A thread inspection device based on torque and go gauge measurement

Abstract

This utility model discloses a thread inspection device based on torque and go gauge measurement, including a lifting cylinder, a balancing cylinder, a lifting bracket, and an inspection assembly. The inspection assembly includes an inspection motor, a bushing, a multi-section parallel line coupling, an inspection head, and an inspection rod. The lifting cylinder drives the inspection assembly to descend, and the balancing cylinder counteracts the gravitational acceleration of the inspection assembly. The multi-section parallel line coupling is connected by longitudinal connecting pins, and there is a first radial clearance between the parallel line coupling and the bushing. There is a second radial clearance between the inspection head and the central hole of the bushing. The inspection rod is fixed in the central hole of the inspection head. The bushing is provided with multiple radially evenly distributed elastic bolts, and the inner ends of the elastic bolts abut against the inspection head to fix the inspection head in the bushing. In the free state, the circle enclosed by the end faces of each elastic bolt is coaxial with the central hole of the bushing. This achieves horizontal position and angle compensation when the thread hole to be tested is not coaxial with the motor output shaft.

Description

Technical Field

[0001] This utility model relates to the technical field of thread inspection, and in particular to a thread inspection device based on torque and go gauge measurement. Background Technology

[0002] With the continuous development of the manufacturing industry, the quality inspection of threaded workpieces has become increasingly critical. Accurate and efficient thread inspection can not only improve product quality and ensure product performance and safety, but also help enterprises optimize production processes and reduce production costs. However, current thread inspection equipment has revealed many shortcomings in practical applications, and urgently needs improvement and innovation.

[0003] In existing technologies, thread inspection mainly relies on manual inspection and machine vision inspection. Manual inspection has several drawbacks. On the one hand, it depends on the operator's skill and experience, and the inspection results are easily affected by factors such as operator fatigue and skill level, resulting in significant errors. On the other hand, when detecting the number of thread turns, operators need to count precisely, and counting errors are prone to occur during prolonged operation. Furthermore, although machine vision inspection can eliminate human error, 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 determine the thread size. Recent patent literature reveals the industry's direction for improving thread inspection equipment.

[0004] Patent document 1 (CN113551574B) discloses a thread inspection device for metal products. This device includes a jamming protection mechanism, a mounting mechanism, and a detection mechanism. The jamming protection mechanism's anti-jamming function is achieved through PLC servo control of a motor; specifically, when the PLC monitors that the torque of the thread gauge entering the threaded hole exceeds a set value, the PLC controls the servo to reverse and retract, causing the thread gauge to disengage from the part; the PLC determines whether the thread is stripped or blocked by monitoring the thread gauge's entering torque. The jamming protection mechanism has two parts that can be combined or separated: the mounting mechanism has a thread gauge mounting sleeve, and the detection mechanism includes the thread gauge and other components. It can detect not only the number of thread turns but also the thread size. When encountering a product with missing thread turns, the jamming protection mechanism can disengage the part, providing protection, and will produce a metallic clanging sound to alert the operator.

[0005] Patent document 2 (CN113503789A) discloses a floating mechanism for thread inspection, which includes 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 along the mounting head. This design prevents the thread gauge from being screwed in due to misalignment of the product's threaded hole during compensation when a go / no-go testing tool is needed.

[0006] Patent document 3 (CN211120914U) discloses a monitorable thread go / no-go detection device, which includes a servo drive section, a torque detection section, a displacement detection section, 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, and uses the elastic restoring force of a rubber ring to eliminate the tilt angle between the center axis of the go / no-go gauge and the center axis of the thread, thereby achieving the floating function and monitoring torque and displacement data.

[0007] While the aforementioned patents employ technical means to float and correct the height and horizontal position of the detection head, in actual testing, if the position and angle of the threaded workpiece exhibit complex deviations, relying solely on radial and axial floating may not guarantee precise alignment between the detection head center and the thread center. Furthermore, since the downward movement of the detection head relies on a motor, and torque is typically used to detect the thread condition, factors such as downward acceleration and inertia affect the detection accuracy, leading to deviations in the detection data. Utility Model Content

[0008] The technical problem to be solved by this utility model is to provide a thread inspection device based on torque and go gauge measurement, so as to accurately inspect the condition of the thread through accurate measurement of rotational torque.

[0009] The technical solution adopted by this utility model to solve the above-mentioned technical problems is: a thread detection device based on torque and go gauge measurement.

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

[0011] The detection assembly includes a detection motor, a bushing, a multi-section parallel line coupling, a detection head, and a detection rod.

[0012] The detection motor is mounted on the lifting bracket, which is connected to the first piston rod extending downward from the lifting cylinder and the second piston rod extending downward from the balance cylinder.

[0013] The bushing is fixed on the lifting bracket, the parallel line couplings are arranged side by side, the detection head is located below the parallel line couplings, and the parallel line couplings and the detection head are located in the middle hole of the bushing.

[0014] The multiple parallel line couplings are connected by longitudinal connecting pins, and there is a first radial clearance between the parallel line coupling and the bushing; the detection head has a second radial clearance with the central hole of the bushing.

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

[0016] The detection rod is fixed inside the central hole of the detection head, and the bushing is provided with a plurality of radially evenly distributed elastic bolts. The inner ends of the elastic bolts abut against the detection head so that the detection head is fixed inside the bushing.

[0017] In the free state, the circle enclosed by the end faces of each elastic bolt is coaxial with the central hole of the bushing; thus achieving horizontal position and angle compensation when the threaded hole to be tested is not coaxial with the motor output shaft.

[0018] The preferred technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a thread detection device based on torque and go gauge measurement includes a vertical mounting frame, a vertical guide rail is provided on the vertical mounting frame, and a lifting bracket is provided with a slider that matches the vertical guide rail.

[0019] The preferred technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: the lifting cylinder and the balancing cylinder are mounted on the horizontal mounting base fixed on the vertical mounting frame.

[0020] The preferred technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: the balancing cylinder includes a balancing cylinder body, a balancing piston, a second piston rod extending downward from the self-balancing piston, and a third piston rod extending downward from the self-balancing piston.

[0021] The preferred technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: the vertical mounting frame is provided with an upper limit part and a lower limit part that respectively limit the vertical displacement stroke of the vertical mounting frame.

[0022] The preferred technical solution adopted by this utility model to solve the above-mentioned 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 the stepped recess is provided with an installation through hole in the middle;

[0023] The housing of the detection motor is fixed to the horizontal plate, and a protrusion is provided on the lower part of the housing, which fits into the stepped recess.

[0024] The upper part of the bushing is provided with a convex ring on its outer periphery, and the upper side of the convex ring is provided with an annular convex edge. The annular convex edge is inserted into the mounting through hole, the convex ring abuts 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 this utility model to solve the above-mentioned technical problems is: a bearing is provided outside the output shaft of the detection motor.

[0026] Compared with the prior art, the advantages of this utility model are: the balance cylinder counteracts the gravitational acceleration of the detection component, thereby enabling the detection to apply torque smoothly for thread detection during the detection process, avoiding the impact or excessive compression of the detection head on the threaded hole due to gravity, which would affect the detection accuracy; the setting of bushing, parallel line coupling, detection head and multiple elastic bolts provides detection position and angle compensation, which can adapt to changes in the position of the workpiece and help improve the accuracy and reliability of the detection. Attached Figure Description

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be construed as limiting the scope of the present invention. Furthermore, unless specifically indicated, the drawings are only schematic representations of the composition or structure of the described objects and may include exaggerated displays, and the drawings are not necessarily drawn to scale.

[0028] Figure 1 A schematic diagram of a thread inspection device based on torque and go gauge measurements. Figure 1 ;

[0029] Figure 2 A schematic diagram of a thread inspection device based on torque and go gauge measurements. Figure 2 ;

[0030] Figure 3 A schematic diagram of a thread inspection device based on torque and go gauge measurements. Figure 3 ;

[0031] Figure 4 An exploded view of a thread inspection device based on torque and go gauge measurements;

[0032] Figure 5 A cross-sectional view of a thread inspection device based on torque and go gauge measurements;

[0033] Figure 6 An exploded view of a thread inspection device based on torque and go gauge measurements;

[0034] Figure 7 This is a partially enlarged view of a thread inspection device based on torque and go gauge measurements.

[0035] Figure label:

[0036] 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 bracket 10; Vertical guide rail 11; Slider 12; Horizontal mounting seat 15; Vertical plate 31; Horizontal plate 32; Stepped recess 20; Mounting through hole 21; Protrusion 17; Protruding ring 18; Annular protruding edge 19; Bearing 23; Balancing cylinder body 204; Third piston rod 203. Detailed Implementation

[0037] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are merely descriptive and exemplary and should not be construed as limiting the scope of protection of the present invention.

[0038] It should be noted that similar labels in the following figures indicate similar items; therefore, once an item is defined in one figure, it will not be further defined or explained in subsequent figures. For clarity of the structure, the proportions of the components in the figures are not actual proportions.

[0039] In the description of this utility model, it should be noted that the terms "upper," "lower," "front," "rear," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and 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 this utility model. Similarly, "first" and "second" are only for ease of understanding and have no other directional meaning, and cannot be considered as limitations on this utility model.

[0040] like Figure 1-6 As shown, this embodiment discloses a thread inspection device based on torque and go gauge measurement, including a lifting cylinder 1, a balancing cylinder 2, a lifting bracket 3, and an inspection assembly. The inspection assembly includes an inspection motor 4, a bushing 5, a multi-section parallel line coupling 6, an inspection head 7, and an inspection rod 8. The inspection motor 4 is mounted on the lifting bracket 3, which connects the first piston rod 101 extending downward from the lifting cylinder 1 and the second piston rod 201 extending downward from the balancing cylinder 2.

[0041] like Figure 5As shown, the bushing 5 is fixed to the lifting bracket 3, the parallel line couplings 6 are arranged side by side, and the detection head 7 is located below the parallel line couplings 6. The parallel line couplings 6 and the detection head 7 are located inside the central hole of the bushing 5. Multiple parallel line couplings 6 are connected by longitudinal connecting pins 9. There is a first radial clearance between the parallel line couplings 6 and the bushing 5, and the mating surfaces of each parallel line coupling 6 abut against each other. The detection head 7 has a second radial clearance with the central hole of the bushing 5.

[0042] As shown in Figure 5, the output shaft 41 of the detection motor 4 is inserted into the center hole of the uppermost parallel line coupling 61, and the connecting shaft of the detection head 7 is inserted into the center hole of the lowermost parallel line coupling 62. Figure 7 As shown, the red dotted line represents the initial axial direction, and the green line represents the way that the parallel line coupling achieves horizontal position compensation through angle compensation. In other words, the parallel line couplings achieve different angles of deflection relative to the axial direction through their own elasticity, and multiple parallel line couplings working together can also superimpose this angle deflection into a translational adjustment of the horizontal position.

[0043] The detection rod 8 is fixed inside the central hole of the detection head 7. The bushing 5 is provided with multiple radially evenly distributed elastic bolts 13. The inner ends of the elastic bolts 13 abut against the detection head 7 to fix the detection head 7 inside the bushing 5. In the free state, the circle enclosed by the end faces of each elastic bolt 13 is coaxial with the central hole of the bushing 5. With the adjustment of multiple parallel line couplings, they jointly achieve horizontal position and angle compensation when the threaded hole to be tested is not coaxial with the motor output shaft 41.

[0044] like Figure 1-4 As shown, the lifting cylinder 1 drives the lifting bracket 3 and the detection assembly to move downwards, allowing the detection head 7 to contact the threaded hole to be tested. The balancing cylinder 2 counteracts the gravitational acceleration of the detection assembly, thereby enabling the detection head 7 to smoothly apply torque for thread testing during the testing process. This avoids the impact or excessive compression of the threaded hole by the detection head 7 due to gravity, which would affect the testing accuracy. These two cylinders work together, ensuring the normal operation of the detection assembly from the perspectives of power drive and force balance, respectively, and their functions complement each other.

[0045] The detection motor 4 serves as the power source, driving the parallel line coupling 6 and the detection head 7 to rotate, which in turn drives the detection rod 8 to rotate inside the threaded hole. The quality of the thread is judged by measuring the torque during rotation. This is the key component for torque measurement. It is set on the lifting bracket 3 and can move together with the lifting bracket 3, making it convenient to detect threaded holes at different heights. Its function is clearly defined.

[0046] The output shaft 41 of the detection motor 4 is precisely connected to the uppermost parallel line coupling 61, ensuring the stability of power transmission. Multiple parallel line couplings 6 are connected sequentially via longitudinal connecting pins 9, forming a complete and flexible transmission chain. The design of the multiple parallel line couplings 6 allows for some compensation for axial and angular deviations. Connected via the longitudinal connecting pins 9, they transmit the rotational motion of the detection motor 4 to the detection head 7. Simultaneously, a first radial clearance exists between the parallel line coupling 6 and the bushing 5, providing a certain amount of floating space for the parallel line coupling 6. This helps accommodate positional deviations in the threaded holes, reducing measurement errors caused by misalignment, logically meeting actual testing requirements.

[0047] like Figure 5 As shown, the detection head 7 is located below the parallel line coupling 6, and its connecting shaft is firmly inserted into the lowest-level parallel line coupling 6 to ensure accurate torque transmission. The detection rod 8 is fixed inside the central hole of the detection 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 reflect the quality condition of the thread by detecting changes in the load of the motor 4.

[0048] The bushing 5 provides a channel for the installation and guidance of the parallel coupling 6 and the detection head 7. A first radial clearance and a second radial clearance exist between its inner hole and the parallel coupling 6 and the detection head 7, respectively, providing space for component floating and angular compensation. Multiple elastic bolts 13 are evenly distributed on the bushing 5, their inner ends abutting against the detection head 7 in a free state, forming a uniform preload to stably fix the detection head 7 within the bushing 5. Simultaneously, the circles formed by the end faces of the elastic bolts 13 remain coaxial with the central hole of the bushing 5, ensuring that in the initial state, the central axis of the detection assembly is aligned with the central axis of the motor output shaft 41, providing a reference for subsequent position and angular compensation. During the detection process, the elastic bolts 13 can adapt to changes in the position of the detection head 7, playing a certain buffering and compensation role, which helps improve the accuracy and reliability of the detection.

[0049] The detection method of this thread detection device based on torque measurement includes the following steps:

[0050] In the initial preparation stage, both the lifting cylinder 1 and the balancing cylinder 2 are in their initial state, with their piston rods in the retracted standby position and the lifting bracket 3 at the initial height, ensuring that the entire detection assembly is at the predetermined initial height.

[0051] Then, compressed air is introduced into the upper air chamber of the lifting cylinder 1, which activates the cylinder and pushes the first piston downward. The lifting bracket 3 then drives the detection component to descend, causing the detection head 7 to gradually approach the threaded hole to be tested. At the same time, the second piston rod 201 of the balancing cylinder 2 also extends downward. At this time, both chambers of the balancing cylinder 2 are in a ready state, and the second piston rod 201, connected to the lifting bracket 3, causes the balancing piston 202 to move downward.

[0052] When the detection rod 8 approaches the workpiece and the lifting bracket 3 is moved to the preset position, rated compressed air is introduced into the lower air chamber of the balance cylinder 2, which generates a force on the balance piston 202. This force counteracts the upward force of the lifting bracket 3 and the gravity of the detection component through the second piston rod 201.

[0053] Simultaneously, as the detection rod 8 approaches the workpiece, the detection motor 4 starts running, and the detection rod 8 adaptively enters the threaded hole to be inspected. Detection is achieved through the load torque of the detection motor 4. Alternatively, it can be designed so that when the detection rod 8 of the detection head 7 contacts the threaded hole, the detection motor 4 has not yet started. At this time, the load change of the detection motor 4 is used to initially determine whether there are obvious burrs or foreign objects at the threaded hole. If there is significant resistance at the threaded hole, the initial load of the motor will increase abnormally, which can be detected and alarmed in time through the motor's overload protection mechanism or torque monitoring system.

[0054] During the testing process, the testing motor 4 starts and rotates at low speed. Its output torque is transmitted to the testing head 7 through the parallel line coupling 6, driving the testing rod 8 to rotate inside the threaded hole. At this time, the testing rod 8 begins to mesh with the internal thread of the threaded hole. As the rotation continues, the shape and size of the thread directly affect the magnitude and trend of the torque.

[0055] During the testing process, since the threaded hole to be tested may have slight positional and angular deviations from the motor output shaft 41, the testing assembly can adaptively correct these deviations. When the hole to be tested is not coaxial with the testing rod 8, the testing rod 8 is subjected to a lateral force, pushing the testing head 7 to shift laterally within the bushing 5, compressing the elastic bolt 13 on the corresponding side. The multi-section parallel coupling 6, connected by longitudinal pins, allows for a slight tilt angle between the testing head 7 and the motor output shaft 41. The elastic bolt 13 retracts under pressure, releasing the degree of freedom of the testing head 7; the bolt on the uncompressed side remains pre-tightened, forming a three-point dynamic balance, ensuring that the testing rod 8 and the threaded hole gradually align. After compensation, the elastic bolt 13 temporarily fixes the testing head 7 in the corrected position through pre-tightening force, maintaining the coaxiality of the testing rod 8 and the threaded hole, thereby improving testing accuracy.

[0056] Throughout the rotation process, the torque sensor equipped with motor 4 monitors the torque changes in real time and transmits the data to the control system. The control system analyzes the torque data and uses the magnitude and trend of the torque to determine whether various parameters of the threaded hole, such as the number of thread turns, pitch, and thread profile, meet the standards, and whether there are problems such as thread wear, deformation, or blockage.

[0057] After the test 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 testing components to rise smoothly, so that the testing head 7 exits from the threaded hole.

[0058] After the inspection is completed, the control system generates a detailed inspection report based on the collected torque data, including information such as the quality condition of the threaded hole, the specific location and type of defects, and promptly provides feedback to the operator via a display or alarm device. If the threaded hole is in good condition, the device can automatically record the qualified information; if a non-conformity is detected, the device can trigger the corresponding processing mechanism according to the preset program, such as stopping the production line or marking the non-conforming product.

[0059] like Figure 1-5 As shown, the device includes a vertical mounting frame 10 with a vertical guide rail 11 on it. The lifting bracket 3 has 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 lifting. The vertical mounting frame 10 has an upper limit section and a lower limit section that respectively limit the vertical displacement of the vertical mounting frame 10. The upper and lower limit sections can be in the form of mechanical stops, photoelectric sensors, or magnetic induction switches, ensuring that the lifting bracket 3 moves within the set stroke range and preventing excessive lifting and lowering that could damage the equipment.

[0060] like Figure 1-5 As shown, the lifting cylinder 1 and the balancing cylinder 2 are mounted on the horizontal mounting base 15, which is fixed on the vertical mounting frame 10. The horizontal mounting base 15 is made of thick steel plate or cast iron, and has sufficient strength and rigidity to stably support the cylinders and withstand various loads during operation.

[0061] like Figure 1-6As shown, the lifting bracket 3 includes a vertical plate 31 and a horizontal plate 32. The horizontal plate 32 has a stepped recess 20, and a mounting through hole 21 is provided in the middle of the stepped recess 20. The housing of the detection motor 4 is fixed to the horizontal plate 32. A protrusion 17 is provided on the lower part of the housing, and the protrusion 17 fits into the stepped recess 20. The outer periphery of the upper section of the bushing 5 is provided with a convex ring 18, and an annular convex edge 19 is provided on the upper side of the convex ring 18. The annular convex edge 19 is inserted into the mounting through hole 21. The convex ring 18 abuts against the lower surface of the horizontal plate 32, and the convex ring 18 is fixed to the stepped recess 20. This fitting design can ensure that the detection motor 4 and the bushing 5 are stably fixed during operation, reduce vibration and displacement, improve detection accuracy, and facilitate disassembly and replacement.

[0062] like Figure 5-6 As shown, a bearing 23 is provided outside the output shaft 41 of the detection motor 4. The bearing 23 is a high-precision deep groove ball bearing 23 or angular contact ball bearing 23, which can withstand radial and axial loads, ensure the rotational accuracy of the output shaft 41 of the detection motor 4, and extend the service life of the detection motor 4.

[0063] 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 self-balancing piston 202, and a third piston rod 203 extending downward from the self-balancing piston 202.

[0064] This invention introduces a thread inspection device and method based on torque and go gauge measurement. Specific examples are used to illustrate the principle and implementation of this invention. The descriptions of the embodiments are merely for the purpose of helping to understand this invention and its core ideas. It should be noted that those skilled in the art can make various improvements and modifications to this invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this invention.

Claims

1. A thread inspection device based on torque and go gauge measurement, characterized in that: Includes lifting cylinder, balancing cylinder, lifting bracket and detection components; The detection assembly includes a detection motor, a bushing, a multi-section parallel line coupling, a detection head, and a detection rod. The detection motor is mounted on the lifting bracket, which is connected to the first piston rod extending downward from the lifting cylinder and the second piston rod extending downward from the balance cylinder. The bushing is fixed on the lifting bracket, the parallel line couplings are arranged side by side, the detection head is located below the parallel line couplings, and the parallel line couplings and the detection head are located in the middle hole of the bushing. The multiple parallel line couplings are connected by longitudinal connecting pins, with the mating surfaces of each parallel line coupling abutting each other. A first radial clearance exists between the parallel line coupling and the bushing; a second radial clearance exists between the detection head and the central hole of the bushing. The output shaft of the detection motor is inserted into the middle hole of the uppermost parallel line coupling, and the connecting shaft of the detection head is inserted into the middle hole of the lowermost parallel line coupling. The detection rod is fixed inside the central hole of the detection head, and the bushing is provided with a plurality of radially evenly distributed elastic bolts. The inner ends of the elastic bolts abut against the detection head so that the detection head is fixed inside the bushing. In the free state, the circle enclosed by the end faces of each elastic bolt is coaxial with the central hole of the bushing.

2. The thread inspection device based on torque and go gauge measurement according to claim 1, characterized in that: It includes a vertical mounting bracket, on which a vertical guide rail is provided, and a lifting bracket is provided with a slider that matches the vertical guide rail.

3. The thread inspection device based on torque and go gauge measurement according to claim 2, characterized in that: The lifting cylinder and the balancing cylinder are mounted on a horizontal mounting base fixed to the vertical mounting frame.

4. The thread inspection 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 self-balancing piston, and a third piston rod extending downward from the self-balancing piston.

5. A thread inspection 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 part and a lower limit part that respectively limit the vertical displacement of the vertical mounting frame.

6. A thread inspection device based on torque and go gauge measurement according to claim 1, characterized in that: The lifting support includes a vertical plate and a horizontal plate. The horizontal plate has a stepped recessed portion, and the stepped recessed portion has a mounting through hole in the middle. The housing of the detection motor is fixed to the horizontal plate, and a protrusion is provided on the lower part of the housing, which fits into the stepped recess. The upper part of the bushing is provided with a convex ring on its outer periphery, and the upper side of the convex ring is provided with an annular convex edge. The annular convex edge is inserted into the mounting through hole, the convex ring abuts against the lower surface of the transverse plate, and the convex ring is fixed to the stepped recess.

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

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