Eel size sorting device

Abstract

The application relates to the technical field of aquaculture equipment of the aquatic product industry, improves the low ejection efficiency of existing eel size screening, and discloses an eel size sorting device which comprises a rack, a fish storage box and a plurality of screening boxes, the screening boxes are arranged on the rack in a ladder shape in sequence, the fish storage box is communicated with the screening box farthest from the ground, a screening plate is arranged in the screening box, the screening plate is provided with a plurality of fish falling grooves, one end of each of the adjacent screening boxes is provided with a through groove, a fish discharging groove pipe for receiving eels is arranged on the side of the screening plate far from the fish storage box, and one end of the fish discharging groove pipe penetrates out of the screening box and is communicated with the outside. The eels can swim into the screening box, the eels larger than the width of the fish falling grooves swim on the surface of the screening plate, enter the fish discharging groove pipe, swim out of the outside, the eels smaller than the requirement of the layer fall into the bottom of the screening box through the fish falling grooves, swim into the adjacent screening plate, and the process is repeated in sequence, so that eels of different sizes are screened into corresponding culture ponds.

Description

Technical Field

[0001] This application relates to the technical field of aquaculture equipment, and in particular to a device for sorting eels by size. Background Technology

[0002] In the process of eel factory farming, due to different growth rates, eels need to be graded and screened to separate eels of different sizes for farming. This is to avoid situations where larger eels prey on smaller ones and compete with each other for food. At the same time, it also allows eels of different sizes to absorb the nutrients they should have at their growth stage, thereby improving the quality of eel farming.

[0003] To improve eel sorting efficiency, an existing eel sorting device includes a sieve for screening eels, a frame for mounting the sieve, and a collection tank for collecting the eels. Below the sieve is a receiving chamber for receiving the eels, and at the bottom of the receiving chamber is a discharge pipe for transporting the eels to the collection tank. During sorting, eels of similar size are passed through sieves corresponding to different sizes. The eels enter the receiving chamber through the gaps in the sieves, and then flow along the discharge pipe into different collection tanks for temporary holding, thus obtaining eels of different sizes. After sorting, the eels are manually removed and transferred to a dedicated fish-raising pond for further feeding.

[0004] Regarding the aforementioned technologies, when using them, eels are poured into the separator from one end, and workers move the eels along the length of the separator to make them swim into the corresponding gaps in the sieves. This process generally requires multiple workers to push the eels forward and move them into the gaps in turn, which is inefficient. Summary of the Invention

[0005] To address the issue of low efficiency in sorting eels by size in existing technologies, this application provides an eel size sorting device.

[0006] The following technical solution is adopted:

[0007] An eel size sorting device includes a frame, a fish storage box, and several sorting boxes. The sorting boxes are arranged in a stepped manner on the frame. The fish storage box is located on the frame and is connected to the sorting box furthest from the ground. A sorting plate is provided inside the sorting box. The sorting plate has several fish dropping channels for eels smaller than the required volume of that layer to pass through. Each of the adjacent ends of several sorting boxes has a through groove for the eels to swim into the next level of the sorting plate. A fish discharge channel is provided on the side of the sorting plate away from the fish storage box for receiving eels. One end of the fish discharge channel extends out of the sorting box and communicates with the outside.

[0008] By adopting the above technical solution, the eel swarm is introduced into the fish storage box. The eels swim from the fish storage box to the connected screening box. Due to the setting of the width of the fish dropping trough, eels larger than the width of the fish dropping trough will swim on the surface of the screening plate and enter the fish discharge trough pipe. They will then swim out to the corresponding breeding pond outside through the fish discharge trough pipe. Eels smaller than the required size will fall to the bottom of the screening box through the fish dropping trough and then swim into the adjacent screening plate. This process is repeated in turn, thereby screening eels of different sizes into the corresponding breeding ponds.

[0009] Optionally, the machine body is provided with a water pipe along its length to supply water to the surface of the sieve plate, and the water pipe is provided with a number of water outlets at intervals along its length.

[0010] By adopting the above technical solution, a moist environment is provided on the surface of the sieve plate, which not only maintains the moisture on the surface of the eel but also makes it easier for the eel to swim. At the same time, the water flows down the fish trough into the sieve box, which also provides a moist environment for the bottom of the sieve box.

[0011] Optionally, a sliding rod is slidably connected in the sieve box, and a driving assembly for driving the sliding rod to move is provided in the sieve box. The sliding rod is arranged perpendicular to the length direction of the fish dropping trough. Several diversion plates for separating eel groups are vertically rotatably connected to the side of the sliding rod near the sieve plate. A swinging assembly for controlling the reciprocating swinging of the diversion plates is provided on the sliding rod.

[0012] By adopting the above technical solution, the sliding rod moves along the length of the screening box, thereby driving the diversion plate to move along the swimming direction of the eel group. At the same time, the diversion plate swings left and right along the axis under the drive of the swing component, separating the eel group, making the eel activity more uniform, and preventing small eels from being blocked by large eels in the feed chute and being carried into the fish discharge chute pipe that the large eels want to swim into. At the same time, when the angle of the eel entering the fish discharge chute is not right, the diversion plate can move the eel and make it slide into the fish discharge chute.

[0013] Optionally, the drive assembly includes a screw and a moving block. The screw is rotatably connected to one side of the sieve box along the moving direction of the sliding rod. The moving block is disposed at one end of the sliding rod. The screw passes through the moving block and is threadedly engaged with the moving block. One end of the screw is connected to a drive component that drives the screw to rotate.

[0014] By adopting the above technical solution, the sliding rod is driven to move along the swimming direction of the eel school through the cooperation of the screw and the moving block. The screw is driven to rotate by the driving component, and the moving block is threadedly engaged with the screw. When the screw rotates, it drives the moving block to move along the length of the screw, thereby driving the sliding rod to move.

[0015] Optionally, the drive assembly further includes a balance bar and a balance block. The balance block is disposed at one end of the sliding bar away from the moving block, and the balance bar is disposed parallel to the screw on the other side of the sieve box. The balance block is slidably connected to the balance bar.

[0016] By adopting the above technical solution, and through the cooperation of the balance block and the balance rod, the screw can move more stably when driving the sliding rod.

[0017] Optionally, the swing assembly includes a rotating column, a connecting rod, and a connecting block. The connecting block is connected to one end of the diverter plate. The rotating column is rotatably connected to the sliding rod. One end of the connecting rod is connected to the rotating column, and the other end is provided with a control column. The connecting block has a control groove along its length. The control column is slidably connected to the control groove. The sliding rod is provided with a linkage assembly that drives a plurality of rotating columns to rotate.

[0018] By adopting the above technical solution, the rotating column drives the connecting rod to move. Since the control column is installed in the control groove, when the connecting rod moves, it drives the control column to abut against the inner wall of the control groove, thereby pushing the connecting block to move. The connecting block is fixed to the diverter plate. The control groove is opened along the length of the connecting block, so that the diverter plate only performs a certain angle of reciprocating swing motion.

[0019] Optionally, the linkage assembly includes a plurality of driven gears, a driving gear, and a drive belt. The plurality of driven gears are coaxially connected to the corresponding rotating column. The drive belt is provided with teeth corresponding to the driven gears and the driving gear. The driving gear and the plurality of driven gears are driven by the drive belt. The driving gear is rotatably connected to the sliding rod through a connecting shaft. A drive gear is provided on the connecting shaft. A rack is provided on the inner wall of the sieve box along the moving direction of the sliding rod. The drive gear meshes with the rack.

[0020] By adopting the above technical solution, the drive gear meshes with the rack and moves through the sliding rod, causing the rack and drive gear to move relative to each other, so that the drive gear rotates. The drive gear drives the connecting shaft to rotate, thereby driving the drive gear to rotate. The drive gear and several driven gears are driven by the drive belt, thereby driving several driven gears to rotate, causing several rotating columns to rotate, so as to drive the flow divider plate to move.

[0021] Optionally, the moving block is provided with telescopic rods at both ends, and the moving block is connected to the sliding rod through the telescopic rods. The telescopic rod is fitted with an elastic element, so that the sliding rod always tends to move away from the moving block. The inner wall of the sieve box is provided with a guide groove that allows the sliding rod to move closer to or away from the moving block, and the sliding rod is provided with a guide rod that can slide within the guide groove.

[0022] By adopting the above technical solution, the moving block is connected to the sliding rod via a telescopic rod. The screw drives the moving block to move, thereby driving the sliding rod to move. In the initial moving state, the sliding rod moves against the direction of the eel school's swimming. At this time, the drive gear meshes with the rack, and the movement of the sliding rod causes the diverting plate to swing. When the sliding rod needs to return, due to the cooperation of the guide groove and the guide rod, the sliding rod is driven to move away from the moving block. At this time, the drive gear separates from the rack. When the moving block returns, the sliding rod will not drive the diverting plate to swing. At the same time, there is a gap between the diverting plate and the screening plate to prevent the diverting plate from harming the eels when it returns.

[0023] In summary, this application includes at least one of the following beneficial effects:

[0024] 1. Eels swim from the storage box to the connected sorting box. Eels larger than the width of the fish drop trough will swim on the surface of the sorting plate and enter the fish discharge trough pipe. They will then swim out to the corresponding breeding pond outside through the fish discharge trough pipe. Eels smaller than the required size will fall to the bottom of the sorting box through the fish drop trough and then swim into the adjacent sorting plate. This process is repeated to improve the efficiency of sorting eels by size and save manpower.

[0025] 2. The sliding rod moves under the drive of the drive assembly, and the diverter plate swings left and right along the axis under the drive of the swing assembly, separating the eel group and preventing small eels from being carried into the same layer of fish discharge trough pipe by large eels, thereby improving the accuracy of separating eels of different sizes. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of this embodiment;

[0027] Figure 2 This is a partial cross-sectional structural schematic diagram of this embodiment;

[0028] Figure 3 This is a schematic diagram of the swing assembly structure;

[0029] Figure 4 This is a schematic diagram of the linkage component structure;

[0030] Figure 5 This is a schematic diagram of the driver component structure.

[0031] Explanation of reference numerals in the attached diagram: 1. Frame; 2. Conveyor pipe; 3. Water pipe; 4. Fish storage box; 41. Connecting groove; 42. Diverter plate; 5. Screening box; 51. Connecting bar; 511. Rack; 512. Guide groove; 513. Screw; 514. Driving component; 515. Balance bar; 52. Screening plate; 521. Fish drop trough; 53. Through groove; 54. Fish discharge trough pipe; 6. Sliding rod; 61. Moving block; 611. Telescopic rod; 612. Elastic component; 62. Balance block; 63. Connecting sleeve; 641. Driving gear; 642. Drive gear; 643. Drive belt; 65. Rotating column; 651. Driven gear; 652. Connecting rod; 653. Control column; 654. End block; 66. Guide rod; 7. Diverter plate; 71. Connecting shaft; 711. Limiting ring; 72. Connecting block; 721. Control groove. Detailed Implementation

[0032] The following is in conjunction with the appendix Figure 1 To be continued Figure 5 This application will be described in further detail.

[0033] Reference Figure 1 and Figure 3 This application discloses an eel size sorting device, including a frame 1, a fish storage box 4, and several sorting boxes 5. The sorting boxes 5 are horizontally arranged and sequentially arranged in a stepped manner on the frame 1. The fish storage box 4 is located at the end of the frame 1. A connecting groove 41 is formed through one side of the bottom of the fish storage box 4 to allow eels to enter the sorting boxes 5. The connecting groove 41 is connected to the sorting box 5 farthest from the ground. A diverting plate 42 is covered on the fish storage box 4 over the connecting groove 41. The diverting plate 42 has two diverting ports for the eels to swim out. The upper parts of the fish storage box 4 and the sorting boxes 5 are connected. The fish storage box 4 is connected to the eel conveying pipe 2 of the previous process. The upper part of the middle of the sorting box 5 is covered with a sorting plate 52 parallel to the ground. The fish drop troughs 521 in the sieve plates 52 gradually decrease in size from top to bottom. The fish outlet pipe can be connected to the corresponding pipe to send the eels to the corresponding breeding pond. The sieve plates 52 have several fish drop troughs 521 for eels smaller than the required volume of that layer to pass through. The fish drop troughs 521 are set along the swimming direction of the eel group and are parallel to each other. The bottom sidewalls of several sieve boxes 5 are all connected by through grooves 53 for eels to swim into the next sieve plate 52. The bottom inner wall of the sieve box 5 is inclined. On the side of the sieve plate 52 away from the fish storage box 4, there is a fish discharge trough pipe 54 for receiving eels. One end of the fish discharge trough pipe 54 passes through the sieve box 5 and communicates with the outside. The end of the fish discharge trough pipe 54 that passes through the outer wall of the sieve box 5 is connected to the fish outlet pipe, which is connected to the corresponding breeding pond.

[0034] Reference Figure 1 and Figure 2Several sieve boxes 5 have water pipes 3 laid along their length on their inner walls to supply water to the surface of the sieve plate 52. The water pipes 3 are spaced apart along their length to provide a number of water outlets. This provides a humid environment for the surface of the sieve plate 52, which helps maintain the moisture on the eel's body surface and makes it easier for the eel to swim. At the same time, the water flows down the fish trough 521 into the sieve box 5, which also provides a humid environment for the bottom of the sieve box 5.

[0035] Reference Figures 2 to 4 A sliding rod 6 is slidably connected in the screening box 5. The sliding rod 6 is a rectangular hollow rod. A drive assembly for moving the sliding rod 6 is installed inside the screening box 5. The sliding rod 6 is set perpendicular to the length direction of the fish dropping trough 521. Several diversion plates 7 for separating the eel groups are vertically rotatably connected to the side of the sliding rod 6 near the screening plate 52. A swing assembly is installed on the sliding rod 6 to control the swinging of the diversion plates 7 left and right along the axis of rotation. The sliding rod 6 moves along the length direction of the screening box 5, thereby driving the diversion plates 7 to move along the swimming direction of the eel group. At the same time, the diversion plates 7 swing left and right along the axis under the drive of the swing assembly, separating the eel group, making the movement of the eels more uniform, and preventing small eels from being blocked by large eels in the dropping trough and being swept into the fish discharge pipe 54 into which the large eels want to swim. At the same time, when the angle of the eel entering the fish dropping trough 521 is not right, the diversion plates 7 can push the eel, allowing the eel to slide into the fish dropping trough 521.

[0036] Reference Figure 4 and Figure 5 Specifically, the drive assembly includes a screw 513 and a moving block 61. Two side walls of the sieve box 5 extend upwards parallel to the fish drop trough 521 to form connecting strips 51. The sides of the connecting strips 51 that are close to each other are concave. The screw 513 is rotatably connected along the length of the connecting strips 51. The moving block 61 is located at one end of the sliding rod 6. The screw 513 passes through the moving block 61 and is threadedly engaged with it. One end of the screw 513 is connected to a drive component 514, which is a stepper motor, to drive the screw 513 to rotate. The cooperation of the screw 513 and the moving block 61 drives the sliding rod 6 to move along the direction of the eel school's swimming. The screw 513 is driven to rotate by the drive component 514. The moving block 61 is threadedly engaged with the screw 513. When the screw 513 rotates, it drives the moving block 61 to move along the length of the screw 513, thereby moving the sliding rod 6.

[0037] Reference Figure 4 and Figure 5 The drive assembly also includes a balance bar 515 and a balance block 62. The balance block 62 is located at the end of the sliding rod 6 away from the moving block 61. The balance bar 515 is parallel to the screw 513 and is located in the connecting strip 51 on the other side. The balance bar 515 passes through the balance block 62, allowing the balance block 62 to slide in a slidable connection with the balance bar 515. Through the cooperation between the balance block 62 and the balance bar 515, the screw 513 can move more stably when driving the sliding rod 6.

[0038] Reference Figures 2 to 4 The oscillating assembly includes a rotating column 65, a connecting rod 652, and a connecting block 72. The connecting block 72 is connected to one end of the diverter plate 7. The diverter plate 7 is a rectangular strip with rounded corners on both sides. A connecting shaft 71 extends from one side along its length. The connecting shaft 71 passes through a sliding rod 6. A connecting sleeve 63 for connecting the connecting shaft 71 is provided in the sliding rod 6. The connecting shaft 71 is provided with a limiting ring 711 to prevent it from detaching from the connecting sleeve 63. The connecting shaft 71 is located away from the sieve plate 52. A connecting block 72 is fixedly connected to the end of the diverter plate 7, extending along the side length of the diverter plate 7. A rotating column 65 is rotatably connected to the sliding rod 6. One end of the connecting rod 652 is perpendicularly connected to the rotating column 65, and the other end is vertically provided with a control column 653. A control groove 721 is opened along the length direction of the connecting block 722, and the control column 653 is slidably connected in the control groove 721. An end block 654 is also provided at the end of the control column 653 that passes through the control groove 721. The sliding rod is provided with a linkage component that drives several rotating columns 65 to rotate. The rotation of the rotating column 65 drives the connecting rod 652 to move. Since the control column 653 passes through the control groove 721, when the connecting rod 652 moves, it drives the control column 653 to abut against the inner wall of the control groove 721, thereby pushing the connecting block 72 to move. The connecting block 72 is fixedly connected to the diverter plate 7, and the control groove 721 is opened along the length direction of the connecting block 72, so that the diverter plate 7 only performs a certain angle of reciprocating swing motion.

[0039] Reference Figures 2 to 4 The linkage assembly includes several driven gears 651, a driving gear 641, and a drive belt 643. The driven gears 651 are coaxially connected to the corresponding rotating column 65. The drive belt 643 is provided with teeth corresponding to the driven gears 651 and the driving gear 641. The driving gear 641 and the several driven gears 651 are driven by the drive belt 643. The driving gear 641 is rotatably connected to the sliding rod 6 through a connecting shaft. A driving gear 642 is provided on the connecting shaft. A rack 511 is provided on the inner wall of the sieve box 5 along the moving direction of the sliding rod 6. The driving gear 642 meshes with the rack 511. The drive gear 642 meshes with the rack 511 and moves through the sliding rod 6, causing the rack 511 and the drive gear 642 to move relative to each other, so that the drive gear 642 rotates. The drive gear 642 drives the connecting shaft to rotate, thereby driving the drive gear 641 to rotate. The drive gear 641 and several driven gears 651 are driven by the drive belt 643, thereby driving several driven gears 651 to rotate, causing several rotating columns 65 to rotate, so as to drive the flow divider 7 to move.

[0040] Reference Figure 5The movable block 61 has telescopic rods 611 at both ends, and the movable block 61 is connected to the sliding rod 6 via the telescopic rods 611. An elastic element 612 is fitted over the telescopic rods 611, ensuring that the sliding rod 6 always tends to move away from the movable block 61. The elastic element 612 is a spring. The inner wall of the screening box 5 has a guide groove 512 that allows the sliding rod 6 to move closer to or away from the movable block 61. The guide groove is racetrack-shaped at both ends. The sliding rod 6 has a guide rod 66 that can slide within the guide groove 512. The driving speed of the drive member 514 decreases when the sliding rod 6 approaches the end of the connecting bar 51, allowing the guide rod 66 to move within the guide groove 512. The balance block 62 has the same telescopic rods 611 and elastic elements 612, and the corresponding connecting bar 51 also has a guide groove 512. The movable block 61 is connected to the sliding rod 6 via the telescopic rod 611. The screw 513 drives the movable block 61 to move, thereby driving the sliding rod 6 to move. In the initial moving state, the sliding rod 6 moves in the opposite direction to the direction in which the eel school swims. At this time, the drive gear 642 meshes with the rack 511. The movement of the sliding rod 6 causes the diverter plate 7 to swing. When the sliding rod 6 needs to return, due to the cooperation of the guide groove 512 and the guide rod 66, the sliding rod 6 is driven to move away from the movable block 61. At this time, the drive gear 642 separates from the rack 511. When the movable block 61 returns, the sliding rod 6 will not drive the diverter plate 7 to swing. At the same time, there is a gap between the diverter plate 7 and the screen plate 52 to prevent the diverter plate 7 from harming the eels when it returns.

[0041] The implementation principle of the eel size sorting device in this application embodiment is as follows:

[0042] The eels are introduced into the storage box 4, from where they swim to the connected sorting box 5. Due to the width of the fish drop trough 521, eels larger than the trough will swim on the surface of the sorting plate 52 and enter the discharge pipe 54, from which they will swim out to their corresponding rearing pond. Eels smaller than the required size will fall through the fish drop trough 521 to the bottom of the sorting box 5 and then swim onto the adjacent sorting plate 52. Simultaneously, the sliding rod 6 moves along the length of the sorting box 5, thereby moving the diversion plate 7 along the direction of the eel movement. The diversion plate 7 also swings left and right along its axis under the action of the swinging component, separating the eels and making their movement more even. This prevents smaller eels from being blocked by larger eels in the feed trough and being swept into the discharge pipe 54, which is where the larger eels should swim. This process is repeated to sort eels of different sizes into their corresponding rearing ponds.

[0043] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A device for sorting eels by size, characterized in that: The system includes a frame (1), a fish storage box (4), and several sieve boxes (5). The several sieve boxes (5) are arranged in a stepped manner on the frame (1). The fish storage box (4) is arranged on the frame (1). The fish storage box (4) is connected to the sieve box (5) farthest from the ground. A sieve plate (52) is provided inside the sieve box (5). The sieve plate (52) has several fish drop troughs (521) for eels smaller than the required volume of that layer to pass through. One end of each of the several sieve boxes (5) is provided with a through groove (53) for eels to swim into the next level of the sieve plate (52). A fish discharge trough pipe (54) for receiving eels is provided on the side of the sieve plate (52) away from the fish storage box (4). One end of the fish discharge trough pipe (54) passes through the sieve box (5) and communicates with the outside; the frame (1) is laid with a water pipe (3) along the length direction to supply water to the surface of the sieve plate (52), and the water pipe (3) is provided with a number of water outlets at intervals along the length direction; a sliding rod (6) is slidably connected in the sieve box (5), and a driving component for driving the sliding rod (6) to move is provided in the sieve box (5). The sliding rod (6) is arranged perpendicular to the length direction of the fish drop trough (521), and a number of diversion plates (7) for separating eel groups are vertically rotatably connected to the side of the sliding rod (6) near the sieve plate (52). A swing component for controlling the reciprocating swing of the diversion plate (7) is provided on the sliding rod (6).

2. The eel size sorting device according to claim 1, characterized in that: The drive assembly includes a screw (513) and a moving block (61). The screw (513) is rotatably connected to one side of the sieve box (5) along the moving direction of the sliding rod (6). The moving block (61) is disposed at one end of the sliding rod (6). The screw (513) passes through the moving block (61) and is threadedly engaged with the moving block (61). One end of the screw (513) is connected to a drive member (514) that drives the screw (513) to rotate.

3. The eel size sorting device according to claim 2, characterized in that: The drive assembly also includes a balance bar (515) and a balance block (62). The balance block (62) is located at one end of the sliding rod (6) away from the moving block (61). The balance bar (515) is located parallel to the screw (513) on the other side of the sieve box (5). The balance block (62) is slidably connected to the balance bar (515).

4. The eel size sorting device according to claim 3, characterized in that: The swing assembly includes a rotating column (65), a connecting rod (652), and a connecting block (72). The connecting block (72) is connected to one end of the diverter plate (7). The rotating column (65) is rotatably connected to the sliding rod (6). One end of the connecting rod (652) is connected to the rotating column (65), and the other end is provided with a control column (653). The connecting block (72) has a control groove (721) along its length. The control column (653) is slidably connected in the control groove (721). The sliding rod (6) is provided with a linkage assembly that drives several rotating columns (65) to rotate.

5. The eel size sorting device according to claim 4, characterized in that: The linkage assembly includes several driven gears (651), a driving gear (641), and a drive belt (643). Several driven gears (651) are coaxially connected to the corresponding rotating column (65). The drive belt (643) is provided with tooth patterns corresponding to the driven gears (651) and the driving gear (641). The driving gear (641) and several driven gears (651) are driven by the drive belt (643). The driving gear (641) is rotatably connected to the sliding rod (6) through a connecting shaft. A drive gear (642) is provided on the connecting shaft. A rack (511) is provided on the inner wall of the sieve box (5) along the moving direction of the sliding rod (6). The drive gear (642) meshes with the rack (511).

6. The eel size sorting device according to claim 5, characterized in that: The movable block (61) is provided with telescopic rods (611) at both ends. The movable block (61) is connected to the sliding rod (6) through the telescopic rods (611). The telescopic rods (611) are covered with elastic members (612) so that the sliding rod (6) always tends to move away from the movable block (61). The inner wall of the sieve box (5) is provided with a guide groove (512) to make the sliding rod (6) approach or move away from the movable block (61). The sliding rod (6) is provided with a guide rod (66) that can slide in the guide groove (512).

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