Magnetic material test bed and use method thereof

Abstract

The invention belongs to the technical field of test equipment, and discloses a magnetic material test bed and a use method thereof.The magnetic material test bed comprises a base, a supporting seat is fixedly connected to the top of the base, switching type contact parts are symmetrically arranged on the two sides of the top of the supporting seat, and a pushing control part is fixedly connected to the base; and the push control parts are in one-to-one correspondence with the switching type contact parts. According to the invention, the switching type contact part and the push control part are utilized, in the actual test process, the downward swinging contact of different contact ends in the switching type contact part is realized through pushing, external connection wires are matched, the positions of the terminals are ensured to be determined and are not disordered, and positive and negative terminals are determined on the symmetrical swinging plates at the two sides; and different item tests can be rapidly switched by pushing the control part, so that the actual test operation is simple and convenient, multiple items of tests can be rapidly switched, and the test efficiency is greatly improved.

Description

Technical Field

[0001] The invention belongs to the technical field of test equipment, and in particular relates to a magnetic material test bench and a use method thereof. Background Art

[0002] A magnetic material test bench is a device used to test and analyze the performance of magnetic materials. It is mainly used to measure the magnetic permeability, magnetic saturation, coercive force, residual magnetic induction intensity and other physical properties of magnetic materials. Magnetic material test benches are widely used in research, production and quality control, especially in the development of electromagnetics, magnetic materials and sensors.

[0003] The existing magnetic material test bench maintains the stability of the magnetic material by positioning it during the test of rectangular magnetic materials, and cooperates with various test mechanisms to perform test operations. In addition, when performing tests such as hysteresis loop tests and magnetometer (VSM) tests, the magnetic material needs to be contacted. However, different terminal blocks are tangled with each other, making it difficult to select the test end. In particular, when performing multiple test operations, repeated sorting and selection are required, resulting in poor performance. Summary of the Invention

[0004] The object of the present invention is to provide a magnetic material test bench and a method of using the same to solve the problems raised in the above background technology.

[0005] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a magnetic material test bench and a method for using the same, comprising a base, the top of the base is fixedly connected to a support base, and switchable contact parts are symmetrically provided on both sides of the top of the support base, a push control part is fixedly connected to the base, and the push control part corresponds one-to-one to the switchable contact part, and the switchable contact part comprises a fixed shaft, a swing plate and a torsion spring, the swing plate is rotatably mounted on the fixed shaft, and the torsion spring is connected to the side of the swing plate, the push control part controls the rotation of the swing plate on the fixed shaft, one end of the swing plate is sleeved with a contact end, and the bottom of the swing plate is provided with a guide slope.

[0006] Preferably, the support seat includes a seat body, a through hole and a connecting cavity, the seat body is fixed on the top of the base, the through hole is opened on the top of the seat body, the connecting cavity is opened inside the seat body, and the connecting cavity is connected to the through hole.

[0007] Preferably, a negative pressure control part is provided inside the seat body, and the negative pressure control part includes a push plate, a piston plate, a connecting rod and a spring. The piston plate is movably sleeved in the connecting cavity, and the connecting rod is movably sleeved on the front of the seat body. The connecting rod is fixed between the push plate and the piston plate, one end of the spring is fixedly connected to the piston plate, and the other end of the spring is fixed in the connecting cavity. The top of the seat body has a locking bolt, and the connecting rod is locked when the locking screw is turned down.

[0008] Preferably, the switching contact part also includes a vertical plate and a positioning ring, the fixed shaft is fixedly sleeved in the vertical plate, the positioning ring is fixedly sleeved on the outside of the fixed shaft and supports the torsion spring, and the push control part pushes the push plate in the negative pressure control part when it moves backward, and the push control part includes an electric push rod, a mounting frame and a protruding block, the electric push rod is fixed to the base through a bracket, the mounting frame is fixedly connected to the movable end of the electric push rod, the protruding block is fixed on the mounting frame, and the protruding block protrudes upward.

[0009] Preferably, a compressed air outlet is fixedly provided on the top of the base, and the compressed air outlet corresponds one-to-one to the pushing control part. A connecting purge part is provided between the two compressed air outlet parts, and the air outlet end of the connecting purge part is directed toward the top of the support seat. The air in the compressed air outlet can also be compressed and ejected during the forward movement of the pushing control part.

[0010] Preferably, the compressed air outlet part includes a fixed frame, an elastic airbag and a connecting plate. The fixed frame is fixed to the top of the base through a bottom connecting block. The elastic airbag is sleeved in the fixed frame, and one end of the elastic airbag is fixed in the fixed frame. The other end of the elastic airbag is fixedly connected to the connecting plate, and the connecting plate is movably sleeved in the fixed frame.

[0011] Preferably, the connecting and purge part includes a connecting frame and a connecting curved pipe, the connecting frame is fixed on the fixed frame, and the connecting frame is connected to the elastic airbag, the connecting curved pipe is fixed and connected to the top of the connecting frame, the connecting curved pipes are distributed in an array, and the outlet directions of each connecting curved pipe are different from each other.

[0012] A method for using a magnetic material test bench includes the following steps:

[0013] Step 1: Place the rectangular magnetic material block to be tested on the top surface of the support base, start the push control unit, move the push control unit backward, and push the negative pressure control unit to move, so that negative pressure is formed inside the support base and the magnetic material placed on the top is adsorbed and fixed. Manually rotate the locking bolt to stabilize the negative pressure control unit.

[0014] Step 2: After the fixation process, according to the actual test data, the two sets of push control parts are activated again, so that the two sets of push control parts move forward at the same time, and push the symmetrically distributed swing plates in the switchable contact part to swing, so that the corresponding contact ends contact the top of the magnetic material, and cooperate with the external wiring on the swing plates to realize the test of the corresponding project;

[0015] Step 3: After completing one set of tests, continue to start the push control unit, replace another set of swing plates with the push control unit and perform swing control under push, and then carry out the power connection test of the next set of items, and complete each power connection test in sequence;

[0016] Step 4: After completing the power-on test, continue to push the control unit to move, push the control unit to move and squeeze the compressed air outlet, compress the air in the compressed air outlet and blow it toward the magnetic material through the connected purge unit, and cool the magnetic material after the power-on test, so that the control unit pushes the compressed air outlet back and forth to complete the reciprocating purge and cooling.

[0017] The beneficial effects of the present invention are as follows:

[0018] (1) The present invention utilizes a switchable contact part and a push control part. During the actual test process, the different contact ends in the switchable contact part are pushed to achieve the downward swing and collision. In conjunction with the external wiring, the position of each terminal is determined and there is no confusion. The swing plates symmetrical on both sides are determined as each other's positive and negative terminals, and after synchronously swinging down, they collide with the top of the magnetic material. In conjunction with power-on, the power connection test is completed. In addition, different project tests can be quickly switched by pushing the control part. The actual test operation is simple and convenient, and multiple tests can be quickly switched, which greatly improves the test efficiency.

[0019] (2) The present invention utilizes the pushing control part again in conjunction with the support seat and the negative pressure control part. When the pushing control part moves in the opposite direction, the negative pressure control part can be pushed to operate, and a local negative pressure is formed inside the support seat. By utilizing the effect of the local negative pressure, the magnetic material placed on the top is fixed on the support seat through the pressure difference between the upper and lower surfaces, and the fixing process is quickly achieved, avoiding the test equipment caused by deviation and shaking during the test, further improving the stability of the test, and the actual fixing operation is simple and convenient.

[0020] (3) The present invention reuses the pushing control part, cooperates with the compressed air outlet part and the connecting purge part, and realizes the compressed ejection of the air inside the compressed air outlet part when moving forward further. The compressed ejected flow airflow is used to purge and cool the magnetic material after the power-on test to avoid overheating. Before the test process, the compressed air outlet part can be pushed back and forth, and the connecting purge part can be cooperated to blow and clean the top of the support seat before the test to avoid solid particles affecting the stable placement of the magnetic material. At the same time, the outer side of the magnetic material before the test is blown and cleaned. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the present invention;

[0022] Figure 2 It is a cross-sectional schematic diagram of the present invention;

[0023] Figure 3 is a schematic cross-sectional view of the support base of the present invention;

[0024] Figure 4 is a schematic diagram of a switchable contact portion of the present invention;

[0025] Figure 5 A schematic diagram of a propulsion control unit of the present invention;

[0026] Figure 6 This is a schematic diagram of the connection between the compressed air outlet portion and the connecting purge portion of the present invention;

[0027] Figure 7 This is a schematic diagram of the explosion of the compressed air outlet portion of the present invention;

[0028] Figure 8 Schematic diagram of the negative pressure control unit of the present invention.

[0029] In the figure: 1. base; 2. support seat; 21. seat body; 22. through hole; 23. connecting cavity; 3. switchable contact part; 31. vertical plate; 32. fixed shaft; 33. swing plate; 34. positioning ring; 35. torsion spring; 4. push control part; 41. electric push rod; 42. mounting frame; 43. raised block; 5. compressed air outlet part; 51. fixed frame; 52. elastic airbag; 53. connecting plate; 6. connecting purge part; 61. connecting frame; 62. connecting curved pipe; 7. negative pressure control part; 71. push plate; 72. piston plate; 73. connecting rod; 74. spring. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] like Figures 1 to 8 As shown, an embodiment of the present invention provides a magnetic material test bench and a method for using the same, including a base 1, a support base 2 is fixedly connected to the top of the base 1, and switchable contact parts 3 are symmetrically provided on both sides of the top of the support base 2. A push control part 4 is fixedly connected to the base 1, and the push control part 4 corresponds one-to-one to the switchable contact part 3. The switchable contact part 3 includes a fixed shaft 32, a swing plate 33 and a torsion spring 35. The swing plate 33 is rotatably mounted on the fixed shaft 32, and the torsion spring 35 is connected to the side of the swing plate 33. The push control part 4 controls the rotation of the swing plate 33 on the fixed shaft 32. A contact end is sleeved on one end of the swing plate 33, and a guiding inclined surface is provided at the bottom of the swing plate 33.

[0032] Example 1: Place the rectangular magnetic material block to be tested on the top surface of the support seat 2, and seal all the through holes 22 on the top of the seat body 21, start the push control part 4, the electric push rod 41 drives the mounting bracket 42 and the protruding block 43 to move, and causes the mounting bracket 42 in the push control part 4 to move backward, and the mounting bracket 42 moves and pushes the push plate 71 in the negative pressure control part 7, so that the push plate 71 drives the piston plate 72 to move in the connecting cavity 23 through the connecting rod 73, expands the volume of the internal connection area with the through hole 22, so that a local negative pressure is formed inside the support seat 2, and the magnetic material placed on the top is adsorbed and fixed under the action of the negative pressure, and the locking bolt is manually rotated to lock. Tighten the bolts to clamp the connecting rod 73 to complete the stabilization of the negative pressure control part 7. After the fixation process, according to the actual test data, start the two sets of push control parts 4 again, so that the protrusions 43 in the two sets of push control parts 4 move forward at the same time, and push the symmetrically distributed swing plates 33 in the switchable contact part 3 to swing, so that the corresponding contact ends swing and contact the top of the magnetic material, and cooperate with the external wiring on the swing plate 33 to realize the test of the corresponding project; after completing one set of tests, continue to start the push control part 4, push the control part 4 to replace another set of swing plates 33 and perform swing control under push, and carry out the power-on test of the next set of projects, and complete various power-on tests in sequence.

[0033] First, by utilizing the switchable contact part 3 and the pushing control part 4, during the actual test process, the different contact ends in the switchable contact part 3 are pushed to achieve the downward swing and collision, and the external wiring is coordinated to ensure that the position of each terminal is determined and not confused. The swing plates 33 symmetrical on both sides are determined as each other's positive and negative terminals, and after synchronously swinging down, they collide with the top of the magnetic material, and the power-on test is completed by powering on. Different project tests can be quickly switched by pushing the control part 4. The actual test operation is simple and convenient, and multiple tests can be quickly switched, which greatly improves the test efficiency.

[0034] In addition, by reusing the push control part 4, cooperating with the support seat 2 and the negative pressure control part 7, when the push control part 4 is moved in the opposite direction, the negative pressure control part 7 can be pushed to operate, and a local negative pressure can be formed inside the support seat 2. By utilizing the effect of the local negative pressure, the magnetic material placed on the top is fixed on the support seat 2 through the air pressure difference between the upper and lower surfaces, and the fixing process is quickly realized, avoiding the test equipment caused by displacement and shaking during the test, further improving the stability of the test, and the actual fixing operation is simple and convenient.

[0035] Example 2: After completing the power-on test, continue to keep pushing the control part 4 to move, push the control part 4 to move and squeeze the connecting plate 53 in the compressed air outlet part 5, so that the connecting plate 53 compresses the elastic airbag 52 along the fixed frame 51, so that the air in the elastic airbag 52 is compressed into the connecting purge part 6, and the compressed air in the connecting purge part 6 is blown out through the connecting frame 61 and the connecting curved pipe 62, and blown toward the outside of the magnetic material, so as to cool the magnetic material after the power-on test, so that the push control part 4 pushes the compressed air outlet part 5 back and forth to complete the reciprocating purge and cooling.

[0036] First, by utilizing the pushing control part 4 again, cooperating with the compressed air outlet part 5 and the connecting purge part 6, the compressed air inside the compressed air outlet part 5 is ejected when moving forward further, and the compressed air flow is used to purge and cool the magnetic material after the power-on test to avoid overheating. Before the test, the compressed air outlet part 5 can be pushed back and forth, and the connecting purge part 6 can be used to purge and clean the top of the support seat 2 before the test to avoid solid particles affecting the stable placement of the magnetic material. At the same time, the outer side of the magnetic material before the test is purged and cleaned.

[0037] Among them, the support seat 2 includes a seat body 21, a through hole 22 and a connecting cavity 23. The seat body 21 is fixed on the top of the base 1, the through hole 22 is opened on the top of the seat body 21, the connecting cavity 23 is opened inside the seat body 21, and the connecting cavity 23 is connected to the through hole 22.

[0038] The support seat 2 supports and places the magnetic material, and cooperates with the magnetic material to block and seal the through hole 22 to achieve the closure of the connecting cavity 23, providing a basis for the subsequent establishment of negative pressure.

[0039] Among them, a negative pressure control part 7 is provided inside the seat body 21, and the negative pressure control part 7 includes a push plate 71, a piston plate 72, a connecting rod 73 and a spring 74. The piston plate 72 is movably sleeved in the connecting cavity 23, and the connecting rod 73 is movably sleeved on the front of the seat body 21. The connecting rod 73 is fixed between the push plate 71 and the piston plate 72. One end of the spring 74 is fixedly connected to the piston plate 72, and the other end of the spring 74 is fixed in the connecting cavity 23. All the locking bolts on the top of the seat body 21 lock the connecting rod 73 when the locking screw is turned down.

[0040] The negative pressure control part 7 moves in the communication cavity 23 through the piston plate 72, expands the communication area of ​​the communication cavity 23 connected to the through hole 22, reduces the pressure, and forms a pressure difference between the upper and lower surfaces of the magnetic material to complete the fixation.

[0041] Among them, the switching contact part also includes a vertical plate 31 and a positioning ring 34, the fixed shaft 32 is fixedly sleeved in the vertical plate 31, the positioning ring 34 is fixedly sleeved on the outside of the fixed shaft 32 and supports the torsion spring 35, and pushes the push plate 71 in the negative pressure control part 7 when the push control part 4 moves backward. The push control part 4 includes an electric push rod 41, a mounting frame 42 and a protruding block 43. The electric push rod 41 is fixed on the base 1 through a bracket, the mounting frame 42 is fixedly connected to the movable end of the electric push rod 41, the protruding block 43 is fixed on the mounting frame 42, and the protruding block 43 protrudes upward.

[0042] By utilizing the protruding block 43 in the pushing control part 4 to intermittently push each group of swing plates 33 during movement, and the protruding block 43 itself presses the connecting plate 53 when it advances to the specified position, and at the same time pushes the push plate 71 when the mounting frame 42 moves backward in the opposite direction.

[0043] Among them, a compressed air outlet part 5 is fixedly provided on the top of the base 1, and the compressed air outlet part 5 corresponds one-to-one to the pushing control part 4. A connecting purge part 6 is provided between the two compressed air outlet parts 5, and the air outlet end of the connecting purge part 6 is facing above the support seat 2. During the forward movement of the pushing control part 4, the air in the compressed air outlet part 5 can also be compressed and ejected.

[0044] The compressed air outlet part 5 and the connected purge part 6 cooperate to purge the air flow, thereby completing cooling and cleaning.

[0045] Among them, the compressed air outlet part 5 includes a fixed frame 51, an elastic airbag 52 and a connecting plate 53. The fixed frame 51 is fixed to the top of the base 1 through a bottom connecting block. The elastic airbag 52 is sleeved in the fixed frame 51, and one end of the elastic airbag 52 is fixed in the fixed frame 51. The other end of the elastic airbag 52 is fixedly connected to the connecting plate 53. The connecting plate 53 is movably sleeved in the fixed frame 51. The connecting purge part 6 includes a connecting frame 61 and a connecting curved pipe 62. The connecting frame 61 is fixed on the fixed frame 51, and the connecting frame 61 is connected to the elastic airbag 52. The connecting curved pipe 62 is fixedly connected to the top of the connecting frame 61. The connecting curved pipes 62 are distributed in an array, and the outlet directions of each connecting curved pipe 62 are different from each other.

[0046] The elastic airbag 52 is compressed repeatedly to eject air, and inhales air when elastically resetting. Each group of connecting curved pipes 62 facing different directions can respectively achieve the purge of the outer side of the magnetic material and the top of the support seat 2 to complete cleaning and cooling.

[0047] A method for using a magnetic material test bench includes the following steps:

[0048] Step 1: Place the rectangular magnetic material block to be tested on the top surface of the support base 2, start the push control unit 4, push the control unit 4 to move backward, and push the negative pressure control unit 7 to move, so that negative pressure is formed inside the support base 2, and the magnetic material placed on the top is adsorbed and fixed. Manually rotate the locking bolt to complete the stabilization of the negative pressure control unit 7;

[0049] Step 2: After the fixing process, according to the actual test data, the two sets of push control parts 4 are activated again, so that the two sets of push control parts 4 move forward at the same time, and push the symmetrically distributed swing plates 33 in the switchable contact part 3 to swing, so that the corresponding contact ends contact the top of the magnetic material, and cooperate with the external wiring on the swing plates 33 to realize the test of the corresponding project;

[0050] Step 3: After completing one set of tests, continue to start the push control unit 4, push the control unit 4 to replace another set of swing plates 33 and perform swing control under push, and then carry out the power connection test of the next set of items, and complete each power connection test in sequence;

[0051] Step 4: After completing the power-on test, continue to push the control part 4 to move and squeeze the compressed air outlet part 5, compress the air in the compressed air outlet part 5 and blow it toward the magnetic material through the connected purge part 6, and cool the magnetic material after the power-on test, so that the control part 4 pushes the compressed air outlet part 5 back and forth to complete the reciprocating purge and cooling.

[0052] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A magnetic material test bench, comprising a base (1), characterized in that: The top of the base (1) is fixedly connected to a support base (2), and switchable contact parts (3) are symmetrically provided on both sides of the top of the support base (2). A push control part (4) is fixedly connected to the base (1), and the push control part (4) corresponds to the switchable contact part (3) one by one. The switchable contact part (3) includes a fixed shaft (32), a swing plate (33) and a torsion spring (35). The swing plate (33) is rotatably mounted on the fixed shaft (32), and the torsion spring (35) is connected to the side of the swing plate (33). The push control part (4) controls the rotation of the swing plate (33) on the fixed shaft (32). One end of the swing plate (33) is sleeved with a contact end, and the bottom of the swing plate (33) is provided with a guiding inclined surface.

2. A magnetic material test bench according to claim 1, characterized in that: The support seat (2) comprises a seat body (21), a through hole (22) and a communication cavity (23); the seat body (21) is fixed on the top of the base (1); the through hole (22) is provided on the top of the seat body (21); the communication cavity (23) is provided inside the seat body (21), and the communication cavity (23) is communicated with the through hole (22).

3. A magnetic material test bench according to claim 2, characterized in that: A negative pressure control unit (7) is provided inside the seat body (21), and the negative pressure control unit (7) includes a push plate (71), a piston plate (72), a connecting rod (73) and a spring (74). The piston plate (72) is movably sleeved in the connecting cavity (23), and the connecting rod (73) is movably sleeved on the front of the seat body (21). The connecting rod (73) is fixed between the push plate (71) and the piston plate (72). One end of the spring (74) is fixedly connected to the piston plate (72), and the other end of the spring (74) is fixed in the connecting cavity (23). All locking bolts are provided on the top of the seat body (21), and the connecting rod (73) is locked when the locking screw is turned downward.

4. A magnetic material test bench according to claim 3, characterized in that: The switchable contact part further comprises a vertical plate (31) and a positioning ring (34); the fixed shaft (32) is fixedly sleeved in the vertical plate (31); the positioning ring (34) is fixedly sleeved on the outside of the fixed shaft (32) and supports the torsion spring (35); the pushing control part (4) pushes the push plate (71) in the negative pressure control part (7) when moving backward; the pushing control part (4) comprises an electric push rod (41), a mounting frame (42) and a protruding block (43); the electric push rod (41) is fixed to the base (1) through a bracket; the mounting frame (42) is fixedly connected to the movable end of the electric push rod (41); the protruding block (43) is fixed on the mounting frame (42); and the protruding block (43) protrudes upward.

5. A magnetic material test bench according to claim 4, characterized in that: A compressed air outlet portion (5) is fixedly provided on the top of the base (1), and the compressed air outlet portion (5) corresponds to the push control portion (4) one by one. A connected purge portion (6) is provided between the two compressed air outlet portions (5), and the air outlet end of the connected purge portion (6) faces upward from the support base (2). When the push control portion (4) moves forward, the air in the compressed air outlet portion (5) can be compressed and ejected.

6. A magnetic material test bench according to claim 5, characterized in that: The compressed air outlet portion (5) comprises a fixed frame (51), an elastic airbag (52) and a connecting plate (53); the fixed frame (51) is fixed to the top of the base (1) via a bottom connecting block; the elastic airbag (52) is sleeved in the fixed frame (51); one end of the elastic airbag (52) is fixed in the fixed frame (51); the other end of the elastic airbag (52) is fixedly connected to the connecting plate (53); and the connecting plate (53) is movably sleeved in the fixed frame (51).

7. A magnetic material test bench according to claim 6, characterized in that: The communication and purge portion (6) comprises a communication frame (61) and a communication curved pipe (62). The communication frame (61) is fixed on the fixed frame (51), and the communication frame (61) is connected to the elastic airbag (52). The communication curved pipe (62) is fixed and connected to the top of the communication frame (61). The communication curved pipes (62) are distributed in an array, and the outlet directions of each communication curved pipe (62) are different from each other.

8. The method for using a magnetic material test bench according to claim 7, characterized in that: The following steps are included: The first step is to place the rectangular magnetic material block to be tested on the top surface of the support seat (2), start the push control part (4), push the control part (4) to move backward, and push the negative pressure control part (7) to move, so that negative pressure is formed inside the support seat (2), and the magnetic material placed on the top is adsorbed and fixed, and the locking bolt is manually rotated to complete the stabilization of the negative pressure control part (7); Step 2: After the fixing process, according to the actual test data, the two groups of push control parts (4) are started again, so that the two groups of push control parts (4) move forward at the same time, and push the swing plates (33) symmetrically distributed in the switchable contact part (3) to swing, so that the corresponding contact ends abut against the top of the magnetic material, and cooperate with the external wiring on the swing plates (33) to realize the test of the corresponding project; Step 3: After completing one set of tests, continue to start the push control unit (4), the push control unit (4) replaces another set of swing plates (33) and performs swing control under push, and then conducts the power connection test of the next set of items, and completes each power connection test in sequence; Step 4: After the power-on test is completed, the movement of the push control part (4) is continued, the push control part (4) moves and squeezes the compressed air outlet part (5), compresses the air in the compressed air outlet part (5) and blows it toward the magnetic material through the connected purge part (6), and performs a temperature reduction treatment on the magnetic material after the power-on test, so that the push control part (4) pushes the compressed air outlet part (5) back and forth, completing the reciprocating purge and cooling.

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