An automated axle measurement apparatus

Abstract

The application relates to an axle automatic measuring device. The application comprises an axle positioning support mechanism for positioning an axle to be measured and capable of driving the axle to be measured to rotate; an axle length measuring mechanism arranged on one side of the axle positioning support mechanism and comprising a base, a radial measuring grating ruler, a moving frame, a radial driving module and a visual device; an axle radial run-out measuring mechanism arranged on one side of the axle positioning support mechanism and comprising a support base and first measuring device, first driving device, second measuring device and second driving device arranged on the support base; and an axial driving module for driving the axle length measuring mechanism and the axle radial run-out measuring mechanism to move together along the axial direction of the axle to be measured. The application can realize accurate and automatic measurement of the length and radial run-out of the axle, and improves the measurement efficiency.

Description

Technical Field

[0001] This invention relates to the field of shaft part measurement technology, and in particular to an automated axle measurement device. Background Technology

[0002] In modern industrial production, axles are critical mechanical components, and their dimensional accuracy and quality are essential to the performance and safety of the entire mechanical system. Traditional axle measurement methods mainly rely on manual operation, which is not only inefficient but also prone to instability and inaccuracy due to the operator's skill level and subjective judgment. Furthermore, manual measurement methods are difficult to meet the demands of high-volume, high-precision production.

[0003] With the development of automation technology, automated axle measurement equipment has emerged. These devices, by integrating advanced sensors, control systems, and data processing software, can quickly and accurately measure axle dimensions, improving measurement accuracy and repeatability. They can also exchange data with other equipment on the production line, enabling intelligent and information-based production processes. However, current axle measurement equipment still has some limitations, such as complex structure, high cost, difficult maintenance, and difficulty in measuring axle segments with rounded corners and chamfers. These limitations restrict their widespread application in axle production. Summary of the Invention

[0004] Therefore, the present invention provides an automated axle measuring device that not only provides high-precision measurement results, but also adapts to the measurement needs of different types of axles, has good adaptability and flexibility, effectively reduces manual intervention, and improves production efficiency and product quality.

[0005] To address the aforementioned technical problems, the present invention provides an automated axle measuring device, comprising a measuring platform, wherein the measuring platform is equipped with:

[0006] Axle positioning and support mechanism is used to position the axle under test and can drive the axle under test to rotate.

[0007] The axle length measuring mechanism is located on one side of the axle positioning support mechanism and includes a base, a radial measuring grating ruler, an axial measuring grating ruler, a moving frame, a radial drive module, and a vision device.

[0008] The radial measuring grating ruler is disposed on the base and extends radially along the axle to be tested; the movable frame is slidably connected to the base along the length of the radial measuring grating ruler; the axial measuring grating ruler is disposed along the axial direction of the axle to be tested; the radial drive module is mounted on the base and drives the movable frame to move; the vision device is mounted on the movable frame.

[0009] The axle radial runout measuring mechanism is disposed on one side of the axle positioning support mechanism, and includes a support base and a first measuring device, a first driving device, a second measuring device and a second driving device disposed on the support base;

[0010] The first measuring device includes a measuring rod slidably connected to the support base, a first probe installed at the end of the measuring rod, and a first displacement detection component for detecting the displacement of the first probe.

[0011] The first driving device is used to drive the measuring rod to move, and a first elastic buffer component is provided between the driving end of the first driving device and the measuring rod;

[0012] The second measuring device includes a measuring frame slidably connected to the support base, a second probe mounted on the measuring frame, and a second displacement detection assembly for detecting the displacement of the second probe. The measuring frame can span across both radial sides of the axle to be measured, and the first probe and the second probe are arranged facing each other and can contact both radial ends of the axle to be measured.

[0013] The second driving device is used to drive the measuring frame to move, and a second elastic buffer component is provided between the driving end of the first driving device and the measuring frame;

[0014] An axial drive module is used to drive the axle length measuring mechanism and the axle radial runout measuring mechanism to move together along the axial direction of the axle to be measured.

[0015] In one embodiment of the present invention, the radial drive module includes:

[0016] The lead screw seat is mounted on the base;

[0017] A lead screw is rotatably connected to the lead screw seat and is arranged parallel to the radial measuring grating ruler;

[0018] A slide rail is mounted on the base and arranged parallel to the lead screw;

[0019] The lead screw nut is slidably connected to the lead screw.

[0020] A slider is connected to the nut and the movable frame respectively and slidably connected to the slide rail; a grating reading head that cooperates with the radial measuring grating ruler is installed on the slider; a photoelectric switch for detecting the position of the slider is installed on one side of the slide rail on the base;

[0021] A power assembly for driving the lead screw to rotate includes a servo drive motor, a first synchronous pulley is mounted on the drive end of the servo drive motor, a second synchronous pulley is mounted on the end of the lead screw, and a synchronous belt connects the first synchronous pulley and the second synchronous pulley.

[0022] In one embodiment of the present invention, the movable frame spans both radial sides of the axle to be tested, and the vision device includes a vision camera and a parallel light source respectively installed at both ends of the movable frame. The vision camera and the parallel light source are arranged facing each other and located on both radial sides of the axle to be tested.

[0023] The movable frame is equipped with a lens bracket and a light source housing. The lens bracket is equipped with a telecentric lens connected to the vision camera, and the light source housing covers the parallel light source.

[0024] In one embodiment of the present invention, the support base is provided with a first guide rail and a first slide table slidably connected to the first guide rail, and the measuring rod is mounted on the first slide table;

[0025] The support base is provided with a second guide rail and a second slide table slidably connected to the second guide rail, and the measuring frame is installed on the second slide table.

[0026] In one embodiment of the present invention, the first displacement detection component includes a first grating ruler disposed on the first slide table and a first reading head installed on the support base and cooperating with the first grating ruler.

[0027] The second displacement detection component includes a second grating ruler disposed on the second slide and a second reading head mounted on the support and cooperating with the second grating ruler.

[0028] 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 post;

[0029] The first movable frame is mounted on the first slide table, and the first connecting seat is mounted on the drive end of the first drive device;

[0030] Multiple first spring guide posts 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 post;

[0031] The two ends of the first spring abut against the first movable frame and the first connecting seat, respectively;

[0032] The first movable frame is limited by one end of the first spring guide post.

[0033] In one embodiment of the present invention, the first driving device includes a first servo electric cylinder mounted on the support base, and a first electric cylinder slide connected to the first servo electric cylinder and the first electric cylinder slide is connected to the first connecting base.

[0034] 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 post;

[0035] The second movable frame is mounted on the second slide table, and the second connecting seat is mounted on the drive end of the second drive device;

[0036] Multiple second spring guide posts pass through the second movable frame and are connected to the second connecting seat;

[0037] The second spring is sleeved on the second spring guide post;

[0038] The two ends of the second spring abut against one end of the second spring guide post and the second movable frame, respectively;

[0039] The second movable frame is limited by one end of the second spring guide post.

[0040] In one embodiment of the present invention, the second driving device includes a second servo electric cylinder mounted on the support base, and a second electric cylinder slide connected to the telescopic rod of the second servo electric cylinder is slidably connected to the second servo electric cylinder, and the second electric cylinder slide is connected to the second connecting base.

[0041] In one embodiment of the present invention, the axle positioning support mechanism includes a rotary drive motor, a servo push cylinder, a lead screw adjustment assembly, and a fixed center assembly and a movable positioning center assembly arranged opposite to each other.

[0042] The measuring platform is equipped with a first support rail;

[0043] The fixed center assembly includes a fixed base, a rotating disk mounted on the fixed base, and a first center and a positioning post mounted on the rotating disk and abutting against a positioning hole on one axial end of the axle to be tested. The rotary drive motor is used to drive the rotating disk to rotate.

[0044] The movable positioning tip assembly includes a movable seat slidably connected to the first support rail, a second support rail disposed on the movable seat, a pusher slidably connected to the second support rail, a fixed plate mounted on the pusher, and a second tip mounted on the fixed plate and abutting against the other end of the axle to be tested along the axial direction. The servo pusher cylinder drive end is connected to the pusher.

[0045] The lead screw adjustment assembly is installed on the measuring platform and is used to drive the movable seat to slide along the first support rail.

[0046] The technical solution of the present invention has the following advantages compared with the prior art:

[0047] The automated axle measuring device described in this invention can achieve accurate and automated measurement of the length and radial runout of the axle, thereby improving measurement efficiency.

[0048] This invention employs a vision device to measure axle length, avoiding the wear and damage to the axle surface caused by traditional contact measurements. It is particularly suitable for measuring the length of axles with curved cross-sections, thus improving the applicability and accuracy of the measurement. By integrating components such as a radial measuring grating ruler, axial and radial drive modules, and the vision device, fully automated axle length measurement is achieved. The vision device can move rapidly at different positions, and with the position feedback from the radial measuring grating ruler, measurement data can be acquired quickly and continuously, greatly improving measurement efficiency and reducing manual intervention and errors.

[0049] This invention incorporates a first and a second elastic buffer assembly in the axle radial runout measuring mechanism. These components provide cushioning when the probe contacts the axle surface, effectively absorbing instantaneous impact forces generated during measurement and preventing direct transmission of these forces to the axle surface. This avoids surface deformation and improves measurement stability and accuracy. Both the first and second measuring devices are adjustable via a slidingly connected measuring rod and measuring frame. The probe automatically adapts to axles of different diameters, ensuring appropriate contact force between the probe and the axle's outer diameter during measurement. This adaptive adjustment capability avoids measurement errors caused by changes in axle diameter, enhancing the device's versatility and applicability. It is suitable for measuring radial runout of axles of various specifications. Attached Figure Description

[0050] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0051] Figure 1 This is a schematic diagram of the overall structure of the automated axle measurement equipment.

[0052] Figure 2 This is a schematic diagram of the overall structure of the axle length measuring mechanism of the present invention from one side view.

[0053] Figure 3 This is a schematic diagram of the overall structure of the axle length measuring mechanism of the present invention from another perspective.

[0054] Figure 4 This is a schematic diagram of the radial drive module of the present invention.

[0055] Figure 5 This is a schematic diagram of the outer shell of the axle length measuring mechanism of the present invention.

[0056] Figure 6 This is a schematic diagram of the structure of the axle measuring device of the present invention.

[0057] Figure 7 This is a schematic diagram of the overall structure of the axle radial runout measuring mechanism of the present invention from one side view.

[0058] Figure 8 This is a schematic diagram of the overall structure of the axle radial runout measuring mechanism of the present invention from another side view.

[0059] Figure 9 This is a side view of the axle radial runout measuring mechanism of the present invention.

[0060] Figure 10 This is a schematic diagram of the structure of the first measuring device of the present invention.

[0061] Figure 11 This is a schematic diagram of the structure of the second measuring device of the present invention.

[0062] Figure 12 This is an exploded structural diagram of the first elastic buffer component of the present invention.

[0063] Figure 13 This is an exploded structural diagram of the second elastic buffer component of the present invention.

[0064] Figure 14 This is a schematic diagram of the protective shell structure of the axle radial runout measuring mechanism of the present invention.

[0065] Figure 15 This is a schematic diagram of the axle positioning support mechanism of the present invention.

[0066] Figure 16 This is a schematic diagram of the arrangement structure of the axle length measuring mechanism and the axle radial runout measuring mechanism of the present invention during testing.

[0067] Figure 17 This is a structural schematic diagram of the fixed top component of the present invention.

[0068] Figure 18 This is a schematic diagram of the structure of the active positioning tip component of the present invention.

[0069] Figure 19 This is a schematic diagram of the axle side structure of the axle to be tested in this invention.

[0070] Explanation of reference numerals on the accompanying drawings:

[0071] 100. Axle to be tested; 110. Axle body; 120. First journal; 130. Second journal;

[0072] 200. Measurement platform;

[0073] 300. Axle positioning support mechanism; 3-1. Rotary drive motor; 3-2. Servo push cylinder; 3-3. Fixed center assembly; 3-31. Fixed seat; 3-32. Rotary disk; 3-33. First center; 3-34. Positioning column; 3-4. Movable positioning center assembly; 3-41. Movable seat; 3-42. Fixed disk; 3-43. Second center; 3-5. First support rail; 3-6. Second support rail; 3-7. Push seat; 3-8. Screw adjustment assembly;

[0074] 400. Axle length measuring mechanism; 4-1. Base; 4-11. Photoelectric switch; 4-12. Housing;

[0075] 4-2. Radial measuring grating ruler; 4-21. Grating reading head;

[0076] 4-3, Radial drive module; 4-31, Lead screw seat; 4-32, Lead screw; 4-33, Slide rail; 4-34, Nut; 4-35, Slider; 4-36, Servo drive motor; 4-37, First synchronous pulley; 4-38, Second synchronous pulley; 4-39, Synchronous belt;

[0077] 4-4. Mobile frame;

[0078] 4-6. Vision device; 4-61. Vision camera; 4-62. Parallel light source; 4-63. Lens support; 4-64. Light source housing; 4-65. Telecentric lens;

[0079] 4-7. Axial measurement grating ruler;

[0080] 500. Axle radial runout measuring mechanism; 5-1. Support base; 5-11. First guide rail; 5-12. First slide table; 5-13. Second guide rail; 5-14. Second slide table; 5-15. Protective shell;

[0081] 5-2. First measuring device; 5-21. Measuring rod; 5-22. First probe; 5-23. First displacement detection assembly; 5-231. First grating ruler; 5-232. First reading head;

[0082] 5-3, First drive device; 5-31, First servo electric cylinder; 5-32, First electric cylinder slide;

[0083] 5-4. First elastic buffer assembly; 5-41. First movable frame; 5-42. First connecting seat; 5-43. First spring; 5-44. First spring guide post;

[0084] 5-5. Second measuring device; 5-51. Measuring frame; 5-52. Second probe; 5-53. Second displacement detection assembly; 5-531. Second grating ruler; 5-532. Second reading head;

[0085] 5-6. Second drive unit; 5-61. Second servo electric cylinder; 5-62. Second electric cylinder slide;

[0086] 5-7. Second elastic buffer assembly; 5-71. Second movable frame; 5-72. Second connecting seat; 5-73. Second spring; 5-74. Second spring guide post;

[0087] 600, Axial drive module. Detailed Implementation

[0088] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0089] In this invention, when directions (up, down, left, right, front, and back) are described, it is only for the convenience of describing the technical solution of this invention, and does not indicate or imply that the technical features referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0090] In this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," "exceeding," etc., are understood to exclude the stated number; "above," "below," "within," etc., are understood to include the stated number. In the description of this invention, the terms "first" and "second" are used only to distinguish technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0091] In this invention, unless otherwise explicitly defined, the terms "setting," "installing," and "connecting" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; a fixed connection, a detachable connection, or an integrally formed connection; a mechanical connection, an electrical connection, or a connection capable of mutual communication; or the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this invention based on the specific content of the technical solution.

[0092] Reference Figure 1 , Figure 2 , Figure 7 As shown, an automated axle measuring device of the present invention includes a measuring platform 200, on which:

[0093] The axle positioning support mechanism 300 is used to position the axle 100 to be tested and can drive the axle 100 to be tested to rotate; the axle 100 to be tested includes an axle body 110 and a first journal 120 and a second journal 130 respectively connected to both ends of the axle body 110.

[0094] The axle length measuring mechanism 400 is disposed on one side of the axle positioning support mechanism 300, and includes a base 4-1, a radial measuring grating ruler 4-2, an axial measuring grating ruler 4-7, a moving frame 4-4, a radial drive module 4-3, and a vision device 4-6.

[0095] The radial measuring grating ruler 4-2 is disposed on the base 4-1 and extends radially along the axle 100 to be tested; the movable frame 4-4 is slidably connected to the base 4-1 along the length of the radial measuring grating ruler 4-2; the axial measuring grating ruler 4-7 is disposed along the axial direction of the axle 100 to be tested; the radial drive module 4-3 is mounted on the base 4-1 and drives the movable frame 4-4 to move; and the vision device 4-6 is mounted on the movable frame 4-4.

[0096] The axle radial runout measuring mechanism 500 is disposed on one side of the axle positioning support mechanism 300, and includes a support base 5-1 and a first measuring device 5-2, a first driving device 5-3, a second measuring device 5-5 and a second driving device 5-6 disposed on the support base 5-1.

[0097] The first measuring device 5-2 includes a measuring rod 5-21 slidably connected to the support base 5-1, a first probe 5-22 installed at the end of the measuring rod 5-21, and a first displacement detection component 5-23 for detecting the displacement of the first probe 5-22.

[0098] The first driving device 5-3 is used to drive the measuring rod 5-21 to move, and a first elastic buffer component 5-4 is provided between the driving end of the first driving device 5-3 and the measuring rod 5-21.

[0099] The second measuring device 5-5 includes a measuring frame 5-51 slidably connected to the support base 5-1, a second probe 5-52 mounted on the measuring frame 5-51, and a second displacement detection assembly 5-53 for detecting the displacement of the second probe 5-52. The measuring frame 5-51 can span across both radial sides of the axle 100 to be tested. The first probe 5-22 and the second probe 5-52 are arranged facing each other and can contact both radial ends of the axle 100 to be tested.

[0100] The second driving device 5-6 is used to drive the measuring frame 5-51 to move, and a second elastic buffer component 5-7 is provided between the driving end of the first driving device 5-3 and the measuring frame 5-51.

[0101] An axial drive module 600 is used to drive the axle length measuring mechanism 400 and the axle radial runout measuring mechanism 500 to move together along the axial direction of the axle to be measured 100.

[0102] In one embodiment, refer to Figure 3 , Figure 4 As shown, the radial drive module 4-3 includes:

[0103] The lead screw seat 4-31 is installed on the base 4-1;

[0104] The lead screw 4-32 is rotatably connected to the lead screw seat 4-31 and is arranged parallel to the radial measuring grating ruler 4-2;

[0105] The slide rail 4-33 is installed on the base 4-1 and arranged parallel to the lead screw 4-32;

[0106] Nut 4-34 is slidably connected to lead screw 4-32;

[0107] The slider 4-35 is connected to the nut 4-34 and the movable frame 4-4 respectively and slidably connected to the slide rail 4-33; a grating reading head 4-21 that cooperates with the radial measuring grating ruler 4-2 is installed on the slider 4-35; in addition, a reading head that cooperates with the axial drive module is also installed on the base. A photoelectric switch 4-11 for detecting the position of the slider 4-35 is installed on one side of the slide rail 4-33 on the base 4-1.

[0108] A power assembly for driving the lead screw 4-32 to rotate includes a servo drive motor 4-36, a first synchronous pulley 4-37 mounted on the drive end of the servo drive motor 4-36, a second synchronous pulley 4-38 mounted on the end of the lead screw 4-32, and a synchronous belt 4-39 connecting the first synchronous pulley 4-37 and the second synchronous pulley 4-38.

[0109] Precise linear motion control is achieved through the combination of a ball screw 4-32 and a slide rail 4-33. The ball screw 4-32 structure effectively reduces friction and provides high-precision positioning, while the slide rail 4-33 design ensures smooth and reliable motion. The power unit drives the ball screw 4-32 to rotate, thereby driving the linear movement of the nut 4-34 and the slider 4-35. This structure enables precise axial positioning within a small space, making it suitable for measurement scenarios requiring high precision and stability.

[0110] In one embodiment, refer to Figure 2 , Figure 3 As shown, the movable frame 4-4 spans the radial sides of the axle 100 to be tested. The vision device 4-6 includes a vision camera 4-61 and a parallel light source 4-62 respectively installed at both ends of the movable frame 4-4. The vision camera 4-61 and the parallel light source 4-62 are arranged facing each other and located on the radial sides of the axle 100 to be tested.

[0111] The movable frame 4-4 is equipped with a lens bracket 4-63 and a light source housing 4-64. The lens bracket 4-63 is equipped with a telecentric lens 4-65 connected to the vision camera 4-61. The light source housing 4-64 covers the parallel light source 4-62.

[0112] The Vision Camera 4-61 is an industrial digital camera used to capture images. It can convert the physical characteristics of an object (such as shape, color, and texture) into digital image data. Its core components typically include an image sensor (such as a CCD or CMOS sensor), a lens, and an image processing chip.

[0113] The 4-65 telecentric lens is a special type of industrial lens. It is a lens that maintains a constant magnification within a certain working distance range, and the image size obtained by the 4-65 telecentric lens will not change with the displacement of the object.

[0114] The visual device 4-6 (visual camera 4-61) extracts the line shapes on both sides (a and b) at the connection between the first journal 120 and the second journal 130 and the axle body 110, wherein the line shapes are arcs and / or straight lines.

[0115] The vision device 4-6 (including vision camera 4-61 and telecentric lens 4-65) is mounted on the moving frame 4-4 and is capable of capturing and analyzing images of different parts of the axle. Through image processing algorithms, the vision device 4-6 can extract images of various features on the axle.

[0116] By combining a vision camera 4-61 with radial measuring grating ruler 4-2 and axial measuring grating ruler 4-7, and through the high-precision position feedback of the radial measuring grating ruler 4-2 and axial measuring grating ruler 4-7 and the image processing of the vision device 4-6, feature points at different parts of the axle (such as the connection point between the journal and the axle body 110, point C) can be accurately located, thereby achieving high-precision axle length measurement and ensuring the accuracy and consistency of the measurement.

[0117] Reference Figure 5 As shown, in order to protect the internal components, a housing 4-12 that cooperates with the base 4-1 is also provided. The housing 4-12 can cover each device, allowing only the movable frame 4-4 and the vision device 4-6 to protrude.

[0118] S1. The vision device 4-6 moves to one radial side of the first journal 120 to obtain the first radial grating ruler coordinate system position, the first axial grating ruler coordinate system position, and the first visual coordinate system position of the first intersection point. The vision device 4-6 moves to the other radial side of the first journal 120 to obtain the second radial grating ruler coordinate system position, the second axial grating ruler coordinate system position, and the second visual coordinate system position of the second intersection point. Wherein, the first intersection point and the second intersection point are respectively the connection points of the first journal 120 and the axle body 110 on the radial sides of the first journal 120.

[0119] S2. Determine the world coordinate system position of the first intersection point based on the position of the first radial grating ruler coordinate system, the position of the first axial grating ruler coordinate system, and the position of the first visual coordinate system; determine the world coordinate system position of the second intersection point based on the position of the second radial grating ruler coordinate system, the position of the second axial grating ruler coordinate system, and the position of the second visual coordinate system.

[0120] S3. The vision device 4-6 moves to one radial side of the second journal 130 to obtain the third radial grating ruler coordinate system position, the third axial grating ruler coordinate system position, and the third visual coordinate system position of the third intersection point. The vision device 4-6 moves to the other radial side of the second journal 130 to obtain the fourth radial grating ruler coordinate system position, the fourth axial grating ruler coordinate system position, and the fourth visual coordinate system position of the fourth intersection point. The third intersection point and the fourth intersection point are respectively the connection points of the second journal 130 and the axle body 110 on the radial sides of the second journal 130.

[0121] S4. Determine the world coordinate system position of the third intersection point based on the position of the third radial grating ruler coordinate system, the position of the third axial grating ruler coordinate system, and the position of the third visual coordinate system; determine the world coordinate system position of the fourth intersection point based on the position of the fourth radial grating ruler coordinate system, the position of the fourth axial grating ruler coordinate system, and the position of the fourth visual coordinate system.

[0122] S5. Obtain the first line segment between the position in the first visual coordinate system and the position in the second visual coordinate system, and the second line segment between the position in the third visual coordinate system and the position in the fourth visual coordinate system;

[0123] S6. The length of the axle body 110 is obtained based on the length of the perpendicular line from the midpoint of the first line segment to the second line segment.

[0124] The specific operation is as follows: At the start of the measurement, the vision device 4-6 is moved to the far left of the axle. Then, the axial drive module 600 moves the vision device 4-6 to the first journal 120 on the left side of the length of the axle to be measured 100, and the reading of the axial measurement grating ruler 4-7 is recorded at this time to obtain the grating X coordinate;

[0125] The radial drive module 4-3 drives the vision camera 4-61 to move up and down, ensuring that the field of view of the vision camera 4-61 can cover the top of the axle 100 under test, and records the reading of the radial measurement grating ruler 4-2 at this time to obtain the grating Z coordinate.

[0126] If one side of the journal being measured has a chamfer (arc), first extract the arc curve on the chamfer side (arc side) of the journal, and then extract the straight line on the other side of the journal;

[0127] If there is no chamfer (rounded arc) on one side of the journal, directly extract the vertical line on that side, and then extract the line on the other side of the journal.

[0128] The (first and second) intersection points of the extracted circular arc (or straight line) and the straight line are calculated. Given the resolution of the industrial camera, the visual coordinate system positions of these intersection points (including the visual coordinate system X and Z coordinates of the intersection points) are determined; the world coordinate system X coordinates of the intersection points can be determined based on the grating X coordinates and the visual coordinate system X coordinates, and the world coordinate system Z coordinates of the intersection points can be determined based on the grating Z coordinates and the visual coordinate system Z coordinates.

[0129] The radial drive module 4-3 drives the vision camera 4-61 to move downward, so that the field of view of the vision camera 4-61 can include the bottom of the axle under test 100, and the reading of the grating reading head 4-21 is recorded again.

[0130] Feature extraction is performed again on the circular arc side (if any) and straight side of the journal. Based on the intersection position in the camera coordinate system and the radial and axial grating ruler coordinate system positions, the intersection position in the world coordinate system is transformed. The two intersection points measured above and below are connected into a line segment (the first line segment).

[0131] Repeat the above steps to perform the same measurement and recording operations on the second journal 130 on the right side, obtain the corresponding grating position and the intersection point in the world coordinate system, and connect them to form another line segment (the second line segment).

[0132] Finally, draw a perpendicular line from the midpoint (midpoint coordinates) of the first line segment to the second line segment. Determine the length of the axle to be measured based on the length of this perpendicular line (the distance between the midpoint coordinates of the first and second line segments).

[0133] It should be understood that the visual coordinate system is the coordinate system defined by the vision device 4-6 (industrial camera). It is typically based on the pixel coordinates of the camera sensor and is used to describe the relative position of objects in the image captured by the camera. The grating ruler coordinate system is the coordinate system defined by the grating ruler. The world coordinate system is a fixed, global reference coordinate system used to describe the absolute position within the entire measurement system. All measurement results must ultimately be transformed to this coordinate system to ensure the uniformity and consistency of the measurement data.

[0134] In this embodiment, the relationship between the visual coordinate system, the grating ruler coordinate system, and the world coordinate system is pre-calibrated by establishing transformation relationships between different coordinate systems. By converting the measurement positions in the visual coordinate system and the grating ruler coordinate system into positions in the world coordinate system, it is ensured that all measurements are performed in the same coordinate system, thereby guaranteeing the consistency and accuracy of the measurement results.

[0135] The above measurement method can handle axles of different shapes and features, including length measurement between journals with circular arc sections or between circular arc sections and non-circular arc sections. It is applicable to axles of various complex shapes, can adapt to axles of different diameters and lengths, and has a wide range of applications.

[0136] In one embodiment, refer to Figures 9 to 11 As shown, the support base 5-1 is provided with a first guide rail 5-11 and a first slide table 5-12 slidably connected to the first guide rail 5-11, and the measuring rod 5-21 is installed on the first slide table 5-12;

[0137] The support base 5-1 is provided with a second guide rail 5-13 and a second slide table 5-14 slidably connected to the second guide rail 5-13, and the measuring frame 5-51 is installed on the second slide table 5-14.

[0138] Reference Figure 9 As shown, both the first guide rail 5-11 and the second guide rail 5-13 are cross roller guide rails, but other guide rail structures may also be used. Both the first probe 5-22 and the second probe 5-52 are made of alloy.

[0139] In one embodiment, as shown in the figure, the first displacement detection component 5-23 includes a first grating ruler 5-231 disposed on the first slide table 5-12 and a first reading head 5-232 mounted on the support 5-1 and cooperating with the first grating ruler 5-231.

[0140] The second displacement detection component 5-53 includes a second grating ruler 5-531 disposed on the second slide table 5-14 and a second reading head 5-532 mounted on the support base 5-1 and cooperating with the second grating ruler 5-531.

[0141] Reference Figure 12 As shown, the first elastic buffer assembly 5-4 includes a first movable frame 5-41, a first connecting seat 5-42, a first spring 5-43, and a first spring guide post 5-44;

[0142] The first movable frame 5-41 is mounted on the first slide table 5-12, and the first connecting seat 5-42 is mounted on the drive end of the first drive device 5-3;

[0143] Multiple first spring guide posts 5-44 pass through the first movable frame 5-41 and are connected to the first connecting seat 5-42; the first spring 5-43 is sleeved on the first spring guide posts 5-44.

[0144] The two ends of the first spring 5-43 abut against the first movable frame 5-41 and the first connecting seat 5-42, respectively;

[0145] The first movable frame 5-41 is limited by one end of the first spring guide post 5-44.

[0146] Reference Figure 10 As shown, the first driving device 5-3 includes a first servo electric cylinder 5-31 mounted on the support base 5-1. A first electric cylinder slide 5-32 connected to the telescopic rod of the first servo electric cylinder 5-31 is slidably connected to the first servo electric cylinder 5-31. The first electric cylinder slide 5-32 is connected to the first connecting base 5-42.

[0147] Reference Figure 13 As shown, the second elastic buffer assembly 5-7 includes a second movable frame 5-71, a second connecting seat 5-72, a second spring 5-73, and a second spring guide post 5-74;

[0148] The second movable frame 5-71 is installed on the second slide table 5-14, and the second connecting seat 5-72 is installed on the drive end of the second drive device 5-6;

[0149] Multiple second spring guide posts 5-74 pass through the second movable frame 5-71 and are connected to the second connecting seat 5-72;

[0150] The second spring 5-73 is sleeved on the second spring guide post 5-74;

[0151] The two ends of the second spring 5-73 abut against one end of the second spring guide post 5-74 and the second movable frame 5-71, respectively;

[0152] The second movable frame 5-71 is limited by one end of the second spring guide post 5-74.

[0153] Reference Figure 11 As shown, the second drive device 5-6 includes a second servo electric cylinder 5-61 mounted on the support base 5-1. A second electric cylinder slide 5-62 connected to the telescopic rod of the second servo electric cylinder 5-61 is slidably connected to the second servo electric cylinder 5-61. The second electric cylinder slide 5-62 is connected to the second connecting base 5-72.

[0154] Understandably, when the first servo cylinder 5-31 pushes the first probe 5-22 towards the axle surface, the probe will contact the outer diameter surface of the axle, and the first spring 5-43 will be compressed. Since the first probe 5-22 is connected to the first movable frame 5-41 through the measuring rod 5-21, the displacement of the first probe 5-22 will cause the first movable frame 5-41 to be subjected to force through the first spring 5-43.

[0155] The first spring 5-43 can provide a buffering force. When the first probe 5-22 contacts the axle, if there is an instantaneous impact force, the first spring 5-43 will absorb the impact force and prevent it from being directly transmitted to the axle surface.

[0156] Furthermore, during the measurement process, when the first probe 5-22 is displaced, it will cause the first movable frame 5-41 to be displaced accordingly (the first spring 5-43 is always in contact with the first movable frame 5-41), so that it can be detected by the first measuring device 5-2.

[0157] The elastic coefficient of the first spring 5-43 provides an appropriate reaction force according to the actual measurement requirements, so that the contact force of the first probe 5-22 on the axle can be adaptively adjusted, thereby effectively preventing the axle from deforming due to excessive force during the measurement process.

[0158] When the second servo cylinder 5-61 pulls the second probe 5-52 toward the axle surface, the second spring 5-73 is compressed. Since the second probe 5-52 is connected to the first movable frame 5-41 through the measuring frame 5-51, the displacement of the second probe 5-52 will cause the second movable frame 5-71 to be subjected to force through the second spring 5-73.

[0159] The second spring 5-73 can provide a buffering force. When the second probe 5-52 contacts the axle, if there is an instantaneous impact force, the impact force will be absorbed by the second spring 5-73 to prevent it from being directly transmitted to the axle surface.

[0160] Furthermore, during the measurement process, when the second probe 5-52 is displaced, it will cause the second movable frame 5-71 to be displaced accordingly (the second spring 5-73 is always in contact with the second movable frame 5-71), so that it can be detected by the second measuring device 5-5.

[0161] The elastic coefficient of the second spring 5-73 provides an appropriate reaction force according to the actual measurement requirements, so that the contact force of the second probe 5-52 on the axle can be adaptively adjusted, thereby effectively preventing the axle from deforming due to excessive force during the measurement process.

[0162] By setting the first elastic buffer component 5-4 and the second elastic buffer component 5-7, the deformation of the axle surface caused by the impact force generated during the servo electric cylinder drive can be effectively reduced. Utilizing the elastic coefficients of the first spring 5-43 and the second spring 5-73, the probe can adaptively adjust the force applied to the axle. This mechanism has flexible measurement capabilities, automatically adjusting the distance between the first probe 5-22 and the second probe 5-52 according to changes in the diameter of the axle 100 to accommodate axles of different diameters.

[0163] Reference Figure 14 As shown, in order to protect the internal components, a protective shell 5-15 is also provided that cooperates with the support base 5-1. The protective shell 5-15 can cover each device, allowing only the first probe 5-22, the measuring rod 5-21, the measuring frame 5-51, and the second probe 5-52 to protrude.

[0164] During measurement, the axle radial runout measuring mechanism 500 moves axially along the axle 100 under test via the axial drive module 600, moving to the outer diameter position of the axle 100 under test.

[0165] The detection methods for the axle radial runout measuring mechanism 500 include:

[0166] S1. Drive the first probe 5-22 to move through the first drive device 5-3 until the first probe 5-22 contacts the outer diameter side of the test position of the axle 100 to be tested;

[0167] S2. Drive the second probe 5-52 to move through the second drive device 5-6 until the second probe 5-52 contacts the other side of the outer diameter of the test position of the axle 100 to be tested;

[0168] S3. After the first probe 5-22 and the second probe 5-52 contact the axle to be tested 100, lock the positions of the first drive device 5-3 and the second drive device 5-6.

[0169] S4. Rotate the axle 100 to be tested, and obtain the radial runout of the axle 100 to be tested based on the displacement values ​​obtained by the first displacement detection component 5-23 and the second displacement detection component 5-53.

[0170] Specifically, at the start of the measurement, the positions of the first probe 5-22 and the second probe 5-52 in the measuring mechanism are initially adjusted based on the known maximum diameter of the axle 100 to be measured.

[0171] The first drive device 5-3 (first servo electric cylinder 5-31) drives the first probe 5-22 to move along the measuring rod 5-21 until it contacts the outer diameter side of the axle.

[0172] At the same time, the second drive device 5-6 (second servo electric cylinder 5-61) drives the second probe 5-52 to move along the measuring frame 5-51 until it contacts the other side of the outer diameter of the axle.

[0173] After the first probe 5-22 and the second probe 5-52 contact the axle, the positions of the first drive device 5-3 and the second drive device 5-6 are locked to maintain stable contact between the measuring head and the axle.

[0174] The first elastic buffer component 5-4 and the second elastic buffer component 5-7 provide adaptive buffering capability, which can absorb the impact force generated by the servo electric cylinder during the driving process and avoid direct transmission to the axle, thereby preventing the axle surface from deforming.

[0175] After locking the positions of the first probe 5-22 and the second probe 5-52, rotate the axle to be tested by 100.

[0176] During the rotation of the axle 100 under test, the radial runout detected by the first probe 5-22 and the second probe 5-52 is transmitted to the corresponding first slide 5-12 and second slide 5-14 through their respective measuring rods 5-21 and measuring frames 5-51.

[0177] The runout displacement is ultimately detected by the first grating ruler 5-231 and the second grating ruler 5-531, and the runout value ∆x measured by the respective grating ruler is recorded by the first reading head 5-232 and the second reading head 5-532.

[0178] The radial runout value of the axle 100 under test is calculated based on the runout value ∆x recorded by the grating ruler reading head.

[0179] In one embodiment, as shown with reference to the figure, the axial drive module 600 includes a servo linear module.

[0180] In one embodiment, as shown in the figure, the axle positioning support mechanism 300 includes a rotary drive motor 3-1, a servo push cylinder 3-2, a lead screw adjustment assembly 3-8, and a fixed center assembly 3-3 and a movable positioning center assembly 3-4 arranged opposite to each other.

[0181] The measuring platform 200 is provided with a first support rail 3-5.

[0182] Reference Figure 17As shown, the fixed center assembly 3-3 includes a fixed base 3-31, a rotating disk 3-32 mounted on the fixed base 3-31, and a first center 3-33 and a positioning post 3-34 mounted on the rotating disk 3-32 and abutting against a positioning hole (as shown in the figure) on one axial end of the axle to be tested 100. The rotary drive motor 3-1 is used to drive the rotating disk 3-32 to rotate.

[0183] Reference Figure 18 As shown, the movable positioning tip assembly 3-4 includes a movable seat 3-41 slidably connected to the first support rail 3-5, a second support rail 3-6 disposed on the movable seat 3-41, a pusher 3-7 slidably connected to the second support rail 3-6, a fixed plate 3-42 mounted on the pusher 3-7, and a second tip 3-43 mounted on the fixed plate 3-42 and abutting against the other end of the axle under test 100. The drive end of the servo pusher 3-2 is connected to the pusher 3-7.

[0184] The lead screw adjustment assembly 3-8 is installed on the measuring platform 200 and is used to drive the movable seat 3-41 to slide along the first support rail 3-5.

[0185] In addition, the servo pusher cylinder 3-2 is equipped with a pressure monitoring sensor to ensure stable clamping force and to achieve precise positioning and safe clamping of the extension position according to different shaft types.

[0186] The first tip 3-33, the second tip 3-43, and the positioning post 3-34 are made of elastic material to prevent scratching the axle during rotation.

[0187] In one embodiment, a gantry robot, an RFID reader, a buffer mechanism, and a control system are also provided; wherein, the gantry robot is responsible for loading and unloading the axles, and the RFID reader automatically reads the axle information;

[0188] The control system includes a workstation machine, which adopts a workstation machine control method to improve the flexibility and convenience of operation; the control system includes a Chinese operation interface module: the control panel adopts a Chinese operation interface, which has operation wizard and work prompt functions. The interface is simple and easy to understand, can display measurement data in real time, and has data storage, printing, query and management functions, as well as data out-of-tolerance alarm function.

[0189] The buffer mechanism is used to store multiple axles and has corresponding positioning devices and workpiece detection functions to facilitate the gantry robot to pick up and deliver the axles and provide real-time feedback on the current axle storage status; by setting corresponding photoelectric sensors on the buffer mechanism, it is possible to detect whether the workpiece is stored on the buffer mechanism.

[0190] In addition, the automated measuring equipment has a three-color alarm light, which illuminates differently depending on the situation: the green light is always on or flashing when the equipment is working normally; the yellow light is always on or flashing when the equipment exceeds the measurement tolerance; and the red light is always on or flashing and accompanied by a buzzer alarm when the equipment malfunctions or the emergency stop is pressed.

[0191] During operation, the axle under test 100 is first placed in the buffer mechanism, awaiting subsequent measurement preparation.

[0192] The gantry robot transfers the axle from the buffer mechanism to the axle positioning support mechanism 300 for positioning.

[0193] The axle is lifted and fixed in position by the fixed center assembly 3-3 and the movable positioning center assembly 3-4. At the same time, the rotary drive device drives the axle to rotate through the threaded hole at the end of the axle, ensuring that it maintains the correct posture during the measurement process.

[0194] The RFID reader automatically reads the axle information, and each measuring component automatically measures the dimensions of various parts of the axle based on the read information.

[0195] After measurement, the axle is released and removed from the axle positioning support mechanism 300. The measurement data is input into a computer-aided measuring instrument for display and uploaded to the control system.

[0196] When the gantry robot removes the axle from the measuring equipment, the control system automatically determines the pass / fail status of the measurement data. Non-conforming products can undergo secondary inspection; if they still fail, they are treated as defective parts. Defective parts can be released as conforming parts after manual verification to ensure the final product quality.

[0197] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An automated axle measuring device, characterized in that, Includes a measurement platform (200), on which are provided: Axle positioning support mechanism (300) is used to position the axle to be tested (100) and can drive the axle to be tested (100) to rotate; The axle length measuring mechanism (400) is located on one side of the axle positioning support mechanism (300) and includes a base (4-1), a radial measuring grating ruler (4-2), an axial measuring grating ruler (4-7), a moving frame (4-4), a radial drive module (4-3), and a vision device (4-6). The radial measuring grating ruler (4-2) is disposed on the base (4-1) and extends radially along the axle (100) to be tested; the movable frame (4-4) is slidably connected to the base (4-1) along the length direction of the radial measuring grating ruler (4-2); the axial measuring grating ruler (4-7) is disposed along the axial direction of the axle (100) to be tested; the radial drive module (4-3) is mounted on the base (4-1) and drives the movable frame (4-4) to move; the vision device (4-6) is mounted on the movable frame (4-4). The axle radial runout measuring mechanism (500) is disposed on one side of the axle positioning support mechanism (300), and includes a support base (5-1) and a first measuring device (5-2), a first driving device (5-3), a second measuring device (5-5), and a second driving device (5-6) disposed on the support base (5-1). The first measuring device (5-2) includes a measuring rod (5-21) slidably connected to the support base (5-1), a first probe (5-22) installed at the end of the measuring rod (5-21), and a first displacement detection component (5-23) for detecting the displacement of the first probe (5-22). The first driving device (5-3) is used to drive the measuring rod (5-21) to move, and a first elastic buffer assembly (5-4) is provided between the driving end of the first driving device (5-3) and the measuring rod (5-21). The second measuring device (5-5) includes a measuring frame (5-51) slidably connected to the support base (5-1), a second probe (5-52) mounted on the measuring frame (5-51), and a second displacement detection assembly (5-53) for detecting the displacement of the second probe (5-52). The measuring frame (5-51) can be arranged across both radial sides of the axle (100) to be measured. The first probe (5-22) and the second probe (5-52) are arranged facing each other and can contact the radial ends of the axle (100) to be measured. The second driving device (5-6) is used to drive the measuring frame (5-51) to move, and a second elastic buffer assembly (5-7) is provided between the driving end of the first driving device (5-3) and the measuring frame (5-51). An axial drive module (600) is used to drive the axle length measuring mechanism (400) and the axle radial runout measuring mechanism (500) to move together along the axial direction of the axle to be measured (100); The movable frame (4-4) spans across both radial sides of the axle under test (100). The vision device (4-6) includes a vision camera (4-61) and a parallel light source (4-62) respectively installed at both ends of the movable frame (4-4). The vision camera (4-61) and the parallel light source (4-62) are arranged facing each other and located on both radial sides of the axle under test (100). The movable frame (4-4) is equipped with a lens bracket (4-63) and a light source housing (4-64). The lens bracket (4-63) is equipped with a telecentric lens (4-65) connected to the vision camera (4-61). The light source housing (4-64) covers the parallel light source (4-62).

2. The automated axle measuring device according to claim 1, characterized in that, The radial drive module (4-3) includes: A lead screw seat (4-31) is installed on the base (4-1). The lead screw (4-32) is rotatably connected to the lead screw seat (4-31) and is arranged parallel to the radial measuring grating ruler (4-2). The slide rail (4-33) is installed on the base (4-1) and is arranged parallel to the lead screw (4-32). The lead screw (4-34) is slidably connected to the lead screw (4-32). The slider (4-35) is connected to the nut (4-34) and the movable frame (4-4) respectively and is slidably connected to the slide rail (4-33); the slider (4-35) is equipped with a grating reading head (4-21) that cooperates with the radial measuring grating ruler (4-2); the base (4-1) is equipped with a photoelectric switch (4-11) for detecting the position of the slider (4-35) on one side of the slide rail (4-33). A power assembly for driving the lead screw (4-32) to rotate includes a servo drive motor (4-36), a first synchronous pulley (4-37) is mounted on the drive end of the servo drive motor (4-36), a second synchronous pulley (4-38) is mounted on the end of the lead screw (4-32), and a synchronous belt (4-39) is connected between the first synchronous pulley (4-37) and the second synchronous pulley (4-38).

3. The automated axle measuring device according to claim 1, characterized in that, The support base (5-1) is provided with a first guide rail (5-11) and a first slide (5-12) slidably connected to the first guide rail (5-11), and the measuring rod (5-21) is installed on the first slide (5-12). The support base (5-1) is provided with a second guide rail (5-13) and a second slide (5-14) slidably connected to the second guide rail (5-13), and the measuring frame (5-51) is installed on the second slide (5-14).

4. The automated axle measuring device according to claim 3, characterized in that, The first displacement detection component (5-23) includes a first grating ruler (5-231) disposed on the first slide (5-12) and a first reading head (5-232) mounted on the support (5-1) and cooperating with the first grating ruler (5-231). The second displacement detection component (5-53) includes a second grating ruler (5-531) disposed on the second slide (5-14) and a second reading head (5-532) mounted on the support (5-1) and cooperating with the second grating ruler (5-531).

5. The automated axle measuring device according to claim 3, characterized in that, The first elastic buffer assembly (5-4) includes a first movable frame (5-41), a first connecting seat (5-42), a first spring (5-43), and a first spring guide post (5-44). The first movable frame (5-41) is mounted on the first slide (5-12), and the first connecting seat (5-42) is mounted on the drive end of the first drive device (5-3); Multiple first spring guide posts (5-44) pass through the first movable frame (5-41) and are connected to the first connecting seat (5-42), and the first spring (5-43) is sleeved on the first spring guide post (5-44). The first spring (5-43) abuts against the first movable frame (5-41) and the first connecting seat (5-42) at both ends respectively; The first movable frame (5-41) is limited by one end of the first spring guide post (5-44).

6. The automated axle measuring device according to claim 5, characterized in that, The first drive device (5-3) includes a first servo electric cylinder (5-31) mounted on the support base (5-1). A first electric cylinder slide (5-32) connected to the telescopic rod of the first servo electric cylinder (5-31) is slidably connected to the first servo electric cylinder (5-31). The first electric cylinder slide (5-32) is connected to the first connecting base (5-42).

7. The automated axle measuring device according to claim 3, characterized in that, The second elastic buffer assembly (5-7) includes a second movable frame (5-71), a second connecting seat (5-72), a second spring (5-73), and a second spring guide post (5-74); The second movable frame (5-71) is mounted on the second slide (5-14), and the second connecting seat (5-72) is mounted on the drive end of the second drive device (5-6); Multiple second spring guide posts (5-74) pass through the second movable frame (5-71) and are connected to the second connecting seat (5-72); The second spring (5-73) is sleeved on the second spring guide post (5-74); The two ends of the second spring (5-73) abut against one end of the second spring guide post (5-74) and the second movable frame (5-71), respectively; The second movable frame (5-71) is limited by one end of the second spring guide post (5-74).

8. The automated axle measuring device according to claim 7, characterized in that, The second drive device (5-6) includes a second servo electric cylinder (5-61) mounted on the support base (5-1). A second electric cylinder slide (5-62) connected to the telescopic rod of the second servo electric cylinder (5-61) is slidably connected to the second servo electric cylinder (5-61). The second electric cylinder slide (5-62) is connected to the second connecting base (5-72).

9. The automated axle measuring device according to claim 1, characterized in that, The axle positioning support mechanism (300) includes a rotary drive motor (3-1), a servo push cylinder (3-2), a lead screw adjustment assembly (3-8), and a fixed center assembly (3-3) and a movable positioning center assembly (3-4) arranged opposite to each other. The measuring platform (200) is provided with a first support rail (3-5). The fixed center assembly (3-3) includes a fixed base (3-31), a rotating disk (3-32) mounted on the fixed base (3-31), and a first center (3-33) and a positioning post (3-34) mounted on the rotating disk (3-32) and abutting against a positioning hole on one axial end of the axle to be tested (100). The rotary drive motor (3-1) is used to drive the rotating disk (3-32) to rotate. The movable positioning tip assembly (3-4) includes a movable seat (3-41) slidably connected to the first support rail (3-5), a second support rail (3-6) disposed on the movable seat (3-41), a push seat (3-7) slidably connected to the second support rail (3-6), a fixed plate (3-42) mounted on the push seat (3-7), and a second tip (3-43) mounted on the fixed plate (3-42) and abutting against the other end of the axial direction of the axle under test (100). The drive end of the servo push cylinder (3-2) is connected to the push seat (3-7). The lead screw adjustment assembly (3-8) is installed on the measuring platform (200) and is used to drive the movable seat (3-41) to slide along the first support rail (3-5).

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