Axle radial runout measuring mechanism and method

Abstract

The invention relates to an axle radial run-out measuring mechanism and method. The device comprises a first measuring device which comprises a measuring rod connected to a supporting seat in a sliding mode, a first measuring head installed at the end of the measuring rod and a first displacement detection assembly for detecting the displacement of the first measuring head, and a first driving device which is used for driving the measuring rod to move. A first elastic buffer assembly is arranged between the driving end of the first driving device and the measuring rod; the second measuring device comprises a measuring frame connected to the supporting seat in a sliding manner, a second measuring head mounted on the measuring frame and a second displacement detection assembly for detecting the displacement of the second measuring head; the second driving device is used for driving the measuring frame to move, and a second elastic buffering assembly is arranged between the driving end of the first driving device and the measuring frame. According to the invention, the influence of impact force on the axle during measurement is reduced, the measurement requirements of axles with different diameters are met, and the measurement precision is improved.

Description

Technical Field

[0001] The invention relates to the technical field of shaft part measurement, and in particular to an axle radial runout measurement mechanism and method. Background Art

[0002] Axle radial runout refers to the displacement change of the outer diameter of the axle in the radial direction during the rotation of the axle. Radial runout will cause vibration and noise when the vehicle is running, and even increase the wear of the axle and wheels. Therefore, accurate measurement of the radial runout of the axle is of great significance to ensure the safety and stability of vehicle operation.

[0003] The existing axle radial runout measurement method is mainly carried out by contacting the outer diameter of the axle with a contact probe. However, when the probe contacts the axle surface, the instantaneous action of the drive mechanism of the measuring device may generate an impact force, which will be transmitted to the axle surface, causing deformation of the axle surface and measurement errors. Summary of the invention

[0004] To this end, the present invention provides an axle radial runout measurement mechanism and method, which reduce the impact of impact force on the axle during measurement, adapt to the measurement requirements of axles with different diameters, and improve measurement accuracy.

[0005] In order to solve the above technical problems, the present invention provides an axle radial runout measuring mechanism, which is arranged on one side of the axle to be measured during measurement, and the axle radial runout measuring mechanism includes a support seat, and the support seat is provided with:

[0006] The first measuring device comprises a measuring rod slidably connected to the support seat, a first measuring head mounted on the end of the measuring rod, and a first displacement detection assembly for detecting the displacement of the first measuring head;

[0007] A first driving device, used for driving the measuring rod to move, wherein a first elastic buffer component is arranged between a driving end of the first driving device and the measuring rod;

[0008] The second measuring device comprises a measuring frame slidably connected to the support seat, a second measuring head mounted on the measuring frame, and a second displacement detecting assembly for detecting the displacement of the second measuring head, wherein the measuring frame can be arranged across the radial sides of the axle to be measured, and the first measuring head and the second measuring head are arranged opposite to each other and can contact the radial ends of the axle to be measured;

[0009] The second driving device is used to drive the measuring frame to move, and a second elastic buffer component is arranged between the driving end of the first driving device and the measuring frame.

[0010] In one embodiment of the present invention, a first guide rail and a first slide table slidably connected to the first guide rail are provided on the support seat, and the measuring rod is installed on the first slide table.

[0011] In one embodiment of the present invention, the first displacement detection assembly includes a first grating ruler disposed on the first slide and a first reading head installed on the support seat and cooperating with the first grating ruler.

[0012] In one embodiment of the present invention, the first elastic buffer assembly includes a first movable frame, a first connecting seat, a first spring and a first spring guide column;

[0013] The first movable frame is installed on the first slide, and the first connecting seat is installed on the driving end of the first driving device;

[0014] A plurality of the first spring guide pillars pass through the first movable frame and are connected to the first connecting seat, and the first spring is sleeved on the first spring guide pillars;

[0015] Two ends of the first spring abut against the first movable frame and the first connecting seat respectively;

[0016] The first movable frame is limited by one end of the first spring guide column.

[0017] In one embodiment of the present invention, the first driving device includes a first servo electric cylinder installed on the support seat, and the first servo electric cylinder is slidably connected to a first electric cylinder slide connected to the telescopic rod of the first servo electric cylinder, and the first electric cylinder slide is connected to the first connecting seat.

[0018] In one embodiment of the present invention, a second guide rail and a second slide table slidably connected to the second guide rail are provided on the support seat, and the measuring frame is installed on the second slide table.

[0019] In one embodiment of the present invention, the second displacement detection assembly includes a second grating ruler disposed on the second slide and a second reading head installed on the support seat and cooperating with the second grating ruler.

[0020] In one embodiment of the present invention, the second elastic buffer assembly includes a second movable frame, a second connecting seat, a second spring and a second spring guide column;

[0021] The second movable frame is mounted on the second slide, and the second connecting seat is mounted on the driving end of the second driving device;

[0022] A plurality of the second spring guide posts pass through the second movable frame and are connected to the second connecting seat;

[0023] The second spring is sleeved on the second spring guide post;

[0024] The two ends of the second spring are respectively against one end of the second spring guide column and the second movable frame;

[0025] The second movable frame is limited by one end of the second spring guide column.

[0026] In one embodiment of the present invention, the second driving device includes a second servo electric cylinder installed on the support seat, and the second servo electric cylinder is slidably connected to a second electric cylinder slide connected to the telescopic rod of the second servo electric cylinder, and the second electric cylinder slide is connected to the second connecting seat.

[0027] The present invention also provides a method for measuring radial runout of an axle, using the axle radial runout measuring mechanism, the method comprising:

[0028] The first measuring head is driven to move by the first driving device until the first measuring head contacts one side of the outer diameter of the position to be measured of the axle to be measured;

[0029] The second measuring head is driven to move by the second driving device until the second measuring head contacts the other side of the outer diameter of the to-be-measured position of the to-be-measured axle;

[0030] After the first measuring head and the second measuring head contact the axle to be measured, locking the positions of the first driving device and the second driving device;

[0031] The axle to be tested is rotated, and the radial runout of the axle to be tested is obtained according to the displacement values ​​obtained by the first displacement detection component and the second displacement detection component.

[0032] The above technical solution of the present invention has the following advantages compared with the prior art:

[0033] The axle radial runout measuring mechanism and method described in the present invention, by setting a first elastic buffer component and a second elastic buffer component, are used to provide buffering when the probe contacts the axle surface. They can effectively absorb the instantaneous impact force generated during the measurement process and prevent these impact forces from being directly transmitted to the axle surface, thereby avoiding deformation of the axle surface and improving the stability and accuracy of the measurement.

[0034] The first measuring device and the second measuring device of the present invention can be adjusted by means of a slidingly connected measuring rod and a measuring frame. The measuring head can automatically adapt to axles of different diameters to ensure that the measuring head maintains an appropriate contact force with the outer diameter of the axle during the measurement process. The adaptive adjustment capability avoids measurement errors caused by changes in axle diameter, improves the versatility and scope of application of the device, and is suitable for radial runout measurement of axles of various specifications.

[0035] The measuring mechanism of the present invention has a compact structure and a reasonable design. Through the drive of the servo electric cylinder, accurate positioning of the measuring rod and the measuring frame and automatic adjustment of the measuring head are achieved. The operation is simple and convenient, and the efficiency of the axle radial runout measurement is improved.

[0036] The present invention can accurately detect the tiny displacement of the measuring head during the measurement process by arranging a displacement detection component composed of a grating ruler and a reading head. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings.

[0038] Figure 1 It is a schematic diagram of the overall structure of the axle radial runout measuring mechanism of the present invention from a side perspective.

[0039] Figure 2 It is a schematic diagram of the overall structure of the axle radial runout measuring mechanism of the present invention from another side perspective.

[0040] Figure 3 It is a side structural schematic diagram of the axle radial runout measuring mechanism of the present invention.

[0041] Figure 4 It is a schematic structural diagram of the first measuring device of the present invention.

[0042] Figure 5 It is a schematic structural diagram of the second measuring device of the present invention.

[0043] Figure 6 It is a schematic diagram of the exploded structure of the first elastic buffer component of the present invention.

[0044] Figure 7 It is a schematic diagram of the exploded structure of the second elastic buffer component of the present invention.

[0045] Figure 8 It is a schematic diagram of the protective shell structure of the axle radial runout measuring mechanism of the present invention.

[0046] Fig. 9 The figure is a schematic diagram of the arrangement structure of the axle radial runout measuring mechanism of the present invention during testing.

[0047] Description of the Figures in the Specification:

[0048] 100. Axle to be tested;

[0049] 1. Support seat; 11. First guide rail; 12. First slide; 13. Second guide rail; 14. Second slide; 15. Protective shell;

[0050] 2. first measuring device; 21. measuring rod; 22. first measuring head; 23. first displacement detection assembly; 231. first grating ruler; 232. first reading head;

[0051] 3. First driving device; 31. First servo electric cylinder; 32. First electric cylinder slide;

[0052] 4. first elastic buffer assembly; 41. first movable frame; 42. first connecting seat; 43. first spring; 44. first spring guide column;

[0053] 5. Second measuring device; 51. Measuring frame; 52. Second measuring head; 53. Second displacement detection assembly; 531. Second grating ruler; 532. Second reading head;

[0054] 6. Second driving device; 61. Second servo electric cylinder; 62. Second electric cylinder slide;

[0055] 7. Second elastic buffer assembly; 71. Second movable frame; 72. Second connecting seat; 73. Second spring; 74. Second spring guide column; DETAILED DESCRIPTION

[0056] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0057] In the present invention, if directions (up, down, left, right, front and back) are described, it is only for the convenience of describing the technical solution of the present invention, and does not indicate or imply that the technical features referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as a limitation of the present invention.

[0058] In the present invention, "several" means one or more, "multiple" means more than two, "greater than", "less than", "exceed" and the like are understood to exclude the number itself; "above", "below", "within" and the like are understood to include the number itself. In the description of the present invention, if there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0059] In the present invention, unless otherwise clearly defined, the words "set", "install", "connect" and the like should be understood in a broad sense, for example, they can be directly connected or indirectly connected through an intermediate medium; they can be fixedly connected or detachably connected or integrally formed; they can be mechanically connected or electrically connected or able to communicate with each other; they can be the internal connection of two elements or the interaction relationship between two elements. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0060] Reference Figure 1 As shown, an axle radial runout measuring mechanism according to an embodiment of the present invention is arranged on one side of the axle 100 to be measured during measurement, and the axle radial runout measuring mechanism comprises a support seat 1, on which the following are arranged:

[0061] The first measuring device 2 comprises a measuring rod 21 slidably connected to the support seat 1, a first measuring head 22 mounted on the end of the measuring rod 21, and a first displacement detecting assembly 23 for detecting the displacement of the first measuring head 22;

[0062] A first driving device 3, used for driving the measuring rod 21 to move, wherein a first elastic buffer component 4 is provided between a driving end of the first driving device 3 and the measuring rod 21;

[0063] The second measuring device 5 comprises a measuring frame 51 slidably connected to the support seat 1, a second measuring head 52 mounted on the measuring frame 51, and a second displacement detecting assembly 53 for detecting the displacement of the second measuring head 52. The measuring frame 51 can be arranged across the radial sides of the axle 100 to be measured, and the first measuring head 22 and the second measuring head 52 are arranged opposite to each other and can contact the radial ends of the axle 100 to be measured;

[0064] The second driving device 6 is used to drive the measuring frame 51 to move. A second elastic buffer component 7 is arranged between the driving end of the first driving device 3 and the measuring frame 51 .

[0065] In one embodiment, a first guide rail 11 and a first slide table 12 slidably connected to the first guide rail 11 are provided on the support seat 1 , and the measuring rod 21 is installed on the first slide table 12 .

[0066] Specifically, refer to Figure 1 As shown, the first displacement detection assembly 23 includes a first grating ruler 231 disposed on the first slide 12 and a first reading head 232 installed on the support seat 1 and cooperating with the first grating ruler 231 .

[0067] Reference Figure 6As shown, the first elastic buffer assembly 4 includes a first movable frame 41, a first connecting seat 42, a first spring 43 and a first spring guide column 44;

[0068] The first movable frame 41 is installed on the first slide 12, and the first connecting seat 42 is installed on the driving end of the first driving device 3;

[0069] A plurality of first spring guide pillars 44 pass through the first movable frame 41 and are connected to the first connecting seat 42 , and the first spring 43 is sleeved on the first spring guide pillars 44 ;

[0070] Two ends of the first spring 43 abut against the first movable frame 41 and the first connecting seat 42 respectively;

[0071] The first movable frame 41 is limited by one end of the first spring guide column 44 .

[0072] Reference Figure 4 As shown, the first driving device 3 includes a first servo electric cylinder 31 installed on the support seat 1, and the first servo electric cylinder 31 is slidably connected to a first electric cylinder slide 32 connected to the telescopic rod of the first servo electric cylinder 31, and the first electric cylinder slide 32 is connected to the first connecting seat 42.

[0073] It is understandable that when the first servo electric cylinder 31 pushes the first probe 22 to move toward the axle surface, the probe will contact the outer diameter surface of the axle, and the first spring 43 will be compressed. Since the first probe 22 is connected to the first movable frame 41 through the measuring rod 21, the displacement of the first probe 22 will cause the first movable frame 41 to be acted upon by force through the first spring 43.

[0074] The first spring 43 can provide a buffering force. When the first probe 22 contacts the axle, if an instantaneous impact force is generated, the impact force will be absorbed by the first spring 43 to prevent it from being directly transmitted to the axle surface.

[0075] In addition, during the measurement process, when the first probe 22 is displaced, the first movable frame 41 is displaced accordingly (the first spring 43 is always against the first movable frame 41 ), so as to be detected by the first measuring device 2 .

[0076] The elastic coefficient of the first spring 43 provides an appropriate reaction force according to actual measurement requirements, so that the contact force of the first probe 22 on the axle can be adaptively adjusted, thereby effectively preventing the axle from being deformed due to excessive force during the measurement process.

[0077] In one embodiment, a second guide rail 13 and a second slide table 14 slidably connected to the second guide rail 13 are disposed on the support seat 1 , and the measuring frame 51 is installed on the second slide table 14 .

[0078] Specifically, the second displacement detection assembly 53 includes a second grating ruler 531 disposed on the second slide 14 and a second reading head 532 installed on the support seat 1 and cooperating with the second grating ruler 531 .

[0079] Reference Figure 7 As shown, the second elastic buffer assembly 7 includes a second movable frame 71, a second connecting seat 72, a second spring 73 and a second spring guide column 74;

[0080] The second movable frame 71 is installed on the second slide 14, and the second connecting seat 72 is installed on the driving end of the second driving device 6;

[0081] A plurality of second spring guide pillars 74 pass through the second movable frame 71 and are connected to the second connecting seat 72;

[0082] The second spring 73 is sleeved on the second spring guide post 74;

[0083] The two ends of the second spring 73 are respectively against one end of the second spring guide column 74 and the second movable frame 71;

[0084] The second movable frame 71 is limited by one end of the second spring guide column 74 .

[0085] It is understandable that when the second servo electric cylinder 61 pulls the second probe 52 to move toward the axle surface, the second spring 73 will be compressed. Since the second probe 52 is connected to the first movable frame 41 through the measuring frame 51, the displacement of the second probe 52 will cause the second movable frame 71 to be acted upon by the second spring 73.

[0086] The second spring 73 can provide a buffering force. When the second probe 52 contacts the axle, if an instantaneous impact force is generated, the impact force will be absorbed by the second spring 73 to prevent it from being directly transmitted to the axle surface.

[0087] In addition, during the measurement process, when the second probe 52 is displaced, the second movable frame 71 is displaced accordingly (the second spring 73 is always against the second movable frame 71 ), so as to be detected by the second measuring device 5 .

[0088] The elastic coefficient of the second spring 73 provides an appropriate reaction force according to actual measurement requirements, so that the contact force of the second probe 52 on the axle can be adaptively adjusted, thereby effectively preventing the axle from being deformed due to excessive force during the measurement process.

[0089] Reference Figure 5As shown, the second driving device 6 includes a second servo electric cylinder 61 installed on the support seat 1, and the second servo electric cylinder 61 is slidably connected with a second electric cylinder slide 62 connected to the telescopic rod of the second servo electric cylinder 61, and the second electric cylinder slide 62 is connected to the second connecting seat 72.

[0090] In one embodiment, referring to Figure 3 As shown, the first guide rail 11 and the second guide rail 13 are both cross roller guide rails, and other guide rail structures can also be used. The first probe 22 and the second probe 52 are both made of alloy.

[0091] By providing the first elastic buffer component 4 and the second elastic buffer component 7, the deformation of the axle surface caused by the impact force generated during the driving process of the servo electric cylinder can be effectively reduced. By using the elastic coefficients of the first spring 43 and the second spring 73, the probe can adaptively adjust the force of pressing the axle. The mechanism has a flexible measurement capability and can automatically adjust the distance between the first probe 22 and the second probe 52 according to the diameter change of the axle 100 to be measured to adapt to axles of different diameters.

[0092] Reference Figure 8 As shown, in order to protect the internal components, a protective shell 15 is provided to cooperate with the support base 1. The protective shell 15 can cover various devices, leaving only the first probe 22, the measuring rod 21, the measuring frame 51 and the second probe 52 extending.

[0093] Reference Fig. 9 As shown, during measurement, the axle radial runout measuring mechanism can be set on the axle 100 to be tested by setting a corresponding linear module, and can move axially along the axle 100 to be tested to detect different outer diameter positions of the axle 100 to be tested.

[0094] This embodiment also provides a method for measuring radial runout of an axle, using the axle radial runout measuring mechanism, the method comprising:

[0095] S1, driving the first measuring head 22 to move by the first driving device 3 until the first measuring head 22 contacts one side of the outer diameter of the position to be measured of the axle 100 to be measured;

[0096] S2, driving the second measuring head 52 to move by the second driving device 6 until the second measuring head 52 contacts the other side of the outer diameter of the to-be-measured position of the to-be-measured axle 100;

[0097] S3, after the first measuring head 22 and the second measuring head 52 contact the axle 100 to be measured, locking the positions of the first driving device 3 and the second driving device 6;

[0098] S4, rotating the axle 100 to be tested, and obtaining the radial runout of the axle 100 to be tested according to the displacement values ​​obtained by the first displacement detection component 23 and the second displacement detection component 53.

[0099] Specifically, at the beginning of the measurement, the positions of the first probe 22 and the second probe 52 in the measuring mechanism are preliminarily adjusted according to the known maximum diameter of the axle 100 to be measured;

[0100] The first drive device 3 (first servo cylinder 31 ) drives the first measuring head 22 to move along the measuring rod 21 until it contacts the outer diameter side of the axle.

[0101] At the same time, the second driving device 6 (second servo cylinder 61 ) drives the second measuring head 52 to move along the measuring frame 51 until it contacts the other side of the outer diameter of the axle.

[0102] After the first measuring head 22 and the second measuring head 52 contact the axle, the positions of the first driving device 3 and the second driving device 6 are locked to keep the contact between the measuring heads and the axle stable.

[0103] The first elastic buffer component 4 and the second elastic buffer component 7 provide adaptive buffering capability, which can absorb the impact force generated by the servo electric cylinder during the driving process, and avoid directly transmitting it to the axle, thereby preventing the axle surface from being deformed;

[0104] After the positions of the first measuring head 22 and the second measuring head 52 are locked, the axle 100 to be measured is rotated.

[0105] During the rotation of the axle 100 to be measured, the radial runout detected by the first measuring head 22 and the second measuring head 52 is transmitted to the corresponding first slide 12 and the second slide 14 through the respective measuring rods 21 and the measuring frame 51 .

[0106] The runout displacement is finally detected by the first grating scale 231 and the second grating scale 531 , and the runout values ​​Δx measured by the respective grating scales are recorded through the first reading head 232 and the second reading head 532 .

[0107] According to the runout value Δx recorded by the grating ruler reading head, the radial runout value of the axle 100 to be tested is calculated.

[0108] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. An axle radial runout measuring mechanism, which is arranged on one side of an axle (100) to be measured during measurement, and is characterized in that: The axle radial runout measuring mechanism comprises a support seat (1), on which is arranged: A first measuring device (2) comprises a measuring rod (21) slidably connected to the support seat (1), a first measuring head (22) mounted on the end of the measuring rod (21), and a first displacement detection assembly (23) for detecting the displacement of the first measuring head (22); A first driving device (3) is used to drive the measuring rod (21) to move, and a first elastic buffer component (4) is provided between a driving end of the first driving device (3) and the measuring rod (21); A second measuring device (5) comprises a measuring frame (51) slidably connected to the support seat (1), a second measuring head (52) mounted on the measuring frame (51), and a second displacement detection assembly (53) for detecting the displacement of the second measuring head (52), wherein the measuring frame (51) can be arranged across two radial sides of the axle (100) to be measured, and the first measuring head (22) and the second measuring head (52) are arranged opposite to each other and can contact two radial ends of the axle (100) to be measured; The second driving device (6) is used to drive the measuring frame (51) to move, and a second elastic buffer component (7) is provided between the driving end of the first driving device (3) and the measuring frame (51).

2. The axle radial runout measuring mechanism according to claim 1, characterized in that: The support seat (1) is provided with a first guide rail (11) and a first slide table (12) slidably connected to the first guide rail (11), and the measuring rod (21) is mounted on the first slide table (12).

3. The axle radial runout measuring mechanism according to claim 2, characterized in that: The first displacement detection assembly (23) comprises a first grating ruler (231) arranged on the first slide (12) and a first reading head (232) mounted on the support seat (1) and cooperating with the first grating ruler (231).

4. The axle radial runout measuring mechanism according to claim 2, characterized in that: The first elastic buffer assembly (4) comprises a first movable frame (41), a first connecting seat (42), a first spring (43) and a first spring guide column (44); The first movable frame (41) is mounted on the first slide table (12), and the first connecting seat (42) is mounted on the driving end of the first driving device (3); A plurality of the first spring guide pillars (44) pass through the first movable frame (41) and are connected to the first connecting seat (42); the first spring (43) is sleeved on the first spring guide pillars (44); Two ends of the first spring (43) respectively abut against the first movable frame (41) and the first connecting seat (42); The first movable frame (41) is limited by one end of the first spring guide column (44).

5. The axle radial runout measuring mechanism according to claim 4, characterized in that: The first driving device (3) comprises a first servo electric cylinder (31) mounted on the support seat (1), the first servo electric cylinder (31) being slidably connected to a first electric cylinder slide (32) connected to a telescopic rod of the first servo electric cylinder (31), the first electric cylinder slide (32) being connected to the first connecting seat (42).

6. The axle radial runout measuring mechanism according to claim 1, characterized in that: The support seat (1) is provided with a second guide rail (13) and a second slide table (14) slidably connected to the second guide rail (13), and the measuring frame (51) is mounted on the second slide table (14).

7. The axle radial runout measuring mechanism according to claim 6, characterized in that: The second displacement detection assembly (53) comprises a second grating ruler (531) arranged on the second slide (14) and a second reading head (532) mounted on the support seat (1) and cooperating with the second grating ruler (531).

8. The axle radial runout measuring mechanism according to claim 6, characterized in that: The second elastic buffer assembly (7) comprises a second movable frame (71), a second connecting seat (72), a second spring (73) and a second spring guide column (74); The second movable frame (71) is mounted on the second slide table (14), and the second connecting seat (72) is mounted on the driving end of the second driving device (6); A plurality of second spring guide pillars (74) pass through the second movable frame (71) and are connected to the second connecting seat (72); The second spring (73) is sleeved on the second spring guide post (74); Two ends of the second spring (73) respectively abut against one end of the second spring guide column (74) and the second movable frame (71); The second movable frame (71) is limited by one end of the second spring guide column (74).

9. The axle radial runout measuring mechanism according to claim 8, characterized in that: The second driving device (6) comprises a second servo electric cylinder (61) mounted on the support seat (1), the second servo electric cylinder (61) being slidably connected to a second electric cylinder slide (62) connected to a telescopic rod of the second servo electric cylinder (61), and the second electric cylinder slide (62) being connected to the second connecting seat (72).

10. A method for measuring radial runout of an axle, characterized in that: Utilizing the axle radial runout measuring mechanism according to any one of claims 1 to 9, the method comprises: The first drive device (3) drives the first probe (22) to move until the first probe (22) contacts one side of the outer diameter of the to-be-tested position of the to-be-tested axle (100); The second measuring head (52) is driven to move by the second driving device (6) until the second measuring head (52) contacts the other side of the outer diameter of the to-be-measured position of the to-be-measured axle (100); After the first measuring head (22) and the second measuring head (52) contact the axle (100) to be measured, locking the positions of the first driving device (3) and the second driving device (6); The axle (100) to be tested is rotated, and the radial runout of the axle (100) to be tested is obtained according to the displacement values ​​obtained by the first displacement detection component (23) and the second displacement detection component (53).

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