Contact finger capable of improving accuracy of loop resistance test
By designing a contact finger including a circular piece, a curved piece and a waist-shaped contact, the problems of small contact area and short service life in traditional crocodile clips in loop resistance test are solved, and the effect of improving the accuracy of loop resistance test is achieved.
Patent Information
- Application Number
- CN202421741064.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-19
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-07-19
AI Technical Summary
When traditional crocodile clips perform loop resistance testing, the small contact area leads to a large measurement, and when a large current is used, it will cause heating and annealing, affecting the service life of the contact.
Design a contact finger, including circular plate, arc-shaped plate and waist-shaped contact, improves the accuracy of loop resistance test by increasing the contact area and reducing the impact on the spring.
By increasing the contact area with the steel sheet, the resistivity of the device is reduced and the accuracy of loop resistance testing is improved. After using the device, the loop resistance can be reduced by 15%, increasing the accuracy of about 15%.
Smart Images
Figure CN223037987U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of electric power equipment, in particular to a touch finger for improving the accuracy of loop resistance testing. Background Art
[0002] When conducting a loop resistance test, especially when testing the loop resistance of the opponent vehicle circuit breaker, the traditional method is to clamp the plum blossom contact with an alligator clip. Due to the small contact area, it is impossible to contact the contact steel sheet with a large area, which will cause the measured loop resistance value to be too large. At the same time, the traditional alligator clip will clamp the contact spring, which will generate heat and annealing when a large current is passed, thus affecting the service life of the contact.
[0003] In view of the above situation, the present application intends to design a contact finger which can increase the contact area and reduce the influence on the spring. Utility Model Content
[0004] The utility model aims to provide a contact finger which can increase the area of the contact head, reduce the influence on the spring and improve the accuracy of loop resistance testing.
[0005] The above technical purpose of the utility model is achieved through the following technical scheme: a touch finger for improving the accuracy of loop resistance testing, including a circular piece, a plurality of arc-shaped contact pieces are arranged on one side of the circular piece, a plurality of waist-shaped contacts are arranged on the other side of the circular piece, and a handle jack is arranged in the center of the circular piece.
[0006] It is further configured as follows: the number of the arc-shaped contact pieces is four, and the four arc-shaped contact pieces are evenly arranged around the center of the circular piece.
[0007] It is further configured that: an inwardly curved slope is provided on the outer side of the end of the curved contact piece.
[0008] It is further configured that: the waist-shaped contact is composed of two symmetrical pieces.
[0009] It is further configured as follows: two symmetrical waist-shaped hollows are arranged on the circular piece.
[0010] It is further configured that: a silver-plated layer is arranged outside the contact finger.
[0011] It is further configured as follows: two nostril holes are symmetrically arranged on the circular sheet.
[0012] In summary, the utility model has the following beneficial effects: 1. The new device increases the contact area with the steel sheet, and the original alligator clip is improved into a finger-type, and the original contact with 2 steel sheets is upgraded to contact with 24 steel sheets. The contact area is increased, the resistivity of the device is reduced, and the accuracy of the loop resistance test is improved. 2. After on-site power-on measurement, the loop resistance can be reduced by 15% after using the device, and the accuracy is increased by about 15%. Description of the Drawings
[0013] Figure 1 It is a schematic structural diagram of one side of the finger contact;
[0014] Figure 2 It is a schematic structural diagram of the other side of the finger contact.
[0015] In the figure: 1, circular piece; 2, arc-shaped contact piece; 3, kidney-shaped contact head; 4, handle jack; 5, arc-shaped slope; 6, kidney-shaped hollow; 7, silver plating layer; 8, through nose hole. Detailed Description of the Preferred Embodiment
[0016] The following further describes the present utility model in detail with reference to the accompanying drawings.
[0017] A finger contact for improving the test accuracy of loop resistance includes a circular piece 1, and the edge of the circular piece 1 is provided with a rounded corner.
[0018] A handle jack 4 is arranged at the middle position of the circular piece 1 for inserting a handle, so as to facilitate inserting the finger contact into the plum blossom contact head.
[0019] Four arc-shaped contact pieces 2 are arranged on one side of the circular piece 1, and the arc-shaped contact pieces 2 are evenly arranged around the center of the circle of the circular piece 1. An inward arc-shaped slope 5 is arranged on the outer side of the end of the arc-shaped contact piece 2. The arc-shaped slope 5 can play a guiding role to facilitate inserting the finger contact into the plum blossom contact head. The outer diameter of the four arc-shaped contact pieces 2 is preferably 1 mm larger than the inner diameter of the plum blossom contact head to ensure the stable connection between the two.
[0020] Two symmetrical kidney-shaped contact heads 3 are arranged on the other side of the circular piece 1, and the kidney-shaped contact heads 3 also take the handle jack 4 as the center of the circle.
[0021] Two symmetrical kidney-shaped hollows 6 are arranged on the circular piece 1, and the kidney-shaped hollows 6 can reduce the weight and cost.
[0022] In order to improve the conductivity and further reduce the error during the loop resistance test, a 2-micron silver plating layer 7 is arranged outside the finger contact.
[0023] Two symmetrical through nose holes 8 are arranged on the circular piece 1, which can provide another fixing method for the finger contact.
[0024] During use, insert the arc-shaped contact pieces 2 of the finger contact into the plum blossom contact head, and clamp the chuck of the debugging device on the kidney-shaped contact heads 3, so as to realize the test of the loop resistance. Through on-site power-on measurement, after using this finger contact, the loop resistance can be reduced by 15%, and the accuracy is increased by about 15%.
[0025] This specific embodiment is only an interpretation of the present utility model, and it does not limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment that do not contribute creatively as needed, but as long as it is within the scope of the claims of the present utility model, it is protected by the patent law.
Claims
1. A probe finger for improving the accuracy of loop resistance testing, characterized in that: The utility model comprises a circular piece, one side of which is provided with a plurality of arc-shaped contact pieces, the other side of which is provided with a plurality of waist-shaped contacts, and the center of which is provided with a handle insertion hole.
2. A touch finger for improving loop resistance test accuracy according to claim 1, characterized in that: There are four arc-shaped contact pieces, and the four arc-shaped contact pieces are evenly arranged at the center of the circular piece.
3. The touch finger for improving the accuracy of loop resistance testing according to claim 2, characterized in that: An inwardly curved slope is arranged on the outer side of the end of the curved contact piece.
4. The touch finger for improving the accuracy of loop resistance testing according to claim 1, characterized in that: The waist-shaped contact consists of two symmetrical pieces.
5. The touch finger for improving the accuracy of loop resistance testing according to claim 1, characterized in that: Two symmetrical waist-shaped hollows are arranged on the circular piece.
6. The touch finger for improving the accuracy of loop resistance testing according to claim 1, characterized in that: A silver-plated layer is arranged outside the contact finger.
7. The touch finger for improving loop resistance test accuracy according to claim 1, characterized in that: Two nostril holes are symmetrically arranged on the circular sheet.