An internal thread eddy current inspection curve adjusting device

Abstract

The utility model relates to the technical field of internal thread detection, especially to a kind of internal thread eddy current flaw detection curve adjusting device, comprising: main body support table, support setting on ground;Fixed to piece mechanism, setting on main body support table;Adjusting to piece mechanism, setting on main body support table, with fixed to piece mechanism cooperation to support the workpiece to be detected;Workpiece rotating mechanism, setting on main body support table, for driving fixed to piece mechanism and adjusting to piece mechanism support workpiece rotation;Detection mechanism, setting on main body support table, for the internal thread detection to workpiece to be detected;Wherein, detection mechanism includes: detection support, horizontally sliding setting on main body support table;Outer detection support rod, up and down sliding setting on detection support;Outer detection probe, set on outer detection support rod, for the outer detection to workpiece;Inner detection support rod, up and down sliding setting on detection support;Special-shaped rod, set on inner detection support rod, and special-shaped rod is set to right angle shape.

Description

Technical Field

[0001] This utility model relates to the technical field of internal thread inspection, and in particular to an internal thread eddy current flaw detection curve adjustment device. Background Technology

[0002] Internal thread structures are widely used in various parts across numerous fields such as machinery manufacturing, aerospace, and automotive industries. The quality of the internal thread directly affects the reliability, safety, and service life of the entire mechanical system. Defects in the internal thread, such as cracks, porosity, inclusions, and dimensional deviations, can lead to loose connections, leaks, and even serious mechanical failures and safety accidents. Therefore, accurate and efficient inspection of internal threads is crucial. Eddy current testing technology is a non-destructive testing method based on the principle of electromagnetic induction, offering advantages such as high testing speed, high sensitivity, ability to perform testing at high temperatures, and relatively low requirements for workpiece surface cleanliness. Existing internal thread flaw detection equipment still has many shortcomings in practical applications. Due to the significant differences in the structure of internal thread workpieces of different specifications, the detection mechanism of existing flaw detection equipment often has poor adaptability, making it difficult to quickly adjust the probe position and orientation to adapt to the detection requirements of different workpieces, resulting in insufficient equipment versatility. The internal inspection probes in existing detection mechanisms are mostly straight rod structures. When inserted into the internal thread hole for detection, it is difficult to ensure that the probe maintains a stable coupling distance with key detection surfaces such as the thread root and flank. This can easily lead to unstable detection signals due to probe position deviation, resulting in missed or false detections. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model provides an internal thread eddy current flaw detection curve adjustment device that can improve the versatility of equipment and the comprehensiveness of test results.

[0004] This utility model discloses an internal thread eddy current flaw detection curve adjustment device, comprising: The main support platform is set on the ground; The component fixing mechanism is set on the main support platform; The adjustable support mechanism is set on the main support platform and works in conjunction with the fixed support mechanism to support the workpiece to be inspected; The workpiece rotation mechanism is set on the main support platform and is used to drive the workpiece supported by the fixed support mechanism and the adjustable support mechanism to rotate. The detection mechanism, mounted on the main support platform, is used to detect the internal threads of the workpiece to be inspected. The detection mechanisms include: The detection bracket is horizontally slidably mounted on the main support platform; The external inspection support rod is slidably mounted on the detection bracket. An external inspection probe, fitted onto an external inspection support rod, is used for external inspection of workpieces; The internal inspection support rod is slidably mounted on the detection bracket. A special-shaped rod is fitted onto an internal inspection support rod. The special-shaped rod is set at a right angle and is equipped with an internal inspection probe, which is used to perform internal inspection on the internal threads of the workpiece.

[0005] As a preferred embodiment of this utility model, the external inspection probe is slidably sleeved on the external inspection support rod, and the irregular rod is slidably sleeved on the internal inspection support rod. Both the external inspection probe and the irregular rod are fixed by adjusting screws.

[0006] As a preferred embodiment of this utility model, both the outer inspection support rod and the inner inspection support rod are provided with threaded positioning bolts, which are used to fix the upper and lower adjustable outer inspection support rod and the inner inspection support rod.

[0007] As a preferred embodiment of this utility model, the detection mechanism further includes: The drive screw is fixedly installed on the main support platform, and the bottom end of the probe bracket slides with the drive screw. The guide rail is rotatably mounted on the main support platform. The guide rail is driven to rotate by a motor. The guide rail and the drive screw are parallel to each other. The bottom end of the detection bracket is threadedly engaged with the guide rail.

[0008] As a preferred embodiment of this utility model, the fixing support mechanism includes: Fixed support blocks are fixedly installed on the main support platform; The first slide block is fixedly installed on the fixed support block, and the first slide block is provided with an adjusting support mechanism; The adjusting support mechanism includes: Both adjusting slide rails are fixedly installed on the main support platform; The second slide block is slidably mounted on two adjusting slide rails, and the second slide block is equipped with an adjusting support mechanism; The slide positioning rod is vertically threaded and inserted into the second slide, and a positioning pad is provided at the bottom of the slide positioning rod.

[0009] As a preferred embodiment of this utility model, the adjusting support mechanism includes: A threaded rod with positive and negative threads is rotatably mounted on the first slide and the second slide, and a handwheel is provided at the end of the threaded rod with positive and negative threads. Two roller slides are provided on the first slide and the second slide, and the roller slides are threaded into the positive and negative threaded rods. Support rollers are rotatably mounted on each roller slide.

[0010] As a preferred embodiment of this utility model, the workpiece rotation mechanism includes: A height adjustment rod is fixedly installed on the main support platform, and a rack is vertically installed on the height adjustment rod; The lifting mounting frame slides up and down on the height adjustment rod. An adjustment gear is rotatably installed in the lifting mounting frame, and the adjustment gear meshes with the rack of the height adjustment rod. The drive wheel is rotatably mounted on the lifting mounting frame and is driven to rotate by a motor.

[0011] As a preferred embodiment of this utility model, the lifting mounting frame is provided with threaded fastening bolts for fixing the position of the vertically adjustable lifting mounting frame.

[0012] Compared with existing technologies, the advantages of this invention are as follows: the horizontal sliding of the detection bracket, the up-and-down sliding of the outer and inner inspection rods, and the position and angle adjustment functions of the irregular rods enable the detection mechanism to be quickly and flexibly adjusted according to internal thread workpieces of different specifications and shapes, improving the versatility of the equipment; the workpiece rotation mechanism drives the workpiece to rotate, and in conjunction with the multi-dimensional adjustment function of the detection mechanism, the inner inspection probe can perform comprehensive and detailed inspection of the entire surface of the workpiece's internal thread; at the same time, the outer inspection probe can inspect the exterior of the workpiece, realizing simultaneous evaluation of the internal and external quality of the workpiece; this device enables rapid and accurate adjustment of the detection mechanism, reducing the time and effort required for repeated manual adjustments; the automatic rotation of the workpiece further improves the detection speed, making the entire detection process more efficient. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is an enlarged schematic diagram of the detection mechanism; Figure 3 This is a schematic diagram of the installation structure of the fixed support mechanism and the adjustable support mechanism; Figure 4 This is an enlarged schematic diagram of the workpiece rotation mechanism; The attached diagram is labeled as follows: 1. Main support platform; 2. Fixing support mechanism; 21. Fixing block; 22. First slide; 3. Adjusting support mechanism; 31. Adjusting slide rail; 32. Second slide; 33. Slide positioning rod; 34. Positive and negative threaded rod; 35. Handwheel; 36. Roller slide; 37. Support roller; 4. Workpiece rotation mechanism; 41. Height adjustment rod; 42. Lifting mounting frame; 43. Adjusting gear; 44. Drive wheel; 45. Fastening bolt; 5. Detection mechanism; 51. Detection bracket; 52. External inspection support rod; 53. External inspection probe; 54. Internal inspection support rod; 55. Irregular rod; 56. Internal inspection probe; 57. Positioning bolt; 58. Drive screw; 59. Guide rail. Detailed Implementation

[0014] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0015] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0016] Reference Figures 1-4 This embodiment provides a device for adjusting the eddy current flaw detection curve of internal threads, including: Main support platform 1, which is supported on the ground; The fixed support mechanism 2 is installed on the main support platform 1; The adjustable support mechanism 3 is set on the main support platform 1 and works in conjunction with the fixed support mechanism 2 to support the workpiece to be inspected. The workpiece rotation mechanism 4 is set on the main support platform 1 and is used to drive the workpiece supported by the fixed support mechanism 2 and the adjustable support mechanism 3 to rotate. The detection mechanism 5 is set on the main support platform 1 and is used to detect the internal threads of the workpiece to be inspected; Among them, the detection mechanism 5 includes: The detection bracket 51 is horizontally slidably mounted on the main support platform 1; The external inspection support rod 52 is slidably mounted on the detection bracket 51. An external inspection probe 53 is mounted on an external inspection support rod 52 and is used for external inspection of the workpiece. The internal inspection support rod 54 is slidably mounted on the detection bracket 51. A special-shaped rod 55 is sleeved on the internal inspection support rod 54. The special-shaped rod 55 is set at a right angle. An internal inspection probe 56 is set on the special-shaped rod 55. The internal inspection probe 56 is used to perform internal inspection on the internal thread of the workpiece. In this embodiment, the internal thread workpiece to be inspected is placed on the main support platform 1. The workpiece is supported by the fixed support mechanism 2 and the adjusting support mechanism 3 working together. The adjusting support mechanism 3 can be adjusted according to the specific specifications of the workpiece to ensure that the workpiece is stably fixed. The workpiece rotation mechanism 4 is set on the main support platform 1. After the workpiece is fixed, the workpiece rotation mechanism 4 is activated to drive the supported workpiece to rotate. The rotation of the workpiece allows the detection mechanism 5 to perform a comprehensive inspection of the entire internal thread surface of the workpiece in a relatively static state. The detection bracket 51 is horizontally slidably set on the main support platform 1. According to the size of the workpiece and the requirements of the detection position, the detection bracket 51 can be moved horizontally to adjust the detection mechanism 5 to a suitable approximate horizontal position so that the internal inspection probe 56 can approach the internal thread hole of the workpiece. The external inspection support rod 52 and the internal inspection support rod 54 are both slidably set on the detection bracket 51. The external inspection support rod 52 is used to install the external inspection probe 53, which can inspect the exterior of the workpiece. The internal inspection support rod 54 is used to install the special-shaped rod 55 and the internal inspection probe 56. By sliding the internal inspection support rod 54 up and down, the internal inspection probe 56 can be inspected. The internal inspection probe 56 is adjusted to a suitable height so that it can extend into the internal threaded hole. The internal inspection probe 56 detects the internal thread of the workpiece and transmits the detection signal to the subsequent analysis equipment by sensing the eddy current changes in the internal thread. At the same time, the external inspection probe 53 can simultaneously detect the exterior of the workpiece to comprehensively evaluate the quality of the workpiece. The horizontal sliding of the detection bracket 51, the up-and-down sliding of the external inspection support rod 52 and the internal inspection support rod 54, and the position and angle adjustment function of the special-shaped rod 55 enable the detection mechanism 5 to be quickly and flexibly adjusted according to internal threaded workpieces of different specifications and shapes, improving the versatility of the equipment. The workpiece rotation mechanism 4 drives the workpiece to rotate, and together with the multi-dimensional adjustment function of the detection mechanism 5, the internal inspection probe 56 can perform a comprehensive and detailed inspection of the entire surface of the internal thread of the workpiece. At the same time, the external inspection probe 53 can detect the exterior of the workpiece, realizing the simultaneous evaluation of the internal and external quality of the workpiece. This device realizes the rapid and accurate adjustment of the detection mechanism, reducing the time and effort of repeated manual debugging. The automatic rotation of the workpiece also further improves the detection speed, making the entire detection process more efficient.

[0017] As a preferred embodiment of the above technical solution, such as Figure 2 As shown, the external inspection probe 53 is slidably sleeved on the external inspection support rod 52, and the special-shaped rod 55 is slidably sleeved on the internal inspection support rod 54. Both the external inspection probe 53 and the special-shaped rod 55 are fixed after adjustment by screws. In this embodiment, the external inspection probe 53 slides on the external inspection support rod 52 and the irregular rod 55 slides on the internal inspection support rod 54 and can be adjusted in angle, so that the internal thread eddy current flaw detection curve adjustment device can adapt to internal thread workpieces of different specifications and shapes. By sliding and adjusting the position and angle of the external inspection probe 53 and the irregular rod 55, the probe can accurately reach the detection position, thereby improving the adaptability of the equipment.

[0018] Specifically, such as Figure 2 As shown, both the outer inspection support rod 52 and the inner inspection support rod 54 are threaded with positioning bolts 57, which are used to fix the upper and lower adjustable outer inspection support rod 52 and inner inspection support rod 54. In this embodiment, by setting positioning bolts 57 on the outer inspection support rod 52 and the inner inspection support rod 54, the outer inspection support rod 52 and the inner inspection support rod 54 can be easily adjusted up and down, so that the outer inspection probe 53 and the inner inspection probe 56 can accurately reach the appropriate inspection position; this improves the adaptability of the internal thread eddy current flaw detection curve adjustment device to workpieces of different specifications. The positioning bolts 57 can accurately fix the outer inspection support rod 52 and the inner inspection support rod 54 in the appropriate position after adjustment, ensuring that the position of the outer inspection probe 53 and the inner inspection probe 56 is stable during the inspection process, thereby improving the accuracy of the inspection.

[0019] More specifically, such as Figure 2 As shown, the detection mechanism 5 also includes: The drive screw 58 is fixedly installed on the main support platform 1, and the bottom end of the detection bracket 51 is slidably engaged with the drive screw 58. The guide rail 59 is rotatably mounted on the main support platform 1. The guide rail 59 is driven to rotate by a motor. The guide rail 59 and the drive screw 58 are parallel to each other. The bottom end of the detection bracket 51 is threadedly engaged with the guide rail 59. In this embodiment, when it is necessary to move the detection bracket 51 horizontally to adjust the position of the detection mechanism 5 to adapt to the detection requirements of internal thread workpieces in different positions, the motor driving the guide rail 59 to rotate is started; the rotational power output by the motor is transmitted to the guide rail 59, causing the guide rail 59 to start rotating around its own axis on the main support platform 1; since the guide rail 59 and the drive screw 58 are arranged parallel to each other, and the drive screw 58 is fixedly installed on the main support platform 1 and remains stationary, it provides a stable reference and guide for the horizontal movement of the detection bracket 51; the installation positions of internal thread workpieces of different specifications on the main support platform 1 may be different; through the cooperation of the drive screw 58 and the guide rail 59, the horizontal position of the detection bracket 51 can be precisely controlled, so that the detection mechanism 5 can be moved quickly and accurately to a position suitable for detecting different workpieces; the adaptability of the internal thread eddy current flaw detection curve adjustment device to workpieces of different specifications and positions is improved, and the versatility of the equipment is enhanced.

[0020] Furthermore, such as Figure 3 As shown, the fixing support mechanism 2 includes: Fixed support block 21 is fixedly installed on the main support platform 1; The first slide block 22 is fixedly installed on the fixed support block 21, and the first slide block 22 is provided with an adjusting support mechanism; Adjusting support mechanism 3 includes: Both adjusting slide rails 31 are fixedly installed on the main support platform 1; The second slide block 32 is slidably mounted on two adjusting slide rails 31, and the second slide block 32 is provided with an adjusting support mechanism. The slide positioning rod 33 is vertically threaded into the second slide 32, and a positioning pad is provided at the bottom end of the slide positioning rod 33. In this embodiment, two adjusting slide rails 31 are fixedly installed on the main support platform 1, providing a track for the sliding of the second slide block 32. When it is necessary to adjust the support position according to the size of different workpieces, the operator manually pushes the second slide block 32 to make it slide horizontally along the two adjusting slide rails 31. During the sliding process, the second slide block 32 can be moved to a suitable position according to the length, diameter and other dimensional parameters of the workpiece to cooperate with the first slide block 22 of the fixed support mechanism 2 to adapt to the support requirements of different workpieces. After the second slide block 32 slides to the suitable position, the second slide block 32 is positioned and fixed to prevent the second slide block 32 from moving during the inspection process. At this time, the operator rotates the slide block positioning rod 33. Since the slide block positioning rod 33 is vertically threaded and inserted into the first slide block 22, the second slide block 32 is fixed in position. On the second slide 32, rotating the slide positioning rod 33 will move it downwards; the positioning pad at the bottom of the slide positioning rod 33 will gradually approach the main support platform 1. When the positioning pad is in close contact with the main support platform 1 and generates sufficient friction, the second slide 32 is fixed in the current position and can no longer slide along the adjusting slide rail 31; after the second slide 32 is positioned and fixed, the first slide 22 of the fixing support mechanism 2 and the second slide 32 of the adjusting support mechanism 3 can jointly support the workpiece to be inspected; the workpiece is placed on the first slide 22 and the second slide 32, and through the cooperation of the two, the workpiece is kept in a stable state; the adjustable support method makes the internal thread eddy current flaw detection curve adjustment device applicable to the inspection of various types and specifications of internal thread workpieces, improving the versatility of the equipment.

[0021] Furthermore, such as Figure 3 As shown, the adjusting support mechanism includes: A threaded rod 34 is rotatably mounted on the first slide block 22 and the second slide block 32, and a handwheel 35 is provided at the end of the threaded rod 34. Two roller slides 36 are slidably arranged on the first slide 22 and the second slide 32, and the roller slides 36 are threadedly engaged with the positive and negative threaded rods 34. Support rollers 37 are rotatably mounted on each roller slide 36; In this embodiment, when different specifications of workpieces need to be placed for inspection, the operator rotates the handwheel 35, which drives the positive and negative threaded rod 34 to rotate. Since the positive and negative threaded rod 34 has both positive and negative threads, the two roller slides 36 that are threaded into the positive and negative threaded rod 34 will move in opposite or opposite linear motions along the positive and negative threaded rod 34. When the positive and negative threaded rod 34 rotates in one direction, one roller slide 36 will move along the first slide 22 or the second slide 32 towards the other roller slide 36, while the other roller slide 36 moves in the opposite direction. When the positive and negative threaded rod 34 rotates in the opposite direction, the two roller slides 36 also move in opposite directions. When rollers 6 move relative to or away from each other, the support rollers 37 mounted on roller slides 36 will also move accordingly. The operator can precisely adjust the distance between the two roller slides 36 by turning the handwheel 35 according to the workpiece's diameter and other dimensional parameters, so that the support rollers 37 can just contact the outer surface of the workpiece, thereby stably supporting the workpiece between the first slide 22 and the second slide 32. During the inspection process, the support rollers 37 can rotate along with the workpiece rotating mechanism 4, reducing the obstruction to the workpiece's rotation. The operator can turn the handwheel 35 to move the support rollers 37 closer or further away, thereby adapting to the support requirements of workpieces with different diameters and improving the adaptability of the device to workpieces of different specifications.

[0022] Furthermore, such as Figure 4 As shown, the workpiece rotation mechanism 4 includes: A height adjustment rod 41 is fixedly installed on the main support platform 1, and a rack is vertically installed on the height adjustment rod 41. The lifting mounting frame 42 is slidably sleeved on the height adjusting rod 41. An adjusting gear 43 is rotatably installed in the lifting mounting frame 42, and the adjusting gear 43 meshes with the rack of the height adjusting rod 41. The drive wheel 44 is rotatably mounted on the lifting mounting frame 42, and the drive wheel 44 is driven to rotate by a motor. In this embodiment, when the height of the drive wheel 44 needs to be adjusted to accommodate workpieces of different specifications, the operator rotates the adjusting gear 43. Since the adjusting gear 43 meshes with the rack on the height adjusting rod 41, according to the principle of gear transmission, the rotation of the adjusting gear will drive the lifting mounting frame 42 to move up and down along the height adjusting rod 41. After the drive wheel 44 is adjusted to a suitable position in contact with the workpiece, the motor is started, and the motor drives the drive wheel 44 to rotate. The drive wheel contacts the surface of the workpiece and generates friction. Under the action of friction, the drive wheel drives the workpiece to rotate. At the same time, since the workpiece is supported by the fixed support mechanism 2 and the adjusting support mechanism 3, the workpiece can rotate smoothly around its own axis under the drive of the drive wheel, so that the detection mechanism 5 can perform a comprehensive inspection of the internal thread of the workpiece. The workpiece rotation mechanism, through the height adjustment system composed of the height adjusting rod 41, the lifting mounting frame 42 and the adjusting gear 43, can conveniently adjust the height of the drive wheel 44, improving the adaptability of the equipment to workpieces of different specifications.

[0023] Furthermore, such as Figure 4 As shown, the lifting mounting frame 42 is provided with threaded fastening bolts 45 for fixing the position of the lifting mounting frame 42 that can be adjusted up and down; In this embodiment, during the eddy current detection process, the workpiece needs to maintain a stable and precise rotation state so that the detection mechanism 5 can accurately detect the internal thread. After the fastening bolt 45 fixes the position of the lifting mounting bracket 42, the height of the drive wheel 44 is stably locked, which can continuously provide a stable and uniform driving force to the workpiece, so that the workpiece rotates at the set speed and direction. This avoids the workpiece rotation from becoming unstable due to changes in the height of the drive wheel, thereby ensuring the stability of the detection signal.

[0024] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A device for adjusting the eddy current flaw detection curve of internal threads, characterized in that, include: The main support platform is set on the ground; The component fixing mechanism is installed on the main support platform; An adjustable support mechanism is set on the main support platform and works in conjunction with the fixed support mechanism to support the workpiece to be tested. A workpiece rotation mechanism is provided on the main support platform and is used to drive the workpiece supported by the fixed support mechanism and the adjustable support mechanism to rotate. The detection mechanism, mounted on the main support platform, is used to detect the internal threads of the workpiece to be inspected. The detection mechanism includes: The detection bracket is horizontally slidably mounted on the main support platform; The external inspection support rod is slidably mounted on the detection bracket. An external inspection probe, fitted onto the external inspection support rod, is used for external inspection of the workpiece; An internal inspection support rod is slidably mounted on the detection bracket. A special-shaped rod is sleeved on the internal inspection support rod. The special-shaped rod is set at a right angle and an internal inspection probe is provided on the special-shaped rod. The internal inspection probe is used to perform internal inspection on the internal threads of the workpiece.

2. The internal thread eddy current flaw detection curve adjustment device as described in claim 1, characterized in that, The external inspection probe is slidably sleeved on the external inspection support rod, and the irregular rod is slidably sleeved on the internal inspection support rod. Both the external inspection probe and the irregular rod are fixed by adjusting screws.

3. The internal thread eddy current flaw detection curve adjustment device as described in claim 1, characterized in that, Both the outer inspection support rod and the inner inspection support rod are threaded with positioning bolts, which are used to fix the upper and lower adjustable outer inspection support rod and the inner inspection support rod.

4. The internal thread eddy current flaw detection curve adjustment device as described in claim 1, characterized in that, The detection mechanism also includes: A drive screw is fixedly installed on the main support platform, and the bottom end of the detection bracket is slidably engaged with the drive screw; A guide rail is rotatably mounted on the main support platform. The guide rail is driven to rotate by a motor. The guide rail and the drive screw are parallel to each other. The bottom end of the detection bracket is threadedly engaged with the guide rail.

5. The internal thread eddy current flaw detection curve adjustment device as described in claim 1, characterized in that, The fixed support mechanism includes: A fixed support block is fixedly installed on the main support platform; The first slide block is fixedly installed on the fixed support block, and the first slide block is provided with an adjusting support mechanism; The adjusting support mechanism includes: Both adjusting slide rails are fixedly installed on the main support platform; The second slide block is slidably mounted on the two adjustable slide rails, and the second slide block is provided with an adjusting support mechanism; A slide positioning rod is vertically threaded into the second slide, and a positioning pad is provided at the bottom end of the slide positioning rod.

6. The internal thread eddy current flaw detection curve adjustment device as described in claim 5, characterized in that, The adjusting support mechanism includes: A threaded rod with positive and negative threads is rotatably mounted on the first slide and the second slide, and a handwheel is provided at the end of the threaded rod with positive and negative threads. Two roller slides are provided on both the first slide and the second slide, and the roller slides are threadedly engaged with the positive and negative threaded rod. Each of the roller slides has a support roller rotatably mounted on it.

7. The internal thread eddy current flaw detection curve adjustment device as described in claim 1, characterized in that, The workpiece rotation mechanism includes: A height adjustment rod is fixedly installed on the main support platform, and a rack is vertically provided on the height adjustment rod; A lifting mounting frame is slidably mounted on the height adjusting rod. An adjusting gear is rotatably installed in the lifting mounting frame, and the adjusting gear meshes with the rack of the height adjusting rod. The drive wheel is rotatably mounted on the lifting mounting frame, and the drive wheel is driven to rotate by a motor.

8. The internal thread eddy current flaw detection curve adjustment device as described in claim 7, characterized in that, The lifting mounting frame is equipped with threaded fastening bolts for fixing the position of the lifting mounting frame that is adjustable up and down.

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