Compressor main shaft single-side axial displacement detection equipment

Abstract

The utility model discloses a single-side axial displacement detection device for a compressor spindle, which is characterized in that a top cylinder drives a lifting plate to move downwards, a surface pressing table presses and fixes a compressor on a conveying tool which is ejected by an ejection assembly to be separated from a conveying chain, and a lower cylinder drives a detection table to move downwards. The end face of the main shaft is pressed downwards through the pressing connection face of the pressing table till the end face cannot rotate (the preset pressing pressure value), then the drive motor drives the drive disc to drive the rotary wheel disc through the belt to rotate the drive rod, then the threaded connector is connected into the threaded hole of the main shaft in a threaded mode, and after preset torque is achieved, the end face of the drive rod is pressed and fixed to the detection plane of the pressing table. And then after the lower cylinder drives the detection table to move upwards to a preset pull-up force value, the displacement, detected by the displacement sensor, of the lower pressing table is the axial displacement of the main shaft. The main shaft is pressed and fixed to the bottommost position through the lower pressing table, and it is ensured that the threaded connector cannot rotate relatively when entering or exiting from the threaded hole of the main shaft.

Description

Technical Field

[0001] The utility model belongs to the field of compressor quality detection, in particular to a device for detecting the axial movement amount of a compressor main shaft on one side. Background Art

[0002] The axial play of the compressor's main shaft is an important parameter that affects the compressor's performance. The amount of main shaft play is directly related to the compressor's operating stability. If the play is too large, the clearance between the internal parts of the compressor will be too large, which will cause problems such as vibration and noise, and may even damage the compressor. Therefore, by detecting the amount of main shaft play, these problems can be discovered and solved in time to ensure the stable operation of the compressor.

[0003] For example: CN210293654U discloses a compressor main shaft axial movement measuring machine, including a lower frame, the upper end of the lower frame is connected to the upper frame, the bottom of the upper frame is installed with an axial movement tooling through a slide, the upper end of the upper frame is installed with a clamping cylinder, one side of the upper frame is installed with a human-machine interface, one side of the lower frame is connected with an electrical box, the upper end of the lower frame is installed with an air control assembly and a lower push rod assembly, and the output end of the clamping cylinder extends to the interior of the upper frame. This compressor main shaft axial movement measuring machine fixes the equipment through the lower frame and the upper frame, uses a clamping cylinder to clamp the compressor body, and adopts a downward pressure cylinder and a bottom cylinder to press up and down design. The above-mentioned main shaft axial movement detection is to apply pressure from the top and bottom to detect the axial movement amount, but there will be the following problems: since the existing variable displacement compressor can only be detected after the rear end cover is assembled, the bottom of the compressor is in a blocked state, and it is impossible to apply pressure to the main shaft from the bottom to detect the axial movement amount. Summary of the invention

[0004] The technical problems to be solved by the utility model are:

[0005] How to solve the problem of rapid detection of axial movement of the main shaft of a variable displacement compressor with a closed bottom.

[0006] In order to solve the above technical problems, the inventors have obtained the technical solution of the utility model through practice and summary. The utility model adopts the following technical solution:

[0007] A device for detecting axial movement of a compressor main shaft on one side, comprising:

[0008] A conveying tool 10, the conveying tool 10 is located on the conveying chain 11 and is used to carry the compressor;

[0009] An upper lift assembly 20, which is used to lift the conveying tooling 10 upward to separate it from the conveying chain 11;

[0010] The downward pressing structure 30 is used to vertically press down and fix the compressor end cover on the conveying tooling 10. A downward pressing and pulling unit is installed on the downward pressing structure 30. The downward pressing and pulling unit includes a downward pressing and pulling unit and a detection unit. The downward pressing and pulling unit is used to press the main shaft downward to a predetermined downward pressing pressure value and pull the main shaft upward to a predetermined upward pulling force value. The detection unit is used to detect the axial displacement of the main shaft in the range from the predetermined downward pressing pressure value to the predetermined upward pulling force value.

[0011] Preferably, the downward pressure structure 30 includes a mounting frame 31, a top cylinder 32 is installed on the top of the mounting frame 31, a mechanical sensor 33 is installed on the piston end of the top cylinder 32, and a lifting plate 34 is installed through the mechanical sensor 33. The lifting plate 34 is vertically slidably installed on the mounting frame 31, and a surface pressure platform 35 and a vertical rod 36 are installed on the lifting plate 34. The surface pressure platform 35 is used to press down and fix the compressor end cover, and the vertical rod 36 is used to vertically guide the lifting plate 34, and a hollow structure is arranged in the middle of the surface pressure platform 35.

[0012] Preferably, the pressing and pulling unit includes a lower cylinder 37 installed on the lifting plate 34, and a mechanical sensor 38 is installed on the piston end of the lower cylinder 37, and a detection platform 39 is connected through the mechanical sensor 38. The detection platform 39 is vertically slidably fitted on the mounting frame 31, and a pressing platform 395 is installed on the lower surface of the detection platform 39. The pressing platform 395 is used to press down the end face of the main shaft until the main shaft cannot rotate. The upper surface of the pressing platform 395 is a detection plane, and the lower surface is a crimping surface. The crimping surface is used to press down the end face of the main shaft. A through hole is provided in the middle of the detection platform 39 and the pressing platform 395, and an axial threaded pulling structure is installed in the through hole. The axial threaded pulling structure is used to axially threadedly connect the main shaft threaded hole and press down the pressing platform 395.

[0013] Preferably, the axial threaded pulling structure includes a driving rod 310, a threaded joint 311 and a rotating assembly. The driving rod 310 vertically passes through the through hole on the detection platform 39, and a threaded joint 311 is installed at the bottom. The threaded joint 311 is located in the through hole of the lower pressing platform 395. A rotating wheel 312 is mounted on the driving rod 310, and a driving motor 313 is installed on the lifting plate 34. The driving motor 313 drives the driving disk 314 to rotate, and the driving disk 314 drives the rotating wheel 312 to rotate via a belt. The driving rod 310 and the rotating wheel 312 can slide vertically relative to each other without relative rotation.

[0014] Preferably, a spline hole is provided on the rotary wheel 312, and a spline structure adapted to the spline hole is provided on the driving rod.

[0015] Preferably, the detection platform 39 includes a bottom plate 391, a top plate 392, and a side plate 393 connecting the bottom plate 391 and the top plate 392;

[0016] The lower pressing platform 395 is fixed on the lower surface of the bottom plate 391;

[0017] The second mechanical sensor 38 is installed on the upper surface of the top plate 392, and the second mechanical sensor 38 is used to detect the upward pulling force value and the downward pressing force value of the main shaft;

[0018] A guide sleeve 394 is installed on the lower surface of the top plate 392, and the guide sleeve 394 is used to limit the top of the driving rod 310 and slide with it;

[0019] A guide groove is provided on the side plate 393 , and a vertical guide rail 315 adapted to the guide groove is provided on the mounting frame 31 .

[0020] Preferably, two signal sensors 396 are installed on the upper surface of the bottom plate 391 for detecting the initial position and final position signals of the threaded connection.

[0021] Preferably, the detection unit includes a displacement sensor installed on the lifting plate 34 , and the displacement sensor is used to detect the axial displacement of the lower pressing platform 395 .

[0022] Preferably, the upper lifting component 20 includes a lifting cylinder 21 and a positioning pin 22. The lifting cylinder 21 is located below the conveying tooling 10 at the detection station. A support platform 23 is installed on the top of the lifting cylinder 21. Guide rods 24 are vertically installed at the four corners of the support platform 23. A positioning pin 22 is provided on the support platform 23. The positioning pin 22 is used to support the conveying tooling 10 to separate from the conveying chain.

[0023] An online detection method for the axial movement of a compressor main shaft, the detection steps are as follows:

[0024] Compressor delivery:

[0025] The compressor is placed on the conveying tooling 10 and transported to the inspection station via the conveying chain 11. The lifting cylinder 21 drives the support 23 and the positioning pin 22 upward, and the conveying tooling 10 is lifted off the conveying chain 11.

[0026] Compressor end cover compression:

[0027] The top cylinder 32 drives the lifting plate 34 downward through the mechanical sensor 33, and uses the surface pressure platform 35 to press and fix the compressor end cover. The pressure value is 150-190kg, and the pressure value is detected by the mechanical sensor 33;

[0028] Axial movement detection:

[0029] The lower cylinder 37 drives the detection platform 39, the driving motor 313, the driving disk 314, and the rotating wheel 312 to move downward together through the mechanical sensor 2 38, and the pressing platform 395 moves downward to the pressing surface to press the end face of the spindle until it moves downward to a predetermined pressing pressure value, at which time the spindle cannot rotate;

[0030] During the downward movement, the threaded joint 311 abuts against the end of the main shaft and drives the driving rod 310 to move upward relative to the pressing platform 395;

[0031] The driving motor 313 drives the driving disk 314 to rotate, and the driving disk 314 drives the rotating wheel 312 to rotate via the belt, driving the threaded joint 311 to threadably engage with the threaded hole of the spindle, until the threaded joint 311 is pressed onto the detection plane of the lower pressing platform 395, and until a predetermined torque value is reached, the lower pressing platform 395 is pressed between the driving rod 310 and the end face of the spindle;

[0032] The lower cylinder 37 drives the detection platform 39, the lower pressing platform 395 and the threaded joint 311 upward through the mechanical sensor 2 38. When the upper pulling force value is reached, the upper pulling force value and the lower pressing pressure value are both detected by the mechanical sensor 2 38. The displacement sensor is used to detect the axial displacement of the main shaft in the interval from the predetermined lower pressing pressure value to the predetermined upper pulling force value, which is the axial displacement of the lower pressing platform 395.

[0033] The driving motor 313 drives the driving disk 314 to rotate in the opposite direction, the driving rod 310 drives the threaded joint 311 to reversely exit the main shaft threaded hole, the lower cylinder 37 drives the detection table 39 to move upward to the initial position, and the top cylinder 32 drives the lifting plate 34 to move upward to the initial position

[0034] Compared with the prior art, the utility model has the following beneficial effects:

[0035] The utility model drives the lifting plate downward through the top cylinder, and presses down and fixes the compressor on the conveying tooling that is separated from the conveying chain by the upper top component through the surface pressure platform, and the lower cylinder drives the detection platform downward, and presses down the end face of the main shaft through the crimping surface of the lower pressure platform until it cannot rotate (predetermined downward pressure value), and then drives the driving motor to drive the driving plate through the belt to drive the rotating wheel to rotate the driving rod, and then the threaded joint is threadedly connected to the main shaft threaded hole. After reaching the predetermined torque, the end face of the driving rod is crimped and fixed on the detection plane of the lower pressure platform, and then the lower cylinder drives the detection platform upward to the predetermined upper pulling force value. The displacement of the lower pressure platform detected by the displacement sensor is the axial movement of the main shaft. The main shaft is pressed and fixed to the bottom position by the lower pressure platform to ensure that the threaded joint cannot rotate relative to each other when entering or exiting the main shaft threaded hole.

[0036] The utility model ensures accurate detection of the spindle axial movement by completing unilateral detection at the top by pressing down and pulling. When the lower cylinder pulls and presses down the spindle, a mechanical sensor is used to achieve a predetermined pressure value and a predetermined pulling force value. This can effectively eliminate the displacement of the piston rod that is prone to occur when the lower cylinder is directly pressed down and pulled, thereby improving accuracy. The spindle axial movement is detected by a displacement sensor. At the same time, the utility model also cooperates with the conveying tooling and the upper top assembly to achieve online continuous detection and improve work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is the overall structural front view of the utility model;

[0038] Figure 2 This is the overall structural front view of the downward pressing structure of the utility model;

[0039] Figure 3 It is a schematic diagram of the overall structure of the downward pressing and pulling unit of the utility model;

[0040] Figure 4 It is a schematic diagram of the overall structure of the upper lift assembly of the utility model.

[0041] In the figure:

[0042] 10. Conveying tooling; 11. Conveying chain;

[0043] 20. Lifting assembly; 21. Lifting cylinder; 22. Positioning pin; 23. Capping platform; 24. Guide rod;

[0044] 30. Down-pressing structure; 31. Mounting frame; 32. Top cylinder; 33. Mechanical sensor 1; 34. Lifting plate; 35. Surface pressure table; 36. Vertical rod; 37. Lower cylinder; 38. Mechanical sensor 2; 39. Inspection table; 391. Bottom plate; 392. Top plate; 393. Side plate; 394. Guide sleeve; 395. Down-pressing table; 396. Signal sensor; 310. Drive rod; 311. Threaded joint; 312. Rotating wheel; 313. Drive motor; 314. Drive disk; 315. Vertical guide rail. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0046] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0047] Embodiment 1, as Figures 1 to 4 As shown, a device for detecting axial movement of a compressor main shaft on one side includes:

[0048] A conveying tool 10, the conveying tool 10 is located on the conveying chain 11 and is used to carry the compressor;

[0049] An upper lift assembly 20, which is used to lift the conveying tooling 10 upward to separate it from the conveying chain 11;

[0050] The downward pressing structure 30 is used to vertically press down and fix the compressor end cover on the conveying tooling 10. A downward pressing and pulling unit is installed on the downward pressing structure 30. The downward pressing and pulling unit includes a downward pressing and pulling unit and a detection unit. The downward pressing and pulling unit is used to press the main shaft downward to a predetermined downward pressing pressure value and pull the main shaft upward to a predetermined upward pulling force value. The detection unit is used to detect the axial displacement of the main shaft in the range from the predetermined downward pressing pressure value to the predetermined upward pulling force value.

[0051] In this embodiment, a contoured structure is provided on the conveying fixture 10 to hold the compressor, which is conveyed to the inspection station through the conveying chain 11. The upper push component 20 separates it from the conveying chain 11 and enters the inspection point. The downward pressing structure 30 presses down vertically from the top to tighten the compressor end cover surface on the conveying fixture 10. The downward pressing and pulling unit presses the main shaft end face from the top of the compressor to the bottommost position (predetermined downward pressing pressure value) to prevent it from rotating. The main shaft is then pulled upward. The detection unit is used to detect the upward displacement of the main shaft during the upward pulling from the bottom, that is, the axial movement of the main shaft.

[0052] Embodiment 2, based on the above embodiment, the following improvements are made, the downward pressure structure 30 includes a mounting frame 31, a top cylinder 32 is installed on the top of the mounting frame 31, a mechanical sensor 33 is installed on the piston end of the top cylinder 32, and a lifting plate 34 is installed through the mechanical sensor 33, the lifting plate 34 is vertically slidably installed on the mounting frame 31, a surface pressure platform 35 and a vertical rod 36 are installed on the lifting plate 34, the surface pressure platform 35 is used to press down and fix the compressor end cover, the vertical rod 36 is used to vertically guide the lifting plate 34, and a hollow structure is provided in the middle of the surface pressure platform 35.

[0053] When the compressor end cover surface is pressed down, the mounting frame 31 moves the lifting plate 34 downward through the mechanical sensor 33, and the compressor end cover surface is pressed and fixed on the conveying tooling 10 through the surface pressing platform 35 to prevent the compressor from shifting during subsequent inspections.

[0054] Embodiment 3, based on the above embodiment, the following improvements are made, the pressing and pulling unit includes a lower cylinder 37 installed on the lifting plate 34, the piston end of the lower cylinder 37 is installed with a mechanical sensor 38, and is connected to a detection platform 39 through the mechanical sensor 38, the detection platform 39 is vertically slidably fitted on the mounting frame 31, a pressing platform 395 is installed on the lower surface of the detection platform 39, the pressing platform 395 is used to press down the end face of the main shaft until the main shaft cannot rotate, the upper surface of the pressing platform 395 is a detection plane, and the lower surface is a crimping surface, the crimping surface is used to press down the end face of the main shaft, a through hole is provided in the middle of the detection platform 39 and the pressing platform 395, an axial threaded pulling structure is installed in the through hole, the axial threaded pulling structure is used to axially threadedly connect the main shaft threaded hole and press down the pressing platform 395, so that the two are relatively stationary.

[0055] The lower cylinder 37 drives the detection platform 39 downward through the mechanical sensor 38, and presses down the fixed spindle end face through the pressing platform 395. After the spindle end face is pressed down to a predetermined pressing pressure value, the spindle cannot rotate, and the spindle is pressed down to the lowest axial position. When the axial threaded pulling structure is threadedly connected to the spindle threaded hole, the detection plane of the pressing platform 395 will be pressed tightly, and the axial threaded pulling structure moves together with the pressing platform 395, and the two are in a relatively static state.

[0056] Embodiment 4, based on the above embodiment, the following improvements are made, the axial thread pulling structure includes a driving rod 310, a threaded joint 311 and a rotating assembly, the driving rod 310 vertically passes through the through hole on the detection platform 39, and a threaded joint 311 is installed at the bottom, the threaded joint 311 is located in the through hole of the lower pressing platform 395, the driving rod 310 is provided with a rotating wheel 312, the rotating wheel 312 is installed on the detection platform 39, the lifting plate 34 is provided with a driving motor 313, the driving motor 313 drives the driving disk 314 to rotate, the driving disk 314 drives the rotating wheel 312 to rotate via a belt, the driving rod 310 and the rotating wheel 312 can slide vertically relative to each other without relative rotation.

[0057] The rotary wheel 312 is provided with a spline hole, and the driving rod 310 is provided with a spline structure adapted to the spline hole.

[0058] The driving motor 313 (servo motor) drives the driving disk 314 via the belt and then drives the rotating wheel 312 to rotate. The rotating wheel 312 drives the driving rod 310 to rotate through the spline hole and the spline structure, and then drives the threaded joint 311 to enter or exit the main shaft threaded hole.

[0059] Embodiment 5, based on the above embodiment, the following improvements are made, the detection platform 39 includes a bottom plate 391, a top plate 392 and a side plate 393 connecting the bottom plate 391 and the top plate 392;

[0060] The lower pressing platform 395 is fixed on the lower surface of the bottom plate 391;

[0061] The second mechanical sensor 38 is installed on the upper surface of the top plate 392, and the second mechanical sensor 38 is used to detect the upward pulling force value and the downward pressing force value of the main shaft;

[0062] A guide sleeve 394 is installed on the lower surface of the top plate 392. The guide sleeve 394 is used to limit the top of the driving rod 310 and slide with it to limit the top of the driving rod 310 from swinging during the rotational movement.

[0063] A guide groove is provided on the side plate 393 , and a vertical guide rail 315 adapted to the guide groove is provided on the mounting frame 31 .

[0064] The mechanical sensor 2 38 can effectively overcome the problem that the axial displacement of the piston rod affects the detection accuracy due to the change in the force on the end of the piston rod. This embodiment can effectively overcome this disadvantage and achieve accurate detection.

[0065] Embodiment 6, based on the above embodiment, the following improvements are made: two signal sensors 396 are installed on the upper surface of the bottom plate 391 to detect the initial position and final position signals of the threaded connection. By providing the two signals, it is convenient for the PLC to control the start and stop of the drive motor 313 to control the threaded joint 311 to enter or exit the main shaft threaded hole.

[0066] Embodiment 7, based on the above embodiment, the following improvements are made, the detection unit includes a displacement sensor 341 installed on the lifting plate 34, and the displacement sensor 341 is used to detect the axial displacement of the lower pressing platform 395. After the threaded connector 311 enters the threaded hole of the spindle and presses and fixes the lower pressing platform 395, the three are combined into a whole, and the lower cylinder 37 can pull the spindle, which is convenient for selecting an object to indirectly detect the axial displacement of the spindle.

[0067] Embodiment 8, based on the above embodiment, the following improvements are made: the upper push assembly 20 includes a lifting cylinder 21 and a positioning pin 22, the lifting cylinder 21 is located below the conveying fixture 10 at the detection station, a support 23 is installed on the top of the lifting cylinder 21, and guide rods 24 are vertically installed at the four corners of the support 23, and a positioning pin 22 is provided on the support 23, and the positioning pin 22 is used to support the conveying fixture 10 to separate from the conveying chain. The conveying fixture 10 can be positioned horizontally by the positioning pin 22, and the bottom of the conveying fixture 10 is correspondingly provided with a positioning hole, and the conveying fixture 10 is lifted up and separated from the conveying chain 11 by using the support 23 to realize online detection.

[0068] An online detection method for the axial movement of a compressor main shaft, the detection steps are as follows:

[0069] Compressor delivery:

[0070] The compressor is placed on the conveying tooling 10 and transported to the inspection station via the conveying chain 11. The lifting cylinder 21 drives the support 23 and the positioning pin 22 upward, and the conveying tooling 10 is lifted off the conveying chain 11.

[0071] Compressor end cover compression:

[0072] The top cylinder 32 drives the lifting plate 34 downward through the mechanical sensor 33, and uses the surface pressure platform 35 to press and fix the compressor end cover. The pressure value is 150-190kg, and the pressure value is detected by the mechanical sensor 33;

[0073] Axial movement detection:

[0074] The lower cylinder 37 drives the detection platform 39, the driving motor 313, the driving disk 314, and the rotating wheel 312 to move downward together through the mechanical sensor 2 38, and the pressing platform 395 moves downward to the pressing surface to press the end face of the spindle until it moves downward to a predetermined pressing pressure value, at which time the spindle cannot rotate;

[0075] During the downward movement, the threaded joint 311 abuts against the end of the main shaft and drives the driving rod 310 to move upward relative to the pressing platform 395;

[0076] The driving motor 313 drives the driving disk 314 to rotate, and the driving disk 314 drives the rotating wheel 312 to rotate via the belt, driving the threaded joint 311 to threadably engage with the threaded hole of the spindle, until the threaded joint 311 is pressed onto the detection plane of the lower pressing platform 395, and until a predetermined torque value is reached, the lower pressing platform 395 is pressed between the driving rod 310 and the end face of the spindle;

[0077] The lower cylinder 37 drives the detection platform 39, the lower pressing platform 395 and the threaded joint 311 upward through the mechanical sensor 2 38. When the upper pulling force value is reached, the upper pulling force value and the lower pressing pressure value are both detected by the mechanical sensor 2 38. The displacement sensor is used to detect the axial displacement of the main shaft in the interval from the predetermined lower pressing pressure value to the predetermined upper pulling force value, which is the axial displacement of the lower pressing platform 395.

[0078] The driving motor 313 drives the driving disk 314 to rotate in the opposite direction, the driving rod 310 drives the threaded joint 311 to reversely withdraw from the main shaft threaded hole, the lower cylinder 37 drives the detection table 39 to move upward to the initial position, and the top cylinder 32 drives the lifting plate 34 to move upward to the initial position.

[0079] The above is only a preferred specific implementation of the utility model, but the protection scope of the utility model is not limited to this. The replacement can be a replacement of part of the structure, device, method step, or a complete technical solution. Equivalent replacement or change based on the technical solution and inventive concept of the utility model should be included in the protection scope of the utility model.

Claims

1. A device for detecting axial movement of a compressor main shaft on one side, characterized in that: include: A downward pressing structure (30), the downward pressing structure (30) comprises a mounting frame (31), a top cylinder (32) is mounted on the top of the mounting frame (31), a mechanical sensor (33) is mounted on the piston end of the top cylinder (32), and a lifting plate (34) is mounted through the mechanical sensor (33), the lifting plate (34) is vertically slidably mounted on the mounting frame (31), a surface pressing platform (35) and a vertical rod (36) are mounted on the lifting plate (34), the surface pressing platform (35) is used to press down and fix the compressor end cover, the vertical rod (36) is used to vertically guide the lifting plate (34), and a hollow structure is arranged in the middle of the surface pressing platform (35); A downward pressing and pulling unit is installed on the lifting plate (34), and the downward pressing and pulling unit comprises a downward pressing and pulling unit and a detection unit. The downward pressing and pulling unit is used to press the main shaft downward to a predetermined downward pressing pressure value and pull the main shaft upward to a predetermined upward pulling force value. The detection unit is used to detect the axial displacement of the main shaft in the interval from the predetermined downward pressing pressure value to the predetermined upward pulling force value.

2. A device for detecting axial movement of a compressor main shaft on one side according to claim 1, characterized in that: The pressing and pulling unit comprises a lower cylinder (37) mounted on a lifting plate (34), a piston end of the lower cylinder (37) being mounted with a mechanical sensor 2 (38), and a detection platform (39) being connected via the mechanical sensor 2 (38), the detection platform (39) being vertically slidably fitted on the mounting frame (31), a pressing platform (395) being mounted on the lower surface of the detection platform (39), the pressing platform (395) being used to press down the end face of the main shaft until the main shaft cannot rotate, the upper surface of the pressing platform (395) being a detection plane, and the lower surface being a crimping surface, the crimping surface being used to press down the end face of the main shaft, a through hole being arranged in the middle of the detection platform (39) and the pressing platform (395), an axial threaded pulling structure being mounted in the through hole, the axial threaded pulling structure being used to axially threadedly connect to the threaded hole of the main shaft and press down and tighten the pressing platform (395).

3. The device for detecting axial movement of a compressor main shaft on one side according to claim 2, characterized in that: The axial thread pulling structure comprises a driving rod (310), a threaded joint (311) and a rotating assembly. The driving rod (310) vertically passes through a through hole on a detection platform (39), and a threaded joint (311) is installed at the bottom. The threaded joint (311) is located in a through hole of a lower pressing platform (395). A rotating wheel disc (312) is mounted on the driving rod (310). A driving motor (313) is installed on the lifting plate (34). The driving motor (313) drives the driving disc (314) to rotate. The driving disc (314) drives the rotating wheel disc (312) to rotate via a belt. The driving rod (310) and the rotating wheel disc (312) can slide vertically relative to each other without rotating relative to each other.

4. The device for detecting axial movement of a compressor main shaft on one side according to claim 3 is characterized in that: The rotary wheel disc (312) is provided with a spline hole, and the driving rod is provided with a spline structure adapted to the spline hole.

5. The device for detecting axial movement of a compressor main shaft on one side according to claim 4, characterized in that: The detection platform (39) includes a bottom plate (391), a top plate (392), and a side plate (393) connecting the bottom plate (391) and the top plate (392); The lower pressing platform (395) is fixed on the lower surface of the bottom plate (391); The second mechanical sensor (38) is installed on the upper surface of the top plate (392), and the second mechanical sensor (38) is used to detect the upward pulling force value and the downward pressing force value of the main shaft; A guide sleeve (394) is installed on the lower surface of the top plate (392), and the guide sleeve (394) is used to limit the top of the driving rod (310) and slide with it; A guide groove is provided on the side plate (393), and a vertical guide rail (315) adapted to the guide groove is provided on the mounting frame (31).

6. The device for detecting axial movement of a compressor main shaft on one side according to claim 5, characterized in that: Two signal sensors (396) are installed on the upper surface of the bottom plate (391) for detecting the initial position and final position signals of the threaded connection.

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