Device for testing softening breakdown resistance of enameled wire

Abstract

The utility model relates to the technical field of enameled wire performance testing, and aims to solve the technical problems of low testing efficiency and poor testing accuracy. In order to solve the technical problem, the utility model provides the device for the softening breakdown resistance test of the enameled wire. According to the utility model, a cavity is arranged in a box body; the power supply is arranged at the bottom of the box; the heating mechanism is arranged at the bottom of the box body; the temperature sensor is arranged in the cavity; the mounting bracket comprises a vertically arranged main body and a plurality of fan blades which are arranged on the outer wall of the main body at intervals in the circumferential direction; the fan blades are provided with test columns, the test columns are divided into two long test columns and a short test column, the short test column is lower than the two long test columns, and one of the two long test columns, the short test column and the power supply form a loop; the balancing weight is used for providing a load for the to-be-tested enameled wire. The testing device ensures the testing accuracy and is high in testing efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of enameled wire performance testing, in particular to a device for enameled wire softening resistance breakdown testing. Background Art

[0002] In order to confirm the softening and breakdown resistance of the insulating enameled wire film, it is necessary to conduct a softening and breakdown test on it. The current detection method used in the industry is the cross-cross constant temperature method, and most of the related test instruments or devices are designed and developed based on this principle, but it has the following problems: 1. Only a single sample wire can be tested each time, and the test efficiency is low; 2. The test accuracy is poor, etc. Utility Model Content

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the above-mentioned problems existing in the prior art.

[0004] In order to solve the above technical problems, the utility model provides a device for testing the softening resistance of enameled wire, comprising:

[0005] A box body having a cavity therein;

[0006] A power supply is arranged at the bottom of the box;

[0007] A heating mechanism is arranged at the bottom of the box;

[0008] A temperature sensor is disposed in the cavity;

[0009] The mounting bracket comprises a main body arranged vertically and a plurality of fan blades arranged on the outer wall of the main body at intervals along the circumferential direction; the fan blades are provided with three test columns arranged in a triangle, the test columns are divided into two long test columns and one short test column, the short test column is arranged lower than the two long test columns, and one of the two long test columns and the short test column form a loop with a power supply;

[0010] The counterweight block is used to provide load for the enameled wire to be tested;

[0011] The loading platform can be raised and lowered and is located directly below the mounting bracket; when the sample is under the preheating state, the loading platform is configured to rise to support the counterweight block; when the sample is under the testing state, the loading platform is separated from the counterweight block.

[0012] In one embodiment of the utility model, an inner wall of the bottom of the cavity is provided with an annular base which is protruded upward, and the loading platform is lifted up and down in the annular base.

[0013] In one embodiment of the utility model, a plurality of sockets connected to the power supply are circumferentially provided on the annular base; a plug is provided at the bottom of the fan, the plug is connected to the socket, and the plug is connected to one of the two long test columns and the short test column.

[0014] In one embodiment of the utility model, the present application also includes a driving mechanism for driving the loading platform to move up and down, and the driving mechanism is arranged at the bottom of the box; the driving mechanism includes a motor, a lead screw and a lead screw nut; the output end of the motor is coaxially connected to the lead screw, the lead screw is vertically arranged and threadedly connected to the lead screw nut, the lead screw nut is connected to the loading platform, and the motor drives the lead screw nut and the loading platform to move up and down synchronously when working.

[0015] In one embodiment of the utility model, the driving mechanism further includes a vertically arranged guide rail and a slider matched with the guide rail, the guide rail is vertically arranged on the inner wall of the cavity, and the slider is connected to the loading platform.

[0016] In one embodiment of the present invention, the counterweight has a variety of weight specifications.

[0017] In one embodiment of the present invention, the length of the short test column is shorter than the length of the long test column.

[0018] In one embodiment of the utility model, a through hole is provided in the main body, and the lead screw is located in the through hole.

[0019] In one embodiment of the utility model, the test column includes an insulating test column body, a conductive terminal and a locking piece; one end of the test column body is connected to the fan sheet, the conductive terminal is connected to the other end of the test column body, and the conductive terminal is conductive to the power supply; the locking piece is connected to the conductive terminal.

[0020] In one embodiment of the present invention, the box body includes a cabinet body and a cover, and the cover is openably connected to the top of the cabinet body.

[0021] In one embodiment of the present invention, a handle is provided on the front side of the cover.

[0022] The above technical solution of the utility model has the following advantages compared with the prior art:

[0023] The device for softening breakdown test of enameled wire described in the utility model, when testing by this embodiment, the two ends of the first enameled wire to be tested are respectively connected to two long test columns, one end of the second enameled wire to be tested is connected to the short test column, and the other end is naturally hung down after passing the first enameled wire to be tested and a counterweight block of a specified weight is hung, thereby forming a ring-shaped cross mode, which can meet the test of enameled wires of different specifications, especially the test of enameled wires of specifications below 0.10mm, and has a wide range of applications. And the self-load is applied by hanging the counterweight block at the end of the enameled wire to be tested, which effectively solves the load application deviation caused by the cross-cross method and ensures the test accuracy. In addition, this embodiment can test multiple groups of enameled wires to be tested at one time, and the test efficiency is high. In this embodiment, since the test column on each fan sheet forms an independent test circuit with the power supply, multiple groups of enameled wires to be tested are tested independently without affecting each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to make the content of the utility model easier to understand, the utility model is further described in detail according to the specific embodiments of the utility model in combination with the accompanying drawings, wherein

[0025] Figure 1 It is a structural schematic diagram of a device for testing the softening resistance of enameled wire in a preferred embodiment of the utility model;

[0026] Figure 2 yes Figure 1 Internal schematic diagram of

[0027] Figure 3 yes Figure 1 Schematic diagram of the structure of the test column;

[0028] Figure 4 The enameled wire to be tested is installed on Figure 1 A schematic diagram of the mounting bracket in FIG.

[0029] Description of the Figures in the Specification:

[0030] 100, box body; 110, cavity; 120, annular base; 121, jack; 130, cabinet body; 140, cover; 150, handle;

[0031] 200, mounting bracket; 210, main body; 211, through hole; 220, fan; 221, plug; 230, test column; 231, long test column; 232, short test column; 233, test column body; 234, conduction terminal; 235, locking piece;

[0032] 300, stage;

[0033] 400, enameled wire to be tested; 410, first wire to be tested; 420, second wire to be tested;

[0034] 500, counterweight;

[0035] 600, driving mechanism; 610, lead screw; 620, lead screw nut;

[0036] 700. Display window. DETAILED DESCRIPTION

[0037] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0038] In the comparative implementation, it is heated by electric heating tubes, and there is a distance difference between the electric heating tubes, the intersection of the sample and the position of the thermocouple. In this heating block under an open environment, the actual temperature of each point is different, which affects the test accuracy. Before the test, the sample (i.e. the enameled wire to be tested) needs to be passed through the small hole of the brass, which is inconvenient to operate, and it is easy for the operator to touch the heating block and get burned. After the threading, the thread head is easily displaced with the tightening of the broken paint nut when the test column is fixed, causing the intersection of the sample to deviate from the center of the small hole, and the center of gravity deviates from the intersection when the lifting rod is lowered to apply the load; the intersection is inside the brass block, and as the number of tests increases, the paint film residue that is easily accumulated and softened to carbonization is not easy to find and clean up at the intersection, which will affect the installation of the sample and the pressure applied by the load, etc. The ceramic pressure rod is used to apply the load to the small hole in the center of the brass block after the cross-crossing, and it is easy for the pressure rod to tilt and rub the hole wall, or even get stuck and fall in place, causing the applied load to be inaccurate. It can be seen from this that there is a large deviation in the test results in the comparative embodiment, and the test results of the same sample constant temperature method may be completely opposite. The test results of the same sample of high-temperature enameled wire tested by the temperature rise method usually have a deviation of 40 to 80°C; in addition, it can only test one enameled wire at a time, and the temperature needs to be lowered during the temperature rise test, which is time-consuming and has low test efficiency. Secondly, the existing technology cannot test sample wires with specifications below 0.10mm.

[0039] To solve the above problems, refer to Figure 1 to Figure 4 As shown, an embodiment of the utility model provides a device for softening and breakdown resistance testing of enameled wire, including: a box 100, a power supply, a heating mechanism, a temperature sensor, a mounting bracket 200, a counterweight 500 and a stage 300.

[0040] The box body 100 has a cavity 110 therein.

[0041] The power source is disposed at the bottom of the housing 100 .

[0042] The heating mechanism is arranged at the bottom of the box 100. In some comparative embodiments, electric heating tubes are used for heating. The heating effect is easily affected by environmental changes and the heat loss is large. The control accuracy of the heating rate is poor and the energy consumption is high. In this embodiment, the heating mechanism uses a constant temperature oven for heating, which uses a circulating fan to keep the temperature in the oven uniform and the heat loss is minimal. The oven adopts a 304 stainless steel liner, which has good corrosion resistance and is durable. Its maximum temperature can reach 600°C, which can meet the softening resistance test temperature requirements of all current series of enameled wire paint films. It can use a programmable thermostat to control the heating rate to ensure that the heating rate can be kept stable and adjustable in each heating section, such as: 5°C / min; it also has an over-temperature alarm and automatic power-off protection function. The constant temperature oven uses high-quality aluminum silicate insulation materials and thickened filling to ensure the insulation effect; the constant temperature oven is opened by opening the cover from above.

[0043] The temperature sensor is disposed in the cavity 110 .

[0044] The mounting bracket 200 includes a vertically arranged main body 210 and a plurality of circumferentially spaced segments 220 arranged on the outer wall of the main body 210. In some embodiments, there are 6 segments 220, one segment is arranged every 60°. The segment 220 is made of a ceramic heat-resistant non-conductive material. Three test columns 230 arranged in a triangular shape are arranged on the segment 220. In some embodiments, three small holes are arranged in an inverted triangle on the segment 220, and three test columns 230 are connected to the three small holes respectively. The test column 230 is divided into two long test columns 231 and a short test column 232, and the short test column 232 is arranged lower than the two long test columns 231, and one of the two long test columns 231 and the short test column 232 form a loop with the power supply; for example, one of the two long test columns 231 is connected to the positive pole of the power supply, and the short test column 232 is connected to the negative pole of the power supply; for another example, one of the two long test columns 231 is connected to the negative pole of the power supply, and the short test column 232 is connected to the positive pole of the power supply. The enameled wire 400 to be tested is divided into a first wire 410 to be tested and a second wire 420 to be tested; the counterweight 500 is connected to the second wire 420 to be tested, and is used to provide a load (i.e., weight) for the enameled wire 400 to be tested. The stage 300 can be raised and lowered and is located directly below the mounting bracket 200; when the sample is under the preheating state, the stage 300 is configured to rise to support the counterweight 500; when the sample is under the testing state, the stage 300 is separated from the counterweight 500, thereby applying a load to the enameled wire 400 to be tested. In addition, after the test is completed, the stage 300 rises and resets to temporarily support the counterweight 500. In some embodiments, the stage 300 is a circular ring structure.

[0045] Specifically, in the test of this embodiment, the two ends of the first test wire 410 of the enameled wire 400 to be tested are respectively connected to two long test columns 231, one end of the second test wire 420 is connected to the short test column 232, and the other end is naturally drooped after bypassing the first test wire 410 and hanging a counterweight block 500 of a specified weight, thereby forming a ring-shaped cross mode, which can meet the test of enameled wires of different specifications, especially the test of enameled wires of specifications below 0.10mm, and has a wide range of applications. And the self-load is applied by hanging the counterweight block 500 at the end of the enameled wire 400 to be tested, which effectively solves the load application deviation caused by the cross-cross method and ensures the test accuracy. In addition, this embodiment can test multiple groups of enameled wires 400 to be tested at one time, and the test efficiency is high. In this embodiment, since the test column 230 on each fan 220 forms an independent test circuit with the power supply, multiple groups of enameled wires 400 to be tested are tested independently without affecting each other.

[0046] The heating mechanism of the present application is adopted in a constant temperature oven, which can ensure that the test temperature of the sample is stably controlled and the heating rate is stable; the constant temperature oven has good thermal insulation effect and effectively saves energy; and multiple sample line tests can be completed at one time, thereby improving test efficiency.

[0047] Furthermore, the inner wall at the bottom of the cavity 110 is provided with an annular base 120 formed by an upward protrusion, and the stage 300 is lifted and lowered in the annular base 120. It is convenient for the stage 300 to be freely lifted and lowered within the limited height inside the annular base 120. Furthermore, a plurality of sockets 121 connected to the power supply are provided on the annular base 120 along the circumference; a plug 221 is provided at the bottom of the fan 220, and the plug 221 is connected to the socket 121, and the plug 221 is connected to one of the two long test columns 231 and the short test column 232. The plug 221 includes positive and negative electrodes. The positive and negative electrodes are connected to a long test column 231 and a short test column 232 on the fan 220 through a high temperature resistant wire. The socket 121 also includes positive and negative electrodes, and the positive and negative electrodes are connected to the power supply by a high temperature resistant wire.

[0048] Specifically, the plug 221 in this embodiment is connected to the jack 121, so that, on the one hand, the power supply is connected to the long test column 231 and the short test column 232. On the other hand, the mounting bracket 200 and the box 100 can be quickly installed and disassembled, ensuring that the mounting bracket 200 is stable and does not shake after installation and positioning, and is convenient and quick to use. The mounting bracket 200 in this embodiment is designed to be separated from the box 100, so that before testing, the mounting bracket 200 can be taken out and the enameled wire 400 to be tested can be installed on the mounting bracket 200 and then put into the box 100, which is convenient and quick to use.

[0049] Further, the present application also includes a driving mechanism 600 for driving the stage 300 to rise and fall, and the driving mechanism 600 is arranged at the bottom of the box 100; the driving mechanism 600 includes a motor, a lead screw 610 and a lead screw nut 620; the output end of the motor is coaxially connected to the lead screw 610, the lead screw 610 is vertically arranged and threadedly connected to the lead screw nut 620, the lead screw nut 620 is connected to the stage 300, and the motor drives the lead screw nut 620 and the stage 300 to rise and fall synchronously. When the stage 300 rises and falls, the control unit (described below) records the start timing of the test start, and the motor reverses and descends when the test standard specifies the duration. In some embodiments, the motor is arranged at the bottom of the box 100, and the lead screw 610 extends vertically from the bottom of the box 100 to the annular base 120. The driving mechanism 600 further includes a vertically arranged guide rail (not shown in the figure) and a slider (not shown in the figure) matched with the guide rail, the guide rail is vertically arranged on the inner wall of the annular base 120 in the cavity 110, and the slider is connected to the stage 300. Specifically, the structure of this embodiment is simple, and the operation is stable and reliable.

[0050] Furthermore, the counterweight 500 has a variety of weight specifications, and can provide different loads according to test requirements. Specifically, this embodiment can be applied to tests with different load requirements, and has a wide range of applications.

[0051] Further, the length of the short test column 232 is less than the length of the long test column 231. Specifically, one end of the second test line 420 of this embodiment is connected to the short test column 232, and the other end of the second test line 420 is wound around the first test line 410 and then connected to the counterweight 500. In this way, the second test line 420 located at the back side of the first test line 410 is the first section, and the second test line 420 located at the front side of the first test line 410 is the second section. The length of the short test column 232 in this embodiment is less than the length of the long test column 231, so that there can be a large gap between the first section and the second end, thereby avoiding the two being too close to affect the test structure.

[0052] Furthermore, a through hole 211 is provided in the main body 210, and the lead screw 610 is located in the through hole 211. Specifically, the design of the through hole 211 in this embodiment reduces weight on the one hand, and plays a role in circumferential limitation of the mounting bracket 200 on the other hand.

[0053] Furthermore, the test column 230 includes an insulated test column body 233, a conducting terminal 234, and a locking member 235. One end of the test column body 233 is connected to the fan 220, and the conducting terminal 234 is connected to the other end of the test column body 233. The conducting terminal 234 is connected to the power supply; in some embodiments, one of the two long test columns 231 and the short test column 232 are connected to the plug 221. The locking member 235 is threadedly connected to the conducting terminal 234.

[0054] Specifically, the conducting terminal 234 in this embodiment can conduct the enameled wire 400 to be tested and the power supply, and the locking member 235 fixes the enameled wire 400 to be tested and the conducting terminal 234. The test column body 233 allows a gap between the enameled wire 400 to be tested and the fan 220 to avoid contact between the two and affect the test.

[0055] Further, the box 100 includes a cabinet 130 and a cover 140, and the cover 140 is hingedly connected to the top of the cabinet 130. Specifically, this embodiment facilitates opening the box 100 to take out the enameled wire 400 to be tested before or after the test, and can ensure that the test cavity 110 is a closed space.

[0056] Furthermore, a handle 150 is provided on the front of the cover 140. In this way, the cover 140 can be opened and closed more conveniently.

[0057] In some embodiments, the present application further includes a control unit, which can be disposed at the bottom of the box 100. The control unit is electrically connected to the power supply, the heating mechanism, the temperature sensor, the driving mechanism 600, etc., to realize automated testing.

[0058] In some embodiments, the present application further includes an alarm mechanism, which can be disposed at the bottom of the box 100. The alarm mechanism is connected to the control unit.

[0059] In some embodiments, the present application further includes a display window 700 , which is connected to the control unit.

[0060] During the test, when the softened breakdown leakage current in a group of enameled wires 400 to be tested reaches a threshold value (for example, 5.0±0.5mA), the alarm mechanism sounds an alarm to stop the test, and the corresponding test results are displayed on the corresponding display window 700 (for example, the constant temperature method displays qualified or unqualified; the temperature increase method displays the breakdown temperature and test duration).

[0061] The process of testing using this application is as follows (using 6 fan blades 220 as an example):

[0062] Six enameled wires 400 to be tested are selected, and each enameled wire 400 to be tested is connected to a corresponding fan 220 .

[0063] The mounting bracket 200 is removed from the box 100 and then the enameled wires 400 to be tested are hung outside the box 100. Each group of enameled wires 400 to be tested is divided into a first test wire 410 and a second test wire 420. The two ends of the first test wire 410 are respectively connected to two long test columns 231, one end of the second test wire 420 is connected to a short test column 232, and the other end is naturally hung down after passing through the first test wire 410 and hung with a counterweight 500 of a specified weight. After each group of enameled wires 400 to be tested is installed, the mounting bracket 200 is installed in the cavity 110, that is, the plug 221 is inserted into the jack 121.

[0064] The control unit controls the heating mechanism to start preheating. Before preheating, the driving mechanism 600 drives the stage 300 to rise to support the counterweight 500. At this time, the enameled wire 400 to be tested is not loaded. The cover 140 is closed, and the test button is activated to apply a specified (for example, 100±10V) AC voltage to the enameled wire 400 to be tested. After the constant temperature is maintained for a specified period of time, the motor reverses to drive the stage 300 to lower and detach from the counterweight 500, and the timing test or the temperature rise test is started.

[0065] When the paint film of any enameled wire 400 to be tested is softened at high temperature and breaks down under the weight of the counterweight 500, causing a short circuit, an alarm is triggered when the leakage current reaches a specified value (for example, 5±0.5mA), and the short-circuited enameled wire 400 to be tested correspondingly displays the softening breakdown temperature value and the test duration in the display window 700 instantaneously. This is until all 6 groups of enameled wires 400 to be tested have completed the test. (When the temperature rise method is used for testing, the heating mechanism automatically cools down to the expected set value, and the temperature of the constant temperature method test remains unchanged).

[0066] In addition, during the test, the operator can take another set of mounting brackets 200 to install the enameled wire 400 to be tested in advance. After the previous set of tests is completed and the temperature of the constant temperature oven reaches the expected value, the operator can wear high temperature resistant gloves to quickly open the cover 140 and take out the previous set of mounting brackets 200, and install the next set of mounting brackets 200 on the annular base 120, cover the cover 140, and start the next round of testing.

[0067] The present application effectively solves the problem in the prior art that multiple adverse factors affect the accuracy of the test results, and greatly improves the test efficiency, while saving energy and reducing the risk of burns during operation.

[0068] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. A device for testing the softening resistance of enameled wire, characterized in that: include: A box body having a cavity therein; A power supply is arranged at the bottom of the box; A heating mechanism is arranged at the bottom of the box; A temperature sensor is disposed in the cavity; The mounting bracket comprises a main body arranged vertically and a plurality of fan blades arranged on the outer wall of the main body at intervals along the circumferential direction; the fan blades are provided with three test columns arranged in a triangle, the test columns are divided into two long test columns and one short test column, the short test column is arranged lower than the two long test columns, and one of the two long test columns and the short test column form a loop with a power supply; The counterweight block is used to provide load for the enameled wire to be tested; The loading platform can be raised and lowered and is located directly below the mounting bracket; when the sample is under the preheating state, the loading platform is configured to rise to support the counterweight block; when the sample is under the testing state, the loading platform is separated from the counterweight block.

2. The device for testing the softening resistance of enameled wire according to claim 1, characterized in that: The inner wall of the bottom of the cavity is provided with an annular base which is protruded upward, and the loading platform is lifted up and down in the annular base.

3. The device for testing the softening resistance of enameled wire according to claim 2, characterized in that: The annular base is provided with a plurality of sockets connected to the power source along the circumferential direction; a plug is provided at the bottom of the fan, the plug is connected to the sockets, and the plug is connected to one of the two long test columns and the short test column.

4. The device for testing the softening resistance of enameled wire according to claim 1 or 2, characterized in that: It also includes a driving mechanism for driving the loading platform to move up and down, and the driving mechanism is arranged at the bottom of the box; the driving mechanism includes a motor, a lead screw and a lead screw nut; the output end of the motor is coaxially connected to the lead screw, the lead screw is vertically arranged and threadedly connected to the lead screw nut, and the lead screw nut is connected to the loading platform, and the motor drives the lead screw nut and the loading platform to move up and down synchronously when working.

5. The device for testing the softening resistance of enameled wire according to claim 4, characterized in that: The driving mechanism further comprises a vertically arranged guide rail and a sliding block matched with the guide rail, wherein the guide rail is vertically arranged on the inner wall of the cavity, and the sliding block is connected to the loading platform.

6. The device for testing the softening resistance of enameled wire according to claim 1, characterized in that: The counterweight block has various weight specifications.

7. The device for testing the softening resistance of enameled wire according to claim 1, characterized in that: The length of the short test column is shorter than the length of the long test column.

8. The device for testing the softening resistance of enameled wire according to claim 4, characterized in that: A through hole is provided in the main body, and the lead screw is located in the through hole.

9. The device for testing the softening resistance of enameled wire according to claim 1, characterized in that: The test column includes an insulating test column body, a conductive terminal and a locking piece; one end of the test column body is connected to the fan sheet, the conductive terminal is connected to the other end of the test column body, and the conductive terminal is conductive to the power supply; the locking piece is connected to the conductive terminal.

10. The device for testing the softening resistance of enameled wire according to claim 1, characterized in that: The box body comprises a cabinet body and a cover, and the cover is openably connected to the top of the cabinet body.

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