A plum blossom contact clamping force testing device and testing method thereof

Abstract

The present invention relates to a plum blossom contact clamping force testing device, wherein telescopic clamps are evenly spaced and installed on a shell, and the rear ends of the telescopic clamps are connected to micro cylinders, and the ends of the adjustable screws are connected to the micro cylinders, and the springs on the outside of the plum blossom contacts are in contact with the clamps, and electromagnets are arranged on both sides of the clamps, and the ends of the electromagnet telescopic rods of the electromagnets press the springs, and a pressure sensing sheet is attached to the inner wall of the springs; the pressure sensing sheet is connected to a controller through a wire, and the micro cylinders are connected to the telescopic clamp lifting button and the telescopic clamp replay button through a wire, and the electromagnets are connected to the spring clamping button and the spring release button through a power supply wire. The present invention also relates to a plum blossom contact clamping force testing method. The present invention is scientifically and reasonably designed, and can not only measure the clamping force of the plum blossom contacts, but also has a simple structure, is easy to operate, and does not damage the silver-plated layer on the surface of the plum blossom contacts.

Description

Technical Field

[0001] The invention belongs to the field of power system equipment testing, and in particular relates to a plum blossom contact clamping force testing device and a testing method thereof. Background Art

[0002] Excessive temperature rise is one of the most common problems of switchgear, especially in main transformer incoming line cabinets and busbar cabinets during the peak period of seasonal power consumption. According to the statistics of switchgear failures and defects in previous years, overheating accounts for nearly 20% of serious failures. The temperature rise problem of switchgear is related to the heat source and heat dissipation generated by itself. The main reasons for the large temperature rise of switchgear are abnormal high resistance of current-carrying conductors, eddy current heating of magnetic materials, and loss of insulation materials.

[0003] The parts with excessive temperature rise are mainly concentrated in the plum blossom contacts, busbar static contact parts and cabinets, etc. The main reasons for the excessive temperature rise are the limitations of the current switch cabinet structure, poor quality of parts, non-standard installation technology and poor heat dissipation conditions.

[0004] Improper selection of raw materials during the spring production process, fluctuations in the heat treatment process level, stress relaxation and creep during use will all lead to aging of springs that have been used for a long time. This will reduce the clamping force of the spring on the plum blossom contact, increase the contact resistance, and cause excessive temperature rise.

[0005] The quality of plum blossom contacts plays a decisive role in the safe and reliable operation of switch cabinets. Whether the contact pressure of plum blossom contacts is sufficient is an important indicator of the quality of connectors. The measurement and control of plum blossom contact pressure is an extremely important link to ensure the quality of main circuit connectors. Summary of the invention

[0006] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a plum blossom contact clamping force testing device and a testing method thereof, which can not only measure the plum blossom contact clamping force but also have a simple structure, easy operation, and will not damage the silver-plated layer on the surface of the plum blossom contact.

[0007] The present invention solves the technical problem by the following technical solutions:

[0008] A plum blossom contact clamping force testing device comprises a plum blossom contact, characterized in that: it comprises a shell and a controller, the shell is evenly spaced with a plurality of bolt holes, the plurality of bolt holes are each installed with a telescopic clamp, the rear end of the telescopic clamp is each connected with a micro cylinder, the telescopic clamp comprises an adjustable screw and a clamp, the adjustable screw is arranged in the bolt hole, the end of the adjustable screw is connected with the micro cylinder, the spring on the outer side of the plum blossom contact contacts the clamp, both sides of the clamp are provided with an electromagnet, the end of the electromagnet telescopic rod of the electromagnet presses the spring, the clamp clamps the spring, and a pressure sensing sheet is attached to the inner wall of the spring; the pressure sensing sheet is connected to the controller through a wire, the controller is provided with a display screen, a spring clamping button, a spring releasing button, a telescopic clamp lifting button, a telescopic clamp playback button and a reset button, the micro cylinder is connected to the telescopic clamp lifting button and the telescopic clamp playback button through a wire, and the electromagnet is connected to the spring clamping button and the spring releasing button through a power supply wire.

[0009] Moreover, the spacing angle of the plurality of bolt holes is 15-25°.

[0010] Moreover, a pressing sheet is arranged at the end of the electromagnet telescopic rod of the electromagnet, and a pressing rubber is pasted on the inner side of the pressing sheet.

[0011] Moreover, the number of the pressure sensing sheets is 3 to 5 and they are evenly distributed on the inner wall of the spring.

[0012] A method for testing the clamping force of a plum blossom contact, characterized in that the steps of the method are:

[0013] 1) Nesting the plum blossom contact clamping force testing device on the plum blossom contact;

[0014] 2) Start the retractable clamp playback button to drive the micro cylinder to move, adjust the screw to move forward so that the clamp head of the retractable clamp is close to the spring, start the spring clamping button to drive the electromagnet to energize, the clamping piece at the end of the electromagnet telescopic rod of the electromagnet compresses the spring, and the retractable clamp clamps the spring;

[0015] 3) Start the lifting button of the telescopic clip, and the micro cylinder moves backward to pull the spring outward. When the spring is separated from the plum blossom contact by a certain distance, stick the pressure sensor sheet on the plum blossom contact. The protruding height of the pressure sensor sheet shall not exceed 1mm;

[0016] 4) Activate the retractable clamp playback button (13), the micro cylinder continues to move forward so that the retractable clamp drives the spring forward, and after the spring fits with the plum blossom contact, activate the spring release button to complete the placement of the pressure sensor sheet, and press the reset button to display the value of 0 on the display screen;

[0017] 5) Start the spring clamping button, and the telescopic clamp moves toward the spring and clamps it;

[0018] 6) Start the lifting button of the telescopic clamp, slowly pull the spring outward, and observe the value on the display screen. When the value is fixed at a certain number and does not change, it indicates that the spring has no clamping force on the plum blossom contact at this moment. The number displayed on the display screen is the clamping force of the spring on the plum blossom contact;

[0019] 7) Remove the pressure sensor sheet, press the retractable clamp playback button to reset the spring, press the spring release button, cut off the power to the electromagnet, release the pressure on the spring by the clamping sheet at the end of the electromagnet telescopic rod of the electromagnet, separate the clamp head of the telescopic clamp from the spring, remove the plum blossom contact clamping force test device, and the test is finished.

[0020] The advantages and beneficial effects of the present invention are:

[0021] 1. The plum blossom contact clamping force testing device of the present invention can quickly complete the measurement of the plum blossom contact spring compression force, and the operation is simple and convenient, and there is no damage to the silver-plated layer on the surface of the plum blossom contact, which greatly improves the measurement efficiency.

[0022] 2. The plum blossom contact clamping force testing device of the present invention has a simple structure, is easy to use, and has a low manufacturing cost. It can meet actual needs and has strong practicality.

[0023] 3. In the plum blossom contact clamping force testing device of the present invention, the spacing angle of the plurality of bolt holes is 15-25°, which ensures the installation tightness of the telescopic clamp, ensures the uniform and firm clamping of the spring by the telescopic clamp, and ensures the accurate measurement of the clamping force.

[0024] 4. In the plum blossom contact clamping force testing device of the present invention, a clamping plate is provided at the end of the electromagnet telescopic rod of the chuck electromagnet, and a clamping rubber is attached to the inner side of the clamping plate, so as to increase the contact area between the end of the electromagnet telescopic rod and the spring, ensure the clamping effect of the chuck on the spring, and ensure the accuracy and efficiency of the clamping force test; at the same time, the clamping rubber can play an anti-slip role, increase the friction between the chuck and the spring, reduce the wear on the surface of the spring, and play a protective role.

[0025] 5. The plum blossom contact clamping force testing device of the present invention has 3 to 5 pressure sensing sheets, which are evenly distributed on the inner wall of the spring, and multi-point detection is performed to ensure the precision and accuracy of the spring clamping force measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the present invention;

[0027] Figure 2 It is a structural schematic diagram of the telescopic clamp of the present invention.

[0028] Description of Reference Numerals

[0029] 1-pressure sensor, 2-telescopic clamp, 3-housing, 4-chuck, 5-pressing rubber, 6-adjustable screw, 7-lead, 8-controller, 9-display screen, 10-spring clamping button, 11-spring release button, 12-telescopic clamp lifting button, 13-telescopic clamp playback button, 14-zeroing button, 15-plum blossom contact, 16-spring, 17-pressing plate, 18-electromagnet, 19-electromagnet telescopic rod, 20-micro cylinder. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below through specific examples. The following examples are only illustrative and not restrictive, and the protection scope of the present invention cannot be limited thereto.

[0031] like Figure 1 As shown, the present invention provides a plum blossom contact clamping force testing device, including a plum blossom contact 15, and its innovation lies in: it also includes a shell 3 and a controller 8, the shell 3 is evenly spaced with a plurality of bolt holes, and a telescopic clamp 2 is installed in each of the plurality of bolt holes, and the rear end of the telescopic clamp is connected to a micro cylinder 20, and the bottom end of the micro cylinder is fixed to the shell 3, and the telescopic clamp 2 includes an adjustable screw 6 and a chuck 4, the adjustable screw 6 is arranged in the bolt hole, and the end of the adjustable screw is connected to the micro cylinder, the spring 16 on the outer side of the plum blossom contact 15 is in contact with the chuck 4, and both sides of the chuck are provided with There is an electromagnet 18, the end of the electromagnet telescopic rod 19 of the electromagnet presses the spring, the clamp 4 clamps the spring 16, and a pressure sensor sheet 1 is attached to the inner wall of the spring 16; the pressure sensor sheet is connected to the controller 8 through a wire 7, and the controller 8 is provided with a display screen 9, a spring clamping button 10, a spring release button 11, a telescopic clamp lifting button 12, a telescopic clamp playback button 13 and a reset button 14, the micro cylinder is connected to the telescopic clamp lifting button 12 and the telescopic clamp playback button 13 through a wire, and the electromagnet is connected to the spring clamping button 10 and the spring release button 11 through a power supply wire.

[0032] The spacing angle of several bolt holes is 15~25°, which ensures the installation tightness of the telescopic clamp, ensures that the telescopic clamp clamps the spring evenly and firmly, and ensures the accurate measurement of the clamping force.

[0033] A clamping plate 17 is provided at the end of the electromagnet telescopic rod of the chuck electromagnet, and a clamping rubber 5 is attached to the inner side of the clamping plate to increase the contact area between the end of the electromagnet telescopic rod and the spring, ensure the clamping effect of the chuck on the spring, and ensure the accuracy and efficiency of the clamping force test; at the same time, the clamping rubber can play an anti-slip role, increase the friction between the chuck and the spring, reduce the wear on the spring surface, and play a protective role.

[0034] The number of pressure sensing sheets 1 is 3 to 5 and they are evenly distributed on the inner wall of the spring 16 , and multi-point detection is performed to ensure the precision and accuracy of the spring compression force measurement.

[0035] A method for testing the clamping force of a plum blossom contact, the innovation of which lies in the following steps:

[0036] 1) Nesting the plum blossom contact clamping force testing device on the plum blossom contact 15;

[0037] 2) Start the retractable clamp playback button 13 to drive the micro cylinder to move, adjust the screw rod to move forward so that the clamp head 4 of the retractable clamp is close to the spring 16, start the spring clamping button 10 to drive the electromagnet to energize, and the clamping piece at the end of the electromagnet telescopic rod of the electromagnet compresses the spring, and the retractable clamp clamps the spring 16;

[0038] 3) Start the lifting button 12 of the telescopic clip, and the micro cylinder moves backward to pull the spring 16 outward. When the spring is separated from the plum blossom contact 15 by a certain distance, the pressure sensor sheet 1 is attached to the plum blossom contact. The protruding height of the pressure sensor sheet does not exceed 1mm;

[0039] 4) Start the retractable clamp playback button 13, the micro cylinder continues to move forward so that the retractable clamp drives the spring forward, and after the spring fits with the plum blossom contact, start the spring release button 11 to complete the placement of the pressure sensor sheet 1, and press the reset button 14 so that the display screen 9 displays a value of 0;

[0040] 5) Activate the spring clamping button 10, and the telescopic clamp moves toward the spring 16 and clamps the spring;

[0041] 6) Start the lifting button 12 of the telescopic clamp, slowly pull the spring outward, and observe the value on the display. When the value is fixed to a certain number and does not change, it indicates that the spring has no clamping force on the plum blossom contact at this moment. The number displayed on the display is the clamping force of the spring on the plum blossom contact.

[0042] 7) Remove the pressure sensor sheet, activate the retractable clamp playback button 13 to reset the spring, activate the spring release button 11, cut off the power to the electromagnet, and the clamping sheet at the end of the electromagnet telescopic rod of the electromagnet releases the pressure on the spring. The clamping head of the telescopic clamp is separated from the spring, and the plum blossom contact clamping force test device is removed, and the test is completed.

[0043] The present invention can quickly complete the measurement of the compression force of the plum blossom contact spring, is simple and convenient to operate, does not damage the silver-plated layer on the surface of the plum blossom contact, and greatly improves the measurement efficiency; the invention has a simple structure, is easy to use, and has a low manufacturing cost, can meet actual needs, and has strong practicality.

[0044] Although the embodiments and drawings of the present invention are disclosed for illustrative purposes, those skilled in the art will appreciate that various substitutions, changes and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. A plum blossom contact clamping force testing device, comprising a plum blossom contact, Features: The invention comprises a housing (3) and a controller (8), wherein the housing (3) is provided with a plurality of bolt holes at regular intervals, wherein a telescopic clamp (2) is installed in each of the plurality of bolt holes, wherein the rear end of each of the telescopic clamps is connected to a micro cylinder (20), wherein the telescopic clamp (2) comprises an adjustable screw (6) and a clamp (4), wherein the adjustable screw (6) is arranged in the bolt hole, wherein the end of the adjustable screw is connected to the micro cylinder, wherein a spring (16) on the outer side of the plum blossom contact (15) contacts the clamp (4), wherein electromagnets (18) are arranged on both sides of the clamp, wherein the end of the electromagnet telescopic rod (19) of the electromagnet presses the spring tightly, and wherein the The clamp (4) clamps the spring (16), and a pressure sensing sheet (1) is attached to the inner wall of the spring (16); the pressure sensing sheet is connected to the controller (8) via a wire (7); the controller (8) is provided with a display screen (9), a spring clamping button (10), a spring releasing button (11), a telescopic clamp lifting button (12), a telescopic clamp replay button (13) and a reset button (14); the micro cylinder is connected to the telescopic clamp lifting button (12) and the telescopic clamp replay button (13) via a wire; and the electromagnet is connected to the spring clamping button (10) and the spring releasing button (11) via a power supply wire.

2. The plum blossom contact clamping force testing device according to claim 1, Features: The spacing angle of the plurality of bolt holes is 15-25°.

3. The plum blossom contact clamping force testing device according to claim 1, Features: A clamping sheet (17) is provided at the end of the electromagnet telescopic rod of the electromagnet, and a clamping rubber (5) is attached to the inner side of the clamping sheet.

4. The plum blossom contact clamping force testing device according to claim 1, Features: The number of the pressure sensing sheets (1) is 3 to 5, and they are evenly distributed on the inner wall of the spring (16).

5. A method for testing the clamping force of a plum blossom contact using the plum blossom contact clamping force testing device as claimed in claim 3, Features: The steps of the method are: 1) embedding the plum blossom contact clamping force testing device on the plum blossom contact (15); 2) Activate the retractable clamp playback button (13) to drive the micro cylinder to move, adjust the screw rod to move forward so that the clamp head (4) of the retractable clamp is close to the spring (16), activate the spring clamping button (10) to drive the electromagnet to energize, and the clamping piece at the end of the electromagnet telescopic rod of the electromagnet compresses the spring, and the retractable clamp clamps the spring (16); 3) Activate the lifting button (12) of the telescopic clip, and the micro cylinder moves backward to pull the spring (16) outward. When the spring and the plum blossom contact (15) are separated by a certain distance, the pressure sensor sheet (1) is attached to the plum blossom contact. The protruding height of the pressure sensor sheet does not exceed 1 mm. 4) Activate the retractable clamp playback button (13), the micro cylinder continues to move forward so that the retractable clamp drives the spring forward, and after the spring fits with the plum blossom contact, activate the spring release button (11) to complete the placement of the pressure sensor (1), and press the reset button (14) so ​​that the display screen (9) displays a value of 0; 5) Activate the spring clamping button (10), and the telescopic clamp moves toward the spring (16) and clamps the spring; 6) Activate the lifting button (12) of the telescopic clamp, slowly pull the spring outward, and observe the value on the display. When the value is fixed at a certain number and does not change, it indicates that the spring has no clamping force on the plum blossom contact at this moment. The number displayed on the display is the clamping force of the spring on the plum blossom contact. 7) Remove the pressure sensor sheet, activate the retractable clamp replay button (13) to reset the spring, activate the spring release button (11), cut off the power to the electromagnet, release the pressure on the spring by the clamping piece at the end of the electromagnet telescopic rod of the electromagnet, separate the clamp head of the telescopic clamp from the spring, remove the plum blossom contact clamping force test device, and the test is completed.

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