A device for testing the elongation of enameled wire film after aging

Abstract

The present application discloses a device for testing the elongation of the film of an enameled wire after aging, which belongs to the technical field of enameled wire testing. The key points of the technical solution are as follows: the device comprises a testing machine body; a first fixture connected to an upper clamping fixture, the center of gravity of the first fixture being on the same vertical line as the center of gravity of the upper clamping fixture, the first fixture comprising a connecting block, a counterweight block, a mounting frame and a clamping assembly, the connecting block being connected to the upper clamping fixture, the counterweight block being connected to the connecting block, and the mounting frame being connected to the counterweight block; the clamping assembly comprising a first clamping plate, a second clamping plate and an adjusting rod, the first clamping plate being connected to the counterweight block, the second clamping plate being slidably connected to the mounting frame, the adjusting rod being threadedly connected to the mounting frame and connected to the second clamping plate; the first clamping plate is provided with a first wavy portion, the second clamping plate is provided with a second wavy portion, for clamping the enameled wire; and a second fixture connected to a lower clamping fixture, the center of gravity of the second fixture being on the same vertical line as the center of gravity of the lower clamping fixture, so as to achieve the effect of improving the practicability of the testing device.

Description

Technical Field

[0001] The present application relates to the technical field of enameled wire testing, and in particular to a device for testing the elongation of the film of an enameled wire after aging. Background Art

[0002] Enameled wire is a main type of winding wire, which consists of a conductor and an insulating layer. The bare wire is annealed and softened, then painted and baked for many times. However, it is not easy to produce products that meet both standard requirements and customer requirements. It is affected by factors such as raw material quality, process parameters, production equipment, and environment. Therefore, the quality characteristics of various enameled wires are different, but they all have four major properties: mechanical properties, chemical properties, electrical properties, and thermal properties.

[0003] In order to understand the performance of enameled wire more accurately, the enameled wire after aging is generally tested for elongation using a tensile testing machine. The tensile testing machine includes a frame, an upper clamping fixture and a lower clamping fixture, and both the upper clamping fixture and the lower clamping fixture are connected to the frame. The structures of the upper clamping fixture and the lower clamping fixture are symmetrical and made of the same material. When the upper clamping fixture is opened, a T-shaped upper connecting groove is formed. When the lower clamping fixture is opened, an inverted T-shaped lower connecting groove is formed. When testing the aged enameled wire, one end of the enameled wire is fed into the upper connecting groove and fixed, and the other end is fed into the lower connecting groove and fixed to achieve the clamping of the enameled wire.

[0004] However, the upper clamping fixture and the lower clamping fixture are generally ceramic fixtures or metal dense groove fixtures. During use, the ceramic fixture is not suitable for round enameled wire, and it is easy to slip, resulting in unreliable experimental data and poor practicality. The metal dense groove fixture is likely to cause destructive damage to the aged film. When the film tensile rate of the aged round enameled wire is tested, only the two points where the round enameled wire contacts the fixture are stressed, and the sharp dense grooves of the metal dense groove fixture are likely to pierce the film of the round enameled wire, causing copper exposure, which in turn leads to test failure and poor practicality. Summary of the invention

[0005] In order to improve the practicability of an elongation testing device, the present invention provides a device for testing the elongation of an enameled wire film after aging.

[0006] The present invention provides a device for testing the elongation of the enameled wire film after aging, which adopts the following technical solution:

[0007] A device for testing the elongation of the film of an enameled wire after aging, comprising a testing machine body, the testing machine body comprising an upper clamping fixture and a lower clamping fixture; a first fixture connected to the upper clamping fixture, and the center of gravity of the first fixture is on the same vertical line as the center of gravity of the upper clamping fixture, the first fixture comprises a connecting block, a counterweight block, a mounting frame and a clamping assembly, the connecting block extends into an upper connecting groove and is connected to the upper clamping fixture, for fixing the connecting block, the counterweight block is connected to the connecting block, and the mounting frame is connected to the counterweight block; the clamping assembly comprises a first clamping plate, a second clamping plate and an adjusting rod, the first clamping plate is connected to the counterweight block, the The second clamping plate is slidably connected to the mounting frame, the adjusting rod is threadedly connected to the mounting frame, and the adjusting rod is connected to the second clamping plate for adjusting the distance between the second clamping plate and the first clamping plate; the first clamping plate is provided with a first wave portion on the side wall close to the second clamping plate, and the second clamping plate is provided with a second wave portion on the side wall close to the first clamping plate, the first wave portion and the second wave portion both extend in a vertical direction, the first wave portion and the second wave portion match each other, and can realize clamping of the enameled wire; and a second tooling, which is connected to the lower clamping tooling, and the center of gravity of the second tooling is on the same vertical line as the center of gravity of the lower clamping tooling.

[0008] By adopting the above technical solution, when using, first place the connection block of the first fixture in the upper connection groove, adjust the upper clamping fixture to clamp the first fixture, and then use the lower clamping fixture to clamp the second fixture. Then, clamp the first test end of the enameled wire with the first fixture, and clamp the second test end of the enameled wire with the second fixture, and start the test machine body to start the test.

[0009] The design of the counterweight makes the center of gravity of the first fixture and the center of gravity of the upper clamping fixture on the same vertical line. Reduce the stress between the first fixture and the upper clamping fixture, reduce the loss of the first fixture and the upper clamping fixture, and increase the service life of the first fixture and the upper clamping fixture. Improve the stability of the device during the test, thereby improving the accuracy of the test. If the center of gravity of the first fixture and the center of gravity of the upper clamping fixture are not on the same vertical line, the enameled wire will have an angle during the test, resulting in uneven force on the enameled wire and damage, etc., which directly causes the test failure.

[0010] When using the clamping assembly to clamp the enameled wire, the enameled wire is placed between the first clamping plate and the second clamping plate, and the first wavy portion and the second wavy portion cooperate with each other, which not only improves the stability of the clamping and reduces the possibility of the enameled wire slipping during the test, but also makes the enameled wire evenly stressed, further reduces the possibility of damage to the enameled wire due to excessive local pressure, and improves the practicality of the elongation test device for the aged enameled wire.

[0011] Even when the film elongation test is performed on the round enameled wire, the first wave portion and the second wave portion increase the contact area with the round enameled wire, reduce the possibility of sliding of the round enameled wire, and thus improve the practicality of the elongation test device for the aged enameled wire.

[0012] Preferably, the wave heights of the first wave portion and the second wave portion are both 3.7 mm.

[0013] By adopting the above technical solution, the design of the specific wave height of the first wave part and the second wave part can not only clamp the enameled wire, but also ensure the integrity of the enameled wire. If the aged enameled wire is subjected to a large bending force, it is easy to be damaged, which reduces the accuracy of the experimental results. At the same time, some enameled wires contain copper wires, which have a high hardness and are not easy to bend. If the wave height is too large, the enameled wire cannot be clamped well. Considering various factors, the calculated wave height is preferably 3.7mm, which can ensure that the enameled wire is evenly stressed during the clamping process and reduce the possibility of clamping.

[0014] Preferably, the bottom end of the first clamping plate is chamfered close to the edge of the second clamping plate, and the bottom end of the second clamping plate is chamfered close to the edge of the first clamping plate.

[0015] By adopting the above technical solution, during the test, if an angle is formed between the enameled wire and the first clamping plate and the second clamping plate, the chamfer setting can reduce the possibility of the first clamping plate and the second clamping plate damaging the enameled wire, thereby ensuring the normal progress of the experiment.

[0016] Preferably, the weight of the counterweight accounts for two-thirds of the weight of the first tooling.

[0017] By adopting the above technical solution, during the enameled wire testing process, the counterweight block makes the center of gravity of the first fixture and the center of gravity of the upper clamping fixture located on the same vertical line, thereby enhancing the stability of the device and improving the stability of the device testing.

[0018] Preferably, the counterweight block includes a first surface and a second surface, the first surface is vertically arranged, the mounting frame is located on the first surface of the counterweight block, the second surface is obliquely arranged above the mounting frame, and the angle between the second surface and the first surface is 130 degrees.

[0019] By adopting the above technical solution, when the clamping assembly clamps the enameled wire, under normal circumstances, the length of the enameled wire tested after aging is 20 cm. If the length of the enameled wire is too long, the enameled wire can pass between the second surface and the mounting frame. Since some enameled wires contain copper wires, which have high hardness and are not easy to bend, while ensuring the counterweight of the counterweight block, the possibility of damage to the enameled wire after aging is reduced as much as possible. The angle between the first surface and the second surface is 130 degrees, so that the excess length of the enameled wire can be fully extended during the enameled wire testing process without cutting off the excess.

[0020] Preferably, a screw is provided between the connecting block and the counterweight block, the first end of the screw is inserted into the connecting block and threadedly connected to the connecting block, the second end of the screw passes through the counterweight block and protrudes from the side wall of the counterweight block, and the screw is threadedly connected to the counterweight block.

[0021] By adopting the above technical solution, the screw rod facilitates the disassembly and assembly of the connecting block and the counterweight block. The screw rod runs through the counterweight block, which can ensure that the counterweight block does not have an angular offset with the connecting block, thereby preventing the counterweight block, the mounting frame and the clamping assembly from tilting. If the screw rod does not protrude from the counterweight block, the force-bearing area of ​​the counterweight block is reduced, which is likely to cause the counterweight block to tilt, thereby causing the clamping assembly to tilt.

[0022] Preferably, an adjustment block is provided between the connecting block and the counterweight block, the adjustment block is threadedly connected to the screw rod, and the adjustment block abuts against the bottom of the connecting block to limit the orientation of the connecting block.

[0023] By adopting the above technical solution, since the adjusting rod and the connecting block are on the same screw rod, the position of the adjusting block can be changed, and then the connecting block is abutted against the adjusting block, so that the direction of the connecting block can be adjusted, and then when the connecting block is installed in the upper connecting groove, the adjusting rod of the clamping assembly can be close to the operator, which is convenient for clamping and releasing the enameled wire.

[0024] Preferably, the mounting frame includes a positioning rod and a mounting plate, the positioning rod passes through the counterweight block, the positioning rod is fixedly connected to the counterweight block, the mounting plate is sleeved on the positioning rod and fixedly connected to the positioning rod, and a distance is left between the mounting plate and the counterweight block; the first clamping plate and the second clamping plate are both arranged between the mounting plate and the counterweight block, the first clamping plate is connected to the counterweight block, the second clamping plate is sleeved on the positioning rod and slidably connected to the positioning rod, and the adjusting rod passes through the mounting plate and is threadedly connected to the mounting plate.

[0025] By adopting the above technical solution, the first clamping plate and the second clamping plate can move between the mounting plate and the counterweight block, the mounting plate is used to install the adjusting rod, the positioning rod guides the second clamping plate, and the mounting plate and the positioning plate assist the clamping assembly to smoothly clamp the enameled wire.

[0026] Preferably, the adjusting rod abuts against the second clamping plate, and one end of the adjusting rod close to the second clamping plate is hemispherical.

[0027] By adopting the above technical solution, the arc-shaped adjusting rod reduces the wear on the second clamping plate when driving the second clamping plate to approach the first clamping plate, thereby increasing the service life of the second clamping plate.

[0028] Preferably, a spring is sleeved on the positioning rod, and the spring sleeve is located between the first clamping plate and the second clamping plate. The first end of the spring is connected to the first clamping plate, and the second end is connected to the second clamping plate, so as to realize automatic resetting of the second clamping plate.

[0029] By adopting the above technical solution, when the enameled wire is loosened, when the adjusting rod is rotated away from the first clamping plate, the spring moves the second clamping plate away from the first clamping plate to prepare for the next clamping. At the same time, when clamping the aged enameled wire, it should not be clamped too tightly, otherwise the paint will be broken. The spring provides a reverse force between the first clamping plate and the second clamping plate, reducing the possibility of the paint breaking due to clamping too tightly when clamping the aged enameled wire.

[0030] In summary, the present invention has the following beneficial effects:

[0031] When in use, first place the connection block of the first fixture in the upper connection groove, and adjust the upper clamping fixture to clamp the first fixture. Then use the lower clamping fixture to clamp the second fixture. Then clamp the first test end of the enameled wire with the first fixture, and the second test end of the enameled wire with the second fixture, and start the testing machine body to start the test. The design of the counterweight block makes the center of gravity of the first fixture and the center of gravity of the upper clamping fixture on the same vertical line. Reduce the stress between the first fixture and the upper clamping fixture, reduce the loss of the first fixture and the upper clamping fixture, and increase the service life of the first fixture and the upper clamping fixture. Improve the stability of the device during the test, thereby improving the accuracy of the test. If the center of gravity of the first fixture and the center of gravity of the upper clamping fixture are not on the same vertical line, the enameled wire will have an angle during the test, resulting in uneven force on the enameled wire and damage, etc., which directly causes the test failure.

[0032] When the clamping assembly is used to clamp the enameled wire, the enameled wire is placed between the first clamping plate and the second clamping plate, and the first wave portion and the second wave portion cooperate with each other, which not only improves the stability of the clamping and reduces the possibility of the enameled wire sliding during the test, but also makes the enameled wire evenly stressed, further reduces the possibility of damage to the enameled wire due to excessive local pressure, and improves the practicality of the tensile testing machine for the elongation test of the aged enameled wire. Even when the film elongation test is performed on the round enameled wire, the first wave portion and the second wave portion increase the contact area with the round enameled wire, reduce the possibility of the round enameled wire sliding, and thus improve the practicality of the tensile testing machine for the elongation test of the aged enameled wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 The present invention is a schematic diagram of the overall structure of a device for testing the elongation of the film of an enameled wire after aging.

[0034] Figure 2 It is a structural schematic diagram of the first tooling.

[0035] Figure 3 It is a side view of the first tooling.

[0036] Figure 4 It is an exploded diagram of the screw and counterweight.

[0037] Figure 5 It is an exploded view of the mounting plate and the positioning rod.

[0038] Description of reference numerals:

[0039] 1. Testing machine body; 11. Upper clamping fixture; 111. Main body; 112. First clamping part; 113. Second clamping part; 12. Lower clamping fixture; 2. Connecting block; 3. Screw; 4. Adjusting block; 5. Counterweight; 51. Threaded hole; 52. First surface; 53. Second surface; 6. Positioning rod; 61. Spring; 7. Mounting plate; 8. Clamping assembly; 81. First clamping plate; 82. Second clamping plate; 83. Adjusting rod. DETAILED DESCRIPTION

[0040] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0041] A device for testing the elongation of the film of enameled wire after aging, referring to Figure 1 and Figure 2 , including a testing machine body 1, a first fixture and a second fixture, the first fixture is connected to the upper clamping fixture 11, the center of gravity of the first fixture is in the same vertical line as the center of gravity of the upper clamping fixture 11, the second fixture is connected to the lower clamping fixture 12, the center of gravity of the second fixture is in the same vertical line as the center of gravity of the lower clamping fixture 12. The first clamping fixture includes a connecting block 2, a counterweight block 5, a mounting frame and a clamping assembly 8, the connecting block 2 extends into the upper connecting groove and is clamped with the upper clamping fixture 11, so as to fix the connecting block 2. The counterweight block 5 is connected to the connecting block 2, and the mounting frame is connected to the counterweight block 5. The clamping assembly 8 includes a first clamping plate 81, a second clamping plate 82 and an adjusting rod 83, the first clamping plate 81 is connected to the mounting frame, the second clamping plate 82 is slidably connected to the mounting frame, the adjusting rod 83 is threadedly connected to the mounting frame, and the adjusting rod 83 is connected to the second clamping plate 82, which is used to adjust the distance between the second clamping plate 82 and the first clamping plate 81. The side wall of the first clamping plate 81 close to the second clamping plate 82 is in a first wave shape, and the side wall of the second clamping plate 82 close to the first clamping plate 81 is in a second wave shape. Both the first wave and the second wave extend in the vertical direction, and the first wave and the second wave match each other to achieve clamping of the enameled wire.

[0042] When in use, first place the connecting block 2 of the first tooling in the upper connecting groove, and adjust the upper clamping tooling 11 to clamp the first tooling. Then use the lower clamping tooling 12 to clamp the second tooling. Subsequently, the first test end of the enameled wire is clamped using the first tooling, and the second test end of the enameled wire is clamped using the second tooling, and the testing machine body 1 is started to start the test. When using the clamping assembly 8 to clamp the enameled wire, the enameled wire is placed between the first clamping plate 81 and the second clamping plate 82, and the first wavy portion and the second wavy portion cooperate with each other, which not only improves the stability of the clamping and reduces the possibility of the enameled wire slipping during the test, but also makes the enameled wire evenly stressed, further reduces the possibility of damage to the enameled wire due to excessive local pressure, and improves the practicality of the tensile testing machine for the elongation test of the aged enameled wire.

[0043] Reference Figure 1 The upper clamping tool 11 includes a main body 111, a first clamping portion 112 and a second clamping portion 113. The first clamping portion 112 and the second clamping portion 113 are symmetrically arranged. The first clamping portion 112 and the second clamping portion 113 are both slidably connected to the main body 111, and a T-shaped upper connecting groove is formed between the first clamping portion 112 and the second clamping portion 113. The structure of the lower clamping tool 12 is symmetrical to that of the upper clamping tool 11.

[0044] Reference Figure 1 In this embodiment, the structure of the second tooling is symmetrical to the structure of the first tooling. Therefore, this embodiment only describes the structure of the first tooling in detail.

[0045] Reference Figure 2 The connecting block 2 is in an I-shaped shape. Both sides of the connecting block 2 are arc surfaces. The outer surface of the connecting block 2 is rough. When the connecting block 2 is inserted into the upper connecting groove, the side wall of the connecting block 2 is flush with the side wall of the first clamping portion 112.

[0046] The I-shaped connecting block 2 is easy to connect with the upper connecting groove and is not easy to fall out of the upper connecting groove. The rough outer surface further reduces the possibility of the connecting block 2 being offset during the test process.

[0047] Reference Figure 3 A screw rod 3 is provided between the connection block 2 and the counterweight block 5. The screw rod 3 is vertically arranged, and the top end of the screw rod 3 is inserted into the connection block 2 and threadedly connected with the connection block 2. The axis of the screw rod 3 passes through the center of gravity of the connection block 2. The center of gravity of the connection block 2 and the screw rod 3 is realized to be on the same vertical line as the upper clamping fixture 11.

[0048] Reference Figure 3 and Figure 4 A threaded hole 51 is vertically opened on the top surface of the counterweight block 5 , and the second end of the screw rod 3 passes through the threaded hole 51 and protrudes from the side wall of the counterweight block 5 , and the screw rod 3 is threadedly connected to the counterweight block 5 .

[0049] The screw rod 3 passes through the counterweight block 5, which can ensure that the counterweight block 5 will not have an angular offset with the connecting block 2, thereby preventing the counterweight block 5, the mounting frame and the clamping assembly 8 from tilting. If the screw rod 3 does not protrude from the counterweight block, the force-bearing area of ​​the counterweight block 5 is reduced, which may cause the counterweight block 5 to tilt, thereby causing the clamping assembly 8 to tilt.

[0050] Reference Figure 3 The screw rod 3 is threadedly connected with an adjusting block 4, which is arranged between the connecting block 2 and the counterweight block 5, and the adjusting block 4 abuts against the bottom of the connecting block 2. Since the adjusting rod 83 and the connecting block 2 are on the same screw rod 3, the direction of the connecting block 2 can be adjusted by changing the position of the adjusting block 4 and then making the connecting block 2 abut against the adjusting block 4, so that when the connecting block 2 is installed in the upper connecting groove, the adjusting rod 83 of the clamping assembly 8 can be close to the operator, which is convenient for clamping and releasing the enameled wire.

[0051] Reference Figure 3 , the counterweight block 5 and the mounting frame are both arranged below the connecting block 2. The weight of the counterweight block 5 accounts for two-thirds of the weight of the first tooling.

[0052] The design of the counterweight block 5 makes the center of gravity of the first fixture and the center of gravity of the upper clamping fixture 11 on the same vertical line. The stress between the first fixture and the upper clamping fixture 11 is reduced, the loss of the first fixture and the upper clamping fixture 11 is reduced, and the service life of the first fixture and the upper clamping fixture 11 is increased. The stability of the device during the test is improved, thereby improving the accuracy of the test. If the center of gravity of the first fixture and the center of gravity of the upper clamping fixture 11 are not on the same vertical line, the enameled wire will have an angle during the test, resulting in uneven force on the enameled wire and damage, etc., which directly causes the test failure.

[0053] Reference Figure 3 The counterweight 5 includes a first surface 52 and a second surface 53. The first surface 52 is vertically arranged and connected to the mounting frame. The second surface 53 is inclined and adjacent to the first surface 52 and located above the mounting frame. The angle between the first surface 52 and the second surface 53 is 130 degrees.

[0054] Since some enameled wires contain copper wires, which are hard and not easy to bend, the counterweight block 5 can be ensured to balance the weight while minimizing the possibility of damage to the enameled wire after aging. The angle between the first surface 52 and the second surface 53 is 130 degrees, so that the excess length of the enameled wire can be fully extended during the enameled wire testing process without cutting off the excess.

[0055] Reference Figure 3 and Figure 5The mounting frame includes a positioning rod 6 and a mounting plate 7. Two positioning rods 6 are arranged horizontally, and the two positioning rods 6 correspond to the two ends of the counterweight block 5 in a horizontal direction. The positioning rods 6 penetrate the counterweight block 5 and are fixedly connected to the counterweight block 5. The mounting plate 7 is arranged vertically, and the mounting plate 7 is sleeved on the two positioning rods 6, and the mounting plate 7 is fixedly connected to the positioning rods 6. A distance is left between the mounting plate 7 and the counterweight block 5. The first clamping plate 81 and the second clamping plate 82 are both arranged between the mounting plate 7 and the counterweight block 5.

[0056] The first clamping plate 81 and the second clamping plate 82 can move between the mounting plate 7 and the counterweight 5. The mounting plate 7 is used to install the adjusting rod 83. The positioning rod 6 guides the second clamping plate 82. The mounting plate 7 and the positioning plate assist the clamping assembly 8 to smoothly clamp the enameled wire.

[0057] Reference Figure 4 and Figure 5 The cross section of the first clamping plate 81 is a convex shape. The first clamping plate 81 includes a first base and a first protrusion. The first protrusion is integrally formed with the first base. The first base is fixedly connected to the first surface 52 of the counterweight 5. The first protrusion is located on the side wall of the first base close to the second clamping plate 82. The first protrusion is located between the two positioning rods 6. The first wave portion is arranged on the protrusion of the first clamping plate 81.

[0058] Reference Figure 4 and Figure 5 The cross section of the second clamping plate 82 is a convex shape. The second clamping plate 82 includes a second base and a second protrusion. The second protrusion is integrally formed with the second base. The second base is sleeved on the two positioning rods 6 and is slidably connected to the two positioning rods 6. The second protrusion is located on the side wall of the second base close to the second clamping plate 82, and the second protrusion is located between the two positioning rods 6. The second wave portion is arranged on the protrusion of the second clamping plate 82.

[0059] Reference Figure 3 The top surface of the first protrusion is flush with the top surface of the first base, and the bottom surface of the first protrusion is flush with the bottom surface of the first base. The bottom surface of the first base is flush with the bottom surface of the second base. The top surface of the second base is lower than the top surface of the first base.

[0060] The top surface of the second protrusion is lower than the first protrusion, so that the overlong enameled wire can be extended easily.

[0061] Reference Figure 3 The bottom end of the first protrusion is chamfered near the edge of the second clamping plate 82, and the bottom end of the second protrusion is chamfered near the edge of the first clamping plate 81.

[0062] During the test, if an angle is formed between the enameled wire and the first clamping plate 81 and the second clamping plate 82 , the chamfering setting can reduce the possibility of the first clamping plate 81 and the second clamping plate 82 damaging the enameled wire, thereby ensuring the normal progress of the experiment.

[0063] Reference Figure 3 A spring 61 is sleeved on the positioning rod 6, and the spring 61 is located between the first base and the second base. The first end of the spring 61 is fixedly connected to the first base, and the second end of the spring 61 is fixedly connected to the second base.

[0064] When the adjusting rod 83 is rotated away from the first clamping plate 81, the spring 61 moves the second clamping plate 82 away from the first clamping plate 81 to prepare for the next clamping. At the same time, when clamping the aged enameled wire, it should not be clamped too tightly, otherwise the paint will break. The spring 61 provides a reverse force between the first clamping plate 81 and the second clamping plate 82 to reduce the possibility of the paint breaking due to clamping too tightly when clamping the aged enameled wire.

[0065] Reference Figure 5 The adjusting rod 83 passes horizontally through the mounting plate 7 and is threadedly connected to the mounting plate 7. The adjusting rod 83 abuts against the second base. One end of the adjusting rod 83 close to the second base is hemispherical.

[0066] The arc-shaped adjusting rod 83 reduces the wear on the second clamping plate 82 when driving the second clamping plate 82 to approach the first clamping plate 81 , thereby increasing the service life of the second clamping plate 82 .

[0067] The use principle of the present application is as follows: when in use, first place the connection block 2 of the first fixture in the upper connection groove, adjust the upper clamping fixture 11 to clamp the first fixture, so that the center of gravity of the first fixture and the center of gravity of the upper clamping fixture 11 are located on the same vertical line. Place the second fixture in the lower connection groove, use the lower clamping fixture 12 to clamp the second fixture, so that the center of gravity of the second fixture and the center of gravity of the lower clamping fixture 12 are located on the same vertical line. Then, clamp the first test end of the enameled wire with the first fixture, clamp the second test end of the enameled wire with the second fixture, and start the test machine body 1 to start the test.

[0068] When the clamping assembly 8 is used to clamp the enameled wire, the enameled wire is placed between the first clamping plate 81 and the second clamping plate 82, and the first wave portion and the second wave portion cooperate with each other to clamp the enameled wire. This improves the stability of the clamping, reduces the possibility of the enameled wire slipping during the test, and makes the enameled wire evenly stressed, further reduces the possibility of damage to the enameled wire due to excessive local pressure, and improves the practicality of the tensile testing machine for testing the elongation of the aged enameled wire.

[0069] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, all equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for testing the elongation of enameled wire film after aging, characterized in that: include: A testing machine body (1), the testing machine body (1) comprising an upper clamping fixture (11) and a lower clamping fixture (12); The first fixture is connected to the upper clamping fixture (11), and the center of gravity of the first fixture is on the same vertical line as the center of gravity of the upper clamping fixture (11). The first fixture comprises a connecting block (2), a counterweight block (5), a mounting frame and a clamping assembly (8). The connecting block (2) extends into the upper connecting groove and is connected to the upper clamping fixture (11) to fix the connecting block (2). The counterweight block (5) is connected to the connecting block (2), and the mounting frame is connected to the counterweight block (5). The clamping assembly (8) comprises a first clamping plate (81), a second clamping plate (82) and an adjusting rod (83). The first clamping plate (81) and the counterweight block (5) are connected to each other. ), the second clamping plate (82) is slidably connected to the mounting frame, the adjusting rod (83) is threadedly connected to the mounting frame, and the adjusting rod (83) is connected to the second clamping plate (82) for adjusting the distance between the second clamping plate (82) and the first clamping plate (81); the first clamping plate (81) is provided with a first wave portion on the side wall close to the second clamping plate (82), and the second clamping plate (82) is provided with a second wave portion on the side wall close to the first clamping plate (81), the first wave portion and the second wave portion both extend in the vertical direction, the first wave portion and the second wave portion match each other, and can achieve clamping of the enameled wire; as well as The second tooling is connected to the lower clamping tooling (12), and the center of gravity of the second tooling is on the same vertical line as the center of gravity of the lower clamping tooling (12).

2. The device for testing the elongation of the enameled wire after aging according to claim 1, characterized in that: The wave heights of the first wave portion and the second wave portion are both 3.7 mm.

3. The device for testing the elongation of the enameled wire after aging according to claim 1, characterized in that: The bottom end of the first clamping plate (81) is chamfered near the edge of the second clamping plate (82), and the bottom end of the second clamping plate (82) is chamfered near the edge of the first clamping plate (81).

4. The device for testing the elongation of the enameled wire after aging according to claim 1, characterized in that: The weight of the counterweight (5) accounts for two thirds of the weight of the first tooling.

5. The device for testing the elongation of the enameled wire after aging according to claim 1, characterized in that: The counterweight block (5) comprises a first surface (52) and a second surface (53), the first surface (52) being arranged vertically, the mounting frame being located on the first surface (52) of the counterweight block (5), the second surface (53) being arranged obliquely above the mounting frame, and the included angle between the second surface (53) and the first surface (52) being 130 degrees.

6. The device for testing the elongation of the enameled wire after aging according to claim 1, characterized in that: A screw rod (3) is provided between the connecting block (2) and the counterweight block (5); a first end of the screw rod (3) is inserted into the connecting block (2) and is threadedly connected to the connecting block (2); a second end of the screw rod (3) passes through the counterweight block (5) and protrudes from a side wall of the counterweight block (5); and the screw rod (3) is threadedly connected to the counterweight block (5).

7. The device for testing the elongation of the enameled wire after aging according to claim 6, characterized in that: An adjustment block (4) is provided between the connecting block (2) and the counterweight block (5); the adjustment block (4) is threadedly connected to the screw rod (3); and the adjustment block (4) abuts against the bottom of the connecting block (2).

8. The device for testing the elongation of the enameled wire after aging according to claim 1, characterized in that: The mounting frame comprises a positioning rod (6) and a mounting plate (7), wherein the positioning rod (6) passes through the counterweight (5), the positioning rod (6) is fixedly connected to the counterweight (5), the mounting plate (7) is sleeved on the positioning rod (6) and fixedly connected to the positioning rod (6), and a distance is left between the mounting plate (7) and the counterweight (5); The first clamping plate (81) and the second clamping plate (82) are both arranged between the mounting plate (7) and the counterweight block (5); the first clamping plate (81) is connected to the counterweight block (5); the second clamping plate (82) is sleeved on the positioning rod (6) and is slidably connected to the positioning rod (6); the adjusting rod (83) passes through the mounting plate (7) and is threadedly connected to the mounting plate (7).

9. The device for testing the elongation of the enameled wire after aging according to claim 8, characterized in that: The adjusting rod (83) is in contact with the second clamping plate (82), and one end of the adjusting rod (83) close to the second clamping plate (82) is hemispherical.

10. The device for testing the elongation of the enameled wire film after aging according to claim 9, characterized in that: A spring (61) is sleeved on the positioning rod (6), and the spring (61) is sleeved between the first clamping plate (81) and the second clamping plate (82). The first end of the spring (61) is connected to the first clamping plate (81), and the second end is connected to the second clamping plate (82), so as to realize automatic resetting of the second clamping plate (82).

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