A coaxiality detection device

Abstract

The present invention relates to a coaxiality detection device, comprising a rod body, a tension and compression mechanism and a detection mechanism, wherein the rod body is in a hollow tubular shape, the tension and compression mechanism comprises a pull rod, a first force plate, a second force plate and a locking member, the first force plate is arranged at the first end of the rod body, the first end of the pull rod is connected to the first force plate, the second end of the pull rod passes through the rod body and the second force plate arranged at the second end of the rod body and is connected to the locking member, the locking member cooperates with the pull rod to clamp the first force plate and the second force plate from the two ends of the rod body, the detection mechanism comprises a mounting clamp arm and a lever micrometer, and the lever micrometer is mounted on the rod body through the mounting clamp arm. The tension and compression mechanism applies pressure to the two ends of the rod body, so that the tensile stress on the rod body is completely converted into compressive stress, because the compression strength is much higher than the tensile strength, under the action of a certain locking force, the bending amount of the rod body caused by its own weight will be greatly reduced, and the corresponding inspection accuracy can be improved in the inspection of coaxiality and the like.

Description

Technical Field

[0001] The invention relates to the technical field of measuring equipment, and in particular to a coaxiality detection device. Background Art

[0002] The inspection rod is a common tool in machine tool manufacturing and repair work. It is mainly used to check the radial runout, axial runout, coaxiality, parallelism of spindle sleeve parts and their parallelism with the guide rail.

[0003] Existing inspection rods rely on the rigidity of the material itself to ensure detection accuracy. That is, the higher the rigidity of the material of the inspection rod, the less likely the inspection rod is to deform and the higher its detection accuracy. However, there is no rigid body in reality. That is, when the inspection rod enters the hole to be tested at an angle that is not perpendicular to the horizontal plane, it will inevitably bend due to gravity. During the detection process, the bending will affect the measurement results. Summary of the invention

[0004] The object of the present invention is to provide a coaxiality detection device to avoid deformation caused by gravity when the device enters a hole to be measured at an angle not perpendicular to the horizontal plane, thereby improving detection accuracy.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A coaxiality detection device, comprising:

[0007] A test rod body, wherein the test rod body is in a hollow tube shape;

[0008] A tension and compression mechanism, the tension and compression mechanism comprises a tension rod, a first force plate, a second force plate and a locking member, the first force plate is arranged at the first end of the rod body, the first end of the tension rod is connected to the first force plate, the second end of the tension rod passes through the rod body and the second force plate arranged at the second end of the rod body and is connected to the locking member, the locking member cooperates with the tension rod to clamp the first force plate and the second force plate from both ends of the rod body;

[0009] The detection mechanism comprises a mounting clamp arm and a lever micrometer. The mounting clamp arm is adjustable in length. One end of the mounting clamp arm is detachably arranged on the inspection rod body, and the other end of the mounting clamp arm is detachably connected to the lever micrometer.

[0010] In one embodiment of the present application, the locking member is a locking nut, the second end of the pull rod is provided with an external thread, and the locking nut cooperates with the external thread.

[0011] In one embodiment of the present application, the locking member includes a locking cam rotatably disposed at the second end of the pull rod, and when the locking cam rotates to a preset angle, the first force plate and the second force plate are clamped from both ends of the test rod body.

[0012] In one embodiment of the present application, the locking pieces are respectively provided at both ends of the pull rod.

[0013] In one embodiment of the present application, the pull rod is a hollow rod, and the cross-section of the inner wall surface and / or the cross-section of the outer wall surface of the pull rod is a polygon.

[0014] In one embodiment of the present application, the cross-sectional shape of the inner wall surface of the sample body is a regular polygon, or the cross-sectional shape of the inner wall surface of the sample body is composed of a plurality of arc segments connected, and the arc segments are concave away from the axis of the sample body.

[0015] In one embodiment of the present application, a plurality of ribs are provided on the inner wall surface of the bar body. The ribs extend axially along the bar body. The ribs are evenly distributed circumferentially along the bar body. The side of the ribs away from the bar body forms an accommodating space for accommodating the pull rod.

[0016] In one embodiment of the present application, a reinforcing plate is connected between two adjacent ribs at a side away from the inner wall surface of the probe body.

[0017] In one embodiment of the present application, the first force-bearing plate and the bar body are matched with each other through a first concave-convex matching structure, and the second force-bearing plate and the bar body are matched with each other through a second concave-convex matching structure.

[0018] In one embodiment of the present application, the mounting clamp arm includes a plurality of rotatably connected arm bodies, the arm body at the first end of the mounting clamp arm is provided with a magnetic suction device for adsorbing on the inspection rod body, and the arm body at the second end of the mounting clamp arm is provided with a clamping claw for clamping the lever micrometer.

[0019] As can be seen from the above technical scheme, the present invention discloses a coaxiality detection device, which includes a test rod body, a tensioning and pressing mechanism and a detection mechanism, wherein the test rod body is a hollow tube, and the tensioning and pressing mechanism includes a pull rod, a first force plate, a second force plate and a locking piece, the first force plate is arranged at the first end of the test rod body, the first end of the pull rod is connected to the first force plate, the second end of the pull rod passes through the test rod body and the second force plate arranged at the second end of the test rod body and is connected to the locking piece, the locking piece cooperates with the pull rod to clamp the first force plate and the second force plate from the two ends of the test rod body, the first force plate and the pull rod can be an integrated structure, or the first force plate and the pull rod can be a separate structure, and the two can be connected by a threaded structure, that is, the center of the first force plate and the pull rod can be connected A screw hole is set at one of the two places at the first end, and a stud is set at the other place. The first end of the pull rod is connected to the first force plate through the screw hole and the stud, or through a threaded fastener. That is, a through hole can be set on the first force plate, and a screw hole is set axially at the first end of the pull rod, and the threaded fastener passes through the through hole and is connected to the screw hole. Of course, a locking piece can also be set at the first end of the pull rod, even if locking pieces are respectively set at both ends of the pull rod, the two locking pieces respectively apply force to the first force plate and the second force plate from both ends, so that the first force plate and the second force plate are clamped from both ends of the inspection rod body. The detection mechanism includes an installation clamp arm and a lever micrometer. The length of the installation clamp arm is adjustable. One end of the installation clamp arm is detachably arranged on the inspection rod body, and the other end of the installation clamp arm is detachably connected to the lever micrometer.

[0020] When in use, first assemble the coaxiality detection device, that is, set the first force plate at the first end of the inspection rod body, and connect the first end of the pull rod to the first force plate. After the second end of the pull rod passes through the inspection rod body and the second force plate in sequence along the axial direction, it is connected with the locking piece. Then, the lever micrometer of the detection mechanism is installed on the mounting clamp arm, and the mounting clamp arm is fixed to the inspection rod body. The length of the mounting clamp arm is adjusted, and the above-mentioned coaxiality detection device is extended into the part to be measured, so that the inspection rod body is coaxial with the part to be measured, and then the inspection rod body is rotated. If the reading of the lever micrometer does not change, or the range of change of the reading is within the preset range, it means that the coaxiality of the part to be measured meets the requirements, otherwise it does not meet the requirements.

[0021] It can be seen that due to the above-mentioned coaxiality detection device, the locking piece of the tension and compression mechanism is used to apply pressure to the second force-bearing plate, and at the same time, the pull rod is used to act on the first force-bearing plate, so that the first force-bearing plate and the second force-bearing plate simultaneously apply pressure to the inspection rod body from both ends of the inspection rod body, and the locking force of the locking piece is calculated and applied according to the dead weight of the inspection rod body. In this way, when the locking piece is locked, the tensile stress on the inspection rod body is completely converted into compressive stress. Because the compression strength is much higher than the tensile strength, under the action of a certain locking force, the bending amount of the inspection rod body caused by its own weight will be greatly reduced, and the corresponding inspection accuracy can be improved in coaxiality and other inspections. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A schematic diagram of the structure of a coaxiality detection device provided by an embodiment of the present invention;

[0024] Figure 2 A schematic longitudinal section diagram of a test rod body and a tension and compression mechanism of a coaxiality detection device provided by an embodiment of the present invention;

[0025] Figure 3 A schematic longitudinal section diagram of a test rod body and a tension and compression mechanism of a coaxiality detection device provided in another embodiment of the present invention;

[0026] Figure 4 A schematic cross-sectional view of a pull rod of a coaxiality detection device provided by an embodiment of the present invention;

[0027] Figure 5 A schematic cross-sectional view of a pull rod of a coaxiality detection device provided in another embodiment of the present invention;

[0028] Figure 6 A schematic cross-sectional view of a pull rod of a coaxiality detection device provided in yet another embodiment of the present invention;

[0029] Figure 7 A schematic cross-sectional view of a test rod body and a tension and compression mechanism of a coaxiality detection device provided in one embodiment of the present invention;

[0030] Figure 8 A schematic cross-sectional view of a test rod body and a tension and compression mechanism of a coaxiality detection device provided in another embodiment of the present invention;

[0031] Fig. 9 A cross-sectional schematic diagram of a coaxiality detection device provided in yet another embodiment of the present invention;

[0032] Fig.10 A schematic longitudinal section diagram of a test rod body, a first force-bearing plate and a second force-bearing plate of a coaxiality detection device provided in an embodiment of the present invention.

[0033] In the figure:

[0034] 1-test rod body; 2-pull rod; 3-first force plate; 4-second force plate; 5-external thread; 6-locking nut; 7-detection mechanism; 710-magnetic device; 720-installation clamp arm; 721-first arm body; 722-second arm body; 723-third arm body; 730-lever micrometer; 8-locking cam; 9-rib plate; 10-reinforcement plate; 11-first annular boss; 12-second annular boss. DETAILED DESCRIPTION

[0035] The core of the present invention is to provide a coaxiality detection device, the structural design of which can avoid deformation caused by gravity when entering the hole to be tested at an angle not perpendicular to the horizontal plane, thereby improving the detection accuracy.

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] See also Figure 1 , Figure 1 A schematic structural diagram of a coaxiality detection device provided in one embodiment of the present invention.

[0038] The embodiment of the present invention discloses a coaxiality detection device, which includes a test rod body 1, a tension and compression mechanism, and a detection mechanism 7.

[0039] The probe body 1 is in the shape of a hollow tube.

[0040] The pulling and pressing mechanism includes a pull rod 2, a first force-bearing plate 3, a second force-bearing plate 4 and a locking piece. The first force-bearing plate 3 is arranged at the first end of the test rod body 1, the first end of the pull rod 2 is connected to the first force-bearing plate 3, the second end of the pull rod 2 passes through the test rod body 1 and the second force-bearing plate 4 arranged at the second end of the test rod body 1 and is connected to the locking piece. The locking piece cooperates with the pull rod 2 to clamp the first force-bearing plate 3 and the second force-bearing plate 4 from both ends of the test rod body 1.

[0041] The first force plate 3 and the pull rod 2 can be an integral structure, or the first force plate 3 and the pull rod 2 can be a separate structure, and the two can be connected by a threaded structure, that is, a screw hole can be set at one of the two places, the center of the first force plate 3 and the first end of the pull rod 2, and a stud can be set at the other place, and the first end of the pull rod 2 and the first force plate 3 are connected by the screw hole and the stud, or are connected by a threaded fastener, that is, a through hole can be set on the first force plate 3, and a screw hole can be set axially at the first end of the pull rod 2, and the threaded fastener passes through the through hole and is connected by the screw hole. Of course, a locking piece can also be set at the first end of the pull rod 2, even if locking pieces are respectively set at both ends of the pull rod 2, the two locking pieces respectively apply force to the first force plate 3 and the second force plate 4 from both ends, so that the first force plate 3 and the second force plate 4 are clamped from both ends of the test rod body 1. It should be noted that the outer diameters of the first force plate 3 and the second force plate 4 are less than or equal to the outer diameter of the test rod body 1.

[0042] The detection mechanism 7 includes a mounting clamp arm 720 and a lever micrometer 730 . The mounting clamp arm 720 is adjustable in length. One end of the mounting clamp arm 720 is detachably disposed on the inspection rod body 1 , and the other end of the mounting clamp arm 720 is detachably connected to the lever micrometer 730 .

[0043] Compared with the prior art, when the coaxiality detection device provided in the embodiment of the present invention is used, the coaxiality detection device is first assembled, that is, the first force plate 3 is set at the first end of the test rod body 1, and the first end of the pull rod 2 is connected to the first force plate 3. After the second end of the pull rod 2 passes through the test rod body 1 and the second force plate 4 in sequence along the axial direction, it is connected with the locking piece. Then, the lever micrometer 730 of the detection mechanism 7 is installed on the mounting clamp arm 720, and the mounting clamp arm 720 is fixed to the test rod body 1. The length of the mounting clamp arm 720 is adjusted, and the above-mentioned coaxiality detection device is extended into the part to be measured, so that the test rod body 1 is coaxial with the part to be measured, and then the test rod body 1 is rotated. If the reading of the lever micrometer 730 remains unchanged, or the range of change of the reading is within the preset range, it means that the coaxiality of the part to be measured meets the requirements, otherwise it does not meet the requirements.

[0044] It can be seen that due to the above-mentioned coaxiality detection device, the locking piece of the tension and compression mechanism is used to apply pressure to the second force-bearing plate 4, and at the same time acts on the first force-bearing plate 3 through the pull rod 2, so that the first force-bearing plate 3 and the second force-bearing plate 4 simultaneously apply pressure to the test rod body 1 from both ends of the test rod body 1, and the locking force of the locking piece is calculated and applied according to the dead weight of the test rod body 1. In this way, when the locking piece is locked, the tensile stress on the test rod body 1 is completely converted into compressive stress. Because the compression strength is much higher than the tensile strength, under the action of a certain locking force, the bending amount of the test rod body 1 caused by its own weight will be greatly reduced, and the corresponding inspection accuracy can be improved in coaxiality and other inspections.

[0045] like Figure 1 and Figure 2As shown, in one embodiment of the present invention, the locking piece is a locking nut 6, and the second end of the pull rod 2 is provided with an external thread 5, and the locking nut 6 cooperates with the external thread 5. During the process of cooperating with the external thread 5, the locking nut 6 moves along the axial direction of the pull rod 2, thereby pressing the second force plate 4 onto the end face of the inspection rod body 1. This locking piece has a simple structure, is easy to process, has low cost, and the locking nut 6 is easy to obtain.

[0046] Of course, the locking member is not limited to the above structure. Figure 3 As shown, in another embodiment of the present invention, the locking member includes a locking cam 8 rotatably arranged at the second end of the pull rod 2. When the locking cam 8 is rotated to a preset angle, the first force plate 3 and the second force plate 4 are clamped from both ends of the inspection rod body 1. When the locking cam 8 is rotated to a first angle relative to the pull rod 2, the contact position of the locking cam 8 and the second force plate 4 is shorter than the rotation axis of the locking cam 8, and the locking cam 8 cannot press the second force plate 4 to the end of the inspection rod body 1. When the locking cam 8 is rotated to a second angle relative to the pull rod 2, the contact position of the locking cam 8 and the second force plate 4 is longer than the rotation axis of the locking cam 8. At this time, the locking cam 8 can press the second force plate 4 to the end of the inspection rod body 1.

[0047] Of course Figure 2 and Figure 3 In the illustrated embodiment, a locking member is provided at only one end of the pull rod 2 . In other embodiments, locking members may be provided at both ends of the pull rod 2 .

[0048] In order to reduce the weight of the coaxiality detection device and ensure the strength against deformation, in an embodiment of the present invention, Figure 4 As shown, the tie rod 2 is a hollow rod, or at least partially a hollow rod.

[0049] To further optimize the above technical solution, in order to improve the bending strength of the pull rod 2, in an embodiment of the present invention, Figure 5 As shown, the cross section of the inner wall of the pull rod 2 is polygonal, and / or, as shown in Figure 6 As shown, the cross-section of the outer wall of the tie rod 2 is a polygon, and the above polygon includes a triangle, a quadrilateral, a pentagon, etc., which is not limited here. By making the cross-section of the inner wall and / or the outer wall of the tie rod 2 polygonal, the bending strength of the tie rod 2 can be improved.

[0050] like Figure 7 As shown, in the embodiment of the present invention, the cross-sectional shape of the inner wall surface of the sample body 1 is a regular polygon, or the cross-sectional shape of the inner wall surface of the sample body 1 is composed of a plurality of arc segments connected, and the arc segments are concave in the direction away from the axis of the sample body 1, thereby further improving the bending strength of the sample body 1.

[0051] like Figure 8As shown, in one embodiment of the present invention, a plurality of ribs 9 are provided on the inner wall surface of the specimen body 1, and the ribs 9 extend along the axial direction of the specimen body 1. The ribs 9 are evenly distributed along the circumference of the specimen body 1, that is, radially distributed along the radial direction of the specimen body 1. The side of each rib 9 away from the specimen body 1 forms an accommodating space for accommodating the pull rod 2. This arrangement can further improve the bending strength of the specimen body 1 through the ribs 9 and reduce its deformation.

[0052] Further optimize the above technical solution, such as Fig. 9 As shown, a reinforcing plate 10 is connected between two adjacent ribs 9 at one side away from the inner wall surface of the probe body 1, so as to improve the strength of the ribs 9 and prevent the ribs 9 from being deformed.

[0053] like Fig.10 As shown, the first force-bearing plate 3 and the rod body 1 are matched with each other through a first concave-convex matching structure, and the first concave-convex matching structure includes a first annular boss 11 provided on one of the first force-bearing plate 3 and the rod body 1, and a first annular groove provided on the other of the first force-bearing plate 3 and the rod body 1. The first annular boss 11 cooperates with the first annular groove to limit the first force-bearing plate 3 and the rod body 1, so as to ensure that the relative position of the first force-bearing plate 3 and the rod body 1 is stable when they are matched and pressed. The second force-bearing plate 4 and the rod body 1 are matched with each other through a second concave-convex matching structure, and the second concave-convex matching structure includes a second annular boss 12 provided on one of the second force-bearing plate 4 and the rod body 1, and a second annular groove provided on the other of the second force-bearing plate 4 and the rod body 1. The second annular boss 12 cooperates with the second annular groove to limit the second force-bearing plate 4 and the rod body 1, so as to ensure that the relative position of the second force-bearing plate 4 and the rod body 1 is stable when they are matched and pressed.

[0054] The mounting clamp arm 720 can be adjusted in length in a variety of ways. In one embodiment of the present application, the mounting clamp arm 720 includes a plurality of rotatably connected arm bodies. The length of the mounting clamp arm 720 can be adjusted by relative rotation of the arm bodies. The lengths of the arm bodies can be the same, or the length of at least one arm body can be different from the lengths of the other arm bodies. Specifically, Figure 1In the illustrated embodiment, the mounting clamp arm 720 includes three arm bodies, namely a first arm body 721, a second arm body 722 and a third arm body 723. The first arm body 721, the second arm body 722 and the third arm body 723 are hinged in sequence. A magnetic attraction device 710 for adsorbing on the rod body is provided on the arm body at the first end of the mounting clamp arm 720. Of course, the rod body 1 should also be made of ferromagnetic material, or the rod body 1 is partially made of ferromagnetic material, or a mounting base made of ferromagnetic material is provided on the rod body 1. Of course, if the rod body 1 is made of ferromagnetic material as a whole or partially, the magnetic attraction device 710 should have a groove adapted to the shape of the rod body 1 to increase the contact area between the magnetic attraction device 710 and the rod body 1, thereby improving the stability of the mounting clamp arm 720. A clamping claw for clamping the lever micrometer 730 is provided on the arm body at the second end of the mounting clamp arm 720.

[0055] It is foreseeable that in actual applications, if the length of the part to be tested is long, it is very difficult to rely on the inspector to visually read the lever micrometer. Therefore, in one embodiment of the present application, the detection mechanism also includes an image acquisition device, the image acquisition device includes a photosensitive element, a camera, a lighting lamp, a signal sending module and a user terminal. The user terminal is provided with a signal receiving module that is communicatively connected to the signal sending module. The photosensitive element, the camera and the lighting lamp are respectively communicatively connected to the controller of the user terminal. The user terminal is provided with a display. The photosensitive element is used to detect the ambient illumination. If the ambient illumination is lower than the preset value, the controller controls the lighting lamp to turn on and turn on the camera. The camera faces the lever micrometer for recording the reading of the lever micrometer during the detection process. The video captured by the camera is transmitted to the user terminal and fed back to the user on the display of the user terminal. Of course, the user can also manually turn on the lighting lamp and camera through the user terminal.

[0056] To further optimize the above technical solution, in order to keep the coaxiality detection device stable during the detection process, in one embodiment of the present application, the coaxiality detection device also includes a detection base, the detection base includes a base body, a part clamping mechanism, a rod inspection clamping mechanism and a rod inspection driving device, wherein the part clamping mechanism and the rod inspection clamping mechanism are both arranged on the base body, the part clamping mechanism includes a plurality of first clamping claws arranged at intervals in the circumferential direction, the rod inspection clamping mechanism includes a plurality of second clamping claws arranged at intervals in the circumferential direction, and the part clamping mechanism is coaxially arranged with the rod inspection clamping mechanism, the rod inspection clamping mechanism is arranged on the base body through the rod inspection driving device, and the rod inspection driving device drives the rod inspection clamping mechanism to move axially.

[0057] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0058] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A coaxiality detection device, characterized in that: include: A test rod body (1), wherein the test rod body (1) is in the shape of a hollow tube; A tensioning and pressing mechanism, the tensioning and pressing mechanism comprising a tension rod (2), a first force-bearing plate (3), a second force-bearing plate (4) and a locking member, wherein the first force-bearing plate (3) is arranged at the first end of the rod body (1), the first end of the tension rod (2) is connected to the first force-bearing plate (3), the second end of the tension rod (2) passes through the rod body (1) and the second force-bearing plate (4) arranged at the second end of the rod body (1) and is connected to the locking member, and the locking member cooperates with the tension rod (2) to clamp the first force-bearing plate (3) and the second force-bearing plate (4) from both ends of the rod body (1); A detection mechanism (7), the detection mechanism (7) comprising a mounting clamp arm (720) and a lever micrometer (730), the mounting clamp arm (720) being adjustable in length, one end of the mounting clamp arm (720) being detachably disposed on the inspection rod body (1), and the other end of the mounting clamp arm (720) being detachably connected to the lever micrometer (730); An image acquisition device, the image acquisition device includes a photosensitive element, a camera, a lighting lamp, a signal sending module and a user terminal, the user terminal is provided with a signal receiving module which is communicatively connected to the signal sending module, the photosensitive element, the camera and the lighting lamp are respectively communicatively connected to a controller of the user terminal, the user terminal is provided with a display, the photosensitive element is used to detect the ambient illumination, if the ambient illumination is lower than a preset value, the controller controls the lighting lamp to turn on and turns on the camera, the camera faces the lever micrometer, and is used to record the reading of the lever micrometer during the detection process, the video recorded by the camera is transmitted to the user terminal, and is fed back to the user on the display of the user terminal; A detection base, the detection base includes a base body, a part clamping mechanism, a rod clamping mechanism and a rod clamping drive device, the part clamping mechanism and the rod clamping mechanism are both arranged on the base body, the part clamping mechanism includes a plurality of first clamping claws arranged at intervals in the circumferential direction, the rod clamping mechanism includes a plurality of second clamping claws arranged at intervals in the circumferential direction, and the part clamping mechanism is coaxially arranged with the rod clamping mechanism, the rod clamping mechanism is arranged on the base body through the rod clamping drive device, and the rod clamping drive device drives the rod clamping mechanism to move axially.

2. The coaxiality detection device according to claim 1, characterized in that: The locking member is a locking nut (6), the second end of the pull rod (2) is provided with an external thread (5), and the locking nut (6) cooperates with the external thread (5).

3. The coaxiality detection device according to claim 1, characterized in that: The locking member comprises a locking cam (8) rotatably arranged at the second end of the pull rod (2); when the locking cam (8) is rotated to a preset angle, the first force-bearing plate (3) and the second force-bearing plate (4) are clamped from both ends of the test rod body (1).

4. The coaxiality detection device according to any one of claims 1 to 3, characterized in that: The locking pieces are respectively provided at both ends of the pull rod (2).

5. The coaxiality detection device according to any one of claims 1 to 3, characterized in that: The pull rod (2) is a hollow rod, and the cross section of the inner wall surface and / or the cross section of the outer wall surface of the pull rod (2) is a polygon.

6. The coaxiality detection device according to any one of claims 1 to 3, characterized in that: The cross-sectional shape of the inner wall surface of the probe body (1) is a regular polygon, or the cross-sectional shape of the inner wall surface of the probe body (1) is formed by connecting a plurality of arc line segments, and the arc line segments are concave in a direction away from the axis of the probe body (1).

7. The coaxiality detection device according to any one of claims 1 to 3, characterized in that: The inner wall surface of the bar body (1) is provided with a plurality of ribs (9), the ribs (9) extending along the axial direction of the bar body (1), the ribs (9) being evenly distributed along the circumference of the bar body (1), and the side of the ribs (9) away from the bar body (1) enclosing an accommodation space for accommodating the pull rod (2).

8. The coaxiality detection device according to claim 7, characterized in that: A reinforcing plate (10) is connected between two adjacent rib plates (9) on the side away from the inner wall surface of the probe body (1).

9. The coaxiality detection device according to any one of claims 1 to 3, characterized in that: The first force-bearing plate (3) and the rod-testing body (1) are matched with each other via a first concave-convex matching structure, and the second force-bearing plate (4) and the rod-testing body (1) are matched with each other via a second concave-convex matching structure.

10. The coaxiality detection device according to any one of claims 1 to 3, characterized in that: The mounting clamp arm (720) comprises a plurality of rotatably connected arm bodies, the arm body at the first end of the mounting clamp arm (720) being provided with a magnetic attraction device (710) for adsorbing onto the test rod body (1), and the arm body at the second end of the mounting clamp arm (720) being provided with a clamping claw for clamping the lever micrometer (730).

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