Spring probe structure for testing

Abstract

This invention discloses a spring probe structure for testing, comprising a needle head, a spring, and a needle tube. The spring is disposed within the needle tube. The needle head includes a needle tail portion disposed within the needle tube and in contact with one end of the spring, and a needle head portion disposed outside the needle tube. A boss is provided between the needle head and the needle tail portion. A needle shaft portion is provided between the needle head and the boss. The needle shaft portion sequentially includes a first shaft, a second shaft, and a third shaft. A first recessed step portion is provided at the connection between the boss and the needle tail portion. The end of the spring near the needle tail portion is engaged within the first step portion. The needle tube is provided with at least one elastic and bendable spring piece portion that cooperates with the second and third shafts. The spring piece portion is engaged at the second step portion formed by the third shaft and the boss. This invention eliminates the need for a crimping machine or dotting machine in the traditional assembly process, making assembly more convenient and faster, and improving production efficiency.

Description

Technical Field

[0001] This invention relates to the technical field of spring probes, and more specifically to a spring probe structure for testing. Background Technology

[0002] A test probe is a spring-type probe consisting of three basic components: a needle tip, a spring, and a syringe tube. Typically, the probe is assembled by crimping or dotting to confine part of the needle tip inside the syringe tube. This allows the needle tip to move within the syringe tube after contacting the object being tested without falling out, thus completing the testing process. Test probes prioritize cost reduction and efficiency while meeting functional requirements.

[0003] Conventional probe structures, such as Figure 1 As shown, the part of the needle inside the syringe is stepped, the syringe is cylindrical, and the tail of the syringe is tapered to prevent the spring inside the syringe from detaching. The assembly process involves first installing the spring into the syringe, then installing part of the needle into the syringe. After reaching the appropriate position, the material of the syringe is squeezed to deform it. The deformed part is stuck in the stepped part of the needle, preventing the needle from detaching from the syringe and allowing it to move towards the spring end. Common methods of squeezing the syringe are edge rolling or dotting. Both of these methods require a suitable edge rolling machine or dotting machine for production. The production capacity is related to the number of machines equipped, which to some extent reduces production efficiency and increases production costs. Summary of the Invention

[0004] To overcome the aforementioned problems, the present invention aims to provide a spring probe structure for testing, which eliminates the need for edge-rolling or dotting machines in the traditional assembly process, making assembly more convenient and faster, improving production efficiency, and reducing production costs.

[0005] To achieve the above objectives, the technical solution adopted by this invention is: a spring probe structure for testing, comprising a needle head, a spring, and a needle tube. The spring is disposed within the needle tube. The needle head includes a needle tail portion disposed within the needle tube and in contact with one end of the spring, and a needle head portion disposed outside the needle tube. After the needle head contacts the object being tested, it simultaneously compresses the spring along with the needle tail portion, causing the needle head to move inward into the needle tube. A boss is provided between the needle head and the needle tail portion, and a needle shaft portion is provided between the needle head and the boss portion. The needle shaft portion sequentially includes a first shaft, a second shaft, and a third shaft. One end of the first shaft is connected to the needle head, and the other end is connected to one end of the second shaft. The other end of the second shaft is connected to one end of the third shaft, and the other end of the third shaft is connected to the boss. The second shaft is configured as a frustum structure. The connection between the boss and the needle tail is provided with an inwardly recessed first step. The end of the spring near the needle tail is locked in the first step. The needle tube is provided with at least one elastic and bendable spring piece that cooperates with the second and third shafts. The spring piece is locked in the second step formed by the third shaft and the boss.

[0006] Preferably, the diameter of the end of the second shaft near the first shaft end is larger than the diameter of the end near the third shaft end.

[0007] Preferably, the diameter of the first shaft is larger than the diameter of the third shaft.

[0008] Preferably, the tail of the needle is configured as a frustum structure.

[0009] Preferably, there are two spring clips.

[0010] Preferably, the needle is made of copper alloy.

[0011] The beneficial effects of this invention are: it eliminates the production process of edge rolling machines or dotting machines required in the traditional assembly process, making assembly more convenient and faster, improving production efficiency, reducing production costs, making production capacity not limited by the number of edge rolling machines or dotting machines, increasing the stability of resistance values, and making replacement easy. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the probe structure in the background art;

[0013] Figure 2 This is a schematic diagram of the overall structure of this embodiment;

[0014] Figure 3 This is a schematic diagram of the assembly of the needle and spring in this embodiment;

[0015] Figure 4 This is a schematic diagram of the overall structure of the needle in this embodiment;

[0016] Figure 5 This is a partial structural diagram of the needle in this embodiment;

[0017] Figure 6 This is a schematic diagram of the needle tube in this embodiment;

[0018] Figure 7 for Figure 6 A schematic diagram of the cross-sectional structure along the AA direction.

[0019] In the diagram: 1. Needle tip; 2. Spring; 3. Needle tube; 4. Needle tail; 5. Needle head; 6. Boss; 7. Needle shaft; 8. First shaft; 9. Second shaft; 10. Third shaft; 11. First step; 12. Spring piece; 13. Second step. Detailed Implementation

[0020] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0021] See Figures 2-7 This embodiment discloses a spring probe structure for testing, including a needle head 1, a spring 2, and a needle tube 3. The spring 2 is disposed inside the needle tube 3. The needle head 1 includes a needle tail 4 disposed inside the needle tube 3 and in contact with one end of the spring 2, and a needle head 5 disposed outside the needle tube 3. After the needle head 5 contacts the object to be tested, it simultaneously compresses the spring 2 with the needle tail 4, causing the needle head 1 to move into the needle tube 3, thus completing the test. A boss 6 is provided between the needle head 5 and the needle tail 4, and a needle shaft portion 7 is provided between the needle head and the boss. The needle shaft 7 includes a first shaft 8, a second shaft 9, and a third shaft 10 in sequence. One end of the first shaft 8 is connected to the needle head 5, and the other end is connected to one end of the second shaft 9. The other end of the second shaft 9 is connected to one end of the third shaft 10. The other end of the third shaft 10 is connected to the boss 6. The second shaft 9 is configured as a frustum structure. The diameter of the first shaft 8 is larger than the diameter of the third shaft 10. The diameter of the end of the second shaft 9 near the first shaft 8 is larger than the diameter of the end near the third shaft 10.

[0022] The connection between the boss 6 and the needle tail 4 is provided with an inwardly recessed first step 11, and the end of the spring 2 near the needle tail 4 is stuck in the first step 11; the needle tube 3 is provided with at least one elastic and bent spring piece 12 that cooperates with the second shaft 9 and the third shaft 10, and the spring piece 12 is stuck in the second step 13 formed by the third shaft 10 and the boss 6.

[0023] In one embodiment, the needle tail 4 is configured as a frustum structure, with the radius of the end near the boss 6 being larger than the radius of the end away from the boss 6, so that the end of the spring 2 can be locked in the first step 11.

[0024] In one embodiment, two spring pieces 12 are provided, and the two spring pieces 12 are symmetrically arranged about the third axis 10. The two spring pieces 12 move synchronously, making their locking effect more stable.

[0025] In use, first, the last 2-3 turns of the spring 3 are secured at the first step 11 so that the spring 3 and the needle 1 are locked together and will not easily fall off, forming a semi-finished product. The needle tube 3 is made by stamping, and two bent spring parts 12 are stamped on the cylindrical needle tube 3. The needle tube 3 is made of copper alloy, so the two spring parts 12 have good elasticity. The semi-finished product assembled with the needle 1 and the spring 2 is inserted into the needle tube 3. During the insertion process, the two spring parts 12 will be spread apart. When the spring parts 12 reach the second step 13 and are locked in the second step 13, the spring parts 12 return to their original shape, and the assembly is completed.

[0026] The bent part of the spring piece 12 will be locked in the second step part 13 to prevent the needle 1 from disengaging. In the initial state, the needle tail 4 of the needle 1 is pressed against the spring 2 inside the needle tube 3, and the needle 1 and the spring 2 are locked together and the contact is stable. When the probe is working, the needle head 5 of the needle 1 moves towards the needle tail 4, and the spring piece 12 is pushed open along the third axis 10 towards the second axis 9 under the action of pressure. At this time, the needle 1 and the spring 2 are pressed together and the contact is stable.

[0027] When the probe reaches the end of its service life, simply remove the semi-finished product assembled with the needle 1 and spring 2 and reinsert a new semi-finished product. The needle tube 3 and the spring part 12 can be reused.

[0028] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A spring probe structure for testing, comprising a needle tip, a spring, and a needle tube, wherein the spring is disposed within the needle tube, the needle tip includes a needle tail portion disposed within the needle tube and in contact with one end of the spring, and a needle head portion disposed outside the needle tube, wherein after the needle head portion contacts the object to be tested, it simultaneously compresses the spring along with the needle tail portion, causing the needle head portion to move into the needle tube, and a boss is provided between the needle head portion and the needle tail portion, characterized in that... A needle shaft is provided between the needle head and the boss. The needle shaft includes a first shaft, a second shaft, and a third shaft in sequence. One end of the first shaft is connected to the needle head, and the other end is connected to one end of the second shaft. The other end of the second shaft is connected to one end of the third shaft, and the other end of the third shaft is connected to the boss. The second shaft is configured as a frustum structure. A first step with an inward indentation is provided at the connection between the boss and the needle tail. The end of the spring near the needle tail is locked in the first step. At least one elastic and bendable spring piece is provided on the needle tube, which cooperates with the second shaft and the third shaft. The spring piece is locked at the second step formed by the third shaft and the boss.

2. The test spring probe structure according to claim 1, characterized in that, The diameter of the end of the second shaft near the first shaft end is larger than the diameter of the end near the third shaft end.

3. The spring probe structure for testing according to claim 1, wherein, The diameter of the first shaft is larger than the diameter of the third shaft.

4. The spring probe structure for testing according to claim 1, wherein, The tail of the needle is designed as a frustum structure.

5. The spring probe structure for testing according to claim 1, wherein, The spring section is provided in two parts.

6. The spring probe structure for testing according to claim 1, wherein, The needle is made of copper alloy.

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