Automobile hub roundness detection device

Abstract

The invention discloses automobile hub roundness detection equipment, which relates to the field of automobile detection, and adopts the technical scheme that the automobile hub roundness detection equipment comprises a base provided with a turnover cover plate, a rotary table is arranged on the base, a positioning clamp used for mounting a hub is arranged on the rotary table, and a detection mechanism used for detecting the roundness of the hub is further arranged on the base. The transmission mechanism is used for driving the positioning clamp and the detection mechanism to work; the detection mechanism comprises a swing arm rotationally arranged on the base, two detection units are arranged at the movable end of the swing arm, a sleeve is further rotationally arranged on the base, a ring sleeve is rotationally arranged in the middle of the swing arm, an adjusting rod is rotationally arranged in the ring sleeve, and the adjusting rod is in threaded connection with the sleeve. The device has the beneficial effects that the device is adaptive to hubs of different models, the installation mode is simple and rapid, the abnormal areas on the surfaces of the hubs can be automatically marked, and the detection precision and efficiency are improved.

Description

Technical Field

[0001] The present invention relates to the field of automobile detection, and in particular to an automobile wheel hub roundness detection device. Background Art

[0002] Automobile inspection is an examination to determine the technical condition or working ability of the automobile. After the automobile wheel hub is completed and during regular maintenance, it needs to be tested for roundness. Deformed wheel hubs will cause the automobile to vibrate violently, produce friction noise and abnormal deceleration during use, which will directly affect the life safety of the driver and passengers.

[0003] After searching, the Chinese invention patent with publication number CN117450895A discloses a vehicle wheel hub roundness detection device and a detection method thereof, which specifically relates to the field of vehicle wheel hub detection. The vehicle wheel hub roundness detection device includes: a turntable; a placement table, which is fixed on the turntable; a lifting frame and a lifting platform that can be lifted and lowered in the lifting frame; a guide rod, which is horizontally fixed on the lifting platform; a slider, which is slidably sleeved on the guide rod, and a spring is provided between the slider and the lifting platform; a push rod, which is provided on the slider; a paper feed frame; a paper tape, which is flatly laid on the paper feed frame; the paper tape is driven to move synchronously by the turntable, so that the marking pen draws a continuous curve on the paper tape that intuitively reflects the radial runout deviation range of the wheel hub.

[0004] Since this invention patent obtains the radial runout range of the hub through the longitudinal extreme value of the continuous curve, thereby judging whether the roundness of the hub is qualified, it is impossible to mark the hub in actual use. Therefore, when an unqualified situation is detected, the staff needs to mark and locate the unqualified area again. The operation process is cumbersome and easily causes problems of inaccurate marking and positioning. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention provides an automobile wheel hub roundness detection device.

[0006] The technical solution is as follows: it includes a base with a reversible cover, a turntable provided on the base, a positioning fixture for mounting the wheel hub provided on the turntable, a detection mechanism for detecting the roundness of the wheel hub, and a transmission mechanism for driving the positioning fixture and the detection mechanism; The detection mechanism includes a swing arm rotatably mounted on the base, two detection units being mounted on the movable end of the swing arm, a sleeve being rotatably mounted on the base, a ring being rotatably mounted in the middle of the swing arm, an adjustment rod being rotatably mounted in the ring, and the adjustment rod being threadedly connected to the sleeve; The positioning fixture includes a rotating spindle rotatably arranged on the turntable, a fixed platform fixedly arranged on the upper end of the rotating spindle, the fixed platform abutting against the inner wall of the wheel hub spoke, a screw rod fixedly arranged on the fixed platform, a rotating handle threadedly connected to the screw rod, and a fitting portion is arranged between the rotating handle and the wheel hub; The detection unit includes a screw rotatably arranged at the movable end, the screws of the two detection units are coaxial, and each screw is threadedly connected to a slider, and the slider is slidably connected to the swing arm; The movable end of the swing arm is also rotatably provided with a transmission rod, the axis of the transmission rod is parallel to the axis of the screw, and the lower end of the transmission rod is connected to the transmission mechanism; Two guide sleeves are provided on one side of the slider toward the transmission rod, the guide sleeves are sleeved on the outside of the transmission rod, a gear is provided between the two guide sleeves, and the gear is slidably connected to the transmission rod; A marking rod is slidably provided on one side of the slider, a plurality of teeth are provided on one end of the marking rod close to the gear, and a marking pen is fixedly provided on the other end; A trigger unit is provided on the slider located on one side of the marking rod, and the trigger unit is linked to the marking rod.

[0007] Preferably, the trigger unit includes a detection feeler rod slidably arranged on the slider, a trigger head is provided at one end of the detection feeler rod close to the marking pen, and a spring is provided between the trigger head and the slider; Two conical trigger bosses are arranged opposite to each other in the middle of the detection feeler rod, and the small ends of the two trigger bosses are opposite to each other. Two groups of controllers are arranged between the two trigger bosses, and each group of controllers is slidably connected to the slider respectively, and a tension spring is arranged between the two groups of controllers.

[0008] Preferably, the controller includes a locking pin slidably arranged on the slider, a fixing rod is fixedly arranged on one side of the locking pin, and a semicircular trigger ring is fixedly arranged on one end of the fixing rod away from the locking pin, and the two trigger rings of the two groups of controllers are located between the two trigger bosses and are arranged on opposite sides of the detection touch rod; Two slots are provided in the middle of the marking rod, and each locking pin is respectively engaged with an adjacent slot.

[0009] Preferably, an L-shaped shift fork is rotatably provided on one of the guide sleeves located below, the middle portion of the shift fork is rotatably connected to the guide sleeve, the movable end of the shift fork is located below the gear, and a control boss is provided on a side of the shift fork close to the marking rod; A pushing boss is fixedly provided on one end of the marking rod close to the tooth.

[0010] Preferably, the thickness of the gear is half the thickness of the marking rod, and the teeth on the marking rod are located in the upper half of the marking rod.

[0011] Preferably, the transmission mechanism includes a first connecting rod rotatably connected to the rotating main shaft, a movable end of the first connecting rod is rotatably provided with a second connecting rod, and a movable end of the second connecting rod is rotatably connected to the transmission rod; A sprocket is rotatably provided at each end of the first connecting rod and the second connecting rod, and the two sprockets on the first connecting rod and the second connecting rod are connected by a chain. The two sprockets at one end of the first connecting rod and the second connecting rod are coaxially fixedly connected; A driving motor is also fixedly arranged on the base, and a motor shaft of the driving motor is coaxially fixed with the rotating main shaft.

[0012] The technical solution provided by the embodiment of the present invention has the following beneficial effects: it is adaptable to different types of wheel hubs, the installation method is simple and quick, and abnormal areas on the wheel hub surface can be automatically marked, thereby improving detection accuracy and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Schematic diagram of the overall structure of an embodiment of the present invention.

[0014] Figure 2 Schematic diagram of a positioning fixture and a transmission mechanism according to an embodiment of the present invention.

[0015] Figure 3 Schematic diagram of a detection mechanism according to an embodiment of the present invention.

[0016] Figure 4 Schematic diagram of a detection unit according to an embodiment of the present invention.

[0017] Figure 5 Schematic diagram of a marking rod and a trigger unit according to an embodiment of the present invention.

[0018] Figure 6 Schematic diagram of a marking rod, gear and shift fork according to an embodiment of the present invention.

[0019] Among them, the accompanying drawings are marked as follows: 1. base; 2. positioning fixture; 3. detection mechanism; 4. transmission mechanism; 5. swing arm; 6. detection unit; 7. sleeve; 8. adjustment rod; 9. rotating spindle; 10. fixed table; 11. rotating handle; 12. fitting part; 13. screw; 14. transmission rod; 15. slider; 16. guide sleeve; 17. gear; 18. marking rod; 19. teeth; 20. trigger unit; 21. detection touch rod; 22. trigger boss; 23. controller; 24. locking pin; 25. trigger ring; 26. slot; 27. shift fork; 28. control boss; 29. push boss; 30. first connecting rod; 31. second connecting rod; 32. sprocket; 33. chain; 34. drive motor; 35. hub. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. Of course, the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0021] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0022] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, features defined as "first", "second" and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0023] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art can understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0024] See also Figures 1 to 6 The present invention provides an automobile wheel hub roundness detection device, comprising a base 1 provided with a reversible cover plate, a turntable provided on the base 1, a positioning fixture 2 for mounting a wheel hub 35 provided on the turntable, a detection mechanism 3 for detecting the roundness of the wheel hub 35, and a transmission mechanism 4 for driving the positioning fixture 2 and the detection mechanism 3 to operate; The detection mechanism 3 includes a swing arm 5 rotatably set on the base 1, two detection units 6 are set at the movable end of the swing arm 5, a sleeve 7 is also rotatably set on the base 1, an internal thread is set in the sleeve 7, a ring is rotatably set in the middle of the swing arm 5, an adjusting rod 8 is rotatably set in the ring, the outer wall of the adjusting rod 8 is set with an external thread, and the adjusting rod 8 is threadedly connected to the sleeve 7.

[0025] First, install the wheel hub 35 on the positioning fixture 2, and then according to the size specifications of the wheel hub 35, rotate the adjusting rod 8 to make the movable end of the swing arm 5 close to the wheel hub 35, and then place the detection unit 6 on the outer wall of the wheel hub 35 accordingly. The detection unit 6 detects the data of each point on the outer surface of the wheel hub 35 to monitor the shape deviation of the wheel hub 35 in the circumferential direction.

[0026] The positioning fixture 2 includes a rotating spindle 9 rotatably arranged on a turntable, a fixed platform 10 is fixedly arranged on the upper end of the rotating spindle 9, the fixed platform 10 is abutted against the inner wall of the spoke of the hub 35, and a screw rod is also fixedly arranged on the fixed platform 10, and a rotating handle 11 is threadedly connected to the screw rod, and a fitting portion 12 is arranged between the rotating handle 11 and the hub 35.

[0027] The fitting portion 12 is in the shape of an inverted truncated cone. A passage for the screw rod to pass through is provided in the middle of the fitting portion 12 . The fitting portion 12 can adapt to the center holes of different hubs 35 .

[0028] Before installing the hub 35, first remove the rotating handle 11 and the fitting part 12, then place the hub 35 on the fixed platform 10, pass the screw through the center hole of the hub 35, and then install the fitting part 12 and the rotating handle 11 to fix the hub 35 on the positioning fixture 2.

[0029] The detection unit 6 includes a screw 13 rotatably mounted at a movable end. A knob is fixedly mounted on each of the two screws 13 at opposite ends. The position of the slider 15 is adjusted by rotating the knob to detect different positions on the outer surface of the hub 35. The screws 13 of the two detection units 6 are coaxial. A slider 15 is threadedly connected to each screw 13. The slider 15 is slidably connected to the swing arm 5. The movable end of the swing arm 5 is also rotatably provided with a transmission rod 14 , the axis of the transmission rod 14 is parallel to the axis of the screw rod 13 , and the lower end of the transmission rod 14 is connected to the transmission mechanism 4 .

[0030] Two guide sleeves 16 are provided on one side of the slider 15 facing the transmission rod 14. The guide sleeves 16 are sleeved on the outside of the transmission rod 14. A gear 17 is provided between the two guide sleeves 16. The gear 17 is slidably connected to the transmission rod 14. A marking rod 18 is slidably provided on one side of the slider 15. A plurality of teeth 19 are provided on one end of the marking rod 18 close to the gear 17, and a marking pen is fixedly provided on the other end. A tension spring is provided between the marking rod 18 and the slider 15; A trigger unit 20 is provided on the slider 15 located on one side of the marking rod 18 , and the trigger unit 20 is linked to the marking rod 18 .

[0031] When the trigger unit 20 detects that the surface of the wheel hub 35 is out of round, the trigger unit 20 starts immediately. Under the action of the tension spring, the marking rod 18 moves toward the side of the wheel hub 35. The marking pen fixed at one end of the marking rod 18 can leave a clear mark at the corresponding position on the surface of the wheel hub 35, accurately indicating the position of the roundness abnormality, making it convenient for subsequent operators to quickly locate the problem area.

[0032] The trigger unit 20 includes a detection feeler rod 21 slidably disposed on the slider 15 , a trigger head is disposed at one end of the detection feeler rod 21 close to the marking pen, and a spring is disposed between the trigger head and the slider 15 ; Two conical trigger bosses 22 are set opposite to each other in the middle of the detection feeler rod 21, and the small ends of the two trigger bosses 22 are opposite to each other. Two groups of controllers 23 are set between the two trigger bosses 22. Each group of controllers 23 is slidably connected to the slider 15, and a tension spring is set between the two groups of controllers 23.

[0033] Before the trigger unit 20 is used, the trigger head is first brought into contact with the outer surface of the hub 35. The spring between the trigger head and the slider 15 is in a certain compressed state, and the controller 23 is in the middle position of the two trigger bosses 22, providing a basis for the subsequent action of the controller 23. As the device is started, the hub 35 begins to rotate under the action of the positioning fixture 2, and the detection unit 6 detects the roundness of the hub 35. When an abnormality occurs in a certain area of the surface of the hub 35, causing the roundness deviation to reach the trigger condition of the trigger unit 20, the detection feeler 21, under the action of the spring, keeps the trigger head always in contact with the hub 35. The outer surfaces of the wheel hub 35 are in contact, and the detection feeler rod 21 moves toward one side of the wheel hub 35. At this time, the two trigger bosses 22 in the middle of the detection feeler rod 21 also move accordingly. The two controllers 23 move in opposite directions under the action of one of the trigger bosses 22. When the controller 23 moves a certain stroke, the marking rod 18 moves toward one side of the wheel hub 35 under the action of the tension spring. The marking pen fixed at one end of the marking rod 18 can leave a clear mark at the corresponding position on the surface of the wheel hub 35, accurately indicating the position of the roundness abnormality, which is convenient for subsequent operators to quickly locate the problem area.

[0034] The controller 23 includes a locking pin 24 slidably mounted on the slider 15. A fixing rod is fixedly mounted on one side of the locking pin 24. A semi-circular trigger ring 25 is fixedly mounted on the end of the fixing rod away from the locking pin 24. The two trigger rings 25 of the two controllers 23 are located between the two trigger bosses 22 and are disposed on opposite sides of the detection feeler rod 21. Two locking slots 26 are provided in the middle of the marking rod 18 , and each locking pin 24 is engaged with an adjacent one of the locking slots 26 .

[0035] When an abnormality occurs in a certain area of the wheel hub 35 surface, causing the roundness deviation to reach the trigger condition of the trigger unit 20, the detection feeler rod 21, under the action of the spring, keeps the trigger head in contact with the outer surface of the wheel hub 35 at all times, and the detection feeler rod 21 moves toward one side of the wheel hub 35. At this time, the two trigger bosses 22 in the middle of the detection feeler rod 21 also move accordingly. Under the action of one of the trigger bosses 22, the two controllers 23 gradually squeeze the two trigger rings 25, and the two trigger rings 25 drive the controllers 23 to move in opposite directions. When the controller 23 moves a certain stroke, that is, when the locking pin 24 is separated from the slot 26, the marking rod 18 moves toward the side of the wheel hub 35 under the action of the tension spring. The marking pen fixed at one end of the marking rod 18 can leave a clear mark at the corresponding position on the surface of the wheel hub 35, accurately indicating the location of the roundness abnormality, making it convenient for subsequent operators to quickly locate the problem area.

[0036] An L-shaped shift fork 27 is rotatably mounted on a guide sleeve 16 located below. The middle portion of the shift fork 27 is rotatably connected to the guide sleeve 16. The movable end of the shift fork 27 is located below the gear 17. A control boss 28 is provided on the side of the shift fork 27 close to the marking rod 18. A pushing boss 29 is fixedly provided on one end of the marking rod 18 close to the tooth 19 .

[0037] The thickness of the gear 17 is half the thickness of the marking rod 18 , and the teeth 19 on the marking rod 18 are located in the upper half of the marking rod 18 .

[0038] When an abnormality occurs in a certain area of the wheel hub 35 surface, causing the roundness deviation to reach the trigger condition of the trigger unit 20, the marking rod 18 moves toward the side of the wheel hub 35 under the action of the tension spring, and as the marking rod 18 moves, until the pushing boss 29 is in contact with the control boss 28, when the marking rod 18 continues to move, the pushing boss 29 pushes the control boss 28 to move, thereby driving the shift fork 27 to rotate, and the movable end of the shift fork 27 pushes the gear 17 upward. At this time, the gear 17 and the teeth 19 on the marking rod 18 are engaged with each other. When the transmission rod 14 rotates, the teeth 19 on the gear 17 and the marking rod 18 are engaged with each other. The teeth 19 drive the marking rod 18 to move to the side away from the hub 35. Under the action of the tension spring, the marking rod 18 applies a reaction force to the gear 17. The gear 17 can always engage with the teeth 19 to facilitate the movement of the marking rod 18 until the locking pin 24 is engaged in the slot 26 of the marking rod 18, which is convenient for the next detection. In this state, after the marking rod 18 does not apply a reaction force to the gear 17, the gear 17 slides downward under the action of its own gravity, and the gear 17 is separated from the teeth 19 of the marking rod 18. The teeth 19 on the marking rod 18 will not affect the rotation of the gear 17.

[0039] The transmission mechanism 4 includes a first connecting rod 30 rotatably connected to the rotating main shaft 9, a second connecting rod 31 is rotatably provided at the movable end of the first connecting rod 30, and a movable end of the second connecting rod 31 is rotatably connected to the transmission rod 14; A sprocket 32 is rotatably provided at each end of the first connecting rod 30 and the second connecting rod 31 , and the two sprockets 32 on the first connecting rod 30 and the second connecting rod 31 are connected by a chain 33 ; The first connecting rod 30 and the second connecting rod 31 are coaxially fixedly connected to the two sprockets 32 at one end of the mutually rotating end; A driving motor 34 is also fixedly mounted on the base 1 , and a motor shaft of the driving motor 34 is coaxially fixed with the rotating main shaft 9 .

[0040] Under the action of the first connecting rod 30 and the second connecting rod 31 , no matter what position the swing arm 5 is in, when the rotating main shaft 9 rotates, it can drive the transmission rod 14 to rotate synchronously through the sprocket 32 and the chain 33 .

[0041] When the present invention is used, the wheel hub 35 is first mounted on the positioning fixture 2, and then, according to the size specifications of the wheel hub 35, the adjusting rod 8 is rotated to make the movable end of the swing arm 5 close to the wheel hub 35, and then the detection unit 6 is placed on the outer wall of the wheel hub 35 accordingly. The data of each point on the outer surface of the wheel hub 35 is detected by the detection unit 6 to monitor the shape deviation of the wheel hub 35 in the circumferential direction.

[0042] When an abnormality occurs in a certain area on the surface of the wheel hub 35, causing the roundness deviation to reach the trigger condition of the trigger unit 20, the marking rod 18 moves toward the side of the wheel hub 35 under the action of the tension spring. The marking pen fixed at one end of the marking rod 18 can leave a clear mark at the corresponding position on the surface of the wheel hub 35, accurately indicating the location of the roundness abnormality, making it convenient for subsequent operators to quickly locate the problem area.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An automobile wheel hub roundness detection device, characterized in that: The invention comprises a base (1) provided with a reversible cover plate, a turntable provided on the base (1), a positioning fixture (2) for mounting a wheel hub (35) provided on the turntable, a detection mechanism (3) for detecting the roundness of the wheel hub (35) provided on the base (1), and a transmission mechanism (4) for driving the positioning fixture (2) and the detection mechanism (3) to operate; The detection mechanism (3) comprises a swing arm (5) rotatably arranged on the base (1), two detection units (6) are arranged at the movable end of the swing arm (5), a sleeve (7) is also rotatably arranged on the base (1), a ring sleeve is rotatably arranged in the middle of the swing arm (5), an adjustment rod (8) is rotatably arranged in the ring sleeve, and the adjustment rod (8) is threadedly connected to the sleeve (7).

2. The automobile wheel hub roundness detection device according to claim 1, characterized in that: The positioning fixture (2) includes a rotating spindle (9) rotatably arranged on the turntable, a fixed platform (10) is fixedly arranged on the upper end of the rotating spindle (9), the fixed platform (10) is in contact with the inner wall of the spoke of the hub (35), a screw rod is also fixedly arranged on the fixed platform (10), and a rotating handle (11) is threadedly connected to the screw rod, and a fitting portion (12) is provided between the rotating handle (11) and the hub (35).

3. The automobile wheel hub roundness detection device according to claim 2, characterized in that: The detection unit (6) includes a screw (13) rotatably arranged at the movable end, the screws (13) of the two detection units (6) are coaxial, and each screw (13) is threadedly connected to a slider (15), and the slider (15) is slidably connected to the swing arm (5); The movable end of the swing arm (5) is also rotatably provided with a transmission rod (14), the axis of the transmission rod (14) is parallel to the axis of the screw rod (13), and the lower end of the transmission rod (14) is connected to the transmission mechanism (4).

4. The automobile wheel hub roundness detection device according to claim 3, characterized in that: Two guide sleeves (16) are provided on one side of the slider (15) toward the transmission rod (14), the guide sleeves (16) are sleeved on the outside of the transmission rod (14), a gear (17) is provided between the two guide sleeves (16), and the gear (17) is slidably connected to the transmission rod (14); A marking rod (18) is slidably provided on one side of the slider (15), a plurality of teeth (19) are provided on one end of the marking rod (18) close to the gear (17), and a marking pen is fixedly provided on the other end; A trigger unit (20) is provided on the slider (15) located on one side of the marking rod (18), and the trigger unit (20) is linked to the marking rod (18).

5. The automobile wheel hub roundness detection device according to claim 4, characterized in that: The trigger unit (20) comprises a detection feeler rod (21) slidably arranged on the slider (15), a trigger head is arranged at one end of the detection feeler rod (21) close to the marking pen, and a spring is arranged between the trigger head and the slider (15); Two conical trigger bosses (22) are arranged opposite to each other in the middle of the detection feeler rod (21), and the small ends of the two trigger bosses (22) are opposite to each other. Two groups of controllers (23) are arranged between the two trigger bosses (22), and each group of controllers (23) is slidably connected to the slider (15), and a tension spring is arranged between the two groups of controllers (23).

6. The automobile wheel hub roundness detection device according to claim 5, characterized in that: The controller (23) includes a locking pin (24) slidably arranged on the slider (15), a fixing rod is fixedly arranged on one side of the locking pin (24), and a semicircular trigger ring (25) is fixedly arranged on one end of the fixing rod away from the locking pin (24), and the two trigger rings (25) of the two groups of the controllers (23) are located between the two trigger bosses (22) and are arranged on opposite sides of the detection touch rod (21); Two slots (26) are provided in the middle of the marking rod (18), and each locking pin (24) is respectively engaged with an adjacent slot (26).

7. The automobile wheel hub roundness detection device according to claim 6, characterized in that: An L-shaped shift fork (27) is rotatably provided on a guide sleeve (16) located below, the middle portion of the shift fork (27) is rotatably connected to the guide sleeve (16), the movable end of the shift fork (27) is located below the gear (17), and a control boss (28) is provided on a side of the shift fork (27) close to the marking rod (18); A pushing boss (29) is fixedly provided at one end of the marking rod (18) close to the tooth (19).

8. The automobile wheel hub roundness detection device according to claim 7, characterized in that: The thickness of the gear (17) is half the thickness of the marking rod (18), and the teeth (19) on the marking rod (18) are located in the upper half of the marking rod (18).

9. The automobile wheel hub roundness detection device according to claim 3, characterized in that: The transmission mechanism (4) includes a first connecting rod (30) rotatably connected to the rotating main shaft (9), a second connecting rod (31) is rotatably provided at a movable end of the first connecting rod (30), and a movable end of the second connecting rod (31) is rotatably connected to the transmission rod (14); A sprocket (32) is rotatably provided at each end of the first connecting rod (30) and the second connecting rod (31), and the two sprockets (32) on the first connecting rod (30) and the second connecting rod (31) are connected via a chain (33); The first connecting rod (30) and the second connecting rod (31) are coaxially fixedly connected to the two sprockets (32) at one end of the mutually rotating end; A drive motor (34) is also fixedly arranged on the base (1), and the motor shaft of the drive motor (34) is coaxially fixed with the rotating main shaft (9).

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