Jig for testing thrust of injector

Abstract

The embodiment of the utility model relates to the technical field of injector testing, in particular to an injector thrust testing jig which comprises a support, a transmission assembly and a resistance simulation piece, the transmission assembly is movably installed on the support, and the resistance simulation piece is connected to the power output end of the transmission assembly. The power input end of the transmission assembly is used for being connected with a moving part of the injector, and under driving of the moving part, the transmission assembly can overcome resistance provided by the resistance simulation piece to move relative to the support. When the injector thrust test jig provided by the embodiment of the utility model is used for carrying out thrust test on the injector, liquid medicine does not need to be filled into the injector, and resistance formed by the liquid medicine to the injector during injection is simulated by using resistance applied to the injector by the resistance simulation piece, so that the liquid medicine is saved while the test requirement is met, and the test efficiency is improved. And the test cost is reduced.

Description

Technical Field

[0001] The present application belongs to the technical field of syringe testing, and more specifically, to a syringe thrust testing fixture. Background Art

[0002] At present, pre-filled, pre-sealed and other types of syringes that are directly installed with drug containers need to be tested for thrust during the research and development stage and the later test and inspection stage to determine whether they meet the design or production requirements. The method used in the prior art is to fill the syringe with a complete liquid medicine, test the injection force during the injection process, and the test is qualified when the thrust value required for injecting the liquid medicine is less than or equal to the given test value of the product, and when the thrust required for injecting the liquid medicine is greater than the given test value of the product thrust, the syringe product does not meet the test requirements, that is, the syringe design fails. The disadvantage of the existing syringe thrust test fixture is that: although the syringe fixture can test the product, since the syringe thrust test fixture can only provide the function of fixing the syringe, during the test process, the syringe needs to be tested with the liquid medicine, and each test requires a lot of experiments. Due to the non-reusability of the liquid medicine, the cost of the test will increase, resulting in a waste of resources, and indirectly increasing the purchase and use costs for patients.

[0003] Therefore, there is an urgent need for a fixture that can reduce the cost of performing thrust testing on a syringe. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a syringe thrust test fixture to solve the technical problem of excessively high costs required for testing syringes in the prior art.

[0005] To achieve the above-mentioned purpose, the technical solution adopted in the present application is: to provide a syringe thrust test fixture, including a bracket, a transmission assembly and a resistance simulation component, the transmission assembly is movably mounted on the bracket, the resistance simulation component is connected to the power output end of the transmission assembly, and the power input end of the transmission assembly is used to connect to the moving part of the syringe. Under the drive of the moving part, the transmission assembly can overcome the resistance provided by the resistance simulation component and move relative to the bracket.

[0006] The beneficial effect of the syringe thrust test fixture provided by the present application is that: in the process of testing the syringe using the syringe thrust test fixture of the present application, the test rod of the thrust tester is used to apply thrust to the syringe without liquid medicine to push the moving part of the syringe to move. Under the connection between the power input end and the moving part, the moving part applies driving force to the power input end of the transmission component, and under the connection between the power output end and the resistance simulation part, the transmission component transmits the driving force of the moving part to the resistance simulation part, and the resistance simulation part also applies resistance to the transmission component. Under the drive of the moving part, the transmission component can overcome the resistance provided by the resistance simulation part and move relative to the bracket. In this way, the syringe completes the action of simulating injection. During this process, the syringe is subjected to the resistance formed by the syringe thrust test fixture, which is the resistance formed by the liquid medicine on the syringe when the liquid medicine is contained, thereby simulating the situation when the syringe injects the liquid medicine without the liquid medicine. The thrust data measured at this time is the thrust data when the syringe injects the liquid medicine, thereby realizing the test of the syringe thrust. In addition, this test method does not need to load the liquid medicine into the syringe, which saves the liquid medicine and reduces the cost.

[0007] Optionally, the transmission assembly includes a rigid transmission member and a flexible transmission member that are interconnected, the rigid transmission member has the power input end, and the flexible transmission member has the power output end; the rigid transmission member is movably connected to the bracket. When the moving part moves, a driving force is applied to the rigid transmission member, and the rigid transmission member and the flexible transmission member can overcome the resistance provided by the resistance simulation member to move; the transmission assembly adopts a combination of rigid transmission members and flexible transmission members to utilize the characteristics of the flexible transmission member that the shape is easy to change, so as to facilitate the flexible setting of the positions of the rigid transmission member, the resistance simulation member and other components.

[0008] Optionally, the transmission assembly further comprises a transmission roller, the transmission roller is rotatably connected to the bracket, and the flexible transmission member is wound around the transmission roller. The transmission roller provides strong support for the flexible transmission member, and the transmission roller rotates with the movement of the flexible transmission member to reduce the friction resistance formed therebetween, thereby reducing the wear on the flexible transmission member and extending the service life of the flexible transmission member.

[0009] Optionally, the rigid transmission member is arranged vertically, the transmission roller is arranged horizontally, and the height of the transmission roller is located between the end where the rigid transmission member is connected to the flexible transmission member and the power input end. This position design makes the interaction points between the moving part and the rigid transmission member, the interaction points between the rigid transmission member and the flexible transmission member, and the interaction points between the flexible transmission member and the transmission roller staggered in the height direction, so that the various force points of the transmission assembly are dispersed, thereby improving the stability of the operation of the transmission assembly.

[0010] Optionally, a limiting groove is provided on the side wall of the rigid transmission member, and the limiting groove has a first side wall and a second side wall opposite to each other along the moving direction of the rigid transmission member, and the transmission roller is located between the first side wall and the second side wall, so as to abut against the first side wall and the second side wall respectively to limit the travel of the rigid transmission member. The transmission roller not only has the function of supporting the flexible transmission member, but also has the function of limiting the rigid transmission member, which simplifies the structural design, reduces the cost, and makes the syringe thrust test fixture more compact, small in size, and easy to carry.

[0011] Optionally, the bracket includes a main frame and a guide frame arranged in the main frame, the guide frame includes a vertically connected guide seat and a guide cylinder, the guide seat is installed in the main frame, the extension direction of the guide cylinder is consistent with the movement direction of the rigid transmission member, and the rigid transmission member is movably plugged into the guide cylinder. When the rigid transmission member moves relative to the bracket, the guide cylinder will effectively guide the rigid transmission member, so that the rigid transmission member will accurately move along the set path, thereby improving the movement stability and accuracy of the transmission assembly.

[0012] Optionally, the guide seat is located between the transmission roller and the resistance simulation member, and a guide groove is provided on the guide seat. The extension direction of the guide groove is consistent with the movement direction of the flexible transmission member located between the transmission roller and the resistance simulation member, and the flexible transmission member located between the transmission roller and the resistance simulation member is movably accommodated in the guide groove. The guide groove has a guiding effect on the flexible transmission member located between the transmission roller and the resistance simulation member, so that the flexible transmission member can accurately move along the set path, thereby improving the stability and accuracy of the movement of the transmission assembly. In addition, the guide seat not only has a supporting effect on the guide cylinder, but also has a guiding effect on the flexible transmission member, which simplifies the structural design and makes the overall structure of the syringe thrust test fixture more compact.

[0013] Optionally, the main frame includes a top frame, a bottom frame, a first frame and a second frame, the top frame and the bottom frame are spaced apart along the moving direction of the rigid transmission member, the first frame and the second frame are spaced apart along a direction perpendicular to the moving direction, the two ends of the transmission roller are rotatably connected to the first frame and the second frame respectively, and the two ends of the guide seat are fixedly connected to the first frame and the second frame respectively. A bracket of this structure can provide stable support for the transmission assembly and can provide the required movement space for the rigid transmission member, meeting the design requirements, and its overall structure is simple and the manufacturing cost is low.

[0014] Optionally, the bracket further comprises a fixing frame arranged on the main frame, the fixing frame is used to fix the syringe, and the fixing frame, the rigid transmission member and the guide cylinder are coaxially arranged along the moving direction of the rigid transmission member. During the test, the syringe is mounted on the fixing frame, and the fixing effect of the fixing frame on the syringe is utilized to make the moving part of the syringe, the rigid transmission member and the guide cylinder coaxially arranged, and the moving part moves along the axis, which will drive the rigid transmission member to move along the guide cylinder and along the axis; this design facilitates the rapid realization of accurate correspondence between the moving part and the rigid transmission member.

[0015] Optionally, the transmission assembly further comprises a first plug, the first plug is connected to the flexible transmission member, the rigid transmission member is provided with a first mounting groove, and the first plug is clamped in the first mounting groove. During the assembly process, the flexible transmission member is connected to the first plug, and the first plug is clamped in the first mounting groove, so that the connection between the flexible transmission member and the rigid transmission member is realized, the operation is simple, and the assembly work between the flexible transmission member and the rigid transmission member is convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 A schematic diagram of the three-dimensional structure of a syringe thrust test fixture provided in an embodiment of the present application;

[0018] Figure 2 A schematic front view of the syringe thrust test fixture provided in an embodiment of the present application in a first state;

[0019] Figure 3 A schematic front view of the syringe thrust test fixture provided in an embodiment of the present application in a second state;

[0020] Figure 4 A schematic cross-sectional view of a syringe thrust test fixture provided in an embodiment of the present application in a first state;

[0021] Figure 5 A schematic cross-sectional view of the syringe thrust test fixture provided in an embodiment of the present application in a second state;

[0022] Figure 6 A schematic diagram of the assembly of the first upper frame, the second upper frame, the top frame and the fixing frame provided in the embodiment of the present application;

[0023] Figure 7A schematic diagram of a first perspective of a fixing sleeve and a top frame body assembled together according to an embodiment of the present application;

[0024] Figure 8 A schematic diagram from a second perspective of the fixing sleeve and the top frame body provided in an embodiment of the present application being assembled together;

[0025] Fig. 9 A schematic diagram of the assembly of the first lower frame, the second lower frame, the guide frame and the bottom frame provided in an embodiment of the present application;

[0026] Fig.10 A first-view stereoscopic schematic diagram of a guide frame provided in an embodiment of the present application;

[0027] Fig.11 A second perspective stereoscopic schematic diagram of a guide frame provided in an embodiment of the present application;

[0028] Fig.12 A schematic diagram of the structure of a transmission assembly provided in an embodiment of the present application;

[0029] Fig.13 A first perspective stereoscopic image of a transmission roller provided in an embodiment of the present application;

[0030] Fig.14 A second perspective stereoscopic image of a transmission roller provided in an embodiment of the present application;

[0031] Fig.15 A first-view stereoscopic view of a rigid transmission member provided in an embodiment of the present application;

[0032] Fig.16 A second perspective stereoscopic image of a rigid transmission member provided in an embodiment of the present application;

[0033] Fig.17 A three-dimensional diagram of a bearing provided in an embodiment of the present application;

[0034] Fig.18 A first-view stereoscopic view of a flexible transmission member provided in an embodiment of the present application;

[0035] Fig.19 A second perspective stereoscopic image of a flexible transmission member provided in an embodiment of the present application;

[0036] Fig. 20 A first-perspective stereoscopic image of a weight block provided in an embodiment of the present application;

[0037] Fig.21 A second perspective stereoscopic image of a weight block provided in an embodiment of the present application;

[0038] Fig. 22 A third perspective stereogram of a weight block provided in an embodiment of the present application;

[0039] Fig.23 A three-dimensional diagram of a first plug block provided in an embodiment of the present application;

[0040] Fig.24 A first perspective stereoscopic image of a first upper frame provided in an embodiment of the present application;

[0041] Fig.25 A second perspective stereoscopic image of the first upper frame provided in an embodiment of the present application;

[0042] Fig.26 A first perspective stereoscopic image of a first lower frame provided in an embodiment of the present application;

[0043] Fig. 27 A second perspective stereoscopic image of the first lower frame provided in an embodiment of the present application;

[0044] Fig.28 A third perspective stereoscopic image of the first lower frame provided in an embodiment of the present application;

[0045] Fig.29 A schematic diagram of the structure of the chassis provided in the embodiment of the present application;

[0046] Fig.30 A schematic diagram of the structure of the screw provided in an embodiment of the present application.

[0047] Among them, the reference numerals in the figure are:

[0048] 1-bracket; 11-main frame; 111-top frame body; 112-bottom frame body; 1121-support bottom plate; 1122-support rib plate; 1123-positioning sleeve; 113-first frame body; 1131-first upper frame body; 1132-first lower frame body; 1133-first upper groove; 1134-first lower groove; 1135-first upper connecting ear; 1136-first lower connecting ear; 114-second frame body; 1141-second upper frame body; 1142-second lower frame body; 1143-second upper groove; 1144-second lower groove; 1145-second upper connecting ear; 1146-second lower connecting ear; 12-guide frame; 121-guide seat; 1211-guide groove; 1212-folding plate; 122-guide cylinder; 1221-guide hole; 13 -fixed frame; 131-fixed sleeve; 1311-axial through hole; 132-locking screw; 2-transmission assembly; 21-rigid transmission member; 211-limiting groove; 2111-first side wall; 2112-second side wall; 212-first installation groove; 213-first rope groove; 22-flexible transmission member; 221-pull rope; 2211-first knot; 2212-second knot; 23-transmission roller; 231-installation part; 232-diameter reducing part; 2321-step end face; 233-contact part; 24-first plug; 241-plug hole; 25-guide rod; 251-top surface of guide rod; 26-bearing; 261-inner ring; 262-outer ring; 3-resistance simulation member; 31-weight block; 311-second installation groove; 312-second rope groove; 4-screw. DETAILED DESCRIPTION

[0049] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0050] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0051] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0052] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0053] like Figures 1 to 5 As shown, an embodiment of the present application provides a syringe thrust test fixture, including a bracket 1, a transmission assembly 2 and a resistance simulation component 3. The transmission assembly 2 is movably mounted on the bracket 1, the resistance simulation component 3 is connected to the power output end of the transmission assembly 2, and the power input end of the transmission assembly 2 is used to connect to the moving part of the syringe. Under the drive of the moving part, the transmission assembly 2 can overcome the resistance provided by the resistance simulation component 3 and move relative to the bracket 1.

[0054] In the process of testing the syringe using the syringe thrust test fixture of the present application, the test rod of the thrust tester is used to apply thrust to the syringe without liquid medicine to push the moving part of the syringe to move. Under the connection between the power input end and the moving part, the moving part applies driving force to the power input end of the transmission component 2, and under the connection between the power output end and the resistance simulation part 3, the transmission component 2 transmits the driving force of the moving part to the resistance simulation part 3, and the resistance simulation part 3 also applies resistance to the transmission component 2, and under the drive of the moving part, the transmission component 2 can overcome the resistance provided by the resistance simulation part 3 and move relative to the bracket 1. In this way, the syringe completes the action of simulating injection. During this process, the syringe is subjected to the resistance formed by the syringe thrust test fixture, which simulates the resistance formed by the liquid medicine on the syringe when containing liquid medicine, thereby simulating the situation when the syringe injects liquid medicine without liquid medicine. The thrust data measured at this time is the thrust data when the syringe injects liquid medicine, thereby realizing the test of the thrust of the syringe, and this test method does not need to load liquid medicine into the syringe, which saves liquid medicine and reduces costs.

[0055] like Figure 1 As shown, the transmission assembly 2 in the embodiment of the present application includes a rigid transmission member 21 and a flexible transmission member 22 connected to each other, the rigid transmission member 21 has a power input end, and the flexible transmission member 22 has a power output end; the rigid transmission member 21 is movably connected to the bracket 1. When the moving part moves, a driving force is applied to the rigid transmission member 21, and the rigid transmission member 21 and the flexible transmission member 22 can overcome the resistance provided by the resistance simulation member 3 and move; the transmission assembly 2 adopts a combination of the rigid transmission member 21 and the flexible transmission member 22, so as to utilize the easy-to-change shape of the flexible transmission member 22, and facilitate the flexible setting of the positions of the rigid transmission member 21 and the resistance simulation member 3 and other components.

[0056] like Figure 1 As shown, in the embodiment of the present application, the transmission assembly 2 further includes a transmission roller 23, which is rotatably connected to the bracket 1, and the flexible transmission member 22 is wound around the transmission roller 23. The transmission roller 23 provides strong support for the flexible transmission member 22, and the transmission roller 23 rotates with the movement of the flexible transmission member 22 to reduce the friction resistance formed therebetween, thereby reducing the wear on the flexible transmission member 22, and extending the service life of the flexible transmission member 22.

[0057] like Figures 1 to 3 As shown, in the embodiment of the present application, the rigid transmission member 21 is arranged vertically, the transmission roller 23 is arranged horizontally, and the height of the transmission roller 23 is located between the end where the rigid transmission member 21 is connected to the flexible transmission member 22 and the power input end. This position design makes the interaction points between the moving part and the rigid transmission member 21, the interaction points between the rigid transmission member 21 and the flexible transmission member 22, and the interaction points between the flexible transmission member 22 and the transmission roller 23 staggered in the height direction, so that the various force points of the transmission assembly 2 are dispersed, thereby improving the stability of the operation of the transmission assembly 2.

[0058] like Fig.12 , Fig.15 and Fig.16 As shown, in the embodiment of the present application, a limiting groove 211 is provided on the side wall of the rigid transmission member 21, and the limiting groove 211 has a first side wall 2111 and a second side wall 2112 opposite to each other along the moving direction of the rigid transmission member 21, and the transmission roller 23 is located between the first side wall 2111 and the second side wall 2112, so as to abut against the first side wall 2111 and the second side wall 2112 respectively to limit the stroke of the rigid transmission member 21. The transmission roller 23 not only has the function of supporting the flexible transmission member 22, but also has a limiting function on the rigid transmission member 21, and this method of limiting the rigid transmission member 21 by abutting against the limiting groove 211 of the rigid transmission member 21 and the transmission roller 23, does not need to specially set a limiting member acting on the rigid transmission member 21, simplifies the structure, reduces the cost, and makes the syringe thrust test fixture more compact, small in size, and easy to carry.

[0059] like Figure 1 , Figures 9 to 11 As shown, in the embodiment of the present application, the bracket 1 includes a main frame 11 and a guide frame 12 disposed in the main frame 11, the guide frame 12 includes a vertically connected guide seat 121 and a guide cylinder 122, the guide seat 121 is installed in the main frame 11, the extension direction of the guide cylinder 122 is consistent with the movement direction of the rigid transmission member 21, and the rigid transmission member 21 is movably plugged into the guide cylinder 122. When the rigid transmission member 21 moves relative to the bracket 1, the guide cylinder 122 will effectively guide the rigid transmission member 21, so that the rigid transmission member 21 will accurately move along the set path, thereby improving the movement stability and accuracy of the transmission assembly 2.

[0060] like Figure 1 , Figure 4 and Figure 5 As shown, in the embodiment of the present application, the guide seat 121 is located between the driving roller 23 and the resistance simulation member 3, and as shown in FIG. Figure 3 , Fig.10 and Fig.11 As shown, a guide groove 1211 is provided on the guide seat 121, and the extension direction of the guide groove 1211 is consistent with the movement direction of the flexible transmission member 22 located between the transmission roller 23 and the resistance simulation member 3, and the flexible transmission member 22 located between the transmission roller 23 and the resistance simulation member 3 is movably accommodated in the guide groove 1211. The guide groove 1211 has a guiding effect on the flexible transmission member 22 located between the transmission roller 23 and the resistance simulation member 3, so that the flexible transmission member 22 can accurately move along the set path, thereby improving the stability and accuracy of the movement of the transmission assembly 2. Moreover, the guide seat 121 not only has a supporting effect on the guide cylinder 122, but also has a guiding effect on the flexible transmission member 22, which simplifies the structural design and makes the overall structure of the syringe thrust test fixture more compact.

[0061] like Figure 1 and Figure 2 As shown, in the embodiment of the present application, the main frame 11 includes a top frame 111, a bottom frame 112, a first frame 113 and a second frame 114. The top frame 111 and the bottom frame 112 are arranged at intervals along the movement direction of the rigid transmission member 21, and the first frame 113 and the second frame 114 are arranged at intervals along the direction perpendicular to the movement direction. The two ends of the transmission roller 23 are respectively rotatably connected to the first frame 113 and the second frame 114, and the two ends of the guide seat 121 are respectively fixedly connected to the first frame 113 and the second frame 114. The bracket 1 of this structure can provide stable support for the transmission component 2, and can provide the required movement space for the rigid transmission member 21, meet the design requirements, and its overall structure is simple and the manufacturing cost is low.

[0062] like Figure 1 and Figure 2 As shown, in the embodiment of the present application, the bracket 1 further includes a fixing frame 13 disposed on the main frame 11, and the fixing frame 13 is used to fix the syringe, and the fixing frame 13, the rigid transmission member 21 and the guide cylinder 122 are coaxially arranged along the moving direction of the rigid transmission member 21. During the test, the syringe is mounted on the fixing frame 13, and the fixing effect of the fixing frame 13 on the syringe is utilized to make the moving part of the syringe, the rigid transmission member 21 and the guide cylinder 122 coaxially arranged, and the moving part moves along the axis, which will drive the rigid transmission member 21 to move along the guide cylinder 122 and along the axis; this design facilitates the rapid realization of accurate correspondence between the moving part and the rigid transmission member 21.

[0063] like Figures 6 to 8As shown, the fixing frame 13 in the embodiment of the present application includes a fixing sleeve 131 fixed on the top frame body 111, and a locking screw 132 installed in a threaded hole on the side wall of the fixing sleeve 131, and the threaded hole is connected to the axial through hole 1311 of the fixing sleeve 131. During the test, the syringe is inserted into the axial through hole 1311 of the fixing sleeve 131, and the locking screw 132 in the threaded hole is screwed, and the locking screw 132 moves into the axial through hole 1311 until the locking screw 132 presses against the fixing part of the syringe to fix the fixing part of the syringe in the axial through hole 1311 to fix the syringe. After the test is completed, the locking screw 132 is loosened, and the syringe can be taken out from the axial through hole 1311, which facilitates the installation and disassembly of the syringe. In the embodiment of the present application, the fixing sleeve 131 is a clamp in the form of a circular sleeve. The threaded hole extends radially along the fixing sleeve 131, and the fixing sleeve 131 is provided with two threaded holes corresponding in the radial direction, and each threaded hole is provided with a locking screw 132. After the syringe is loaded into the axial through hole 1311, the two locking screws 132 are turned clockwise, and the two locking screws 132 are moved into the axial through hole 1311 until the syringe is clamped; after the test is completed, the two locking screws 132 are turned counterclockwise to loosen the syringe so that the syringe can be taken out from the axial through hole 1311. In the embodiment of the present application, the two locking screws 132 mainly play the role of fixing the syringe. The center lines of the two threaded holes intersect vertically with the center line of the axial through hole 1311 to facilitate the installation of the syringe in place. In another embodiment of the present application, other clamps or other structures can also be used to fix the syringe to prevent the syringe from being subjected to excessive resistance during the simulated injection, causing the syringe to retreat, thereby causing inaccurate test data. The embodiment of the present application adopts this method of fixing the syringe, which can achieve the fixation of different types of syringes, thereby meeting the needs of testing different types of syringes and improving the versatility of the syringe thrust test fixture.

[0064] like Figure 4 , Fig.16 and Fig.23 As shown, the transmission assembly 2 further includes a first plug 24, which is connected to the flexible transmission member 22. The rigid transmission member 21 is provided with a first mounting groove 212, and the first plug 24 is clamped in the first mounting groove 212. During the assembly process, the flexible transmission member 22 is connected to the first plug 24, and the first plug 24 is clamped in the first mounting groove 212, so that the connection between the flexible transmission member 22 and the rigid transmission member 21 is realized, the operation is simple, and the assembly work between the flexible transmission member 22 and the rigid transmission member 21 is convenient.

[0065] like Figure 1 and Figure 20 to Figure 22As shown, the resistance simulation part 3 in the embodiment of the present application adopts a weight block 31. When the moving part of the syringe drives the transmission component 2 to move, it will drive the weight block 31 to rise. In this process, the weight block 31 applies resistance to the transmission component 2 and the moving part of the syringe based on its own weight. By controlling the weight of the weight block 31, the embodiment of the present application can accurately simulate the resistance formed by the liquid medicine when the syringe injects the liquid medicine, which is easy to implement. In addition, this structure is simple and the manufacturing cost is low.

[0066] The moving part of the syringe in the embodiment of the present application specifically refers to the injection plunger of the syringe. Fig.12 , Fig.15 and Fig.16 As shown, in the embodiment of the present application, the rigid transmission member 21 adopts a guide rod 25, and the guide rod 25 is movably inserted in the guide hole 1221 of the guide cylinder 122; the guide rod 25 is fixed in the horizontal direction, so that the guide rod 25 moves accurately in the up and down direction and in the straight direction, that is, the guide rod 25 is guided to move along the central axis of the guide hole 1221 without skewing, and the fixing sleeve 131, the guide rod 25 and the guide cylinder 122 are coaxially arranged, so that the movement path of the guide rod 25 is in the same straight line as the thrust direction of the test rod and the injection push rod, reducing the problem of uneven force or excessive friction caused by the skewing of the guide rod 25 during the test process and causing inaccurate final test data. In other embodiments of the present application, linear bearings or other structures can also be used to provide fixing and guiding functions for the guide rod 25. The structure used in the embodiment of the present application to achieve the guide is relatively simple and has a low manufacturing cost. In the embodiment of the present application, the guide hole 1221 is a blind hole. A limit groove 211 is provided on the side wall of the guide rod 25 in the embodiment of the present application. In the embodiment of the present application, the flexible transmission member 22 is a pull rope 221 , and the pull rope 221 is wound around the transmission roller 23 .

[0067] like Figure 12 to Figure 14 As shown, in the embodiment of the present application, mounting portions 231 are provided at both ends of the transmission roller 23. The two mounting portions 231 are respectively mounted in the inner rings 261 of the two bearings 26. The outer rings 262 of the two bearings 26 are fixedly mounted on the bracket 1. The transmission roller 23 is supported by the two bearings 26 to improve the rotation flexibility of the transmission roller 23, so that the transmission roller 23 can rotate easily, thereby reducing the friction formed between the pull rope 221 and the transmission roller 23 when the pull rope 221 moves, thereby minimizing the resistance applied by the transmission component 2 to the moving part, so that the resistance to the moving part mainly comes from the resistance simulation component 3, that is, the gravity of the weight block 31, and then by controlling the weight of the weight block 31, the resistance formed by the liquid medicine on the injection push rod can be more accurately simulated. In the embodiment of the present application, the mounting portion 231 is cylindrical, so that the circumferential surface of the mounting portion 231 forms a good matching relationship with the inner circumferential surface of the inner ring 261 of the bearing 26, so that the transmission roller 23 can rotate in the circumferential direction. As shown Fig.17As shown, in the embodiment of the present application, the main body of the bearing 26 is cylindrical; the bearing 26 is a standard part.

[0068] like Figure 1 , Figures 24 to 28 As shown, in the embodiment of the present application, the first frame 113 includes a first upper frame 1131 and a first lower frame 1132. The first upper frame 1131 is provided with a first upper groove 1133, and the first lower frame 1132 is provided with a first lower groove 1134. The lower end of the first upper frame 1131 is fixedly connected to the upper end of the first lower frame 1132. The first upper groove 1133 and the first lower groove 1134 are combined to form a bearing mounting hole, and one of the bearings 26 is installed in the bearing mounting hole. Figure 1 , Figure 6 and Fig. 9 As shown, the second frame 114 includes a second upper frame 1141 and a second lower frame 1142, the second upper frame 1141 is provided with a second upper groove 1143, and the second lower frame 1142 is provided with a second lower groove 1144; the lower end of the second upper frame 1141 is fixedly connected to the upper end of the second lower frame 1142, the second upper groove 1143 and the second lower groove 1144 are combined to form another bearing mounting hole, and another bearing 26 is installed in the bearing mounting hole. During the assembly process, one bearing 26 is installed in the first lower groove 1134, and the other bearing 26 is installed in the second lower groove 1144, and then the first upper frame 1131 is fixedly connected with the first lower frame 1132, the first upper groove 1133 is matched with the first lower groove 1134, and the groove wall of the first upper groove 1133 and the groove wall of the first lower groove 1134 together clamp the outer ring 262 of one of the bearings 26 to limit the shaking of the bearing 26 in the groove; the second upper frame 1141 is fixedly connected with the second lower frame 1142, the second upper groove 1143 is matched with the second lower groove 1144, and the groove wall of the second upper groove 1143 and the groove wall of the second lower groove 1144 together clamp the outer ring 262 of the other bearing 26, thereby realizing the installation of the two bearings 26 on the first frame 113 and the second frame 114 respectively, which is simple to operate and convenient for the installation of the bearings 26. In the embodiment of the present application, the first upper groove 1133, the first lower groove 1134, the second upper groove 1143 and the second lower groove 1144 are semicircular grooves. The first upper groove 1133 and the second upper groove 1143 are arranged opposite to each other, and the first lower groove 1134 and the second lower groove 1144 are arranged opposite to each other.

[0069] In the embodiment of the present application, the upper end of the first upper frame 1131 and the upper end of the second upper frame 1141 are respectively fixedly connected to the two ends of the top frame 111, the fixed sleeve 131 is fixed to the middle of the top frame 111, and the middle of the top frame 111 is provided with a top plate through hole connected to the axial through hole 1311 of the fixed sleeve 131, so that the moving part can be smoothly ejected downward. The first upper frame 1131 and the second upper frame 1141 are symmetrically distributed with the axial through hole 1311 as the center. The first upper frame 1131 and the second upper frame 1141 are used to support the top frame 111 and the fixed sleeve 131 in the vertical direction, and provide the syringe with a movement space along the thrust direction. In the embodiment of the present application, the lower end of the first lower frame 1132 and the lower end of the second lower frame 1142 are respectively fixedly connected to the two ends of the bottom frame 112. In the embodiment of the present application, the main frame 11 is a rectangular frame structure as a whole.

[0070] like Figures 9 to 11 As shown, in the embodiment of the present application, folding plate portions 1212 are provided at both ends of the guide seat 121, and the two folding plate portions 1212 are fixedly connected to the first lower frame 1132 and the second lower frame 1142 respectively by screws 4, and the sides of the two folding plate portions 1212 are respectively fitted with the sides of the first lower frame 1132 and the second lower frame 1142. The guide cylinder 122 is fixed in the middle of the guide seat 121, and the guide groove 1211 is located at the side of the middle of the guide seat 121. The guide groove 1211 has a guiding effect on the pull rope 221, and also prevents the pull rope 221 from being interfered with in the vertical movement direction after it passes around the transmission roller 23. During the assembly process, the two screws 4 are respectively passed through the two through holes of the first lower frame 1132 and then screwed into the two threaded holes on the folding plate part 1212, and the screws 4 are turned clockwise to lock the first lower frame 1132 and the guide seat 121. The second lower frame 1142 and the guide seat 121 are locked in the same way to fix the guide seat 121 between the first lower frame 1132 and the second lower frame 1142. The guide seat 121 also supports the first lower frame 1132 and the second lower frame 1142.

[0071] like Fig.29As shown, in the embodiment of the present application, the bottom frame body 112 includes a supporting bottom plate 1121, two support ribs 1122 distributed at intervals, and a positioning sleeve 1123. The two support ribs 1122 are fixedly connected to the supporting bottom plate 1121, and the two support ribs 1122 are located below the supporting bottom plate 1121. The first lower frame body 1132 and the second lower frame body 1142 are located above the supporting bottom plate 1121, and the lower ends of the first lower frame body 1132 and the second lower frame body 1142 are respectively fixedly connected to the two ends of the supporting bottom plate 1121. The positioning sleeve 1123 is fixed to the middle part of the lower surface of the supporting bottom plate 1121, and the side wall of the positioning sleeve 1123 is provided with a positioning hole. During the test, the syringe thrust test fixture is placed on the test bench of the thrust tester, and the two support ribs 1122 are in direct contact with the test bench. The two support ribs 1122 distributed at intervals are conducive to stably placing the bracket 1 and the entire syringe thrust test fixture on the test bench; the positioning pins on the test are inserted into the positioning holes to more firmly fix the syringe thrust test fixture on the test bench. In the embodiment of the present application, the upper surface of the support base plate 1121 is a plane, and the lower surface of the support base plate 1121 can be a plane or other structure that cooperates with the test bench, which can ensure the stability of the entire syringe thrust test fixture. In the embodiment of the present application, the bottom frame body 112 can directly cooperate with the thrust tester for easy access.

[0072] like Figure 1 , Figure 6 , Fig. 9 and Figures 24 to 28As shown, in the embodiment of the present application, the upper and lower ends of the first upper frame 1131 are provided with first upper connecting ears 1135, the upper and lower ends of the second upper frame 1141 are provided with second upper connecting ears 1145, the upper and lower ends of the first lower frame 1132 are provided with first lower connecting ears 1136, and the upper and lower ends of the second lower frame 1142 are provided with second lower connecting ears 1146, one first upper connecting ear 1135 of the first upper frame 1131 is fixedly connected to the top frame 111 by screws 4, and the other first upper connecting ear 1131 of the first upper frame 1131 is fixedly connected to the top frame 111 by screws 4. 135 is fixedly connected to a first connecting ear of the first lower frame 1132 by screw 4, another first lower connecting ear 1136 of the first lower frame 1132 is fixedly connected to the support bottom plate 1121 by screw 4, two second upper connecting ears 1145 of the second upper frame 1141 are respectively fixedly connected to the top frame 111 and the second lower connecting ear 1146 of the second lower frame 1142 by screw 4, and another second lower connecting ear 1146 of the second lower frame 1142 is fixedly connected to the support bottom plate 1121 by screw 4. The upper and lower ends of the first upper frame 1131, the first lower frame 1132, the second upper frame 1141 and the second lower frame 1142 adopt a double-ear design to provide a fixing space for the screw 4 and also to reduce the weight of the syringe thrust test fixture. During the assembly process, pass the screw 4 through the through hole of the first upper connecting ear 1135, and then screw it into the threaded hole of the first lower connecting ear 1136, and turn the screw 4 clockwise to lock the first upper frame 1131 and the first lower frame 1132. Pass the screw 4 through the through hole of the supporting base plate 1121, and screw it into the threaded hole of the first lower connecting ear 1136, and turn the screw 4 clockwise to lock the base frame 112 and the first lower frame 1132. The second upper frame 1141 and the second lower frame 1142 are assembled in the same way. In the embodiment of the present application, the first frame 113 and the second frame 114 play a supporting role, and also provide a movable space for the movement of the injection push rod of the syringe, so as to realize simulated injection. In the embodiment of the present application, screws 4 are mainly used to realize the connection and fixation between components. The structure of screw 4 is as shown in Fig.30 As shown. In other embodiments of the present application, pins or welding methods can also be used to achieve the connection and fixation between components. After assembly, the top frame body 111 in the embodiment of the present application fits with the first upper connecting ear 1135 and the second upper connecting ear 1145. The corresponding first upper connecting ear 1135 fits with the first lower connecting ear 1136, and the corresponding second upper connecting ear 1145 fits with the second lower connecting ear 1146.

[0073] like Figure 12 to Figure 14As shown, in the embodiment of the present application, the transmission roller 23 includes two sections of variable diameter parts 232 and one section of contact part 233, and the contact part 233 is located in the middle of the two sections of variable diameter parts 232. The diameter of the variable diameter part 232 gradually increases from one end of the variable diameter part 232 and the contact part 233 to the other end of the variable diameter part 232, and the diameter of one end of the variable diameter part 232 and the contact part 233 is greater than or equal to the diameter of the contact part 233. The contact part 233 is cylindrical. The pull rope 221 bypasses the contact part 233 and is connected to the resistance simulation member 3. The design of the two sections of variable diameter parts 232 can effectively limit the pull rope 221 from sliding toward the two ends of the transmission roller 23, so as to enable the pull rope 221 to maintain a good contact and matching relationship with the contact part 233. The two sections of variable diameter parts 232 and one section of contact part 233 constitute the main body of the transmission roller 23, and the diameter of the main body gradually decreases from the two ends to the middle to a certain value, and the contact part 233 is the smallest diameter part of the main body. One end of the reducing portion 232 away from the contact portion 233 is fixedly connected to the mounting portion 231, and the diameter of the reducing portion 232 away from the contact portion 233 is larger than the diameter of the mounting portion 231. The step end surface 2321 at the end of the reducing portion 232 away from the contact portion 233 contacts and cooperates with the bearing end surface of the bearing 26, which acts as a limit for the bearing 26.

[0074] During the test, the pull rope 221 is wound around the contact arc surface of the contact portion 233 of the transmission roller 23, and the contact portion of the pull rope 221 with the contact arc surface accounts for 1 / 2 of the contact arc surface, so that the two ends of the pull rope 221 can drive the transmission roller 23 to rotate when subjected to tension, which is mainly used to reduce the friction resistance formed by the transmission component 2, so that the thrust formed by the injection push rod is mainly used to drive the weight block 31 to rise, so that the gravity of the weight block 31 is the resistance formed by the medicine during injection, so that it is convenient to select a weight block 31 of appropriate weight according to the characteristics of the medicine to simulate the actual injection situation, and simulate the normal injection situation without actually adding medicine. In addition, at least 1 / 2 of the contact arc surface is located in the limiting groove 211. When the guide rod 25 moves downward along the guide cylinder 122 to the set position, the first side wall 2111 of the limiting groove 211 abuts against the contact arc surface to limit the guide rod 25 from continuing to move downward; when the guide rod 25 moves upward along the guide cylinder 122 to the set position, the second side wall 2112 of the limiting groove 211 abuts against the contact arc surface to limit the guide rod 25 from moving upward. In this way, the guide rod 25 is always in the movement stroke. This stroke setting allows the syringe to be directly replaced for repeated measurements during the test process, which improves the test efficiency when the test sample volume is large.

[0075] like Figure 5 , Fig.16 , Fig.18 , Fig.19 and Fig.23As shown, in the embodiment of the present application, one end of the pull rope 221 passes through the block hole 241 of the first block 24 to form a first rope knot 2211, and the first rope knot 2211 abuts against the surface of the first block 24 to prevent the pull rope 221 from slipping out of the block hole 241, thereby realizing the connection between the pull rope 221 and the first block 24. The lower end of the guide rod 25 is provided with a first mounting groove 212 and a first rope groove 213 connected to the first mounting groove 212, the first block 24 is embedded in the first mounting groove 212, the bottom surface of the first mounting groove 212 is in contact with the top surface of the first block 24, and the pull rope 221 is located in the first rope groove 213, which facilitates the rapid connection and disconnection of the pull rope 221 and the guide rod 25. Similarly, the other end of the pull rope 221 passes through the block hole 241 of the second block to form a second knot 2212, and the second knot 2212 abuts against the surface of the second block to prevent the pull rope 221 from coming out of the second block. The weight block 31 is provided with a second mounting groove 311 and a second pull rope groove 312 connected to the second mounting groove 311, the second block is embedded in the second mounting groove 311, the top surface of the second block is in contact with the bottom surface of the second mounting groove 311, and the pull rope 221 is located in the second pull rope groove 312. This method facilitates the rapid connection and disconnection between the pull rope 221 and the weight block 31. The second block is taken out of the second mounting groove 311, and the pull rope 221 is removed from the second pull rope groove 312, so that the weight blocks 31 of different specifications can be quickly replaced to simulate different resistances. In the embodiment of the present application, the second block has the same structure as the first block 24. The top surface size of the first plug 24 is larger than that of the first rope groove 213, and the top surface size of the second plug is larger than that of the second rope groove 312. After the guide rod 25 is pushed downward, it drives the first plug 24 and one end of the rope 221 to move downward, and the rope 221 rotates on the transmission roller 23 to change the direction of the force, pulling the weight block 31 at the other end of the rope 221, thereby realizing the linkage of the components at both ends of the rope 221 and the mutual conversion of forces.

[0076] In the embodiment of the present application, the second mounting groove 311 is located at the center of the weight block 31 to lift the weight block 31 from the center to prevent the weight block 31 from having excessive friction with other objects during movement. The weight block 31 is mainly pulled up by the other end of the pull rope 221 and moves downward by its own weight.

[0077] During the test, the injection push rod is pushed downward and applies a downward force to the guide rod top surface 251 of the guide rod 25. The guide rod top surface 251 constitutes the power input end. The guide rod 25 drives the first plug 24 and the pull rope 221 to move downward together. At the same time, since the position of the transmission roller 23 is fixed, the second plug and the weight block 31 connected to the other end of the pull rope 221 move upward; conversely, when the guide rod top surface 251 of the guide rod 25 is not subjected to the downward force, the second plug and the weight block 31 at the other end of the pull rope 221 move downward, and the first plug 24 and the guide rod 25 are pulled upward by the pull rope 221.

[0078] During the assembly process, the guide rod 25 is inserted downward from the axial through hole 1311 into the guide hole 1221 of the guide cylinder 122, and the first rope groove 213 is convenient for determining the assembly direction of the guide rod 25. The main function of the first rope groove 213 is to allow the rope 221 to pass through, so that the rope 221 can avoid air in a straight line direction during movement, thereby achieving a 1:1 conversion of the actual force of the rope 221 on the transmission roller 23.

[0079] In the embodiment of the present application, the weight block 31 can be of standard specifications, and different resistances can be simulated by replacing different weight blocks 31 and connecting them with the pull rope 221. In the embodiment of the present application, the pull rope 221 can be a soft rope that can lift heavy objects.

[0080] In the embodiment of the present application, the syringe thrust test fixture is mainly used to convert the thrust of the syringe into a pulling force during the test, and pull up a simulated weight block 31 with a constant resistance. The friction resistance formed by the transmission component 2 based on its own structure can be ignored, thereby realizing a 1:1 conversion of the syringe thrust and the gravity formed by the weight block 31. The gravity of the weight block 31 simulates the resistance formed by the liquid medicine during injection. The weight of the weight block 31 in the embodiment of the present application is determined according to the resistance formed by the liquid medicine to the syringe, and the weight of the weight block 31 is equal to the resistance value formed by the liquid medicine to the syringe. In the embodiment of the present application, the weight block 31 is a part that can be quickly replaced. When there are different requirements, the corresponding weight block 31 can be replaced. In the embodiment of the present application, a 1.02KG weight block 31 is used to simulate the 10N resistance formed by the liquid medicine on the syringe.

[0081] In the embodiment of the present application, the weight block 31 drives the other end of the pull rope 221 and the second plug to descend due to its own weight, thereby pulling the first plug 24 at one end of the pull rope 221 and driving the guide rod 25 to rise. When the guide rod top surface 251 rises to the guide rod 25, it contacts the contact arc surface, thereby limiting the weight block 31 from continuing to fall. In this state, the guide rod 25 is always subjected to the upward force. When the guide rod 25 is not subjected to other forces, the entire syringe thrust test fixture is in a static state, such as Figure 4 As shown, this state can also be understood as the initial state of the entire syringe thrust test fixture.

[0082] Before using the syringe thrust test fixture in the embodiment of the present application to test the syringe, the measurement personnel need to test the thrust value required for a known qualified syringe to inject the drug when it contains liquid medicine, and then use the syringe thrust test fixture to test the syringe whose qualification is unknown, and compare the measured data with the thrust value of the known qualified syringe injected with the drug. If the thrust value is less than or equal to the thrust value of the known qualified syringe injected with the drug, the syringe is qualified.

[0083] The method for testing a syringe using the syringe thrust test fixture in the embodiment of the present application is as follows: placing the syringe thrust test fixture on the test bench, with the central axis of the axial through hole 1311 of the fixed sleeve 131 and the test rod in the same straight line to ensure that when the syringe is subsequently loaded into the fixed sleeve 131, the syringe and the test rod are also in the same straight line to prevent inaccurate position of applying thrust to the syringe, resulting in inaccurate test data; at the same time, the base frame 112 cooperates with the corresponding structure on the test bench, and the supporting ribs 1122 and the positioning sleeve 1123 can be embedded in the corresponding positioning grooves on the test bench, and the positioning pin on the test bench is inserted into the positioning hole to fix the syringe thrust test fixture; then, insert the syringe without liquid medicine into the axial through hole 1311 of the fixed sleeve 131 from top to bottom, with the injection end facing down, and turn clockwise. The two locking screws 132 on the fixing sleeve 131 fix the fixing part of the syringe to put the syringe in a state ready for injection; the thrust tester is started, and the test rod pushes the injection push rod of the syringe downward, and the injection push rod acts on the top surface 251 of the guide rod and pushes the guide rod 25, and the guide rod 25 drives the pull rope 221 to move, and the weight block 31 at the other end of the pull rope 221 is linked to complete the simulated injection. At this time, the thrust tester will display the change data of the thrust value of the entire injection process. The R&D and testing personnel will determine whether the syringe is qualified based on the test data. If the test data is greater than the thrust value of the known qualified syringe for injecting drugs, the syringe is unqualified; if a new syringe needs to be tested, directly turn the locking screw 132, loosen the syringe, remove the tested syringe, install the new syringe in the above manner and complete the test.

[0084] The original method for testing the thrust force of a syringe requires the steps of installing the liquid medicine on the syringe in advance, and then the corresponding fixture is used to fix the syringe, and then the fixture is placed on the test bench, the thrust tester is started, the injection push rod is pushed, and the injection is completed. At this time, the thrust tester displays the change data of the thrust value of the overall test process. The original test method takes 1 minute to test a syringe (additional time is required to install the liquid medicine), while the time required to test the syringe using the syringe thrust test fixture in the embodiment of the present application is 40 seconds, which improves the detection efficiency by 33%. The qualified rate of the syringe measured by the original test method is 96%, and the qualified rate of the syringe measured by the syringe thrust test fixture in the embodiment of the present application is 98%. The main reason is that the original test method will be affected by the different concentrations and viscosities of the liquid medicine, resulting in deviations in the test data, thereby reducing the overall qualified rate of the syringe. When the syringe is tested using the syringe thrust test fixture in the embodiment of the present application, it will not be affected by the different concentrations and viscosities of the liquid medicine, thereby improving the accuracy of the test.

[0085] The thrust tester in the embodiment of the present application can adopt the push-pull force tester in the prior art. The placement of the syringe thrust test fixture on the test bench in another embodiment of the present application can adopt the placement of other fixtures on the test bench in the prior art.

[0086] The syringe thrust test fixture in the embodiment of the present application has a simple structure, and can simulate the resistance value caused by the liquid medicine and various influencing factors during the injection process when the syringe is in normal use without liquid medicine. The resistance value formed by different liquid medicines on the syringe can be simulated by replacing the weight blocks 31 of different specifications. In addition, the syringe thrust test fixture in the embodiment of the present application can meet the needs of testing syringes of various specifications, which not only saves costs but also improves work efficiency.

[0087] In summary, the embodiments of the present application solve the problems that the existing test instruments cannot measure the thrust value required when the syringe injects the liquid medicine without the liquid medicine, and the existing fixture test is single and uneconomical to use. The syringe thrust test fixture in the embodiment of the present application is used to test the syringe, which is superior to the original test method in terms of test efficiency and accuracy; more importantly, the syringe thrust test fixture in the embodiment of the present application is used to test the syringe, and there is no need to fill the syringe with liquid medicine, which saves the test cost and greatly improves the economic efficiency of the product.

[0088] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A syringe thrust test fixture, characterized in that: It includes a bracket, a transmission component and a resistance simulation component. The transmission component is movably installed on the bracket. The resistance simulation component is connected to the power output end of the transmission component. The power input end of the transmission component is used to connect to the moving part of the syringe. Under the drive of the moving part, the transmission component can overcome the resistance provided by the resistance simulation component and move relative to the bracket.

2. The syringe thrust test fixture according to claim 1, characterized in that: The transmission assembly comprises a rigid transmission member and a flexible transmission member which are interconnected. The rigid transmission member has the power input end, and the flexible transmission member has the power output end. The rigid transmission member is movably connected to the bracket.

3. The syringe thrust test fixture according to claim 2, characterized in that: The transmission assembly also includes a transmission roller, which is rotatably connected to the bracket, and the flexible transmission member is wound around the transmission roller.

4. The syringe thrust test fixture according to claim 3, characterized in that: The rigid transmission member is arranged vertically, the transmission roller is arranged horizontally, and the height of the transmission roller is located between one end of the rigid transmission member connected to the flexible transmission member and the power input end.

5. The syringe thrust test fixture according to claim 3, characterized in that: A limiting groove is provided on the side wall of the rigid transmission member, and the limiting groove has a first side wall and a second side wall opposite to each other along the movement direction of the rigid transmission member. The transmission roller is located between the first side wall and the second side wall to abut against the first side wall and the second side wall respectively to limit the stroke of the rigid transmission member.

6. The syringe thrust test fixture according to claim 3, characterized in that: The bracket includes a main frame and a guide frame arranged in the main frame, the guide frame includes a vertically connected guide seat and a guide cylinder, the guide seat is installed in the main frame, the extension direction of the guide cylinder is consistent with the movement direction of the rigid transmission member, and the rigid transmission member is movably plugged into the guide cylinder.

7. The syringe thrust test fixture according to claim 6, characterized in that: The guide seat is located between the transmission roller and the resistance simulation member, and a guide groove is provided on the guide seat. The extension direction of the guide groove is consistent with the movement direction of the flexible transmission member located between the transmission roller and the resistance simulation member, and the flexible transmission member located between the transmission roller and the resistance simulation member is movably accommodated in the guide groove.

8. The syringe thrust test fixture according to claim 6, characterized in that: The main frame includes a top frame body, a bottom frame body, a first frame body and a second frame body, the top frame body and the bottom frame body are arranged at intervals along the movement direction of the rigid transmission member, the first frame body and the second frame body are arranged at intervals along a direction perpendicular to the movement direction, the two ends of the transmission roller are rotatably connected to the first frame body and the second frame body respectively, and the two ends of the guide seat are fixedly connected to the first frame body and the second frame body respectively.

9. The syringe thrust test fixture according to claim 6 or 8, characterized in that: The support also includes a fixing frame arranged on the main frame, the fixing frame is used to fix the syringe, and the fixing frame, the rigid transmission member and the guide cylinder are coaxially arranged along the moving direction of the rigid transmission member.

10. The syringe thrust test fixture according to claim 2, characterized in that: The transmission assembly further includes a first plug, which is connected to the flexible transmission member. The rigid transmission member is provided with a first mounting groove, and the first plug is clamped in the first mounting groove.

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