Train wheelset magnetic particle flaw detector

Abstract

The utility model provides a train wheelset magnetic particle flaw detector, including frame, install the support platform, the godet assembly, electrode clamping mechanism, big coil movement mechanism, small coil movement mechanism and spray mechanism on frame, godet assembly and electrode clamping mechanism install on support platform, godet assembly is used for carrying and driving wheelset rotation, electrode clamping mechanism, its installation godet assembly's top and can be opposite wheelset displacement, be used for clamping and loosening wheelset, big coil movement mechanism and small coil movement mechanism are separately arranged at both ends of wheelset, spray mechanism, it includes the first linear guide rail of installation frame, the door type support of sliding setting first linear guide rail, install spray support on door type support and can along door type support longitudinal displacement, and install a plurality of spray pipes on spray support and face wheelset arrangement. The utility model can cover wheelset full circumference surface and full axial length, and detects no dead angle.

Description

Technical Field

[0001] This utility model belongs to the field of magnetic particle inspection technology, specifically relating to a magnetic particle inspection machine for train wheelsets. Background Technology

[0002] With the rapid development of railway construction, railway transportation has become an important mode of transportation. The safe operation of the transportation vehicle, namely the train, plays a crucial role in ensuring the normal operation of the railway. Among them, the wheelset, as a major component of the train's running gear, is a critical link affecting its safe operation. Therefore, it is necessary to conduct flaw detection on the wheelsets to determine whether there are defects such as wear, thereby providing data support for maintaining the wheelsets to a good technical condition.

[0003] However, existing wheelset flaw detectors have the following shortcomings in the flaw detection process: 1. Existing flaw detectors are only equipped with a single coil moving mechanism, which limits their ability to detect flaws in wheelsets of various specifications; 2. The two sides of the wheel are stress concentration areas, which are prone to fatigue cracks and other defects. Moreover, the shape of this area is relatively complex, and conventional direct-fire nozzles cannot fully cover the wheelet surface, affecting the subsequent flaw detection effect. Those skilled in the art urgently need to solve the above technical problems. Utility Model Content

[0004] To address the aforementioned shortcomings of existing technologies, this utility model provides a magnetic particle inspection machine for train wheelsets. The machine is designed with a roller assembly to drive the wheelset rotation, and in conjunction with an electrode clamping mechanism, a coil moving mechanism, and a spraying mechanism, it can cover the entire circumference and axial length of the wheelset, ensuring no blind spots in the inspection.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A magnetic particle inspection machine for train wheelsets includes a frame, a support platform mounted on the frame, a roller assembly, an electrode clamping mechanism, a large coil moving mechanism, a small coil moving mechanism, and a spraying mechanism.

[0007] in,

[0008] The idler roller assembly and the electrode clamping mechanism are mounted on the support platform, and the idler roller assembly is used to support and drive the wheelset to rotate;

[0009] An electrode clamping mechanism, which is mounted above the idler roller assembly and is movable relative to the wheelset, is used to clamp and release the wheelset;

[0010] The large coil moving mechanism and the small coil moving mechanism are respectively located at both ends of the wheelset, and both can be inserted into the wheelset and move along the length direction of the wheelset;

[0011] The spraying mechanism includes a first linear guide rail mounted on the frame, a portal frame slidably mounted on the first linear guide rail, a spraying bracket mounted on the portal frame and capable of longitudinal displacement along the portal frame, and a plurality of spraying pipes mounted on the spraying bracket and arranged facing the wheelset.

[0012] In a preferred embodiment of the present invention, a plurality of nozzles are provided along the length of the spray pipe, wherein the nozzles on the spray pipe near the wheel are arranged at an angle to the two sides of the wheel.

[0013] In a preferred embodiment of the present invention, a first cylinder is installed on the frame to drive the gantry bracket to move along the first linear guide rail, and a second cylinder is installed on the gantry bracket to drive the spray bracket to rise and fall.

[0014] In a preferred embodiment of this utility model, two support platforms are arranged opposite each other on the frame. Each support platform is equipped with a roller assembly, which includes two roller bodies, two roller shafts and a roller shaft drive component. Bearing seats are installed at both ends of the roller shaft. The roller shaft is sleeved on the bearing seats. One end of the roller shaft is connected to the roller body and the other end is connected to the roller shaft drive component. A wheelset is installed between the two roller bodies.

[0015] In a preferred embodiment of the present invention, the electrode clamping mechanism includes an electrode seat mounted on a support platform, a sliding seat mounted on the electrode seat, a second cylinder mounted inside the electrode seat, and an electrode chuck mounted on the sliding seat and connected to the output end of the second cylinder.

[0016] In a preferred embodiment of this utility model, a second linear guide rail is installed on the frame, and both the large coil moving mechanism and the small coil moving mechanism are slidably mounted on the second linear guide rail.

[0017] In a preferred embodiment of the present invention, the large coil moving mechanism includes a first movable seat slidably mounted on a second linear guide rail, a first drive motor mounted on the first movable seat, a first roller connected to the output end of the first drive motor, the first roller mounted on the second linear guide rail, and a large coil with a circular cross-section mounted on the first movable seat.

[0018] In a preferred embodiment of the present invention, the small coil moving mechanism includes a second movable seat slidably mounted on a second linear guide rail, a second drive motor mounted on the second movable seat, a second roller connected to the output end of the second drive motor, the second roller mounted on the second linear guide rail, and a small coil with a circular cross-section mounted on the second movable seat.

[0019] In a preferred embodiment of this utility model, a liquid collection plate is installed at the bottom of the frame, baffles are installed at both ends of the liquid collection plate, a water pump is connected to the liquid collection plate, and the other end of the water pump is connected to the spray pipe to form a magnetic suspension liquid circulation spray.

[0020] Beneficial effects:

[0021] This utility model discloses a magnetic particle flaw detector for train wheelsets. The wheelset to be inspected is placed on a roller assembly, which drives the wheelset to rotate around its own axis. The electrode clamping mechanism is displaced relative to the wheelset and clamps the wheelset. Current is applied to the wheelset through the electrodes, causing the wheelset to generate a circumferential magnetic field.

[0022] The large coil moving mechanism and the small coil moving mechanism can be autonomously adapted according to the specifications of the wheelset. During the specific flaw detection operation, the large coil moving mechanism or the small coil moving mechanism enters from one end of the wheelset and moves along the length of the wheelset to generate a longitudinal magnetic field. The circumferential magnetic field and the longitudinal magnetic field form a composite magnetization, which can cover defects in different directions on and near the surface of the wheelset.

[0023] The above-mentioned spraying mechanism works synchronously. The gantry bracket moves along the first linear guide rail to position the spray pipe directly above the wheelset. The spray bracket adjusts the distance between itself and the wheelset longitudinally along the gantry bracket to form a full magnetic suspension liquid coverage of the wheelset. The nozzles of the spray pipes near the wheels are designed to be tilted towards the two sides of the wheels. The tilt angle design allows the magnetic suspension liquid to act directly on the side of the wheels. With the rotation of the wheelset, the magnetic suspension liquid sprayed from the tilted nozzles can flow along the side of the wheels and evenly cover the entire side.

[0024] After the flaw detection is completed, the idler roller assembly continues to drive the wheelset to rotate, and the operator visually inspects the defects on the wheelset surface;

[0025] This utility model is designed with a roller assembly to drive the wheelset to rotate. Combined with the electrode clamping mechanism, coil moving mechanism and spraying mechanism, it can cover the entire circumference and axial length of the wheelset, ensuring no blind spots in the inspection. The displacement adjustment capabilities of the two specifications of the coil moving mechanism and the spraying mechanism 7 can adapt to the inspection of multiple specifications of wheelsets. The magnetic suspension is evenly adhered, and the magnetic traces are clear, reducing missed detections or misjudgments and ensuring the accuracy of the inspection. Attached Figure Description

[0026] Figure 1 A schematic diagram of the structure of a train wheelset magnetic particle flaw detector provided by this utility model;

[0027] Figure 2 A front view of a train wheelset magnetic particle flaw detector provided by this utility model;

[0028] Figure 3 This is a schematic diagram of the spraying mechanism described in this utility model;

[0029] Figure 4 This is a schematic diagram of the installation structure of the support platform, roller assembly and electrode clamping mechanism described in this utility model;

[0030] Figure 5 This is a schematic diagram of the installation structure of the large and small coil moving mechanism and the frame described in this utility model.

[0031] In the diagram: 1 rack;

[0032] 2. Supporting platform;

[0033] 3. Idler roller assembly, 31. Roller body, 32. Roller shaft, 33. Roller shaft drive unit, 34. Bearing housing;

[0034] 4. Electrode clamping mechanism, 41. Electrode seat, 42. Sliding seat, 43. Second cylinder, 44. Electrode chuck;

[0035] 5. Large coil moving mechanism, 51. First moving seat, 52. First drive motor, 53. First roller, 54. Large coil;

[0036] 6. Small coil moving mechanism, 61. Second moving seat, 62. Second drive motor, 63. Second roller, 64. Small coil;

[0037] 7 Spraying mechanism, 71 First linear guide rail, 72 Gate-shaped bracket, 73 Spraying bracket, 74 Spraying pipe, 75 First cylinder, 76 Second cylinder;

[0038] 8 drip plates. Detailed Implementation

[0039] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0040] like Figure 1-2 As shown, this utility model provides a train wheelset magnetic particle flaw detector, including a frame 1, a support platform 2 mounted on the frame 1, a roller assembly 3, an electrode clamping mechanism 4, a large coil moving mechanism 5, a small coil moving mechanism 6, and a spraying mechanism 7.

[0041] in,

[0042] The aforementioned roller assembly 3 and electrode clamping mechanism 4 are mounted on the support platform 2. The roller assembly 3 is used to support and drive the wheelset to rotate.

[0043] Electrode clamping mechanism 4, which is mounted above roller assembly 3 and can be displaced relative to the wheelset, is used to clamp and release the wheelset;

[0044] The large coil moving mechanism 5 and the small coil moving mechanism 6 are respectively located at both ends of the wheelset, and both can be inserted into the wheelset and move along the length of the wheelset.

[0045] The spraying mechanism 7 includes a first linear guide rail 71 mounted on the frame 1, a portal bracket 72 slidably mounted on the first linear guide rail 71, a spraying bracket 73 mounted on the portal bracket 72 and capable of longitudinal displacement along the portal bracket 72, and a plurality of spraying pipes 74 mounted on the spraying bracket 73 and arranged facing the wheelset.

[0046] The working principle and beneficial effects of the above embodiments are as follows:

[0047] The present invention relates to a magnetic particle flaw detector for train wheelsets. The wheelset to be inspected is placed on a roller assembly 3, which drives the wheelset to rotate around its own axis. The electrode clamping mechanism 4 is displaced relative to the wheelset and clamps the wheelset. Current is applied to the wheelset through the electrodes, so that the wheelset generates a circumferential magnetic field.

[0048] The large coil moving mechanism 5 and the small coil moving mechanism 6 can be autonomously adapted according to the specifications of the wheelset. During the specific flaw detection operation, the large coil moving mechanism 5 or the small coil moving mechanism 6 enters from one end of the wheelset and moves along the length of the wheelset to generate a longitudinal magnetic field. The circumferential magnetic field and the longitudinal magnetic field form a composite magnetization, which can cover defects in different directions on and near the surface of the wheelset.

[0049] The above-mentioned spraying mechanism 7 works synchronously. The gantry bracket 71 moves along the first linear guide rail 71 so that the spray pipe 74 is located directly above the wheelset. The spraying bracket 73 adjusts the distance between itself and the wheelset along the longitudinal direction of the gantry bracket 71 to ensure that the spray pipe 74 sprays magnetic suspension liquid evenly onto the surface of the wheelset.

[0050] After the flaw detection is completed, the idler roller assembly 3 continues to drive the wheelset to rotate, and the operator visually inspects the defects on the wheelset surface;

[0051] This utility model designs a roller assembly 3 to drive the wheel set to rotate. In conjunction with the electrode clamping mechanism 4, the coil moving mechanism, and the spraying mechanism 7, it can cover the entire circumference and axial length of the wheel set, ensuring no blind spots in the inspection. The displacement adjustment capabilities of the two specifications of the coil moving mechanism and the spraying mechanism 7 can adapt to the inspection of multiple wheel sets. The magnetic suspension adheres evenly, and the magnetic traces are clear, reducing missed detections or misjudgments and ensuring inspection accuracy.

[0052] In one embodiment,

[0053] For example Figure 2 As shown, a plurality of nozzles are provided along the length of the spray pipe 74, wherein the nozzles on the spray pipe 74 near the wheel are arranged at an angle to the two sides of the wheel.

[0054] The spray pipe 74 nozzle of this utility model is designed to be inclined towards the two sides of the wheel to avoid forming a spray blind zone at the connection between the wheel side and the axle. The inclined angle design allows the magnetic suspension liquid to act directly on the side of the wheel. With the rotation of the wheelset, the magnetic suspension liquid sprayed by the inclined nozzle can flow along the side of the wheel and evenly cover the entire side.

[0055] In one embodiment,

[0056] A first cylinder 75 is installed on the frame 1 to drive the gantry bracket 72 to move along the first linear guide rail 71, and a second cylinder 76 is installed on the gantry bracket 72 to drive the spray bracket 73 to rise and fall.

[0057] The first cylinder 75 extends and retracts through its piston rod, causing the portal bracket 72 to slide smoothly along the first linear guide rail 71. Its core function is to place the spray pipe 74 directly above the wheelset, forming a complete magnetic suspension liquid coverage of the wheelset. At the same time, after the flaw detection is completed, the first cylinder 75 drives the spray pipe 74 to move to one side, so that the spray mechanism 7 is completely removed from the area above the wheelset, without affecting the subsequent loading and unloading of the wheelset.

[0058] The second cylinder 76 is mounted on the gantry bracket 72. Through the extension and retraction of its piston rod, it drives the spray bracket 73 to move longitudinally along the gantry bracket 72, adjusting the distance between the spray pipe 74 and the wheel set surface to ensure that the nozzle and the wheel set surface maintain the optimal distance and ensure that the magnetic suspension fluid is evenly attached.

[0059] In one embodiment,

[0060] like Figure 4 As shown, there are two support platforms 2 arranged opposite each other on the frame 1. Each support platform 2 is equipped with a roller assembly 3, which includes two roller bodies 31, two roller shafts 32 and a roller shaft drive component 33. Both ends of the roller shaft 32 are equipped with bearing seats 34. The roller shaft 32 is sleeved on the bearing seats 34. One end of the roller shaft 32 is connected to the roller body 31 and the other end is connected to the roller shaft drive component 33. The wheelset is installed between the two roller bodies 31.

[0061] Two support platforms 2 are arranged opposite each other on the frame 1, corresponding to the two ends of the wheelset respectively. The axle of the wheelset is mounted between two rollers 31. The surface of the rollers 31 is made of wear-resistant rubber with anti-slip texture to avoid scratching the surface of the axle. The roller drive 33 is configured as a geared motor that works with chain drive to drive the roller 32 to rotate. Then, the friction between the rollers 31 and the axle drives the entire wheelset to rotate around its own axis.

[0062] In one embodiment,

[0063] For example Figure 4As shown, the electrode clamping mechanism 4 includes an electrode seat 41 mounted on the support platform 2, a sliding seat 42 mounted on the electrode seat 41, a second cylinder 43 mounted inside the electrode seat 41, and an electrode chuck 44 mounted on the sliding seat 42 and connected to the output end of the second cylinder 43.

[0064] After the wheelset is placed on the idler assembly 3, the second cylinder 43 drives the sliding seat 42 to move the electrode chuck 44 toward the wheelset until the electrode chuck 44 clamps both ends of the wheelset; the electrode chuck 44 conducts current through an external power supply, and the current flows along the circumference of the wheelset, causing the wheelset to generate a circumferential magnetic field.

[0065] In one embodiment,

[0066] A second linear guide rail is installed on the frame 1, and the large coil moving mechanism 5 and the small coil moving mechanism 6 are both slidably installed on the second linear guide rail.

[0067] At least two second linear guides are arranged side by side on the frame 1. The second linear guides serve as the guiding reference for the coil moving mechanism, providing it with a stable sliding trajectory.

[0068] In one embodiment,

[0069] like Figure 5 As shown, the large coil moving mechanism 5 includes a first moving seat 51 slidably mounted on a second linear guide rail, a first drive motor 52 mounted on the first moving seat 51, a first roller 53 connected to the output end of the first drive motor 52, the first roller 53 mounted on the second linear guide rail, and a large coil 54 mounted on the first moving seat 51, the large coil 54 having a circular cross-section.

[0070] The first movable seat 51 serves as a support frame. One end of it is mounted on the second linear guide rail via a slider, and the other end is equipped with a first drive motor 52. The output end of the first drive motor 52 is connected to a first roller 53. The first roller 53 contacts the second linear guide rail. The output end of the first drive motor 52 drives the first roller 53 to roll along the second linear guide rail, thereby driving the first movable seat 51 to move smoothly along the second linear guide rail.

[0071] The large coil 54 is mounted on the first movable seat 51. It has a circular cross-section and a hollow interior. The adapter wheels pass through it. The coil is connected to an external power source through a wire. When it is magnetized, it generates an axial magnetic field.

[0072] The first drive motor 52 drives the first moving seat 51 to move along the second linear guide rail through the first roller 53, which drives the large coil 54 to move smoothly from one end of the wheelset to the other end. During the movement, it can continuously magnetize the entire axial length of the wheelset, ensuring that a stable leakage magnetic field is generated at the longitudinal defect and there is no magnetization dead angle.

[0073] In one embodiment,

[0074] For example Figure 5 As shown, the small coil moving mechanism 6 includes a second moving seat 61 slidably mounted on a second linear guide rail. A second drive motor 62 is mounted on the second moving seat 61. The output end of the second drive motor 62 is connected to a second roller 63, which is mounted on the second linear guide rail. A small coil 64 is mounted on the second moving seat 61. The small coil 64 has a circular cross-section, and its structural design is the same as that of the large coil moving mechanism 6.

[0075] In one embodiment,

[0076] A liquid collection plate 8 is installed at the bottom of the frame 1. Baffles are installed at both ends of the liquid collection plate 8. A water pump is connected to the liquid collection plate 8. The other end of the water pump is connected to the spray pipe 74 to form a magnetic suspension liquid circulation spray.

[0077] The liquid collection plate 8 is installed at the bottom of the frame 1 and is designed to be inclined or concave to facilitate the collection of magnetic suspension liquid. It is used to collect the magnetic suspension liquid dripping from the wheel surface after spraying.

[0078] Baffles are installed at both ends of the liquid collection plate 8 to form a barrier structure, preventing the magnetic suspension liquid from overflowing from the edge of the liquid collection plate 8, thus avoiding waste or pollution of the equipment environment;

[0079] The liquid collection plate 8 is connected to the water pump inlet through a pipeline, and the water pump outlet is connected to the spray pipe 74, forming a closed-loop pipeline for spray recycling and reuse.

[0080] In summary:

[0081] This utility model discloses a magnetic particle flaw detector for train wheelsets. The wheelset to be inspected is placed on a roller assembly, which drives the wheelset to rotate around its own axis. The electrode clamping mechanism is displaced relative to the wheelset and clamps the wheelset. Current is applied to the wheelset through the electrodes, causing the wheelset to generate a circumferential magnetic field.

[0082] The large coil moving mechanism and the small coil moving mechanism can be autonomously adapted according to the specifications of the wheelset. During the specific flaw detection operation, the large coil moving mechanism or the small coil moving mechanism enters from one end of the wheelset and moves along the length of the wheelset to generate a longitudinal magnetic field. The circumferential magnetic field and the longitudinal magnetic field form a composite magnetization, which can cover defects in different directions on and near the surface of the wheelset.

[0083] The above-mentioned spraying mechanism works synchronously. The gantry bracket moves along the first linear guide rail to position the spray pipe directly above the wheelset. The spraying bracket adjusts the distance between itself and the wheelset longitudinally along the gantry bracket to ensure that the spray pipe sprays magnetic suspension liquid evenly onto the surface of the wheelset.

[0084] After the flaw detection is completed, the idler roller assembly continues to drive the wheelset to rotate, and the operator visually inspects the defects on the wheelset surface;

[0085] This utility model is designed with a roller assembly to drive the wheelset to rotate. Combined with the electrode clamping mechanism, coil moving mechanism and spraying mechanism, it can cover the entire circumference and axial length of the wheelset, ensuring no blind spots in the inspection. The displacement adjustment capabilities of the two specifications of the coil moving mechanism and the spraying mechanism 7 can adapt to the inspection of multiple specifications of wheelsets. The magnetic suspension is evenly adhered, and the magnetic traces are clear, reducing missed detections or misjudgments and ensuring the accuracy of the inspection.

[0086] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. The terms "front," "back," "left," and "right" used in the text are not specific and are mainly for more intuitive illustration of the technical solution, and do not constitute a limitation. Those skilled in the art should understand that the above embodiments are only for illustrating the technical concept and features of this utility model, and their purpose is to enable those skilled in the art to understand the content of this utility model and implement it. They should not be used to limit the scope of protection of this utility model. All equivalent changes or modifications made according to the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A magnetic particle inspection machine for train wheelsets, characterized in that: It includes a frame (1), a support platform (2) mounted on the frame (1), a roller assembly (3), an electrode clamping mechanism (4), a large coil moving mechanism (5), a small coil moving mechanism (6), and a spraying mechanism (7); in, The roller assembly (3) and the electrode clamping mechanism (4) are mounted on the support platform (2). The roller assembly (3) is used to carry and drive the wheelset to rotate. An electrode clamping mechanism (4) is mounted above the roller assembly (3) and is movable relative to the wheelset for clamping and releasing the wheelset; The large coil moving mechanism (5) and the small coil moving mechanism (6) are respectively located at both ends of the wheelset, and both can be inserted into the wheelset and move along the length direction of the wheelset; The spraying mechanism (7) includes a first linear guide rail (71) mounted on the frame (1), a portal frame (72) slidably mounted on the first linear guide rail (71), a spraying bracket (73) mounted on the portal frame (72) and capable of longitudinal displacement along the portal frame (72), and a plurality of spraying pipes (74) mounted on the spraying bracket (73) and arranged facing the wheelset.

2. The magnetic particle inspection machine for train wheelsets according to claim 1, characterized in that: A plurality of nozzles are provided along the length of the spray pipe (74), wherein the nozzles on the spray pipe (74) near the wheel are arranged at an angle to the two sides of the wheel.

3. The magnetic particle inspection machine for train wheelsets according to claim 1, characterized in that: A first cylinder (75) is installed on the frame (1) to drive the gantry bracket (72) to move along the first linear guide rail (71), and a second cylinder is installed on the gantry bracket (72) to drive the spray bracket (73) to rise and fall.

4. A magnetic particle inspection machine for train wheelsets according to claim 1, characterized in that: Two support platforms (2) are arranged opposite each other on the frame (1). Each support platform (2) is equipped with a roller assembly (3), which includes two roller bodies (31), two roller shafts (32) and a roller shaft drive (33). Both ends of the roller shaft (32) are equipped with bearing seats (34). The roller shaft (32) is sleeved on the bearing seats (34). One end of the roller shaft (32) is connected to the roller body (31) and the other end is connected to the roller shaft drive (33). The wheelset is installed between the two roller bodies (31).

5. A magnetic particle inspection machine for train wheelsets according to claim 1, characterized in that: The electrode clamping mechanism (4) includes an electrode seat (41) mounted on a support platform (2), a sliding seat (42) mounted on the electrode seat (41), a second cylinder (43) mounted inside the electrode seat (41), and an electrode chuck (44) mounted on the sliding seat (42) and connected to the output end of the second cylinder (43).

6. A magnetic particle inspection machine for train wheelsets according to claim 1, characterized in that: A second linear guide rail is installed on the frame (1), and the large coil moving mechanism (5) and the small coil moving mechanism (6) are both slidably installed on the second linear guide rail.

7. A magnetic particle inspection machine for train wheelsets according to claim 6, characterized in that: The large coil moving mechanism (5) includes a first moving seat (51) slidably mounted on a second linear guide rail. A first drive motor (52) is mounted on the first moving seat (51). The output end of the first drive motor (52) is connected to a first roller (53). The first roller (53) is mounted on the second linear guide rail. A large coil (54) is mounted on the first moving seat (51). The large coil (54) has a circular cross-section.

8. A magnetic particle inspection machine for train wheelsets according to claim 6, characterized in that: The small coil moving mechanism (6) includes a second moving seat (61) slidably mounted on a second linear guide rail. A second drive motor (62) is mounted on the second moving seat (61). The output end of the second drive motor (62) is connected to a second roller (63). The second roller (63) is mounted on the second linear guide rail. A small coil (64) is mounted on the second moving seat (61). The small coil (64) has a circular cross-section.

9. A magnetic particle inspection machine for train wheelsets according to claim 1, characterized in that: A liquid collection plate (8) is installed at the bottom of the frame (1), baffles are installed at both ends of the liquid collection plate (8), a water pump is connected to the liquid collection plate (8), and the other end of the water pump is connected to the spray pipe (74) to form a magnetic suspension liquid circulation spray.

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