A syringe piston hook assembly device

Abstract

The application discloses a syringe piston pull hook assembly device, and belongs to the technical field of medical instrument auxiliary devices.The syringe piston pull hook assembly device comprises a base frame, a material moving device, a clamping device, a clamping jaw and a ring-shaped workbench.A piston feeding mechanism is installed at the left end of the base frame, and an assembly mechanism is installed at the front end of the base frame.The clamping material moving mechanism comprises clamping assemblies and unlocking assemblies, and a plurality of clamping assemblies are fixedly connected with the ring-shaped workbench in a circumferential array, and two unlocking assemblies are fixedly connected with the base frame in a left-right symmetrical manner.Through the above mode, the syringe piston pull hook assembly device realizes the connection of the piston and the pull hook assembly operation through the cooperation of the ring-shaped workbench and the clamping material moving mechanism, greatly improves the assembly efficiency, and reduces the work burden of medical staff.Under the joint action of the clamping assemblies and the unlocking assemblies, the workpiece is quickly clamped, fixed and released, so that the assembly work is smoothly carried out.The assembly mechanism can conveniently and quickly complete the assembly work.

Description

Technical Field

[0001] The present invention relates to the technical field of medical instrument auxiliary devices, and in particular to a syringe piston draw hook assembly device. Background Art

[0002] A syringe is a commonly used medical device used to inject medications or liquids into human tissues or organs. It consists of a barrel, a piston, a needle, and a retractor. The piston pushes the medication or liquid out of the barrel, while the retractor secures or locks the piston to prevent accidental leakage or spillage during transport or storage. When the retractor is pulled, the piston is secured within the barrel, preventing the medication from flowing out.

[0003] In the medical field, since syringes are used in huge quantities and the assembly of syringe pistons and retractors is relatively cumbersome, the assembly of the pistons and retractors often takes up the time of medical staff and affects the progress of other work.

[0004] Based on this, the present invention designs a syringe piston hook assembly device to solve the above problems. Summary of the Invention

[0005] In view of the above-mentioned shortcomings of the prior art, the present invention provides a syringe piston hook assembly device.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] A syringe piston hook assembly device comprises a base frame, a material moving device, a clamping device, a clamping claw and an annular workbench;

[0008] The annular workbench is equipped with a clamping and moving mechanism, and a set of moving devices, clamping devices and clamping claws are respectively installed on the left and right ends of the base frame. The left end of the base frame is equipped with a piston feeding mechanism, and the front end of the base frame is equipped with an assembly mechanism. The clamping device is fixedly connected to the clamping claw.

[0009] The clamping and material-moving mechanism includes a clamping assembly and an unlocking assembly. Multiple groups of clamping assemblies are fixedly connected to the annular workbench in a circular array, and two groups of unlocking assemblies are fixedly connected to the base frame in a left-right symmetrical manner.

[0010] Furthermore, the piston feeding mechanism includes a linear feeding device, a visual monitoring device, a bracket, an annular chute, an adjustment turntable and an adjustment motor. The linear feeding device is installed at the left end of the base frame, the bracket is fixedly connected to the base frame, the upper and lower ends of the bracket are respectively fixedly installed with annular chute and an adjustment motor, the adjustment turntable is arranged in the annular chute, the output end of the adjustment motor is fixedly connected to the adjustment turntable, the visual monitoring device is fixedly installed on the bracket of the material moving device and aligned with the adjustment turntable, and the discharge port of the linear feeding device is aligned with the annular chute.

[0011] Furthermore, the clamping assembly includes a fixed block, a movable block, a clamping spring, a sliding shaft, a clamping head, a piston limiting groove, a mold table, a piston positioning groove and a piston positioning block. The two fixed blocks are fixedly connected to the annular workbench, the movable block is limited and slidingly connected to the fixed block, one end of the sliding shaft is fixedly connected to the movable block, and the other end of the sliding shaft is limited and slidingly connected to the fixed block. A clamping spring is fixedly installed between the fixed block and the movable block, and the near ends of the two movable blocks are respectively fixedly installed with clamping heads, and the clamping heads are provided with piston limiting grooves. A mold table is provided between the two fixed blocks and is fixedly connected to the annular workbench, a piston positioning groove is provided on the mold table, and a piston positioning block is fixedly installed in the piston positioning groove.

[0012] Furthermore, the piston limiting groove, the piston positioning groove and the piston positioning block are configured to be used in conjunction with the piston.

[0013] Furthermore, the unlocking assembly includes an unlocking cylinder, an unlocking claw, a fixed rod and a rotating sleeve. The unlocking cylinder is fixedly connected to the annular workbench, the output end of the unlocking cylinder is fixedly connected to the unlocking claw, and the rotating sleeve is rotatably connected to the fixed rod.

[0014] Furthermore, a fixing rod is fixedly installed on the upper end of the movable block.

[0015] Furthermore, the assembly mechanism includes an assembly component, a hook limiting groove, a bilateral conveying device, a hook mold, a hook positioning groove, a clamping device and a clamping claw. The bilateral conveying device is fixedly installed at the front end of the base frame. A plurality of hook molds are symmetrically fixedly installed on the two conveyor belts on the bilateral conveying device. The hook mold is provided with a hook positioning groove for use with the hook.

[0016] Furthermore, the assembly component includes a first fixed frame, a second fixed frame, a driving motor, a driving screw, a fixed slide rod, a slider, a lifting cylinder, an L-shaped connecting plate and a limit slide rod, the upper and lower ends of the first fixed frame are fixedly connected to the second fixed frame and the base frame respectively; two fixed slide rods are fixedly installed between the second fixed frame, and are rotatably connected to the driving screw through bearings; the driving motor is fixedly installed on the second fixed frame, and the output end of the driving motor is fixedly connected to the driving screw; the slider is threadedly connected to the driving screw through a threaded sleeve, and is limitedly and slidably connected to the fixed slide rod, the slider is fixedly connected to the lifting cylinder through a connecting plate, and the output end of the lifting cylinder is fixedly connected to the clamping device through an L-shaped connecting plate, and the limit slide rods are symmetrically fixedly installed on both sides of the lifting cylinder, and the limit slide rod is limitedly and slidably connected to the L-shaped connecting plate; the clamping jaws of the assembly mechanism are provided with a hook limit groove for use with the hook.

[0017] Beneficial effects

[0018] The syringe piston hook assembly device realizes the connection of the piston and hook assembly operations through the cooperation of the annular workbench and the clamping and transferring mechanism, greatly improving the assembly efficiency and reducing the workload of medical staff; the piston loading mechanism can adjust the piston orientation during the piston loading process, which is convenient for the next assembly operation; under the joint action of the clamping component and the unlocking component, the workpiece is quickly clamped, fixed and released, and it is ensured that the position of the workpiece does not shift during the transfer process, thereby ensuring the smooth progress of the assembly work; the assembly mechanism can conveniently and quickly complete the assembly of the piston and hook. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0020] Figure 1 The main structure of the syringe piston hook assembly device of the present invention is a three-dimensional Figure 1 ;

[0021] Figure 2 This is a front view of the structure of a syringe piston hook assembly device of the present invention;

[0022] Figure 3 This is a right side view of the structure of a syringe piston hook assembly device of the present invention;

[0023] Figure 4 The main structure of the syringe piston hook assembly device of the present invention is a three-dimensional Figure 2 ;

[0024] Figure 5 for Figure 1 Enlarged view of point A in the middle;

[0025] Figure 6 This is a schematic structural diagram of a draw hook mold of a syringe piston draw hook assembly device of the present invention;

[0026] Figure 7 for Figure 4 Enlarged view of point B in the middle.

[0027] The numbers in the figure represent:

[0028] 1. Base frame; 2. Clamping and material transfer mechanism; 21. Clamping assembly; 211. Fixed block; 212. Movable block; 213. Clamping spring; 214. Sliding shaft; 215. Clamping head; 216. Piston limiting groove; 217. Mold table; 218. Piston positioning groove; 219. Piston positioning block; 22. Unlocking assembly; 221. Unlocking cylinder; 222. Unlocking claw; 223. Fixed rod; 224. Rotating sleeve; 3. Piston feeding mechanism; 31. Linear feeding device; 32. Visual monitoring device; 33. Bracket; 34. Annular slide; 35. Adjusting turntable; 36. Adjusting motor; 4. Assembly mechanism; 41. Assembly component; 411. First fixed frame; 412. Second fixed frame; 413. Driving motor; 414. Driving screw; 415. Fixed slide; 416. Sliding block; 417. Lifting cylinder; 418. L-shaped connecting plate; 419. Limiting slide; 42. Draw hook limiting groove; 43. Double-sided conveying device; 44. Draw hook mold; 45. Draw hook positioning groove; 5. Material moving device; 6. Clamping device; 7. Clamping claw; 8. Annular workbench. DETAILED DESCRIPTION

[0029] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0030] The present invention will be further described below with reference to the embodiments.

[0031] In some embodiments, please refer to the appendix of the specification. Figure 1-7 , a syringe piston hook assembly device, comprising a base frame 1, a material moving device 5, a clamping device 6, a clamping claw 7 and an annular workbench 8;

[0032] A clamping and moving mechanism 2 is installed on the annular workbench 8. A set of moving devices 5, a clamping device 6 and a clamping claw 7 are installed on the left and right ends of the base frame 1 respectively. A piston feeding mechanism 3 is installed on the left end of the base frame 1. An assembly mechanism 4 is installed at the front end of the base frame 1. The clamping device 6 is fixedly connected to the clamping claw 7.

[0033] The clamping and material-moving mechanism 2 includes a clamping assembly 21 and an unlocking assembly 22. Multiple groups of clamping assemblies 21 are fixedly connected to the annular workbench 8 in a circular array, and two groups of unlocking assemblies 22 are fixedly connected to the base frame 1 in a bilaterally symmetrical manner.

[0034] When the syringe piston hook assembly device is working normally, the left end, front end and right end of the annular workbench 8 are respectively the loading station, assembly station and unloading station. The piston loading mechanism 3 moves the piston to the base frame 1 and adjusts the piston direction. At this time, the unlocking component 22 of the loading station opens the clamping component 21, and the material moving device 5, the clamping device 6 and the clamping claw 7 work together to send the piston to the clamping component 21. The unlocking component 22 is reset so that the clamping component 21 clamps the piston. Then the servo motor drives the annular workbench 8 to rotate and send the workpiece into the assembly station. The assembly mechanism 4 moves the hook to the top of the clamped piston through the clamping device 6 and the clamping claw 7, and assembles the piston and the hook. After the assembly is completed, the servo motor drives the annular workbench 8 to rotate and send the finished material into the unloading station. The unlocking component 22 is started to open the clamping component 21 to release the finished part. The material moving device 5, the clamping device 6 and the clamping claw 7 work together to send the finished part into the unloading channel to complete the assembly process.

[0035] The syringe piston hook assembly device realizes the connection between the piston and hook assembly operations through the cooperation of the annular workbench 8 and the clamping and transferring mechanism 2, greatly improving the assembly efficiency and reducing the workload of medical staff; the piston loading mechanism 3 can adjust the piston direction during the piston loading process, which is convenient for the next assembly operation. Under the joint action of the clamping component 21 and the unlocking component 22, the workpiece is quickly clamped, fixed and released, and it is ensured that the position of the workpiece does not shift during the transfer process, ensuring the smooth progress of the assembly work; the assembly mechanism 4 can complete the assembly of the piston and hook quickly and conveniently.

[0036] The piston feeding mechanism 3 includes a linear feeding device 31, a visual monitoring device 32, a bracket 33, an annular chute 34, an adjustment turntable 35 and an adjustment motor 36. The linear feeding device 31 is installed at the left end of the base frame 1, and the bracket 33 is fixedly connected to the base frame 1. The upper and lower ends of the bracket 33 are respectively fixedly installed with an annular chute 34 and an adjustment motor 36. The adjustment turntable 35 is arranged in the annular chute 34, and the output end of the adjustment motor 36 is fixedly connected to the adjustment turntable 35. The visual monitoring device 32 is fixedly mounted on the bracket of the material moving device 5 and aligned with the adjustment turntable 35. The discharge port of the linear feeding device 31 is aligned with the annular chute 34;

[0037] In the present invention, when the piston feeding mechanism 3 is working normally, the piston is moved to the top of the bracket 33 through the linear feeding device 31, and slides onto the adjustment turntable 35 in the annular slide groove 34. The visual monitoring device 32 monitors the direction of the piston and drives the adjustment turntable 35 to rotate through the adjustment motor 36 to adjust the piston to facilitate the next step of placing the piston on the mold of the clamping assembly 21, so that the hook can correspond to the piston's slot position at the assembly station to complete the assembly of the piston and the hook normally.

[0038] The clamping assembly 21 includes a fixed block 211, a movable block 212, a clamping spring 213, a sliding shaft 214, a clamping head 215, a piston limiting groove 216, a mold table 217, a piston positioning groove 218 and a piston positioning block 219. The two fixed blocks 211 are fixedly connected to the annular workbench 8, the movable block 212 is limited and slidably connected to the fixed block 211, one end of the sliding shaft 214 is fixedly connected to the movable block 212, and the other end of the sliding shaft 214 is limited and slidably connected to the fixed block 211. The fixed block 211 is fixedly connected to the movable block 212, and the other end of the sliding shaft 214 is limited and slidably connected to the fixed block 211. A clamping spring 213 is fixedly installed between the blocks 212, and a clamping head 215 is fixedly installed at the near end of the two movable blocks 212. The clamping head 215 is provided with a piston limiting groove 216. A mold table 217 is provided between the two fixed blocks 211 and is fixedly connected to the annular workbench 8. A piston positioning groove 218 is provided on the mold table 217. A piston positioning block 219 is fixedly installed in the piston positioning groove 218. The piston limiting groove 216, the piston positioning groove 218 and the piston positioning block 219 are used in conjunction with the piston;

[0039] The unlocking assembly 22 includes an unlocking cylinder 221, an unlocking claw 222, a fixed rod 223 and a rotating sleeve 224. The unlocking cylinder 221 is fixedly connected to the annular workbench 8, and the output end of the unlocking cylinder 221 is fixedly connected to the unlocking claw 222. The upper end of the movable block 212 is fixedly mounted with the fixed rod 223, and the rotating sleeve 224 is rotatably connected to the fixed rod 223.

[0040] In the present invention, when the clamping and moving mechanism 2 is working normally, at the loading station, the unlocking cylinder 221 is started to drive the unlocking claw 222 to move. After the unlocking claw 222 contacts the rotating sleeve 224, the movable block 212 is pushed away through the fixed rod 223, and the rotating sleeve 224 rotates around the fixed rod 223 during the pushing process, reducing the wear and friction resistance of the unlocking claw 222. The sliding shaft 214 and the fixed block 211 limit the moving direction of the movable block 212, and the movable block 212 drives the clamping head 215 to move, and the clamping spring 213 is compressed. Then the material moving device 5, the clamping device 6 and the clamping claw 7 work together to move the piston from The adjustment turntable 35 is transferred to the mold table 217, and the piston falls into the piston positioning groove 218 and is plugged into the piston positioning block 219; the unlocking cylinder 221 is started to drive the unlocking claw 222 to reset, and the clamping spring 213 resets to drive the movable block 212 and the clamping head 215 to move, and the piston is clamped by the clamping head 215 and the piston limiting groove 216 to fix the piston position; through the cooperation of the clamping assembly 21 and the unlocking assembly 22, the piston can be conveniently clamped and fixed, and during the transfer process, the piston is tightly fixed and will not shift, so that the assembly operation of the piston and the hook can be carried out smoothly.

[0041] The assembly mechanism 4 includes an assembly component 41, a hook limiting groove 42, a double-sided conveying device 43, a hook mold 44, a hook positioning groove 45, a clamping device 6 and a clamping claw 7. The double-sided conveying device 43 is fixedly mounted on the front end of the base frame 1. A plurality of hook molds 44 are symmetrically fixedly mounted on the two conveyor belts on the double-sided conveying device 43. The hook molds 44 are provided with hook positioning grooves 45 for use with the hooks.

[0042] The assembly component 41 includes a first fixed frame 411, a second fixed frame 412, a driving motor 413, a driving screw 414, a fixed slide 415, a slider 416, a lifting cylinder 417, an L-shaped connecting plate 418 and a limiting slide 419. The upper and lower ends of the first fixed frame 411 are fixedly connected to the second fixed frame 412 and the base frame 1 respectively; two fixed slides 415 are fixedly installed between the second fixed frame 412 and are rotatably connected to the driving screw 414 through bearings; the driving motor 413 is fixedly installed on the second fixed frame 412, and the driving motor 41 The output end of 3 is fixedly connected to the driving screw 414; the slider 416 is threadedly connected to the driving screw 414 through a threaded sleeve, and is limitedly slidably connected to the fixed slide 415. The slider 416 is fixedly connected to the lifting cylinder 417 through a connecting plate. The output end of the lifting cylinder 417 is fixedly connected to the clamping device 6 through an L-shaped connecting plate 418. The limiting slides 419 are symmetrically fixedly installed on both sides of the lifting cylinder 417. The limiting slides 419 are limitedly slidably connected to the L-shaped connecting plate 418; the clamping claw 7 of the assembly mechanism 4 is provided with a hook limiting groove 42 for use with the hook;

[0043] In the present invention, when the assembly mechanism 4 is working normally, at the assembly station, the hook is installed by the staff in the hook positioning groove 45 of the hook mold 44, and is moved toward the assembly station through the bilateral conveying device 43. When the workpiece moves to the bottom of the clamping device 6 and the clamping claw 7 of the assembly mechanism 4, the lifting cylinder 417 drives the clamping device 6 and the clamping claw 7 to move vertically downward through the L-shaped connecting plate 418 under the limiting action of the limiting slide bar 419 and clamps the hook. The hook is limited to the position by the hook limiting groove 42 and the protrusion in the hook limiting groove 42; the lifting cylinder 417 drives the clamping device 6 and the clamping claw 7 to reset through the L-shaped connecting plate 418 , the driving motor 413 drives the driving screw 414 to rotate, and the slider 416 is driven by the driving screw 414 to move horizontally under the limiting action of the fixed slide bar 415, moving the clamping device 6 and the clamping claw 7 to the assembly station, and completing the assembly of the piston and the hook with the cooperation of the lifting cylinder 417; through the cooperation of the bilateral conveying device 43, the hook mold 44 and the hook positioning groove 45, the feeding operation of the hook is greatly facilitated, and under the limiting action of the hook limiting groove 42 and the hook positioning groove 45, the orientation of the hook is guaranteed, so that the hook can correspond to the assembly position of the piston, and the assembly operation can be carried out smoothly.

[0044] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A syringe piston hook assembly device, comprising a base frame (1), a material transfer device (5), a clamping device (6), a clamping claw (7) and an annular workbench (8), characterized in that: The annular workbench (8) is provided with a clamping and material-moving mechanism (2), and the left and right ends of the base frame (1) are provided with a material-moving device (5), a clamping device (6) and a clamping claw (7), the left end of the base frame (1) is provided with a piston-feeding mechanism (3), the front end of the base frame (1) is provided with an assembly mechanism (4), and the clamping device (6) is fixedly connected to the clamping claw (7); The clamping and material-moving mechanism (2) comprises a clamping assembly (21) and an unlocking assembly (22), wherein a plurality of clamping assemblies (21) are fixedly connected to the annular workbench (8) in a circular array, and two unlocking assemblies (22) are fixedly connected to the base frame (1) in a left-right symmetrical manner. The piston feeding mechanism (3) includes a linear feeding device (31), a visual monitoring device (32), a bracket (33), an annular chute (34), an adjustment turntable (35) and an adjustment motor (36), wherein the linear feeding device (31) is mounted on the left end of the base frame (1), the bracket (33) is fixedly connected to the base frame (1), the upper and lower ends of the bracket (33) are respectively fixedly mounted with an annular chute (34) and an adjustment motor (36), the adjustment turntable (35) is arranged in the annular chute (34), the output end of the adjustment motor (36) is fixedly connected to the adjustment turntable (35), the visual monitoring device (32) is fixedly mounted on the bracket of the material moving device (5) and aligned with the adjustment turntable (35), and the discharge port of the linear feeding device (31) is aligned with the annular chute (34); The clamping assembly (21) includes a fixed block (211), a movable block (212), a clamping spring (213), a sliding shaft (214), a clamping head (215), a piston limiting groove (216), a mold table (217), a piston positioning groove (218) and a piston positioning block (219), wherein the two fixed blocks (211) are fixedly connected to the annular workbench (8), the movable block (212) is slidingly connected to the fixed block (211), one end of the sliding shaft (214) is fixedly connected to the movable block (212), and the other end of the sliding shaft (214) is fixedly connected to the fixed block (211). The blocks (211) are limited and slidably connected, a clamping spring (213) is fixedly installed between the fixed block (211) and the movable block (212), a clamping head (215) is fixedly installed at the near end of the two movable blocks (212), and the clamping head (215) is provided with a piston limiting groove (216), a mold table (217) is provided between the two fixed blocks (211) and is fixedly connected to the annular workbench (8), a piston positioning groove (218) is provided on the mold table (217), and a piston positioning block (219) is fixedly installed in the piston positioning groove (218).

2. The syringe piston hook assembly device according to claim 1, characterized in that: The piston limiting groove (216), the piston positioning groove (218) and the piston positioning block (219) are configured to cooperate with the piston.

3. The syringe piston hook assembly device according to claim 2, characterized in that: The unlocking assembly (22) comprises an unlocking cylinder (221), an unlocking claw (222), a fixed rod (223) and a rotating sleeve (224); the unlocking cylinder (221) is fixedly connected to the annular workbench (8); the output end of the unlocking cylinder (221) is fixedly connected to the unlocking claw (222); and the rotating sleeve (224) is rotationally connected to the fixed rod (223).

4. The syringe piston hook assembly device according to claim 3, characterized in that: A fixing rod (223) is fixedly mounted on the upper end of the movable block (212).

5. The syringe piston hook assembly device according to claim 1, characterized in that: The assembly mechanism (4) includes an assembly component (41), a hook limiting groove (42), a bilateral conveying device (43), a hook mold (44), a hook positioning groove (45), a clamping device (6) and a clamping claw (7). The bilateral conveying device (43) is fixedly mounted on the front end of the base frame (1). A plurality of hook molds (44) are symmetrically fixedly mounted on the two conveyor belts on the bilateral conveying device (43). The hook positioning groove (45) used in conjunction with the hook is opened on the hook mold (44).

6. The syringe piston hook assembly device according to claim 5, characterized in that: The assembly component (41) includes a first fixed frame (411), a second fixed frame (412), a driving motor (413), a driving screw (414), a fixed slide (415), a slider (416), a lifting cylinder (417), an L-shaped connecting plate (418) and a limiting slide (419). The upper and lower ends of the first fixed frame (411) are fixedly connected to the second fixed frame (412) and the base frame (1) respectively; two fixed slides (415) are fixedly installed between the second fixed frame (412) and are rotatably connected to the driving screw (414) through bearings; the driving motor (413) is fixedly installed on the second fixed frame (412), and the driving motor (413) is fixedly installed on the second fixed frame (412). ) is fixedly connected to the driving screw (414); the slider (416) is threadedly connected to the driving screw (414) through a threaded sleeve and is limitedly slidably connected to the fixed slide (415); the slider (416) is fixedly connected to the lifting cylinder (417) through a connecting plate; the output end of the lifting cylinder (417) is fixedly connected to the clamping device (6) of the assembly mechanism (4) through an L-shaped connecting plate (418); limiting slides (419) are symmetrically fixedly installed on both sides of the lifting cylinder (417); the limiting slides (419) are limitedly slidably connected to the L-shaped connecting plate (418); a hook limiting groove (42) used in conjunction with the hook is provided on the clamping jaw (7) of the assembly mechanism (4).

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