Four-degree-of-freedom automobile exhibition stand

Abstract

The invention relates to the technical field of automobile exhibition stands, in particular to a four-degree-of-freedom automobile exhibition stand which comprises a rotating platform, a lifting mechanism base, a lifting mechanism and an automobile, the rotating platform can rotate by any angle in the circumferential direction, and the lifting mechanism base is fixedly connected to the middle of the top end of the rotating platform; four lifting mechanisms are symmetrically arranged on the front side and the rear side of the top end of the lifting mechanism base left and right, four wheels of the automobile are placed at the top ends of the four lifting mechanisms correspondingly, and the automobile exhibition stand can exhibit details of an automobile chassis and a suspension system and can achieve four-degree-of-freedom exhibition at the same time.

Description

Technical Field

[0001] The invention relates to the technical field of automobile exhibition stands, and in particular to a four-degree-of-freedom automobile exhibition stand. Background Art

[0002] At present, automobile display platforms are usually based on conventional ground and are simply decorated as vehicle exhibition stands. This kind of display of vehicles parked on the ground cannot reflect the chassis details and suspension system of the vehicle. Summary of the invention

[0003] The purpose of the present invention is to provide a four-degree-of-freedom automobile exhibition stand to solve the technical problems existing in the above-mentioned background technology.

[0004] To achieve the above object, the technical solution of the present invention is as follows:

[0005] A four-degree-of-freedom automobile exhibition stand comprises: a rotating platform, a lifting mechanism base, a lifting mechanism and a car. The rotating platform can rotate circumferentially at any angle. The lifting mechanism base is fixedly connected to the middle of the top of the rotating platform. Four lifting mechanisms are symmetrically arranged on the front and rear sides of the top of the lifting mechanism base. The four wheels of the car are respectively placed on the tops of the four lifting mechanisms.

[0006] Furthermore, the rotating platform includes: a rotating platform base, a rotating platform turntable and a rotating mechanism. The rotating platform turntable is arranged directly above the rotating platform base, and a rotating mechanism for driving the rotating platform turntable to rotate circumferentially is arranged between the rotating platform turntable and the rotating platform base.

[0007] Furthermore, the rotating mechanism includes: a slewing bearing, a slewing pinion, a worm gear reducer and a servo motor, the outer ring of the slewing bearing is fixedly connected to the middle of the rotating platform base, the top of the inner ring of the slewing bearing is fixedly connected to the middle of the bottom end of the rotating platform, the inner wall of the inner ring of the slewing bearing engages with the slewing pinion, the slewing pinion is fixedly installed at the output end of the worm gear reducer, the input end of the worm gear reducer is connected to the output end of the servo motor, and the worm gear reducer is fixedly installed on one side of the top of the rotating platform base close to the center position.

[0008] Furthermore, the rotating platform also includes: a universal wheel, which is provided in a plurality of numbers, and the plurality of universal wheels are distributed in a circular array and are respectively fixedly installed on one side of the bottom end of the rotating platform rotating table close to the outer end, and the plurality of universal wheels are respectively rollingly connected to the top end of the rotating platform base.

[0009] Furthermore, the lifting mechanism base is rectangular, and four lifting mechanisms are fixedly installed at the four corners of the lifting mechanism base.

[0010] Furthermore, the lifting mechanism includes: a fixed base, a mounting bracket, an X-shaped lifting assembly, a lifting base, a linear guide and a wheel fixed base, the fixed base is in a Japanese-shaped frame structure, the mounting bracket is an angle steel, the front and rear sides of the fixed base are symmetrically fixedly connected with two mounting brackets on opposite sides, the bottom ends of the two mounting brackets are respectively detachably fixedly connected to the top of the lifting mechanism base, an X-shaped lifting assembly is arranged on the top of the X-shaped lifting assembly is arranged on the top of the X-shaped lifting assembly, two linear guides are symmetrically arranged on the left and right, a wheel fixed base is arranged directly above the lifting base, and the lifting base and the wheel fixed base are longitudinally limited and slidably connected by two linear guides.

[0011] Furthermore, the X-shaped lifting assembly includes: a lifting arm, an articulated pin, a lifting connection seat, a lifting wheel shaft, a lifting roller, a roller track, a lifting pin, a servo electric cylinder, an electric cylinder mounting seat, a mounting base and a lifting arm connecting shaft. The lifting arms are provided with four, and the four lifting arms are symmetrically arranged in pairs in front and back, and the two lifting arms on the same side of the front and back are cross-arranged in an X shape. The middle parts of the four lifting arms are respectively penetrated and hinged with the front and rear ends of the articulated pin, and the right ends of the four lifting arms are hinged with lifting connection seats. The four lifting connection seats are respectively fixedly mounted on the front and rear sides of the middle part of the top of the fixed base and the front and rear sides of the right part of the bottom end of the lifting base. The left ends of the four lifting arms are passed through the lifting wheel The shaft is rotatably connected to a lifting roller, and four roller tracks are symmetrically arranged on the front and rear of the left side of the top of the fixed base and the front and rear of the left side of the bottom of the lifting base. The four lifting rollers are respectively connected to the four roller tracks by limiting rolling. The upper right part of the two lifting arms on the outer side of the four lifting arms is longitudinally penetrated and fixedly installed with a lifting pin shaft, the lifting pin shaft is hinged with the output end of the servo electric cylinder, and the fixed end of the servo electric cylinder is hinged with an electric cylinder mounting seat, the right side of the fixed base is fixedly connected with a mounting base plate, and the electric cylinder mounting seat is fixedly installed on the top of the mounting base plate; the upper left part of the two lifting arms on the inner side of the four lifting arms is longitudinally penetrated and fixedly installed with a lifting arm connecting shaft.

[0012] Furthermore, a transverse strip-shaped limiting groove is provided on the roller track, and the lifting wheel shaft passes through longitudinally and is movably arranged in the strip-shaped limiting groove.

[0013] Furthermore, a rectangular groove is provided at the top of the lifting base, and the linear guide rail includes: a linear slide rail and a slide seat, two slide seats are symmetrically arranged front and back, the bottom end of the linear slide rail is fixedly connected to the bottom end of the rectangular groove on the lifting base, and the two slide seats are respectively longitudinally slidably connected to the front and rear sides of the linear slide rail, the horizontal height of the bottom end surface of the slide seat is lower than the horizontal height of the top end of the rectangular groove, and the top ends of the two slide seats are respectively fixedly connected to the front and rear sides of the bottom end of the wheel fixing base.

[0014] Furthermore, the wheel fixing base includes: a rectangular frame, a longitudinal brace, a V-shaped bracket, a mounting base plate and a rope buckle. The two longitudinal braces are symmetrically arranged on the left and right sides, and the two longitudinal braces are symmetrically fixedly connected to the left and right sides of the inner wall of the rectangular frame. The two V-shaped brackets are symmetrically arranged front and back, and the left and right ends of the two V-shaped brackets are respectively fixedly connected to the inner walls of the two longitudinal braces on the opposite sides. The wheels of the car are placed on the two V-shaped brackets, and two mounting base plates are symmetrically fixedly connected on the left and right sides of the bottom end of the rectangular frame. The two mounting base plates are respectively fixedly connected to the four slides on the two linear guide rails, and four rope buckles are symmetrically arranged at the four corners of the top of the rectangular frame.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] By using the rotating platform in conjunction with the four lifting mechanisms, the vehicle can be displayed not only in the same place, but also in a 360° rotation. At the same time, the vehicle can be raised and lowered, tilted forward, backward, and sideways, which can more comprehensively display the vehicle's shape, chassis details, and suspension system. The X-shaped lifting assembly can make the initial height of the lifting mechanism low and occupy little space. The coordinated use of the four lifting mechanisms and the combination with the rotating platform can realize the four-degree-of-freedom motion display of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the present invention;

[0018] Figure 2 It is a schematic diagram of the structure of the present invention when no car is placed;

[0019] Figure 3 It is a front view of the rotating platform in the present invention;

[0020] Figure 4 This is a structural view of the rotating platform in the present invention after removing the rotating platform rotating table;

[0021] Figure 5 It is a structural schematic diagram of an X-shaped lifting assembly in the lifting mechanism of the present invention;

[0022] Figure 6 This is a structural view of the lifting mechanism of the present invention after removing the wheel fixing base;

[0023] Figure 7 It is a front view of the lifting mechanism in the present invention;

[0024] Figure 8 It is a structural schematic diagram of the lifting mechanism in the present invention.

[0025] The numbers in the accompanying drawings are: 1-rotating platform base, 2-rotating platform rotating table, 3-slewing bearing, 4-slewing pinion, 5-worm gear reducer, 6-universal wheel, 7-lifting mechanism base, 8-lifting mechanism, 801-fixed base, 802-mounting bracket, 803-lifting arm, 804-hinge pin, 805-lifting connecting seat, 806-lifting wheel shaft, 807-lifting roller, 808-roller track, 809-lifting pin, 810-servo electric cylinder, 811-electric cylinder mounting seat, 812-mounting base plate, 813-lifting arm connecting shaft, 814-lifting base, 815-linear slide rail, 816-slide seat, 817-wheel fixing base, 9-car. DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0027] See also Figures 1 to 8 As shown, a four-degree-of-freedom automobile exhibition stand includes: a rotating platform, a lifting mechanism base 7, a lifting mechanism 8 and a car 9. The rotating platform can rotate circumferentially at any angle. The lifting mechanism base 7 is fixedly connected to the middle of the top of the rotating platform. Four lifting mechanisms 8 are symmetrically arranged on the front and rear sides of the top of the lifting mechanism base 7. The four wheels of the car 9 are respectively placed on the tops of the four lifting mechanisms 8.

[0028] In this embodiment, the rotating platform includes: a rotating platform base 1, a rotating platform rotating table 2 and a rotating mechanism. The rotating platform rotating table 2 is arranged directly above the rotating platform base 1. A rotating mechanism for driving the rotating platform rotating table 2 to rotate circumferentially is arranged between the rotating platform rotating table 2 and the rotating platform base 1; the rotating mechanism includes: a slewing bearing 3, a rotating pinion 4, a worm gear reducer 5 and a servo motor. The outer ring of the slewing bearing 3 is fixedly connected to the middle of the rotating platform base 1, the top of the inner ring of the slewing bearing 3 is fixedly connected to the middle of the bottom end of the rotating platform rotating table 2, the inner wall of the inner ring of the slewing bearing 3 engages with the rotating pinion 4, the rotating pinion 4 is fixedly installed at the output end of the worm gear reducer 5, the input end of the worm gear reducer 5 is connected to the output end of the servo motor, and the worm gear reducer 5 is fixedly installed on one side of the top of the rotating platform base 1 near the center position; the worm gear reducer 5 is used to amplify the torque of the servo motor and reduce the speed of the servo motor. At the same time, there is a reduction ratio between the rotating pinion 4 and the slewing bearing 3, which can better amplify the torque of the servo motor; making the rotating platform more stable.

[0029] In this embodiment, the rotating platform also includes: universal wheels 6, a plurality of universal wheels 6 are provided, and the plurality of universal wheels 6 are distributed in a circular array and are respectively fixedly installed on one side of the bottom end of the rotating platform rotating table 2 close to the outer end, and the plurality of universal wheels 6 are respectively rollingly connected to the top of the rotating platform base 1. By providing the plurality of universal wheels 6, the rotating platform can be better assisted in supporting, so that the deformation of the platform is smaller and the stability of the platform is improved.

[0030] In this embodiment, the lifting mechanism base 7 is rectangular, and the four lifting mechanisms 8 are fixedly installed at the four corners of the lifting mechanism base 7 respectively; the lifting mechanism 8 includes: a fixed base 801, a mounting bracket 802, an X-shaped lifting component, a lifting base 814, a linear guide and a wheel fixed base 817, the fixed base 801 is a Japanese-shaped frame structure, the mounting bracket 802 is an angle steel, and the front and rear sides of the fixed base 801 are symmetrically fixedly connected to the opposite sides of two mounting brackets 802, and the bottom ends of the two mounting brackets 802 are detachably fixedly connected to the top of the lifting mechanism base 7, an X-shaped lifting component is provided at the top of the fixed base 801, and a lifting base 814 is provided at the top of the X-shaped lifting component. Two linear guides are symmetrically arranged on the left and right, and a wheel fixed base 817 is provided directly above the lifting base 814. The lifting base 814 and the wheel fixed base 817 are longitudinally limited and slidably connected through two linear guides.

[0031] The X-shaped lifting assembly includes: a lifting arm 803, a hinge pin 804, a lifting connection seat 805, a lifting wheel shaft 806, a lifting roller 807, a roller track 808, a lifting pin shaft 809, a servo electric cylinder 810, an electric cylinder mounting seat 811, a mounting base 812 and a lifting arm connecting shaft 813. There are four lifting arms 803, and the four lifting arms 803 are symmetrically arranged in pairs in front and back. The two lifting arms 803 on the same side of the front and back are cross-arranged in an X shape. The middle parts of the four lifting arms 803 are respectively penetrated and hinged with the front and rear ends of the hinge pin 804. The right ends of the four lifting arms 803 are hinged with lifting connection seats 805. The four lifting connection seats 805 are respectively fixedly mounted on the front and rear sides of the middle part of the top of the fixed base 801 and the front and rear sides of the right part of the bottom of the lifting base 814. The left ends of the four lifting arms 803 are rotatably connected to the lifting roller 807 through the lifting wheel shaft 806. Four roller tracks 808 are symmetrically arranged on the front and back of the left side of the end and the front and back of the left side of the bottom end of the lifting base 814, and the four lifting rollers 807 are respectively connected to the four roller tracks 808 in a limited rolling manner. The upper right part of the two lifting arms 803 on the outer side of the four lifting arms 803 is longitudinally penetrated and fixedly installed with a lifting pin shaft 809, and the lifting pin shaft 809 is hinged with the output end of the servo electric cylinder 810, and the fixed end of the servo electric cylinder 810 is hinged with an electric cylinder mounting seat 811, and the right side of the fixed base 801 is fixedly connected with a mounting base plate 812, and the electric cylinder mounting seat 811 is fixedly installed on the top of the mounting base plate 812; the upper left part of the two lifting arms 803 on the inner side of the four lifting arms 803 is longitudinally penetrated and fixedly installed with a lifting arm connecting shaft 813; the servo electric cylinder 810 is placed at an angle to lower the platform height, and the lifting roller 807 converts sliding friction into rolling friction to reduce the torque required for lifting, making the platform more labor-saving.

[0032] In this embodiment, a transverse strip-shaped limiting groove is provided on the roller track 808, and the lifting wheel shaft 806 passes through longitudinally and is movably arranged in the strip-shaped limiting groove. The provided strip-shaped limiting groove can prevent the lifting roller 808 from slipping off the roller track 808.

[0033] In this embodiment, a rectangular groove is provided at the top of the lifting base 814, and the linear guide includes: a linear slide rail 815 and a slide seat 816, two slide seats 816 are symmetrically arranged front and back, the bottom end of the linear slide rail 815 is fixedly connected to the bottom end of the rectangular groove on the lifting base 814, and the two slide seats 816 are respectively longitudinally slidably connected to the front and rear sides of the linear slide rail 815, the horizontal height of the bottom end surface of the slide seat 816 is lower than the horizontal height of the top end of the rectangular groove, and the top ends of the two slide seats 816 are respectively fixedly connected to the front and rear sides of the bottom end of the wheel fixing base 817; when the vehicle rolls, it is convenient for the wheel fixing base 817 to make sliding compensation.

[0034] In this embodiment, the wheel fixing base 817 includes: a rectangular frame, a longitudinal brace, a V-shaped bracket, a mounting base plate and a rope buckle. Two longitudinal braces are symmetrically arranged on the left and right sides, and the two longitudinal braces are symmetrically fixedly connected to the left and right sides of the inner wall of the rectangular frame. Two V-shaped brackets are symmetrically arranged front and back, and the left and right ends of the two V-shaped brackets are respectively fixedly connected to the inner walls of the two longitudinal braces on the opposite sides. The wheels of the automobile 9 are placed on the two V-shaped brackets, and two mounting base plates are symmetrically fixedly connected on the left and right sides of the bottom end of the rectangular frame. The two mounting base plates are respectively fixedly connected to the four slides 816 on the two linear guide rails. Four rope buckles are symmetrically arranged at the four corners of the top of the rectangular frame. After the wheels of the automobile 9 are placed on the two V-shaped brackets, a rope is passed through the four rope buckles and the wheel hubs to firmly fix the wheels on the wheel fixing base 817.

[0035] When the device is in use, the car 9 is lifted by a forklift or other lifting equipment, and the four wheels of the car are placed on the wheel fixing bases 817 at the top of the four lifting mechanisms 8, respectively, so that the wheels are close to the inner two end surfaces of the V-shaped bracket, and then the four wheels are respectively tied to the rope buckles on the four wheel fixing bases 817 by four ropes. When rotating display is required, it is only necessary to drive the servo motor, and the servo motor drives the rotating pinion 4 to rotate through the worm gear reducer 5, and the rotating pinion 4 drives the rotating bearing 3 and the rotating platform 2 at the top thereof to rotate, thereby driving the rotating platform 2 above it. Four lifting mechanisms and the automobile 9 are displayed in rotation; by controlling the extension and retraction of four servo electric cylinders 810 respectively, the lifting, forward tilt, backward tilt, and side tilt of the automobile 9 can be realized, so that the shape of the vehicle as well as the chassis details and the suspension system can be more comprehensively displayed; the set X-shaped lifting assembly can make the initial height of the lifting mechanism 8 low and occupy a small space; the four-degree-of-freedom motion display of the vehicle can be realized through the coordinated use of the four lifting mechanisms 8 and the combination with the rotating platform; when the vehicle is displayed sideways, sliding compensation of the wheel fixing base 817 is required, which can be achieved by the wheel fixing base 817 sliding along the linear guide rail.

[0036] In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "inside", "outside", "top / bottom" and the like indicate directions or positional relationships based on the directions 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 direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0037] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any technician familiar with the profession, without departing from the scope of the technical solution of the present invention, according to the technical essence of the present invention, any simple modification, equivalent replacement and improvement made to the above embodiment still falls within the protection scope of the technical solution of the present invention.

Claims

1. A four-degree-of-freedom automobile exhibition stand, characterized in that: include: A rotating platform, a lifting mechanism base (7), a lifting mechanism (8) and a car (9), wherein the rotating platform can rotate in a circumferential direction at any angle, the lifting mechanism base (7) is fixedly connected to the middle of the top of the rotating platform, four lifting mechanisms (8) are symmetrically arranged on the front and rear sides of the top of the lifting mechanism base (7), and the four wheels of the car (9) are respectively placed on the tops of the four lifting mechanisms (8).

2. A four-degree-of-freedom automobile exhibition stand according to claim 1, characterized in that: The rotating platform comprises: a rotating platform base (1), a rotating platform rotating table (2) and a rotating mechanism; the rotating platform rotating table (2) is arranged directly above the rotating platform base (1); and a rotating mechanism for driving the rotating platform rotating table (2) to rotate in a circumferential direction is arranged between the rotating platform rotating table (2) and the rotating platform base (1).

3. A four-degree-of-freedom automobile exhibition stand according to claim 2, characterized in that: The rotating mechanism comprises: a slewing bearing (3), a slewing pinion (4), a worm gear reducer (5) and a servo motor, wherein the outer ring of the slewing bearing (3) is fixedly connected to the middle of the rotating platform base (1), the top of the inner ring of the slewing bearing (3) is fixedly connected to the middle of the bottom end of the rotating platform rotating table (2), the inner wall of the inner ring of the slewing bearing (3) meshes with the slewing pinion (4), the slewing pinion (4) is fixedly mounted on the output end of the worm gear reducer (5), the input end of the worm gear reducer (5) is connected to the output end of the servo motor, and the worm gear reducer (5) is fixedly mounted on one side of the top of the rotating platform base (1) close to the center position.

4. A four-degree-of-freedom automobile exhibition stand according to claim 2 or 3, characterized in that: The rotating platform further comprises: a plurality of universal wheels (6), the plurality of universal wheels (6) being arranged in a circular array and respectively fixedly mounted on one side of the bottom end of the rotating platform rotating table (2) close to the outer end, and the plurality of universal wheels (6) being respectively rollingly connected to the top end of the rotating platform base (1).

5. The four-degree-of-freedom automobile exhibition stand according to claim 1, characterized in that: The lifting mechanism base (7) is rectangular, and four lifting mechanisms (8) are respectively fixedly mounted at the four corners of the lifting mechanism base (7).

6. A four-degree-of-freedom automobile exhibition stand according to claim 1 or 5, characterized in that: The lifting mechanism (8) comprises: a fixed base (801), a mounting bracket (802), an X-shaped lifting assembly, a lifting base (814), a linear guide rail and a wheel fixed base (817); the fixed base (801) is a Japanese-shaped frame structure; the mounting bracket (802) is an angle steel; two mounting brackets (802) are symmetrically fixedly connected to the front and rear sides of the fixed base (801) on the opposite sides; the bottom ends of the two mounting brackets (802) are respectively detachably fixedly connected to the top of the lifting mechanism base (7); an X-shaped lifting assembly is arranged at the top of the fixed base (801); a lifting base (814) is arranged at the top of the X-shaped lifting assembly; two linear guide rails are symmetrically arranged on the left and right; a wheel fixed base (817) is arranged directly above the lifting base (814); the lifting base (814) and the wheel fixed base (817) are longitudinally limited and slidably connected via two linear guide rails.

7. The four-degree-of-freedom automobile exhibition stand according to claim 6, characterized in that: The X-shaped lifting assembly comprises: a lifting arm (803), a hinge pin (804), a lifting connection seat (805), a lifting wheel shaft (806), a lifting roller (807), a roller track (808), a lifting pin shaft (809), a servo electric cylinder (810), an electric cylinder mounting seat (811), a mounting base (812) and a lifting arm connecting shaft (813). The lifting arms (803) are provided with four, and the four lifting arms (803) are symmetrically arranged in pairs in front and back. The two lifting arms (803) on the same side of the front and rear are arranged in an X-shaped cross arrangement. The middle parts of the four lifting arms (803) are respectively penetrated and hinged with the front and rear ends of the hinge pin shaft (804). The right ends of the four lifting arms (803) are hinged with lifting connection seats (805). The four lifting connection seats (805) are respectively fixedly installed on the front and rear sides of the middle part of the top of the fixed base (801) and the front and rear sides of the right part of the bottom of the lifting base (814). The left ends of the four lifting arms (803) are connected by lifting wheels. The shaft (806) is rotatably connected to a lifting roller (807), and four roller tracks (808) are symmetrically arranged at the front and rear of the left side of the top of the fixed base (801) and the front and rear of the left side of the bottom of the lifting base (814), respectively. The four lifting rollers (807) are respectively connected to the four roller tracks (808) in a limited rolling manner, and a lifting pin shaft (809) is longitudinally penetrated and fixedly installed on the upper right side of the two lifting arms (803) in the middle and outer sides of the four lifting arms (803). The lifting pin shaft (809) 809) is hingedly connected to the output end of a servo electric cylinder (810), the fixed end of the servo electric cylinder (810) is hingedly connected to an electric cylinder mounting seat (811), the right side of the fixed base (801) is fixedly connected to a mounting base plate (812), and the electric cylinder mounting seat (811) is fixedly mounted on the top of the mounting base plate (812); the upper left part of the two inner lifting arms (803) among the four lifting arms (803) is longitudinally penetrated and fixedly mounted with a lifting arm connecting shaft (813).

8. The four-degree-of-freedom automobile exhibition stand according to claim 7, characterized in that: The roller track (808) is provided with a transverse strip-shaped limiting groove, and the lifting wheel shaft (806) passes through longitudinally and is movably arranged in the strip-shaped limiting groove.

9. The four-degree-of-freedom automobile exhibition stand according to claim 6, characterized in that: A rectangular groove is provided at the top of the lifting base (814); the linear guide rail comprises: a linear slide rail (815) and a slide seat (816); two slide seats (816) are symmetrically arranged front and rear; the bottom end of the linear slide rail (815) is fixedly connected to the bottom end of the rectangular groove on the lifting base (814); the two slide seats (816) are respectively longitudinally slidably connected to the front and rear sides of the linear slide rail (815); the horizontal height of the bottom end surface of the slide seat (816) is lower than the horizontal height of the top end of the rectangular groove; the top ends of the two slide seats (816) are respectively fixedly connected to the front and rear sides of the bottom end of the wheel fixing base (817).

10. The four-degree-of-freedom automobile exhibition stand according to claim 9, characterized in that: The wheel fixing base (817) comprises: a rectangular frame, a longitudinal brace, a V-shaped bracket, a mounting base plate and a rope buckle. The longitudinal brace is symmetrically arranged with two longitudinal braces, and the two longitudinal braces are symmetrically fixedly connected to the left and right sides of the inner wall of the rectangular frame. The V-shaped bracket is symmetrically arranged with two V-shaped brackets, and the left and right ends of the two V-shaped brackets are respectively fixedly connected to the inner walls of the two longitudinal braces on the opposite sides. The wheels of the automobile (9) are placed on the two V-shaped brackets. The left and right sides of the bottom end of the rectangular frame are symmetrically fixedly connected to two mounting base plates, and the two mounting base plates are respectively fixedly connected to four slide seats (816) on the two linear guide rails. Four rope buckles are symmetrically arranged at the four corners of the top of the rectangular frame.

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