Opening Chinese prickly ash sorting screen set

Abstract

The utility model belongs to the technical field of opened Chinese prickly ash sorting screens, and relates to an opened Chinese prickly ash sorting screen mesh group which comprises a shaking frame, a first screen mesh is installed on the upper portion of a cavity of a shaking frame body, a second screen mesh is installed on the lower portion of the cavity of the shaking frame body, and a cleaning assembly is installed on the shaking frame and comprises a shaking groove. First moving blocks are arranged in each shaking groove in a sliding mode at equal intervals, the first moving blocks are fixedly connected through first connecting rods, a second moving block is arranged on one side of each first moving block, a scraping plate is installed between each set of first moving blocks and each set of second moving blocks, a first discharging hopper is installed on one side of the shaking frame, and a second discharging hopper is installed on the other side of the shaking frame. A second discharging hopper is installed at one end of the shaking frame, and auxiliary assemblies are installed on the first discharging hopper and the second discharging hopper. According to the utility model, the cleaning component and the auxiliary component are matched for operation, so that the effect of cleaning the screen plate during operation is realized, the machine does not need to be stopped, and the smoothness of the discharge port is ensured.

Description

Technical Field

[0001] This utility model belongs to the technical field of open-mouth pepper selection sieves, and relates to an open-mouth pepper selection sieve assembly. Background Technology

[0002] When processing dried Sichuan peppercorns in batches, it is necessary to use sieves to classify and screen the peppercorns to ensure effective screening of peppercorn shells and seeds, and to meet the classification requirements of peppercorns of different qualities.

[0003] For example, application number "CN202121270787.5" discloses a pepper sorting screen assembly, which describes that "it includes a first screen arranged at an inclination, on which a first pepper stalk separation zone and a large particle impurity separation zone are sequentially arranged from the feed end to the discharge end; a second screen is arranged at an inclination below the first screen, with the feed end of the second screen located below the large particle impurity separation zone and the discharge end of the second screen located below the first pepper stalk collection zone; a second pepper stalk collection zone is also arranged below the second screen; a third screen is arranged at an inclination below the second screen; the feed end of the third screen is located below the discharge end of the second screen; this utility model can effectively separate large particle impurities, pepper stalks, and pepper seeds from pepper raw materials, and the first pepper stalk transmission channel is connected between the first screen and the third screen, and the pepper stalk transmission channel is connected between the second screen and the third screen to realize the centralized collection and processing of various impurities, thereby improving the pepper sorting efficiency and accuracy."

[0004] When using the above technology, the following technical problems were found in the existing technology: During operation, the size of pepper shells, pepper seeds and other impurities is random, which can cause them to get stuck in the mesh of the screen, making the screening operation ineffective and unsustainable. The machine needs to be stopped to clean the screen, which affects the efficiency of the screening operation. In addition, the discharge position of the screen may be obstructed due to the lightness of the pepper shells. Utility Model Content

[0005] The technical problem this utility model aims to solve is that, in the existing technology, the size of pepper shells, pepper seeds, and other impurity particles is random, which can cause them to get stuck in the mesh of the screen, making the screening operation ineffective and unsustainable. The machine needs to be stopped to clean the screen, which affects the efficiency of the screening operation. Furthermore, the discharge point of the screen may experience uneven discharge due to the light weight of the pepper shells.

[0006] This utility model discloses a screening sieve assembly for selecting Sichuan peppercorns, comprising a shaking frame. A first sieve is installed at the upper part of the shaking frame cavity, and a second sieve is installed at the lower part of the shaking frame cavity. A cleaning component is installed on the shaking frame, and the cleaning component includes shaking grooves. Shaking grooves are symmetrically formed on both sides of the inner wall of the shaking frame cavity below the first and second sieves. A moving block is equidistantly slidably arranged inside each shaking groove. Each moving block is fixedly connected to the other by a connecting rod. A sliding hole is formed at the end of each moving block near the outer side of the shaking frame, and a connecting rod is arranged in the sliding hole. Each side of the frame is provided with a second moving block. One end of the second moving block is sleeved outside the cross-section of the first connecting rod through a sliding hole. The other end of the second moving block is fixedly sleeved on the rod body of the second connecting rod at equal intervals. The first moving block inside the shaking groove on both sides forms a group, and the remaining moving blocks are arranged in groups in sequence. The first second moving block inside the shaking groove on both sides forms a group, and the remaining second moving blocks are arranged in groups in sequence. A scraper is fixedly connected between each group of first moving blocks and between each group of second moving blocks. A first discharge hopper is installed on one side of the shaking frame, and a second discharge hopper is installed on one end of the shaking frame. Auxiliary components are installed on the first discharge hopper and the second discharge hopper.

[0007] Preferably, a connecting spring is connected to a first moving block located at one end of the swaying groove, and the end of the connecting spring is connected to the inner wall of the swaying groove. A first magnetic ring is installed on the vertical structural surface of each first moving block away from the first discharge hopper at the sliding hole position. Second magnetic rings are fixedly sleeved on the second connecting rod at equal intervals, and the second magnetic ring farthest from the first discharge hopper is fixed at the end of the second connecting rod.

[0008] Preferably, a pulling groove is provided on the vertical structural surface of the swaying frame on which the first discharge hopper is installed. The pulling groove is connected to the swaying groove. A pulling block is slidably arranged in the pulling groove. When the working end of the pulling block is completely placed in the groove of the pulling groove, the second moving block can move along the first connecting rod between the two first moving blocks. A moving hole is provided on the structural surface of the swaying frame with the pulling groove. The moving hole is connected to the swaying groove. A push handle is fixed to the side of the second magnet ring near the moving hole. The push handle extends outward through the moving hole.

[0009] Preferably, when the push handle is at its furthest position from the first discharge hopper, the second moving block is in contact with the first moving block at the corresponding position, and at this time, the second magnetic ring furthest from the first discharge hopper is in contact with the inner wall end face of the moving hole. The connecting spring does not deform, and the pulling block can enter the shaking groove from the pulling groove and contact the second moving block at the nearest position. The scraper on each group of first moving blocks is in contact with the second moving block.

[0010] Preferably, the auxiliary component includes a first shaking plate and a second shaking plate. The first shaking plate is symmetrically installed in the discharge chamber of the first discharge hopper via a fixed axis. The inner walls on both sides of the cavity of the first shaking plate are symmetrically connected with first shaking springs. The end of each first shaking spring is connected to the first shaking plate at the corresponding position. The first shaking spring does not deform when it is not in operation, and the distance between the first shaking plates is the shortest at this time. A guide plate is fixedly connected to the top of the first screen inside the shaking frame cavity, and the working end of the guide plate is located in the discharge chamber of the first discharge hopper.

[0011] Preferably, a second rocking plate is symmetrically installed in the discharge chamber of the second discharge hopper via a fixed axis, and a second rocking spring is symmetrically connected to the inner wall surface on both sides of the second discharge hopper cavity. The end of each second rocking spring is connected to the second rocking plate at the corresponding position. The second rocking spring does not deform when it is not in operation, and the distance between the second rocking plates is shortest at this time.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] By using the cleaning components, the bottom of the screen plate is scraped and cleaned, achieving a cleaning effect and preventing screen blockage that could prevent the screening operation from being carried out effectively and continuously. This eliminates the need to stop the machine and ensures the efficiency of the screening operation.

[0014] With the help of auxiliary components, the peppercorn shells and seeds that are not rolling smoothly at the discharge position can be automatically moved to ensure that the discharge port is unobstructed. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0016] Figure 2 This is a structural schematic diagram of the installation position of the second screen in this utility model.

[0017] Figure 3 This is a schematic diagram of the structure of the cleaning component in this utility model when it is not in operation.

[0018] Figure 4 This is a schematic diagram of the cleaning component during operation in this utility model.

[0019] Figure 5 This utility model Figure 3 A magnified structural diagram of point A in the middle.

[0020] Figure 6 This is a structural schematic diagram of the installation position of the No. 1 magnet ring in this utility model.

[0021] In the diagram: 1. Shaking frame; 2. First screen; 3. Second screen; 4. Shaking trough; 5. Moving block No. 1; 6. Connecting rod No. 1; 7. Moving block No. 2; 8. Connecting rod No. 2;

[0022] 9. Magnet ring No. 1; 10. Magnet ring No. 2; 11. Connecting spring; 12. Pulling groove;

[0023] 13. Pull block; 14. Moving hole; 15. Push handle; 16. Scraper; 17. First discharge hopper; 18. First shaking plate; 19. First shaking spring; 20. Second discharge hopper; 21. Second shaking plate; 22. Second shaking spring. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0025] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0026] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0027] Example 1

[0028] like Figures 1-6As shown, an open-face peppercorn selection sieve assembly includes a shaking frame 1, which is a rectangular frame with a central cavity for mounting the sieves. A first sieve 2 is installed slightly above the cavity, and a second sieve 3 is installed slightly below the cavity. The second sieve 3 and the first sieve 2 are bolted to the shaking frame 1. The frame of the shaking frame 1 is connected to the support structure of the screening equipment via a connector. The drive motor in the screening equipment provides power for the shaking of the shaking frame 1. A cleaning assembly is installed on the shaking frame 1, which includes shaking grooves 4. Shaking grooves 4 are symmetrically formed on the inner walls of both sides of the cavity below the first sieve 2 and the second sieve 3. A moving block 5 is equidistantly slidably arranged inside each shaking groove 4. Each moving block 5 is fixedly connected to the others by a connecting rod 6. A sliding hole is provided at the end of the outer side of the shaking frame 1, and a second connecting rod 8 is provided in the sliding hole. A second moving block 7 is provided on one side of each first moving block 5. One end of the body of the second moving block 7 is sleeved outside the cross section of the first connecting rod 6 through the sliding hole. The other end of the body of the second moving block 7 is fixedly sleeved on the body of the second connecting rod 8 at equal intervals. The first first moving block 5 inside the shaking grooves on both sides is a group, and the remaining first moving blocks 5 are arranged in groups in sequence. The first second moving block 7 inside the shaking grooves on both sides is a group, and the remaining second moving blocks 7 are arranged in groups in sequence. A scraper 16 is fixedly connected between each group of first moving blocks 5 and between each group of second moving blocks 7. A first discharge hopper 17 is installed on one side of the shaking frame 1, and a second discharge hopper 20 is installed at one end of the shaking frame 1. Auxiliary components are installed on the first discharge hopper 17 and the second discharge hopper 20. When the second moving block 7 and the first moving block 5 approach each other, their scrapers 16 fit together, which can prevent the material on the screen from getting stuck in the gap between the scrapers 16. The first moving block 5 and the second moving block 7 have the same vertical cross-sectional dimensions.

[0029] A connecting spring 11 is connected to the first moving block 5 located at one end of the shaking groove 4. The end of the connecting spring 11 is connected to the inner wall of the shaking groove 4. (When the shaking frame 1 shakes back and forth, the stretching and compression of the spring 11 will occur alternately, and a reaction force will be generated. The reaction force can ensure that the scraper 16 will not move excessively at the bottom of the screen plate, and avoid the phenomenon of collision between the structural components of the cleaning component and the shaking frame 1.) A first magnetic ring 9 is installed at the sliding hole position on the vertical structural surface of each first moving block 5 away from the first discharge hopper 17. Second magnetic rings 10 are fixedly sleeved at equal intervals on the second connecting rod 8. The second magnetic ring 10 farthest from the first discharge hopper 17 is fixed at the end of the second connecting rod 8. The distance of half the deformation of the connecting spring 11 is greater than half the distance between the two first moving blocks 5. When the second magnetic ring 10 and the first magnetic ring 9 are in contact, the distance between the second moving block 7 and the adjacent first moving block 5 is the same.

[0030] A pull groove 12 is provided on the vertical structural surface of the shaking frame 1 where the first discharge hopper 17 is installed. (The pull groove 12 provides movement space for the pull block 13. When the working end of the pull block 13 is inserted into the shaking groove 4, the cleaning component is locked. After the working end of the pull block 13 is fully pulled into the pull groove 12, the cleaning component is unlocked.) The pull groove 12 is connected to the shaking groove 4. The pull block 13 is slidably arranged in the pull groove 12. (The horizontal cross-section of the pull block 13 is T-shaped and can be divided into three parts: the first part is a handheld moving block located outside the pull groove 12; the second part is a connecting block; and the third part is a working end block that can lock the cleaning component. The working end block is fixed to the connecting block, and the connecting block is fixed to the handheld moving block.) When the working end of the pulling block 13 is completely placed in the groove of the pulling groove 12 (i.e., not inserted into the shaking groove 4), the second moving block 7 can move along the first connecting rod 6 between two adjacent first moving blocks 5. The shaking frame 1 has a moving hole 14 on its structural surface with the pulling groove 12. (The moving hole 14 can limit the moving position of the push handle 15 and ensure the moving direction of the push handle 15.) The moving hole 14 is connected to the shaking groove 4. The push handle 15 is fixed to the side of the second magnet ring 10 near the moving hole 14. (The overall shape of the push handle 15 is a cuboid, and the position where it is connected to the second magnet ring 10 is annular and slidably sleeved outside the cross section of the second connecting rod 8.) The push handle 15 extends out of the outside through the moving hole 14. After the pull block 13 is inserted into the shaking groove 4, the movement trajectory of the second moving block 7 intersects with the stationary position of the pull block 13. When the second moving block 7 is in contact with the first moving block 5 at the corresponding position, the pull block 13 comes into contact with the second moving block 7 at the nearest position, ensuring that the second moving block 7, the second connecting rod 8 and the second magnetic ring 10 are in a stationary state.

[0031] When the push handle 15 is at its furthest position from the first discharge hopper 17, the second moving block 7 is in contact with the corresponding first moving block 5. At this time, the second magnetic ring 10, which is furthest from the first discharge hopper 17, is in contact with the inner wall end face of the moving hole 14. The connecting spring 11 does not deform. The pulling block 13 can enter the shaking groove 4 from the pulling groove 12 and contact the nearest second moving block 7. The scraper 16 on each set of first moving blocks 5 is in contact with the second moving block 7. The two scrapers 16 are attached together to reduce the obstruction effect on the screen holes on the screen plate and avoid excessive interference with the operation of the screen holes when the scrapers 16 are stationary. Therefore, when the scrapers 16 are not in operation, they are attached together to ensure the normal operation of the screen holes. After the working end of the pulling block 13 enters the interior of the pulling groove 12, the second moving block 7 can slide along the interior of the shaking groove 4. The pushing handle 15 fixed on the second magnetic ring 10 can apply a pushing force to the second connecting rod 8 and the second moving block 7, so that the first magnetic ring 9 and the corresponding second magnetic ring 10 are attracted to each other, so that the scrapers 16 are evenly distributed under the screen plate, and the first moving block 5, the first connecting rod 6, the second moving block 7 and the second connecting rod 8 are combined into a whole that can move together.

[0032] During operation, thanks to the structural design of the cleaning component, if clogging occurs in the mesh of the first screen 2 and the second screen 3, a pulling force can be applied to the pulling block 13 of the pulling groove 12. The working end of the pulling block 13 completely enters the interior of the pulling groove 12, thus releasing the restrictive structure. Then, a pushing force is applied to the second connecting rod 8 through the pushing handle 15 in the moving hole 14. The second connecting rod 8 drives the second magnetic ring 10 and the second moving block 7 to slide along the first connecting rod 6, so that the second magnetic ring 10 and the first magnetic ring 9 on the corresponding position of the first moving block 5 attract each other, making the distance between the scraper 16 on the second moving block 7 and the first moving block 5 the same. Without stopping the machine, the cleaning component moves along the shaking groove 4. The connecting springs 11 at both ends of the shaking groove 4 will continuously change during contraction and extension, allowing the cleaning component to move back and forth along the bottom of the screen plate, achieving scraping and cleaning of the bottom of the screen plate during the screening process without stopping the machine to deal with the clogging, ensuring that the screening operation is effective and continuous.

[0033] Example 2

[0034] like Figure 1The auxiliary components include a first shaking plate 18 and a second shaking plate 21. The first shaking plate 18 is symmetrically installed in the discharge chamber of the first discharge hopper 17 via a fixed axis. First shaking springs 19 are symmetrically connected to the inner walls on both sides of the cavity of the first shaking plate 18. The end of each first shaking spring 19 is connected to the corresponding first shaking plate 18. When the first shaking springs 19 are not in operation, they do not deform, and the distance between the first shaking plates 18 is shortest at this time. When the two first shaking springs 19 are stretched to their maximum distance, the two first shaking plates 18 do not contact each other, and the bottom end face of the first shaking plate 18 is tangent to the bottom end face of the inner wall of the cavity of the first discharge hopper 17. A guide plate is fixedly connected inside the cavity of the shaking frame 1 at the top of the first screen 2, and the working end of the guide plate is located in the discharge chamber of the first discharge hopper 17.

[0035] The discharge chamber of the second discharge hopper 20 is symmetrically equipped with second rocking plates 21 along a fixed axis. Second rocking springs 22 are symmetrically connected to the inner walls on both sides of the chamber. The end of each second rocking spring 22 is connected to a corresponding second rocking plate 21. When the second rocking springs 22 are not in operation, they do not deform, and the distance between the second rocking plates 21 is at its shortest at this time. When the two second rocking springs 22 are stretched to their maximum distance, the two second rocking plates 21 do not contact each other, and the bottom end face of the second rocking plate 21 is tangent to the bottom end face of the inner wall of the second discharge hopper 20 chamber.

[0036] (When the shaking frame 1 is installed on the main body of the equipment, it is set at an angle. At the lower end of the angle, there is a first discharge port and a second discharge port of the shaking frame 1. On the outer side of the lower end of the shaking frame 1, there is a first discharge hopper 17 and a second discharge hopper 20. The first discharge hopper 17 is connected to the first discharge port, and the second discharge hopper 20 is connected to the second discharge port, so that the material left on the first screen 2 is discharged from the first discharge hopper 17 after passing through the first discharge port, and the material left on the second screen 3 is discharged from the second discharge hopper 20 after passing through the second discharge port.)

[0037] To ensure smooth material discharge, the bottom surfaces of the first screen 2, the first discharge port, and the first discharge hopper 17 are all in the same plane, and the bottom surfaces of the second screen 3, the second discharge port, and the second discharge hopper 20 are all in the same plane.

[0038] The second discharge hopper 20 is formed by a bottom plate and two side walls forming a material guiding channel. The side walls form a V-shaped opening at the end of the bottom plate, and vertical mounting holes are provided on the side walls. A vertical rotating shaft is provided at one end of the second shaking plate 21, which extends into the mounting hole so that the second shaking plate 21 can rotate around the shaft. A second shaking spring 22 is installed between the other end of the second shaking plate 21 and the side wall. The second shaking spring 22 enables the second shaking plate 21 to continuously reciprocate around the shaft within a small range when subjected to external force, thereby sweeping the material accumulated on the second discharge hopper 20.

[0039] During operation, thanks to the structural design of the auxiliary components, the screened material is discharged through the first discharge hopper 17 and the second discharge hopper 20 during the screening process. Under the effect of the shaking frame 1, the first shaking plate 18 and the second shaking plate 21 will shake accordingly. The stretching and compression of the first shaking spring 19 and the second shaking spring 22 will generate a reaction force, so that the first shaking plate 18 and the second shaking plate 21 are always in a back-and-forth swinging state, which sweeps away the material that is not rolling smoothly at the discharge port of the first discharge hopper 17 and the second discharge hopper 20, ensuring that the discharge port is unobstructed.

[0040] The descriptions of the orientation and relative positional relationships of the structure in this utility model, such as descriptions of front, back, left, right, up, and down, do not constitute a limitation on this utility model, but are merely for the convenience of description.

Claims

1. A screening sieve assembly for selecting open-mouthed Sichuan peppercorns, characterized in that: The system includes a shaking frame (1), a first screen (2) installed at the upper part of the frame body cavity of the shaking frame (1), a second screen (3) installed at the lower part of the frame body cavity of the shaking frame (1), a cleaning assembly installed on the shaking frame (1), the cleaning assembly including a shaking groove (4), and shaking grooves (4) symmetrically opened on both sides of the inner wall surface of the frame body cavity of the shaking frame (1) below the first screen (2) and the second screen (3). A first moving block (5) is equidistantly slidably arranged inside each shaking groove (4), and each first moving block (5) is fixedly connected to each other by a first connecting rod (6). A sliding hole is opened at the end of each first moving block (5) near the outer side of the shaking frame (1), and a second connecting rod (8) is arranged in the sliding hole. A second moving block (7) is arranged on one side of each first moving block (5). One end of the body of the second moving block (7) is fitted outside the cross section of the first connecting rod (6) through a sliding hole. The other end of the body of the second moving block (7) is fixedly fitted on the rod of the second connecting rod (8) at equal intervals. The first moving block (5) inside the shaking groove (4) on both sides is a group, and the remaining moving blocks (5) are arranged in groups in sequence. The first moving block (7) inside the shaking groove (4) on both sides is a group, and the remaining moving blocks (7) are arranged in groups in sequence. A scraper (16) is fixedly welded between each group of moving blocks (5) and between each group of moving blocks (7). A first discharge hopper (17) is installed on one side of the shaking frame (1), and a second discharge hopper (20) is installed at one end of the shaking frame (1). Auxiliary components are installed on the first discharge hopper (17) and the second discharge hopper (20).

2. The open-face peppercorn selection screen assembly according to claim 1, characterized in that: A connecting spring (11) is connected to a first moving block (5) located at one end of the shaking groove (4). The end of the connecting spring (11) is connected to the inner wall of the shaking groove (4). A first magnetic ring (9) is installed on the vertical structural surface of each first moving block (5) away from the first discharge hopper (17) at the sliding hole position. A second magnetic ring (10) is fixedly sleeved on the second connecting rod (8) at equal intervals. The second magnetic ring (10) farthest from the first discharge hopper (17) is fixed at the end position of the second connecting rod (8).

3. The open-face peppercorn selection screen assembly according to claim 2, characterized in that: The vertical structural surface of the shaking frame (1) on which the first discharge hopper (17) is installed is provided with a pulling groove (12). The pulling groove (12) is connected to the shaking groove (4). A pulling block (13) is slidably arranged in the pulling groove (12). When the working end of the pulling block (13) is completely placed in the groove of the pulling groove (12), the second moving block (7) can move along the first connecting rod (6) between the two first moving blocks (5). A moving hole (14) is provided on the structural surface of the shaking frame (1) where the pulling groove (12) is provided. The moving hole (14) is connected to the shaking groove (4). A push handle (15) is fixedly connected to the side of the second magnet ring (10) near the moving hole (14). The push handle (15) extends out to the outside through the moving hole (14).

4. The open-face peppercorn selection screen assembly according to claim 3, characterized in that: When the push handle (15) is at its farthest position from the first discharge hopper (17), the second moving block (7) is in contact with the corresponding first moving block (5), and at this time the second magnetic ring (10) farthest from the first discharge hopper (17) is in contact with the inner wall end face of the moving hole (14), the connecting spring (11) does not deform, the pulling block (13) can enter the shaking groove (4) from the pulling groove (12) and contact the nearest second moving block (7), and each group of first moving blocks (5) is in contact with the scraper (16) on the second moving block (7).

5. The open-face peppercorn selection screen assembly according to claim 1, characterized in that: The auxiliary components include a first shaking plate (18) and a second shaking plate (21). The first shaking plate (18) is symmetrically installed in the discharge chamber of the first discharge hopper (17) through a fixed axis. The inner walls on both sides of the cavity of the first shaking plate (18) are symmetrically connected with first shaking springs (19). The end of each first shaking spring (19) is connected to the first shaking plate (18) at the corresponding position. The first shaking spring (19) does not deform when it is not in operation, and the distance between the first shaking plates (18) is the shortest at this time. The cavity of the shaking frame (1) is fixed with a guide plate at the top of the first screen (2), and the working end of the guide plate is located in the discharge chamber of the first discharge hopper (17).

6. The open-face peppercorn selection screen assembly according to claim 1, characterized in that: The discharge chamber of the second discharge hopper (20) is symmetrically equipped with a second rocking plate (21) through a fixed axis. The inner walls on both sides of the cavity of the second discharge hopper (20) are symmetrically connected with second rocking springs (22). The end of each second rocking spring (22) is connected to the second rocking plate (21) at the corresponding position. The second rocking spring (22) does not deform when it is not in operation, and the distance between the second rocking plates (21) is the shortest at this time.

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