Electric centering and straightening device for automobile

Abstract

The embodiment of the utility model provides an automobile electric centering and straightening device which is used in cooperation with an automobile calibration system and comprises a front straightening device and a rear straightening device which are detachably arranged on the center line of the front axle and the center line of the rear axle of a calibrated automobile respectively, and each straightening device comprises an internal expansion device and moving trolleys on the two sides. The output ends on the two sides of the internal expanding device are symmetrical about the center line of the traveling crane, a sliding tray is slidably arranged on the moving trolley, and the center line of the sliding tray coincides with the center line of the front axle or the center line of the rear axle. After the automobile runs to the two straightening devices, the wheels are located on the sliding trays, and the output ends of the internal expanding devices push the wheels and the sliding trays to slide so that the automobile can be centered and straightened. According to the electric centering and straightening device for the automobile, due to the detachable design, the requirement of the whole equipment for a site is extremely low, the device can be disassembled and stored after calibration is completed, disassembly and assembly are convenient, cost is low, safety and reliability are achieved, and the device is suitable for the field of automobile detection equipment.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of automobile detection equipment, in particular to an automobile electric centering and aligning device. BACKGROUND

[0002] More and more cars are used in China, and the comfort and safety of car driving have also been paid attention to in recent years. Therefore, not only the headlamps of the car need to be detected, but also the components such as laser radar and camera of the car need to be calibrated. During calibration, the vehicle must be centered and aligned relative to the target, and thus the demand for a centering and aligning device arises. At present, a large number of aligning devices on the market require fixed sites, and some also require to be placed below the ground level, which is not suitable for some users with tight sites, such as automobile repair shops and automobile 4S stores; in addition, the cost of the current aligning devices is very high whether they are pneumatic or electric, which is not suitable for mass promotion in the automobile aftermarket. SUMMARY

[0003] In order to solve one of the above technical defects, an automobile electric centering and aligning device is provided in the embodiments of the present application, which comprises:

[0004] A maintenance work station is arranged in front of a calibration system device, and a driving center line, a front axle center line and a rear axle center line corresponding to the calibration automobile are arranged on the ground of the maintenance work station;

[0005] Two sets of inner expansion devices are respectively detachably mounted at the front axle center line and the rear axle center line;

[0006] Four sets of moving trolleys are respectively detachably mounted on both sides of each set of inner expansion devices;

[0007] Each set of inner expansion devices has one output end on each side, and the two output ends of the inner expansion devices are symmetrical about the driving center line, and the moving path of the output end of the inner expansion device coincides with the front axle center line or the rear axle center line;

[0008] A sliding tray is slidably arranged on the moving trolley, the center line of the sliding tray coincides with the front axle center line or the rear axle center line, and the output end of the inner expansion device realizes the centering and aligning of the automobile by pushing the wheels and sliding the sliding tray.

[0009] Further, the inner expansion device comprises:

[0010] A base is detachably mounted on the ground of the maintenance work station;

[0011] A double-output speed reducer is mounted at the middle position of the base;

[0012] A motor assembly is connected with the input shaft of the double-output speed reducer through a first coupling;

[0013] The first bearing seat and the second bearing seat are sequentially and spacedly arranged on one side of the double-output speed reducer from inside to outside on the base;

[0014] The screw rod is rotatably connected with the first bearing seat and the second bearing seat at two ends thereof, and one end of the screw rod is connected with the output shaft of the double-output speed reducer through the second coupling after penetrating through the first bearing seat;

[0015] The nut is rotatably sleeved on the screw rod, and the positioning plate is connected to the nut;

[0016] The two guide rods are respectively arranged on two sides of the screw rod on the second bearing seat, one end of each guide rod is connected with the positioning plate, and the other end of each guide rod is connected with the nylon push block after penetrating through the guide sleeve, and the nylon push block is an output end of the inner expansion device.

[0017] Further, the moving trolley comprises:

[0018] The bottom plate is detachably installed on the ground of the maintenance station;

[0019] The two straight linear guides are symmetrically arranged on the bottom plate about the front axle center line or the rear axle center line;

[0020] The sliding tray is in an M shape, and two sides of the sliding tray upwardly arched are slidably lapped on the straight linear guides;

[0021] The universal ball bearing is arranged between the middle part of the sliding tray downwardly recessed and the bottom plate with a gap, the base of the universal ball bearing is installed on the lower surface of the sliding tray, and the spherical surface of the universal ball bearing is slidably connected with the bottom plate.

[0022] Further, the corresponding positions of the ground of the maintenance station are pre-buried with the positioning sleeves, the inner expansion device and the bottom part of the moving trolley are respectively provided with the positioning pin shafts, and the inner expansion device and the moving trolley are detachably installed on the ground of the maintenance station through the positioning pin shafts.

[0023] Further, the automobile rear axle center line is provided with a plurality of automobile rear axle center lines, and correspondingly, the pre-buried positioning sleeves at the automobile rear axle center lines are also provided with a plurality of groups.

[0024] Further, the moving trolley further comprises:

[0025] The slope is arranged on two sides of the sliding tray, and the slope is hingedly connected with the sliding tray.

[0026] Further, the moving trolley further comprises:

[0027] The gas spring is hingedly connected with the sliding tray and the slope at two ends thereof, and the slope is lifted off the ground by the gas spring without load.

[0028] Further, the motor assembly is a direct current motor, and the power input end of the direct current motor is externally connected with a lithium battery.

[0029] Further, the bottom plate is provided with a handle on each side.

[0030] The automobile electric centering and aligning device provided in the embodiment of the application splits the originally huge aligning equipment into an inner expansion device and a moving trolley, greatly reducing the cost of the equipment and the cost of the site, and only needs to install the inner expansion device and the moving trolley to the corresponding positions before calibration, and can be disassembled after calibration is completed. Not only is the requirement for the site extremely small, but also the disassembled inner expansion device and moving trolley can be placed in a very small space for storage, achieving the maximum space utilization, and being suitable for users in various sites with tight space.

[0031] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present application. The objects and other advantages of the present application can be realized and attained by means of the instrumentalities particularly pointed out in the written description and claims hereof as well as the appended drawings. BRIEF DESCRIPTION OF DRAWINGS

[0032] The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the present application and serve to explain the present application. In the drawings:

[0033] Figure 1 A structural schematic diagram of the automobile electric centering and aligning device provided in the embodiment of the application;

[0034] Figure 2 A perspective view of the inner expansion device provided in the embodiment of the application;

[0035] Figure 3 A top view of the inner expansion device provided in the embodiment of the application;

[0036] Figure 4 A side view of the inner expansion device provided in the embodiment of the application;

[0037] Figure 5 A perspective view of the moving trolley provided in the embodiment of the application;

[0038] Figure 6 A top view of the moving trolley provided in the embodiment of the application;

[0039] Figure 7 A sectional view of the moving trolley provided in the embodiment of the application;

[0040] Figure 8 A side view of the moving trolley on the slope without load provided in the embodiment of the application;

[0041] Figure 9 A side view of the ramp-loaded moving trolley provided in an embodiment of this application;

[0042] Among them, 10 is the car, 101 is the wheel, 20 is the internal expansion device, 201 is the base, 202 is the dual-output reducer, 203 is the motor assembly, 204 is the first coupling, 205 is the bearing seat, 206 is the second bearing seat, 207 is the lead screw, 208 is the second coupling, 209 is the nut, 210 is the positioning plate, 211 is the guide rod, 212 is the guide sleeve, 213 is the nylon push block, 30 is the moving trolley, 301 is the base plate, 302 is the linear guide rail, 303 is the sliding tray, 304 is the universal ball bearing, 305 is the ramp, 306 is the gas spring, 307 is the handle, 40 is the positioning sleeve, and 50 is the positioning pin. Detailed Implementation

[0043] To make the technical solutions and advantages in the embodiments of this application clearer, the following description is provided in conjunction with the appendix. Figures 1-9 The exemplary embodiments of this application will be described in further detail below. Obviously, the described embodiments are only a part of the embodiments of this application, and not an exhaustive list of all embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.

[0044] In the process of developing this application, the inventors discovered that with the increasing number of cars in China, the comfort and safety of driving have also gained significant attention in recent years. This necessitates not only testing car headlights but also calibrating components such as lidar and cameras. During calibration, the vehicle must be aligned with a target, thus creating a demand for alignment devices. Currently, many alignment devices on the market require a fixed location, and some even need to be placed below ground level, making them unsuitable for users with limited space, such as auto repair shops and 4S dealerships. Furthermore, current alignment devices, whether pneumatic or electric, are very expensive, making them unsuitable for large-scale promotion in the automotive aftermarket.

[0045] To address the aforementioned problems, this application provides an electric vehicle centering and alignment device for use in conjunction with a vehicle calibration system, comprising:

[0046] The maintenance bay is located in front of the calibration system equipment. The floor of the maintenance bay is marked with the driving center line, the front axle center line and the rear axle center line corresponding to the calibration vehicle 10.

[0047] Two sets of internal expansion devices 20 are detachably installed at the center line of the front axle and the center line of the rear axle, respectively;

[0048] Four sets of mobile trolleys 30, one set of mobile trolley 30 is detachably installed on each side of the inner expansion device 20, and the two sides of the mobile trolley 30 are approximately symmetrical about the center line of the vehicle (not strictly symmetrical);

[0049] There are one output on each side of the inner expansion device 20, and the two outputs of the inner expansion device 20 are symmetrical about the center line of the vehicle, and the moving path of the output of the inner expansion device 20 coincides with the center line of the front axle or the center line of the rear axle;

[0050] The sliding tray 303 is slidably arranged on the mobile trolley 30, and the center line of the sliding tray 303 coincides with the center line of the front axle or the center line of the rear axle, and the output of the inner expansion device 20 is realized by pushing the wheels 101 and sliding the sliding tray 303 to center the vehicle 10.

[0051] Specific implementation, as shown in Figure 1 ADAS calibration system, the following are the specific operation steps:

[0052] (1), draw the center line of the vehicle and the center line of the front axle on the ground of the ADAS maintenance station, and determine the center line of the rear axle according to the center line of the vehicle, the center line of the front axle and the wheelbase of the corresponding vehicle model;

[0053] (2), install the inner expansion device 20 at the center line of the front axle and the center line of the rear axle;

[0054] (3), install the mobile trolley 30 on the left and right sides of the inner expansion device 20;

[0055] (4), start the vehicle 10 and drive it into the maintenance station, and stop the four wheels 101 of the vehicle 10 in the corresponding sliding tray 303;

[0056] (5), start the front and rear inner expansion devices 20 at the same time, and the outputs of the inner expansion devices 20 on both sides move out by the same distance, driving the wheels 101 and the sliding tray 303 that are not aligned to slide until the vehicle 10 is centered and aligned;

[0057] (6), start calibration;

[0058] (7), after calibration, start the inner expansion device 20 in reverse to return the output to the starting position, and wait for the next vehicle 10 to be calibrated;

[0059] (8), determine whether there is a vehicle 10 to be calibrated, if yes, repeat steps (4) to (7) until all vehicles 10 to be calibrated are calibrated, if not, go to the next step;

[0060] (9), disassemble the inner expansion device 20 and the mobile trolley 30 from the maintenance station and place them in the corresponding storage position.

[0061] The automobile electric centering and aligning device provided by the embodiment of the application splits the originally huge aligning equipment into an inner expanding device and a moving trolley, greatly reduces the cost of the equipment and the cost of the site, and uses the detachable inner expanding device and the moving trolley to release the fixed site required by the traditional automobile calibration, so that the automobile calibration can be quickly installed on the ground of a maintenance work station when automobile calibration is needed, and the site is released after the automobile calibration is completed. The inner expanding device and the moving trolley can be stored in a very small space after being detached, the space is used to the greatest extent, and the automobile repair shop, the automobile 4S shop and other places where the site is tight are very suitable.

[0062] As a preferred scheme, as shown in Figures 2-4 The inner expanding device 20 comprises:

[0063] The base 201 is detachably installed on the ground of the maintenance work station;

[0064] The double-output speed reducer 202 is installed at the middle position of the base 201;

[0065] The motor assembly 203 is connected with the input shaft of the double-output speed reducer 202 through the first coupling 204;

[0066] The first bearing seat 205 and the second bearing seat 206 are sequentially and spacedly arranged on one side of the double-output speed reducer 202 on the base 201 from inside to outside;

[0067] The lead screw 207 is rotatably connected with the first bearing seat 205 and the second bearing seat 206 at both ends thereof, and one end of the lead screw 207 is connected with the output shaft of the double-output speed reducer 202 through the second coupling 208 after penetrating through the first bearing seat 205;

[0068] The nut 209 is rotatably sleeved on the lead screw 207, and the positioning plate 210 is connected on the nut 209;

[0069] The two guide rods 211 are respectively arranged with the guide sleeves 212 on the two sides of the lead screw 207 on the second bearing seat 206, one end of the guide rod 211 is connected with the positioning plate 210, the other end of the guide rod 211 is connected with the nylon push block 213 after penetrating through the guide sleeve 212, and the nylon push block 213 is the output end of the inner expanding device 20.

[0070] In specific implementation, the motor assembly 203 is started, the double-output speed reducer 202 converts the single-shaft output of the motor assembly 203 into double-shaft output, and converts the rotary motion from the output shaft of the double-output speed reducer 202 into linear motion by using the screw-nut mechanism, so that the nylon push block 213 is pushed outward; the double-output speed reducer 202 uniformly distributes the power of the motor assembly 203 to the two output shafts of the double-output speed reducer 202, so that the two output shafts rotate at the same speed and in different directions, ensuring that the two nylon push blocks 213 can simultaneously move towards each other by the same displacement, thereby achieving the purpose of aligning the automobile 10 and completing the preparation before the automobile calibration; the push block made of nylon can minimize the damage to the automobile tire 101 when it is pushed.

[0071] As a preferred solution, as shown in Figures 5-9 The mobile trolley 30 comprises:

[0072] The bottom plate 301 is detachably installed on the ground of the maintenance work station;

[0073] The two straight-line guides 302 are arranged on the bottom plate 301, and the two straight-line guides 302 are symmetrical about the front shaft center line or the rear shaft center line;

[0074] The sliding tray 303 is in the shape of M, and the two sides of the sliding tray 303 that are arched upward are respectively slidably lapped on the straight-line guides 302;

[0075] The universal ball bearing 304 is installed on the lower surface of the sliding tray 303, and the spherical surface of the universal ball bearing 304 is slidably connected with the bottom plate 301.

[0076] In specific implementation, when the automobile 10 drives into the maintenance work station, the four wheels 101 respectively drive into the four sliding trays 303, and the M-shaped sliding tray 303 can make the wheels 101 be clamped into the downwardly recessed middle part, thereby completing the preparation before alignment; the universal ball bearing 304 reduces the frictional resistance when the sliding tray 303 slides, so that the automobile can be easily corrected in the direction perpendicular to the straight-line guide 302, and the damage to the tire is reduced; the straight-line guide 302 is responsible for guiding the sliding, and ensures that the four wheels 101 can only be aligned to the calibrated position under the action of the nylon push block 213.

[0077] As a preferred solution, the positioning sleeve 40 is pre-buried in the corresponding position on the ground of the maintenance work station, the inner expansion device 20 and the bottom of the mobile trolley 30 are respectively provided with the positioning pin shaft 50, and the inner expansion device 20 and the mobile trolley 30 are detachably installed on the ground of the maintenance work station by the positioning pin shaft 50.

[0078] In implementation, the installation position of the positioning sleeve 40 on the ground of the maintenance station, the installation position of the positioning pin shaft 50 on the bottom of the inner expansion device 20 or the moving trolley 30, the inner expansion device 20 being able to be at the front axle center line or the rear axle center line, the two nylon push blocks 213 being symmetrical about the center line of the crane, the two moving trolleys 30 being symmetrical about the center line of the crane, and the center line of the sliding tray 303 coinciding with the front axle center line or the rear axle center line are used as the reference.

[0079] As a preferred solution, a plurality of automobile rear axle center lines are provided, and correspondingly, a plurality of sets of the positioning sleeve 40 pre-buried at the automobile rear axle center lines are provided.

[0080] In implementation, the center line of the crane, the front axle center line are used as the reference, a plurality of different rear axle center lines are determined according to the wheelbase of different automobile models, and the inner expansion device 20 and the moving trolley 30 of the rear wheel are installed at the rear axle center line position corresponding to the automobile model before the automobile is calibrated. The automobile electrically-centered and aligned device provided in the application can adjust the installation position of the inner expansion device and the moving trolley at the rear axle center line according to different automobile models, so that the automobile electrically-centered and aligned device can calibrate automobiles with different wheelbases, and the application range is expanded.

[0081] As a preferred solution, the moving trolley 30 further comprises:

[0082] The slope 305 is arranged on the two sides of the sliding tray 303, and the slope 305 is hinged to the sliding tray 303.

[0083] As a preferred solution, the moving trolley further comprises:

[0084] The gas spring 306 is hinged to the sliding tray 303 and the slope 305 at two ends respectively, and the slope 305 is lifted off the ground by the gas spring 306 without load.

[0085] In implementation, when the automobile 10 drives into or out of the moving trolley 30, a slope 305 is needed as a buffer to reduce the damage to the tire to the greatest extent. However, the additional slope 305 needs to be arranged in advance before calibration, and after calibration is completed, the slope 305 also needs to be removed in order to restore the site to be flat. If the slope 305 is directly fixed to the sliding tray 303, when the sliding tray 303 needs to slide, the bottom of the slope 305 will rub against the ground, which will additionally increase the energy required to align the automobile. In order to solve the above problems at the same time, the slope 305 is hinged to the two sides of the sliding tray 303, and the gas spring 306 is used for connection. When the automobile wheel 101 contacts the slope 305, the gas spring 306 is compressed, and the slope 305 is lifted off the ground. When the automobile 10 drives out of the moving trolley 30, the gas spring 306 is decompressed, and the slope 305 is lowered to the ground. Figure 9As shown, the gas spring 306 is contracted under pressure, the ramp 305 is lowered, the wheel 101 enters the sliding tray 303 or the ground after passing through the ramp 305, and the gas spring 306 returns to the initial state after the wheel 101 enters the sliding tray 303. Figure 8 As shown, the ramp 305 is lifted away from the ground, and does not affect the movement of the sliding tray 303 in the subsequent calibration process.

[0086] As a preferred scheme, the motor assembly 203 is a direct current motor, and a lithium battery is connected to the power input end of the direct current motor, so that the lithium battery and the direct current motor are used to ensure convenient and fast operation.

[0087] As a preferred scheme, the bottom plate 301 is provided with a handle 307 on each side, and the base 201 can also be provided with a handle on each side, so that the inner expansion device 20 or the mobile trolley 30 can be placed down and lifted during installation and disassembly, and the convenience of the inner expansion device 20 or the mobile trolley 30 during disassembly is further improved, and the time required for disassembly is reduced.

[0088] The automobile electric centering and alignment device provided by the application creatively divides the originally large alignment equipment into an inner expansion device and a mobile trolley, greatly reduces the cost of the equipment and the cost of the site, and only needs to be installed at a corresponding position before calibration and disassembled after calibration. Not only is the requirement for the site extremely small, but also a flat free space can be left after disassembly, the inner expansion device and the mobile trolley after disassembly can also be placed in a very small space for storage, the space utilization rate is maximized, and the device is suitable for users in various sites with tight space; different rear axle center lines are arranged for different wheelbase automobiles, so that the automobile electric centering and alignment device can calibrate automobiles of various models, and the application range of the device is greatly expanded; the inner expansion device adopts a double-output speed reducer and cooperates with a screw-nut mechanism to ensure that the nylon push blocks on both sides move the same displacement; the mobile trolley adopts a universal ball bearing to reduce the frictional resistance of the automobile relative to the ground; and the mobile trolley adopts a ramp and a gas spring to simultaneously solve the problems of wheel transition and ramp friction. The automobile electric centering and alignment device provided by the application is convenient to disassemble and assemble, low in cost, safe and reliable, and has strong practicability.

[0089] In the description of the application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application.

[0090] Furthermore, the terms "first", "second", etc. are used herein for descriptive purposes only and are not to be construed as indicating or implying relative importance or an ordered sequence. Thus, features defined with "first", "second" etc. can explicitly or implicitly include one or more of the features. In the description of the application, the meaning of "a plurality" is at least two, for example, two, three or more, unless expressly specified and limited otherwise.

[0091] In the present application, unless otherwise expressly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection or can communicate with each other; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0092] Although the preferred embodiments of the present application have been described, those skilled in the art can make further changes and modifications to these embodiments once they know the basic inventive concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0093] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application also intends to include these modifications and variations.

Claims

1. An electric alignment and centering device for automobiles, used in conjunction with an automobile calibration system, characterized in that: include: The maintenance station is located in front of the calibration system equipment. The maintenance station floor is provided with the driving center line, front axle center line and rear axle center line corresponding to the calibration vehicle (10). Two sets of internal expansion devices (20) are detachably installed at the center line of the front axle and the center line of the rear axle, respectively; Four sets of mobile trolleys (30), one set of mobile trolleys (30) is detachably installed on each side of the inner expansion device (20); The inner expansion device (20) has an output end on each side. The two output ends of the inner expansion device (20) are symmetrical about the driving center line. The moving path of the output end of the inner expansion device (20) coincides with the front axle center line or the rear axle center line. The mobile trolley (30) is slidably provided with a sliding tray (303), the center line of the sliding tray (303) coincides with the center line of the front axle or the center line of the rear axle, and the output end of the inner expansion device (20) realizes the centering and alignment of the car (10) by pushing the wheels (101) and the sliding tray (303) to slide.

2. The electric alignment and centering device for automobiles according to claim 1, characterized in that, The internal expansion device (20) includes: The base (201) is detachably mounted on the floor of the maintenance station; A dual-output reducer (202) is installed in the middle of the base (201); The motor assembly (203) has its output shaft connected to the input shaft of the dual-output reducer (202) via a first coupling (204); The first bearing housing (205) and the second bearing housing (206) are arranged sequentially from the inside to the outside on one side of the dual-output reducer (202) on the base (201); The lead screw (207) is rotatably connected at both ends to the first bearing housing (205) and the second bearing housing (206) respectively. One end of the lead screw (207) passes through the first bearing housing (205) and is connected to the output shaft of the dual output reducer (202) through the second coupling (208). A nut (209) is rotatably sleeved on the lead screw (207), and a positioning plate (210) is connected to the nut (209); Two guide rods (211) are provided on both sides of the lead screw (207) on the second bearing seat (206). One end of the guide rod (211) is connected to the positioning plate (210), and the other end of the guide rod (211) passes through the guide sleeve (212) and is connected to a nylon push block (213). The nylon push block (213) is the output end of the inner expansion device (20).

3. The electric alignment and centering device for automobiles according to claim 1, characterized in that, The mobile trolley (30) includes: The base plate (301) is detachably installed on the floor of the maintenance station; Two linear guide rails (302) are disposed on the base plate (301), and the two linear guide rails (302) are symmetrical about the center line of the front axle or the center line of the rear axle; The sliding tray (303) is M-shaped, and the two sides of the upward arched sliding tray (303) are slidably attached to the linear guide rail (302); The universal ball bearing (304) has a gap between the recessed middle part of the sliding tray (303) and the base plate (301). The base of the universal ball bearing (304) is installed on the lower surface of the sliding tray (303), and the spherical surface of the universal ball bearing (304) is slidably connected to the base plate (301).

4. The electric alignment and centering device for automobiles according to claim 1, characterized in that, Positioning sleeves (40) are pre-embedded at corresponding positions on the ground of the maintenance station. Positioning pins (50) are respectively installed at the bottom of the inner expansion device (20) and the mobile trolley (30). The inner expansion device (20) and the mobile trolley (30) are detachably installed on the ground of the maintenance station through the positioning pins (50).

5. The electric alignment and centering device for automobiles according to claim 4, characterized in that, The vehicle rear axle centerline is provided with multiple lines, and correspondingly, multiple sets of positioning sleeves (40) are also provided at the vehicle rear axle centerline.

6. The electric alignment and centering device for automobiles according to claim 3, characterized in that, The mobile trolley (30) also includes: A ramp (305) is provided on both sides of the sliding tray (303), and the ramp (305) is hinged to the sliding tray (303).

7. The electric alignment and centering device for automobiles according to claim 6, characterized in that, The mobile vehicle also includes: A gas spring (306) is provided, with its two ends hinged to the sliding tray (303) and the ramp (305) respectively. The ramp (305) is lifted off the ground by the gas spring (306) when it is unloaded.

8. The electric alignment and centering device for automobiles according to claim 2, characterized in that, The motor assembly (203) is a DC motor, and the power input terminal of the DC motor is connected to a lithium battery.

9. The electric alignment and centering device for automobiles according to claim 3, characterized in that, Handles (307) are installed on both sides of the base plate (301).

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