Automatic submersible motor stator straightening device and method

Abstract

The invention discloses an automatic submersible motor stator straightening device, which comprises a rotary supporting mechanism, a traction mechanism, a stretching and lifting mechanism, a translation mechanism and a control system, and is characterized in that the rotary supporting mechanism is used for supporting the periphery of a stator and driving the stator to rotate; the traction mechanism is used for installing the detection rod and dragging the detection rod to stretch into the stator to move in the axial direction of the stator. The stretching and lifting mechanism is used for driving the detection rod to move up and down to align the center of the detection rod to the stator center; the translation mechanism is arranged on one side of the rotary supporting mechanism, a robot is arranged on the translation mechanism, the direction in which the translation mechanism drives the robot to move is parallel to the axial direction of the stator, and a spray burning assembly and a cooling assembly are arranged on the robot so as to straighten the stator; the control system is in communication connection with the rotary supporting mechanism, the traction mechanism, the detection bar, the stretching and lifting mechanism, the translation mechanism and the robot. Intelligent equipment is used, manual direct operation is not needed, the working intensity is reduced, and the product straightening precision is improved.

Description

Technical Field

[0001] The invention relates to the technical field of submersible motor stator straightening, and in particular to an automatic submersible motor stator straightening device and method. Background Art

[0002] Submersible motors are used in industries such as oil and gas. They are special motors used for underground oil collection. Their function is to connect with submersible electric pumps to drive the electric pumps to suck oil from below a kilometer to the ground. Since the diameter of general oil wells is small, the outer diameter of the motor is limited. Therefore, the capacity can only be increased by increasing the length of the motor, and the submersible motor is made into a slender type. Poor straightness of the submersible motor stator will have an adverse effect on the performance and service life of the submersible motor. First, it may cause increased vibration and noise of the motor and reduce the stability of operation. Secondly, poor straightness may also cause problems such as bearing wear and seal failure, thereby affecting the overall performance and reliability of the motor. Therefore, it is necessary to detect and adjust the straightness of the motor stator during the manufacturing process of the submersible motor.

[0003] The existing technology adopts the method of manual detection conditions. First, the position of the copper sheet and the patch needs to be determined, and the length of each section of the iron sheet and the copper sheet of the stator core is marked on the outer circle of the corresponding housing manually using a ruler and chalk according to the size of the stator core drawing.

[0004] Connect the side head of the straightness measuring instrument to the measuring rod and push it into the inner hole of the iron core. According to the stator core drawing, push the probe into 1 / 2 of the core length. At this time, the measured position is the midpoint of the core. Manually rotate the stator core shell for one circle, observe the micrometer runout value transmitted by the straightness measuring instrument on the external display, and use chalk to record the runout value at the corresponding position. Then push the probe into 1 / 2 of the copper core length. At this time, the measured position is the midpoint of the copper core. Use the same method to record the runout value. And so on, measure the center runout values ​​of all iron segments and copper segments.

[0005] Pull out the side head of the straightness measuring instrument and use the heating method to straighten it. Heat each marked point in turn with a gas welding gun, and then quickly cool the heated point with water. This step requires two people to assist in the operation, one person holding the gas welding gun and the other holding the water pipe, working alternately. Judge the heating time and flame size based on the workers' experience. After completing the heating and straightening process, it is necessary to recheck the runout value of each point. If the value is outside the qualified range, it is necessary to reheat and straighten until the test is qualified.

[0006] This method requires two people to work at the same time, repeatedly checking and straightening the steel bars, which is inefficient and labor-intensive. In addition, this method is highly dependent on the workers' experience, and the burning time is not certain each time. Therefore, the pass rate of straightening is difficult to control, which is not conducive to evaluation, standardization, and mass production. Summary of the invention

[0007] The purpose of the present application is to provide an automatic submersible motor stator straightening device and method to solve the problems raised in the above background technology.

[0008] To achieve the above objectives, this application provides the following technical solutions:

[0009] An automatic submersible motor stator straightening device, comprising:

[0010] A rotating support mechanism, the rotating support mechanism is used to support the outer periphery of the stator and drive the stator to rotate;

[0011] A traction mechanism, the traction mechanism is arranged corresponding to one end surface of the stator, the traction mechanism is used to install a detection rod and drag the detection rod into the stator to move along the axial direction of the stator, and the detection rod is used to detect the inner hole runout value of the iron core segment and the copper segment;

[0012] An extension and lifting mechanism, the extension and lifting mechanism is used to drive the detection rod to move up and down so that the center of the detection rod is aligned with the center of the stator;

[0013] A translation mechanism, the translation mechanism is arranged on one side of the rotating support mechanism, a robot is arranged on the translation mechanism, the translation mechanism drives the robot to move in a direction parallel to the axial direction of the stator, and a spraying component and a cooling component are arranged on the robot to perform a straightening operation on the stator;

[0014] A control system is respectively connected to the rotating support mechanism, the traction mechanism, the detection rod, the lifting mechanism, the translation mechanism and the robot for communication.

[0015] Furthermore, the rotating support mechanism includes a bracket, a roller and a rotating motor, a plurality of the brackets are arranged at intervals along the axial direction of the stator, each of the brackets is symmetrically provided with two of the rollers corresponding to the outer circumference of the stator, and each of the brackets is symmetrically provided with two of the rollers corresponding to the outer circumference of the stator, and the rotating motor drives the rollers to rotate through a belt transmission structure.

[0016] Furthermore, the traction mechanism includes a drag chain and a traction motor. The traction motor is arranged on a side of the detection rod away from the rotating support mechanism. The traction motor is used to push the drag chain to move. The detection rod is installed on the moving end of the drag chain. A data cable is provided inside the drag chain. Both ends of the data cable are respectively communicated with the detection rod and the control system.

[0017] Furthermore, the lifting mechanism includes a lifting motor, a screw rod and a lifting platform, the screw rod is vertically arranged, the lifting platform is threadedly connected to the screw rod, the lifting motor is connected to the screw rod, the lifting platform is arranged between the traction motor and the stator, and the lifting platform is located below the drag chain.

[0018] Furthermore, the spraying assembly includes an igniter and an acetylene gun. The igniter is arranged on a side of the robot close to the lifting mechanism through a bracket, and the acetylene gun is arranged at the moving end of the robot.

[0019] Furthermore, the bracket is tilted in a direction away from the robot.

[0020] Furthermore, the cooling assembly includes a cooling pipe, and the cooling pipe is arranged at the moving end of the robot.

[0021] Furthermore, it also includes a first encoder and a second encoder, the first encoder is arranged below the stator close to the extension mechanism, the front end of the stator presses the first encoder, the first encoder is used to monitor the rotation angle of the stator, and the second encoder is arranged on the side of the extension mechanism away from the stator, and the second encoder is used to monitor the depth distance of the detection rod entering the inner hole of the stator.

[0022] A method for the aforementioned automatic submersible motor stator straightening device comprises the following steps:

[0023] The motor stator is manually placed on the rotating support structure, the front end of the stator presses the first encoder, and the second encoder detects the distance between the stator end faces;

[0024] Manually install the corresponding detection rod to the moving end of the drag chain according to the stator specifications and models;

[0025] The lifting mechanism is lifted and lowered according to the stator specifications until the center of the detection rod is flush with the center of the stator;

[0026] The traction mechanism pushes the drag chain to drive the probe rod forward, and the specified forward distance is obtained by the previously detected stator end face distance;

[0027] According to the specified forward distance, the probe rod is made to just reach the middle position of the first core segment;

[0028] The rotating motor drives the roller to rotate, and the roller drives the stator to rotate through friction. The detection rod begins to detect the inner hole of the core segment for one circle, detects the runout value, and determines whether the runout range is qualified. If it is unqualified, the coordinates of the highest bending point and the rotation angle are recorded;

[0029] After the rotation is completed, continue to move forward to the center section of the copper sheet and repeat the previous process to detect the runout value; after that, the detection method of all core sections and copper segments is the same;

[0030] After the detection is completed, the probe rod is retracted; the control system rotates the highest point of the first bend to the top for spraying according to the records and algorithms; the robot moves to the spraying point, changes its posture, aligns the acetylene gun with the igniter, and moves to the highest point of the first bend for spraying. After the burning is completed, the robot changes its posture, aligns the cooling pipe with the surface of the stator core being sprayed, and performs water cooling;

[0031] After the first stage of combustion is completed, the stator rotates to the highest point of the second bend and rotates upward. The robot moves to the highest point of the second bend for spraying and water cooling. After all points are burned, the robot returns to the origin and the detection rod begins to retest to determine whether the runout range is qualified. If it is unqualified, the coordinates of the highest point of the bend and the rotation angle are recorded;

[0032] After all points are retested, the detection rod returns to the origin. If unqualified, they are sprayed again, water-cooled, and retested until they are qualified.

[0033] In summary, the technical effects and advantages of the present invention are as follows: the present invention uses intelligent equipment, does not require direct manual operation, reduces work intensity, and improves product straightening accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0035] Figure 1 It is a structural schematic diagram of an automatic submersible motor stator straightening device in one embodiment of the present invention;

[0036] Figure 2 It is a structural schematic diagram of a rotary support mechanism in one embodiment of the present invention;

[0037] Figure 3 It is a schematic structural diagram of a traction mechanism and an extension mechanism in one embodiment of the present invention;

[0038] Figure 4 This is a schematic diagram of the structure of a robot in one embodiment of the present invention;

[0039] Figure 5 The figure is a flow chart of a method according to an embodiment of the present invention.

[0040] Among them: 1. water tank; 2. stator; 3. rotating support mechanism; 4. detection rod; 5. drag chain; 6. display; 7. control cabinet; 8. drag chain pipeline; 9. lifting mechanism; 10. robot; 11. track; 12. oxygen acetylene valve; 13. rotating motor; 14. transmission connecting rod; 15. igniter; 16. cooling pipe; 17. acetylene gun; 18. first encoder; 19. second encoder; 20. traction motor; 21. screw; 22. lifting platform; 23. roller; 24. belt drive structure. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0043] This embodiment provides an automatic submersible motor stator straightening device, such as Figure 1-4 As shown, it includes a rotating support mechanism 3, a traction mechanism, a lifting mechanism 9, a translation mechanism and a control system. The rotating support mechanism is used to support the outer periphery of the stator 2 and drive the stator 2 to rotate; the traction mechanism is set corresponding to one side end face of the stator 2, the traction mechanism is used to install the detection rod 4 and drag the detection rod 4 into the stator 2 to move along the axial direction of the stator 2, and the detection rod 4 is used to detect the inner hole runout value of the core segment and the copper segment; the lifting mechanism 9 is used to drive the detection rod 4 to move up and down so that the center of the detection rod 4 is aligned with the center of the stator 2; the translation mechanism is set on one side of the rotating support mechanism, and a robot 10 is provided on the translation mechanism. The direction in which the translation mechanism drives the robot 10 to move is parallel to the axial direction of the stator 2, and the robot 10 is provided with a spraying component and a cooling component to straighten the stator 2; the control system is respectively connected to the rotating support mechanism, the traction mechanism, the detection rod 4, the lifting mechanism 9, the translation mechanism and the robot 10.

[0044] Specifically, the control system is arranged in a control cabinet 7 , and a display 6 is also arranged on the control cabinet 7 .

[0045] Furthermore, the rotating support mechanism includes a bracket, a roller 23 and a rotating motor 13, wherein a plurality of the brackets are arranged at intervals along the axial direction of the stator 2, and each of the brackets is symmetrically provided with two rollers 23 corresponding to the outer periphery of the stator 2, and the motor shaft of the rotating motor 13 is connected to the transmission connecting rod 14, and the transmission connecting rod is connected to the corresponding rollers through a plurality of belt transmission structures 24, specifically, a driving pulley is provided on the transmission connecting rod corresponding to each roller, and the driving pulley is connected to a driven pulley through a transmission belt, and each driven pulley is coaxially connected to each roller, respectively, and the rotating motor rotates to drive the transmission connecting rod to rotate, and each driving pulley on the transmission connecting rod rotates, driving the driven pulley to rotate, and the roller coaxial with the driven pulley rotates. The roller 23 is used to support the stator 2 on the one hand, and to drive the stator 2 to rotate on the other hand by friction.

[0046] Furthermore, the traction mechanism includes a drag chain 5 and a traction motor 20, the traction motor 20 is arranged on the side of the probe rod 4 away from the rotating support mechanism 3, the traction motor 20 is used to push the drag chain 5 to move, the probe rod 4 is installed on the moving end of the drag chain 5, and a data line is arranged inside the drag chain 5, and the two ends of the data line are respectively connected to the probe rod 4 and the control system for communication. The outer cover of the lower drag chain 5 is provided with a drag chain pipe 8.

[0047] Furthermore, the lifting mechanism 9 includes a lifting motor, a screw rod 21 and a lifting platform 22, wherein the screw rod 21 is vertically arranged, the lifting platform 22 is threadedly connected to the screw rod 21, the lifting motor is connected to the screw rod 21, the lifting platform 22 is arranged between the traction motor 20 and the stator 2, and the lifting platform 22 is located below the drag chain 5. The lifting platform 22 can support and drive the drag chain 5 to rise and fall, and can adjust the center position of the detection rod 4 on the drag chain 5 to align with the center of the stator 2.

[0048] Furthermore, the spraying assembly includes an igniter 15 and an acetylene gun 17. The igniter 15 is arranged on a side of the robot 10 close to the lifting mechanism 9 through a bracket, and the acetylene gun 17 is arranged at the moving end of the robot 10. The acetylene gun 17 is connected to a gas source, and an oxygen acetylene valve 12 is arranged at the gas source.

[0049] Furthermore, the bracket is tilted in a direction away from the robot 10. This allows a certain distance between the igniter 15 and the acetylene gun 17, which is safe.

[0050] Furthermore, the cooling assembly includes a cooling pipe 16, and the cooling pipe 16 is provided at the moving end of the robot 10. In this embodiment, the robot 10 may be a six-degree-of-freedom robot; the translation mechanism may be a belt transmission mechanism, a chain transmission mechanism, a gear rack transmission mechanism, or a screw nut transmission mechanism, etc., and the translation mechanism is provided with a track parallel to the axial direction of the stator 2, so that the robot 10 moves along the track 11.

[0051] Furthermore, it also includes a first encoder 18 and a second encoder 19, the first encoder is arranged below the stator close to the lifting mechanism, the front end of the stator presses the first encoder, the first encoder is used to monitor the rotation angle of the stator, the second encoder is arranged on the side of the lifting mechanism away from the stator, the second encoder is arranged between the lifting mechanism and the traction motor, and the second encoder is used to monitor the depth distance of the detection rod entering the inner hole of the stator.

[0052] A method for the aforementioned automatic submersible motor stator straightening device, such as Figure 5 As shown, the following steps are included:

[0053] The motor stator 2 is manually placed on the rotating support structure 3, the front end of the stator 2 presses the first encoder 18, and the second encoder 19 detects the end face distance of the stator 2;

[0054] Manually install the corresponding detection rod 4 to the moving end of the drag chain 5 according to the specifications of the stator 2; manually align the male and female connectors of the detection rod 4 and the drag chain 5 and retract them to connect the detection rod 4 with the drag chain 5. The inside of the drag chain 5 is a data cable, and the data detected by the detection rod 4 is transmitted back to the control system;

[0055] The lifting mechanism 9 is lifted and lowered to a position where the center of the detection rod 4 is flush with the center of the stator 2 according to the specifications of the stator 2; the product specifications of the stator 2 are given by the WES system production scheduling or manually input into the control system;

[0056] The traction mechanism pushes the drag chain 5 to drive the detection rod 4 forward. The specified forward distance is obtained by detecting the end face distance of the stator 2 before. In the initial state, the detection rod is located at the second encoder position. The first section of the specified forward distance is the stator end face distance plus 1 / 2 of the first section of the core length. The corresponding position is the midpoint of the core. The control system pre-stores data such as the corresponding inner and outer diameters of stators of various specifications and the length of the copper core of each section of the core.

[0057] According to the specified forward distance, the probe rod 4 just reaches the middle position of the first core segment; the data parameters of each stator 2 product are entered into the control system in advance;

[0058] The rotating motor 13 drives the roller 23 to rotate, and the roller 23 drives the stator 2 to rotate through friction. The detection rod 4 starts to detect the inner hole of the core segment for one circle, detects the run-out value, and determines whether the run-out range is qualified. If it is unqualified, the coordinates of the highest point of the bend and the rotation angle are recorded. The data are obtained by the first encoder and the second encoder; for example, the qualified run-out value is set to 0.05mm, the highest point of the bend is determined and compared with 0.05mm, and the coordinates of the highest point of the bend and the rotation angle are recorded when it is higher than 0.05mm;

[0059] After the rotation is completed, continue to move forward to the center section of the copper sheet and repeat the previous process to detect the runout value; after that, the detection method of all core sections and copper segments is the same;

[0060] After the detection is completed, the detection rod 4 is retracted; the control system rotates the highest point of the first bend to the top for spraying according to the record and algorithm; the robot 10 moves to the spraying point on the track, the robot 10 changes its posture, aligns the acetylene gun 17 with the igniter 15, and moves to the highest point of the first bend for spraying. The burning time is determined according to the size of the jump. After the burning is completed, the robot 10 changes its posture, aligns the cooling pipe 16 with the surface of the stator 2 core to be sprayed, and water cooling is performed. The cooling time is adjustable, and the data such as the spraying time, flame size, and spraying range are recorded in the database of the control system;

[0061] After the first stage of combustion is completed, the stator 2 rotates to the highest point of the second bend and rotates upward. The robot 10 moves to the highest point of the second bend for spraying and water cooling (subsequent actions are the same as above). After all points are burned, the robot 10 returns to the origin, and the detection rod 4 starts to retest to determine whether the jump range is qualified. If it is unqualified, the coordinates and rotation angle of the highest point of the bend are recorded; Note: The detection position is the middle position of the iron core segment and the copper segment, and the spraying position is the middle position of the iron core segment and the iron core position near the two ends of the copper segment; the retest is consistent with the first test action. The retest iron core segment detection jump range ≤0.08mm is qualified, and the copper segment detection jump range ≤0.06mm is qualified;

[0062] After all points are retested, the detection rod 4 returns to the origin. If it is unqualified, it will be sprayed again, water-cooled, and retested until it is qualified. When all points are retested and qualified, the product will be transported to the cleaning area by the overhead crane and manually re-inspected with a test fixture.

[0063] In summary, this embodiment uses intelligent equipment, does not require direct manual operation, reduces work intensity, and improves product straightening accuracy.

[0064] For ease of description, spatially relative terms such as "upper", "lower", "outer layer", "inner layer" and the like are used in the embodiments to illustrate the relationship of one element or feature shown in the figures relative to another element or feature. It should be understood that in addition to the orientation shown in the figures, the spatial terms are intended to include different orientations of the device in use or operation. Therefore, the exemplary term "lower" can include both upper and lower orientations.

[0065] Although the preferred implementation cases of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms of specific changes without departing from the scope of protection of the invention spirit and claims, which all fall within the scope of protection of the present invention.

Claims

1. An automatic submersible motor stator straightening device, characterized in that: include: A rotating support mechanism, the rotating support mechanism is used to support the outer periphery of the stator and drive the stator to rotate; A traction mechanism, the traction mechanism is arranged corresponding to one end surface of the stator, the traction mechanism is used to install a detection rod and drag the detection rod into the stator to move along the axial direction of the stator, and the detection rod is used to detect the inner hole runout value of the iron core segment and the copper segment; An extension and lifting mechanism, the extension and lifting mechanism is used to drive the detection rod to move up and down so that the center of the detection rod is aligned with the center of the stator; A translation mechanism, the translation mechanism is arranged on one side of the rotating support mechanism, a robot is arranged on the translation mechanism, the translation mechanism drives the robot to move in a direction parallel to the axial direction of the stator, and a spraying component and a cooling component are arranged on the robot to perform a straightening operation on the stator; A control system is respectively connected to the rotating support mechanism, the traction mechanism, the detection rod, the lifting mechanism, the translation mechanism and the robot for communication.

2. The automatic submersible motor stator straightening device according to claim 1 is characterized in that: The rotating support mechanism includes a bracket, a roller and a rotating motor. A plurality of the brackets are arranged at intervals along the axial direction of the stator. Each bracket is symmetrically provided with two rollers corresponding to the outer circumference of the stator. The rotating motor drives the rollers to rotate through a belt transmission structure.

3. The automatic submersible motor stator straightening device according to claim 1 is characterized in that: The traction mechanism includes a drag chain and a traction motor. The traction motor is arranged on a side of the detection rod away from the rotating support mechanism. The traction motor is used to push the drag chain to move. The detection rod is installed on the moving end of the drag chain. A data cable is arranged inside the drag chain. Both ends of the data cable are respectively communicated with the detection rod and a control system.

4. The automatic submersible motor stator straightening device according to claim 3 is characterized by: The lifting mechanism includes a lifting motor, a screw rod and a lifting platform. The screw rod is vertically arranged. The lifting platform is threadedly connected to the screw rod. The lifting motor is connected to the screw rod. The lifting platform is arranged between the traction motor and the stator. The lifting platform is located below the drag chain.

5. The automatic submersible motor stator straightening device according to claim 1, characterized in that: The spraying and burning assembly comprises an igniter and an acetylene gun. The igniter is arranged on a side of the robot close to the lifting mechanism through a bracket, and the acetylene gun is arranged at the moving end of the robot.

6. The automatic submersible motor stator straightening device according to claim 5, characterized in that: The bracket is tilted in a direction away from the robot.

7. The automatic submersible motor stator straightening device according to claim 1, characterized in that: The cooling assembly includes a cooling pipe, and the cooling pipe is arranged at the moving end of the robot.

8. The automatic submersible motor stator straightening device according to claim 1, characterized in that: It also includes a first encoder and a second encoder. The first encoder is arranged below the stator close to the extension mechanism. The front end of the stator presses the first encoder. The first encoder is used to monitor the rotation angle of the stator. The second encoder is arranged on the side of the extension mechanism away from the stator. The second encoder is used to monitor the depth distance of the detection rod entering the inner hole of the stator.

9. A method for the automatic submersible motor stator straightening device according to any one of claims 1 to 8, characterized in that: The following steps are involved: The motor stator is manually placed on the rotating support structure, the front end of the stator presses the first encoder, and the second encoder detects the distance between the stator end faces; Manually install the corresponding detection rod to the moving end of the drag chain according to the stator specifications and models; The lifting mechanism is lifted and lowered according to the stator specifications until the center of the detection rod is flush with the center of the stator; The traction mechanism pushes the drag chain to drive the probe rod forward, and the specified forward distance is obtained by the previously detected stator end face distance; According to the specified forward distance, the probe rod is made to just reach the middle position of the first core segment; The rotating motor drives the roller to rotate, and the roller drives the stator to rotate through friction. The detection rod begins to detect the inner hole of the core segment for one circle, detects the runout value, and determines whether the runout range is qualified. If it is unqualified, the coordinates of the highest bending point and the rotation angle are recorded; After the rotation is completed, continue to move forward to the center section of the copper sheet and repeat the previous process to detect the runout value; after that, the detection method of all core sections and copper segments is the same; After the detection is completed, the probe rod is retracted; the control system rotates the highest point of the first bend to the top for spraying according to the records and algorithms; the robot moves to the spraying point, changes its posture, aligns the acetylene gun with the igniter, and moves to the highest point of the first bend for spraying. After the burning is completed, the robot changes its posture, aligns the cooling pipe with the surface of the stator core being sprayed, and performs water cooling; After the first stage of combustion is completed, the stator rotates to the highest point of the second bend and rotates upward. The robot moves to the highest point of the second bend for spraying and water cooling. After all points are burned, the robot returns to the origin and the detection rod begins to retest to determine whether the runout range is qualified. If it is unqualified, the coordinates of the highest point of the bend and the rotation angle are recorded; After all points are retested, the detection rod returns to the origin. If unqualified, they are sprayed again, water-cooled, and retested until they are qualified.

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