A thread detection device

Abstract

The present application relates to a kind of thread detection device, when the device works, transfer mechanism drives screw gauge to press down to the screw hole of the workpiece to be detected, at this time eccentric mechanism under the reaction force can make screw gauge axial alignment in screw hole, then rotating motor drives rotating shaft to drive floating sleeve assembly, eccentric mechanism and screw gauge rotation, torsion sensor monitors the torsion of rotating shaft feedback, when the torsion of torsion sensor feedback exceeds load, rotating motor stops rotating, ensure that will not damage thread;Position sensor will feedback floating sleeve assembly position information to transfer mechanism during detection, transfer mechanism judges the distance of screw gauge relative rotating shaft and drives rotating shaft to follow movement, avoid when screw gauge cannot continue to move down, forcibly explore and damage thread.

Description

Technical Field

[0001] This invention relates to the field of thread inspection, and more particularly to a thread inspection device. Background Technology

[0002] Threads are one of the most common and fundamental structures in mechanical connections, and their quality directly affects the sealing performance, connection strength, assembly efficiency, and overall lifespan of a product. Therefore, thread inspection is a crucial part of quality control in manufacturing. Existing thread inspection devices, especially those for internal threaded holes, typically employ a combination of a rotary motor, upper and lower motors, and a thread gauge for mechanical measurement. The upper and lower motors drive the rotary motor to move up and down, and the thread gauge is mounted on the movable end of the rotary motor. The upper and lower motors drive the thread gauge to move up and down to probe into / out of the threaded hole to detect its depth, while the rotary motor drives the thread gauge to rotate to detect the thread condition. However, existing mechanical inspection methods are all hard-contact inspections. If the thread gauge is not axially aligned with the threaded hole when it enters, it will damage the threads inside the hole, damaging the workpiece. Furthermore, during the inspection process, the speed of the thread gauge's up-and-down movement and rotation are artificially set to be constant. If the thread gauge's rotation is slightly restricted, or if the mechanically forced linear downward speed of the thread gauge exceeds its natural downward speed, the threads will be damaged, resulting in a high scrap rate for workpieces during the thread inspection stage. Summary of the Invention

[0003] To overcome the above problems, the present invention provides a thread detection device. The technical solution adopted by the present invention to solve its technical problems is as follows: A thread inspection device includes a base, a material platform and a transfer mechanism on the base. The material platform holds the workpiece to be inspected. A mounting seat is located at the movable end of the transfer mechanism, and the thread inspection mechanism is mounted on the mounting seat. The thread inspection mechanism includes a rotary motor, the movable end of which is connected to a vertically downward rotating shaft via a torque sensor. A floating sleeve assembly is fitted onto the rotating shaft, sliding up and down along the shaft and rotating with it. A position sensor is located on the mounting seat to detect the position of the floating sleeve assembly on the rotating shaft. An eccentric mechanism is located at the bottom of the floating sleeve assembly, including a downward-pointing conical sleeve. A downward-pointing conical movable head is coaxially fitted inside the conical sleeve with clearance fitting. A chuck is located at the bottom of the conical movable head, and a thread gauge is mounted on the chuck. The transfer mechanism drives the thread gauge to press down onto the threaded hole of the workpiece to be inspected. The rotary motor drives the rotating shaft to rotate the floating sleeve assembly, the eccentric mechanism, and the thread gauge. The torque sensor monitors the torque fed back by the rotating shaft, and the position sensor feeds back the position information of the floating sleeve assembly to the transfer mechanism, which then drives the rotating shaft to move accordingly.

[0004] Furthermore, the side wall of the conical sleeve is provided with a limiting groove, and the side wall of the conical movable head is provided with a limiting block. The limiting block passes through the limiting groove to restrict the movement space of the conical movable head within the conical sleeve.

[0005] Furthermore, the floating sleeve assembly includes a cylinder cover and a cylinder sleeve that are coaxially and fixedly connected at their upper and lower positions. The rotating shaft slides through the cylinder cover from the axis and enters the cylinder sleeve. An eccentric mechanism is set at the bottom of the cylinder sleeve. A balance head is fixedly set at the end of the rotating shaft. A first elastic element is set between the balance head and the cylinder cover. A second elastic element is set between the balance head and the bottom surface of the inner wall of the cylinder sleeve. The first elastic element and the second elastic element drive the floating sleeve assembly to float up and down along the rotating shaft.

[0006] Furthermore, the outer wall of the rotating shaft is provided with a positioning groove along the axial direction, and the inner wall of the cylinder cover is provided with a positioning protrusion along the axial direction. When the cover sleeve is fitted onto the rotating shaft, the positioning protrusion matches the positioning groove, so that the floating sleeve assembly slides up and down along the rotating shaft while rotating with the rotating shaft.

[0007] Furthermore, a guide frame is fixed on the mounting base, and guide bearings are coaxially arranged on the upper and lower frame bars of the guide frame. The rotating shaft slides through the bearing of the upper frame bar into the guide frame and connects with the floating sleeve assembly. The sleeve slides through the bearing of the lower frame bar out of the guide frame and connects with the eccentric mechanism. A position sensor is set on the guide frame to monitor the position of the sleeve cover and feed back the position information to the transfer mechanism.

[0008] Furthermore, the mounting base is equipped with a pneumatic nozzle, which is oriented towards the thread gauge.

[0009] Furthermore, a turntable is provided on the base, and several material platforms are set on the turntable.

[0010] Furthermore, a lifting cylinder is installed on the base, and a pressure gauge is connected to the top movable end of the lifting cylinder. The lifting cylinder drives the pressure gauge to press down on the workpiece to be inspected.

[0011] Furthermore, the transfer mechanism includes left and right linear sliding modules, the sliders of the left and right linear sliding modules are provided with front and rear linear sliding modules, the sliders of the front and rear sliding modules are provided with up and down linear sliding modules, and the mounting base is provided on the sliders of the up and down linear sliding modules.

[0012] Furthermore, the left and right linear sliding modules, the front and rear linear sliding modules, and the up and down linear sliding modules are all electrically connected to the central controller, and each of the left and right linear sliding modules, the front and rear linear sliding modules, and the up and down linear sliding modules is equipped with a position sensor electrically connected to the central controller to ensure that the thread gauge moves to the top of the screw hole of the workpiece to be inspected; the rotary motor, torque sensor, and position sensor are also electrically connected to the central controller.

[0013] The beneficial effects of this invention are: The thread inspection device includes a base, on which a material platform and a transfer mechanism are mounted. The workpiece to be inspected is mounted on the material platform. A mounting seat is located at the movable end of the transfer mechanism, and the thread inspection mechanism is mounted on the mounting seat. The thread inspection mechanism includes a rotary motor, the movable end of which is connected to a vertically downward rotating shaft via a torque sensor. A floating sleeve assembly is fitted onto the rotating shaft, sliding up and down along the shaft and rotating with it. A position sensor is located on the mounting seat to detect the position of the floating sleeve assembly on the rotating shaft. An eccentric mechanism is located at the bottom of the floating sleeve assembly, comprising a downward-pointing conical sleeve. A downward-pointing conical movable head is fitted inside the conical sleeve with a clearance fit. The bottom of the conical movable head... The device is equipped with a chuck on which a thread gauge is mounted. During operation, the transfer mechanism pushes the thread gauge down onto the threaded hole of the workpiece to be inspected. At this time, the eccentric mechanism, under the reaction force, aligns the thread gauge axially with the threaded hole. Then, the rotary motor drives the rotating shaft to rotate the floating sleeve assembly, the eccentric mechanism, and the thread gauge. The torque sensor monitors the torque fed back by the rotating shaft. When the torque fed back by the torque sensor exceeds the load, the rotary motor stops rotating to ensure that the threads are not damaged. During the inspection process, the position sensor feeds back the position information of the floating sleeve assembly to the transfer mechanism. The transfer mechanism determines the downward movement distance of the thread gauge and drives the rotating shaft to follow, avoiding forced downward movement of the thread gauge when it cannot move further and thus damaging the threads. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, wherein: Figure 1 This is a perspective view of the thread detection device of the present invention; Figure 2 This is an exploded view of the thread detection device of the present invention; Figure 3 This is a three-dimensional view of the thread inspection mechanism; Figure 4 This is an exploded view of the thread inspection mechanism; Figure 5 This is a three-dimensional view of the floating sleeve assembly; Figure 6 This is an exploded view of the floating sleeve assembly; Figure 7 It is a cross-sectional view of the rotating shaft and floating sleeve assembly; Figure 8 This is an exploded view of the rotating shaft and the cylinder cover.

[0015] Figure number marking: 100. Base; 101. Material table; 102. Turntable; 103. Lifting cylinder; 104. Pressure gauge; 200. Transfer mechanism; 201. Mounting base; 202. Pneumatic nozzle; 203. Left and right linear sliding module; 204. Front and rear linear sliding module; 205. Up and down linear sliding module; 300. Thread detection mechanism; 301. Rotary motor; 302. Torque sensor; 303. Rotating shaft; 3031. Balance head; 3032. Positioning groove; 304. Floating sleeve assembly; 3041. Sleeve cover; 3042. Sleeve; 3043. First elastic element; 3044. Second elastic element; 3045. Positioning protrusion; 305. Position sensor; 306. Eccentric mechanism; 3061. Conical sleeve; 3062. Conical movable head; 3063. Chuck; 3064. Limiting groove; 3065. Limiting block; 307. Thread gauge; 308. Guide frame. Detailed Implementation

[0016] To better understand the purpose, structure, and function of the present invention, the following detailed description of a specific embodiment of the present invention, "a thread detection device," is provided in conjunction with the accompanying drawings.

[0017] See Figures 1-6 In this embodiment, the thread detection device includes a base 100, on which a material platform 101 and a transfer mechanism 200 are mounted. The material platform 101 holds the workpiece to be inspected, with all thread holes of the workpiece facing vertically upwards. The transfer mechanism 200 can be a robotic arm or an XYZ three-axis robotic arm. A mounting base 201 is fixed to the movable end of the transfer mechanism 200. A thread detection mechanism 300 is mounted on the mounting base 201. The thread detection mechanism 300 includes a rotary motor 301, and the movable end of the rotary motor 301 is connected to a vertically downward rotating shaft 303 via a torque sensor 302. A floating sleeve assembly 3 is fitted onto the rotating shaft 303. 04. The floating sleeve assembly 304 can slide up and down along the rotating shaft 303 and rotate synchronously with the rotating shaft 303. A position sensor 305 is also provided on the mounting base 201. The position sensor 305 will detect the up and down position information of the floating sleeve assembly 304 on the rotating shaft 303 at any time. An eccentric mechanism 306 is fixedly connected to the bottom of the floating sleeve assembly 304. The eccentric mechanism 306 includes a tapered sleeve 3061 with the tip pointing downward. A tapered movable head 3062 with the tip pointing downward is coaxially and clearance-fitted inside the tapered sleeve 3061. A chuck 3063 is provided at the bottom of the tapered movable head 3062. A thread gauge 307 is installed on the chuck 3063.

[0018] Taking the downward probing inspection of a thread inspection device as an example, when the thread inspection device is working, the transfer mechanism 200 first causes the thread gauge 307 to press down onto the threaded hole of the workpiece to be inspected. If the thread gauge 307 and the threaded hole are not axially aligned, the tapered movable head 3062 in the eccentric mechanism 306 will move appropriately within the tapered sleeve 3061 under the reaction force of gravity and the thread gauge 307, so that the thread gauge 307 and the threaded hole are axially aligned. This ensures that the thread gauge 307 will vertically penetrate the threaded hole when rotating, without damaging the thread during the insertion stage. At this time, the position sensor 305 will record the position information of the floating sleeve assembly 304. Then, the rotary motor 301 drives the rotary shaft 303 to drive the floating sleeve assembly 304, the eccentric mechanism 306, and the thread gauge 307 to rotate synchronously. During the rotation of the thread gauge 307, the thread... As the thread gauge 307 is subjected to the reaction force of the threaded hole, it continuously descends along the thread. As the thread gauge 307 descends, it drives the eccentric mechanism 306 and the floating sleeve assembly 304 to move downward relative to the rotating shaft 303. The position sensor 305 feeds back the position information of the floating sleeve assembly 304 to the transfer mechanism 200. The transfer mechanism 200 drives the rotating shaft 303 to follow and move downward, ensuring that the floating sleeve assembly 304 is always within the safe floating area on the rotating shaft 303, avoiding rigid contact between the rotating shaft 303 and the floating sleeve assembly 304, which would cause the thread gauge 307 to be subjected to excessive downward force and damage the thread. Furthermore, during the entire rotation and descent process of the thread gauge 307, the torque sensor 302 monitors the torque fed back by the rotating shaft 303. When the torque feedback is abnormal, the torque motor 301 stops rotating to prevent damage to the workpiece.

[0019] In summary, the thread detection device of the present invention first ensures that the thread gauge 307 will not be forcibly inserted into the hole and damage the thread and the workpiece through the eccentric mechanism 306; then, when the thread gauge 307 rotates downward to probe the hole, the position sensor 305 and the floating sleeve assembly 304 will transmit the downward distance of the thread gauge 307 in real time, and the transfer mechanism 200 drives the rotating shaft 303 to follow the downward movement, ensuring that the floating sleeve assembly 304 is always within the safe floating area on the rotating shaft 303, avoiding rigid contact between the rotating shaft 303 and the floating sleeve assembly 304, ensuring that the natural downward rotation speed of the thread gauge 307 is equal to the downward movement speed of the rotating shaft 303, and the thread gauge 307 will not be forced downward and damage the thread; and throughout the entire process, the torque fed back by the rotating shaft 303 is detected, and when the torque is abnormal, the rotating motor 301 is stopped in time to protect the workpiece from damage.

[0020] See further Figure 5 and Figure 6In this embodiment, the side wall of the tapered sleeve 3061 is provided with a limiting groove 3064, and the side wall of the tapered movable head 3062 is provided with a limiting block 3065. The limiting block 3065 passes through the limiting groove 3064 to limit the movement space of the tapered movable head 3062 within the tapered sleeve 3061 and prevent the tapered movable head 3062 from detaching from the tapered sleeve 3061. It should be noted that the taper of the inner wall of the tapered sleeve 3061 is the same as the taper of the outer wall of the tapered movable head 3062. Thus, under the action of gravity, the chuck 3063 at the bottom of the tapered movable head 3062 will naturally face vertically downward, improving the vertical insertion efficiency of the thread gauge 307.

[0021] See further Figure 4 and Figure 7 In this embodiment, the floating sleeve assembly 304 includes a cylindrical cover 3041 and a cylindrical sleeve 3042 coaxially and fixedly connected at their upper and lower positions. A rotating shaft 303 slides through the cylindrical cover 3041 from the axis and passes into the cylindrical sleeve 3042. An eccentric mechanism 306 is fixedly connected to the bottom of the cylindrical sleeve 3042. A balance head 3031 is fixedly provided at the end of the rotating shaft 303. The balance head 3031 is located in the space of the sleeve 3042. A first elastic element 3043 is provided between the balance head 3031 and the cylindrical cover 3041. A second elastic element 3044 is provided between the balance head 3031 and the bottom surface of the inner wall of the cylindrical sleeve 3042. Both the first elastic element 3043 and the second elastic element 3044 are preferably springs. The first elastic element 3043 and the second elastic element 3044 ensure that the floating sleeve assembly 304 floats up and down along the rotating shaft 303 and prevents the floating sleeve assembly 304 from sliding down to the lowest end of the rotating shaft 303 due to its own weight.

[0022] See further Figure 8 In this embodiment, the outer wall of the rotating shaft 303 is provided with a positioning groove 3032 along the axial direction, and the inner wall of the cover 3041 is provided with a positioning protrusion 3045 along the axial direction. When the cover sleeve 3042 is sleeved on the rotating shaft 303, the positioning protrusion 3045 is matched with the positioning groove 3032. In this way, the floating sleeve assembly 304 can slide up and down along the rotating shaft 303 and rotate with the rotating shaft 303.

[0023] See further Figure 3 and Figure 4In this embodiment, a guide frame 308 is fixed on the mounting base 201. Guide bearings are coaxially arranged on the upper and lower frame bars of the guide frame 308. The rotating shaft 303 slides through the bearing of the upper frame bar into the guide frame 308 and connects to the floating sleeve assembly 304. The sleeve 3042 slides through the bearing of the lower frame bar out of the guide frame 308 and connects to the eccentric mechanism 306. The guide frame 308 can ensure the stability of the floating sleeve assembly and the thread gauge 307 moving up and down. In order to better detect the position of the floating sleeve assembly 304, a position sensor 305 is set on the guide frame 308. The position sensor 305 monitors the position of the sleeve cover 3041 and feeds back the position information to the transfer mechanism 200, thereby improving the accuracy of position detection.

[0024] See further Figure 1 and Figure 2 In this embodiment, a pneumatic nozzle 202 is provided on the mounting base 201, and the pneumatic nozzle 202 is directed toward the thread gauge 307 to clean the iron filings or dust on the thread gauge 307; a turntable 102 is provided on the base 100, and several material tables 101 are arranged on the turntable 102. The turntable 102 is driven by a motor to rotate automatically, realizing automatic cyclic detection of workpieces and improving detection efficiency.

[0025] More specifically, in this embodiment, a lifting cylinder 103 is provided on the base 100, and a pressure gauge 104 is connected to the top movable end of the lifting cylinder 103. When the thread gauge 307 rotates and lifts out of the thread hole, the lifting cylinder 103 drives the pressure gauge 104 to press down on the workpiece to be inspected, so as to prevent the thread gauge 307 from taking the workpiece away from the material table 101.

[0026] See further Figure 2 In this embodiment, the transfer mechanism 200 includes a left-right linear sliding module 203, a front-back linear sliding module 204 on the slider of the left-right linear sliding module 203, and a vertical linear sliding module 205 on the slider of the front-back sliding module. The mounting base 201 is mounted on the slider of the vertical linear sliding module 205. The left-right linear sliding module 203, the front-back linear sliding module 204, and the vertical linear sliding module 205 are all electrically connected to the central controller. Each of the left-right linear sliding module 203, the front-back linear sliding module 204, and the vertical linear sliding module 205 is equipped with a position sensor electrically connected to the central controller to ensure that the thread gauge 307 moves to directly above the screw hole of the workpiece to be inspected. The rotary motor 301, the torque sensor 302, and the position sensor 305 are also electrically connected to the central controller, improving the intelligence and automation of the device.

[0027] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.

[0028] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. In the description of this application, "multiple" and "several" are understood as "at least two." "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. A connected to B can represent: A and B directly connected, and A and B connected through C. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

Claims

1. A thread inspection device, comprising a base (100), a material platform (101) and a transfer mechanism (200) disposed on the base (100), wherein the material platform (101) carries a workpiece to be inspected, and a mounting seat (201) is disposed at the movable end of the transfer mechanism (200), and a thread inspection mechanism (300) is disposed on the mounting seat (201), characterized in that, The thread detection mechanism (300) includes a rotary motor (301), the movable end of which is connected to a vertically downward rotating shaft (303) via a torque sensor (302); a floating sleeve assembly (304) is fitted on the rotating shaft (303), the floating sleeve assembly (304) slides up and down along the rotating shaft (303) and rotates with the rotating shaft (303), a position sensor (305) is provided on the mounting base (201) to detect the position of the floating sleeve assembly (304) on the rotating shaft (303); an eccentric mechanism (306) is provided at the bottom of the floating sleeve assembly (304), the eccentric mechanism (306) includes a tapered sleeve (3061) with its tip pointing downward, the tapered sleeve (3061) being coaxial and gapped inside. The device is equipped with a tapered movable head (3062) with its pointed tip pointing downwards. A chuck (3063) is provided at the bottom of the tapered movable head (3062), and a thread gauge (307) is installed on the chuck (3063). The transfer mechanism (200) drives the thread gauge (307) to press down onto the threaded hole of the workpiece to be inspected. The rotary motor (301) drives the rotary shaft (303) to rotate the floating sleeve assembly (304), the eccentric mechanism (306), and the thread gauge (307). The torque sensor (302) monitors the torque fed back by the rotary shaft (303). The position sensor (305) feeds back the position information of the floating sleeve assembly (304) to the transfer mechanism (200). The transfer mechanism (200) drives the rotary shaft (303) to move accordingly.

2. The thread detection device according to claim 1, characterized in that, The conical sleeve (3061) has a limiting groove (3064) on its side wall, and the conical movable head (3062) has a limiting block (3065) on its side wall. The limiting block (3065) passes through the limiting groove (3064) to limit the movement space of the conical movable head (3062) within the conical sleeve (3061).

3. The thread detection device according to claim 1, characterized in that, The floating sleeve assembly (304) includes a cylindrical cover (3041) and a cylindrical sleeve (3042) that are coaxially and fixedly connected at their upper and lower positions. The rotating shaft (303) slides through the cylindrical cover (3041) from the axis and passes into the cylindrical sleeve (3042). The eccentric mechanism (306) is disposed at the bottom of the cylindrical sleeve (3042). A balance head (3031) is fixedly disposed at the end of the rotating shaft (303). A first elastic element (3043) is disposed between the balance head (3031) and the cylindrical cover (3041). A second elastic element (3044) is disposed between the balance head (3031) and the bottom surface of the inner wall of the cylindrical sleeve (3042). The first elastic element (3043) and the second elastic element (3044) drive the floating sleeve assembly (304) to float up and down along the rotating shaft (303).

4. A thread detection device according to claim 3, characterized in that, The outer wall of the rotating shaft (303) is provided with a positioning groove (3032) along the axial direction, and the inner wall of the cover (3041) is provided with a positioning protrusion (3045) along the axial direction. When the cover sleeve (3042) is sleeved on the rotating shaft (303), the positioning protrusion (3045) is matched with the positioning groove (3032) so that the floating sleeve assembly (304) slides up and down along the rotating shaft (303) while rotating with the rotating shaft (303).

5. A thread detection device according to claim 4, characterized in that, A guide frame (308) is fixed on the mounting base (201). Guide bearings are coaxially arranged on the upper and lower frame bars of the guide frame (308). The rotating shaft (303) slides through the bearing of the upper frame bar into the guide frame (308) and is connected to the floating sleeve assembly (304). The sleeve (3042) slides through the bearing of the lower frame bar out of the guide frame (308) and is connected to the eccentric mechanism (306). The position sensor (305) is arranged on the guide frame (308) to monitor the position of the sleeve cover (3041) and feed the position information back to the transfer mechanism (200).

6. A thread detection device according to claim 5, characterized in that, A pneumatic nozzle (202) is provided on the mounting base (201), and the pneumatic nozzle (202) is oriented toward the thread gauge (307).

7. A thread detection device according to claim 1, characterized in that, A turntable (102) is provided on the base (100), and a plurality of material tables (101) are provided on the turntable (102).

8. A thread detection device according to claim 7, characterized in that, A lifting cylinder (103) is provided on the base (100). A pressure gauge (104) is connected to the top movable end of the lifting cylinder (103). The lifting cylinder (103) drives the pressure gauge (104) to press down on the workpiece to be inspected.

9. A thread detection device according to any one of claims 1-8, characterized in that, The transfer mechanism (200) includes a left and right linear sliding module (203), and a front and rear linear sliding module (204) is provided on the slider of the left and right linear sliding module (203). An up and down linear sliding module (205) is provided on the slider of the front and rear sliding module. The mounting base (201) is provided on the slider of the up and down linear sliding module (205).

10. A thread detection device according to claim 9, characterized in that, The left and right linear sliding modules (203), front and rear linear sliding modules (204), and up and down linear sliding modules (205) are all electrically connected to the central controller. The left and right linear sliding modules (203), front and rear linear sliding modules (204), and up and down linear sliding modules (205) are all equipped with position sensors that are electrically connected to the central controller to ensure that the thread gauge (307) moves to the top of the screw hole of the workpiece to be inspected. The rotary motor (301), torque sensor (302), and position sensor (305) are also electrically connected to the central controller.

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