Double-station bearing ring fluorescent magnetic particle flaw detector

Abstract

The invention provides a double-station bearing ring fluorescent magnetic particle flaw detector which comprises a rack and further comprises a first magnetizing station and a second magnetizing station which are arranged on the rack in parallel. The carrier roller mechanism penetrates through the first magnetizing station and the second magnetizing station and is used for bearing a bearing ring; the first magnetizing station comprises a first closed-circuit magnet yoke and a first auxiliary carrier roller mechanism, the first auxiliary carrier roller mechanism is obliquely installed on the portion, above the first closed-circuit magnet yoke, of the rack, and the first auxiliary carrier roller mechanism and the carrier roller mechanism form a 90-degree angle; the second magnetizing station comprises a second closed-circuit magnet yoke, a fork-shaped coil and a second auxiliary carrier roller mechanism, the second auxiliary carrier roller mechanism is obliquely mounted on the rack above the second closed-circuit magnet yoke, and the second auxiliary carrier roller mechanism and the carrier roller mechanism form a 90-degree angle. Different magnetization schemes are designed for bearing rings of different specifications, various flaw detection requirements are met, the magnetization effect is good and uniform, no blind area exists, the utilization rate of the flaw detection machine is increased through double stations, non-contact operation is achieved, and safety and reliability are achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of flaw detection equipment, and particularly relates to a double-station bearing ring fluorescent magnetic particle flaw detector. Background Art

[0002] Before assembly, the bearing ring needs to be subjected to flaw detection to ensure the quality and safety of the later finished products.

[0003] The flaw detectors in the prior art have the following defects for the flaw detection of bearing rings: 1. A single flaw detector can only detect bearing rings of specific specifications and cannot achieve wide coverage. Bearing manufacturers need to configure multiple flaw detection devices to meet the flaw detection requirements of existing bearing rings, increasing the production cost of enterprises; 2. For the flaw detection of large-sized bearing rings, due to the particularity of their specifications, the flaw detection difficulty is further increased. However, the existing flaw detection equipment has a complex structure, occupies a large space, and for large-sized bearing rings, the flaw detection operation is relatively cumbersome. Those skilled in the art urgently need to solve the above technical problems. Summary of the Invention

[0004] In view of the above deficiencies of the prior art, the present invention provides a double-station bearing ring fluorescent magnetic particle flaw detector, which has a double-station operation, high flaw detection efficiency, and good quality.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A double-station bearing ring fluorescent magnetic particle flaw detector, including a frame, and further including a first magnetization station and a second magnetization station arranged side by side on the frame;

[0007] A roller mechanism, passing through the first magnetization station and the second magnetization station, for carrying the bearing ring;

[0008] Wherein,

[0009] The first magnetization station includes a first closed magnetic yoke and a first auxiliary roller mechanism, the first auxiliary roller mechanism is obliquely installed on the frame above the first closed magnetic yoke, and is perpendicular to the roller mechanism;

[0010] The first closed magnetic yoke is of an openable and closable type, including a first "U"-shaped magnetic yoke and a first "-" shaped magnetic yoke, the first "-" shaped magnetic yoke is fixed on the frame, the first "U"-shaped magnetic yoke is slidably installed on the frame, and a first cylinder for driving it to make an opening and closing movement relative to the first "-" shaped magnetic yoke is provided at its end;

[0011] The second magnetization station includes a second closed magnetic yoke, a fork-shaped coil and a second auxiliary roller mechanism, the second auxiliary roller mechanism is obliquely installed on the frame above the second closed magnetic yoke, and is perpendicular to the roller mechanism;

[0012] Both the second closed magnetic yoke and the fork-shaped coil are of an openable and closable type, and the second closed magnetic yoke and the fork-shaped coil are installed side by side on the frame;

[0013] The second closed magnetic yoke includes a second "U"-shaped magnetic yoke and a second "-"-shaped magnetic yoke. The second "-"-shaped magnetic yoke is fixed on the frame, and the second "U"-shaped magnetic yoke is slidably installed on the frame, and a second air cylinder for driving it to make an opening and closing movement relative to the second "-"-shaped magnetic yoke is provided at its end;

[0014] The fork-shaped coil includes a first "U"-shaped conductor and a second "U"-shaped conductor. The first "U"-shaped conductor is installed on the second "U"-shaped magnetic yoke, and the second "U"-shaped conductor is slidably installed on the frame, and a third air cylinder for driving it to make an opening and closing movement relative to the first "U"-shaped conductor is provided at its end.

[0015] In a preferred embodiment of the present invention, the idler mechanism is arranged at a certain angle to the horizontal plane, and includes an idler support installed on the frame, a driving roller, a first driven roller and a second driven roller installed side by side on the idler support. The driving roller and the first driven roller are used for the second magnetization position, and the first driven roller and the second driven roller are used for the first magnetization position;

[0016] The distance between the first driven roller and the driving roller is greater than the distance between the first driven roller and the second driven roller.

[0017] In a preferred embodiment of the present invention, the driving roller (22) is connected to the motor (25) through a chain drive, and chain drives are used between the driving roller, the first driven roller and the second driven roller;

[0018] The first "U"-shaped magnetic yoke (31) passes through between the first driven roller and the second driven roller, and the second "U"-shaped magnetic yoke passes through between the driving roller and the first driven roller.

[0019] In a preferred embodiment of the present invention, a liquid collecting tank is arranged at the lower part of the frame, and spray pipes are installed on both sides of the idler support and on the first "U"-shaped magnetic yoke and the second "U"-shaped magnetic yoke,

[0020] The liquid collecting tank is connected to a pump and a spray pipe through a conveying pipe to form a magnetic suspension liquid circulating spraying mechanism.

[0021] In a preferred embodiment of the present invention, the first auxiliary idler mechanism includes a first bearing seat installed on the frame, and a first auxiliary idler rotatably installed on the first bearing seat;

[0022] The second auxiliary idler mechanism includes a second bearing seat installed on the frame, and a second auxiliary idler rotatably installed on the second bearing seat;

[0023] Among them, the length of the second auxiliary idler is greater than that of the first auxiliary idler.

[0024] In a preferred embodiment of the present invention, the first closed magnetic yoke further includes a first linear guide rail. The first "U"-shaped magnetic yoke is slidably mounted on the first linear guide rail through a first slider, and the first "U"-shaped magnetic yoke is driven by the first air cylinder to move along the first linear guide rail;

[0025] The second closed magnetic yoke further includes a second linear guide rail. The second "U"-shaped magnetic yoke is slidably mounted on the second linear guide rail through a second slider, and the second "U"-shaped magnetic yoke is driven by the second air cylinder to move along the second linear guide rail.

[0026] In a preferred embodiment of the present invention, the flaw detector is further provided with a darkroom. The darkroom includes a frame body covered with a light-shielding plate, and sound-absorbing cotton is filled between the light-shielding plate and the frame body;

[0027] The frame body includes a fixed frame and a movable frame arranged on one side of the fixed frame. The movable frame is movably connected to the fixed frame through a guide rail, and a driving component for driving the movable frame to displace towards the fixed frame is fixedly connected to the fixed frame.

[0028] Beneficial effects: The double-station bearing ring fluorescent magnetic particle flaw detector of the present invention designs the first closed magnetic yoke to realize longitudinal magnetization flaw detection of small-sized bearing rings, and designs the second closed magnetic yoke and fork-shaped coil to realize composite magnetization flaw detection of large-sized bearing rings. The flaw detection effect is good, and both adopt an opening and closing structure, which is convenient for loading and unloading bearing rings and more flexible in operation;

[0029] For bearing rings of different specifications, different magnetization schemes are designed to meet diverse flaw detection requirements. The magnetization effect is good and uniform, there are no blind spots, the magnetic field distribution is uniform, the detection accuracy is high, the bearing rings are convenient to load and unload, it can adapt to batch flaw detection operations, the design of double stations improves the utilization rate of the flaw detector, belongs to non-contact operation, is easy to operate, and is safe and reliable.

[0030] Adopting PLC control, when magnetizing the bearing rings, it does not contact the workpiece, and the bearing rings are reliably supported, move smoothly, the magnetic suspension liquid is sprayed evenly, and the flaw detection effect is good. Description of the Drawings

[0031] Figure 1 It is a schematic structural diagram of a double-station bearing ring fluorescent magnetic particle flaw detector provided by the present invention;

[0032] Figure 2 It is a partial structural schematic diagram of a double-station bearing ring fluorescent magnetic particle flaw detector provided by the present invention;

[0033] Figure 3 It is a partial structural top view of a double-station bearing ring fluorescent magnetic particle flaw detector provided by the present invention;

[0034] Figure 4 Schematic diagram of the installation structure of the first closed magnetic yoke, the second closed magnetic yoke and the fork-shaped coil of the present invention;

[0035] Figure 5 Schematic diagram of the installation structure of the first auxiliary idler mechanism, the second auxiliary idler mechanism and the idler mechanism of the present invention.

[0036] In the figure: 1 frame;

[0037] 2 idler mechanism, 21 idler support, 22 drive roller, 23 first driven roller, 24 second driven roller, 25 motor;

[0038] 3 first closed magnetic yoke, 31 first "U"-shaped magnetic yoke, 32 first "-" shaped magnetic yoke, 33 first linear guide;

[0039] 4 first auxiliary idler mechanism, 41 first bearing block, 42 first auxiliary idler;

[0040] 5 second closed magnetic yoke, 51 second "U"-shaped magnetic yoke, 52 second "-" shaped magnetic yoke, 53 second linear guide;

[0041] 6 fork-shaped coil, 61 first "U"-shaped conductor, 62 second "U"-shaped conductor;

[0042] 7 second auxiliary idler mechanism, 71 second bearing block, 72 second auxiliary idler;

[0043] 8 liquid collecting tank;

[0044] 9 spray pipeline. Detailed implementation manners

[0045] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0046] As Figure 1-2 shown in FIGS. 4, a double-station bearing ring fluorescent magnetic particle flaw detector provided by the present invention includes a frame 1, and further includes a first magnetization station and a second magnetization station arranged in parallel on the frame 1;

[0047] An idler mechanism 2, passing through the first magnetization station and the second magnetization station, for carrying the bearing ring;

[0048] Among them,

[0049] The first magnetization station includes a first closed magnetic yoke 3 and a first auxiliary idler mechanism 4. The first auxiliary idler mechanism 4 is inclinedly installed on the frame 1 above the first closed magnetic yoke 3 and is at a 90° angle to the idler mechanism 2.

[0050] The first closed magnetic yoke 3 is of an openable and closable type and includes a first "U"-shaped magnetic yoke 31 and a first "-"-shaped magnetic yoke 32. The first "-"-shaped magnetic yoke 32 is fixed on the frame 1, and the first "U"-shaped magnetic yoke 31 is slidably installed on the frame 1. A first cylinder for driving it to make an opening and closing movement relative to the first "-"-shaped magnetic yoke 32 is provided at its end.

[0051] The second magnetization station includes a second closed magnetic yoke 5, a fork-shaped coil 6 and a second auxiliary idler mechanism 7. The second auxiliary idler mechanism 7 is inclinedly installed on the frame 1 above the second closed magnetic yoke 5 and is at a 90° angle to the idler mechanism 2.

[0052] Both the above-mentioned second closed magnetic yoke 5 and the fork-shaped coil 6 are of an openable and closable type, and the second closed magnetic yoke 5 and the fork-shaped coil 6 are installed side by side on the frame 1.

[0053] The second closed magnetic yoke 5 includes a second "U"-shaped magnetic yoke 51 and a second "-"-shaped magnetic yoke 52. The second "-"-shaped magnetic yoke 52 is fixed on the frame 1, and the second "U"-shaped magnetic yoke 51 is slidably installed on the frame 1. A second cylinder for driving it to make an opening and closing movement relative to the second "-"-shaped magnetic yoke 52 is provided at its end.

[0054] The fork-shaped coil 6 includes a first "U"-shaped conductor 61 and a second "U"-shaped conductor 62. The first "U"-shaped conductor 61 is installed on the second "U"-shaped magnetic yoke 51, and the second "U"-shaped conductor 62 is slidably installed on the frame 1. A third cylinder for driving it to make an opening and closing movement relative to the first "U"-shaped conductor 61 is provided at its end.

[0055] The working principle and beneficial effects of the above embodiments are as follows:

[0056] The flaw detector of the present invention is designed with two flaw detection stations. The first magnetization station is used for flaw detection operations of bearing rings with a diameter less than 600 mm, and the second magnetization station is used for flaw detection operations of bearing rings with a diameter greater than 600 mm.

[0057] The two flaw detection stations operate separately:

[0058] For the first magnetization station, the bearing ring is hoisted onto the idler mechanism 2 and leans against the first auxiliary idler mechanism 4. The idler mechanism 2 drives the bearing ring to rotate. The first "U"-shaped magnetic yoke 31 is driven by the first cylinder to pass through the center of the bearing ring and close with the first "-"-shaped magnetic yoke 32 to form a closed magnetic yoke for longitudinal magnetization to inspect cracks and minute defects on the surface of the bearing ring.

[0059] The second magnetization station: The bearing ring is hoisted onto the roller mechanism 2 and leans against the second auxiliary roller mechanism 7. The roller mechanism 2 drives the bearing ring to rotate. The second "U"-shaped magnetic yoke 51 is driven by the second cylinder to pass through the center of the bearing ring and close with the second "-" shaped magnetic yoke 52. While the second "U"-shaped magnetic yoke 51 moves, it drives the first "U"-shaped conductor 61 to pass through one side wall of the bearing ring. The second "U"-shaped conductor 62 is driven by the third cylinder to move towards the first "U"-shaped conductor 61 and contact it, and then the bearing ring is subjected to composite magnetization by energization, so as to obtain omnidirectional magnetization;

[0060] Design a set of closed magnetic yokes to pass through the center of the bearing ring to meet the flaw detection operation of small-diameter bearing rings. When the bearing ring rotates, a longitudinal magnetic field effect is generated on the bearing ring, and an opening and closing structure is designed to make the loading and unloading of the bearing ring more convenient and flexible;

[0061] Design a set of closed magnetic yokes and closed coils to meet the flaw detection operation of large-diameter bearing rings. When the bearing ring rotates, multi-directional magnetic field effects such as circumferential and longitudinal are generated simultaneously on the bearing ring, the magnetization effect is better and more uniform, there is no blind area, the magnetic field distribution is uniform, and the detection accuracy is high;

[0062] The present invention designs different magnetization schemes for bearing rings of different specifications to meet diverse flaw detection requirements. The bearing rings are convenient to load and unload, can adapt to batch flaw detection operations, and the design of double stations improves the utilization rate of the flaw detector.

[0063] In one embodiment, as Figure 3 shown

[0064] The roller mechanism 2 is arranged at a certain angle with the horizontal plane, and includes a roller support 21 installed on the frame 1, a driving roller 22, a first driven roller 23 and a second driven roller 24 arranged in parallel on the roller support 21. The driving roller 22 and the first driven roller 23 are used for the second magnetization station, and the first driven roller 23 and the second driven roller 24 are used for the first magnetization station;

[0065] The distance between the first driven roller 23 and the driving roller 22 is greater than the distance between the first driven roller 23 and the second driven roller 24;

[0066] The roller mechanism 2 is arranged at a certain angle with the horizontal plane, which helps to ensure the stability of the installation when the bearing ring is magnetized. The design of the roller spacing meets the flaw detection of bearing rings of different specifications and adapts to the requirements of different magnetization stations. At the same time, the reasonable shaft spacing can reduce the vibration and offset of the bearing ring during the flaw detection process, and improve the stability and safety of the flaw detection process.

[0067] In one embodiment,

[0068] The driving roller 22 is connected to the motor 25 through a chain drive, and chain drives are used between the driving roller 22, the first driven roller 23 and the second driven roller 24;

[0069] The first "U"-shaped yoke 31 is disposed between the first driven roller 23 and the second driven roller 24, and the second "U"-shaped yoke 51 is disposed between the driving roller 22 and the first driven roller 23;

[0070] The driving roller 22 is connected to the motor 25 through a chain drive, and the chain drive ensures the synchronous operation of the entire idler mechanism 2, reducing the damage to the bearing ring or the flaw detection error caused by the speed difference.

[0071] In one embodiment,

[0072] A liquid collecting tank 8 is arranged at the lower part of the frame 1, and spray pipes 9 are installed on both sides of the idler support 21 and on the first "U"-shaped yoke 31 and the second "U"-shaped yoke 51;

[0073] The above-mentioned liquid collecting tank 8 is connected to a pump and the spray pipe 9 through a conveying pipe to form a magnetic suspension liquid circulating spraying mechanism;

[0074] The magnetic suspension liquid is sprayed on the bearing ring through the spray pipe 9. After magnetization, magnetic powder will be adsorbed on the surface of the workpiece to form visible magnetic marks, thereby showing the position, shape and size of the discontinuity. The sprayed magnetic suspension liquid flows into the liquid collecting tank 8 and then is conveyed back to the spray pipe by the pump to realize circulating spraying.

[0075] In one embodiment, as Figure 5 shown,

[0076] The first auxiliary idler mechanism 4 includes a first bearing seat 41 installed on the frame 1, and a first auxiliary idler 42 rotatably installed on the first bearing seat 41;

[0077] The second auxiliary idler mechanism 7 includes a second bearing seat 71 installed on the frame 1, and a second auxiliary idler 72 rotatably installed on the second bearing seat 71;

[0078] Wherein, the length of the second auxiliary idler 72 is greater than that of the first auxiliary idler 42;

[0079] The main functions of the first auxiliary idler 42 and the second auxiliary idler 72 are to support the bearing ring and guide it in the magnetization position to ensure the stable rotation of the bearing ring during the flaw detection process. The second auxiliary idler 72 is designed with a longer length to adapt to large-sized bearing rings and provide a larger support area.

[0080] In one embodiment,

[0081] The first closed-circuit yoke 3 further includes a first linear guide 33, and the first "U"-shaped yoke 31 is slidably installed on the first linear guide 33 through a first slider, and the first "U"-shaped yoke 31 is driven by a first cylinder to move along the first linear guide 33;

[0082] The second closed magnetic yoke 5 further includes a second linear guide 53. The second U-shaped magnetic yoke 51 is slidably mounted on the second linear guide 53 through a second slider, and the second U-shaped magnetic yoke 51 is driven by a second air cylinder to move along the second linear guide 53.

[0083] In one embodiment,

[0084] The flaw detector is also provided with a darkroom, which includes a frame body covered with a light-shielding plate. Sound-absorbing cotton is filled between the light-shielding plate and the frame body, which helps to reduce the interference of external noise on the flaw detection operation and also reduces the external propagation of the noise that may be generated during the flaw detection process.

[0085] The above-mentioned frame body includes a fixed frame and a movable frame arranged on one side of the fixed frame. The movable frame is movably connected to the fixed frame through a guide rail, and a driving component for driving the movable frame to displace towards the fixed frame is fixedly connected to the fixed frame.

[0086] The movable frame is movably connected to the fixed frame through a guide rail, enabling the movable frame to achieve smooth movement and precise positioning before and after flaw detection.

[0087] In summary: A double-station bearing ring fluorescent magnetic particle flaw detector of the present invention designs different magnetization schemes for bearing rings of different specifications to meet diverse flaw detection requirements. It has good and uniform magnetization effect, no blind area, uniform magnetic field distribution, high detection accuracy, convenient loading and unloading of bearing rings, can adapt to batch flaw detection operations, and the design of double stations improves the utilization rate of the flaw detector. It belongs to non-contact operation, is easy to operate, safe and reliable.

[0088] It adopts PLC control. When magnetizing the bearing ring, it does not contact the workpiece, and the bearing ring is reliably supported, moves smoothly, the magnetic suspension liquid is sprayed evenly, and the flaw detection effect is good.

[0089] The above shows and describes the basic principles, main features and advantages of the present invention. The use of front, back, left and right in the text is not specifically referred to, mainly for more intuitively explaining the technical solution and does not play a limiting role. Those skilled in the art should understand that the above embodiments are only for explaining the technical concept and characteristics of the present invention, and their purpose is to enable those familiar with this technology to understand the content of the present invention and implement it, and cannot be used to limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A double-station bearing ring fluorescent magnetic particle flaw detector, characterized in that: It includes a frame (1), and also includes a first magnetization station and a second magnetization station arranged side by side on the frame (1); A roller mechanism (2) is arranged through the first magnetization station and the second magnetization station for carrying bearing rings; Among them, The first magnetization station includes a first closed magnetic yoke (3) and a first auxiliary roller mechanism (4). The first auxiliary roller mechanism (4) is inclinedly installed on the frame (1) above the first closed magnetic yoke (3) and is at a 90° angle to the roller mechanism (2); The first closed magnetic yoke (3) is of an opening and closing type, including a first "U"-shaped magnetic yoke (31) and a first "-"-shaped magnetic yoke (32). The first "-"-shaped magnetic yoke (32) is fixed on the frame (1), and the first "U"-shaped magnetic yoke (31) is slidably installed on the frame (1), and a first cylinder for driving it to make an opening and closing movement relative to the first "-"-shaped magnetic yoke (32) is provided at its end; The second magnetization station includes a second closed magnetic yoke (5), a fork-shaped coil (6) and a second auxiliary roller mechanism (7). The second auxiliary roller mechanism (7) is inclinedly installed on the frame (1) above the second closed magnetic yoke (5) and is at a 90° angle to the roller mechanism (2); Both the second closed magnetic yoke (5) and the fork-shaped coil (6) are of an opening and closing type, and the second closed magnetic yoke (5) and the fork-shaped coil (6) are arranged side by side on the frame (1); The second closed magnetic yoke (5) includes a second "U"-shaped magnetic yoke (51) and a second "-"-shaped magnetic yoke (52). The second "-"-shaped magnetic yoke (52) is fixed on the frame (1), and the second "U"-shaped magnetic yoke (51) is slidably installed on the frame (1), and a second cylinder for driving it to make an opening and closing movement relative to the second "-"-shaped magnetic yoke (52) is provided at its end; The fork-shaped coil (6) includes a first "U"-shaped conductor (61) and a second "U"-shaped conductor (62). The first "U"-shaped conductor (61) is installed on the second "U"-shaped magnetic yoke (51), and the second "U"-shaped conductor (62) is slidably installed on the frame (1), and a third cylinder for driving it to make an opening and closing movement relative to the first "U"-shaped conductor (61) is provided at its end.

2. A double-station bearing ring fluorescent magnetic particle flaw detector according to claim 1, characterized in that: The roller mechanism (2) is arranged at a certain angle to the horizontal plane and includes a roller support (21) installed on the frame (1), a driving roller (22), a first driven roller (23) and a second driven roller (24) arranged side by side on the roller support (21). The driving roller (22) and the first driven roller (23) are used for the second magnetization station, and the first driven roller (23) and the second driven roller (24) are used for the first magnetization station; The distance between the first driven roller (23) and the driving roller (22) is greater than the distance between the first driven roller (23) and the second driven roller (24).

3. A double-station bearing ring fluorescent magnetic particle flaw detector according to claim 2, characterized in that: The driving roller (22) is connected to a motor (25) through chain drive, and chain drive is adopted between the driving roller (22), the first driven roller (23) and the second driven roller (24); The first "U"-shaped magnetic yoke (31) is disposed between the first driven roller (23) and the second driven roller (24), and the second "U"-shaped magnetic yoke (51) is disposed between the driving roller (22) and the first driven roller (23).

4. A double-station bearing ring fluorescent magnetic particle flaw detector according to claim 2, characterized in that: A liquid collecting tank (8) is provided at the lower part of the frame (1), and spray pipes (9) are installed on both sides of the roller support (21) and on the first "U"-shaped magnetic yoke (31) and the second "U"-shaped magnetic yoke (51). The liquid collecting tank (8) is connected to a pump and the spray pipes (9) through a conveying pipe to form a magnetic suspension liquid circulating spraying mechanism.

5. A double-station bearing ring fluorescent magnetic particle flaw detector according to claim 1, characterized in that: The first auxiliary roller mechanism (4) includes a first bearing block (41) installed on the frame (1), and a first auxiliary roller (42) rotatably installed on the first bearing block (41). The second auxiliary roller mechanism (7) includes a second bearing block (71) installed on the frame (1), and a second auxiliary roller (72) rotatably installed on the second bearing block (71). Wherein, the length of the second auxiliary roller (72) is greater than that of the first auxiliary roller (42).

6. A double-station bearing ring fluorescent magnetic particle flaw detector according to claim 1, characterized in that: The first closed magnetic yoke (3) further includes a first linear guide (33), and the first "U"-shaped magnetic yoke (31) is slidably installed on the first linear guide (33) through a first slider, and the first "U"-shaped magnetic yoke (31) is driven by the first cylinder to move along the first linear guide (33). The second closed magnetic yoke (5) further includes a second linear guide (53), and the second "U"-shaped magnetic yoke (51) is slidably installed on the second linear guide (53) through a second slider, and the second "U"-shaped magnetic yoke (51) is driven by the second cylinder to move along the second linear guide (53).

7. A double-station bearing ring fluorescent magnetic particle flaw detector according to claim 1, characterized in that: The flaw detector is further provided with a darkroom, which includes a frame body covered with a light-shielding plate, and sound insulation cotton is filled between the light-shielding plate and the frame body. The frame body includes a fixed frame and a movable frame arranged on one side of the fixed frame. The movable frame is movably connected to the fixed frame through a guide rail, and a driving component for driving the movable frame to displace towards the fixed frame is fixedly connected to the fixed frame.

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