Impeller keyway concentricity detection production line and its detection process

Abstract

The invention discloses an impeller keyway concentricity detection production line and a detection process thereof. The impeller keyway concentricity detection production line comprises: an automatic conveying device, a blocking positioning device and a concentricity detection device; the automatic conveying device is used to convey a bearing box with a coupling, the conveying direction of the automatic conveying device is in the X direction, and the coupling located on the automatic conveying device is located in the Z direction; a blocking positioning device is installed in the middle of the automatic conveying device, and the blocking positioning device is used to position the bearing box with the coupling on the automatic conveying device; a concentricity detection device is installed next to the blocking positioning device, and the concentricity detection device is used to detect the concentricity of the keyway and the coupling; the concentricity detection device comprises: a bearing base, a sliding seat and a detection seat body. The impeller keyway concentricity detection production line and the detection process thereof solve the problem that the keyway concentricity detection cannot be realized in the prior art.

Description

Technical Field

[0001] The invention relates to the field of impeller production detection, and in particular to an impeller keyway concentricity detection production line and a detection process thereof. Background Art

[0002] like Figure 1 As shown, the centrifugal fan includes: a bearing box, a main shaft, a key, a coupling and an impeller disk. A rotatable main shaft is installed in the bearing box, and the main shaft can rotate relative to the bearing box. Couplings are connected to both ends of the main shaft, and the coupling extends outside the bearing box. A keyway is provided on the coupling, and the key is inserted into the keyway. The key and coupling at one end of the main shaft need to be inserted into the impeller disk. The impeller disk has a center hole that matches the size of the key and the coupling, so that the main shaft and the impeller rotate together. The key and the coupling at the other end of the main shaft need to be inserted into the output end of the rotation drive mechanism to drive the main shaft and the impeller to rotate.

[0003] During on-site production and assembly, the key and coupling are directly inserted into the impeller disc to achieve the installation and connection of the impeller disc. However, this method still has the following disadvantages:

[0004] The key is a block structure, and the keyway is a strip structure. The center line of the keyway should be in line with the axis of the coupling to meet the specifications, that is, the keyway is symmetrically arranged with the axis of the coupling. The keyway concentricity detection is to detect whether the center line of the keyway is in line with the axis of the coupling. The coupling and the impeller disc are interference fit. If the center line of the keyway is not in line with the axis of the coupling, the coupling with the key will not be able to be inserted into the center hole of the impeller disc, that is, the filling impeller assembly operation is often not assembled in place, and the impeller disc is stuck in the middle of the coupling, resulting in rework of the assembly process. Waiting for the coupling and impeller disc to cool before pulling will damage the center hole of the impeller disc and the surface accuracy and quality of the coupling, and also waste production cycles, greatly reducing production efficiency. Therefore, how to realize the concentricity detection of the keyway is an urgent problem to be solved. Summary of the invention

[0005] The present invention aims to provide an impeller keyway concentricity detection production line and a detection process thereof, so as to solve the problem that the keyway concentricity detection cannot be realized in the prior art.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] The present invention firstly discloses a production line for detecting the concentricity of an impeller keyway, comprising: an automatic conveying device, a blocking and positioning device and a concentricity detection device; the automatic conveying device is used to convey a bearing box with a coupling, the conveying direction of the automatic conveying device is in the X direction, and the coupling located on the automatic conveying device is in the Z direction; a blocking and positioning device is installed in the middle of the automatic conveying device, and the blocking and positioning device is used to position the bearing box with the coupling on the automatic conveying device; a concentricity detection device is installed next to the blocking and positioning device, and the concentricity detection device is used to detect the concentricity of the keyway and the coupling; the concentricity detection device comprises: a bearing base, a sliding seat and a detection seat body, a bearing base is installed on one side of the automatic conveying device, the bearing base is located on the side of the blocking and positioning device close to the input end of the automatic conveying device, a sliding seat capable of sliding in the Z direction is installed on the bearing base, a detection seat body is fixed on the sliding seat, an insertion hole is opened on the detection seat body, the inner wall of the insertion hole is used to be in close contact with the outer wall of the coupling, the inner wall of the insertion hole is recessed to form a notch, and the notch is used for inserting the end of the key located in the keyway.

[0008] Preferably, there are two blocking and positioning devices, which are symmetrically arranged on both sides of the automatic conveying device.

[0009] Preferably, each blocking positioning device comprises: a positioning plate, a guide rod, a buffer spring, a positioning arm and a rotary drive mechanism. The positioning plate is located on the side of the positioning arm close to the input end of the automatic conveying device. A guide rod is fixed to the positioning plate. The guide rod passes through the positioning arm. The guide rod is guided by the positioning arm to move in the X direction. A buffer spring is installed between the positioning arm and the positioning plate. The bottom end of the positioning arm is fixed to the output end of the rotary drive mechanism. The rotary drive mechanism is used to drive the positioning arm to deviate from the forward direction of the bearing box with a coupling.

[0010] Preferably, the automatic conveying device includes: a conveyor belt and side positioning blocks, a bearing box with a coupling is placed on the conveyor belt body, side positioning blocks are installed on both sides of the conveyor belt body, and the side positioning blocks are tightly attached to the bottom of the bearing box with a coupling.

[0011] Preferably, a guide rail is installed on the bearing seat body, and the guide rail guides the sliding seat to slide on the bearing seat body.

[0012] Preferably, a lifting seat capable of lifting and lowering is installed on the sliding seat, and a rotatable rotating roller is installed below the lifting seat, at least one rotating roller is used to be in close contact with one end of the key, and at least one rotating roller is used to be in close contact with the other end of the key.

[0013] Preferably, a lifting spring is installed between the lifting seat and the sliding seat, and the lifting spring is used to lift the lifting seat.

[0014] Preferably, the bottom of the lifting seat is extended to form an extension foot, and the guide rail is provided with a central groove for the extension foot to slide, the central groove is an inverted "T"-shaped structure, the bottom end of the extension foot is the large end, and the top surface of the guide rail is recessed to form a receiving groove, which is connected to the central groove. The receiving groove can allow the large end of the extension foot to rise, and when the large end of the extension foot is located in the receiving groove, the detection seat body is located away from the coupling.

[0015] Preferably, a mounting foot is fixed to the bottom surface of the lifting seat, and the mounting foot can rotate relative to the rotating roller.

[0016] The present invention also discloses a process for detecting the concentricity of an impeller keyway, comprising the following steps:

[0017] S1. Prepare an impeller keyway concentricity detection production line, which includes: an automatic conveying device, a blocking and positioning device, and a concentricity detection device; the automatic conveying device is used to convey the bearing box with the coupling, the conveying direction of the automatic conveying device is in the X direction, and the coupling located on the automatic conveying device is in the Z direction; a blocking and positioning device is installed in the middle of the automatic conveying device, and the blocking and positioning device is used to position the bearing box with the coupling on the automatic conveying device; a concentricity detection device is installed next to the blocking and positioning device, and the concentricity detection device is used to detect the concentricity of the keyway and the coupling; the concentricity detection device includes: a bearing base, a sliding seat, and a detection seat body, a bearing base is installed on one side of the automatic conveying device, the bearing base is located on the side of the blocking and positioning device close to the input end of the automatic conveying device, a sliding seat that can slide in the Z direction is installed on the bearing base, and a detection seat body is fixed on the sliding seat, and the detection seat body is provided with an insertion hole, the inner wall of the insertion hole is used to be in close contact with the outer wall of the coupling, and the inner wall of the insertion hole is recessed to form a notch, and the notch is for the key end located in the keyway to be inserted;

[0018] S2. Assembling a bearing box with a coupling, so that the bearing box with a coupling comprises: a bearing box, a main shaft, a coupling and a key, a main shaft capable of rotating is installed in the bearing box, couplings extending to the outside of the bearing box are installed at both ends of the main shaft, a keyway is provided on the coupling, and a key is inserted into the keyway;

[0019] S3. Place the bearing box with the coupling on the automatic conveying device and ensure that the axis of the coupling is in the Z direction;

[0020] S4, the blocking and positioning device blocks the bearing box with the coupling at a position aligned with the concentricity detection device;

[0021] S5. The detection seat on the manually driven concentricity detection device is close to the coupling and the key to determine whether the coupling and the key can be inserted into the insertion hole and the slot respectively. If so, it is determined that the key slot is concentric with the coupling; if not, it is determined that the key slot is not concentric with the coupling;

[0022] S6. The blocking positioning device releases the bearing box currently equipped with the coupling.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] Firstly, by setting up an automatic conveying device, the bearing box with a coupling can be automatically conveyed, avoiding manual conveying and resulting in reduced detection efficiency; then, a blocking positioning device is set to position the bearing box with a coupling next to the concentricity detection device to ensure that the bearing box with a coupling can be aligned with the concentricity detection device; finally, a concentricity detection device is set, and the detection seat is manually moved close to the bearing box with a coupling to determine whether the relative position of the key and the coupling on the bearing box with a coupling is correct. The length of the key in the vertical direction of the axis of the coupling is slightly different, and the slot is large enough to ensure that both ends of the key can be inserted. Only when the upper and lower surfaces of the key deviate from the center position of the coupling, it cannot be inserted into the slot or the center hole of the impeller disk. That is, at this time, the keyway deviates from the axis of the coupling and is not concentric, thereby realizing the detection of whether the keyway and the coupling are concentric.

[0025] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the structure of the bearing box in a centrifugal fan.

[0027] Figure 2 This is a schematic diagram of the structure of the impeller keyway concentricity detection production line.

[0028] Figure 3 It is a structural schematic diagram of the blocking positioning device.

[0029] Figure 4 It is a structural schematic diagram of the concentricity detection device.

[0030] Figure 5 It is a schematic diagram of the structure of the detection seat.

[0031] Figure 6 It is a schematic diagram of the structure at the sliding seat.

[0032] Figure 7 It is a schematic diagram of the structure of the lifting seat.

[0033] Figure numerals: bearing box 11, main shaft 12, key 13, coupling 14, automatic conveying device 2, conveyor belt 21, side positioning block 22, blocking positioning device 3, positioning plate 31, guide rod 32, buffer spring 33, positioning arm 34, rotation drive mechanism 35, concentricity detection device 5, bearing base 51, sliding seat 52, detection seat body 53, insertion hole 530, missing groove 531, guide rail 54, center groove 540, accommodating groove 541, lifting seat 55, rotating roller 56, lifting spring 57, extension foot 58, mounting foot 59. DETAILED DESCRIPTION

[0034] In order to make the technical means, creative features, objectives and functions achieved by the present invention clearer and easier to understand, the present invention is further explained below in conjunction with the accompanying drawings and specific implementation methods.

[0035] Embodiment 1:

[0036] like Figures 2 to 7 As shown, the present invention first discloses a concentricity detection production line for an impeller key 13, comprising: an automatic conveying device 2, a blocking positioning device 3 and a concentricity detection device 5; the automatic conveying device 2 is used for conveying a bearing box 11 with a coupling 14 on a conveyor belt 21, the conveying direction of the automatic conveying device 2 is in the X direction, and the coupling 14 located on the automatic conveying device is in the Z direction; a blocking positioning device 3 is installed in the middle of the automatic conveying device 2, and the blocking positioning device 3 is used to position the bearing box 11 with the coupling 14 on the automatic conveying device 2; a concentricity detection device 5 is installed next to the blocking positioning device 3, and the concentricity detection device 5 is used to detect The concentricity of the key 13 and the coupling 14; the concentricity detection device 5 includes: a bearing base 51, a sliding seat 52 and a detection seat body 53. The bearing base 51 is installed on one side of the automatic conveying device 2, and the bearing base 51 is located on the side of the blocking and positioning device 3 close to the input end of the automatic conveying device 2. A sliding seat 52 that can slide in the Z direction is installed on the bearing base 51, and a detection seat body 53 is fixed on the sliding seat 52. The detection seat body 53 is provided with an insertion hole 530, and the inner wall of the insertion hole 530 is used to be in close contact with the outer wall of the coupling 14. The inner wall of the insertion hole 530 is recessed to form a notch 531, and the notch 531 is for the end of the key 13 located in the key 13 to be inserted.

[0037] There are two blocking positioning devices 3, and the two blocking positioning devices 3 are symmetrically arranged on both sides of the automatic conveying device 2. The two blocking positioning devices 3 block the bearing box 11 with the coupling 14 from continuing to be conveyed, so as to prevent the bearing box 11 with the coupling 14 from being unable to be conveyed to the specified position.

[0038] Each blocking and positioning device 3 includes: a positioning plate 31, a guide rod 32, a buffer spring 33, a positioning arm 34 and a rotation drive mechanism 35. The positioning plate 31 is located on the side of the positioning arm 34 close to the input end of the automatic conveying device 2. The positioning plate 31 is fixed with a guide rod 32, which passes through the positioning arm 34 and is guided by the positioning arm 34 to move in the X direction. A buffer spring 33 is installed between the positioning arm 34 and the positioning plate 31. The bottom end of the positioning arm 34 is fixed to the output end of the rotation drive mechanism 35. The rotation drive mechanism 35 is used to drive the positioning arm 34 to deviate from the forward direction of the bearing box 11 with the coupling 14. The positioning plate 31 blocks the bearing box 11 with the coupling 14 from continuing to be conveyed, and the buffer spring 33 buffers the movement of the bearing box 11 with the coupling 14. The setting of the rotating drive mechanism 35 drives the positioning arm 34 and the positioning plate 31 to rotate to a position deviating from the forward direction of the bearing box 11 with the coupling 14, releasing the bearing box 11 with the coupling 14 so that the bearing box 11 with the coupling 14 can continue to be transported.

[0039] The automatic conveying device includes: a conveyor belt 21 and a side positioning block 22. The bearing box 11 with the coupling 14 is placed on the conveyor belt 21. The side positioning blocks 22 are installed on both sides of the conveyor belt 21. The side positioning blocks 22 are in close contact with the bottom of the bearing box 11 with the coupling 14. The conveyor belt 21 has the bearing box 11 with the coupling 14. The side positioning blocks 22 are used to position the bearing box 11 with the coupling 14 in the Z direction.

[0040] A guide rail 54 is installed on the bearing seat body, and the guide rail 54 guides the sliding seat 52 to slide on the bearing seat body, so that the movement of the sliding seat 52 is in the Z direction, and the sliding seat 52 is prevented from moving randomly.

[0041] A lifting seat 55 capable of lifting and lowering is installed on the sliding seat 52, and a rotating roller 56 capable of rotating is installed below the lifting seat 55. At least one rotating roller 56 is used to be in close contact with one end of the key 13, and at least one rotating roller 56 is used to be in close contact with the other end of the key 13. Since the main shaft 12 and the coupling 14 rotate relative to the bearing box 11, the key 13 may not be located in the horizontal direction due to the rotation of the main shaft 12. It is also normal for the main shaft 12 to have a certain deflection during the conveying process. In order to avoid the above phenomenon, the lifting seat 55 and the rotating roller 56 are set to press down the two ends of the key 13 together, so that the key 13 is in the horizontal direction to align with the missing groove 531 on the detection seat body 53.

[0042] A lifting spring 57 is installed between the lifting seat 55 and the sliding seat 52, and the lifting spring 57 is used to raise the lifting seat 55. The lifting spring 57 is to make the rotating roller 56 and the lifting seat 55 at a higher position, thereby preventing the rotating roller 56 and the like from blocking the movement of the coupling 14.

[0043] The bottom of the lifting seat 55 extends to form an extension foot 58. The guide rail 54 is provided with a central groove 540 for the extension foot 58 to slide. The central groove 540 is an inverted "T"-shaped structure. The bottom end of the extension foot 58 is a large end. The top surface of the guide rail 54 is recessed to form a receiving groove 541. The receiving groove 541 is connected to the central groove 540. The receiving groove 541 can allow the large end of the extension foot 58 to rise. When the large end of the extension foot 58 is located in the receiving groove 541, the detection seat body 53 is located away from the coupling 14. The sliding seat 52 has two positions, one position is away from the work station, and the other position is the detection work station. The side of the sliding seat 52 away from the conveyor belt 21 is protruding to form a protruding edge. The protruding edge is used to be in close contact with the sliding seat 52. When the protruding edge is in close contact with the sliding seat 52, the sliding seat 52 is located in the away position. At this time, the extension foot 58 is raised to the receiving groove 541, and the rotating roller 56 is also in a higher position, that is, the initial position. When testing, first manually press down the lifting seat 55, so that the extension foot 58 and the receiving groove 541 push, the extension foot 58 and the center groove 540 are aligned, and at the same time, the rotating roller 56 presses down the two ends of the key 13 to ensure that the key 13 is in the horizontal direction; then, move the sliding seat 52, so that the detection seat body 53 is close to the coupling 14 and the key 13 to detect whether they are concentric. Therefore, the extension foot 58 and the inner wall of the receiving groove 541 cooperate to position the sliding seat 52, and at the same time ensure that the rotating roller 56 can be raised to a higher position. At the same time, it is also realized that the detection seat body 53 can be moved for testing only after the lifting seat 55 and the rotating roller 56 press down the key 13, avoiding the disorder of the operation sequence and resulting in the inability to realize the detection.

[0044] The bottom surface of the lifting seat 55 is fixed with a mounting foot 59, and the mounting foot 59 can rotate relative to the rotating roller 56. The mounting foot 59 provides a mounting base for the rotating roller 56.

[0045] Embodiment 2:

[0046] like Figures 2 to 7 As shown, based on the impeller key 13 concentricity detection production line of embodiment 1, the present invention also discloses a concentricity detection process of the impeller key 13, comprising the following steps:

[0047] S1. Prepare the impeller key 13 concentricity detection production line, which includes: an automatic conveying device 2, a blocking and positioning device 3 and a concentricity detection device 5; the automatic conveying device 2 is used to convey the bearing box 11 with the coupling 14, the conveying direction of the automatic conveying device 2 is in the X direction, and the coupling 14 located on the automatic conveying device is in the Z direction; a blocking and positioning device 3 is installed in the middle of the automatic conveying device 2, and the blocking and positioning device 3 is used to position the bearing box 11 with the coupling 14 on the automatic conveying device 2; a concentricity detection device 5 is installed next to the blocking and positioning device 3, and the concentricity detection device 5 is used to The concentricity detection device 5 comprises: a bearing base 51, a sliding base 52 and a detection base body 53. The bearing base 51 is installed on one side of the automatic conveying device 2. The bearing base 51 is located on the side of the blocking positioning device 3 close to the input end of the automatic conveying device 2. A sliding base 52 that can slide in the Z direction is installed on the bearing base 51. The detection base body 53 is fixed on the sliding base 52. The detection base body 53 is provided with an insertion hole 530. The inner wall of the insertion hole 530 is used to be in close contact with the outer wall of the coupling 14. The inner wall of the insertion hole 530 is recessed to form a notch 531. The notch 531 is for inserting the end of the key 13 located in the keyway;

[0048] S2, assembling the bearing box 11 with the coupling 14, so that the bearing box 11 with the coupling 14 includes: the bearing box 11, the main shaft 12, the coupling 14 and the key 13, the main shaft 12 that can rotate is installed in the bearing box 11, the coupling 14 extending to the outside of the bearing box 11 is installed at both ends of the main shaft 12, the coupling is provided with a keyway, and the key 13 is inserted into the keyway;

[0049] S3, placing the bearing box 11 with the coupling 14 on the automatic conveying device 2, and ensuring that the axis of the coupling 14 is located in the Z direction;

[0050] S4, the blocking and positioning device 3 blocks the bearing box 11 with the coupling 14 at a position aligned with the concentricity detection device 5;

[0051] S5, manually drive the detection seat 53 on the concentricity detection device 5 to approach the coupling 14 and the key 13, and determine whether the coupling 14 and the key 13 can be inserted into the insertion hole 530 and the slot 531 respectively. If so, it is determined that the key 13 is concentric with the coupling 14; if not, it is determined that the key 13 is not concentric with the coupling 14;

[0052] S6 , the blocking and positioning device 3 releases the bearing box 11 currently having the coupling 14 .

[0053] After executing step S3 and before executing step S4, it is necessary to execute: pressing the key 13 operation: pressing down the lifting seat 55 and the rotating roller 56, so that the rotating roller 56 presses down both ends of the key 13, and the key 13 remains in the horizontal direction.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. Impeller keyway concentricity detection production line, characterized by: include: Automatic conveying device, blocking positioning device and concentricity detection device; The automatic conveying device is used to convey the bearing box with the coupling. The conveying direction of the automatic conveying device is in the X direction, and the coupling located on the automatic conveying device is located in the Z direction. A blocking and positioning device is installed in the middle of the automatic conveying device, and the blocking and positioning device is used to position the bearing box with the coupling on the automatic conveying device; A concentricity detection device is installed next to the blocking positioning device, and the concentricity detection device is used to detect the concentricity of the keyway and the coupling; The concentricity detection device comprises: a bearing base, a sliding base and a detection base body, wherein the bearing base is installed on one side of the automatic conveying device, the bearing base is located on the side of the blocking positioning device close to the input end of the automatic conveying device, a sliding base capable of sliding in the Z direction is installed on the bearing base, a detection base body is fixed on the sliding base, an insertion hole is opened on the detection base body, the inner wall of the insertion hole is used to be in close contact with the outer wall of the coupling, the inner wall of the insertion hole is recessed to form a notch, and the notch is for the key end located in the keyway to be inserted; A guide rail is installed on the bearing seat body, and the guide rail guides the sliding seat to slide on the bearing seat body; A lifting seat capable of lifting and lowering is installed on the sliding seat, and a rotating roller capable of rotating is installed below the lifting seat, at least one rotating roller is used to be in close contact with one end of the key, and at least one rotating roller is used to be in close contact with the other end of the key; A lifting spring is installed between the lifting seat and the sliding seat, and the lifting spring is used to lift the lifting seat; The bottom of the lifting seat is extended to form an extension foot, and the guide rail is provided with a central groove for the extension foot to slide. The central groove is an inverted "T"-shaped structure. The bottom end of the extension foot is the large end. The top surface of the guide rail is recessed to form a receiving groove, which is connected to the central groove. The receiving groove can allow the large end of the extension foot to rise. When the large end of the extension foot is located in the receiving groove, the detection seat body is located away from the coupling.

2. The impeller keyway concentricity detection production line according to claim 1 is characterized in that: There are two blocking and positioning devices, which are symmetrically arranged on both sides of the automatic conveying device.

3. The impeller keyway concentricity detection production line according to claim 2 is characterized in that: Each blocking positioning device includes: a positioning plate, a guide rod, a buffer spring, a positioning arm and a rotary drive mechanism. The positioning plate is located on the side of the positioning arm close to the input end of the automatic conveying device. A guide rod is fixed to the positioning plate. The guide rod passes through the positioning arm. The guide rod is guided by the positioning arm to move in the X direction. A buffer spring is installed between the positioning arm and the positioning plate. The bottom end of the positioning arm is fixed to the output end of the rotary drive mechanism. The rotary drive mechanism is used to drive the positioning arm to deviate from the forward direction of the bearing box with a coupling.

4. The impeller keyway concentricity detection production line according to claim 3 is characterized in that: The automatic conveying device comprises: a conveyor belt and a side positioning block. A bearing box with a coupling is placed on the conveyor belt body. Side positioning blocks are installed on both sides of the conveyor belt body. The side positioning blocks are tightly attached to the bottom of the bearing box with the coupling.

5. The impeller keyway concentricity detection production line according to claim 1 is characterized in that: A mounting foot is fixed on the bottom surface of the lifting seat, and the mounting foot can rotate relative to the rotating roller.

6. Impeller keyway concentricity detection process, characterized in that: The steps include: S1. Prepare the impeller keyway concentricity detection production line as described in claim 1, wherein the impeller keyway concentricity detection production line comprises: an automatic conveying device, a blocking positioning device and a concentricity detection device; the automatic conveying device is used to convey the bearing box with the coupling, the conveying direction of the automatic conveying device is in the X direction, and the coupling located on the automatic conveying device is located in the Z direction; a blocking positioning device is installed in the middle of the automatic conveying device, and the blocking positioning device is used to position the bearing box with the coupling on the automatic conveying device; a concentricity detection device is installed next to the blocking positioning device, and the concentricity detection device is used to detect the concentricity of the keyway and the coupling; the concentricity detection device comprises: a bearing base, a sliding seat and a detection seat body, a bearing base is installed on one side of the automatic conveying device, the bearing base is located on the side of the blocking positioning device close to the input end of the automatic conveying device, and a sliding seat capable of sliding in the Z direction is installed on the bearing base The sliding seat is fixed with a detection seat body, the detection seat body is provided with an insertion hole, the inner wall of the insertion hole is used to be in close contact with the outer wall of the coupling, the inner wall of the insertion hole is recessed to form a notch, and the notch is provided for the key end portion located in the key slot to be inserted; a guide rail is installed on the bearing seat body, and the guide rail guides the sliding seat to slide on the bearing seat body; a lifting seat that can be raised and lowered is installed on the sliding seat, and a rotatable rotating roller is installed below the lifting seat to be in close contact with one end of the key, and at least one rotating roller is used to be in close contact with the other end of the key; a lifting spring is installed between the lifting seat and the sliding seat, and the lifting spring is used to lift the lifting seat; the bottom of the lifting seat extends to form an extension foot, and the guide rail is provided with a central groove for the extension foot to slide, the central groove is an inverted "T"-shaped structure, the bottom end of the extension foot is the large end, and the top surface of the guide rail is recessed to form a receiving groove, the receiving groove is connected with the central groove, and the receiving groove can be used to lift the large end of the extension foot, and when the large end of the extension foot is located in the receiving groove, the detection seat body is located away from the coupling; S2. Assembling a bearing box with a coupling, so that the bearing box with a coupling comprises: a bearing box, a main shaft, a coupling and a key, a main shaft capable of rotating is installed in the bearing box, couplings extending to the outside of the bearing box are installed at both ends of the main shaft, a keyway is provided on the coupling, and a key is inserted into the keyway; S3. Place the bearing box with the coupling on the automatic conveying device and ensure that the axis of the coupling is in the Z direction; S4, the blocking and positioning device blocks the bearing box with the coupling at a position aligned with the concentricity detection device; S5. The detection seat on the manually driven concentricity detection device is close to the coupling and the key to determine whether the coupling and the key can be inserted into the insertion hole and the slot respectively. If so, it is determined that the key slot is concentric with the coupling; if not, it is determined that the key slot is not concentric with the coupling; S6. The blocking positioning device releases the bearing box currently equipped with the coupling.

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