Thread detection device and detection method based on torque and go gauge measurement

Abstract

The invention discloses a thread detection device and method based on torque and go gauge measurement. The thread detection device comprises a lifting cylinder, a balance cylinder, a lifting support and a detection assembly. The detection assembly comprises a detection motor, a shaft sleeve, a multi-section parallel line coupler, a detection head and a detection rod; the lifting cylinder drives the detection assembly to descend, the balance cylinder counteracts gravitational acceleration of the detection assembly, the multiple sections of parallel line couplings are connected through longitudinal connecting pins, and first radial gaps are formed between the parallel line couplings and the shaft sleeves; a second radial gap is formed between the detection head and the middle hole of the shaft sleeve, the detection rod is fixedly arranged in the middle hole of the detection head, the shaft sleeve is provided with a plurality of elastic bolts which are uniformly distributed in the radial direction, and the inner ends of the elastic bolts abut against the detection head to fix the detection head in the shaft sleeve; in a free state, a circle defined by the end faces of the elastic bolts is coaxial with the middle hole of the shaft sleeve. And horizontal position and angle compensation when the threaded hole to be measured is not coaxial with the output shaft of the motor is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of thread detection, and in particular to a thread detection device and method based on torque and go gauge measurement. Background Art

[0002] With the continuous development of the manufacturing industry, the quality inspection of threaded workpieces has become increasingly critical. Accurate and efficient thread inspection not only improves product quality and ensures product performance and safety, but also helps companies optimize production processes and reduce costs. However, current thread inspection equipment has exposed many shortcomings in practical applications, urgently requiring improvement and innovation.

[0003] In existing technologies, thread detection mainly relies on manual inspection and machine vision inspection. Manual inspection has many disadvantages. On the one hand, it relies on the operator's skills and experience, and the inspection results are easily affected by factors such as operator fatigue and operating proficiency, resulting in large errors. On the other hand, when detecting the number of thread turns, the operator needs to count accurately, and long-term operation is prone to counting errors. In addition, although machine vision inspection can eliminate human errors, its detection principle and the limitations of thread shape mean that it can only detect the number of thread turns and the approximate appearance, making it difficult to accurately judge the thread size. Recent patent literature has revealed the direction of improvement for thread detection equipment within the industry.

[0004] Patent document 1 (CN113551574B) discloses a metal product thread detection device, which includes a jamming protection mechanism, an installation mechanism and a detection mechanism. The jamming protection mechanism is an anti-jamming function that is realized by a PLC servo-controlled motor; specifically: when the PLC monitors that the torque of the thread gauge screwed into the threaded hole exceeds the set value; the PLC controls the servo to reverse and exit so that the thread gauge is separated from the part; the PLC determines whether the thread is slipping or blocked by monitoring the thread gauge screwing torque. The jamming protection mechanism has two parts that can be combined or separated, the installation mechanism has a thread gauge installation sleeve, and the detection mechanism includes components such as the thread gauge. It can not only detect the number of thread turns, but also the thread size. When encountering a product with a missing number of thread turns, the jamming protection mechanism can disengage the part to form a protection, and will produce a metal impact sound to alert the operator.

[0005] Patent Document 2 (CN113503789A) discloses a floating mechanism for thread inspection. This mechanism comprises a mounting head and a floating connector. The floating connector is connected to the mounting head via a transmission connection structure and can float radially or axially. This design prevents the go / no-go inspection tool from compensating for threaded hole misalignment that could prevent the thread gauge from being inserted.

[0006] Patent Document 3 (CN211120914U) discloses a monitorable thread go / no-go device, comprising a servo drive, torque detection, displacement detection, and a floating mechanism for thread go / no-go detection. The floating mechanism eliminates translational offset through a gap-type connection between a hexagonal flange and a hexagonal hole. The elastic restoring force of a rubber ring eliminates the tilt angle between the go / no-go gauge's center axis and the thread's center axis, achieving a floating function and enabling monitoring of torque and displacement data.

[0007] While the aforementioned patents employ technical means to perform floating corrections on the height and horizontal position of the detection head, in actual testing, if there are complex deviations in the position and angle of the threaded workpiece, relying solely on radial and axial floating motion may not fully guarantee accurate alignment between the detection head center and the thread center. Furthermore, because the downward movement of the detection head relies on a motor and torque is typically used to detect the thread state, factors such as downward acceleration and inertia during this process affect detection accuracy, leading to deviations in the test data. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to provide a thread detection device based on torque and go gauge measurement, so as to accurately inspect the state of the thread by accurately measuring the rotational torque.

[0009] The technical solution adopted by the present invention to solve the above technical problems is: a thread detection device based on torque and go gauge measurement,

[0010] Including lifting cylinder, balancing cylinder, lifting bracket and detection components;

[0011] The detection assembly includes a detection motor, a shaft sleeve, a multi-section parallel line coupling, a detection head and a detection rod;

[0012] The detection motor is arranged on a lifting bracket, and the lifting bracket is connected to a first piston rod extending downward from the lifting cylinder and a second piston rod extending downward from the balancing cylinder;

[0013] The shaft sleeve is fixed on the lifting bracket, the parallel line couplings are arranged side by side up and down, the detection head is located below the parallel line couplings, and the parallel line couplings and the detection head are arranged in the middle hole of the shaft sleeve;

[0014] The multiple sections of the parallel line coupling are connected by longitudinal connecting pins. There is a first radial gap between the parallel line coupling and the shaft sleeve; there is a second radial gap between the detection head and the hole in the shaft sleeve.

[0015] The output shaft of the detection motor is plugged into the middle hole of the uppermost parallel line coupling, and the connecting shaft of the detection head is plugged into the middle hole of the lowermost parallel line coupling;

[0016] The detection rod is fixed in the middle hole of the detection head, and the sleeve is provided with a plurality of elastic bolts uniformly distributed in the radial direction, and the inner ends of the elastic bolts abut against the detection head so that the detection head is fixed in the sleeve;

[0017] In the free state, the circle enclosed by the end faces of the elastic bolts is coaxial with the center hole of the sleeve, thereby achieving horizontal position and angle compensation when the threaded hole to be measured is not coaxial with the motor output shaft.

[0018] The preferred technical solution adopted by the present invention to solve the above technical problems is: a thread detection device based on torque and go gauge measurement includes a vertical mounting frame, the vertical mounting frame is provided with a vertical guide rail, and the lifting bracket is provided with a slider matching the vertical guide rail.

[0019] The preferred technical solution adopted by the present invention to solve the above technical problem is: the lifting cylinder and the balancing cylinder are arranged on a horizontal mounting seat fixed on the vertical mounting frame.

[0020] The preferred technical solution adopted by the present invention to solve the above technical problems is: the balancing cylinder includes a balancing cylinder body, a balancing piston, a second piston rod extending downward from the balancing piston, and a third piston rod extending downward from the balancing piston.

[0021] The preferred technical solution adopted by the present invention to solve the above technical problem is: the vertical mounting frame is provided with an upper limit portion and a lower limit portion for limiting the upper and lower displacement strokes of the vertical mounting frame respectively.

[0022] The preferred technical solution adopted by the present invention to solve the above technical problems is as follows: the lifting bracket includes a vertical plate and a horizontal plate, the horizontal plate is provided with a stepped recess, and a mounting through hole is provided in the middle of the stepped recess;

[0023] The housing of the detection motor is fixed to the transverse plate, and a protrusion is provided below the housing, and the protrusion is engaged with the stepped recess;

[0024] A convex ring is provided on the outer periphery of the upper section of the shaft sleeve, and an annular convex edge is provided on the upper side of the convex ring. The annular convex edge is inserted into the mounting through hole, and the convex ring is abutted against the lower surface of the transverse plate, and the convex ring is fixed to the stepped recess.

[0025] The preferred technical solution adopted by the present invention to solve the above technical problem is: a bearing is provided outside the output shaft of the detection motor.

[0026] The preferred technical solution adopted by the present invention to solve the above technical problems is: a detection method of a thread detection device based on torque and go gauge measurement, comprising the following steps:

[0027] The lifting cylinder and the balancing cylinder are in their initial positions, and the lifting bracket is at its starting height;

[0028] Compressed air is introduced into the upper air chamber of the lifting cylinder to push the first piston downward, and the lifting bracket drives the detection component to begin to descend;

[0029] Both air chambers of the balancing cylinder are in a ready state, and the second piston rod is connected to the lifting bracket to move the balancing piston downward;

[0030] The detection rod approaches the workpiece, and the detection motor starts to run;

[0031] Introducing rated compressed air into the lower air chamber of the balancing cylinder to generate an upward force on the balancing piston to offset the gravity of the lifting bracket and the detection assembly;

[0032] The detection rod adaptively enters the threaded hole to be detected, and realizes detection by detecting the load torque of the motor.

[0033] Compared with the existing technology, the advantages of the present invention are: the balancing cylinder offsets the gravitational acceleration of the detection component, so that the detection can smoothly apply torque for thread detection during the detection process, avoiding the impact or excessive extrusion of the threaded hole by the detection head due to gravity, affecting the detection accuracy; the arrangement of the sleeve, parallel line coupling, detection head and multiple elastic bolts provides detection position and angle compensation, which can adapt to the position changes of the workpiece and help improve the detection accuracy and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The present invention will be described in further detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will appreciate that these drawings are drawn only for the purpose of explaining the preferred embodiments and should not be construed as limiting the scope of the present invention. Furthermore, unless otherwise specified, the drawings are merely schematic representations of the composition or structure of the depicted objects and may include exaggerated representations. Furthermore, the drawings are not necessarily drawn to scale.

[0035] Figure 1 Schematic diagram of a thread detection device based on torque and go gauge measurement Figure 1 ;

[0036] Figure 2 Schematic diagram of a thread detection device based on torque and go gauge measurement Figure 2 ;

[0037] Figure 3 Schematic diagram of a thread detection device based on torque and go gauge measurement Figure 3 ;

[0038] Figure 4An exploded view of a thread inspection device based on torque and go gauge measurement;

[0039] Figure 5 A cross-sectional view of a thread detection device based on torque and go gauge measurement;

[0040] Figure 6 An exploded view of a thread inspection device based on torque and go gauge measurement;

[0041] Figure 7 This is a partially enlarged view of a thread detection device based on torque and go gauge measurement.

[0042] Reference numerals:

[0043] Lifting cylinder 1; balancing cylinder 2; lifting bracket 3; detection motor 4; bushing 5; parallel line coupling 6; detection head 7; detection rod 8; first piston rod 101; second piston rod 201; longitudinal connecting pin 9; output shaft 41; uppermost parallel line coupling 61; lowermost parallel line coupling 62; elastic bolt 13; balancing piston 202; vertical mounting frame 10, vertical guide rail 11, slider 12; horizontal mounting seat 15; vertical plate 31; horizontal plate 32; stepped recess 20; mounting through hole 21; raised portion 17; convex ring 18; annular convex edge 19; bearing 23; balancing cylinder body 204; third piston rod 203. DETAILED DESCRIPTION

[0044] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are merely illustrative and exemplary and should not be construed as limiting the scope of protection of the present invention.

[0045] It should be noted that similar reference numerals denote similar items in the following figures. Therefore, once an item is defined in one figure, it will not be further defined or explained in the subsequent figures. In order to more clearly illustrate the structure, the proportions of the components in the figures are not true to scale.

[0046] In the description of the present invention, it should be noted that the terms "upper," "lower," "front," "back," "left," "right," "inner," and "outer" and the like, indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is typically placed when in use. These terms are intended solely to facilitate the description of the present invention and to simplify the description, and are not intended to indicate or imply that the devices or components referred to must have a specific direction, be constructed, or operate in a specific direction. Therefore, they should not be construed as limitations on the present invention. The terms "first" and "second" are used solely to facilitate understanding and have no other directional meanings, and should not be construed as limitations on the present invention.

[0047] like Figure 1-6As shown, this embodiment discloses a thread detection device based on torque and go gauge measurement, comprising a lift cylinder 1, a balancing cylinder 2, a lift bracket 3, and a detection assembly. The detection assembly includes a detection motor 4, a bushing 5, a multi-section parallel line coupling 6, a detection head 7, and a detection rod 8. The detection motor 4 is mounted on the lift bracket 3, which connects a first piston rod 101 extending downward from the lift cylinder 1 and a second piston rod 201 extending downward from the balancing cylinder 2.

[0048] like Figure 5 As shown, the sleeve 5 is fixed to the lifting bracket 3, with parallel line couplings 6 arranged side by side. The detection head 7 is located below the parallel line couplings 6. The parallel line couplings 6 and the detection head 7 are located in the center hole of the sleeve 5. The multiple parallel line couplings 6 are connected by longitudinal connecting pins 9. A first radial clearance is defined between the parallel line couplings 6 and the sleeve 5, with the abutting surfaces of each parallel line coupling 6 abutting against each other. A second radial clearance is defined between the detection head 7 and the center hole of the sleeve 5.

[0049] As shown in Figure 5, the output shaft 41 of the detection motor 4 is plugged into the middle hole of the uppermost parallel line coupling 61, and the connecting shaft of the detection head 7 is plugged into the middle hole of the lowermost parallel line coupling 62. Figure 7 As shown, the red dotted line is the initial axial direction, and the green line is the way in which the parallel line coupling achieves horizontal position compensation through angle compensation. That is to say, the parallel line coupling uses its own elasticity to achieve deflection at different angles relative to the axial direction, and multiple parallel line couplings working together can also superimpose this angular deflection into a translational adjustment of the horizontal position.

[0050] Testing rod 8 is fixed within the center hole of testing head 7. Bushing 5 is equipped with multiple radially evenly spaced elastic bolts 13. The inner ends of the elastic bolts 13 contact the testing head 7, securing it within bushing 5. In the free state, the circle enclosed by the end faces of each elastic bolt 13 is coaxial with the center hole of bushing 5. Combined with the adjustment of multiple parallel line couplings, this allows for horizontal position and angle compensation when the threaded hole to be tested is misaligned with the motor output shaft 41.

[0051] like Figure 1-4 As shown, lift cylinder 1 drives lift bracket 3 and the inspection assembly downward, enabling inspection head 7 to contact the threaded hole to be tested. Balancing cylinder 2 counteracts the acceleration due to gravity on the inspection assembly, enabling inspection head 7 to smoothly apply torque for thread testing during the inspection process. This prevents gravity-induced impact or excessive compression of the threaded hole by inspection head 7, which could affect inspection accuracy. These two cylinders work in tandem, ensuring the proper operation of the inspection assembly from the perspectives of power drive and force balance, respectively, complementing each other in terms of functionality.

[0052] The detection motor 4 serves as a power source, driving the parallel line coupling 6 and the detection head 7 to rotate, and then driving the detection rod 8 to rotate in the threaded hole. The thread quality is judged by measuring the torque during rotation. This is a key component for realizing torque measurement. It is set on the lifting bracket 3 and can move with the lifting bracket 3, which is convenient for detecting threaded holes at different heights, and has a clear functional positioning.

[0053] The output shaft 41 of the detection motor 4 is precisely connected to the top-level parallel line coupling 61 to ensure the stability of power transmission. The multi-section parallel line coupling 6 is connected in sequence through the longitudinal connecting pin 9 to form a complete and flexible transmission chain. The design of the multi-section parallel line coupling 6 allows compensation for axial and angular deviations to a certain extent. Through the longitudinal connecting pin 9, the rotational motion of the detection motor 4 can be transmitted to the detection head 7. At the same time, there is a first radial gap between the parallel line coupling 6 and the sleeve 5, which provides a certain floating space for the parallel line coupling 6, helps to adapt to the position deviation of the threaded hole, reduces the measurement error caused by poor alignment, and logically meets the actual detection needs.

[0054] like Figure 5 As shown, the test head 7 is located below the parallel line coupling 6, and its connecting shaft is firmly plugged into the lowest level parallel line coupling 6, ensuring accurate torque transmission. A detection rod 8 is fixed within the center hole of the test head 7, directly contacting the threaded hole to be tested. The external thread of the detection rod 8 matches the internal thread of the threaded hole to be tested, preparing for subsequent thread engagement and realizing torque detection of the threaded hole. This design can transmit torque to the threaded hole and simultaneously reflect the quality of the thread by detecting the load changes of the motor 4.

[0055] The sleeve 5 provides a channel for installing and guiding the parallel line coupling 6 and the detection head 7. There are first and second radial gaps between its inner hole and the parallel line coupling 6 and the detection head 7, respectively, which provide space for the floating and angle compensation of the components. The multiple elastic bolts 13 on the sleeve 5 are evenly distributed, and their inner ends contact the detection head 7 in the free state, forming a uniform pre-tightening force, so that the detection head 7 is stably fixed in the sleeve 5. At the same time, the circle formed by the end faces of the elastic bolts 13 remains coaxial with the center hole of the sleeve 5, ensuring that in the initial state, the central axis of the detection assembly is consistent with the central axis of the motor output shaft 41, providing a reference for subsequent position and angle compensation. During the detection process, the elastic bolts 13 can adapt to the position changes of the detection head 7, play a certain buffering and compensation role, and help improve the accuracy and reliability of the detection.

[0056] The detection method of the thread detection device based on torque measurement includes the following steps:

[0057] In the initial preparation stage, the lifting cylinder 1 and the balancing cylinder 2 are both in the initial state, their piston rods are respectively in the retracted standby position, and the lifting bracket 3 is at the starting height, ensuring that the entire detection assembly is at the predetermined starting height.

[0058] Compressed air is then introduced into the upper chamber of lift cylinder 1, activating it and pushing the first piston downward. Lift bracket 3 then lowers the inspection assembly, gradually bringing inspection head 7 closer to the threaded hole to be tested. Simultaneously, the second piston rod 201 of balancing cylinder 2 extends downward. Both chambers of balancing cylinder 2 are now in a ready state. Second piston rod 201, connected by lift bracket 3, causes balancing piston 202 to move downward.

[0059] When the detection rod 8 approaches the workpiece and brings the lifting bracket 3 to the preset position, rated compressed air is introduced into the lower air chamber of the balancing cylinder 2, generating a force on the balancing piston 202. This force offsets the upward force of the gravity of the lifting bracket 3 and the detection assembly through the second piston rod 201.

[0060] At the same time, as the approach detection rod 8 approaches the workpiece, the detection motor 4 starts running, and the detection rod 8 adaptively enters the threaded hole to be tested, performing the test by detecting the load torque of the detection motor 4. Alternatively, when the detection rod 8 of the detection head 7 contacts the threaded hole to be tested, the detection motor 4 has not yet started. At this time, the load change of the detection motor 4 can be used to preliminarily determine whether there are obvious burrs or foreign objects at the threaded hole. If there is a large resistance at the threaded hole, the initial load of the motor will increase abnormally, which can be detected and an alarm can be triggered by the motor's overload protection mechanism or torque monitoring system.

[0061] During the test, the test motor 4 starts and rotates at a low speed. The torque it outputs is gradually transmitted to the test head 7 via the parallel line coupling 6, driving the test rod 8 to rotate within the threaded hole. At this point, the test rod 8 begins to engage with the internal threads of the threaded hole. As the rotation continues, the shape and size of the threads directly affect the magnitude and change trend of the torque.

[0062] During the detection process, since the threaded hole to be measured may have a slight position and angle deviation from the motor output shaft 41, the detection component can adaptively correct the deviation. When the hole to be measured is not coaxial with the detection rod 8, the detection rod 8 is subjected to lateral force, pushing the detection head 7 to shift laterally in the sleeve 5, compressing the elastic bolt 13 on the corresponding side. The multi-section parallel line coupling 6 is connected by a longitudinal pin, allowing a small inclination angle to be generated between the detection head 7 and the motor output shaft 41. The elastic bolt 13 retracts under pressure, releasing the freedom of the detection head 7; the bolt on the unpressurized side remains pre-tightened, forming a three-point dynamic balance, ensuring that the detection rod 8 and the threaded hole are gradually aligned. After the compensation is completed, the elastic bolt 13 temporarily fixes the detection head 7 in the corrected position through the pre-tightening force, maintaining the detection rod 8 coaxial with the threaded hole, thereby improving the detection accuracy.

[0063] Throughout the rotation process, the torque sensor equipped with detection motor 4 monitors torque changes in real time and transmits the data to the control system. The control system analyzes the torque data and determines whether various parameters of the threaded hole, such as the number of turns, pitch, and thread profile, meet standards based on the torque magnitude and changing trends, and whether there is any problem such as thread wear, deformation, or blockage.

[0064] After the detection is completed, the piston rods of the lifting cylinder 1 and the balancing cylinder 2 retract synchronously under the command of the control system, driving the lifting bracket 3 and the detection component to rise steadily, so that the detection head 7 withdraws from the threaded hole.

[0065] After the inspection is complete, the control system generates a detailed inspection report based on the collected torque data, including information such as the quality status of the threaded hole, the specific location and type of defects, and provides timely feedback to the operator via a display or alarm device. If the threaded hole is in good condition, the device automatically records the acceptance information. If a failure is detected, the system triggers the corresponding processing mechanism according to the pre-set program, such as stopping the production line and marking the failed product.

[0066] like Figure 1-5 As shown, the device includes a vertical mounting frame 10, which is equipped with a vertical guide rail 11. The lifting bracket 3 is equipped with a slider 12 that matches the vertical guide rail 11. The slider 12 can slide smoothly along the vertical guide rail 11, ensuring the verticality and stability of the lifting bracket 3 during the lifting process. The vertical mounting frame 10 is equipped with an upper limit portion and a lower limit portion that respectively limit the vertical displacement of the vertical mounting frame 10. The upper limit portion and the lower limit portion can be in the form of mechanical blocks, photoelectric sensors, or magnetic induction switches to ensure that the lifting bracket 3 moves within the set travel range and prevent damage to the equipment due to excessive lifting.

[0067] like Figure 1-5 As shown, the lifting cylinder 1 and the balancing cylinder 2 are arranged on a transverse mounting base 15 fixed to the vertical mounting frame 10. The transverse mounting base 15 is made of thick steel plate or cast iron, which has sufficient strength and rigidity to stably support the cylinder and withstand various loads during operation.

[0068] like Figure 1-6As shown, the lifting bracket 3 includes a vertical plate 31 and a horizontal plate 32. The horizontal plate 32 is provided with a stepped recess 20, and a mounting hole 21 is provided in the middle of the stepped recess 20. The casing of the detection motor 4 is fixed to the horizontal plate 32, and a protrusion 17 is provided below the casing, which engages with the stepped recess 20. A convex ring 18 is provided on the outer periphery of the upper section of the shaft sleeve 5, and an annular ridge 19 is provided on the upper side of the convex ring 18. The annular ridge 19 is inserted into the mounting hole 21, and the convex ring 18 abuts against the lower surface of the horizontal plate 32, and is fixed between the convex ring 18 and the stepped recess 20. This interlocking design can ensure that the detection motor 4 and the shaft sleeve 5 are stably fixed during operation, reduce vibration and displacement, improve detection accuracy, and facilitate disassembly and replacement.

[0069] like Figure 5-6 As shown, a bearing 23 is provided outside the output shaft 41 of the detection motor 4. The bearing 23 adopts a high-precision deep groove ball bearing 23 or an angular contact ball bearing 23, which can withstand radial and axial loads, ensure the rotation accuracy of the output shaft 41 of the detection motor 4, and extend the service life of the detection motor 4.

[0070] like Figure 4 As shown, the balancing cylinder 2 includes a balancing cylinder body 204 , a balancing piston 202 , a second piston rod 201 extending downward from the balancing piston 202 , and a third piston rod 203 extending downward from the balancing piston 202 .

[0071] The present invention has been described as a thread detection device and method based on torque and go gauge measurement. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The above examples are intended only to facilitate understanding of the present invention and its core concepts. It should be noted that those skilled in the art may make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications fall within the scope of protection of the claims.

Claims

1. A thread detection device based on torque and go gauge measurement, characterized in that: Including lifting cylinder, balancing cylinder, lifting bracket and detection components; The detection assembly includes a detection motor, a shaft sleeve, a multi-section parallel line coupling, a detection head and a detection rod; The detection motor is arranged on a lifting bracket, and the lifting bracket is connected to a first piston rod extending downward from the lifting cylinder and a second piston rod extending downward from the balancing cylinder; The shaft sleeve is fixed on the lifting bracket, the parallel line couplings are arranged side by side up and down, the detection head is located below the parallel line couplings, and the parallel line couplings and the detection head are arranged in the middle hole of the shaft sleeve; The multiple parallel line couplings are connected by longitudinal connecting pins, and the butt joint surfaces of the parallel line couplings are offset against each other. There is a first radial gap between the parallel line coupling and the sleeve; there is a second radial gap between the detection head and the hole in the sleeve. The output shaft of the detection motor is plugged into the middle hole of the uppermost parallel line coupling, and the connecting shaft of the detection head is plugged into the middle hole of the lowermost parallel line coupling; The detection rod is fixed in the middle hole of the detection head, and the sleeve is provided with a plurality of elastic bolts uniformly distributed in the radial direction, and the inner ends of the elastic bolts abut against the detection head so that the detection head is fixed in the sleeve; In a free state, a circle enclosed by the end faces of the elastic bolts is coaxial with the center hole of the sleeve.

2. A thread detection device based on torque and go gauge measurement according to claim 1, characterized in that: It comprises a vertical mounting frame, the vertical mounting frame is provided with a vertical guide rail, and the lifting bracket is provided with a sliding block matching the vertical guide rail.

3. The thread detection device based on torque and go gauge measurement according to claim 2, characterized in that: The lifting cylinder and the balancing cylinder are arranged on a transverse mounting seat fixed on the vertical mounting frame.

4. The thread detection device based on torque and go gauge measurement according to claim 1, characterized in that: The balancing cylinder includes a balancing cylinder body, a balancing piston, a second piston rod extending downward from the balancing piston, and a third piston rod extending downward from the balancing piston.

5. The thread detection device based on torque and go gauge measurement according to claim 2, characterized in that: The vertical mounting frame is provided with an upper limit portion and a lower limit portion for limiting the upper and lower displacement strokes of the vertical mounting frame respectively.

6. The thread detection device based on torque and go gauge measurement according to claim 1, characterized in that: The lifting bracket includes a vertical plate and a horizontal plate, the horizontal plate is provided with a stepped recess, and a mounting through hole is provided in the middle of the stepped recess; The housing of the detection motor is fixed to the transverse plate, and a protrusion is provided below the housing, and the protrusion is engaged with the stepped recess; A convex ring is provided on the outer periphery of the upper section of the shaft sleeve, and an annular convex edge is provided on the upper side of the convex ring. The annular convex edge is inserted into the mounting through hole, and the convex ring is abutted against the lower surface of the transverse plate, and the convex ring is fixed to the stepped recess.

7. The thread detection device based on torque and go gauge measurement according to claim 1, characterized in that: A bearing is arranged outside the output shaft of the detection motor.

8. A detection method for a thread detection device based on torque and go gauge measurement according to any one of claims 1 to 7, characterized in that The steps include: The lifting cylinder and the balancing cylinder are in their initial positions, and the lifting bracket is at its starting height; Compressed air is introduced into the upper air chamber of the lifting cylinder to push the first piston downward, and the lifting bracket drives the detection component to begin to descend; Both air chambers of the balancing cylinder are in a ready state, and the second piston rod is connected to the lifting bracket to move the balancing piston downward; The detection rod approaches the workpiece, and the detection motor starts to run; Introducing rated compressed air into the lower air chamber of the balancing cylinder to generate an upward force on the balancing piston to offset the gravity of the lifting bracket and the detection assembly; The detection rod adaptively enters the threaded hole to be detected, and realizes detection by detecting the load torque of the motor.

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