CN219737603U - Spring probe with low resistance and high reliability - Google Patents

Abstract

The utility model discloses a low-resistance high-reliability spring probe which comprises a needle head, a spring and a needle tube, wherein one end of the needle head is inserted into the needle tube, the spring is arranged in the needle tube, one end of the needle head inserted into the needle tube is provided with a petal structure, a plunger is inserted into the petal structure, a first gap is reserved between the plunger and the needle head, the other end of the plunger is in butt joint or plug joint with the spring, and the outer wall of the petal structure is in interference fit with the inner wall of the needle tube. The needle head is made into the shape of a petal structure, the petal structure of the needle head is in interference fit with the inner wall of the needle tube, the needle head can be completely attached to the inner wall of the needle tube, the contact is stable, the deflection amplitude of the needle head is small, and the positioning is accurate.

Description

Spring probe with low resistance and high reliability

Technical Field

The utility model relates to a spring probe with low resistance and high reliability.

Background

As shown in fig. 1-2, the spring probe generally comprises a needle 1', a cannula 3', and a spring 2'. The spring 2' is arranged in the needle tube, and the needle shaft is inserted in the needle tube. When the needle 1' is extruded by the components, the spring 2' is compressed, the needle 1' can axially move along the needle tube under the action of the pushing force of the spring 2', the outer surface of the needle 1' is contacted with the inner surface of the needle tube 3', and an electric signal is transmitted from the needle shaft to the needle tube 3'. The fault components or assemblies can be detected rapidly, and defects and defect classification can be positioned accurately, so that the stability and the size of the resistance of the probe are required to be high.

When the needle 1' is extruded by components, the needle 1' can be compressed to a certain height, so that the spring 2' is compressed, a component force deviating from the axial direction of the needle 1' exists on the thrust generated by the spring 2' on the needle 1', the outer surface of the needle 1' is contacted with the inner surface of the needle tube 3', an electric signal is transmitted from the needle 1' to the needle tube 3' and then is transmitted from the needle tail to act as a carrier, and after the transmission is finished, the needle 1' can rebound to an initial position under the action of the elastic force. This process may cause the resistance to jump due to vibration or the like caused by the use environment. The advantages are that: the structure slides smoothly, and the surface abrasion is slight in the working process, and the service life is long. The defects are that: because of the clearance between the parts, the contact is unstable in the working process, and the resistance value can intermittently jump.

Disclosure of Invention

In order to overcome the defect, the utility model aims to provide the low-resistance high-reliability spring probe which is quite stable in contact, small in deflection amplitude of the needle head, accurate in positioning and suitable for testing occasions with high requirements on resistance stability.

In order to achieve the above purpose, the utility model adopts the following technical scheme: the utility model provides a high reliability spring probe of low resistance, includes syringe needle, spring, needle tubing, the needle is inserted to the one end of syringe needle, the spring sets up in the needle tubing, inserts the one end of the syringe needle of needle tubing is provided with the petal structure, the inside plunger that inserts of petal structure, leave the clearance between plunger and the needle, the other end and the spring butt or the grafting of plunger, the outer wall of petal structure and the inner wall interference fit of needle tubing.

Preferably, the petal structure comprises a plurality of petals, and a second gap is reserved between every two adjacent petals. The second clearance can guarantee petal structure shrink.

Preferably, the periphery of the free end of each flap is integrally formed with a protrusion. When the needle is inserted into one end of the needle tube during installation, the inner wall of the needle tube firstly presses the bulge of the valve body, so that the valve bodies shrink inwards to clamp the plunger.

Preferably, the peripheral dimension of the petal structure is greater than the diameter of the needle shaft of the needle.

Preferably, each petal body is provided with a groove in an integrated mode, one end, close to the petal structure, of each plunger is provided with a step structure matched with the groove in shape, and the plungers are inserted into the petal structure through the matched grooves and the step structures. The cooperation setting of recess and step structure does benefit to the plunger to insert and establishes in the petal structure.

Preferably, each petal body is provided with a groove in an integrated mode, one end, close to the petal structure, of each plunger is provided with a step structure matched with the groove in shape, and the plungers are inserted into the petal structure through the matched grooves and the step structures.

Preferably, the other end of the plunger is in a columnar structure with a diameter smaller than that of the plunger, and the spring is inserted.

Preferably, the inner and outer diameters of the end of the spring near the plunger are smaller than the inner and outer diameters of the body of the spring, respectively. The plunger can be better attached, so that the plunger does not shake after being inserted into the spring.

Preferably, the other end of the plunger is spherical and abuts against the spring.

The low-resistance high-reliability spring probe has the beneficial effects that the needle is made into the shape of a petal structure, the petal structure of the needle is in interference fit with the inner wall of the needle tube, and can be completely attached to the inner wall of the needle tube, when the needle is assembled in, the petal structure of the needle can be stressed to shrink inwards, so that the phenomenon that the needle cannot slide smoothly due to too large interference, a plunger is added in the middle of the needle, a first gap is reserved between the plunger and the needle, the petal structure of the needle can shrink normally, and the action of the plunger is to enable the elastic force of the spring to be well transmitted to the needle, and the phenomenon that the spring is blocked and does not rebound is avoided. Compared with the conventional spring probe, the novel probe is quite stable in contact, no gap exists between the needle head and the needle tube, the deflection amplitude of the needle head is small, the positioning is precise, and the novel spring probe is suitable for testing occasions with high requirements on resistance stability. The problem that the amplitude of resistance value jump is large due to vibration, deflection and the like of a common spring probe during working is solved.

Drawings

FIG. 1 is a front view of a spring probe of the prior art;

FIG. 2 is a cross-sectional view of A-A of FIG. 1;

FIG. 3 is a front view of a low resistance high reliability spring probe according to an embodiment;

FIG. 4 is a cross-sectional view of B-B in FIG. 3;

FIG. 5 is a front view of a tip of a low resistance high reliability spring probe according to an embodiment;

FIG. 6 is a cross-sectional view of C-C of FIG. 5;

FIG. 7 is a perspective view of a tip of a low resistance high reliability spring probe according to one embodiment;

fig. 8 is a front view of a plunger in a low-resistance high-reliability spring probe according to an embodiment.

Detailed Description

The preferred embodiments of the present utility model will be described in detail below with reference to the accompanying drawings so that the advantages and features of the present utility model can be more easily understood by those skilled in the art, thereby making clear and defining the scope of the present utility model.

In a first embodiment of the present utility model,

referring to fig. 3-8, this embodiment discloses a low resistance high reliability spring probe, including syringe needle 1, spring 2, needle tubing 3, the needle tubing 3 is inserted to the one end of syringe needle 1, spring 2 sets up in needle tubing 3, the one end of syringe needle 1 of inserting needle tubing 3 is provided with petal structure 4, as shown in fig. 5-7, the peripheral size of petal structure 4 is greater than the needle shaft diameter of syringe needle 1, the inside plunger 5 that inserts of petal structure 4, leave first clearance between plunger 5 and the needle tubing 1, plunger 5 and spring 2 grafting, the outer wall of petal structure 4 and the inner wall interference fit of needle tubing 3.

As shown in fig. 7, the petal structure 4 includes four petals 4a, or may be configured into three or two petals, and a second gap 4d is left between every two adjacent petals 4a, so as to provide conditions for contraction of the petal structure 4, and a protrusion 4b is integrally formed at the periphery of the free end of each petal 4 a.

The petal structure 4 of syringe needle 1 is interference fit with the inner wall of needle tubing 3, can laminate completely with the inner wall, when assembling into, petal structure 4 atress can inwards shrink, is unlikely to the syringe needle because the interference is too big and can't smooth and easy slip, adds plunger 5 in the centre, is had first clearance between plunger 5 and the syringe needle 1, makes the petal structure 4 of syringe needle 1 can normally shrink, and plunger 5's effect is that the elasticity that makes spring 2 can be fine on the transmission to syringe needle 1, avoids appearing spring 2 card dead phenomenon that does not kick-back.

In order to enable the plunger 5 to be better inserted into the petal structure 4, as shown in fig. 6, a groove 4c is integrally formed in each petal body 4a, one end, close to the petal structure 4, of the plunger 5 is provided with a step structure 5a matched with the groove 4c in shape, and the plunger 5 is inserted into the petal structure 4 through the matched groove 4c and the step structure 5 a.

In order to facilitate the plug-in connection of the plunger 5 and the spring 2, the other end of the plunger 5 is of a columnar structure with the diameter smaller than that of the plunger 5 and is inserted into the spring 2.

As shown in fig. 4, the inner and outer diameters of the end of the spring 2 near the plunger 5 are smaller than the inner and outer diameters of the body of the spring 2, respectively.

In a second embodiment of the present utility model,

unlike the first embodiment, the plunger 5 of the present embodiment is not inserted into the spring 2, but the plunger 5 is disposed so as to abut against the spring 2, and the other end of the plunger 5 in the present embodiment is spherical and abuts against the end of the spring 2.

The above embodiments are only for illustrating the technical concept and features of the present utility model, and are intended to enable those skilled in the art to understand the content of the present utility model and to implement the same, but are not intended to limit the scope of the present utility model, and all equivalent changes or modifications made according to the spirit of the present utility model should be included in the scope of the present utility model.

Claims (8)

1. The utility model provides a high reliability spring probe of low resistance, includes syringe needle (1), spring (2), needle tubing (3) are inserted to one end of syringe needle (1), spring (2) set up in needle tubing (3), its characterized in that: the needle is characterized in that one end of the needle head (1) inserted into the needle tube (3) is provided with a petal structure (4), a plunger (5) is inserted into the petal structure (4), a first gap is reserved between the plunger (5) and the needle head (1), the other end of the plunger (5) is abutted to or inserted into the spring (2), and the outer wall of the petal structure (4) is in interference fit with the inner wall of the needle tube (3).

2. The low resistance high reliability spring probe of claim 1, wherein: the petal structure (4) comprises a plurality of petals (4 a), and a second gap (4 d) is reserved between every two adjacent petals (4 a).

3. The low resistance high reliability spring probe of claim 2, wherein: the periphery of the free end of each flap body (4 a) is integrally formed with a bulge (4 b).

4. The low resistance high reliability spring probe of claim 1, wherein: the peripheral size of the petal structure (4) is larger than the diameter of the needle shaft of the needle head (1).

5. The low resistance high reliability spring probe of claim 2, wherein: every the inside integrated into one piece of lamella body (4 a) has recess (4 c), one end that plunger (5) are close to petal structure (4) is provided with step structure (5 a) with recess (4 c) shape fit, plunger (5) are inserted through complex recess (4 c) and step structure (5 a) and are established in petal structure (4).

6. The low resistance high reliability spring probe of claim 5, wherein: the other end of the plunger (5) is of a columnar structure with the diameter smaller than that of the plunger (5), and the spring (2) is inserted into the plunger.

7. The low resistance high reliability spring probe of claim 6, wherein: the inner diameter and the outer diameter of one end of the spring (2) close to the plunger (5) are respectively smaller than the inner diameter and the outer diameter of the body of the spring (2).

8. The low resistance high reliability spring probe of claim 1, wherein: the other end of the plunger (5) is spherical and is propped against the spring (2).