An automatic detection device for a rear wheel hub of an electric vehicle

Abstract

The application discloses an automatic detection device for a rear wheel hub of an electric vehicle, which comprises a detection table, a positioning assembly for positioning the wheel hub is rotatably connected to the detection table, and a plurality of expansion strips capable of expanding radially and cooperating with the conical block are fixed to the upper end of the rotating cylinder; the automatic detection device further comprises a liquid supply assembly and a driving assembly, the liquid supply assembly is used for driving the movement of the piston block, and the driving assembly is used for driving the rotation of the rotating cylinder; through the cooperative matching of the positioning assembly, the detection assembly, the liquid supply assembly and the driving assembly, automatic expansion positioning and synchronous rotation detection of the wheel hub are realized; the cooperation of the detection roller and the spring ensures that the detection roller is always attached to the outer circle of the wheel hub, the laser transmitter and the receiver accurately collect the data of the roundness and the radius, and the liquid supply assembly and the detection assembly are linked through the synchronous block, so that the operation steps are simplified, the problems of poor detection precision, many semi-automatic detection steps and large labor intensity are effectively solved, and the detection efficiency and precision are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of electric vehicle rear wheel hub detection technology, and more particularly to an automatic detection device for electric vehicle rear wheel hubs. Background Technology

[0002] Three-wheeled electric vehicles are widely used for short-distance transportation and daily commuting due to their convenience, economy, and moderate load-bearing capacity. As a core load-bearing and transmission component, the rear wheel hub's machining precision and surface quality directly affect the vehicle's driving safety, stability, and service life. Key inspection indicators for the rear wheel hub include the inner diameter of the hub, the outer diameter, the rim thickness, the position and size of bolt holes, and defects such as surface scratches and cracks. These indicators require high precision; failure to meet inspection standards can lead to difficulties in hub assembly, transmission jamming, and even safety hazards such as breakage or axle detachment during operation.

[0003] like Figure 10 The image shows the rear wheel hub of a three-wheeled electric vehicle. When inspecting it, such as the radius and outer roundness of the rear wheel hub, manual or semi-automatic inspection methods are often used. Manual inspection relies on the experience of the inspectors, who use tools such as calipers and micrometers to measure the dimensions of the rear wheel hub, resulting in poor accuracy and large human error. Semi-automatic inspection devices are mostly used to inspect a single indicator. Inspecting the radius and outer roundness of the rear wheel hub requires two steps, increasing the number of steps and the workload.

[0004] Therefore, this application proposes an automatic detection device for the rear wheel hub of an electric vehicle. Summary of the Invention

[0005] The purpose of this invention is to solve the above-mentioned technical problems by providing an automatic detection device for the rear wheel hub of an electric vehicle.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: An automatic detection device for the rear wheel hub of an electric vehicle includes a detection platform. A positioning component for positioning the wheel hub is rotatably connected to the detection platform. The positioning component includes a rotating cylinder with a piston block sliding inside. A pull rod is fixed to the upper end of the piston block, and a conical block is fixed to the upper end of the pull rod. A plurality of tensioning strips that cooperate with the conical block and can expand radially are fixed to the upper end of the rotating cylinder. It also includes a detection component, which includes an electric push rod, the output end of which is connected to a movable part, the other end of which is fixed to a mounting bracket, a detection roller that rotates inside the mounting bracket and abuts against a hub, a laser emitter above the electric push rod, and a laser receiver above the detection roller. It also includes a liquid supply assembly and a drive assembly. The liquid supply assembly is used to drive the movement of the piston block, and the drive assembly is used to drive the rotating cylinder to rotate.

[0007] Preferably, it further includes a support mechanism, which includes a mounting plate that is fitted onto the outer wall of the rotating cylinder and has an interference fit with it. The upper end of the mounting plate is fixed with a support plate for supporting the wheel hub by bolts. The upper end of the mounting plate is equipped with four inserts for use with the wheel hub.

[0008] Preferably, the detection assembly further includes a mounting bracket fixed to the upper end of the detection platform, and the electric push rod and the laser emitter are both mounted on the mounting bracket.

[0009] Preferably, the detection assembly further includes a slider fixed to the bottom of the mounting frame, and two guide rails are fixed to the upper end of the detection stage, with the slider sliding on the guide rails.

[0010] Preferably, the movable component includes a sleeve fixed on the mounting bracket, a movable block slidably connected inside the sleeve, a spring fixed to one end of the movable block, the other end of the spring fixedly connected to the inner wall of the sleeve, a drive rod fixedly fixed on the movable block, and the drive rod fixedly connected to the output end of the electric push rod.

[0011] Preferably, a support frame is fixed to the upper end of the mounting frame, the laser receiver is mounted on the support frame, and the laser emitter is arranged correspondingly to the laser receiver.

[0012] Preferably, the liquid supply assembly includes a movable plate disposed below the mounting frame and moving synchronously with the mounting frame, a fixed plate fixed to the bottom of the detection platform, a liquid storage part fixed on the fixed plate, the other end of the liquid storage part fixed to the movable plate, and the liquid storage part connected to the rotating cylinder through a delivery hose.

[0013] Preferably, a rotary joint is installed at the bottom of the rotating cylinder, and the delivery hose is connected to the rotary joint via a threaded joint.

[0014] Preferably, the testing platform is provided with a sliding groove running through its upper and lower parts, and an L-shaped synchronizing block is slidably connected in the sliding groove. The upper end of the synchronizing block is fixed to the drive rod, and the lower end of the synchronizing block is connected to the upper end of the movable plate.

[0015] Preferably, the drive assembly includes a frame fixed to the bottom of the testing table, a motor mounted on the frame, a first bevel gear fixed to the output end of the motor, and a second bevel gear fixed to the rotating cylinder, wherein the first bevel gear meshes with the second bevel gear.

[0016] Compared with the prior art, the beneficial effects of this invention are as follows: 1. The detection roller is driven by an electric push rod to fit against the outer wall of the wheel hub. With the help of a laser emitter and a laser receiver, the radius and outer roundness deviation of the wheel hub can be calculated simultaneously by using the laser signal offset when the rotating cylinder driven by the motor rotates the wheel hub. This eliminates the need for two-step detection, greatly reducing the number of detection steps and the amount of labor required.

[0017] 2. The liquid supply component and the detection component are linked. When the electric push rod pushes the detection roller close to the hub, the synchronizing block drives the movable plate to stretch the liquid storage part. The hydraulic oil is drawn out from the rotating cylinder, causing the piston block to move down. The conical block moves down, causing the tensioning strip to expand radially, automatically completing the tensioning and positioning of the inner hole of the hub. No manual operation is required, avoiding the problems of manual detection relying on experience, poor accuracy, and large human error.

[0018] 3. A spring is installed in the moving parts to ensure that the detection roller is always in close contact with the outer wall of the hub. Even if there are slight undulations on the outer circle of the hub, the detection roller will not be dislodged from the hub, thus ensuring the continuity and accuracy of the detection data.

[0019] 4. By adding a liquid storage tank, a liquid outlet pipe, and a solenoid valve, when the cone block is jammed during the detection of small hubs, the solenoid valve can be opened to continue replenishing hydraulic oil, ensuring that the device can work normally for hubs of different sizes.

[0020] In summary, this invention achieves automatic tensioning and positioning of the wheel hub and synchronous rotation detection through the coordinated operation of the positioning component, detection component, liquid supply component, and drive component. The cooperation between the detection roller and the spring ensures that it always fits the outer circle of the wheel hub. The laser emitter and receiver accurately collect the outer circle and radius data. Furthermore, the liquid supply component and the detection component are linked through a synchronization block, which simplifies the operation steps and effectively solves the problems of poor accuracy in manual detection, numerous semi-automated detection steps, and high labor intensity, significantly improving detection efficiency and accuracy. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of an automatic detection device for the rear wheel hub of an electric vehicle according to Embodiment 1 of the present invention; Figure 2 This is a three-dimensional structural schematic diagram of an automatic detection device for the rear wheel hub of an electric vehicle according to Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the positioning component in an automatic detection device for the rear wheel hub of an electric vehicle according to Embodiment 1 of the present invention. Figure 4 This is a three-dimensional structural diagram of the detection component in an automatic detection device for the rear wheel hub of an electric vehicle according to Embodiment 1 of the present invention. Figure 5 This is a front view schematic diagram of the detection component in an automatic detection device for the rear wheel hub of an electric vehicle according to Embodiment 1 of the present invention. Figure 6This is a schematic diagram of the moving parts in an automatic detection device for the rear wheel hub of an electric vehicle according to Embodiment 1 of the present invention; Figure 7 This is a schematic diagram of the liquid supply component in an automatic detection device for the rear wheel hub of an electric vehicle according to Embodiment 1 of the present invention. Figure 8 This is a schematic diagram of the drive assembly in an automatic detection device for the rear wheel hub of an electric vehicle according to Embodiment 1 of the present invention. Figure 9 This is a schematic diagram of the support mechanism in an automatic detection device for the rear wheel hub of an electric vehicle according to Embodiment 1 of the present invention. Figure 10 A schematic diagram of the structure of the rear wheel hub of an electric vehicle; Figure 11 This is a schematic diagram of the support mechanism in an automatic detection device for the rear wheel hub of an electric vehicle according to Embodiment 2 of the present invention.

[0022] In the diagram: 100 Inspection table, 110 Slide groove, 200 Wheel hub, 300 Positioning assembly, 310 Rotary cylinder, 320 Tensioner bar, 330 Tie rod, 340 Piston block, 350 Conical block, 400 Inspection assembly, 410 Fixture, 411 Electric push rod, 412 Laser emitter, 413 Mounting bracket, 414 Support bracket, 415 Laser receiver, 416 Inspection roller, 417 Moving part, 4171 Sleeve, 4172 Spring, 4173 Moving block, 4174 Drive. Rod, 418 slider, 4181 guide rail, 4182 rail groove, 419 synchronization block, 500 liquid supply assembly, 510 fixed plate, 520 liquid storage section, 530 movable plate, 540 delivery hose, 550 rotary joint, 560 liquid outlet pipe, 561 solenoid valve, 570 liquid storage tank, 600 drive assembly, 610 motor, 620 frame, 630 first bevel gear, 640 second bevel gear, 700 support mechanism, 710 support plate, 720 mounting plate, 730 insert. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Example

[0024] Reference Figures 1-10 An automatic detection device for the rear wheel hub of an electric vehicle, comprising: The testing platform 100 serves as the mounting base for the entire device. It is made of high-strength cast iron to ensure stability during the testing process and prevent vibrations from affecting testing accuracy. A positioning assembly 300 is rotatably connected to the testing platform 100. The positioning assembly 300 is used to precisely position the wheel hub 200, ensuring that the wheel hub 200 does not shift during testing. Its specific structure includes a rotating cylinder 310, which is rotatably connected to the testing platform 100 via bearings. Deep groove ball bearings are used to ensure both flexible rotation of the rotating cylinder 310 and the ability to withstand certain radial loads.

[0025] A piston block 340 is slidably fitted inside the rotating cylinder 310. The piston block 340 and the inner wall of the rotating cylinder 310 are sealed with a sealing ring to prevent liquid leakage. A pull rod 330 is fixed to the upper end of the piston block 340 by welding. The pull rod 330 and the piston block 340 are coaxially arranged. A conical block 350 is integrally formed at the upper end of the pull rod 330. The outer wall of the conical block 350 is an inclined surface with an inclination angle of 30°-45° to facilitate the radial expansion of the tensioning strip 320. Multiple tension bars 320 are fixed to the upper end of the rotating cylinder 310 by bolts. The tension bars 320 are evenly distributed along the circumference of the rotating cylinder 310. The inner side of the tension bars 320 is in contact with the inclined surface of the conical block 350. The tension bars 320 are made of elastic steel and have a certain elastic recovery ability. When the conical block 350 moves up and down, it can drive the tension bars 320 to expand or contract radially, thereby achieving tensioning and positioning of the inner hole of the hub 200.

[0026] To further improve the positioning stability of the wheel hub 200, the device also includes a support mechanism 700. The support mechanism 700 includes a mounting plate 720, which is fitted onto the outer wall of the rotating cylinder 310 with an interference fit to ensure that the mounting plate 720 can rotate synchronously with the rotating cylinder 310. The upper end of the mounting plate 720 is fixed with a support plate 710 by four evenly distributed bolts. The upper end face of the support plate 710 is in contact with the lower end face of the wheel hub 200 to provide bottom support for the wheel hub 200 and prevent the wheel hub 200 from axially shaking during the testing process. The upper end of the support plate 710 is also equipped with four inserts 730. The inserts 730 are fixed to the upper end of the support plate 710 by means of a threaded structure. The upper end of the support plate 710 is provided with corresponding threaded grooves. The position of the inserts 730 can be adjusted according to different models of wheel hubs 200 to meet the usage requirements. The inserts 730 are evenly distributed along the circumference of the support plate 710 and correspond one-to-one with the mounting holes on the wheel hub 200. After being inserted into the mounting holes of the wheel hub 200, the circumferential rotation of the wheel hub 200 can be further restricted to ensure the accuracy of positioning.

[0027] It also includes a detection component 400, which is used to detect the radius and outer roundness of the wheel hub 200. The detection component 400 includes a fixing frame 410, which is fixed to the upper end of the detection table 100 by expansion bolts. An electric push rod 411 and a laser emitter 412 are respectively installed on the fixing frame 410. The electric push rod 411 is a servo electric push rod, which can realize precise extension and retraction control. The laser emitter 412 is an infrared laser emitter, and the emitted laser beam has good directionality and stability, which is convenient for accurate detection.

[0028] The output end of the electric actuator 411 is connected to a movable component 417. The movable component 417 includes a sleeve 4171, which is fixed to the mounting bracket 413 by bolts. A movable block 4173 is slidably connected inside the sleeve 4171, and the movable block 4173 slides against the inner wall of the sleeve 4171. A spring 4172 is fixed to one end of the movable block 4173, and the other end of the spring 4172 is fixedly connected to the inner wall of the sleeve 4171. When the spring 4172 is in its natural state, the movable block 4173 is located within the sleeve 4171. Inside 171, a drive rod 4174 is also fixed on the moving block 4173. The drive rod 4174 is fixedly connected to the output end of the electric push rod 411 through a coupling. This structural design can make the detection roller 416 always closely fit with the outer wall of the hub 200 through the elastic action of the spring 4172, so as to avoid the detection roller 416 from disengaging from the hub 200 due to slight undulations on the outer circle of the hub 200, thus ensuring the continuity of detection data. At the same time, it also allows the detection roller 416 to move radially in the hub 200.

[0029] The other end of the mounting bracket 413 is rotatably connected to a detection roller 416. The detection roller 416 is made of wear-resistant rubber with a smooth surface to avoid scratching the outer wall of the hub 200. The axis of the detection roller 416 is parallel to the axis of the rotating cylinder 310, ensuring that the detection roller 416 can fully fit the outer circular surface of the hub 200. A slider 418 is fixed to the bottom of the mounting bracket 413. The bottom of the slider 418 is provided with a rail groove 4182. Two parallel guide rails 4181 are fixed to the upper end of the detection table 100. The rail groove 4182 on the slider 418 slides in cooperation with the guide rails 4181. The guide rails 4181 guide the movement of the mounting bracket 413, ensuring that the mounting bracket 413 moves smoothly in the horizontal direction and avoiding a decrease in detection accuracy due to the offset of the mounting bracket 413.

[0030] To ensure stable sliding of the drive rod 4174, a synchronizing block 419 is fixed on the drive rod 4174. The synchronizing block 419 is provided with a mating groove, and the guide rail 4181 passes through the mating groove and is slidably connected to it.

[0031] The upper end of the mounting frame 413 is fixed with a support frame 414 by bolts. A laser receiver 415 is installed on the support frame 414. The laser receiver 415 is set in correspondence with the laser emitter 412. The laser beam emitted by the laser emitter 412 can accurately irradiate the laser receiver 415. When the detection roller 416 moves with the undulation of the outer circle of the hub 200, it will drive the mounting frame 413, the support frame 414 and the laser receiver 415 to move synchronously. At this time, the laser signal received by the laser receiver 415 will change. By detecting the amount of change in the laser signal, the radius and outer circle deviation of the hub 200 can be calculated.

[0032] The liquid supply assembly 500 is used to drive the piston block 340 to move up and down, thereby driving the conical block 350 to move, realizing the tensioning bar 320 to tighten and loosen. It includes a fixed plate 510, which is fixed to the bottom of the test table 100 by bolts. A liquid storage part 520 is fixed on the fixed plate 510. The liquid storage part 520 is a piston-type liquid storage cylinder structure. The other end of the liquid storage part 520 is fixed on a movable plate 530. The movable plate 530 is located below the mounting frame 413 and moves synchronously with the mounting frame 413.

[0033] The testing platform 100 is provided with a sliding groove 110 running through its upper and lower parts. An L-shaped synchronization block 419 is slidably connected in the sliding groove 110. The upper end of the synchronization block 419 is fixed to the drive rod 4174 by bolts, and the lower end of the synchronization block 419 is connected to the upper end of the movable plate 530 by bolts. When the mounting frame 413 moves, it will drive the movable plate 530 to move synchronously through the synchronization block 419, thereby squeezing or stretching the liquid storage part 520. The liquid storage section 520 is connected to the rotating cylinder 310 via a delivery hose 540. A rotary joint 550 is installed at the bottom of the rotating cylinder 310. The delivery hose 540 is connected to the rotary joint 550 via a threaded joint. The rotary joint 550 is designed to prevent the delivery hose 540 from getting tangled when the rotating cylinder 310 rotates, ensuring smooth liquid delivery. The liquid storage section 520 is filled with hydraulic oil. When the movable plate 530 squeezes the liquid storage section 520, the hydraulic oil enters the rotating cylinder 310 through the delivery hose 540, pushing the piston block 340 upward. When the movable plate 530 stretches the liquid storage section 520, the hydraulic oil in the rotating cylinder 310 flows back to the liquid storage section 520, and the piston block 340 moves downward.

[0034] The drive assembly 600 is used to drive the rotating cylinder 310 to rotate, thereby driving the hub 200 to rotate synchronously, realizing the comprehensive inspection of the outer surface of the hub 200. It includes a frame 620, which is fixed to the bottom of the inspection table 100 by bolts. A motor 610 is installed on the frame 620. The motor 610 is a servo motor, which can realize precise speed control. The output end of the motor 610 is fixed to a first bevel gear 630 by a flat key. A second bevel gear 640 is fixed to the rotating cylinder 310 by a flat key. The first bevel gear 630 and the second bevel gear 640 mesh with each other. Through the transmission action of the bevel gears, the horizontal rotation of the motor 610 is converted into the vertical rotation of the rotating cylinder 310. The structure is compact and the transmission efficiency is high.

[0035] The specific testing process for the wheel hub 200 in this invention is as follows: The wheel hub 200 to be tested is placed on the support plate 710, and the four pins 730 on the support plate 710 are inserted into the mounting holes of the wheel hub 200 to achieve initial positioning of the wheel hub 200. At this time, the rotating cylinder 310 passes through the inner hole in the middle of the wheel hub 200. Then, the electric push rod 411 is activated, and the electric push rod 411 extends, pushing the drive rod 4174 and the moving block 4173 to move. The moving block 4173 drives the sleeve 4171 and the mounting bracket 413 to move along the guide rail 4181 towards the wheel hub 200. The synchronizing block 419 moves with the mounting bracket 413, thereby driving the movable plate 530. The hydraulic oil in the reservoir 520 is drawn into the reservoir 520 through the delivery hose 540 and rotary joint 550, thereby driving the piston block 340 to move downward. The piston block 340 drives the conical block 350 to move downward through the pull rod 330. The inclined surface of the conical block 350 squeezes the tensioning strip 320, causing the tensioning strip 320 to expand radially and fit tightly against the inner hole of the hub 200, achieving precise tensioning and positioning of the hub 200. At the same time, the detection roller 416 on the mounting bracket 413 fits tightly against the outer surface of the hub 200, and the spring 4172 is in a slightly compressed state, ensuring that the detection roller 416 fits tightly against the hub 200.

[0036] After positioning is completed, motor 610 is started, which drives the first bevel gear 630 to rotate. The first bevel gear 630 drives the second bevel gear 640 to rotate, which in turn drives the rotating cylinder 310, mounting plate 720, support plate 710 and hub 200 to rotate synchronously. During the rotation of hub 200, the detection roller 416 rotates synchronously. At the same time, laser emitter 412 is started, and laser emitter 412 emits a laser beam to laser receiver 415. When there are fluctuations in the outer circle of hub 200 (i.e., outer circle deviation), it will drive detection roller 416 to move horizontally left and right. Detection roller 416 drives mounting frame 413, support frame 414 and laser receiver 415 to move synchronously, causing the laser signal received by laser receiver 415 to deviate. By collecting and analyzing the deviation of the laser signal through an external controller (not shown), the outer circle deviation of hub 200 can be calculated, and it can be determined whether hub 200 meets the detection standard.

[0037] For radius detection, since the distance between the laser emitter 412 and the axis of the rotating cylinder 310 is fixed, let's call it L1. When the laser receiver 415 moves, the distance between the laser emitter 412 and the laser receiver 415 becomes L2. The radius of the hub 200 is R1, and the radius of the detection roller 416 is R2. Then, R1 = L1 - L2 - R2. This can be calculated automatically by a program. The only variable is L2. It should be noted that the axes of the laser emitter 412, the laser receiver 415, and the rotating cylinder 310 are collinear.

[0038] After the test is completed, the motor 610 and laser emitter 412 are turned off, the electric push rod 411 is controlled to retract, the electric push rod 411 drives the drive rod 4174 and the moving block 4173 to move in the opposite direction, the spring 4172 is reset, the mounting bracket 413 moves away from the hub 200 along the guide rail 4181, the synchronizing block 419 drives the movable plate 530 to move in the opposite direction, the liquid storage part 520 is compressed, the hydraulic oil in the liquid storage part 520 is squeezed into the rotating cylinder 310, thereby driving the piston block 340 to move upward, and then driving the conical block 350 to move upward. The tensioning bar 320 contracts under its own elasticity, releasing the tensioning positioning of the hub 200. Then the hub 200 that has completed the test is removed from the support plate 710, completing one test process. The device is reset and awaits the next test. Example

[0039] like Figure 11As shown, this embodiment differs from Embodiment 1 in that the liquid supply assembly 500 in this embodiment also includes a liquid storage tank 570. The liquid storage tank 570 is connected to the liquid storage section 520 through a liquid outlet pipe 560. A solenoid valve 561 is installed on the liquid outlet pipe 560, and a pressure sensor is installed in the liquid storage section 520. The pressure sensor is used to detect the pressure in the liquid storage section 520. The opening degree of the solenoid valve 561 controls the amount of liquid discharged from the liquid outlet pipe 560, and also ensures that the pressure in the liquid storage section 520 can meet the usage requirements.

[0040] When different sizes of wheel hubs 200 are inspected, for large wheel hubs, the inspection roller 416 first comes into contact with the wheel hub 200. At this time, the stretch of the liquid storage part 520 is very small. Therefore, the setting of the spring 4172 can ensure that the liquid storage part 520 continues to be stretched, and ensure that the cone block 350 can move down to expand the tension bar 320. For the small hub, after the liquid storage section 520 is stretched and the conical block 350 can move down to expand the tensioning bar 320, the conical block 350 is jammed, and the electric push rod 411 can no longer work. At this time, the solenoid valve 561 opens, and the liquid storage section 520 continues to stretch, which can draw the hydraulic oil in the liquid storage tank 570 into the liquid storage section 520 through the liquid outlet pipe 560, which can ensure that the device continues to work until the detection roller 416 abuts against the hub 200.

[0041] After the test is completed, the reservoir 520 is squeezed, which first resets the cone block 350. Then the solenoid valve 561 opens, squeezing the excess hydraulic oil into the reservoir 570.

[0042] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An automatic detection device for the rear wheel hub of an electric vehicle, comprising a detection platform (100), characterized in that, The testing platform (100) is rotatably connected to a positioning assembly (300) for positioning the hub (200). The positioning assembly includes a rotating cylinder (310) with a piston block (340) sliding inside. A pull rod (330) is fixed to the upper end of the piston block (340), and a conical block (350) is fixed to the upper end of the pull rod (330). A plurality of tensioning strips (320) that cooperate with the conical block (350) and can expand radially are fixed to the upper end of the rotating cylinder (310). It also includes a detection component (400), which includes an electric push rod (411), the output end of which is connected to a movable part (417), the other end of which is fixed to a mounting bracket (413), a detection roller (416) that rotates inside the mounting bracket (413) and abuts against the hub (200), a laser emitter (412) is provided above the electric push rod (411), and a laser receiver (415) is provided above the detection roller (416). It also includes a liquid supply assembly (500) and a drive assembly (600), the liquid supply assembly (500) being used to drive the movement of the piston block (340) and the drive assembly (600) being used to drive the rotating cylinder (310) to rotate; The liquid supply assembly (500) includes a movable plate (530) disposed below the mounting frame (413) and moving synchronously with the mounting frame (413). A fixed plate (510) is fixed to the bottom of the detection platform (100). A liquid storage part (520) is fixed on the fixed plate (510). The other end of the liquid storage part (520) is fixed on the movable plate (530). The liquid storage part (520) is connected to the rotating cylinder (310) through a delivery hose (540). The testing platform (100) is provided with a sliding groove (110) running through its upper and lower parts. An L-shaped synchronization block (419) is slidably connected in the sliding groove (110). The upper end of the synchronization block (419) is fixed on the drive rod (4174), and the lower end of the synchronization block (419) is connected to the upper end of the movable plate (530). When the electric push rod pushes the detection roller close to the hub, the synchronizing block drives the movable plate to stretch the liquid storage section, and the hydraulic oil is drawn out from the rotating cylinder, causing the piston block to move down. The conical block moves down, causing the tensioning strip to expand radially, automatically completing the tensioning and positioning of the inner hole of the hub.

2. The automatic detection device for the rear wheel hub of an electric vehicle according to claim 1, characterized in that, It also includes a support mechanism (700), which includes a mounting plate (720) that is fitted onto the outer wall of the rotating cylinder (310) and has an interference fit therewith. The upper end of the mounting plate (720) is fixed with a support plate (710) that supports the hub (200) by bolts. The upper end of the mounting plate (720) is equipped with four inserts (730) that are used in conjunction with the hub (200).

3. The automatic detection device for the rear wheel hub of an electric vehicle according to claim 1, characterized in that, The detection assembly (400) also includes a mounting bracket (410) fixed to the upper end of the detection stage (100), and the electric push rod (411) and the laser emitter (412) are both mounted on the mounting bracket (410).

4. The automatic detection device for the rear wheel hub of an electric vehicle according to claim 1, characterized in that, The detection assembly (400) also includes a slider (418) fixed to the bottom of the mounting bracket (413). The upper end of the detection stage (100) is fixed with two guide rails (4181), and the slider (418) slides on the guide rails (4181).

5. The automatic detection device for the rear wheel hub of an electric vehicle according to claim 1, characterized in that, The movable component (417) includes a sleeve (4171) fixed on the mounting bracket (413), a movable block (4173) slidably connected inside the sleeve (4171), a spring (4172) fixed at one end of the movable block (4173), the other end of the spring (4172) being fixedly connected to the inner wall of the sleeve (4171), and a drive rod (4174) fixed on the movable block (4173), the drive rod (4174) being fixedly connected to the output end of the electric push rod (411).

6. The automatic detection device for the rear wheel hub of an electric vehicle according to claim 1, characterized in that, The upper end of the mounting bracket (413) is fixed with a support frame (414), the laser receiver (415) is mounted on the support frame (414), and the laser emitter (412) is set in correspondence with the laser receiver (415).

7. The automatic detection device for the rear wheel hub of an electric vehicle according to claim 1, characterized in that, A rotary joint (550) is installed at the bottom of the rotating cylinder (310), and the delivery hose (540) is connected to the rotary joint (550) through a threaded joint.

8. The automatic detection device for the rear wheel hub of an electric vehicle according to claim 1, characterized in that, The drive assembly (600) includes a frame (620) fixed to the bottom of the testing table (100), a motor (610) mounted on the frame (620), a first bevel gear (630) fixed to the output end of the motor (610), and a second bevel gear (640) fixed on the rotating cylinder (310), the first bevel gear (630) meshing with the second bevel gear (640).

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