Elastic sheet contact type large-current test probe

Abstract

The invention discloses an elastic sheet contact type large-current test probe which comprises a tube body, an upper probe body is arranged at one end of the tube body, a lower probe body is arranged at the other end, away from the upper probe body, of the tube body, the tube body, the upper probe body and the lower probe body form partial wrapping, and the lower probe body can move along the inner wall of the tube body in the tube body. A spring is arranged between the upper needle body and the lower needle body, a positioning piece extends from one end, close to the upper needle body, of the lower needle body, a clamping part extends from one end, close to the lower needle body, of the upper needle body, and when the spring is compressed, the clamping part is opened towards the tube body and keeps elastic clamping contact with the positioning piece. According to the invention, the positioning piece and the clamping part which are opposite to each other are arranged in the tube body, so that the spring is compressed when the spring is in a test state. The clamping part can elastically clamp the positioning piece after being opened, so that the upper probe body and the lower probe body are in stable contact, and therefore, in a large-current transmission test, the resistance is constant without attenuation, and the current stability is far better than that of a traditional probe.

Description

Technical Field

[0001] This invention relates to the field of test probes, and more specifically to a spring contact type high current test probe. Background Technology

[0002] Existing test probes typically have needles at both ends of a tube, with springs inside the tube to connect the needles. When performing high-current tests, current probes usually have a hollow structure at one end of one of the needles. This allows the two needles to form a socketed contact when they approach each other in the test environment, ensuring resistance stability during high-current testing. However, with increasing test cycles, the inner wall of the needle gradually thins due to friction from the socketed structure, leading to unstable socketed contact and consequently, resistance decay and compromised current stability. Summary of the Invention

[0003] To address the aforementioned problems, this invention provides a spring-loaded contact type high-current test probe, comprising a tube body. An upper needle body is fixedly connected to one end of the tube body and is used to contact the product under test. A lower needle body is located at the other end of the tube body away from the upper needle body and is used to connect to a circuit board. The tube body partially encloses the upper and lower needle bodies, and the lower needle body can move along the inner wall of the tube body. A spring is provided between the upper and lower needle bodies. A positioning element extends along the tube body towards the upper needle body at the end of the lower needle body near the upper needle body. A clamping portion extends along the tube body towards the lower needle body at the end of the upper needle body near the lower needle body. When the spring is compressed, the clamping portion opens towards the tube body and maintains an elastic clamping contact with the positioning element.

[0004] Furthermore, the positioning element is a column protruding along the lower needle body towards the upper needle body, one end of the spring is sleeved on the side wall of the positioning element, and the positioning element is inserted into the spring.

[0005] Furthermore, a second limiting ring protrudes outward on the outer wall of the lower needle body, and the end of the tube body near the lower needle body bends inward to form a curved portion.

[0006] Furthermore, the upper needle body is a hollow cylinder, including a contact part and a wrapping part. The wrapping part contacts the inner wall of the tube body. The contact part and the clamping part are respectively disposed at both ends of the wrapping part. The clamping part includes a plurality of spring pieces arranged in a ring facing the lower needle body. The spring pieces are elastically connected to the wrapping part.

[0007] Furthermore, a protrusion is provided on the side of the spring piece away from the wrapping part, and when the spring is compressed, the protrusion maintains an elastic clamping contact with the positioning member.

[0008] Furthermore, an annular limiting groove is provided on the outer wall of the wrapping part, and several protrusions that can cooperate with the limiting groove are raised on the inner wall of the tube. When the wrapping part is in contact with the inner wall of the tube, the protrusions are embedded in the limiting groove.

[0009] Furthermore, the number of protrusions is four, and they are spaced 90 degrees apart.

[0010] Furthermore, the contact portion is provided with several tapered portions.

[0011] Compared with the prior art, the beneficial effects of the present invention are: This application provides a positioning element and a clamping part facing opposite directions inside the tube. In the test state, when the spring is compressed and the upper and lower needle bodies are in contact with each other, the clamping part can elastically clamp the positioning element after opening, so that the upper and lower needle bodies are in stable contact. Thus, in the high current transmission test, the resistance is constant and there is no attenuation, and the current stability is far superior to that of traditional probes.

[0012] Additional aspects and advantages of the invention will be set forth in the description which follows, and in some respects will be obvious from the description or may be learned by practice of the invention. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a structural assembly diagram of the tube body and the lower needle body of the present invention; Figure 3 This is a schematic diagram of the upper needle body of the present invention; Figure 4 This is a cross-sectional view of the overall structure of the present invention.

[0015] The reference numerals and names in the figure are as follows: Tube body 100, upper needle body 200, lower needle body 300, spring 400, positioning member 310, clamping part 240, second limiting ring 320, bending part 110, contact part 210, wrapping part 220, spring piece 241, protrusion 241a, limiting groove 221, protrusion 120, tapered part 211. Detailed Implementation

[0016] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] The present invention will now be described in more detail. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention. It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as being "connected to" another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them.

[0018] In the description of this invention, it should be noted that directional terms such as "front," "rear," "up," "down," "left," "right," "horizontal," "vertical," "horizontal," and "top," "bottom," etc., indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. These terms are used solely for the convenience of describing the invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner or outer contours of each component itself. In the description of this invention, it should be noted that the use of terms such as "first" and "second" to define components is merely for the convenience of distinguishing the corresponding components. Unless otherwise stated, these terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0019] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention.

[0020] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0021] The preferred embodiments of the present invention will now be further described with reference to the accompanying drawings, such as... Figure 1 As shown, a spring-loaded contact type high-current test probe includes a tube body 100. One end of the tube body 100 has an upper needle body 200 for contacting the product under test. The other end of the tube body 100, away from the upper needle body 200, has a lower needle body 300 for connecting to a circuit board. The tube body 100 partially encloses the upper needle body 200 and the lower needle body 300, and the lower needle body 300 can extend along the inner edge of the tube body 100. The wall moves, and a spring 400 is provided between the upper needle body 200 and the lower needle body 300. A positioning member 310 extends along the tube body 100 toward the upper needle body 200 at one end of the lower needle body 300 near the upper needle body 200. A clamping part 240 extends along the tube body 100 toward the lower needle body 300 at one end of the upper needle body 200 near the lower needle body 300. When the spring 400 is compressed, the clamping part 240 opens toward the tube body 100 and maintains an elastic clamping contact with the positioning member 310.

[0022] When testing is required, the upper needle body 200 contacts the product under test, and the lower needle body 300 is connected to the circuit board. When the upper needle body 200 contacts the product under test, since the upper needle body 200 is fixedly connected to the tube body 100, the upper needle body 200 moves toward the lower needle body 300, and one end of the spring 400 inside the tube body 100 is compressed. When the upper needle body 200 moves to a suitable position, the clamping part 240 contacts the positioning member 310 of the lower needle body 300. When the upper needle body 200 continues to move toward the lower needle body 300, the spring 400 inside the tube body 100 is further compressed, the clamping part 240 opens toward the tube body 100, the positioning member 310 is inserted into the clamping part 240, and the clamping part 240 opens toward the tube body 100 and maintains an elastic clamping contact with the positioning member 310.

[0023] Compared with the prior art, this application provides a positioning member 310 and a clamping part 240 facing each other inside the tube body 100. In the test state, when the spring 400 is compressed and the upper needle body 200 and the lower needle body 300 are in contact with each other, the clamping part 240 can open up and form an elastic clamping on the positioning member 310, so that the upper needle body 200 and the lower needle body 300 are in stable contact. Thus, in the high current transmission test with a current of up to 40A-60A, the resistance is constant and there is no attenuation. The current stability is far superior to that of traditional probes.

[0024] Furthermore, based on the above embodiments, such as Figure 2As shown, the positioning member 310 is a column protruding from the lower needle body 300 toward the upper needle body 200. One end of the spring 400 is sleeved on the side wall of the positioning member 310, and the positioning member 310 is inserted into the spring 400. In this way, when the spring 400 is compressed and shifts, the side wall will limit the shift of the spring 400 because the spring 400 is sleeved on the side wall, thereby ensuring the stability of the contact between the spring 400 and the second pillow.

[0025] Furthermore, based on the above embodiments, such as Figure 2 As shown, a second limiting ring 320 protrudes outward on the outer wall of the lower needle body 300. The end of the tube 100 near the lower needle body 300 is bent inward to form a bent portion 110. When the spring 400 is compressed, the bent portion 110 can block one side of the second limiting ring 320, thereby preventing the lower needle body 300 from coming out of the tube 100.

[0026] Furthermore, based on the above embodiments, such as Figure 3 As shown, the upper needle body 200 is a hollow cylinder, including a contact portion 210 and a wrapping portion 220. The wrapping portion 220 contacts the inner wall of the tube body 100. The contact portion 210 and the clamping portion 240 are respectively disposed at both ends of the wrapping portion 220. The clamping portion 240 includes a plurality of spring pieces 241 arranged in a ring facing the lower needle body 300. The spring pieces 241 are elastically connected to the wrapping portion 220. When the clamping portion 240 is in contact with the positioning member 310 of the lower needle body 300, as the upper needle body 200 continues to move toward the lower needle body 300, the positioning member 310 pushes the spring pieces 241 toward the tube body 100 and inserts them into the upper needle body 200. Since the spring pieces 241 are elastically connected to the wrapping portion 220, the spring pieces 241 can form an elastic clamping contact with the side wall of the clamping portion 240.

[0027] Furthermore, based on the above embodiments, such as Figure 3 As shown, a protrusion 241a is provided on the side of the spring piece 241 away from the wrapping part 220. When the spring 400 is compressed, the protrusion 241a maintains elastic clamping contact with the positioning member 310, which can have a better clamping effect compared with the spring piece 241 directly contacting the positioning member 310.

[0028] Furthermore, based on the above embodiments, such as Figure 3 and Figure 4As shown, an annular limiting groove 221 is provided on the outer wall of the wrapping part 220, and several protrusions 120 protrude on the inner wall of the tube body 100, which can cooperate with the limiting groove 221. When the wrapping part 220 is wrapped by the tube body 100, the protrusions 120 are embedded in the limiting groove 221, thereby further improving the stability of the connection between the upper needle body 200 and the tube body 100.

[0029] Furthermore, based on the above embodiments, such as Figure 3 and Figure 4 As shown, there are four protrusions 120 spaced at 90-degree intervals, which makes the connection between the upper needle body 200 and the tube body 100 more stable.

[0030] Furthermore, based on the above embodiments, such as Figure 3 and Figure 4 As shown, the contact portion 210 is provided with a plurality of tapered portions 211, which allow the contact portion 210 to make more precise contact with the contact points of the product under test.

[0031] The details of the exemplary embodiments described above are provided, and the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the invention.

Claims

1. A spring-loaded contact type high-current test probe, characterized in that, The device includes a tube body (100), one end of which is provided with an upper needle body (200) for contacting the product being tested. The other end of the tube body (100), away from the upper needle body (200), is provided with a lower needle body (300) for connecting to a circuit board. The tube body (100) partially encloses the upper needle body (200) and the lower needle body (300), respectively, and the lower needle body (300) can move along the inner wall of the tube body (100) within the tube body (100). A spring (400) is provided between the body (200) and the lower needle body (300). A positioning member (310) extends along the tube (100) toward the upper needle body (200) at one end of the lower needle body (300) near the upper needle body (200). A clamping part (240) extends along the tube (100) toward the lower needle body (300) at one end of the upper needle body (200) near the lower needle body (300). When the spring (400) is compressed, the clamping part (240) opens toward the tube (100) and maintains an elastic clamping contact with the positioning member (310).

2. The spring-loaded contact type high-current test probe according to claim 1, characterized in that, The positioning element (310) is a column protruding along the lower needle body (300) toward the upper needle body (200). One end of the spring (400) is sleeved on the side wall of the positioning element (310), and the positioning element (310) is inserted into the spring (400).

3. The spring-loaded contact type high-current test probe according to claim 2, characterized in that, A second limiting ring (320) protrudes outward on the outer wall of the lower needle body (300), and a curved part (110) is formed by bending one end of the tube body (100) near the lower needle body (300) towards the inside of the tube body (100).

4. The spring-loaded contact type high-current test probe according to claim 1, characterized in that, The upper needle body (200) is a hollow cylinder, including a contact part (210) and a wrapping part (220). The wrapping part (220) is in contact with the inner wall of the tube body (100). The contact part (210) and the clamping part (240) are respectively disposed at both ends of the wrapping part (220). The clamping part (240) includes a plurality of spring pieces (241) arranged in a ring facing the lower needle body (300). The spring pieces (241) are elastically connected to the wrapping part (220).

5. The spring-loaded contact type high-current test probe according to claim 4, characterized in that, A protrusion (241a) is provided on the side of the spring piece (241) away from the wrapping part (220). When the spring (400) is compressed, the protrusion (241a) maintains an elastic clamping contact with the positioning member (310).

6. The spring-loaded contact type high-current test probe according to claim 5, characterized in that, An annular limiting groove (221) is provided on the outer wall of the wrapping part (220), and a number of protrusions (120) that can cooperate with the limiting groove (221) are raised on the inner wall of the tube body (100). When the wrapping part (220) is contacted by the inner wall of the tube body (100), the protrusions (120) are embedded in the limiting groove (221).

7. The spring-loaded contact type high-current test probe according to claim 6, characterized in that, The number of protrusions (120) is 4, and they are spaced 90 degrees apart.

8. The spring-loaded contact type high-current test probe according to claim 7, characterized in that, The contact portion (210) is provided with a plurality of tapered portions (211).

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