Load aging test auxiliary tool
By designing auxiliary fixtures for load aging testing, and using sliding frames and counterweight modules to simulate the actual use scenario of an electronic booster device for a syringe, the problem that existing testing methods cannot accurately simulate this was solved, achieving more efficient life testing and wider applicability.
Patent Information
- Application Number
- CN202422741331.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-11
- Publication Date
- 2025-11-18
- Estimated Expiration
- 2034-11-11
AI Technical Summary
Existing life testing methods for electronic booster devices for syringes cannot effectively simulate real-world usage scenarios, resulting in significant deviations in test results.
Design an auxiliary fixture for load aging test, including a workbench, a vertical positioning seat, a clamping mechanism and a sliding frame. The electronic booster device of the syringe is fixed by the vertical positioning seat. The pressure rod of the sliding frame simulates the reaction force of the piston rod on the push head by its own gravity. The downward pressure is adjusted with the counterweight module to simulate the actual use scenario.
It improves the accuracy and applicability of life testing for electronic booster devices in syringes, adapts to different models and operating conditions, and reduces testing costs and complexity.
Smart Images
Figure CN223565221U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to test frock technical field, specifically, it is related to a load aging test auxiliary frock. BACKGROUND
[0002] The injector electronic boosting device is an advanced medical auxiliary equipment, which plays an important role in the modern medical field. The injector electronic boosting device drives the push head to do reciprocating motion through the cooperation of the motor and the lead screw, and moves the piston rod of the injector to realize the precise injection operation of the injector when the push head advances.
[0003] In the production process of the injector electronic boosting device, the service life of the injector electronic boosting device needs to be tested to ensure that there is no problem such as medical accident or inaccurate injection dose caused by premature damage of key components (such as motor, push head, etc.) in actual use. The existing test method for the injector electronic boosting device is mainly to test whether the reciprocating movement times of the push head driven by the motor and the lead screw reach the set standard. If the reciprocating movement times reach the set standard, it is determined that the injector electronic boosting device meets the requirements. However, the deficiency of this test method is that during the reciprocating movement of the push head driven by the motor and the lead screw, the push head is in an unloaded state (i.e. no resistance is applied to the push head, and the resistance is the reaction force when the push head pushes the piston rod of the injector), which makes it difficult to simulate the actual use scene of the injector electronic boosting device during the test process, resulting in a large deviation in the test result. SUMMARY
[0004] In order to solve the above problems, the main purpose of the utility model is to provide a load aging test auxiliary frock which can assist the injector electronic boosting device in service life detection and improve the detection accuracy.
[0005] In order to achieve the main purpose of the utility model, the utility model provides a load aging test auxiliary frock, which comprises a workbench, a vertical positioning seat, a pressing mechanism and a sliding frame. The workbench comprises a table top and a support, the support is supported at the bottom of the table top, the vertical positioning seat is installed on the table top, the vertical positioning seat has a positioning groove, the pressing mechanism is installed on the vertical positioning seat or the table top, the pressing end of the pressing mechanism can move towards the inlet of the positioning groove, a clamping position is formed between the pressing end and the positioning groove, the sliding frame comprises a pressing rod, a load plate and a connecting rod assembly. In the height direction of the workbench, the pressing rod is above the table top, the load plate is below the table top, the connecting rod assembly is connected between the pressing rod and the load plate, the connecting rod assembly and / or the load plate are in sliding connection with the workbench in the height direction, and the sliding frame can generate a downward pressure on the pressing rod under the action of gravity.
[0006] As can be seen from the above, the vertical positioning seat cooperates with the pressing mechanism to position and fix the electronic boosting device of the syringe to be tested; the pressing rod of the sliding frame is used to overlap the push head of the electronic boosting device of the syringe, and the sliding frame can exert a downward pressure on the push head through its own gravity to simulate the reaction force exerted by the piston rod of the syringe on the push head when the motor of the electronic boosting device of the syringe drives the push head to move upward, thereby making the test working condition of the electronic boosting device of the syringe more consistent with the actual use scene, and improving the accuracy of the service life detection of the electronic boosting device of the syringe.
[0007] One preferred scheme is that the load aging test auxiliary tool also includes a counterweight module, and the counterweight module includes at least one counterweight block, which can be stacked on the load plate.
[0008] As can be seen from the above, the setting of the counterweight module makes the downward pressure exerted by the pressing rod of the sliding frame on the push head of the electronic boosting device of the syringe adjustable, and makes the load aging test auxiliary tool adaptable to electronic boosting devices of syringes of different models and different use conditions, thereby improving the practicability of the load aging test auxiliary tool and expanding the application range of the load aging test auxiliary tool.
[0009] A further scheme is that the number of counterweight blocks is two or more, and the weights of the two or more counterweight blocks are the same or different.
[0010] As can be seen from the above, this design is beneficial to more diversified adjustment of the downward pressure exerted by the pressing rod of the sliding frame on the push head of the electronic boosting device of the syringe, and has stronger practicability and wider application range.
[0011] Another preferred scheme is that the vertical positioning seat includes a seat body, a first positioning module and a base, the seat body includes a bottom plate and a vertical plate, the bottom plate is installed on the table top, the vertical plate is installed on the bottom plate, the first positioning module includes two first positioning blocks, the first positioning blocks are installed on the vertical plate, one side of each first positioning block facing the other first positioning block is provided with a first matching positioning surface, a part of the positioning groove is formed between the first matching positioning surfaces of the two first positioning blocks, the base is installed on the bottom plate, the base and the first positioning module are distributed along the height direction, and the top surface of the base is provided with a supporting positioning surface which is part of the positioning groove.
[0012] As can be seen from the above, this design is beneficial to simplifying the structure of the vertical positioning seat and reducing the weight and manufacturing cost of the vertical positioning seat.
[0013] A further scheme is that the vertical positioning seat also includes a second positioning module, the second positioning module includes two second positioning blocks, the second positioning blocks are installed on the vertical plate, one side of each second positioning block facing the other second positioning block is provided with a second matching positioning surface, a part of the positioning groove is formed between the second matching positioning surfaces of the two second positioning blocks, and the second positioning module is located between the first positioning module and the base.
[0014] From the above, the second positioning module can improve the positioning accuracy and support strength of the vertical positioning seat for the electronic booster device of the syringe, so that the pressure rod of the sliding frame can better exert downward pressure on the push head of the electronic booster device of the syringe.
[0015] Further, the first positioning block, the second positioning block and the vertical plate are detachably connected, and the base and the bottom plate are detachably connected.
[0016] From the above, the vertical positioning seat can be adapted to different models of electronic booster devices of syringes by replacing the first positioning block, the second positioning block and the base, thereby improving the application range of the load aging test auxiliary tool and reducing the adaptation cost.
[0017] Further, the bottom plate is provided with a slot, the bottom of the base is provided with an insertion part, and the insertion part is detachably inserted into the slot; the first positioning block, the second positioning block and the base are formed by 3D printing, or the first positioning block, the second positioning block and the base are formed by injection molding process.
[0018] From the above, the design can simplify the assembly connection structure of the bottom plate and the base, and the 3D printing of the first positioning block, the second positioning block and the base can reduce the manufacturing cost, and the first positioning block, the second positioning block and the base formed by 3D printing or injection molding process can also reduce the weight of the vertical positioning seat.
[0019] Further, the base is provided with a first avoiding slot, the first avoiding slot penetrates the base in the height direction; the bottom plate is provided with a second avoiding slot, the second avoiding slot penetrates the bottom plate in the height direction; the table top is provided with a third avoiding slot, the third avoiding slot penetrates the table top in the height direction, and the second avoiding slot communicates the first avoiding slot and the third avoiding slot.
[0020] From the above, the design can avoid the power cable of the electronic booster device of the syringe, and prevent the power cable from being damaged by pressure.
[0021] Another preferred scheme is that the side of the pressure rod facing the vertical positioning seat is provided with a fourth avoiding slot, and the fourth avoiding slot penetrates the pressure rod in the height direction.
[0022] From the above, the design of the third avoiding slot on the pressure rod enables the pressure rod to avoid the structure of the part of the electronic booster device of the syringe, so as to ensure that the pressure rod can closely follow the movement of the push head of the electronic booster device of the syringe and exert stable and reliable downward pressure on the push head.
[0023] Further, the pressing mechanism comprises a fixing frame, a pressing rod, a control rod, a connecting rod and a pressing piece, the fixing frame is installed on the vertical positioning seat or the table top, the fixed end of the pressing rod is rotationally connected with the fixing frame, the connecting part of the control rod is rotationally connected with the fixed end of the pressing rod, the connecting rod is rotationally connected with the connecting part of the control rod and the fixing frame respectively, the fixing frame, the pressing rod, the control rod and the connecting rod form a double rocker mechanism, the extending end of the pressing rod extends to the front of the placing opening, the pressing piece is installed on the extending end of the pressing rod, the pressing piece extends towards the placing opening, and the position of the pressing piece on the extending end of the pressing rod is adjustable; or the pressing mechanism is a pneumatic cylinder or an electric cylinder, and the push rod of the pneumatic cylinder or the electric cylinder extends towards the placing opening.
[0024] As can be seen from the above, the design can ensure that the pressing mechanism cooperates with the vertical fixing seat to reliably position and clampingly fix the electronic booster device of the syringe. BRIEF DESCRIPTION OF DRAWINGS
[0025] Figure 1 is the use state reference drawing of the load aging test auxiliary tool embodiment of the utility model.
[0026] Figure 2 is the structure drawing of the load aging test auxiliary tool embodiment of the utility model.
[0027] Figure 3 is the structure drawing of the load aging test auxiliary tool embodiment of the utility model after omitting part of components.
[0028] Figure 4 is the structure drawing of the vertical positioning seat of the load aging test auxiliary tool embodiment of the utility model.
[0029] Figure 5 is the exploded view of the vertical positioning seat of the load aging test auxiliary tool embodiment of the utility model.
[0030] Figure 6 is the structure drawing of the pressing mechanism of the load aging test auxiliary tool embodiment of the utility model.
[0031] The utility model will be further described below in combination with the drawings and embodiments. DETAILED DESCRIPTION
[0032] Referring to Figure 1 and Figure 2 , the load aging test auxiliary tool 100 is used for testing the service life of the electronic booster device 10 of the syringe, so as to improve the accuracy of the service life test of the electronic booster device 10 of the syringe. The load aging test auxiliary tool 100 comprises a workbench 1, a vertical positioning seat 2, a pressing mechanism 3, a sliding frame 4 and a counterweight module 5.
[0033] In combination with Figure 3The workbench 1 comprises a table top 11 and a support 12 which is supported and fixed at the bottom of the table top 11. Preferably, in the embodiment, the table top 11 is substantially flat, and the support 12 comprises a support column group and a seat plate, the support column group extends along the height direction of the workbench 1 and is connected between the table top 11 and the seat plate, and the seat plate is used to contact the ground to enable the workbench 1 to be stably placed on the ground. Through the design of the support 12, the structure of the workbench 1 can be simplified, the manufacturing of the workbench 1 is simpler, and the manufacturing cost of the workbench 1 is reduced.
[0034] In combination Figure 4 And Figure 5 The vertical positioning seat 2 is installed on the table top 11, and the vertical positioning seat 2 has a positioning groove which is used to position the electronic booster device 10 of the syringe to be tested and fix the electronic booster device 10 of the syringe in cooperation with the pressing mechanism 3.
[0035] Preferably, the vertical positioning seat 2 comprises a seat body 21, a first positioning module 22, a second positioning module 23 and a base 24. The seat body 21 comprises a bottom plate 211 and a vertical plate 212, the bottom plate 211 is detachably installed on the table top 11, so that the vertical positioning seat 2 as a whole can be disassembled and replaced relative to the table top 11; the vertical plate 212 is installed on the bottom plate 211, and preferably, a reinforcing rib is connected between the vertical plate 212 and the bottom plate 211 to enhance the overall strength of the seat body 21 and avoid bending deformation during the testing of the electronic booster device 10 of the syringe.
[0036] The first positioning module 22 comprises two first positioning blocks 221, the first positioning blocks 221 are installed on the vertical plate 212, and preferably, the first positioning blocks 221 are located at the top of the vertical plate 212; wherein one side of each first positioning block 221 facing the other first positioning block 221 is provided with a first matching positioning surface 2211, and the first matching positioning surfaces 2211 of the two first positioning blocks 221 form part of the positioning groove.
[0037] The second positioning module 23 comprises two second positioning blocks 231, the second positioning blocks 231 are installed on the vertical plate 212, and the second positioning blocks 231 are located between the first positioning blocks 221 and the bottom plate 211; wherein one side of each second positioning block 231 facing the other second positioning block 231 is provided with a second matching positioning surface 2311, and the second matching positioning surfaces 2311 of the two second positioning blocks 231 form part of the positioning groove. The second positioning module 23 is additionally provided to improve the positioning accuracy and support strength of the vertical positioning seat 2 for the electronic booster device 10 of the syringe, so that the pressing rod 41 of the sliding frame 4 can better exert downward pressure on the push head 101 of the electronic booster device 10 of the syringe.
[0038] The base 24 is mounted on the bottom plate 211, so that the base 24, the second positioning module 23 and the first positioning module 22 are sequentially distributed in the height direction of the workbench 1. The top surface of the base 24 is provided with a supporting and positioning surface 241, so that the supporting and positioning surface 241 is part of the positioning groove. Through the above structural design of the vertical positioning seat 2, the structure of the vertical positioning seat 2 is simplified, and the weight and manufacturing cost of the vertical positioning seat 2 are reduced.
[0039] In addition, the first positioning block 221 is detachably connected with the vertical plate 212. Preferably, the first positioning block 221 and the vertical plate 212 are detachably connected through bolts. The second positioning block 231 is detachably connected with the vertical plate 212. Preferably, the second positioning block 231 and the vertical plate 212 are detachably connected through bolts. The base 24 is detachably connected with the bottom plate 211. Preferably, the bottom plate 211 is provided with a slot 2111, and the bottom of the base 24 is provided with an insertion part 242 which is detachably inserted into the slot 2111. This design can simplify the assembly and connection structure of the bottom plate 211 and the base 24. Through the above detachable connection design of the first positioning block 221, the second positioning block 231 and the base 24 with the seat body 21, the vertical positioning seat 2 can be adapted to different models of the electronic booster device 10 for the syringe by replacing the first positioning block 221, the second positioning block 231 and the base 24, thereby improving the application range of the load aging test auxiliary tool 100 and reducing the adaptation cost.
[0040] Further, the first positioning block 221, the second positioning block 231 and the base 24 can be formed by 3D printing. Since 3D printing can reduce the manufacturing cost of the first positioning block 221, the second positioning block 231 and the base 24, and can reduce the weight of the vertical positioning seat, of course, as another optional solution, the first positioning block 221, the second positioning block 231 and the base 24 can also be formed by injection molding process.
[0041] In order to avoid the power cable of the measured electronic booster device 10 for the syringe and prevent the power cable from being damaged under pressure, a first avoiding groove 243 can be arranged on the base 24, a second avoiding groove 2112 can be arranged on the bottom plate 211, and a third avoiding groove 111 can be arranged on the table top 11. The first avoiding groove 243 penetrates the base 24 in the height direction; the second avoiding groove 2112 penetrates the bottom plate 211 in the height direction, and at this time the second avoiding groove 2112 can be considered as being integrated with the slot 2111; the third avoiding groove 111 penetrates the table top 11 in the height direction, and the second avoiding groove 2112 communicates the first avoiding groove 243 and the third avoiding groove 111.
[0042] In combination Figure 6In the embodiment, the pressing mechanism 3 is installed on the vertical positioning seat 2; however, as an alternative, the pressing mechanism 3 can also be installed on the table top 11. The pressing end of the pressing mechanism 3 can be moved towards the placement entrance of the positioning slot, so that the pressing end can form a clamping position with the positioning slot of the vertical positioning seat 2, which is used to accommodate and position the measured electronic booster device 10 of the syringe.
[0043] Preferably, in the embodiment, the pressing mechanism 3 includes a fixed frame 31, a pressing rod 32, a control rod 33, a connecting rod 34, and a pressing piece 35 (i.e. the aforementioned pressing end), the fixed frame 31 is installed on the vertical positioning seat 2, the fixed end of the pressing rod 32 is rotationally connected with the fixed frame 31, the connecting part of the control rod 33 is rotationally connected with the fixed end of the pressing rod 32, the connecting rod 34 is respectively rotationally connected with the connecting part of the control rod 33 and the fixed frame 31, the fixed frame 31, the pressing rod 32, the control rod 33 and the connecting rod 34 form a double rocker mechanism, and the extending end of the pressing rod 32 extends to the front of the placement entrance. The pressing piece 35 includes a pressing column 351 and a rubber sleeve 352, the pressing column 351 is installed on the extending end of the pressing rod 32, and the pressing column 351 can slide along the extending end of the pressing rod 32 to adjust its position, so as to ensure that the pressing piece 35 can reliably press the measured electronic booster device 10 of the syringe on the vertical positioning seat 2; the rubber sleeve 352 is sleeved on the end of the pressing column 351 close to the vertical positioning seat 2, so as to contact with the electronic booster device 10 of the syringe, thereby avoiding damaging the electronic booster device 10 of the syringe when the pressing piece 35 is pressed and fixed, and improving the reliability of pressing and fixing the electronic booster device 10 of the syringe. By designing the pressing mechanism 3 as the above-mentioned purely mechanical structure, the operation and use of the pressing mechanism 3 are more convenient, and it is not necessary to be connected with external power source and gas source, thereby improving the convenience of using the load aging test auxiliary tool 100, and reducing the use restrictions of the load aging test auxiliary tool 100 in the use environment. Of course, as an alternative, in other embodiments, the pressing mechanism 3 can also use an automatic driving mechanism such as a pneumatic cylinder or an electric cylinder, wherein the push rod of the pneumatic cylinder or the electric cylinder extends towards the placement entrance.
[0044] As Figure 3As shown, the sliding frame 4 comprises a pressing rod 41, a load plate 42 and a linkage assembly 43. In the height direction of the workbench 1, the pressing rod 41 is above the tabletop 11, the load plate 42 is below the tabletop 11, and the linkage assembly 43 is connected between the pressing rod 41 and the load plate 42; wherein the linkage assembly 43 and / or the load plate 42 are in sliding connection with the workbench 1 in the height direction of the workbench 1, so that the sliding frame 4 can generate a downward pressure on the pressing rod 41 under the action of gravity to test the push head 101 of the electronic booster device 10 of the syringe under test, thereby simulating the resistance suffered by the electronic booster device 10 of the syringe in actual use. In this embodiment, the linkage assembly 43 is in sliding connection with the tabletop 11 of the workbench 1; preferably, a linear bearing is arranged between the linkage assembly 43 and the tabletop 11 to reduce the resistance when the sliding frame 4 slides relative to the tabletop 11, thereby ensuring that the pressing rod 41 can exert a stable downward pressure on the push head 101 of the electronic booster device 10 of the syringe.
[0045] Preferably, the side of the pressing rod 41 facing the vertical positioning seat 2 is provided with a fourth avoiding groove 411 which penetrates the pressing rod 41 in the height direction. The design of the third avoiding groove 111 on the pressing rod 41 allows the pressing rod 41 to avoid the structure of the parts on the electronic booster device 10 of the syringe, so as to ensure that the pressing rod 41 can closely follow the movement of the push head 101 of the electronic booster device 10 of the syringe and exert a stable and reliable downward pressure on the push head 101.
[0046] As shown, Figure 1 The counterweight module 5 comprises at least one counterweight 51 which can be stacked on the load plate 42; the arrangement of the counterweight module 5 allows the downward pressure exerted by the pressing rod 41 of the sliding frame 4 on the push head 101 of the electronic booster device 10 of the syringe to be adjustable, and allows the load aging test auxiliary tool 100 to be adapted to different models and different use conditions of the electronic booster device 10 of the syringe, thereby improving the practicability of the load aging test auxiliary tool 100 and expanding the applicable range of the load aging test auxiliary tool 100. Preferably, the number of counterweights 51 is two or more, and the weights of the two or more counterweights 51 are the same or different; this design is beneficial to more diversified adjustment of the downward pressure exerted by the pressing rod 41 of the sliding frame 4 on the push head 101 of the electronic booster device 10 of the syringe, and has stronger practicability and wider applicability.
[0047] In summary, the vertical positioning seat 2 cooperates with the pressing mechanism 3 to position and fix the measured injector electronic boosting device 10; the pressing rod 41 of the sliding frame 4 is used to overlap and be placed above the push head 101 of the injector electronic boosting device 10, and the sliding frame 4 can exert a set downward pressure on the push head 101 through the cooperation of its own gravity and the counterweight assembly, so as to simulate the reaction force exerted by the piston rod of the injector on the push head 101 when the motor cooperates with the lead screw to drive the push head 101 to move upwards, and then make the test working condition of the injector electronic boosting device 10 more consistent with the actual use scene, thereby improving the accuracy of the service life detection of the injector electronic boosting device 10.
[0048] Finally, it needs to be emphasized that the above is only the preferred embodiment of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A load aging test assist tool, characterized by, The load aging test auxiliary tool comprises a workbench, a vertical positioning seat, a pressing mechanism and a sliding frame. The workbench comprises a table top and a support, and the support is supported at the bottom of the table top. The vertical positioning seat is installed on the table top, and has a positioning groove. The pressing mechanism is installed on the vertical positioning seat or the table top, and a pressing end of the pressing mechanism is movable towards an entrance of the positioning groove, and a clamping position is formed between the pressing end and the positioning groove. The sliding frame comprises a pressing rod, a load plate and a linkage assembly, and in the height direction of the workbench, the pressing rod is above the table top, the load plate is below the table top, and the linkage assembly is connected between the pressing rod and the load plate. The linkage assembly and / or the load plate are in sliding connection with the workbench in the height direction, and the sliding frame can generate a downward pressing force on the pressing rod under the action of gravity.
2. The load aging test auxiliary tool according to claim 1, wherein the load aging test auxiliary tool further comprises a counterweight module, and the counterweight module comprises at least one counterweight block, and the counterweight block is stackable on the load plate.
3. The load aging test auxiliary tool according to claim 2, wherein the number of the counterweight blocks is two or more, and the weights of the two or more counterweight blocks are the same or different.
4. The load aging test auxiliary tool according to claim 1, wherein the vertical positioning seat comprises a seat body and a first positioning module, the seat body comprises a bottom plate and a vertical plate, the bottom plate is installed on the table top, and the vertical plate is installed on the bottom plate, the first positioning module comprises two first positioning blocks, the first positioning blocks are installed on the vertical plate, one side of each first positioning block is provided with a first matching positioning surface, and the first matching positioning surfaces of the two first positioning blocks form part of the positioning groove.
5. The load aging test auxiliary tool according to claim 4, wherein the vertical positioning seat further comprises a second positioning module, the second positioning module comprises two second positioning blocks, the second positioning blocks are installed on the vertical plate, one side of each second positioning block is provided with a second matching positioning surface, the second matching positioning surfaces of the two second positioning blocks form part of the positioning groove, and the second positioning module is located between the first positioning module and the bottom plate.
6. The load aging test auxiliary tool according to claim 5, wherein the first positioning blocks, the second positioning blocks and the vertical plate are detachably connected, and the bottom plate and the bottom plate are detachably connected.
7. The load aging test auxiliary tool according to claim 6, wherein The bottom plate is provided with a slot, and the bottom of the base is provided with an insertion part which is detachably inserted into the slot. The first positioning block, the second positioning block and the base are formed by 3D printing, or The first positioning block, the second positioning block and the base are formed by an injection molding process.
8. The load aging test auxiliary tool according to claim 5, wherein: The base is provided with a first avoiding slot which penetrates the base in the height direction; The bottom plate is provided with a second avoiding slot which penetrates the bottom plate in the height direction; The table top is provided with a third avoiding slot which penetrates the table top in the height direction, and the second avoiding slot is in communication with the first avoiding slot and the third avoiding slot.
9. The load aging test auxiliary tool according to claim 1, wherein: The pressing rod is provided with a fourth avoiding slot on the side facing the vertical positioning seat, and the fourth avoiding slot penetrates the pressing rod in the height direction.
10. The load aging test auxiliary tool according to any one of claims 1 to 9, wherein: The pressing mechanism comprises a fixing frame, a lower pressing rod, a control rod, a connecting rod and a pressing part, the fixing frame is installed on the vertical positioning seat or the table top, the fixed end of the lower pressing rod is rotationally connected with the fixing frame, the connecting part of the control rod is rotationally connected with the fixed end of the lower pressing rod, the connecting rod is respectively rotationally connected with the connecting part of the control rod and the fixing frame, the fixing frame, the lower pressing rod, the control rod and the connecting rod form a double rocker mechanism, the extending end of the lower pressing rod extends to the front of the placing opening, the pressing part is installed on the extending end of the lower pressing rod, the pressing part extends towards the placing opening, and the position of the pressing part on the extending end of the lower pressing rod is adjustable; or The pressing mechanism is a pneumatic cylinder or an electric cylinder, and the push rod of the pneumatic cylinder or the electric cylinder extends towards the placing opening.