Screw locking device for circuit board
By introducing electric sliders and angle adjustment components into the automatic screw lock machine, combining material suction, power, positioning and buffering components, the problem that the automatic screw lock machine cannot adjust the position of the lock screw is solved, and the lock screw efficiency and product quality are improved. Accurate installation and automated operation of screws are achieved.
Patent Information
- Application Number
- CN202421166541.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-27
- Publication Date
- 2025-01-07
- Estimated Expiration
- 2034-05-27
AI Technical Summary
The existing automatic screw locking machine cannot adjust the position of the locking screws on the circuit board, resulting in inefficient locking screws.
A circuit board locking screw device including a support plate, a locking screw mechanism and an adjustment component is designed. Through the movement and angle adjustment components of the electric slider on the electric guide rail, the position and angle adjustment of the locking screw mechanism are adjusted, and combined with the material suction component. , power components, positioning components and buffering components to ensure accurate installation of screws.
It improves the efficiency and product quality of the lock screws, ensures the correct installation position and angle of the screws, realizes automatic absorption and installation of the screws on the circuit board, and enhances the operating reliability of the device.
Smart Images

Figure CN222307944U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of circuit board screw locking, in particular to a circuit board screw locking device. Background Art
[0002] The automatic screw locking machine uses various electric and pneumatic components to realize the automatic conveying, tightening, and detection of screws. The equipment simplifies the screw tightening process, reduces the number of manual labor and reduces the adverse factors caused by manual misoperation. It is a typical non-standard automation equipment.
[0003] Automatic screw locking machines are mainly divided into: handheld screw locking machines, multi-axis automatic screw locking machines, and coordinate automatic screw locking machines. Automatic screw locking machines are mainly used to lock M1-M8 screws. Because it is a non-standard automation equipment with customizable characteristics, products involving screw fastening can obtain corresponding solutions, and its application field is relatively wide.
[0004] Traditional automatic screw locking devices all use a screw locking mechanism to first align the hole position, and then directly use a cylinder to press down the electric screwdriver to lock the screw, and use the cylinder to control the depth. However, when locking screws on a circuit board, it is necessary to lock screws at different positions on the circuit board. The existing automatic screw locking device cannot adjust the position of the circuit board to lock the screws, thereby reducing the efficiency of locking screws on the circuit board. Utility Model Content
[0005] The utility model aims to solve the above-mentioned technical problems and provide a circuit board screw locking device which can adjust the position of the screws on the circuit board and improve the efficiency of screw locking.
[0006] In view of this, the utility model provides a circuit board screw locking device, comprising:
[0007] Support plate;
[0008] A screw locking mechanism is provided on the support plate and is used to lock the screws of the circuit board;
[0009] An adjustment component is arranged at the rear side of the support plate and is used to adjust the position of the screw locking mechanism on the circuit board screws;
[0010] The adjustment components include:
[0011] A mounting plate, located at the rear side of the support plate;
[0012] Positioning holes are opened around the mounting plate;
[0013] An electric guide rail is arranged on the mounting plate;
[0014] The electric slider is arranged on the electric guide rail, and the electric slider is connected with the support plate.
[0015] In the above technical solution, further, the electric slider is connected to the support plate through an angle adjustment component, and the angle adjustment component includes:
[0016] A universal seat, arranged at the front side of the electric slider;
[0017] Ear plates are arranged at the upper and lower ends of the front side of the universal seat;
[0018] A support shaft is arranged between the two ear plates;
[0019] A rotating member is rotatably arranged on the supporting shaft;
[0020] A connecting shaft is arranged on the left and right sides of the rotating member;
[0021] A connecting plate, arranged on the connecting shaft;
[0022] The connecting seat is arranged between the front sides of the two connecting plates, and the connecting seat is connected to the supporting plate.
[0023] In any of the above technical solutions, further, the screw locking mechanism includes a material suction component and a power component, the material suction component and the power component are located on the support plate, and the power component is used to drive the material suction component to move and suck the screw.
[0024] In any of the above technical solutions, further, the suction component includes:
[0025] A slide rail is arranged on the front side of the support plate;
[0026] A movable seat is slidably arranged on the upper side of the slide rail;
[0027] A vacuum pump is disposed on the movable base;
[0028] Air pipe, connected to the vacuum pump;
[0029] The screw nozzle is arranged at the lower end of the trachea and is connected with the trachea.
[0030] In any of the above technical solutions, further, the power assembly includes:
[0031] The cylinder is arranged on the top of the supporting plate, and the cylinder piston rod is connected with the moving seat.
[0032] In any of the above technical solutions, further, a positioning component is included, and the positioning component includes:
[0033] A fixed seat, arranged at the lower side of the slide rail;
[0034] A guide plate, arranged at the front side of the fixing seat;
[0035] A guide groove is provided on the guide plate, the air pipe passes through and extends out of the guide groove, and the air pipe is slidably connected to the guide groove;
[0036] A camera is arranged on the guide plate, and is used to monitor the distance between the screw mouth and the screw hole on the circuit board in real time, and convert the monitored changes into electrical signals;
[0037] The programmable logic controller is electrically connected to the camera, receives the electrical signal sent by the camera, performs data processing on the electrical signal, and controls the operating state of the cylinder.
[0038] In any of the above technical solutions, further, a buffer component is included, and the buffer component includes:
[0039] A fixing plate, arranged on the left and right sides of the front of the supporting plate;
[0040] A guide rod is arranged on the fixed plate;
[0041] The sliding plate is arranged on the left and right sides of the moving seat, and the sliding plate is slidably connected with the guide rod;
[0042] The buffer spring is sleeved on the guide rod and arranged between the fixed plate and the slide plate.
[0043] The beneficial effects of the utility model are:
[0044] 1. Through the movement of the electric slider on the electric guide rail, the position of the support plate can be fine-tuned in the horizontal direction to ensure that the screw locking mechanism is accurately positioned on the circuit board, thereby improving production efficiency and product quality;
[0045] 2. By rotating the rotating part, the support plate rotates, thereby adjusting the angle of the screw locking mechanism to adapt to screw locking at different angles. In this way, the position of the circuit board screw locking screw can be accurately adjusted as needed to ensure the correct installation position and angle of the screw;
[0046] 3. The cylinder piston rod drives the moving seat to move along the slide rail, and the vacuum pump and the screw nozzle move along with it at the same time, maintaining the connection with the air pipe to ensure that the suction is always available. The screw nozzle moves to contact the screw, and the screw is sucked by the suction provided by the air pipe. After the screw is sucked, the device can continue to perform subsequent actions, so that the automatic suction and installation of the screws on the circuit board can be realized, which improves the production efficiency and product quality;
[0047] 4. The camera monitors the distance between the screw mouth and the screw hole on the circuit board in real time, and converts the monitored changes into electrical signals. The programmable logic controller receives the electrical signals sent by the camera and processes the signals. According to the processed data, the programmable logic controller controls the operating status of the cylinder to ensure the accurate positioning and action execution of the screw mouth, ensure the correct absorption and installation of the screws, and improve production efficiency and product quality.
[0048] 5. When the screw mouth is tightening the screws on the circuit board, if there is a sudden stop or change of movement direction, the buffer spring will play a buffering role, absorb part of the impact force, and reduce the vibration of the device. The device can more effectively deal with emergencies or unstable factors during movement, thereby improving the operating efficiency and reliability of the device. BRIEF DESCRIPTION OF THE DRAWINGS
[0049] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;
[0050] Figure 2 This is a schematic diagram of the three-dimensional structure of the angle adjustment component of the utility model;
[0051] Figure 3 This is a three-dimensional structural diagram of the screw locking mechanism of the utility model;
[0052] Figure 4 It is a system framework diagram of the positioning component of the utility model;
[0053] The accompanying drawings are marked as follows: 1. support plate; 2. screw locking mechanism; 3. adjustment assembly; 31. mounting plate; 32. positioning hole; 33. electric guide rail; 34. electric slider; 4. angle adjustment assembly; 41. universal seat; 42. ear plate; 43. support shaft; 44. rotating part; 45. connecting shaft; 46. connecting plate; 47. connecting seat; 5. suction assembly; 51. slide rail; 52. moving seat; 53. vacuum pump; 54. air pipe; 55. screw mouth; 6. power assembly; 61. cylinder; 7. positioning assembly; 71. fixed seat; 72. guide plate; 73. guide groove; 74. camera; 75. programmable logic controller; 8. buffer assembly; 81. fixed plate; 82. guide rod; 83. slide plate; 84. buffer spring. DETAILED DESCRIPTION
[0054] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.
[0055] In the description of the present application, it should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. For ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.
[0056] Embodiment 1:
[0057] like Figure 1 and Figure 2 As shown, this embodiment provides a circuit board screw locking device, including:
[0058] Support plate 1;
[0059] The screw locking mechanism 2 is arranged on the support plate 1 and is used to lock the screws of the circuit board;
[0060] The adjustment component 3 is arranged at the rear side of the support plate 1 and is used to adjust the position of the screw locking mechanism 2 on the circuit board screws;
[0061] The adjustment component 3 comprises:
[0062] The mounting plate 31 is located at the rear side of the supporting plate 1;
[0063] Positioning holes 32 are provided around the mounting plate 31;
[0064] The electric guide rail 33 is arranged on the mounting plate 31;
[0065] The electric slider 34 is disposed on the electric guide rail 33 , and the electric slider 34 is connected to the support plate 1 .
[0066] In the present technical solution, the support plate 1 provides a stable foundation for subsequent screw locking operations. The screw locking mechanism 2 is arranged on the support plate 1 and is used to perform screw locking operations on the circuit board. The adjustment component 3 is arranged on the rear side of the support plate 1, and its function is to adjust the position of the screw locking mechanism 2 on the circuit board to ensure that the screw is correctly installed on the circuit board. The mounting plate 31 is located on the rear side of the support plate 1, and serves as the main supporting structure of the adjustment component 3. The positioning holes 32 are opened around the mounting plate 31 to ensure the stable installation of the adjustment component 3 and provide a reference point for adjusting the position of the screw locking mechanism 2. The electric guide rail 33 is arranged on the mounting plate 31, allowing the electric slider 34 to move in the horizontal direction, thereby realizing the adjustment of the position of the screw locking mechanism 2. The electric slider 34 is arranged on the electric guide rail 33 and is connected to the support plate 1. When the electric slider 34 moves on the guide rail, it will carry the support plate 1 together to adjust the position of the screw locking mechanism 2.
[0067] During operation, the mounting plate 31 is fixedly installed at the designated position by passing the bolts through the positioning holes 32, and then the screw locking mechanism 2 is started to start the screw locking operation on the screws on the circuit board. If the position of the screw locking mechanism 2 needs to be adjusted, the operator can move the support plate 1 by manipulating the adjustment component 3 to adjust the position of the screw locking mechanism 2. By moving the electric slider 34 on the electric guide rail 33, the position of the support plate 1 can be fine-tuned in the horizontal direction to ensure that the screw locking mechanism 2 is accurately positioned on the circuit board. After the adjustment is completed, the screw locking mechanism 2 can continue to lock the screws on the circuit board until all the screws are installed. The operator then closes the screw locking mechanism 2 and the electric guide rail 33, thereby ensuring that the screw locking mechanism 2 is accurately positioned on the circuit board, thereby improving production efficiency and product quality.
[0068] Embodiment 2:
[0069] This embodiment provides a circuit board screw locking device, which, in addition to the technical solutions of the above embodiments, also has the following technical features.
[0070] like Figure 1 and Figure 2 As shown, in this embodiment, the electric slider 34 is optimized to be connected to the support plate 1 through an angle adjustment component 4, and the angle adjustment component 4 includes:
[0071] A universal seat 41, disposed on the front side of the electric slider 34;
[0072] Ear plates 42 are arranged at upper and lower ends of the front side of the universal seat 41;
[0073] A support shaft 43 is disposed between the two ear plates 42;
[0074] A rotating member 44 is rotatably disposed on the support shaft 43;
[0075] The connecting shaft 45 is arranged on the left and right sides of the rotating member 44;
[0076] A connecting plate 46 is disposed on the connecting shaft 45;
[0077] The connecting seat 47 is disposed between the front sides of the two connecting plates 46 , and the connecting seat 47 is connected to the supporting plate 1 .
[0078] In the present technical solution, the angle adjustment component 4 connects the electric slider 34 and the support plate 1. When the angle of the support plate 1 needs to be adjusted, the operator can achieve it by manipulating the angle adjustment component 4. By rotating the rotating member 44, the connecting shaft 45 and the connecting plate 46 will rotate accordingly, and the connecting plate 46 drives the connecting seat 47 to rotate, and the connecting seat 47 drives the support plate 1 to rotate, thereby changing the angle of the support plate 1 and adjusting the angle of the screw locking mechanism 2 at the same time to adapt to locking screws at different angles. Once adjusted to the desired angle, the angle adjustment component 4 is locked to ensure that the support plate 1 remains in the corresponding position. After the adjustment is completed, the circuit board screw locking device can continue to perform the screw locking operation to ensure the accurate installation of the screws. In this way, the position of the circuit board screw locking device can be accurately adjusted according to needs, thereby ensuring the correct installation position and angle of the screws.
[0079] Embodiment 3:
[0080] This embodiment provides a circuit board screw locking device, which, in addition to the technical solutions of the above embodiments, also has the following technical features.
[0081] like Figure 1 and Figure 3 As shown, in this embodiment, the optimized screw locking mechanism 2 includes a material suction component 5 and a power component 6, the material suction component 5 and the power component 6 are located on the support plate 1, and the power component 6 is used to drive the material suction component 5 to move and suck the screw.
[0082] In the present technical solution, the screw locking mechanism 2 of the device is composed of a suction component 5 and a power component 6, which are located on the support plate 1 and work together to achieve the suction and installation of the screws.
[0083] like Figure 1 , Figure 3 and Figure 4 As shown, in this embodiment, the optimized suction component 5 includes:
[0084] The slide rail 51 is arranged on the front side of the support plate 1;
[0085] The movable seat 52 is slidably arranged on the upper side of the slide rail 51;
[0086] A vacuum pump 53 is disposed on the movable seat 52;
[0087] an air pipe 54 connected to the vacuum pump 53;
[0088] The screw nozzle 55 is disposed at the lower end of the air pipe 54 and is communicated with the air pipe 54 .
[0089] In the present technical solution, the suction assembly 5 includes a slide rail 51, a moving seat 52, a vacuum pump 53, an air pipe 54 and a screw nozzle 55. The vacuum pump 53 is installed on the moving seat 52 and is connected to the vacuum pump 53 through the air pipe 54 to generate suction. The screw nozzle 55 is arranged at the lower end of the air pipe 54 and is connected to the air pipe 54 to suck the screw.
[0090] like Figure 1 and Figure 3 As shown, in this embodiment, the power assembly 6 is optimized to include:
[0091] The cylinder 61 is disposed on the top of the support plate 1 , and the piston rod of the cylinder 61 is connected to the moving seat 52 .
[0092] In the present technical solution, the power assembly 6 includes a cylinder 61 , which is disposed on the top of the support plate 1 . The piston rod of the cylinder 61 is connected to the moving seat 52 , providing power to drive the suction assembly 5 to move.
[0093] During operation: When the circuit board needs to be screwed, the operator positions the device at the position where it needs to be locked, the operator starts the power assembly 6, the cylinder 61 starts to run, the piston rod of the cylinder 61 drives the moving seat 52 to move along the slide rail 51, and the vacuum pump 53 on the moving seat 52 moves along at the same time, maintaining the connection with the air pipe 54 to ensure that the suction force is always available. During the movement, the screw mouth 55 on the moving seat 52 contacts the screw and absorbs the screw through the suction provided by the air pipe 54. When the screw is absorbed, the moving seat 52 stops moving, the cylinder 61 stops running, and the suction assembly 5 remains in the position of sucking the screw. After the screw is absorbed, the device can continue to perform subsequent actions, such as screw installation or other operations. In this way, the automatic absorption and installation of screws on the circuit board can be realized, which improves production efficiency and product quality.
[0094] Embodiment 4:
[0095] This embodiment provides a circuit board screw locking device, which, in addition to the technical solutions of the above embodiments, also has the following technical features.
[0096] like Figure 1 and Figure 3 As shown, in this embodiment, the optimization further includes a positioning component 7, and the positioning component 7 includes:
[0097] A fixing seat 71 is disposed on the lower side of the slide rail 51;
[0098] A guide plate 72 is disposed on the front side of the fixing seat 71;
[0099] A guide groove 73 is formed on the guide plate 72, and the air pipe 54 passes through and extends out of the guide groove 73, and the air pipe 54 is slidably connected to the guide groove 73;
[0100] The camera 74 is disposed on the guide plate 72 and is used to monitor the distance between the screw mouth 55 and the screw hole on the circuit board in real time and convert the monitored changes into electrical signals;
[0101] The programmable logic controller 75 is electrically connected to the camera 74 , receives the electrical signal sent by the camera 74 , performs data processing on the electrical signal, and controls the operating state of the cylinder 61 .
[0102] In the present technical solution, the positioning component 7 ensures that the screw mouth 55 can be accurately aligned with the screw hole on the circuit board and maintain the correct position when sucking or installing the screw. The camera 74 is used to monitor the distance between the screw mouth 55 and the screw hole on the circuit board in real time, and convert the monitored changes into electrical signals. The programmable logic controller 75 is electrically connected to the camera 74, receives the electrical signals sent by the camera 74, and performs data processing on these signals. According to the processed data, the programmable logic controller 75 controls the operating state of the cylinder 61 to ensure the accurate positioning of the screw mouth 55 and the execution of the action. During operation, the camera 74 monitors the distance between the screw mouth 55 and the screw hole on the circuit board in real time. When the screw mouth 55 needs to move, the camera 74 converts the monitored changes into electrical signals and transmits them to the programmable logic controller 75. The programmable logic controller 75 processes the received signal data and determines whether the cylinder 61 needs to be operated to adjust the position of the screw mouth 55. If adjustment is required, the programmable logic controller 75 controls the operating state of the cylinder 61 so that the piston rod of the cylinder 61 pushes the screw mouth 55 on the moving seat 52 for accurate positioning. Once the screw mouth 55 is accurately aligned with the screw hole, the device can continue to perform the screw suction or installation operation to complete the task of locking the screws of the circuit board. Through the function of the positioning component 7, the device can achieve accurate positioning of the screw hole, ensure the correct suction and installation of the screw, and improve production efficiency and product quality.
[0103] Embodiment 5:
[0104] This embodiment provides a circuit board screw locking device, which, in addition to the technical solutions of the above embodiments, also has the following technical features.
[0105] like Figure 1 and Figure 3 As shown, in this embodiment, the optimization further includes a buffer component 8, and the buffer component 8 includes:
[0106] The fixing plate 81 is arranged on the left and right sides of the front part of the supporting plate 1;
[0107] A guide rod 82 is disposed on the fixing plate 81;
[0108] The slide plate 83 is disposed on the left and right sides of the movable seat 52, and the slide plate 83 is slidably connected to the guide rod 82;
[0109] The buffer spring 84 is sleeved on the guide rod 82 and disposed between the fixing plate 81 and the sliding plate 83 .
[0110] In the present technical solution, when the screw mouth 55 is tightening the screws on the circuit board, the sliding connection between the slide plate 83 and the guide rod 82 on the movable seat 52 enables it to move smoothly along the direction of the guide rod 82. During the movement, if a sudden stop or a change in the moving direction occurs, the buffer spring 84 will play a buffering role, absorb part of the impact force, and reduce the vibration of the device, so that the impact and vibration can be reduced when the movable seat 52 moves horizontally. Such a design can ensure that the movement process of the movable seat 52 is smoother during the operation of the device, thereby improving the stability of the device and the reliability of operation. By adding the buffer component 8, the device can more effectively deal with emergencies or unstable factors during movement, thereby improving the operating efficiency and work reliability of the device.
[0111] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.
Claims
1. Circuit board screw locking device, characterized in that: include: Support plate (1); A screw locking mechanism (2), arranged on the support plate (1), and used for locking screws on the circuit board; An adjustment component (3), arranged on the rear side of the support plate (1), and used for adjusting the position of the screw locking mechanism (2) on the circuit board screws; The adjustment component (3) comprises: A mounting plate (31), located at the rear side of the support plate (1); Positioning holes (32) are formed around the mounting plate (31); An electric guide rail (33) is arranged on the mounting plate (31); An electric slider (34) is arranged on the electric guide rail (33), and the electric slider (34) is connected to the support plate (1).
2. The circuit board screw locking device according to claim 1, characterized in that: The electric slider (34) is connected to the support plate (1) via an angle adjustment component (4), and the angle adjustment component (4) comprises: A universal seat (41) is arranged on the front side of the electric slider (34); Ear plates (42) are arranged at the upper and lower ends of the front side of the universal seat (41); A support shaft (43) is arranged between the two ear plates (42); A rotating member (44) rotatably disposed on the support shaft (43); A connecting shaft (45) is arranged on the left and right sides of the rotating member (44); A connecting plate (46) is arranged on the connecting shaft (45); A connecting seat (47) is arranged between the front sides of the two connecting plates (46), and the connecting seat (47) is connected to the supporting plate (1).
3. The circuit board screw locking device according to claim 1, characterized in that: The screw locking mechanism (2) comprises a material suction component (5) and a power component (6), wherein the material suction component (5) and the power component (6) are located on the support plate (1), and the power component (6) is used to drive the material suction component (5) to move the suction screw.
4. The circuit board screw locking device according to claim 3, characterized in that: The material suction component (5) comprises: A slide rail (51) is arranged on the front side of the support plate (1); A movable seat (52) is slidably arranged on the upper side of the slide rail (51); A vacuum pump (53) is disposed on the movable seat (52); An air pipe (54) connected to the vacuum pump (53); The screw nozzle (55) is arranged at the lower end of the air pipe (54) and is communicated with the air pipe (54).
5. The circuit board screw locking device according to claim 4, characterized in that: The power assembly (6) comprises: The cylinder (61) is arranged on the top of the support plate (1), and the piston rod of the cylinder (61) is connected to the movable seat (52).
6. The circuit board screw locking device according to claim 5, characterized in that: The invention also comprises a positioning component (7), wherein the positioning component (7) comprises: A fixing seat (71) is arranged on the lower side of the slide rail (51); A guide plate (72) is arranged on the front side of the fixing seat (71); A guide groove (73) is formed on the guide plate (72), the air pipe (54) passes through and extends out of the guide groove (73), and the air pipe (54) is slidably connected to the guide groove (73); A camera (74) is disposed on the guide plate (72) and is used to monitor the distance between the screw mouth (55) and the screw hole on the circuit board in real time and convert the monitored changes into electrical signals; A programmable logic controller (75) is electrically connected to the camera (74), receives an electrical signal sent by the camera (74), performs data processing on the electrical signal, and controls the operating state of the cylinder (61).
7. The circuit board screw locking device according to claim 4, characterized in that: Also included is a buffer component (8), the buffer component (8) comprising: A fixing plate (81) is arranged on the left and right sides of the front of the support plate (1); A guide rod (82) is arranged on the fixing plate (81); A slide plate (83) is arranged on the left and right sides of the movable seat (52), and the slide plate (83) is slidably connected to the guide rod (82); A buffer spring (84) is sleeved on the guide rod (82) and is arranged between the fixing plate (81) and the sliding plate (83).