Assembly connection strength testing tool
By designing a component connection strength testing fixture, the problems of deformation and inconsistent clamping load caused by excessive clamping force in the tensile strength test of the connection between the rod and the guide seat were solved, thus achieving accuracy and consistency of the test results.
Patent Information
- Application Number
- CN202520195351.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-07
- Publication Date
- 2026-01-30
- Estimated Expiration
- 2035-02-07
AI Technical Summary
In the prior art, during the tensile strength test of the connection between the rod and the guide seat, excessive clamping force of the clamps can cause deformation and cracking of the guide seat and deformation of the adhesive layer, affecting the accuracy of the test results. Furthermore, since the rod is a rigid body, the clamping load is inconsistent, affecting the tensile results.
Design a component connection strength testing fixture, including a fixture body that is snapped into the lower clamp of a tensile testing machine, and the part to be tested connected to the fixture body. Through the cooperation of the limiting section and the clamp, the lower clamp is prevented from clamping the guide seat, and only the upper clamp is used for tensile testing, ensuring that the test state is consistent with the actual use.
To ensure the validity of test results, avoid damage to the conduit seat and adhesive layer, reduce clamping load differences, and improve the accuracy of test results.
Smart Images
Figure CN223856899U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to medical instrument detection field especially, and it relates to a kind of component connection strength test tool. BACKGROUND
[0002] In the process of balloon catheter production, the tensile strength of the connection between the rod body (usually a high polymer material outer tube or a metal material hypotube) and the catheter seat needs to be sampled and tested to ensure that its performance meets the requirements, thereby maximizing the avoidance of the problem of abnormal separation of the rod body and the catheter seat. This requires sampling the rod body and the catheter seat, and then connecting the assembly to a tensile testing machine for tensile testing.
[0003] The existing testing method directly uses the upper and lower clamps of the tensile testing machine to clamp the rod body and the catheter seat. However, the clamping force of the clamps is very large, typically exceeding 500N. When clamping the catheter seat, the catheter seat is easily deformed and cracked under pressure, resulting in damage. This clamping method does not match the actual application scenario. At this time, the adhesive layer between the rod body and the catheter seat (typically using UV curing glue or instant drying glue, the cured glue has a certain hardness) is also easily deformed irregularly under pressure, causing the adhesive layer to peel off from the rod body and the catheter seat, affecting the authenticity of the test results.
[0004] In addition, when the rod body is a hypotube, the entire assembly can be approximated as a rigid body, and the overall tensile modulus is large. If the upper and lower clamps are clamped separately in the conventional manner, the entire assembly will be in a slightly stretched or extruded state, i.e., the assembly is stretched or extruded by a very small stroke. However, due to the large tensile modulus of the assembly, the sensor already has a large load before the sample is officially stretched, and the load value varies greatly each time the assembly is clamped (typically, the breaking force of the assembly is 210-230N, and the load after clamping generally fluctuates within the range of -10 to 50N). Whether zeroing is performed before stretching or not, it will have a significant impact on the stretching results. UTILITY MODEL CONTENTS
[0005] The utility model aims at solving the shortcomings in the prior art and provides a component connection strength test tool.
[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a component connection strength test tool, comprising:
[0007] a tool body;
[0008] the tool body is connected to the lower clamp of the tensile testing machine,
[0009] a to-be-tested member is connected to the tool body, and the other end of the to-be-tested member is connected to the upper clamp of the tensile testing machine.
[0010] As a further description of the above technical solution: the tool body comprises a connecting section, the connecting section is provided with a first limiting section and a second limiting section which are integrally connected.
[0011] As a further description of the above technical solution: the first limiting section is coplanar with the upper end surface of the connecting section, and the first limiting section extends to both sides of the connecting section.
[0012] As a further description of the above technical solution: the second limiting section is coplanar with the lower end surface of the connecting section, and the second limiting section extends to both sides of the connecting section.
[0013] As a further description of the above technical solution: the first limiting section is parallel to the second limiting section.
[0014] As a further description of the above technical solution: the length of the first limiting section is greater than the length of the second limiting section.
[0015] As a further description of the above technical solution: the upper end surface of the connecting section is provided with a mounting hole connected with the to-be-tested part.
[0016] As a further description of the above technical solution: the first limiting section is located above the lower clamp head, and the second limiting section is located below the lower clamp head.
[0017] As a further description of the above technical solution: the distance between the first limiting section and the second limiting section is greater than the thickness of the lower clamp head.
[0018] As a further description of the above technical solution: the upper clamp head clamps the to-be-tested part through a clamping block.
[0019] The above technical solution has the following advantages or beneficial effects:
[0020] 1. By designing the test tool to be connected with the to-be-tested part, the to-be-tested part is in the same state as when the instrument is normally used, and when testing, only the tension of the tension meter is applied to the connecting part of the rod body and the catheter seat assembly, and no damage is caused to the adhesive layer of the catheter seat and the bonding part, thereby ensuring the effectiveness of the test results. BRIEF DESCRIPTION OF DRAWINGS
[0021] Fig. 1 The structure diagram of the test tool of the present application is shown in the figure.
[0022] Fig. 2 The perspective view of the tool body of the present application is shown in the figure.
[0023] Fig. 3 The sectional view of the tool body of the present application is shown in the figure.
[0024] Legend:
[0025] 1. Tooling body; 11. Connecting section; 12. First limiting section; 13. Second limiting section; 14. Mounting hole; 2. Lower chuck; 3. Test piece; 4. Upper chuck; 5. Clamping block. Detailed Implementation
[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0027] Reference Figs. 1-3 An embodiment of this utility model provides a component connection strength testing fixture, comprising: fixture body 1; fixture body 1 is snapped into the lower clamp 2 of a tensile testing machine, a test piece 3 is connected to the fixture body 1, and the other end of the test piece 3 is connected to the upper clamp 4 of the tensile testing machine.
[0028] In this embodiment, the test fixture is designed to be connected to the test piece 3. The test piece 3 is in the same state as when the instrument is in normal use. The test piece 3 includes a rod and a guide seat. During the test, the connection between the rod and the guide seat assembly is only subjected to the tension of the tension gauge, and will not damage the adhesive layer of the guide seat and the bonding part, thus ensuring the validity of the test results.
[0029] The tooling body 1 includes a connecting section 11, which is provided with an integrated first limiting section 12 and a second limiting section 13; the first limiting section 12 is coplanar with the upper end surface of the connecting section 11 and extends to both sides of the connecting section 11; the second limiting section 13 is coplanar with the lower end surface of the connecting section 11 and extends to both sides of the connecting section 11; the first limiting section 12 and the second limiting section 13 are parallel; the length of the first limiting section 12 is greater than the length of the second limiting section 13.
[0030] In this embodiment, the connecting segment 11, the first limiting segment 12, and the second limiting segment 13 form an "I" shape, and the first limiting segment 12 and the second limiting segment 13 limit the upper and lower end faces of the lower clamp 2.
[0031] The upper end face of the connecting section 11 is provided with a mounting hole 14, which is connected to the test piece 3.
[0032] In the embodiment, the mounting hole 14 can be provided with a luer connector, which is a standard component with a standard luer connector on one side and an external thread on the other side, and the external thread is connected with the mounting hole 14 through a thread connection, and the luer connector is connected with the measured piece 3.
[0033] The first limiting section 12 is located above the lower clamp head 2, the second limiting section 13 is located below the lower clamp head 2, and the distance between the first limiting section 12 and the second limiting section 13 is greater than the thickness of the lower clamp head 2.
[0034] In the embodiment, the distance between the first limiting section 12 and the second limiting section 13 is greater than the thickness of the lower clamp head 2, so that the lower clamp head 2 can be clamped between the first limiting section 12 and the second limiting section 13, and the position of the tool body 1 can be adjusted before testing.
[0035] The upper clamp head 4 clamps the measured piece 3 through the clamping block 5.
[0036] In the embodiment, the upper clamp head 4 clamps the rod body of the measured piece 3 through the clamping block 5, drives the upper clamp head 4 to move upward for tension test, and the clamping block 5 is the existing structure of the tension meter.
[0037] Working principle: the I-shaped tool body 1 is clamped in the lower clamp head 2, and the lower clamp head 2 does not clamp during stretching, only the upper clamp head 4 clamps the measured piece 3. At this time, since there is no restriction of the lower clamp head 2, the entire tool body 1 will be slightly pulled up by the upper clamp head 4 (originally, the first limiting section 12 of the tool body 1 is in contact with the upper end surface of the lower clamp head 2, at this time, a small gap is formed between them), and the reading on the tension sensor is always the value of the gravity of the tool body 1 and the measured piece 3 (since the weight of the tool body 1 does not change, the components of the sampled measured piece 3 are almost identical in material and length, so the sum of the weights of different measured pieces 3 and the tool body 1 has high consistency), and after zeroing, the tension test is carried out, at this time, the upper clamp head 4 clamps the measured piece 3 and moves upward at a predetermined stretching speed for a stroke of several millimeters, until the second limiting section 13 is in contact with the lower end surface of the lower clamp head 2 to limit the upward movement, and then the stretching test is started, and an accurate tensile strength value can be obtained.
[0038] Finally, it should be pointed out that the above description is only a preferred embodiment of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or make equivalent replacements to some technical features, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.
Claims
1. An assembly joint strength test tool characterized by, Include: Tool body (1); The tool body (1) is clamped with the lower clamp (2) of the tensile testing machine, The tool body (1) is connected with the measured piece (3), and the other end of the measured piece (3) is connected with the upper clamp (4) of the tensile testing machine.
2. The test fixture of claim 1, wherein: The tool body (1) includes a connecting section (11), and the connecting section (11) is provided with an integrated first limiting section (12) and a second limiting section (13).
3. The test fixture of claim 2, wherein: The first limiting section (12) is coplanar with the upper end surface of the connecting section (11), and the first limiting section (12) extends to both sides of the connecting section (11).
4. The test fixture of claim 2, wherein: The second limiting section (13) is coplanar with the lower end surface of the connecting section (11), and the second limiting section (13) extends to both sides of the connecting section (11).
5. The test fixture of claim 2, wherein: The first limiting section (12) is parallel to the second limiting section (13).
6. The test fixture of claim 2, wherein: The length of the first limiting section (12) is greater than the length of the second limiting section (13).
7. The test fixture of claim 2, wherein: The upper end surface of the connecting section (11) is provided with a mounting hole (14) connected with the measured piece (3).
8. The test fixture of claim 2, wherein: The first limiting section (12) is located above the lower clamp (2), and the second limiting section (13) is located below the lower clamp (2).
9. The test fixture of claim 2, wherein: The distance between the first limiting section (12) and the second limiting section (13) is greater than the thickness of the lower clamp (2).
10. The test fixture of claim 1, wherein: The upper clamp (4) clamps the measured piece (3) through the clamping block (5).