Multi-point online intelligent detecting and straightening device and method for straightness of shafts

Abstract

The invention provides a shaft straightness multi-point online intelligent detecting and straightening device and method. The shaft straightness multi-point online intelligent detecting and straightening device comprises a clamping power device, a straightening device arranged above a shaft part, a control system and a workbench arranged below the shaft part. Detection and straightening of the shaft parts can be completed on one device, intelligent operation is achieved, and the problems that in the prior art, detection and straightening of the shaft parts are conducted through different devices, the production efficiency is low, and the product quality is poor are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of large shaft parts detection, and in particular to a device and method for multi-point online intelligent detection and straightening of shaft straightness. Background Art

[0002] With the advancement of mechanical technology, large shaft parts are being used more and more widely. In the fields of aerospace, shipbuilding, rail transit, etc., the quality requirements for shaft parts are getting higher and higher. Automatic straightening machines are now mostly used to straighten shaft parts. In addition, the curvature of shaft parts needs to be tested separately. The detection and straightening are carried out on two different devices respectively, which can easily cause large correction errors. In order to avoid product quality problems, repeated detection and straightening are often used to meet standard requirements, which results in low production efficiency and high cost. Summary of the invention

[0003] The present invention provides a device and method for multi-point online intelligent detection and straightening of shaft straightness, which completes the detection and straightening of shaft parts on one device and realizes intelligent operation, thus solving the problems in the prior art that the detection and straightening of shaft parts are carried out by different devices respectively, resulting in low production efficiency and poor product quality.

[0004] The first object of the present invention is to provide a multi-point online intelligent detection and straightening device for shaft straightness, comprising a clamping power device, a straightening device arranged above the shaft parts, a control system and a workbench arranged below the shaft parts.

[0005] The clamping power device comprises a rotary chuck for clamping shaft parts, a motor and a spindle connected to the motor, wherein the rotary chuck is arranged at the other end of the spindle opposite to the motor;

[0006] The straightening device comprises a hydraulic press and an arc-shaped straightening hydraulic head, wherein the piston rod of the hydraulic press controls the up and down movement of the arc-shaped straightening hydraulic head;

[0007] The workbench is provided with a lifting roller device, an arc straightening pressure bearing seat and a detection device. The arc straightening pressure bearing seat is fixed on the workbench and is used to bear the pressure of shaft parts; the lifting roller device is arranged on the workbench in a liftable manner, and a telescopic member for controlling the lifting and lowering of the lifting roller device is arranged at the lower end thereof; the detection device is driven by the pneumatic cylinder to perform lifting and lowering movements, and the lifting roller device includes a roller that rotates with the shaft parts, and the rollers have two;

[0008] The control system includes a straightening machine pressure head control system and a multi-point detection system that are interconnected. The multi-point detection system connects the detection device, the lifting roller device, the telescopic member, and the clamping power device. The straightening machine pressure head control system connects the straightening device and the clamping power device.

[0009] Furthermore, a support base for supporting the clamping power device is arranged on the workbench, a first compression cylinder for driving the support base to move is arranged on one side of the support base, and a second compression cylinder for supporting the lifting and lowering of the clamping power device is also fixed on the support base.

[0010] Furthermore, the main shaft is connected to the motor via a bearing seat, a load-bearing ring is slidably mounted on the main shaft, and the load-bearing ring is fixedly connected to the bearing seat.

[0011] Furthermore, the interior of the load-bearing ring is a hollow structure, one end of the load-bearing ring is fixed on the bearing seat, and a through hole is formed in the middle thereof for the main shaft to pass through, and the other end of the load-bearing ring is slidably connected to the rotating chuck.

[0012] Furthermore, the rotary chuck includes a connecting member, a clamping member fixedly connected to the connecting member, and a clamping head, the connecting member is connected to the main shaft sliding key, one end of the clamping head is rotatably fixed on the main shaft, and the middle part is rotatably connected to the clamping member through a connecting shaft; a pressure-bearing member is fixed on the main shaft, the movable end of the third compression cylinder is connected to the pressure-bearing member, and the fixed end is connected to the connecting member.

[0013] Furthermore, the clamping head includes a fixed end, a rotating end and a clamping portion for clamping shaft parts, the fixed end and the rotating end are an integral bent structure, the end of the fixed end can be rotatably fixed to the end of the main shaft, the portion where the fixed end and the rotating end are connected forms a connecting hole, the connecting shaft passes through the connecting hole and is connected to the clamping fixture, and the clamping portion can be rotatably fixed to one end of the rotating end.

[0014] Furthermore, there are multiple arc straightening hydraulic heads.

[0015] Furthermore, the lifting roller device includes a telescopic member fixed on the workbench, the top of the telescopic member is connected to a roller groove for carrying a roller, and the roller is arranged in the roller groove.

[0016] Furthermore, the workbench is also provided with limit blocks, and the limit blocks are arranged on both sides of the roller groove.

[0017] Furthermore, the detection device includes a connecting rod, a pneumatic cylinder is arranged below the connecting rod to drive the connecting rod to move up and down, and a displacement sensor is also fixed on the connecting rod.

[0018] Furthermore, the contact surfaces of the arc-straightening hydraulic head, the arc-straightening pressure seat and the shaft parts are arc-shaped surfaces.

[0019] Furthermore, the motor is a servo reduction motor.

[0020] The second object of the present invention is to provide a method for multi-point online intelligent detection and straightening of shaft straightness, comprising the following steps:

[0021] 1) Parts installation: hoist the heat-treated shaft parts onto the arc-shaped straightening pressure-bearing seat, and clamp one end of the part with a rotary chuck;

[0022] 2) Parts suspended in the air: The multi-point detection system controls the clamping power device and the lifting roller device to rise, so that the parts leave the arc straightening pressure seat and are suspended in the air;

[0023] 3) Intelligent detection: Start the motor to rotate the part, and the detection device rises and contacts the surface of the part under the drive of the pneumatic cylinder. The detection device continuously moves radially along with the part. Every time the part rotates one degree, the displacement sensor on the detection device records the displacement coordinates of the point. The displacement sensor transmits multiple displacement coordinates formed by the radial runout data to the multi-point detection system;

[0024] 4) Data processing: The multi-point detection system fits the collected detection points, coordinate data and rotation angle data to obtain the contour curve, obtain the maximum deformation of the part at each position, and transmit the data to the straightening machine pressure head control system; the straightening machine pressure head control system calculates the deformation data, combined with the heat treatment data and part material information, using the system preset algorithm to obtain the arc straightening hydraulic head pressing stroke, pressing position, and pressure size data;

[0025] 5) Deformation determination: Determine the deformation data obtained in step 4). If the deformation data meets the standard requirements, stop working; if it does not meet the standard requirements, perform step 6) straightening operation on the parts.

[0026] 6) Part straightening: turn off the motor, and at the same time lower the clamping power device and the lifting roller device so that the top of the lifting roller device is flush with the top of the arc straightening pressure seat, start the hydraulic press, and move the arc straightening hydraulic head downward to cooperate with the arc straightening pressure seat to apply pressure to the parts, straighten the points that need to be straightened, until all straightening points are straightened, and turn off the hydraulic press; repeat 2)-5) operations.

[0027] Furthermore, the least square method is used for data fitting of the multi-point detection system.

[0028] Compared with the prior art, the beneficial technical effect of the present invention is that the present invention realizes the straightness detection and straightening of shaft parts with one device, which avoids the measurement errors caused by the movement of shaft parts, poor straightening accuracy and other problems compared with the prior art which uses a straightness detection device and a straightening machine for separate operations.

[0029] The present invention uses intelligent straightness detection, and uses the connecting rod to move up and down on the pneumatic cylinder to accurately record the displacement of the shaft parts when they rotate, and assists in multi-dimensional detection of the rotation angle and position, so that the detection data is more accurate and the measurement error is reduced. The shaft parts are lifted and lowered by the lifting roller device, so that the parts are suspended during detection, avoiding the influence of other factors on the detection data, and are put back to the arc straightening pressure seat during straightening, so as to better realize the straightening operation.

[0030] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those of ordinary skill in the art. The accompanying drawings are only used for the purpose of illustrating the preferred embodiment and are not considered to be limitations of the present invention. In addition, the same reference symbols are used to represent the same components throughout the accompanying drawings.

[0032] Figure 1 The present invention is a schematic structural diagram of a device and method for multi-point online intelligent detection and straightening of shaft straightness.

[0033] Figure 2 It is a top view of a device in a device and method for multi-point online intelligent detection and straightening of shaft straightness of the present invention.

[0034] Figure 3 It is a structural schematic diagram of a clamping power device in a multi-point online intelligent detection and straightening device and method for shaft straightness of the present invention.

[0035] Figure 4 It is a side view of a device in a device and method for multi-point online intelligent detection and straightening of shaft straightness of the present invention.

[0036] Figure 5 For the present invention Figure 1 Cross-sectional view along the HH direction.

[0037] Figure 6 The present invention discloses a detection and straightening flow chart of a device and method for multi-point online intelligent detection and straightening of shaft straightness.

[0038] In the attached picture:

[0039] 1 is the motor, 2 is the main shaft, 3 is the pressure-bearing part, 4 is the third compression cylinder, 5 is the connecting part, 6 is the clamping fixing part, 7 is the clamping head, 8 is the arc straightening hydraulic head, 9 is the supporting seat, 10 is the first compression cylinder, 11 is the load-bearing ring, 12 is the connecting rod, 13 is the displacement sensor, 14 is the lifting roller device, 15 is the arc straightening pressure bearing seat, 16 is the multi-point detection system, 17 is the workbench, 18 is the second compression cylinder, 19 is the bearing seat, 20 is the fixed end, 21 is the rotating end, 22 is the clamping part, 23 is the connecting hole, 24 is the clamping power device, 25 is the telescopic part, 26 is the roller groove, 27 is the roller, 28 is the limit block, and 29 is the pneumatic cylinder. DETAILED DESCRIPTION

[0040] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0041] In the description of the present invention, it is necessary to understand that the terms "above", "below", "up and down", "right", "middle", "left", "left and right", "top", etc. indicate directions or positional relationships based on directions or positional relationships during use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the scope of protection of the present invention.

[0042] A multi-point online intelligent detection and straightening device for shaft straightness, comprising a clamping power device 24, a straightening device arranged above the shaft part, a control system and a workbench 17 arranged below the shaft part.

[0043] The clamping power device 24 includes a rotary chuck for clamping shaft parts, a motor 1 and a spindle 2 connected to the motor 1, and the rotary chuck is arranged at the other end of the spindle 2 opposite to the motor 1;

[0044] The straightening device includes a hydraulic press and an arc straightening hydraulic head 8, and the piston rod of the hydraulic press controls the up and down movement of the arc straightening hydraulic head 8;

[0045] The workbench 17 is provided with a lifting roller device 14, an arc straightening pressure bearing seat 15 and a detection device. The arc straightening pressure bearing seat 15 is fixed on the workbench 17 and is used to bear the pressure of shaft parts; the lifting roller device 14 is arranged on the workbench 17 in a lifting manner, and a telescopic member 25 for controlling the lifting and lowering of the lifting roller device 14 is arranged at its lower end; the detection device is driven by the pneumatic cylinder 29 to perform lifting and lowering movements, and the lifting roller device 14 includes a roller 27 that rotates with the shaft parts, and the roller 27 has two rollers;

[0046] The control system includes a straightening machine pressure head control system and a multi-point detection system 16 which are interconnected. The multi-point detection system 16 connects the detection device, the lifting roller device 14, the telescopic member 25, and the clamping power device 24. The straightening machine pressure head control system connects the straightening device and the clamping power device 24.

[0047] The present invention clamps shaft parts through the clamping power device 24, and supports the shaft parts on the arc-shaped straightening pressure seat 15. During detection, the lifting roller device 14 makes the parts rise and hang in the air, avoiding the influence of other components on the detection results during detection. The straightening point is located through the positioning point and the rotation angle, and the straightening degree of the positioning point is detected. The detection result is accurate, and the parts are directly straightened after the detection without moving the parts, thereby ensuring the accuracy of the straightening.

[0048] A support base 9 for supporting the clamping power device 24 is provided on the workbench 17. A first compression cylinder 10 for pushing the support base 9 to move is provided on one side of the support base 9. A second compression cylinder 18 for supporting the lifting and lowering of the clamping power device 24 is also fixed on the support base 9. The first compression cylinder 10 is used to fine-tune the horizontal position of the clamping power device 24 when the parts to be inspected are changed, so that the equipment can be used for inspection and straightening of parts of various models. The second compression cylinder 18 is used to support the lifting and lowering of the clamping power device 24. When inspection is required, it rises simultaneously with the lifting roller device 14 to keep the clamping power device 24 level with the parts, and then descends synchronously with the lifting roller device 14 after the inspection is completed.

[0049] The main shaft 2 is connected to the motor 1 through the bearing seat 19. A bearing ring 11 is slidably mounted on the main shaft 2, and the bearing ring 11 is fixedly connected to the bearing seat 19. The bearing ring 11 is used to support the main shaft 2 on the one hand, and fix the motor 1 and the support seat 9 on the other hand. The bearing ring 11 is mounted on the main shaft 2 and slidably connected to the main shaft 2. When the support seat 9 is supported on the bearing ring 11, the rotation of the main shaft 2 is not affected.

[0050] The inside of the load-bearing ring 11 is a hollow structure. One end of the load-bearing ring 11 is fixed on the bearing seat 19, and a through hole is formed in the middle thereof for the spindle 2 to pass through. The other end of the load-bearing ring 11 is slidably connected to the rotating chuck. The hollow structure formed between the load-bearing ring 11 and the spindle 2 is used to accommodate the components that drive the rotating chuck to clamp and move.

[0051] The rotary chuck includes a connecting member 5, a clamping member 6 fixedly connected to the connecting member 5, and a clamping head 7. The connecting member 5 is connected to the main shaft 2 by a sliding key. One end of the clamping head 7 is rotatably fixed to the main shaft 2, and the middle part is rotatably connected to the clamping member 6 through a connecting shaft. A pressure-bearing member 3 is fixed to the main shaft 2, and the movable end of the third compression cylinder 4 is connected to the pressure-bearing member 3, and the fixed end 20 is connected to the connecting member 5. The third compression cylinder 4 is fixedly connected to the connecting member 5. When it is necessary to clamp a part, the third compression cylinder 4 is stretched, one end of which is fixedly connected to the pressure-bearing member 3, and the other end moves to the right with the stretching of the third compression cylinder 4, and at the same time drives the connecting member 5 to move to the right. The connecting member 5 is connected to the main shaft 2 by a sliding key, so that the connecting member 5 can slide on the main shaft 2 while rotating with the main shaft 2. When the third compression cylinder 4 compresses the connecting member 5 to move to the right, the connecting member 5 slides to the right relative to the main shaft 2, and at the same time drives the clamping fixture 6 to move to the right. Under the push of the clamping fixture 6, the clamping head 7 rotates around the part connected to the main shaft 2 under the push to the right, thereby clamping the part. When the part needs to be released, the third compression cylinder 4 is compressed, driving the connecting member 5 to slide to the left, so that the clamping head 7 rotates in the opposite direction to release the part. The clamping of the part is controlled by the drive of the third compression cylinder 4, and the clamping pressure can be controlled within 0.1MPa.

[0052] The clamping head 7 includes a fixed end 20, a rotating end 21 and a clamping portion 22 for clamping shaft parts. The fixed end 20 and the rotating end 21 are an integral bent structure. The end of the fixed end 20 can be rotatably fixed to the end of the main shaft 2. The portion where the fixed end 20 and the rotating end 21 are connected forms a connecting hole 23. The connecting shaft passes through the connecting hole 23 and is connected to the clamping fixture 6. The clamping portion 22 can be rotatably fixed to one end of the rotating end 21. The fixed end 20 rotates around the end connected to the main shaft 2, and the rotating end 21 moves driven by the fixed end 20. When clamping, the clamping fixture 6 gives the connecting shaft a rightward force, and the fixed end 20 rotates rightward around one end of the main shaft 2 under the rightward force, so that the distance between the rotating ends 21 is reduced until the clamping portion 22 contacts and clamps the part. When releasing the part, the clamping fixture 6 applies a leftward pulling force to the connecting shaft, and the fixed end 20 rotates leftward around one end of the main shaft 2 under the leftward pulling force, so that the distance between the rotating ends 21 increases until the clamping portion 22 is separated from the part. In a preferred embodiment, an elastic pad is fixed on the clamping portion 22.

[0053] In order to improve the straightening effect, there are multiple arc-shaped straightening hydraulic heads 8.

[0054] The lifting roller device 14 includes a telescopic member 25 fixed on the workbench 17, and a roller groove 26 for carrying a roller 27 is connected to the top of the telescopic member 25, and the roller 27 is arranged in the roller groove 26. There are two rollers 27, which are arranged in the roller groove 26. When the shaft parts rotate, the two rollers 27 are driven by the shaft parts to passively rotate, which reduces the friction between the shaft parts and the support parts when rotating, avoids the influence of factors such as friction on the straightening test results, and the test results are more accurate.

[0055] In order to prevent the roller groove 26 from shifting, a limit block 28 is further provided on the workbench 17 . The limit blocks 28 are provided on both sides of the roller groove 26 . When the lifting roller device 14 moves up and down, the roller groove 26 moves up and down along the inner wall of the limit block 28 .

[0056] In order to more conveniently detect the straightness of shaft parts, the detection device includes a connecting rod 12, a pneumatic cylinder 29 is arranged below the connecting rod 12 to drive the connecting rod 12 to move up and down, and a displacement sensor 13 is also fixed on the connecting rod 12. When detection is required, the pneumatic cylinder 29 drives the connecting rod 12 to rise, so that the connecting rod 12 contacts the shaft parts, the displacement sensor 13 moves upward with the connecting rod 12, and the pneumatic cylinder 29 stops moving. When the shaft parts rotate, when the shaft parts are bent, the shaft parts will jump during rotation. Due to the existence of the pneumatic cylinder 29, the shaft parts will jump to the connecting rod 12 to generate pressure, so that the connecting rod 12 jumps up and down with the shaft parts, and the displacement sensor 13 records the displacement value during the up and down jump, and the recorded data is transmitted to the multi-point detection system 16 for processing. In an embodiment of the present invention, there are multiple detection devices, and multiple displacement sensors 13 are arranged in a matching manner. Through the collection of multiple sets of data, the detection results are more accurate. In a preferred embodiment, there are 7 detection devices. When working, the displacement sensor 13 collects one data for every rotation of one degree at most. Each displacement sensor 13 collects at least 360 sampling data for every rotation of the part.

[0057] In order to make the arc straightening hydraulic head 8, the arc straightening pressure seat 15 and the shaft parts contact better, the contact surface between the arc straightening hydraulic head 8, the arc straightening pressure seat 15 and the shaft parts is an arc surface.

[0058] Motor 1 is a servo reduction motor, the rotation speed can be adjusted as needed, and the rotation angle can be accurately controlled within 0.05 degrees.

[0059] A multi-point online intelligent detection and straightening method for shaft straightness, comprising the following steps:

[0060] 1) Parts installation: hoist the heat-treated shaft parts onto the arc-shaped straightening pressure-bearing seat, and clamp one end of the part with a rotary chuck;

[0061] 2) Parts suspended in the air: The multi-point detection system 16 controls the clamping power device 24 and the lifting roller device 14 to rise, so that the parts leave the arc straightening pressure seat 15 and are suspended in the air;

[0062] 3) Intelligent detection: Start the motor 1 to rotate the part, and the detection device rises and contacts the surface of the part under the drive of the pneumatic cylinder 29. The detection device continuously radially jumps along with the part. Every time the part rotates one degree, the displacement sensor 13 on the detection device records the displacement coordinates of the point. The displacement sensor 13 transmits multiple displacement coordinates formed by radial jump data to the multi-point detection system 16;

[0063] 4) Data processing: The multi-point detection system 16 fits the collected detection points, coordinate data and rotation angle data to obtain the contour curve, obtain the maximum deformation of the part at each position, and transmit the data to the straightening machine pressure head control system; the straightening machine pressure head control system calculates the deformation data, combined with the heat treatment data and part material information, using the system preset algorithm to obtain the downward pressing stroke, pressing position and pressure size data of the arc straightening hydraulic head 8;

[0064] 5) Deformation determination: Determine the deformation data obtained in step 4). If the deformation data meets the standard requirements, stop working; if it does not meet the standard requirements, perform step 6) straightening operation on the parts.

[0065] 6) Part straightening: turn off the motor 1, and at the same time lower the clamping power device 24 and the lifting roller device 14, so that the top of the lifting roller device 14 is flush with the top of the arc straightening pressure seat 15, start the hydraulic press, and the arc straightening hydraulic head 8 moves downward to cooperate with the arc straightening pressure seat 15 to apply pressure to the parts, straighten the points that need to be straightened, until all straightening points are straightened, and turn off the hydraulic press; repeat 2)-5) operations.

[0066] The data fitting of the multi-point detection system 16 adopts the least square method.

[0067] The multi-point detection system 16 of the present invention establishes a straightening model based on the collected data, based on the elastic-plastic theory and combined with formulas, and then uses linear regression, neural network and other algorithms in the straightening machine pressure head control system to achieve accurate calculation and prediction of the downward pressure, combined with various process parameters in the production process, to achieve information management of the production process.

[0068] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0069] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation modes, which are merely illustrative rather than restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are within the protection of the present invention.

Claims

1. A multi-point online intelligent detection and straightening device for shaft straightness, characterized by: It includes a clamping power device, a straightening device arranged above the shaft parts, a control system and a workbench arranged below the shaft parts. The clamping power device comprises a rotary chuck for clamping shaft parts, a motor and a spindle connected to the motor, wherein the rotary chuck is arranged at the other end of the spindle opposite to the motor; The straightening device comprises a hydraulic press and an arc-shaped straightening hydraulic head, wherein the piston rod of the hydraulic press controls the up and down movement of the arc-shaped straightening hydraulic head; The workbench is provided with a lifting roller device, an arc straightening pressure bearing seat and a detection device. The arc straightening pressure bearing seat is fixed on the workbench and is used to bear the pressure of shaft parts; the lifting roller device is arranged on the workbench in a liftable manner, and a telescopic member for controlling the lifting and lowering of the lifting roller device is arranged at the lower end thereof; the detection device is driven by the pneumatic cylinder to perform lifting and lowering movements, and the lifting roller device includes a roller that rotates with the shaft parts, and the rollers have two; The control system includes a straightening machine pressure head control system and a multi-point detection system that are interconnected. The multi-point detection system connects the detection device, the lifting roller device, the telescopic member, and the clamping power device. The straightening machine pressure head control system connects the straightening device and the clamping power device.

2. A multi-point online intelligent detection and straightening device for shaft straightness as claimed in claim 1, characterized in that: A support base for supporting the clamping power device is arranged on the workbench, a first compression cylinder for pushing the support base to move is arranged on one side of the support base, and a second compression cylinder for supporting the lifting and lowering of the clamping power device is also fixed on the support base.

3. The multi-point online intelligent detection and straightening device for shaft straightness as claimed in claim 1, characterized in that: The main shaft is connected to the motor via a bearing seat, a load-bearing ring is slidably sleeved on the main shaft, and the load-bearing ring is fixedly connected to the bearing seat.

4. A multi-point online intelligent detection and straightening device for shaft straightness as claimed in claim 3, characterized in that: The interior of the load-bearing ring is a hollow structure. One end of the load-bearing ring is fixed on the bearing seat, and a through hole is formed in the middle thereof for the main shaft to pass through. The other end of the load-bearing ring is slidably connected to the rotating chuck.

5. The multi-point online intelligent detection and straightening device for shaft straightness as claimed in claim 1, characterized in that: The rotary chuck includes a connecting part, a clamping fixing part fixedly connected to the connecting part, and a clamping head, the connecting part is connected to the main shaft sliding key, one end of the clamping head is rotatably fixed on the main shaft, and the middle part is rotatably connected to the clamping fixing part through a connecting shaft; a pressure-bearing part is fixed on the main shaft, the movable end of the third compression cylinder is connected to the pressure-bearing part, and the fixed end is connected to the connecting part.

6. The multi-point online intelligent detection and straightening device for shaft straightness as claimed in claim 1, characterized in that: The lifting roller device comprises a telescopic member fixed on the workbench, the top of the telescopic member is connected with a roller groove for carrying a roller, and the roller is arranged in the roller groove.

7. A multi-point online intelligent detection and straightening device for shaft straightness as claimed in claim 6, characterized in that: The workbench is also provided with limit blocks, and the limit blocks are arranged on both sides of the roller groove.

8. The multi-point online intelligent detection and straightening device for shaft straightness as claimed in claim 1, characterized in that: The detection device comprises a connecting rod, a pneumatic cylinder for driving the connecting rod to move up and down is arranged below the connecting rod, and a displacement sensor is also fixed on the connecting rod.

9. A detection and straightening method according to the multi-point online intelligent detection and straightening device for shaft straightness according to any one of claims 1 to 8, comprising the following steps: 1) Parts installation: hoist the heat-treated shaft parts onto the arc-shaped straightening pressure-bearing seat, and clamp one end of the part with a rotary chuck; 2) Parts suspended in the air: The multi-point detection system controls the clamping power device and the lifting roller device to rise, so that the parts leave the arc straightening pressure seat and are suspended in the air; 3) Intelligent detection: Start the motor to rotate the part, and the detection device rises and contacts the surface of the part under the drive of the pneumatic cylinder. The detection device continuously moves radially along with the part. Every time the part rotates one degree, the displacement sensor on the detection device records the displacement coordinates of the point. The displacement sensor transmits multiple displacement coordinates formed by the radial runout data to the multi-point detection system; 4) Data processing: The multi-point detection system fits the collected detection points, coordinate data and rotation angle data to obtain the contour curve, obtain the maximum deformation of the part at each position, and transmit the data to the straightening machine pressure head control system; the straightening machine pressure head control system calculates the deformation data, combined with the heat treatment data and part material information, using the system preset algorithm to obtain the arc straightening hydraulic head pressing stroke, pressing position, and pressure size data; 5) Deformation determination: Determine the deformation data obtained in step 4). If the deformation data meets the standard requirements, stop working; if it does not meet the standard requirements, perform step 6) straightening operation on the parts. 6) Part straightening: turn off the motor, and at the same time lower the clamping power device and the lifting roller device so that the top of the lifting roller device is flush with the top of the arc straightening pressure seat, start the hydraulic press, and move the arc straightening hydraulic head downward to cooperate with the arc straightening pressure seat to apply pressure to the parts, straighten the points that need to be straightened, until all straightening points are straightened, and turn off the hydraulic press; repeat 2)-5) operations.

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