to press down and contact the stainless steel plate, thus pressing the stainless steel plate firmly and ensuring that it does not move during the bending process. As the movable seat 3 continues to move downwards until the bending moving mold 41 and the bending fixed mold 42 close, the tension spring 63 is compressed, producing a contraction effect. After the bending is completed, the tension spring 63 resets, pushing the first pressure plate 51 and the second pressure plate 52 upwards to return to their initial positions. The guide bushing 311 and the sliding hole ensure the straightness and stability of the sliding rod 6 during movement, ensuring the precise operation of the entire device. In terms of working principle, the downward movement of the movable seat 3 drives the first pressure plate 51 and the second pressure plate 52 to press down, so that the stainless steel plate is tightly attached to the bending moving mold 41. After the bending is completed, the tension spring 63 resets, so that the first pressure plate 51 and the second pressure plate 52 return to their initial positions. At the same time, the sliding rod 6 maintains linear movement under the guidance of the guide bushing 311 and the sliding hole, ensuring the normal operation of the equipment.

[0030] In this embodiment, during use, the hydraulic cylinder 8 pushes the movable seat 3 to move horizontally up and down via the connecting shaft 7, thereby driving the bending moving mold 41, which is fixedly connected to the movable seat 3, to move synchronously. The movable seat 3 drives the bending moving mold 41, the first pressure plate 51, and the second pressure plate 52 to move downward as a whole. The first pressure plate 51 and the second pressure plate 52 first contact the stainless steel material, and the appropriate clamping force is adjusted and maintained by the pressure sensor on the lower end face to ensure that no movement occurs during the bending process. The movable seat 3 continues to move downward until the bending moving mold 41 and the bending fixed mold 42 close, at which point the tension spring 63 is compressed, producing a contraction effect. After the bending is completed, the tension spring 63 resets, pushing the first pressure plate 51 and the second pressure plate 52 upward to return to the initial position. The guide bushing 311 and the sliding hole ensure the straightness and stability of the sliding rod 6 during the movement.

[0031] The above are preferred embodiments of this utility model. Those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments described above. Any obvious improvements, substitutions or modifications made by those skilled in the art based on this utility model shall fall within the protection scope of this utility model.

Claims

1. An adjustable anti-springback device for folding stainless steel sheets, characterized in that: It includes a support base (1), a support frame (2) fixedly disposed on the rear end face of the support base (1), a fixed base (81) fixedly connected to the support frame (2), a folding moving mold (41) disposed relative to the fixed base (81), a driving member for driving the folding moving mold (41), a folding fixed mold (42) fixedly connected to the support base (1) and disposed relative to the folding moving mold (41), and pressure plate assemblies respectively disposed on both sides of the folding moving mold (41); The driving component includes a linear actuator and a guide assembly for guiding the movement direction of the linear actuator.

2. The adjustable stainless steel sheet folding anti-springback device according to claim 1, characterized in that: The linear actuator includes a movable seat (3) fixedly connected to the folding moving mold (41), a connecting shaft (7) fixedly connected to the upper end face of the movable seat (3), an oil cylinder (8) coaxially arranged with the connecting shaft (7), and a fixed seat (81) for fixing the oil cylinder (8). The fixed seat (81) is fixedly connected to the support frame (2).

3. The adjustable stainless steel sheet folding anti-springback device according to claim 2, characterized in that: The guide assembly includes guide rods (31) slidably disposed on both sides of the movable seat (3), guide bushings (311) disposed at the connection between the movable seat (3) and the guide rods (31), and fixed supports (32) fixedly disposed at the connection between the upper end face of the guide rods (31) and the support frame (2). The fixed supports (32) are fixedly connected to the support frame (2), and the end of the guide rods (31) that is away from the fixed supports (32) is fixedly connected to the upper end face of the support seat (1).

4. The adjustable stainless steel sheet folding anti-springback device according to claim 3, characterized in that: The outer periphery of the guide bushing (311) is fixedly connected to the movable seat (3), and the inner wall of the guide bushing (311) is slidably connected to the guide rod (31).

5. An adjustable stainless steel sheet folding anti-springback device according to claim 4, characterized in that: The pressure plate assembly includes a first pressure plate (51) disposed at one end of the folding moving mold (41), a second pressure plate (52) disposed at the other end of the folding moving mold (41), and connecting members disposed between the first pressure plate (51), the second pressure plate (52) and the moving seat (3), respectively. The lower horizontal surfaces of the first pressure plate (51) and the second pressure plate (52) are disposed below the lower horizontal surface of the folding moving mold (41), and pressure sensors are respectively disposed on the lower end surfaces of the first pressure plate (51) and the second pressure plate.

6. An adjustable stainless steel sheet folding anti-springback device according to claim 5, characterized in that: The connecting component includes a sliding rod (6) fixedly connected to the first pressure plate (51) and the second pressure plate (52), a sliding hole on the movable seat (3) adapted to the sliding rod (6), a buffer bushing (62) fixedly disposed on the inner wall of the sliding hole, a limiting retaining ring (61) fixedly disposed on the other end of the sliding rod (6), and a tension spring (63) disposed on the outer periphery of the sliding rod (6).

7. An adjustable stainless steel sheet folding anti-springback device according to claim 6, characterized in that: The outer diameter of the limiting retaining ring (61) is smaller than the inner diameter of the sliding hole.

8. An adjustable stainless steel sheet folding anti-springback device according to claim 7, characterized in that: One end of the tension spring (63) is fixedly connected to the movable seat (3), and the other end is fixedly connected to the upper end face of the first pressure plate (51) and the second pressure plate (52).

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