Large-current spring type probe

Abstract

The utility model relates to the field of probes, in particular to a large-current spring type probe. The large-current spring type probe comprises a needle tube assembly, a needle head, a spring and an elastic restraining piece, the needle head is arranged in the needle tube assembly in a sliding fit mode and electrically makes contact with the inner wall of the needle tube assembly, and the needle head is configured to be not allowed to be disengaged from the needle tube assembly in the direction away from the needle tube assembly; the spring is arranged between the needle head and the needle tube assembly, and the needle head compresses the spring in the process of sliding towards the needle tube assembly; one of the needle head and the needle tube assembly is provided with a contact pin, and the elastic restraining piece is electrically installed in the other one, elastically restrains the contact pin and makes electrical contact with the contact pin. According to the utility model, the stable wire contact between the elastic constraint member and the pin is increased, the high current can be borne, the vibration resistance is realized, and the hot plugging can be realized.

Description

Technical Field

[0001] The utility model relates to the field of probes, in particular to a large current spring type probe. Background Art

[0002] Traditional spring-type probes generally include a needle tube, a needle and a spring. The needle is slidably fitted in the needle tube and is not allowed to detach from the needle tube in the direction away from the needle tube. The spring is set between the needle and the needle tube, and the needle compresses the spring when it slides toward the needle tube. Spring-type probes with this structure can generally only withstand relatively small currents. Once the current exceeds the standard, the temperature will rise by more than 30°C. Moreover, it cannot be plugged in or out while powered on, as plugging in or out while powered on may burn out the entire spring-type probe. In addition, it is not resistant to vibration and is prone to instantaneous disconnection. Summary of the invention

[0003] The technical problem to be solved by the utility model is to overcome the defects of the prior art and provide a large current spring type probe, which increases the stable wire contact between the elastic constraint and the pin, can withstand large current, is vibration-resistant, and can be plugged and unplugged under power.

[0004] In order to solve the above technical problems, the technical solution of the utility model is: a large current spring-type probe, comprising:

[0005] Needle tube assembly;

[0006] a needle, slidably fitted in the needle tube assembly and in electrical contact with an inner wall of the needle tube assembly, and configured to not be allowed to detach from the needle tube assembly in a direction away from the needle tube assembly;

[0007] a spring, disposed between the needle and the needle tube assembly, wherein the needle compresses the spring when sliding toward the needle tube assembly;

[0008] An elastic restraining member, one of the needle head and the needle tube assembly has a pin, and the elastic restraining member is electrically installed in the other, elastically restrains the pin, and is in electrical contact with the pin.

[0009] A specific structure of an elastic restraint member is further provided, wherein the elastic restraint member is a claw spring.

[0010] A mounting position of a claw spring is further provided. The claw spring is electrically mounted on the inner wall of the needle tube assembly with the large end facing the needle head. The insertion needle is arranged on the needle head.

[0011] In order to further facilitate the installation of the claw spring, the inner circumferential wall of the needle tube assembly is provided with a step surface, and the large-mouth end of the claw spring has a flange, and the surface of the flange away from the needle head abuts against the step surface.

[0012] In order to further prevent the claw spring from axial displacement, one end of the spring abuts against the needle head, and the other end abuts against the surface of the flange close to the needle head.

[0013] Another specific structure of an elastic restraint member is further provided, wherein the elastic restraint member is a crown spring.

[0014] A mounting position of a crown spring is further provided, wherein the crown spring is electrically inserted into the needle head, and the needle is disposed in the needle tube assembly.

[0015] Furthermore, the needle tube assembly includes a needle tube and a connector, the insertion pin is arranged on the connector, the connector is inserted into the needle tube, and the insertion pin is located in the needle tube.

[0016] In order to further prevent the connector from axially displacing relative to the needle tube, the outer circumferential wall of the connector is provided with an annular groove extending along its circumference, and the inner circumferential wall of the needle tube is provided with an annular protrusion extending along its circumference, the annular protrusion is embedded in the annular groove, and the end of the annular protrusion facing the opening of the needle tube is provided with a conical guide portion for guiding the connector to be inserted therein.

[0017] After adopting the above technical scheme, the utility model adds a matching structure between the elastic constraint part and the insertion pin, and the elastic constraint part constrains the insertion pin to achieve stable electrical contact, increase the contact area between the needle head and the needle tube assembly, and the assembly is stable and reliable, so that the entire spring-type probe can withstand relatively large currents, and the ability to resist vibration is enhanced. It will not be instantly disconnected when subjected to vibration, and the probe will not be damaged even if it is plugged in and out while powered. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of a high current spring-type probe in the first embodiment of the utility model;

[0019] Figure 2 This is a schematic diagram of the structure of a high current spring-type probe in the second embodiment of the utility model;

[0020] In the figure, 1, needle tube assembly; 11, needle tube; 111, annular protrusion; 1111, conical guide portion; 12, connector; 121, annular groove; 101, step surface; 2, needle head; 3, spring; 4, elastic restraint; 4a, claw spring; 41a, flange; 4b, crown spring; 5, plug pin. DETAILED DESCRIPTION

[0021] In order to make the content of the utility model more clearly understood, the utility model is further described in detail below based on specific embodiments and in conjunction with the accompanying drawings.

[0022] like Figure 1 , Figure 2As shown, a high current spring-type probe comprises:

[0023] Needle tube assembly 1;

[0024] The needle 2 is slidably mounted in the needle tube assembly 1 and is in electrical contact with the inner wall of the needle tube assembly 1, and is configured to not be allowed to separate from the needle tube assembly 1 in a direction away from the needle tube assembly 1;

[0025] The spring 3 is disposed between the needle 2 and the needle tube assembly 1, and the spring 3 is compressed when the needle 2 slides toward the needle tube assembly 1;

[0026] The elastic restraint 4 , one of the needle 2 and the needle tube assembly 1 has a pin 5 , and the elastic restraint 4 is electrically installed in the other one, elastically restrains the pin 5 , and is in electrical contact with the pin 5 .

[0027] The head of the needle assembly 1 may be in a closed shape, constraining the needle 2 so that the needle 2 cannot be separated from the needle assembly 1 in a direction away from the needle assembly 1. Steps may also be provided on the outer peripheral wall of the needle 2 and the inner peripheral wall of the needle assembly 1, and the steps on the inner peripheral wall of the needle assembly 1 abut against the steps on the outer peripheral wall of the needle, thereby constraining the needle 2 so that the needle 2 cannot be separated from the needle assembly 1 in a direction away from the needle assembly 1.

[0028] The solutions involved in the above embodiments are described in detail below in conjunction with specific embodiments.

[0029] Embodiment 1

[0030] like Figure 1 As shown, a high current spring-type probe comprises a needle tube assembly 1, a needle 2, a spring 3 and an elastic constraint 4. The needle 2 is slidably mounted in the needle tube assembly 1 and is in electrical contact with the inner wall of the needle tube assembly 1. The spring 3 is disposed between the needle 2 and the needle tube assembly 1. The needle 2 compresses the spring 3 when sliding toward the needle tube assembly 1.

[0031] The elastic restraint 4 is a claw spring 4a, which is electrically mounted on the inner wall of the needle tube assembly 1 with the wide end facing the needle 2. The insertion needle 5 is arranged on the needle 2, 55 is inserted into the claw spring 4a, elastically restrained by the claw spring 4a, and electrically contacted with the claw spring 4a.

[0032] In this embodiment, the claw spring 4a is generally a machined beryllium copper spring sheet, and the portion used to constrain the pin 5 is in a claw shape.

[0033] Without the claw spring 4a, this spring-type probe can generally only withstand a current of less than 8A. If it exceeds 8A, the temperature will rise by more than 30°C, and it cannot be plugged in and out under power, and it is not resistant to vibration and is prone to instantaneous disconnection. After adding the matching structure of the claw spring 4a and the plug pin 2, the claw spring 4a constrains the plug pin 2 to achieve stable electrical contact, increase the contact area between the needle head 2 and the needle tube assembly 1, and the assembly is stable and reliable, so that the entire spring-type probe can withstand a relatively large current, and can carry a current of less than 30A, and the ability to resist vibration is enhanced, and it will not be instantly disconnected when subjected to vibration, and the probe will not be damaged even if it is plugged in and out under power.

[0034] Embodiment 2

[0035] Based on the first embodiment, Figure 1 As shown, the inner peripheral wall of the needle tube assembly 1 is provided with a step surface 101, and the large end of the claw spring 4a has a flange 41a, and the surface of the flange 41a away from the needle 2 abuts against the step surface 101. One end of the spring 3 abuts against the needle 2, and the other end abuts against the surface of the flange 41a close to the needle 2. One end of the spring 3 abuts against the needle 2, and the other end abuts against the surface of the flange 41a close to the needle 2.

[0036] Such an arrangement not only facilitates the installation of the claw spring 4a on the inner circumferential wall of the needle tube assembly 1 , but also prevents the claw spring 4a from axial displacement when the needle 2 slides along the needle tube assembly 1 .

[0037] Embodiment 3

[0038] like Figure 2 As shown, a high current spring-type probe comprises a needle tube assembly 1, a needle 2, a spring 3 and an elastic constraint 4, which is slidably fitted in the needle tube assembly 1 and electrically contacts the inner wall of the needle tube assembly 1, and the spring 3 is arranged between the needle 2 and the needle tube assembly 1, and the needle 2 compresses the spring 3 during the process of sliding toward the needle tube assembly 1; wherein,

[0039] The elastic restraining member 4 is a crown spring 4b, which is electrically inserted into the needle head 2. The insertion needle 5 is arranged in the needle tube assembly 1. The insertion needle is inserted into the crown spring 4b, elastically restrained by the crown spring 4b, and electrically contacts with the crown spring 4b.

[0040] In this embodiment, the crown spring 4b is generally a turned spring sheet, with large dimensions at the two ends and a small dimension in the middle portion. The middle portion is also gradually narrowed from the two ends to the middle, and a plurality of strip grooves are evenly opened in the middle portion along the circumferential direction.

[0041] Without the crown spring 4b, this spring-type probe can generally only withstand a current of less than 5A. If it exceeds 5A, the temperature will rise by more than 30°C, and it cannot be plugged in and out under power, and it is not resistant to vibration and is prone to instantaneous disconnection. After adding the matching structure of the crown spring 4b and the pin 2, the crown spring 4b constrains the pin 2 to achieve stable electrical contact, increase the contact area between the needle 2 and the needle tube assembly 1, and the assembly is stable and reliable, so that the entire spring-type probe can withstand a relatively large current, which can carry a current of less than 60A, and the ability to resist vibration is enhanced, and it will not be instantly disconnected when subjected to vibration, and the probe will not be damaged even if it is plugged in and out under power.

[0042] In this embodiment, the needle tube assembly 1 includes a needle tube 11 and a connector 12, the pin 5 is arranged on the connector 12, the connector 12 is inserted into the needle tube 11, and the pin 5 is located in the needle tube 11. Of course, the connector 12 may not be arranged, and the pin 5 may be directly integrally formed in the needle tube 11.

[0043] In the case of setting the plug connector 12, there are many ways to connect the plug connector 12 and the needle tube 11, which can be connected by threaded connection or by buckle connection. There are also many structures of the buckle, one of which is listed below: Figure 2 As shown, the outer circumferential wall of the connector 12 is provided with an annular groove 121 extending along its circumference, and the inner circumferential wall of the needle tube 11 is provided with an annular protrusion 111 extending along its circumference. The annular protrusion 111 is embedded in the annular groove 121, and the end of the annular protrusion 111 facing the opening of the needle tube 11 is provided with a conical guide portion 1111 for guiding the connector 12 to be inserted therein.

[0044] It should be noted that in the first and second embodiments, the elastic constraint member 4 uses the claw spring 4a, and in the third embodiment, the elastic constraint member 4 uses the crown spring 4b. The crown spring 4b has a stronger transmission capacity, and the claw spring 4a is slightly weaker, but the claw spring 4a is smaller in size. A suitable elastic constraint member 4 can be selected according to different size environments and transmission requirements. Of course, the elastic constraint member 4 is not limited to the claw spring 4a and the crown spring 4b.

[0045] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A high current spring-type probe, characterized in that: include: Needle tube assembly (1); A needle (2) is slidably mounted in the needle tube assembly (1) and is in electrical contact with the inner wall of the needle tube assembly (1), and is configured not to be allowed to separate from the needle tube assembly (1) in a direction away from the needle tube assembly (1); a spring (3) disposed between the needle (2) and the needle tube assembly (1), wherein the needle (2) compresses the spring (3) when sliding toward the needle tube assembly (1); An elastic restraining member (4), one of the needle head (2) and the needle tube assembly (1) has an insertion pin (5), and the elastic restraining member (4) is electrically installed in the other, elastically restrains the insertion pin (5), and is in electrical contact with the insertion pin (5).

2. The high current spring-loaded probe according to claim 1, characterized in that: The elastic restraining member (4) is a claw spring (4a).

3. The high current spring-loaded probe according to claim 2, characterized in that: The claw spring (4a) is electrically mounted on the inner wall of the needle tube assembly (1), with the large end facing the needle head (2), and the insertion needle (5) is arranged on the needle head (2).

4. The high current spring-loaded probe according to claim 3, characterized in that: The inner peripheral wall of the needle tube assembly (1) is provided with a step surface (101), and the large-mouth end of the claw spring (4a) has a flange (41a), and the surface of the flange (41a) away from the needle head (2) abuts against the step surface (101).

5. The high current spring-loaded probe according to claim 4, characterized in that: One end of the spring (3) abuts against the needle (2), and the other end abuts against the surface of the flange (41a) close to the needle (2).

6. The high current spring-loaded probe according to claim 1, characterized in that: The elastic restraining member (4) is a crown spring (4b).

7. The high current spring-loaded probe according to claim 6, characterized in that: The crown spring (4b) is electrically inserted into the needle head (2), and the insertion needle (5) is arranged in the needle tube assembly (1).

8. The high current spring-loaded probe according to claim 7, characterized in that: The needle tube assembly (1) comprises a needle tube (11) and a plug connector (12), the insertion needle (5) is arranged on the plug connector (12), the plug connector (12) is inserted into the needle tube (11), and the insertion needle (5) is located inside the needle tube (11).

9. The high current spring-loaded probe according to claim 8, characterized in that: The outer peripheral wall of the connector (12) is provided with an annular groove (121) extending along its circumference, and the inner peripheral wall of the needle tube (11) is provided with an annular protrusion (111) extending along its circumference. The annular protrusion (111) is embedded in the annular groove (121), and the end of the annular protrusion (111) facing the opening of the needle tube (11) is provided with a conical guide portion (1111) for guiding the connector (12) to be inserted therein.

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