Thread detection device

Abstract

The embodiment of the present application discloses a thread detection device, which includes a support mechanism, a control device, a displacement detection mechanism, a rotation drive device, a rotation mechanism, a floating mechanism and a thread detection tool. The rotation mechanism is rotatably arranged on the support mechanism. The rotation drive device is transmission-connected to the rotation mechanism. The rotation drive device is connected to the control device. In addition, the rotation mechanism includes an axial floating inner shaft. The floating mechanism is detachably arranged on the axial floating inner shaft. The thread detection tool is connected to the floating mechanism. The displacement detection mechanism is arranged on the support mechanism and connected to the control device. The thread detection device of the embodiment of the present application can greatly improve the accuracy and reliability of thread parameter detection and ensure the detection quality by using the initial screwing point position of the workpiece to be detected and the thread detection tool as the starting position for detecting thread parameters; and can be applicable to the detection of different types of threads (standard parts and non-standard parts).

Description

Technical Field

[0001] The present application relates to the technical field related to thread detection, and specifically to a thread detection device. Background Art

[0002] Existing bolts all have a chamfer at their ends, and the thread at the chamfer is not a complete thread. Existing thread detection equipment does not take this problem into consideration, resulting in a large deviation between the detected thread parameters and the actual thread parameters, resulting in poor accuracy and reliability of the thread detection results. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present application provides a thread detection device.

[0004] The thread detection device includes a support mechanism, a control device, a displacement detection mechanism, a rotation drive device, a rotation mechanism, a floating mechanism and a thread detection tool. The rotation mechanism is rotatably arranged on the support mechanism. The rotation drive device is transmission-connected to the rotation mechanism. The rotation drive device is connected to the control device. In addition, the rotation mechanism includes an axial floating inner shaft. The floating mechanism is detachably arranged on the axial floating inner shaft. The thread detection tool is connected to the floating mechanism. The displacement detection mechanism is arranged on the support mechanism and connected to the control device.

[0005] According to a preferred embodiment of the present application, the thread detection device further comprises a lifting device, the lifting device is connected to the control device, and the support mechanism is arranged on the lifting device.

[0006] According to a preferred embodiment of the present application, the rotating mechanism includes the axially floating inner shaft, the hollow outer shaft, the spring retaining ring, the first spring and the second spring. The hollow outer shaft is rotatably mounted on the supporting mechanism through the first bearing and the second bearing. The hollow outer shaft is sleeved outside the axially floating inner shaft in a manner that it can move relative to the axial direction. The axially floating inner shaft, the hollow outer shaft and the spring retaining ring are connected by a first transmission mechanism, so that the hollow outer shaft can drive the axially floating inner shaft to rotate. The first spring is arranged between the first bearing and the spring retaining ring, and the second spring is arranged between the second bearing and the spring retaining ring.

[0007] According to a preferred embodiment of the present application, one end of the hollow outer shaft abuts against the inner ring end face of the first bearing through a limiting boss. The other end of the hollow outer shaft is connected to the support mechanism through the third bearing, and a locking nut is provided on the hollow outer shaft to abut against the inner ring end face of the third bearing.

[0008] According to a preferred embodiment of the present application, the first transmission mechanism includes a plurality of first pin holes axially arranged on the axially floating inner shaft, a strip hole axially arranged on the hollow outer shaft, two second pin holes symmetrically arranged on the spring retaining ring, and a connecting pin. The connecting pin is inserted into the strip hole, the first pin hole, and the second pin hole, so that the hollow outer shaft can drive the axially floating inner shaft to rotate. In addition, a first locking screw is arranged in each of the two second pin holes.

[0009] According to a preferred embodiment of the present application, the displacement detection mechanism includes a displacement sensor, a slide rail, a slider and a fourth bearing. The displacement sensor and the slide rail are fixed on the support mechanism. The slider is slidably arranged on the slide rail, and the slider is connected to the displacement rod on the displacement sensor. The inner ring of the fourth bearing is fixed on the axial floating inner shaft. And the outer ring of the fourth bearing is fixed on the slider.

[0010] According to a preferred embodiment of the present application, a U-shaped block is arranged on the sliding block, a second locking screw is arranged on the U-shaped block, and the outer ring of the fourth bearing is locked on the U-shaped block by the second locking screw.

[0011] According to a preferred embodiment of the present application, a locking piece is also provided on the displacement rod.

[0012] According to a preferred embodiment of the present application, the floating mechanism is detachably arranged on the axially floating inner shaft through a quick-change mechanism.

[0013] According to a preferred embodiment of the present application, the rotation drive device and the rotation mechanism are connected via a belt transmission mechanism, a chain transmission mechanism or a gear transmission mechanism.

[0014] According to a preferred embodiment of the present application, the thread detection tool is a go gauge or a no-go gauge.

[0015] Compared with the prior art, the thread detection device of the embodiment of the present application has the following beneficial effects:

[0016] The thread detection device of the embodiment of the present application can greatly improve the accuracy and reliability of thread parameter detection and ensure the detection quality by using the initial screwing point position of the workpiece to be detected and the thread detection tool as the starting position for detecting the thread parameters; and can be applied to the detection of different types of threads (standard parts and non-standard parts).

[0017] Some additional features of the present application may be explained in the following description. Some additional features of the present application will be apparent to those skilled in the art by inspection of the following description and corresponding drawings or understanding of the production or operation of the embodiments. The features disclosed in the present application may be realized and achieved by practice or use of various methods, means and combinations of the specific embodiments described below. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The exemplary embodiments of the present application and their descriptions are used to explain the present application and do not constitute a limitation of the present application. In each figure, the same reference numeral represents the same component.

[0019] Figure 1 , Figure 2 is a structural schematic diagram of a thread detection device according to some embodiments of the present application;

[0020] Figures 3 to 5 It is a schematic diagram of a partially enlarged structure of a thread detection device shown in some embodiments of the present application. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0022] It should be noted that if the description and claims of the present application and the above-mentioned drawings relate to the terms "first", "second", etc., they are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, if the terms "including" and "having" and any of their variations are involved, it is intended to cover non-exclusive inclusions, for example, the process, method, system, product or equipment that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0023] In this application, if the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc. are involved, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0024] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0025] In addition, in this application, the terms "installed", "set", "provided with", "connected", "connected", "socketed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0026] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0027] An embodiment of the present application discloses a thread detection device.

[0028] like Figure 1 , Figure 2 As shown, the thread detection device may include a supporting mechanism 100 , a control device, a displacement detection mechanism 200 , a rotation driving device 300 , a rotation mechanism 400 , a floating mechanism 500 and a thread detection tool 600 .

[0029] The rotating mechanism 400 is rotatably disposed on the supporting mechanism 100 .

[0030] Exemplarily, the rotating mechanism 400 may include an axially floating inner shaft 410 , a hollow outer shaft 420 , a spring retaining ring 430 , a first spring 441 , and a second spring 442 .

[0031] like Figure 3 , Figure 4As shown, the hollow outer shaft 420 is rotatably mounted on the support mechanism 100 through a first bearing 451 and a second bearing 452. The hollow outer shaft 420 is sleeved outside the axially floating inner shaft 410 in a manner that it can move relative to the axial direction. The axially floating inner shaft 410, the hollow outer shaft 420 and the spring retaining ring 430 are connected through a first transmission mechanism, so that the hollow outer shaft 420 can drive the axially floating inner shaft 410 to rotate.

[0032] Exemplarily, the first transmission mechanism includes a plurality of first pin holes 472 axially arranged on the axially floating inner shaft 410, a bar hole 471 axially arranged on the hollow outer shaft 420, two second pin holes 473 symmetrically arranged on the spring retaining ring 430, and a connecting pin 474. The connecting pin 474 is inserted into the bar hole 471, the first pin hole 472, and the second pin hole 473, so that the hollow outer shaft 420 can drive the axially floating inner shaft 410 to rotate. Further, as Figure 5 As shown, first locking screws 475 are provided in the two second pin holes 473 to prevent the connecting pin 474 from being disengaged during the rotation process.

[0033] Among them, the first spring 441 is arranged between the first bearing 451 and the spring retaining ring 430, and the second spring 442 is arranged between the second bearing 452 and the spring retaining ring 430. The first spring 441 and the second spring 442 can be used to balance the axial floating inner shaft 410, so that the axial floating inner shaft 410 can eliminate its own gravity or left-right asymmetric force at any time. For example, when the axial floating inner shaft 410 is installed in a vertical direction, its gravity can be eliminated; when the installation direction is in a horizontal direction, other friction forces can be eliminated; so that the mechanism is at a balance point. The purpose of the balance point is to minimize the friction between the detection tool and the workpiece being detected during the screwing process. That is, tool wear can be reduced.

[0034] Furthermore, in order to lock the hollow outer shaft 420 and prevent it from axial movement, one end of the hollow outer shaft 420 abuts against the inner ring end face of the first bearing 451 through a limiting boss 461; the other end of the hollow outer shaft 420 is connected to the support mechanism 100 through a third bearing 453, and a locking nut 462 is provided on the hollow outer shaft 420, abutting against the inner ring end face of the third bearing 453.

[0035] Among them, Figure 1 , Figure 3As shown, the rotation drive device 300 is installed on the support mechanism 100, and the rotation drive device 300 is connected to the control device (not shown in the figure). The rotation drive device 300 is transmission-connected with the rotating mechanism 400. Exemplarily, the rotation drive device 300 and the rotating mechanism 400 can be transmission-connected through a belt transmission mechanism, a chain transmission mechanism or a gear transmission mechanism. In this embodiment, the rotation drive device 300 can be a motor. The control device can be a single-chip microcomputer, a microcontroller, an industrial computer or a computer.

[0036] The displacement detection mechanism 200 is disposed on the support mechanism 100 and connected to the control device.

[0037] For example, Figures 1 to 5 As shown, the displacement detection mechanism 200 may include a displacement sensor 210 , a slide rail 220 , a slider 230 and a fourth bearing 240 .

[0038] Among them, the displacement sensor 210 and the slide rail 220 are fixed on the support mechanism 100. The displacement sensor 210 is connected to the control device. The slider 230 is slidably arranged on the slide rail 220, and the slider 230 is connected to the displacement rod 211 on the displacement sensor. The inner ring of the fourth bearing 240 is fixed on the axial floating inner shaft 410. And the outer ring of the fourth bearing 240 is fixed on the slider 230. Exemplarily, a U-shaped block is arranged on the slider 230. A second locking screw 250 is arranged on the U-shaped block. The outer ring of the fourth bearing 240 is locked on the U-shaped block by the second locking screw 250. When the axial floating inner shaft 410 is axially floating, the rotation and displacement of the axial floating inner shaft 410 can be transmitted to the slider 230, and the displacement rod on the displacement sensor is connected to the slider 230, so that the real displacement data can be obtained. The slider 230 and the fourth bearing 240 are tightly fixed by the second locking screw, so that the axial displacement error caused by the rotational motion can be eliminated, thereby improving the detection accuracy.

[0039] Furthermore, a locking member 260 is also provided on the displacement rod 211. In this embodiment, the locking member 260 can be a locking nut or a locking screw.

[0040] The floating mechanism 500 is detachably disposed on the axial floating inner shaft 410. Exemplarily, the floating mechanism 500 is detachably disposed on the axial floating inner shaft 410 through a quick-change mechanism. The floating mechanism 500 and the quick-change mechanism can both adopt existing floating mechanisms and quick-change mechanisms, such as existing floating mechanisms for thread through-stop detection.

[0041] The thread detection tool 600 is connected to the floating mechanism 500. Exemplarily, the thread detection tool 600 is a go gauge or a stop gauge.

[0042] Furthermore, the thread detection device also includes a lifting device. The lifting device is connected to the control device. The support mechanism 100 is arranged on the lifting device, so that the lifting device can drive the support mechanism 100 to move axially.

[0043] The working principle of the thread detection device in the embodiment of the present application is as follows:

[0044] After debugging, under the control of the control device, the lifting device drives the supporting mechanism 100 to move downward, so that the thread detection tool contacts the workpiece to be detected, and the first tooth of the thread detection tool contacts the chamfered surface of the workpiece to be detected; then the displacement detection mechanism starts to collect the displacement data of the axial floating inner shaft (that is, the displacement data of the thread detection tool); then the rotation drive device drives the axial floating inner shaft and the thread detection tool to rotate at least one circle, and through the comparison calculation of the control device, the maximum value or minimum value can be found. The position where the maximum value or minimum value is located is the tooth entry point position (that is, the initial screwing point position of the workpiece to be detected and the thread detection tool).

[0045] Specifically, the working process of the thread detection device in the embodiment of the present application is as follows:

[0046] S10: Obtain the initial engagement point position of the workpiece to be detected and the thread detection tool, and use the initial engagement point position as the starting position for detecting thread parameters. The initial engagement point position of the workpiece to be detected and the thread detection tool is the critical point position for engagement (snap-on) and separation between the workpiece to be detected and the thread detection tool. At this critical point position, if the thread detection tool rotates forward, the threads of the workpiece to be detected and the thread detection tool will further engage (snap-on), and if the thread detection tool rotates reversely, the threads of the thread detection tool will be separated from the threads of the workpiece to be detected.

[0047] Exemplarily, in this embodiment, the method for obtaining the initial screwing point position of the workpiece to be inspected and the thread inspection tool includes the following steps:

[0048] S110: The control device controls the lifting device to move the supporting mechanism downward, and the supporting mechanism drives the axial floating inner shaft and the thread detection tool thereon to move downward, so that the first thread teeth of the thread detection tool contact the chamfered surface of the workpiece to be detected.

[0049] S120: The control device controls the rotation drive device to drive the axial floating inner shaft in the rotation mechanism and the thread detection tool thereon to rotate, and rotate the thread detection tool N times in the opposite direction of the thread rotation direction of the workpiece to be detected, where 1<N<2.

[0050] S130: During the reverse rotation of the thread detection tool, the displacement detection mechanism collects position data of the thread detection tool in real time. For example, one circle of the workpiece to be detected can be subdivided into 360 parts, and during the reverse rotation of the thread detection tool, position data of the thread detection tool is collected for each part.

[0051] S140: The control device obtains the maximum value or minimum value in the position data of the thread detection tool collected in step S130. Exemplarily, the control device may use a comparison method to obtain the maximum value or minimum value in the position data of the thread detection tool collected.

[0052] The position indicated by the maximum value or the minimum value is the initial screwing point position of the workpiece to be inspected and the thread inspection tool.

[0053] S30: Under the control of the control device, the workpiece to be inspected is inspected to obtain thread parameters of the workpiece to be inspected.

[0054] Furthermore, the thread detection method also includes the following steps:

[0055] S40: The control device compares the thread parameters of the workpiece to be detected obtained in step S30 with the standard parameters to determine whether the thread parameters of the workpiece to be detected meet the standards. For example, if the thread parameters of the workpiece to be detected are compared with the standard parameters and the thread parameters of the workpiece to be detected are within the error range, then the workpiece to be detected meets the standards and is a qualified workpiece.

[0056] Furthermore, after step S10 and before step S30, the following steps are also included:

[0057] S20: thread entry judgment, judging whether the first thread of the thread detection tool can be screwed together with the first thread of the workpiece to be detected. That is, whether the first thread of the thread detection tool can be screwed together with the first thread of the workpiece to be detected (whether the first thread of the thread detection tool can successfully enter the first thread of the workpiece to be detected).

[0058] If the first thread of the thread detection tool can be screwed into the first thread of the workpiece to be detected, that is, the first thread of the thread detection tool can successfully enter the first thread of the workpiece to be detected, step S30 is performed.

[0059] If the first thread of the thread detection tool cannot be screwed into the first thread of the workpiece to be detected, that is, the first thread of the thread detection tool cannot successfully enter the first thread of the workpiece to be detected, then step S20 can be repeated one to three times. Alternatively, the detection of the workpiece to be detected can be directly abandoned, and the next workpiece to be detected can be detected.

[0060] In some embodiments, the thread detection tool may employ a thread detection go gauge.

[0061] When a through gauge is used as a thread detection head, a method for determining whether the first thread of the thread detection tool can be screwed with the first thread of the workpiece to be detected may include the following steps:

[0062] S210: The thread detection tool is rotated under the driving of the rotation drive device, and the displacement detection mechanism obtains the displacement of the thread detection tool after the rotation.

[0063] S220: The control device determines whether the displacement reaches a preset value.

[0064] If so, the first thread of the thread detection tool can be screwed into the first thread of the workpiece to be detected, that is, the first thread thread (first thread) of the thread detection tool can successfully enter the first thread thread (first thread) of the workpiece to be detected.

[0065] The method for obtaining the displacement of the thread detection tool after rotation may include the following steps:

[0066] S211: Acquire the initial screwing point position of the workpiece to be inspected and the thread inspection tool through a displacement detection mechanism.

[0067] S212: Rotate the thread detection tool, and obtain the end point position of the thread detection tool after rotation through the displacement detection mechanism.

[0068] S213: The control device calculates the displacement according to the initial screwing point and the end point position.

[0069] Alternatively, the method for determining whether the first thread of the thread detection tool can be screwed with the first thread of the workpiece to be detected may include the following steps:

[0070] S230, setting the moving distance of the thread detection tool for thread entry judgment through the control device.

[0071] S240: Rotate the thread detection tool, and obtain the actual movement distance of the thread detection tool after rotation through the displacement detection mechanism.

[0072] S250: The control device compares the actual moving distance with the set moving distance. If the actual moving distance is greater than or equal to the set moving distance, the first thread of the thread detection tool can be screwed into the first thread of the workpiece to be detected, and the first thread tooth (first thread) of the thread detection tool can enter the first thread tooth (first thread) of the workpiece to be detected.

[0073] In some embodiments, the thread detection tool may employ a no-go gauge for thread detection.

[0074] When a stop gauge is used as a thread detection head, after step S10 and before step S30, the following step is also included: determining whether the thread detection tool can be effectively screwed and stopped with the workpiece to be detected.

[0075] If the thread detection tool can be effectively screwed and stopped with the workpiece to be detected, step S30 is performed.

[0076] The method for determining whether the thread detection tool can be effectively screwed and stopped with the workpiece to be detected may include the following steps:

[0077] S260: Rotate the thread detection tool, and obtain the angle and position of the first stop point of the thread detection tool through a displacement detection mechanism.

[0078] S270: After rotating the thread detection tool in the reverse direction, the thread detection tool is rotated forward again to obtain the angle and position of the second stop point of the thread detection tool through the displacement detection mechanism.

[0079] S280: The control device compares the angle and position of the first stop point with the angle and position of the second stop point. If they are within the error range, the thread detection tool can be effectively screwed and stopped with the workpiece to be detected.

[0080] For example, the angle of the first stop point and the angle of the second stop point can be compared to see whether they are within the error range; if so, continue to compare the position of the first stop point and the position of the second stop point to see whether they are within the error range; if so, the thread detection tool can be screwed with the workpiece to be detected.

[0081] Taking M20×1.5 bolts as an example, the thread detection method of the present application is compared with the existing thread detection method, and the results are shown in the following table:

[0082]

[0083] From the above comparison, it can be seen that the thread detection device of the embodiment of the present application can greatly improve the accuracy and reliability of thread parameter detection and ensure the detection quality by taking the initial screwing point position of the workpiece to be detected and the thread detection tool as the starting position for detecting the thread parameters; and can be suitable for the detection of different types of threads (standard parts and non-standard parts).

[0084] It should be noted that all features disclosed in this specification, or steps in all methods or processes disclosed, except for mutually exclusive features and / or steps, can be combined in any manner.

[0085] In addition, the above specific embodiments are exemplary, and those skilled in the art can come up with various solutions inspired by the disclosure of the present invention, and these solutions also belong to the disclosure scope of the present invention and fall within the protection scope of the present invention. Those skilled in the art should understand that the present invention description and its drawings are illustrative and do not constitute a limitation of the claims. The protection scope of the present invention is defined by the claims and their equivalents.

Claims

1. A thread detection device, characterized in that: The thread detection device comprises a support mechanism (100), a control device, a displacement detection mechanism (200), a rotation drive device (300), a rotation mechanism (400), a floating mechanism (500) and a thread detection tool (600); The rotating mechanism (400) is rotatably arranged on the supporting mechanism (100); the rotating driving device (300) is transmission-connected to the rotating mechanism (400); and the rotating driving device (300) is connected to the control device; Furthermore, the rotating mechanism (400) includes an axially floating inner shaft (410); The floating mechanism (500) is detachably arranged on the axially floating inner shaft (410); The thread detection tool (600) is connected to the floating mechanism (500); The displacement detection mechanism (200) is arranged on the support mechanism (100) and connected to the control device; The rotating mechanism (400) comprises the axially floating inner shaft (410), a hollow outer shaft (420), a spring retaining ring (430), a first spring (441) and a second spring (442); The hollow outer shaft (420) is rotatably mounted on the support mechanism (100) via a first bearing (451) and a second bearing (452); The hollow outer shaft (420) is sleeved outside the axially floating inner shaft (410) in a manner capable of relative movement in the axial direction; and the axially floating inner shaft (410), the hollow outer shaft (420) and the spring retaining ring (430) are connected via a first transmission mechanism, so that the hollow outer shaft (420) can drive the axially floating inner shaft (410) to rotate; The first spring (441) is arranged between the first bearing (451) and the spring retaining ring (430), and the second spring (442) is arranged between the second bearing (452) and the spring retaining ring (430).

2. The thread detection device according to claim 1, characterized in that: The thread detection device also includes a lifting device; The lifting device is connected to the control device; the supporting mechanism (100) is arranged on the lifting device.

3. The thread detection device according to claim 1, characterized in that: One end of the hollow outer shaft (420) abuts against the inner ring end surface of the first bearing (451) via a limiting boss (461); The other end of the hollow outer shaft (420) is connected to the support mechanism (100) via a third bearing (453), and a locking nut (462) is provided on the hollow outer shaft (420) to abut against the inner ring end surface of the third bearing (453).

4. The thread detection device according to claim 1, characterized in that: The first transmission mechanism comprises a plurality of first pin holes (472) axially arranged on the axially floating inner shaft (410), a strip hole (471) axially arranged on the hollow outer shaft (420), two second pin holes (473) symmetrically arranged on the spring retaining ring (430), and a connecting pin (474); The connecting pin (474) is inserted into the strip hole (471), the first pin hole (472) and the second pin hole (473), so that the hollow outer shaft (420) can drive the axial floating inner shaft (410) to rotate; Furthermore, a first locking screw (475) is provided in each of the two second pin holes (473).

5. The thread detection device according to claim 1, characterized in that: The displacement detection mechanism (200) comprises a displacement sensor (210), a slide rail (220), a slider (230) and a fourth bearing (240); The displacement sensor (210) and the slide rail (220) are fixed on the support mechanism (100); The slider (230) is slidably disposed on the slide rail (220), and the slider (230) is connected to a displacement rod (211) on the displacement sensor; The inner ring of the fourth bearing (240) is fixed on the axially floating inner shaft (410); and the outer ring of the fourth bearing (240) is fixed on the slider (230).

6. The thread detection device according to claim 5, characterized in that: A U-shaped block is arranged on the sliding block (230); a second locking screw (250) is arranged on the U-shaped block; The outer ring of the fourth bearing (240) is locked on the U-shaped block by the second locking screw (250).

7. The thread detection device according to claim 5, characterized in that: A locking piece (260) is also provided on the displacement rod (211).

8. The thread detection device according to claim 1, characterized in that: The floating mechanism (500) is detachably arranged on the axially floating inner shaft (410) via a quick-change mechanism.

9. The thread detection device according to claim 1, characterized in that: The rotation drive device (300) and the rotation mechanism (400) are connected in transmission via a belt transmission mechanism, a chain transmission mechanism or a gear transmission mechanism.

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