A multi-point force applying and deformation measuring device for rigid testing of syringe barrels

Abstract

The present application relates to injection needle tube test and technical field, specifically to a kind of for injection needle tube rigidity test multi-point force and deformation measuring device, including pedestal, control switch, control box and rack are fixedly installed on the upper end of pedestal, the inside of rack is slidably connected with sliding base, the front end of sliding base is fixedly connected with extension plate, tension and compression force sensor is fixedly installed at the bottom of extension plate, multi-point force and deformation measuring device further include clamping mechanism and multi-point force mechanism, clamping mechanism is arranged on the upper end of pedestal and the bottom of tension and compression force sensor, and clamping mechanism in the upper end of pedestal is provided with puncture force test assembly, for the fixture of various purposes is fixed, the structure need not frequently twist screw, both greatly shorten fixture replacement time, improve test efficiency, also avoid the damage of tooth sliding due to repeated friction of screw hole, reduce the cost of component scrapping and re-tapping, guarantee long-term stable use of device.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of injection needle tube testing, and particularly relates to a multi-point force applying and deformation measuring device for rigid testing of an injection needle tube. BACKGROUND

[0002] As a key medical device for directly delivering drugs into the body of a patient, the quality of an injection needle tube is related to treatment safety and effect, and if there are problems such as insufficient toughness, insufficient rigidity or poor connection, it is easy to cause drug leakage, injection failure or even injury to the patient. At the same time, the medical industry has strict quality standards and regulatory requirements for injection needle tubes, so it is necessary to ensure that the performance meets the standards through comprehensive testing to protect the safety of patients, improve treatment effect, and meet the needs of industry standards and market competition.

[0003] When the performance of the injection needle tube is tested, a plurality of test items such as plug puncture force testing, syringe needle pull-out force testing, and syringe needle and needle base connection force testing need to be completed. Because different tests have different functional requirements for clamps, clamps with corresponding functions need to be frequently replaced. At present, most clamps use screw fixing methods, but frequent disassembly and assembly of screws not only significantly prolongs the replacement time, but also easily causes excessive wear of screw holes and threads, thereby affecting the assembly stability. In extreme cases, the component where the screw hole is located may be directly scrapped due to severe wear and tear, and needs to be re-tapped or replaced. In addition, if the injection needle tube is slightly tilted during the testing process, it will significantly affect the test data and increase the difficulty of data analysis. However, the existing clamps are mostly clamped in a two-point force applying manner, which is easy to cause uneven force and thus causes the needle tube to tilt, seriously affecting the accuracy of the test data.

[0004] Therefore, a multi-point force applying and deformation measuring device for rigid testing of an injection needle tube is provided. SUMMARY

[0005] The present application aims to provide a multi-point force applying and deformation measuring device for rigid testing of an injection needle tube to solve the problems of cumbersome clamp replacement and uneven force application mentioned in the background.

[0006] In order to achieve the above object, the present application provides the following technical scheme: a multi-point force applying and deformation measuring device for rigid testing of injection needle tubes, comprising a base, a control switch, a control box and a rack fixedly installed at the upper end of the base, a sliding seat slidably connected in the interior of the rack, an extension plate fixedly connected at the front end of the sliding seat, a tension and compression force sensor fixedly installed at the bottom end of the extension plate, a clamping mechanism and a multi-point force applying mechanism, the clamping mechanism is arranged at the upper end of the base and the bottom end of the tension and compression force sensor, and is used for fixing clamps for various purposes, and a puncture force testing assembly is clamped in the clamping mechanism at the upper end of the base, the multi-point force applying mechanism is clamped on the clamping mechanism, and a needle tube to be tested is clamped at the bottom end of the multi-point force applying mechanism, and is used for centrally clamping various types of needle tubes to be tested for various types of testing.

[0007] Preferably, one end of the extension plate is fixedly connected with a connecting frame, the other end of the connecting frame is fixedly installed with a displacement sensor, a grating is arranged behind the displacement sensor, and the grating is fixedly installed on the rack.

[0008] Preferably, the clamping mechanism comprises a clamp replacement seat fixedly installed at the bottom end of the tension and compression force sensor, cylindrical barrels rotatably connected at the two sides in the interior of the clamp replacement seat, reset springs and limiting plates movably connected in the interior of the cylindrical barrels, first and second clamping columns fixedly connected at the sides of the two groups of limiting plates, the first and second clamping columns are inserted in first clamping holes, and the first clamping holes are opened in first connecting columns.

[0009] Preferably, the limiting plates are polygonally arranged, and the limiting plates are matched with the internal cavities of the cylindrical barrels.

[0010] Preferably, a first clamping column inclined surface is opened at the side of the first clamping column, a first clamping column opening is opened at one end of the first clamping column close to the center of the clamp replacement seat, a guide clamping groove is opened in the inner wall of the first clamping column opening, a second clamping column inclined surface is opened at the side of the second clamping column, a second clamping column opening is opened at one end of the second clamping column close to the center of the clamp replacement seat, a guide clamping strip is fixedly connected with the inner wall of the second clamping column opening, and the guide clamping groove and the guide clamping strip are matched.

[0011] Preferably, a knob is arranged at the side of the clamp replacement seat, the knob penetrates the clamp replacement seat through a rotating rod and is fixedly connected with one group of cylindrical barrels, and a pointing mark is opened at the outside of the knob.

[0012] Preferably, the multi-point force applying mechanism comprises a first connecting column clamped in the clamp replacement seat, the first connecting column is fixedly installed at the upper end of a trial clamp, a control turntable is threadedly connected at the outside of the trial clamp, symmetrical two groups of handles are fixedly connected at the two sides of the control turntable, a guide cylinder is rotatably connected at the bottom end of the control turntable, and the guide cylinder is sleeved on the trial clamp.

[0013] Preferably, the inside of the guide cylinder is provided with two symmetrical groups of first guide openings and second guide openings, the side walls of the first guide openings and the second guide openings are provided with guide column grooves, the guide column grooves are slidably connected with guide columns, the guide columns are fixedly installed on both sides of the guide strip, the outer ends of the guide strip are fixedly connected with clamping blocks, and the four groups of clamping blocks jointly clamp the needle tube to-be-tested member.

[0014] Preferably, the puncture force test assembly comprises a second connecting column clamped in the clamping mechanism on the upper end of the base, the outer side of the second connecting column is provided with a second clamping hole, the upper end of the second connecting column is fixedly installed with a rubber plug holder, and the upper end of the rubber plug holder is fixedly installed with a rubber plug.

[0015] The beneficial effects of the present application are:

[0016] 1. The present application designs a clamping mechanism cooperating with a multi-point force applying mechanism, and utilizes a knob to synchronously drive a first clamping column and a second clamping column to rotate through a polygonal limiting plate, so that the inclined surfaces of the two clamping columns are consistent, when the first connecting column is inserted, the two clamping columns will be pressed into the cylindrical barrel along the inclined surfaces, and after the knob is loosened, the restoring force of the reset spring can push the two clamping columns to be clamped into the first clamping hole to complete the fixing, and the knob can be rotated in reverse to unlock and disassemble, so that the multi-point force applying mechanism or the puncture force test assembly can be quickly disassembled, the structure does not need to be frequently screwed, the clamping fixture replacement time is greatly shortened, the test efficiency is improved, the damage of the screw hole caused by repeated friction is avoided, the cost of part scrapping and re-tapping is reduced, and the long-term stable use of the device is ensured.

[0017] 2. The present application designs a multi-point force applying mechanism, and utilizes the linkage structure of the control turntable, the guide cylinder, the guide strip and the clamping blocks, so that the four groups of clamping blocks can be horizontally moved through the cooperation of the guide column grooves and the guide columns, the needle tube to-be-tested member is uniformly applied with force at multiple points, the needle tube to-be-tested member is effectively prevented from deviating, the test error caused by clamping deviation is eliminated, the test data such as rubber plug puncture force and needle extraction force are more accurate, and the difficulty of data analysis is reduced.

[0018] 3. The present application designs a puncture force test assembly cooperating with a multi-point force applying mechanism, utilizes a tension and compression force sensor to record the pressure change in the test process of the needle tube to-be-tested member in real time, and a displacement sensor synchronously captures displacement change information through a grating, and the data of the two is transmitted to a control box for analysis and then fed back to an external computer. The pressure and displacement data are synchronously collected and accurately recorded, comprehensive data support is provided for various performance tests related to the rigidity of the injection needle tube, and the reliability of the test results is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the present application or the prior art, the drawings needed to be used in the following embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are only a part of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort.

[0020] Figure 1 It is a whole perspective schematic view of a multi-point force applying and deformation measuring device for rigid testing of injection needle tube according to an embodiment of the present application.

[0021] Figure 2 It is a perspective schematic view of a multi-point force applying and deformation measuring device for rigid testing of injection needle tube according to an embodiment of the present application. Figure 1 It is an enlarged schematic view of position A in FIG. 4.

[0022] Figure 3 It is a perspective schematic view of a clamping mechanism and a multi-point force applying mechanism of a multi-point force applying and deformation measuring device for rigid testing of injection needle tube according to an embodiment of the present application.

[0023] Figure 4 It is a perspective schematic view of a multi-point force applying mechanism and a puncture force testing assembly of a multi-point force applying and deformation measuring device for rigid testing of injection needle tube according to an embodiment of the present application.

[0024] Figure 5 It is a sectional view schematic view of a clamping mechanism of a multi-point force applying and deformation measuring device for rigid testing of injection needle tube according to an embodiment of the present application.

[0025] Figure 6 It is a perspective schematic view of a first clamping column and a second clamping column of a multi-point force applying and deformation measuring device for rigid testing of injection needle tube according to an embodiment of the present application.

[0026] Figure 7 It is a sectional view schematic view of a multi-point force applying mechanism of a multi-point force applying and deformation measuring device for rigid testing of injection needle tube according to an embodiment of the present application.

[0027] Figure 8 It is a perspective schematic view of a multi-point force applying and deformation measuring device for rigid testing of injection needle tube according to an embodiment of the present application. Figure 7 It is an enlarged schematic view of position B in FIG. 6.

[0028] Figure 9 It is a perspective schematic view of a guide cylinder of a multi-point force applying and deformation measuring device for rigid testing of injection needle tube according to an embodiment of the present application.

[0029] In the figure, the following marks are used: 1, base; 11, control switch; 12, control box; 13, rack; 14, sliding seat; 141, extension plate; 15, tension and compression force sensor; 16, connecting frame; 17, displacement sensor; 18, grating.

[0030] 2. Clamping mechanism; 21. Fixture changing seat; 22. Cylindrical tube; 23. Knob; 231. Indicator; 24. Return spring; 25. Limiting plate; 26. First locking pin; 261. First locking pin inclined surface; 262. First locking pin notch; 263. Guide slot; 27. Second locking pin; 271. Second locking pin inclined surface; 272. Second locking pin notch; 273. Guide strip;

[0031] 3. Multi-point force application mechanism; 31. Trial assembly fixture; 32. First connecting column; 321. First locking hole; 33. Control turntable; 331. Handle; 34. Guide cylinder; 35. First guide port; 36. Second guide port; 37. Guide column groove; 38. Guide bar; 381. Guide column; 39. Clamping block;

[0032] 4. Puncture force testing assembly; 41. Rubber stopper holder; 42. Second connecting post; 421. Second locking hole; 43. Rubber stopper; 5. Needle to be tested. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0034] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0035] Please see Figures 1 to 9The application provides a technical scheme: a multi-point force applying and deformation measuring device for rigid testing of injection needle tubes, which comprises a base 1, a control switch 11, a control box 12 and a rack 13 are fixedly installed at the upper end of the base 1, a sliding seat 14 is slidably connected in the interior of the rack 13, an extension plate 141 is fixedly connected to the front end of the sliding seat 14, a tension and compression force sensor 15 is fixedly installed at the bottom end of the extension plate 141, the multi-point force applying and deformation measuring device further comprises a clamping mechanism 2 and a multi-point force applying mechanism 3, the clamping mechanism 2 is arranged at the upper end of the base 1 and the bottom end of the tension and compression force sensor 15, and is used for fixing clamps for various purposes, a puncture force testing assembly 4 is clamped in the clamping mechanism 2 at the upper end of the base 1, the multi-point force applying mechanism 3 is clamped on the clamping mechanism 2, and a needle tube to be tested 5 is clamped at the bottom end of the multi-point force applying mechanism 3, and is used for centrally clamping various types of needle tubes to be tested 5 to perform various types of tests, one end of a connecting frame 16 is fixedly connected to the side surface of the extension plate 141, the other end of the connecting frame 16 is fixedly installed with a displacement sensor 17, a grating 18 is arranged behind the displacement sensor 17, and the grating 18 is fixedly installed on the rack 13, the puncture force testing assembly 4 comprises a second connecting column 42 clamped in the clamping mechanism 2 at the upper end of the base 1, a second clamping hole 421 is formed in the outer side of the second connecting column 42, a rubber plug holder 41 is fixedly installed at the upper end of the second connecting column 42, and a rubber plug 43 is fixedly installed at the upper end of the rubber plug holder 41.

[0036] By adopting the above technical scheme, when the soft rubber plug puncture force is tested, the control switch 11 drives the servo structure in the control rack 13 to work through the system in the control box 12, so that the sliding seat 14 is lowered, which is a common technology at present and will not be described in detail here, the needle tube to be tested 5 at the bottom end of the multi-point force applying mechanism 3 is inserted into the rubber plug 43 at the upper end of the rubber plug holder 41 under the action of the sliding seat 14, then the tension and compression force sensor 15 records the pressure change information, at the same time, the displacement sensor 17 records the displacement change information through the grating 18, finally the tension and compression force sensor 15 and the displacement sensor 17 respectively transmit the pressure change and displacement change information to the control box 12, and the control box 12 transmits the analyzed data to the external computer, which is beneficial to the real-time recording of the pressure change of the needle tube to be tested 5 in the test process by the tension and compression force sensor 15, the synchronous capture of the displacement change information by the displacement sensor 17 through the grating 18, and the transmission of the data of the two to the control box 12 for analysis and feedback to the external computer. The synchronous collection and accurate recording of the pressure and displacement data are realized, comprehensive data support is provided for various performance tests related to the rigidity of the injection needle tube, and the reliability and persuasiveness of the test results are ensured.

[0037] As an embodiment of the application, Figure 3 , Figure 5 and Figure 6As shown, the clamping mechanism 2 comprises a clamp replacement seat 21 fixedly installed at the bottom end of the tensile and compressive force sensor 15, two sides of the interior of the clamp replacement seat 21 are rotationally connected with cylindrical barrels 22, the interiors of the cylindrical barrels 22 are movably connected with return springs 24 and limiting plates 25, the sides of the two groups of limiting plates 25 are fixedly connected with first clamping columns 26 and second clamping columns 27 respectively, the first clamping columns 26 and the second clamping columns 27 are inserted into first clamping holes 321, the first clamping holes 321 are opened on first connecting columns 32, the limiting plates 25 are polygonally arranged, the limiting plates 25 are matched with the internal cavities of the cylindrical barrels 22, the side of the first clamping column 26 is provided with a first clamping column inclined surface 261, one end of the first clamping column 26 close to the center of the clamp replacement seat 21 is provided with a first clamping column gap 262, the inner wall of the first clamping column gap 262 is provided with a guide clamping groove 263, the side of the second clamping column 27 is provided with a second clamping column inclined surface 271, one end of the side of the second clamping column 27 close to the center of the clamp replacement seat 21 is provided with a second clamping column gap 272, the inner wall of the second clamping column gap 272 is fixedly connected with a guide clamping strip 273, the guide clamping groove 263 and the guide clamping strip 273 are matched, the side of the clamp replacement seat 21 is provided with a knob 23, the knob 23 penetrates through the clamp replacement seat 21 through a rotating rod and is fixedly connected on one group of cylindrical barrels 22, the outer side of the knob 23 is provided with a pointing mark 231.

[0038] By adopting the above technical scheme, because the performance of the test injection needle tube needs to be tested, many test items such as plug force test, injector needle pulling force test, injector needle and needle base connecting force test and the like are needed, so different function clamps need to be frequently replaced. The existing clamp replacement is mostly fixed by screws. However, frequent screw disassembly not only greatly increases the replacement time, but also easily causes excessive friction and wear of the screw hole threads, affects the assembly stability, and in severe cases may cause the component at the screw hole to be directly scrapped, requiring re-tapping or replacement of parts. When the clamp needs to be replaced, first, rotate the knob 23. Because the limiting plate 25 is polygonally arranged, the knob 23 can drive the first clamping column 26 to rotate through the cylindrical barrel 22 and the limiting plate 25. Because the first clamping column 26 is provided with a first clamping column opening 262, the second clamping column 27 is provided with a second clamping column opening 272, and the first clamping column opening 262 is provided with a guide clamping groove 263 matched with the guide clamping strip 273 in the second clamping column opening 272, the first clamping column 26 can drive the second clamping column 27 to rotate. Then, observe the pointing mark 231, so that the first clamping column inclined surface 261 on the first clamping column 26 and the second clamping column inclined surface 271 on the second clamping column 27 are both downward. Then, insert the first connecting column 32 from the bottom end of the clamp replacement seat 21. The first connecting column 32 is pressed into the two groups of cylindrical barrels 22 along the first clamping column inclined surface 261 and the second clamping column inclined surface 271, respectively. Finally, the restoring force of the two groups of return springs 24 pushes the outer ends of the first clamping column 26 and the second clamping column 27 into the first clamping hole 321 through the two groups of limiting plates 25, respectively, so as to fixedly install the multi-point force applying mechanism 3. Similarly, the multi-point force applying mechanism 3 can be disassembled, and the puncture force test assembly 4 is disassembled on another set of clamping mechanism 2 by the second connecting column 42 and the second clamping hole 421 by using the same principle. It is beneficial to use the knob 23 to synchronously drive the first clamping column 26 and the second clamping column 27 to rotate through the polygonal limiting plate 25, so that the inclined surfaces of the two are oriented in the same direction. When the first connecting column 32 is inserted, it will press the two clamping columns into the cylindrical barrel 22 along the inclined surface. After loosening, the restoring force of the return spring 24 can push the two clamping columns to be fixedly installed together. Reverse rotation of the knob can unlock and disassemble, so as to facilitate quick disassembly of the multi-point force applying mechanism 3 or the puncture force test assembly 4. The structure does not need to frequently twist the screw, which greatly shortens the clamp replacement time, improves the test efficiency, avoids the damage of the screw hole due to repeated friction, reduces the cost of part scrapping and re-tapping, and ensures long-term stable use of the device.

[0039] As an embodiment of the present application, Figure 4 , Figure 7 , Figure 8 and Figure 9As shown, the multi-point force applying mechanism 3 comprises a first connecting column 32 clamped in the clamp replacement seat 21, the first connecting column 32 is fixedly installed at the upper end of the trial clamp 31, a first clamping hole 321 is formed on the outer side of the first connecting column 32, a control turntable 33 is threadedly connected to the outer side of the trial clamp 31, symmetrically two groups of handles 331 are fixedly connected to the two sides of the control turntable 33, a guide cylinder 34 is rotatably connected to the bottom end of the control turntable 33, the guide cylinder 34 is sleeved on the trial clamp 31, symmetrically two groups of first guide holes 35 and second guide holes 36 are formed in the inner portion of the guide cylinder 34, guide column grooves 37 are formed on the two sides of the side walls of the first guide holes 35 and the second guide holes 36, guide columns 381 are slidably connected in the guide column grooves 37, the guide columns 381 are fixedly installed on the two sides of a guide strip 38, clamp blocks 39 are fixedly connected to the outer ends of the guide strip 38, and four groups of clamp blocks 39 jointly clamp the needle tube to-be-tested member 5.

[0040] By adopting the above technical scheme, because the slight skew of the needle tube to-be-tested member 5 will greatly affect the test data and increase the difficulty of data analysis, the multi-point force can be applied to the needle tube to-be-tested member 5, so that the needle tube to-be-tested member 5 can be clamped in the center, and the accuracy of the data can be greatly increased. First, the needle tube to-be-tested member 5 is placed between the four groups of clamp blocks 39, then the control turntable 33 is rotated by the handles 331, because the control turntable 33 is rotatably connected with the guide cylinder 34, and the guide cylinder 34 is limited by the guide strip 38, so the guide cylinder 34 descends with the control turntable 33, then because the first guide holes 35 and the second guide holes 36 are formed in the inner portion of the guide cylinder 34, and the guide column grooves 37 are formed in the first guide holes 35 and the second guide holes 36, so the guide cylinder 34 drives the four groups of guide strips 38 to move horizontally through the guide column grooves 37 and the guide columns 381, so that the four groups of clamp blocks 39 expand or contract, so that the four groups of clamp blocks 39 can apply force to the needle tube to-be-tested member 5 in the center, which is convenient for clamping the needle tube to-be-tested member 5 for various types of testing, and is conducive to the linkage structure of the control turntable 33, the guide cylinder 34, the guide strip 38 and the clamp block 39, the four groups of clamp blocks 39 can move horizontally through the cooperation of the guide column grooves 37 and the guide columns 381, and the needle tube to-be-tested member 5 can be uniformly applied force from multiple points, which can effectively avoid the deviation of the needle tube to-be-tested member 5, ensure that it is clamped in the center, eliminate the test error caused by the clamping deviation, make the test data such as rubber plug puncture force and needle pull-out force more accurate, and reduce the difficulty of data analysis.

[0041] Working principle: Because of the performance test of the test injection needle tube, many test items such as rubber plug force test, injector needle pull-out force test, injector needle and needle base connection force test need to be done, so different function clamps need to be frequently replaced. The existing clamp replacement is mostly fixed by screws. However, frequent disassembly and assembly of screws not only greatly increases the replacement time, but also easily causes excessive friction and wear of screw holes, affects the assembly stability, and in severe cases may cause the parts with screw holes to be directly scrapped, requiring re-tapping or replacing parts. When the clamp needs to be replaced, first rotate the knob 23. Because the limiting plate 25 is polygonally arranged, the knob 23 can drive the first clamping column 26 to rotate through the cylindrical barrel 22 and the limiting plate 25. Because the first clamping column 26 is provided with a first clamping column opening 262, the second clamping column 27 is provided with a second clamping column opening 272, and the first clamping column opening 262 is provided with a guide clamping groove 263 matched with the guide clamping strip 273 in the second clamping column opening 272, the first clamping column 26 can drive the second clamping column 27 to rotate. Then observe the pointing mark 231, so that the first clamping column inclined surface 261 on the first clamping column 26 and the second clamping column inclined surface 271 on the second clamping column 27 are both downward. Then insert the first connecting column 32 from the bottom end of the clamp replacement seat 21. The first connecting column 32 is pressed into the two groups of cylindrical barrels 22 along the first clamping column inclined surface 261 and the second clamping column inclined surface 271, respectively. Finally, the restoring force of the two groups of return springs 24 pushes the outer ends of the first clamping column 26 and the second clamping column 27 into the first clamping hole 321 through the two groups of limiting plates 25, respectively, so as to fix and install the multi-point force applying mechanism 3. Similarly, the multi-point force applying mechanism 3 can be disassembled. The puncture force test assembly 4 is disassembled on another set of clamping mechanism 2 by the same principle through the second connecting column 42 and the second clamping hole 421.

[0042] The slight skew of the needle tube to be tested 5 can greatly affect the test data and increase the difficulty of data analysis. Therefore, the needle tube to be tested 5 can be centered and clamped by applying force to multiple points, which can greatly increase the accuracy of the data. First, place the needle tube to be tested 5 between the four groups of clamping blocks 39. Then rotate the control turntable 33 by the handle 331. Because the control turntable 33 is rotationally connected with the guide cylinder 34, and the guide cylinder 34 is limited by the guide strips 38, the guide cylinder 34 descends with the control turntable 33. Then because the guide cylinder 34 is internally provided with the first guide opening 35 and the second guide opening 36, and the first guide opening 35 and the second guide opening 36 are both provided with inclined guide column grooves 37, the guide cylinder 34 drives the four groups of guide strips 38 to move horizontally through the guide column grooves 37 and the guide column 381, so that the four groups of clamping blocks 39 can expand or contract, thereby enabling the four groups of clamping blocks 39 to apply force to multiple points to center and clamp the needle tube to be tested 5, facilitating the clamping of the needle tube to be tested 5 for various types of tests.

[0043] The above merely describes preferred embodiments of the present application and is not used to limit the present application, and any modification, equivalent replacement, and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0044] In addition, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be combined appropriately to form other embodiments that those skilled in the art can understand.

Claims

1. A multi-point force application and deformation measurement device for rigidity testing of injection needle tubes, comprising a base (1), wherein a control switch (11), a control box (12), and a frame (13) are fixedly installed on the upper end of the base (1), a slide (14) is slidably connected inside the frame (13), an extension plate (141) is fixedly connected to the front end of the slide (14), and a tension / compression sensor (15) is fixedly installed at the bottom end of the extension plate (141), characterized in that: The multi-point force application and deformation measurement device also includes a clamping mechanism (2) and a multi-point force application mechanism (3). The clamping mechanism (2) is set at the upper end of the base (1) and the bottom end of the tension and compression sensor (15) for fixing various types of clamps. The clamping mechanism (2) at the upper end of the base (1) is fitted with a puncture force testing component (4). The multi-point force application mechanism (3) is fitted on the clamping mechanism (2). The bottom end of the multi-point force application mechanism (3) is fitted with a needle tube test piece (5) for clamping various types of needle tube test pieces (5) in the center for various types of tests. The clamping mechanism (2) includes a clamp changing seat (21) fixedly installed at the bottom of the tension / compression sensor (15). A cylindrical tube (22) is rotatably connected to both sides of the clamp changing seat (21). A return spring (24) and a limiting plate (25) are movably connected inside the cylindrical tube (22). A first locking post (26) and a second locking post (27) are fixedly connected to the sides of the two sets of limiting plates (25), respectively. Both the first locking post (26) and the second locking post (27) are inserted into a first locking hole (321), which is located on a first connecting post (32). The limiting plate (25) is polygonal and adapts to the internal cavity of the cylindrical tube (22). A first locking post inclined surface (261) is provided on the side of the first locking post (26). 6) A first locking notch (262) is provided at one end near the center of the clamp changing seat (21). A guide groove (263) is provided on the inner wall of the first locking notch (262). A second locking slope (271) is provided on the side of the second locking post (27). A second locking notch (272) is provided at one end near the center of the clamp changing seat (21) on the side of the second locking post (27). A guide strip (273) is fixedly connected to the inner wall of the second locking notch (272). The guide groove (263) and the guide strip (273) are compatible. A knob (23) is provided on the side of the clamp changing seat (21). The knob (23) passes through the clamp changing seat (21) through a rotating rod and is fixedly connected to a set of cylindrical tubes (22). An indicator (231) is provided on the outer side of the knob (23).

2. The multi-point force application and deformation measurement device for testing the rigidity of injection needles according to claim 1, characterized in that, One end of a connecting frame (16) is fixedly connected to the side of the extension plate (141), and a displacement sensor (17) is fixedly installed at the other end of the connecting frame (16). A grating (18) is provided behind the displacement sensor (17), and the grating (18) is fixedly installed on the frame (13).

3. The multi-point force application and deformation measurement device for testing the rigidity of injection needles according to claim 1, characterized in that, The multi-point force application mechanism (3) includes a first connecting column (32) that is locked in the fixture changing seat (21). The first connecting column (32) is fixedly installed on the upper end of the test fixture (31). The test fixture (31) is threadedly connected to a control turntable (33). Two sets of symmetrical handles (331) are fixedly connected to both sides of the control turntable (33). The bottom end of the control turntable (33) is rotatably connected to a guide cylinder (34). The guide cylinder (34) is sleeved on the test fixture (31).

4. The multi-point force application and deformation measurement device for testing the rigidity of injection needles according to claim 3, characterized in that, The guide tube (34) has two symmetrical sets of first guide ports (35) and second guide ports (36) inside. The side walls of the first guide ports (35) and second guide ports (36) are provided with guide post grooves (37). The guide post (381) is slidably connected inside the guide post groove (37). The guide post (381) is fixedly installed on both sides of the guide strip (38). The outer end of the guide strip (38) is fixedly connected with a clamping block (39). The four sets of clamping blocks (39) together clamp the needle tube to be tested (5).

5. A multi-point force application and deformation measurement device for testing the rigidity of an injection needle according to claim 1, characterized in that, The puncture force testing assembly (4) includes a second connecting post (42) that is clamped in the upper clamping mechanism (2) of the base (1). A second locking hole (421) is provided on the outer side of the second connecting post (42). A rubber plug holder (41) is fixedly installed on the upper end of the second connecting post (42). A rubber plug (43) is fixedly installed on the upper end of the rubber plug holder (41).

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