A narrow-edge bending test device for enameled flat wire

Abstract

The present application relates to the technical fields of cable testing, and discloses a narrow-edge bending test device for enameled flat wire, which comprises a test table, two coaxial rotating plates are rotatably connected to the upper end of the test table, a plurality of U-shaped channels are fixedly connected to the upper end of the two rotating plates respectively and staggered, a straight channel is fixedly connected to the upper end of the rear rotating plate, a stop block one is arranged in the inner cavity of the U-shaped channel and slidably connected to the upper end of the rotating plate, a stop block two is arranged on the left side of the left straight channel and slidably connected to the upper end of the rear rotating plate, the stop block one and the stop block two can extrude the enameled flat wire, a bending plate is slidably connected to the upper wall of the rotating plate and arranged on the inner side of the middle part of the U-shaped channel, and a anti-disengagement assembly is arranged on the bending plate and used for limiting the upper end of the enameled flat wire. The present application can simultaneously and automatically conduct precise bending test detection on multiple regions of a section of enameled flat wire, improve the detection efficiency and effect, and facilitate the evaluation of the overall performance of the paint film of the same enameled wire.

Description

Technical Field

[0001] This invention relates to the field of cable testing technology, and specifically to a narrow-side bending test device for enameled flat wire. Background Technology

[0002] Enamelled flat wire is widely used in electronics, electrical appliances, motors, network communications, new energy and other fields because it meets the design requirements of electronic and motor products with lower height, smaller volume, lighter weight and higher power density. The flexibility of the enamel film of enamelled flat wire is an important indicator for measuring the comprehensive performance of enamelled flat wire. During the winding of enamelled flat wire into various shapes, the enamel film will be subjected to a certain degree of stretching and bending. The flexibility of the enamel film directly affects whether the enamel film will crack during the flat wire forming process.

[0003] The invention patent with publication number CN110595912B discloses a narrow-side bending test device and a method for testing the narrow-side bending of enameled wire. The narrow-side bending test device is used to bend the enameled wire along its narrow side. The enameled wire includes a movable section, a section to be rotated, and a section to be bent that connects the movable section and the section to be rotated. The narrow-side bending test device includes a base, a first receiving groove formed on the base for closely fitting the wide side of the movable section and abutting the narrow side of the movable section, a first fixed shaft fixedly inserted on the base, a first rotating member rotatably sleeved on the first fixed shaft for rotating around the first fixed shaft, and a second receiving groove formed on the first rotating member for closely fitting the wide side of the section to be rotated and abutting the narrow side and end face of the section to be rotated. When the first rotating member rotates around the first fixed shaft, it drives the section to be rotated around the first fixed shaft and bends the section to be bent around the first fixed shaft.

[0004] The narrow-edge bending test device for enameled wire in the aforementioned patent requires manual control of the pressure plate to fix one end of the enameled flat wire and control of the rotating part to bend the other end of the enameled flat wire during the test. The bending accuracy is low, the automation is poor, and it can only bend a single area of ​​a section of enameled flat wire at a time. When the test volume is large, multiple test installations and tests of the enameled wire are required, resulting in poor test effect, low efficiency, and difficulty in evaluating the overall performance of the enamel film of the same enameled wire. Summary of the Invention

[0005] The purpose of this invention is to address the problems of poor automation, low testing efficiency, poor testing results, and difficulty in evaluating the overall performance of the enamel film of the same enameled wire in general enameled wire narrow-side bending test devices. This invention provides an enameled flat wire narrow-side bending test device.

[0006] To achieve the above objectives, the present invention specifically adopts the following technical solution:

[0007] A narrow-side bending test device for enameled flat wire includes a test platform. Two coaxial rotating plates are rotatably connected to the upper end of the test platform. Several intersecting U-shaped channels are fixedly connected to the upper ends of the two rotating plates respectively. Straight channels are fixedly connected to both sides of the upper end of the rear rotating plate. A first abutment block is provided in the inner cavity of the U-shaped channel and slidably engaged with the upper end of the rotating plate. A second abutment block is provided on the left side of the left straight channel and slidably engaged with the upper end of the rear rotating plate. Both the first and second abutments can compress the enameled flat wire. A curved plate is provided on the inner side of the middle of the U-shaped channel and slidably connected to the upper wall of the rotating plate. An anti-detachment component for limiting the upper end of the enameled flat wire is provided on the curved plate.

[0008] The test bench is slidably connected to a spring support plate in the middle. The top of the spring support plate is fixedly connected to several linearly arrayed sliding shafts. The first and second abutments are rotatably sleeved on the corresponding sliding shafts. The inner cavity of the test bench is provided with a drive assembly that first drives the spring support plate to move to the right, and then drives the two rotating plates to deflect upward.

[0009] Furthermore, the right wall of the U-shaped channel cavity has an opening 1 that matches the first abutment, and the left wall of the straight channel on the left side has an opening 2 that matches the second abutment.

[0010] Furthermore, the straight channels on both sides are respectively opposite to the openings of the corresponding U-shaped channels on the front side, and the openings of the U-shaped channels on the front and rear sides are opposite to each other, forming a serpentine shape when the straight channels on both sides are combined with the U-shaped channels on the front and rear sides.

[0011] Furthermore, the abutment block 1 has a through groove in the middle, and the upper part of the rotating plate on both the front and rear sides has a toothed groove. An L-shaped pin is slidably connected in the toothed groove and is slidably engaged with the through groove. The end of the L-shaped pin away from the abutment block 1 is fixedly connected to the bottom of the bent plate. The middle part of the U-shaped channel on both the front and rear sides has a notch corresponding to the bent plate.

[0012] Furthermore, the anti-detachment component includes a toothed post rotatably connected between the inner wall of the middle part of the bent plate and the L-shaped pin. The toothed post is engaged with the toothed groove. A stop bar is fixedly connected to the top of the toothed post. The height of the bent plate is lower than the height of the U-shaped channel and is adapted to the width of the enameled flat wire. The stop bar is slidably connected to the upper end of the bent plate.

[0013] Furthermore, the sliding shaft is coaxial with the rotating plate, the right edge of the sliding shaft is rounded, and both ends of the sliding shaft are offset from the top of the U-shaped channel and the straight channel opening.

[0014] Furthermore, the driving assembly includes a sliding frame fixedly connected to the inner wall of the test bench, a spring slider that is slidably engaged in the middle of the sliding frame and elastically connected to the spring support plate, the spring force of the spring slider being greater than the spring force of the spring support plate, and a telescopic cylinder fixedly connected between the spring slider and the inner wall of the sliding frame.

[0015] The upper wall of the test platform is provided with a slot that matches the elastic support plate, and the elastic support plate is elastically connected to the left wall of the inner cavity of the test platform.

[0016] Furthermore, the drive assembly also includes a U-shaped guide frame that is slidably engaged with the inner wall of the test bench. Two hinge rods are movably connected between the front and rear sides of the upper end of the U-shaped guide frame and the corresponding rotating plate. A guide groove is provided in the middle of the U-shaped guide frame. The elastic slider is fixedly connected with pins that are slidably engaged with the guide grooves at both the front and rear ends.

[0017] Furthermore, the guide groove is composed of straight guide grooves and inclined guide grooves connected and combined from left to right.

[0018] The beneficial effects of this invention are as follows:

[0019] 1. This invention involves placing a section of enameled flat wire in a serpentine pattern through straight channels and various U-shaped channels. The control drive component first drives the elastic support plate to move each sliding shaft to the upper end of the enameled flat wire. Simultaneously, the sliding shaft drives the first and second pairs of abutment blocks near the bending area of ​​the enameled flat wire to be relatively and alternately squeezed and fixed, so as to ensure that the bending of each section does not affect each other. With the cooperation of the drive component, two rotating plates are driven to deflect upward, thereby realizing the automated and precise bending test detection of multiple areas of a section of enameled flat wire at the same time, improving the detection efficiency and effect, and facilitating the evaluation of the overall performance of the enamel film of the same enameled wire.

[0020] 2. This invention controls the bending plate to move synchronously towards one side of the abutment when the pair of abutment blocks are pressed and fixed. This avoids the situation where both ends of the enameled flat wire are fixed when it bends, which would cause the test results to deviate from the true performance. Furthermore, the bending plate moves and drives the anti-detachment component to limit the upper end of the curved part of the enameled flat wire. This prevents the enameled flat wire in the U-shaped channel from tilting outwards and deviating when the two rotating plates are deflected to a vertical state, thus affecting the true bending stress performance and improving the accuracy of the test. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention. Figure 1 ;

[0022] Figure 2 This is a schematic diagram of the overall three-dimensional structure of the present invention. Figure 2 ;

[0023] Figure 3 This is a three-dimensional sectional view of the test platform and elastic support plate of the present invention;

[0024] Figure 4 This is a three-dimensional sectional view of the test platform and rotating plate of the present invention;

[0025] Figure 5 This is an exploded view of the elastic support plate and U-shaped guide frame of the present invention;

[0026] Figure 6 This is an exploded three-dimensional sectional view of the L-shaped pin and the rotating plate portion of the present invention;

[0027] Figure 7 This is a front view of the elastic support plate and rotating plate portion of the present invention;

[0028] Figure 8 This is a left view of the rotating plate and sliding shaft portion of the experimental device of the present invention in the deflection state.

[0029] Reference numerals in the attached diagram: 1. Test bench; 2. Rotating plate; 21. U-shaped channel; 22. Straight channel; 3. Block 1; 31. Oblique through channel; 32. Block 2; 4. L-shaped pin; 41. Bend plate; 42. Toothed column; 43. Stop bar; 5. Elastic support plate; 51. Sliding shaft; 6. Sliding frame; 61. Elastic slider; 62. Pin; 63. Telescopic cylinder; 7. U-shaped guide frame; 71. Hinge rod; 72. Guide groove. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0031] Example 1, as Figures 1-8 As shown, a narrow-side bending test device for enameled flat wire includes a test platform 1. Two coaxial rotating plates 2 are rotatably connected to the upper end of the test platform 1. Several intersecting U-shaped channels 21 are fixedly connected to the upper ends of the two rotating plates 2 respectively. Straight channels 22 are fixedly connected to both sides of the upper end of the rear rotating plate 2. A first abutment 3 is provided in the inner cavity of the U-shaped channel 21 and is slidably engaged with the upper end of the rotating plate 2. A second abutment 32 is provided on the left side of the left straight channel 22 and is slidably engaged with the upper end of the rear rotating plate 2. Both the first abutment 3 and the second abutment 32 can compress the enameled flat wire. A bent plate 41 is provided on the inner side of the middle part of the U-shaped channel 21 and is slidably connected to the upper wall of the rotating plate 2. An anti-detachment component for limiting the upper end of the enameled flat wire is provided on the bent plate 41.

[0032] A spring support plate 5 is slidably connected to the middle of the test bench 1. Several linear arrays of sliding shafts 51 are fixedly connected to the top of the spring support plate 5. The sliding shafts 51 are coaxial with the rotating plate 2. The right edge of the sliding shaft 51 is rounded. Both ends of the sliding shaft 51 are offset from the top of the U-shaped channel 21 and the straight channel 22. The first abutment block 3 and the second abutment block 32 are rotatably sleeved on the corresponding sliding shafts 51. The inner cavity of the test bench 1 is equipped with a drive assembly that first drives the spring support plate 5 to move to the right, and then drives the two rotating plates 2 to deflect upward.

[0033] The right wall of the inner cavity of the U-shaped channel 21 has an opening 1 that is adapted to the first abutment block 3, and the left wall of the straight channel 22 on the left side has an opening 2 that is adapted to the second abutment block 32.

[0034] The straight channels 22 on both sides are opposite to the openings of the corresponding U-shaped channels 21 on the front side, and the openings of the U-shaped channels 21 on both the front and rear sides are opposite to each other. The straight channels 22 on both sides and the U-shaped channels 21 on both the front and rear sides are combined to form a serpentine shape.

[0035] During the experiment, a long section of enameled flat wire was cut and inserted into the straight channel 22 on one side, passing through each U-shaped channel 21 before extending into the straight channel 22 on the other side. The control drive assembly first moved the elastic support plate 5 to the right, which in turn moved each sliding shaft 51 to the right and to the upper end of the enameled flat wire. Simultaneously, the sliding shafts 51 moved the first abutment 3 and the second abutment 32 to press and fix the part of the enameled flat wire near the bending area. Since the U-shaped channels 21 at the upper ends of the two rotating plates 2 are staggered, the first abutment 3 also intersects. Incorrect. Correspondingly, because the second abutment 32 is located to the left of the left straight channel 22, the fixing areas for the enameled flat wire are relatively staggered. The bending of each section of the enameled flat wire does not affect the others. During the compression fixing process, the bending plate 41 automatically moves to the side of the first abutment 3, thereby eliminating the fixing effect caused by the friction of the inner wall of the U-shaped channel 21 and the side wall of the bending plate 41 when the enameled flat wire is initially placed in the U-shaped channel 21, which was caused by tension. This achieves relative freedom on the opposite side of the fixed end of the enameled flat wire, avoiding subsequent bending of the enameled flat wire. With both ends fixed, the deformable area of ​​the enameled flat wire after bending is strictly limited, and the stress is highly concentrated at a certain point between the two fixed ends. This makes it impossible to simulate the stress state of progressive bending around the mold in standard testing, resulting in unexpected paint film cracking and ultimately causing the test results to deviate from the true performance. In addition, when the bending plate 41 moves, the anti-detachment component is automatically driven to limit the upper end of the curved part of the enameled flat wire in the U-shaped channel 21, thereby preventing the enameled flat wire in the U-shaped channel 21 from tilting outwards when the two rotating plates 2 are deflected upwards to a vertical state. This affects the actual bending stress performance and improves the accuracy of the test. The subsequent drive component drives the two rotating plates 2 to deflect upwards by 90 degrees to the vertical. Since the sliding shaft 51 and the rotating plate 2 are coaxial, the abutment 3, which is rotated and sleeved on the sliding shaft 51, remains fixed. The enameled flat wire can be bent in multiple areas around each sliding shaft 51, thereby realizing the automated and precise bending test of multiple areas of a section of enameled flat wire at the same time, improving the test efficiency and effect, and facilitating the evaluation of the overall performance of the enamel film of the same enameled wire.

[0036] Example 2: Based on the above examples, an adjustment mechanism for the bending plate 41 is provided:

[0037] The abutment block 3 has a through groove 31 in the middle, and the upper ends of the rotating plates 2 on both the front and rear sides are provided with toothed grooves. An L-shaped pin 4 is slidably connected in the toothed groove and is slidably engaged with the through groove 31. The end of the L-shaped pin 4 away from the abutment block 3 is fixedly connected to the bottom of the bent plate 41. The middle of the U-shaped channel 21 on both the front and rear sides has a notch corresponding to the bent plate 41.

[0038] When the stop block 3 moves to the right, the oblique through groove 31 is driven to squeeze the L-shaped pin 4, thereby causing the L-shaped pin 4 to move the bent plate 41 toward the side of the stop block 3. This eliminates the fixing effect caused by the friction of the inner wall of the U-shaped channel 21 and the side wall of the bent plate 41 when the enameled flat wire is initially placed in the U-shaped channel 21 and is stretched. This achieves relative freedom on the opposite side of the fixed end of the enameled flat wire, avoiding deviation of the test results from the true performance.

[0039] In embodiment three, based on the above embodiments, the anti-detachment component includes a toothed post 42 rotatably connected between the inner wall of the middle part of the bent plate 41 and the L-shaped pin 4. The toothed post 42 is meshed with the toothed groove. A stop bar 43 is fixedly connected to the top of the toothed post 42. The height of the bent plate 41 is lower than the height of the U-shaped channel 21 and is adapted to the width of the enameled flat wire. The stop bar 43 is slidably connected to the upper end of the bent plate 41.

[0040] When the outer end of the initial stop bar 43 is above the bending plate 41 and does not block the area above the U-shaped channel 21, when the L-shaped pin 4 moves toward the side of the abutment block 3, the toothed column 42 is driven to engage the tooth groove and deflect. The stop bar 43 is thus deflected to the area above the U-shaped channel 21 to block and limit the enameled flat wire, so as to prevent the enameled flat wire in the U-shaped channel 21 from tilting outward and deflecting when the two rotating plates 2 are deflected to the vertical state, which would affect the actual bending force performance.

[0041] In embodiment four, based on the above embodiments, the driving component includes a sliding frame 6 fixedly connected to the inner wall of the test bench 1. A spring slider 61, which is elastically connected to the spring support plate 5, is slidably engaged in the middle of the sliding frame 6. The elastic force of the spring slider 61 is greater than the elastic force of the spring support plate 5. A telescopic cylinder 63 is fixedly connected between the spring slider 61 and the inner wall of the sliding frame 6.

[0042] The upper wall of the test bench 1 is provided with a slot that is compatible with the elastic support plate 5, and the elastic support plate 5 is elastically connected to the left wall of the inner cavity of the test bench 1.

[0043] The telescopic cylinder 63 retracts, causing the elastic slider 61 to move to the right. Since the elastic force of the elastic slider 61 is greater than that of the elastic support plate 5, the elastic slider 61 and the elastic support plate 5 are initially fixedly connected. The elastic slider 61 then drives the elastic support plate 5 along the slot, causing the sliding shaft 51 to move to the right, so as to shift the sliding shaft 51 to the area for bending and guiding the enameled flat wire. At the same time, it realizes the segmented and staggered fixing and limiting of the enameled flat wire.

[0044] In Example 5, based on the above examples, the drive assembly further includes a U-shaped guide frame 7 that is slidably engaged with the inner wall of the test bench 1. Two hinge rods 71 ​​are movably connected between the front and rear sides of the upper end of the U-shaped guide frame 7 and the corresponding rotating plate 2. A guide groove 72 is provided through the middle of the U-shaped guide frame 7. The front and rear ends of the elastic slider 61 are fixedly connected with pins 62 that are slidably engaged with the guide grooves 72.

[0045] The guide groove 72 is composed of straight guide grooves and inclined guide grooves connected together from left to right.

[0046] When the telescopic cylinder 63 retracts, it causes the elastic slider 61 to move to the right. When the elastic slider 61 moves the elastic support plate 5 along the slot to the maximum distance, the sliding shaft 51 just reaches the designated bending guide area for the enameled flat wire. The enameled flat wire is then fixed and limited in different areas. Correspondingly, the elastic slider 61 drives the pin 62 to slide and engage with the inclined guide groove from the straight guide groove in the guide groove 72. As the telescopic cylinder 63 continues to retract, the elastic support plate 5 is restricted by the slot and cannot move further. The elastic slider 61 is automatically compressed, and the elastic slider 61 drives the pin 62 to squeeze the inclined guide groove, thereby causing the U-shaped guide frame 7 to move upward. The hinge rod 71 then squeezes the rotating plates 2 on both sides to deflect to a vertical position, so as to use each sliding shaft 51 to perform multi-area bending detection of the enameled flat wire.

[0047] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A narrow edge bending test device for enameled flat wire, comprising a test table (1), characterized in that, The test bench (1) upper end rotationally connected with two coaxial rotating plates (2), two rotating plates (2) upper end are fixedly connected with staggered U-shaped channel (21), rear rotating plate (2) upper end both sides are fixedly connected with straight channel (22), the U-shaped channel (21) inner chamber is provided with the resistance block one (3) of sliding joint with rotating plate (2) upper end, left straight channel (22) left side is provided with the resistance block two (32) of sliding joint with rear rotating plate (2) upper end, the resistance block one (3) and resistance block two (32) can be pressed to enameled flat wire, the U-shaped channel (21) middle inside is provided with the bending plate (41) of sliding connection with rotating plate (2) upper wall, the bending plate (41) is provided with the anti-drop assembly of the upper end of enameled flat wire limiting on the U-shaped channel (21) middle inside. The test bench (1) middle sliding joint has elastic support plate (5), the elastic support plate (5) top is fixedly connected with linear array of a plurality of slide shafts (51), the resistance block one (3), resistance block two (32) are rotationally sleeved on corresponding slide shaft (51), the test bench (1) inner chamber is provided with drive assembly, first drive elastic support plate (5) right shift, then drive two rotating plates (2) upward deflection. The drive assembly includes a sliding frame (6) fixedly connected to the inner wall of the test bench (1), a resilient sliding block (61) elastically connected to the elastic support plate (5) is slidingly connected to the middle of the sliding frame (6), the elastic force of the resilient sliding block (61) is greater than the elastic force of the elastic support plate (5), and a telescopic cylinder (63) is fixedly connected between the resilient sliding block (61) and the inner wall of the sliding frame (6). The drive assembly further includes a U-shaped guide frame (7) slidingly connected to the inner wall of the test bench (1), two hinge rods (71) are movably connected between the front and rear sides of the upper end of the U-shaped guide frame (7) and the corresponding rotating plate (2), a guide groove (72) is provided in the middle of the U-shaped guide frame (7), the guide groove (72) is composed of a straight guide groove and an inclined guide groove, and the front and rear ends of the resilient sliding block (61) are fixedly connected with pin columns (62) slidingly connected with the guide groove (72).

2. The narrow edge bending test device for a varnished flat wire according to claim 1, wherein The right wall of the U-shaped channel (21) has a first opening matched with the resistance block one (3), and the left wall of the left straight channel (22) has a second opening matched with the resistance block two (32).

3. The narrow edge bending test device for enameled flat wire according to claim 2, characterized in that, The straight channels (22) on both sides are respectively opposite to the corresponding U-shaped channels (21) on the front side, and the U-shaped channels (21) on the front and rear sides are opposite to each other, and the straight channels (22) on both sides and the U-shaped channels (21) on the front and rear sides are combined in a serpentine shape.

4. The narrow edge bending test device for enameled flat wire according to claim 3, characterized in that The resistance block one (3) has a diagonal through groove (31) in the middle, the upper end of the rotating plate (2) on the front and rear sides is provided with a gear slot, and the L-shaped pin bar (4) is slidingly connected in the gear slot and slidingly connected with the diagonal through groove (31), one end of the L-shaped pin bar (4) away from the resistance block one (3) is fixedly connected with the bottom of the bending plate (41), and the middle of the U-shaped channel (21) on the front and rear sides has a notch corresponding to the bending plate (41).

5. The narrow edge bending test device for enameled flat wire according to claim 4, characterized in that, The anti-off component comprises a tooth column (42) rotationally connected between the inner wall of the middle part of the bent plate (41) and the L-shaped pin strip (4), the tooth column (42) is in meshing connection with a tooth groove, the top of the tooth column (42) is fixedly connected with a blocking strip (43), the height of the bent plate (41) is lower than the height of the U-shaped channel (21) and is adapted to the width of the enameled flat wire, and the blocking strip (43) is slidingly connected to the upper end of the bent plate (41).

6. The narrow edge bending test device for enameled flat wire according to claim 5, characterized in that The sliding shaft (51) is coaxial with the rotating plate (2), the right end edge of the sliding shaft (51) is chamfered, and the two ends of the sliding shaft (51) are offset above the U-shaped channel (21) and the straight channel (22).

7. The narrow edge bending test device for enameled flat wire according to claim 6, characterized in that The upper wall of the test bench (1) is provided with a clamping groove matched with the elastic supporting plate (5), and the elastic supporting plate (5) is elastically connected with the left wall of the inner cavity of the test bench (1).

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