Folding jack for automobile maintenance

Abstract

The invention relates to the technical field of supporting equipment accessory devices, in particular to a folding type automobile maintenance jack which comprises a base and folding devices, the folding devices are evenly installed on the base, two first installation bases are arranged on the base, an opening and closing device penetrates through the first installation bases and is rotationally connected with the base, and a shaft hole is formed in the opening and closing device; the middle shaft device penetrates through the shaft hole and is rotationally connected with the opening and closing devices, the two supporting devices are evenly installed on the corresponding opening and closing devices, a second installation base is arranged on the lifting mechanism, and the adjusting device penetrates through the second installation base and is rotationally connected with the lifting mechanism. Equipment is stored and unfolded by folding the side plates and stretching and retracting the top cover, the supporting stability of the equipment is improved by adopting screw rod threads and triangular supporting modes, bolts are driven by a motor and an electric push rod to rotate for lifting and stretching and retracting, a tray is reinforced through threads of a center shaft in the lifting process, and the supporting stability of the equipment is improved. And violent lifting of the equipment during lifting is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of accessory devices for support equipment, and particularly to a folding vehicle repair jack. Background Art

[0002] When a vehicle breaks down and needs to be simply repaired or the tires replaced by the roadside, a jack can provide a safe working platform. Correct use of the jack can ensure that the vehicle is firmly lifted, avoiding injuries to maintenance personnel caused by sudden sinking of the vehicle. With the help of the jack, maintenance personnel can complete tasks such as tire replacement and chassis inspection in a shorter time, which is very valuable for vehicle owners in urgent need of resuming driving. Especially in emergencies, quick tire replacement can reduce the parking time and resume normal driving as soon as possible. An automotive jack is a manually or hydraulically operated mechanical device used to temporarily support a vehicle and lift one side of the vehicle off the ground. It is very useful when replacing tires, repairing and maintaining chassis components, or adjusting the suspension system; the most common existing vehicle repair jack is a screw cross-support jack, which is a device used for vehicle repair in daily life and has been widely used in the field of vehicle repair;

[0003] When the existing screw cross-support jack is in use, it is first placed under the vehicle, and by rotating the screw, the support arm connected thereto is driven to perform a scissor rotation, thereby driving the top support to lift the vehicle. It has been found in the use of the existing screw cross-support jack that the screw cross-support jack is mostly used for relatively small vehicles in terms of usage scenarios, and has poor lifting force for large vehicles such as SUVs. It is relatively difficult to carry a large jack, resulting in low working efficiency of the equipment.

[0004] Based on this, a folding vehicle repair jack is now provided, which can eliminate the drawbacks of the existing device. Summary of the Invention

[0005] In view of the above problems, the present invention provides a folding vehicle repair jack that can be easily carried by folding and improves the lifting force through double-screw lifting.

[0006] To solve the problems of the existing technology, the present invention provides a foldable automobile maintenance jack, which includes a base and a folding device. The folding device is evenly installed on the base. The folding device further includes an opening and closing device, a supporting device, a central axis device, a lifting mechanism and an adjusting device. Two groups of first mounting seats are arranged on the base. The opening and closing device passes through the first mounting seats and is rotatably connected to the base. An axis hole is arranged on the opening and closing device. The central axis device passes through the axis hole and is rotatably connected to the opening and closing device. Two groups of the supporting devices are evenly installed on the corresponding opening and closing devices. The connecting end of the lifting mechanism is connected to the connecting end of the corresponding opening and closing device. A second mounting seat is arranged on the lifting mechanism. The adjusting device passes through the second mounting seat and is rotatably connected to the lifting mechanism.

[0007] Preferably, the opening and closing device further includes side doors, a central disk, limiting rods, limiting sleeves, a top cover, a tray and lateral limiting columns. Two groups of the side doors respectively pass through the corresponding first mounting seats and are rotatably connected to the base. A through hole is arranged on the base. The central disk passes through the through hole and is fixedly sleeved with the base. The connecting ends of two groups of the limiting rods are both connected to the connecting end of the central disk. Limiting holes are arranged on the limiting sleeves. Two groups of the limiting rods respectively pass through the corresponding limiting holes and are slidably connected to the corresponding limiting sleeves. The connecting end of the tray is connected to the tops of two groups of the limiting sleeves. The connecting end of the top cover is connected to the top of the tray. The connecting ends of four groups of the lateral limiting columns are all connected to the bottom of the tray.

[0008] Preferably, the opening and closing device further includes side doors, a central disk, limiting rods, limiting sleeves, a top cover, a tray and lateral limiting columns. Two groups of the side doors respectively pass through the corresponding first mounting seats and are rotatably connected to the base. A through hole is arranged on the base. The central disk passes through the through hole and is fixedly sleeved with the base. The connecting ends of two groups of the limiting rods are both connected to the connecting end of the central disk. Limiting holes are arranged on the limiting sleeves. Two groups of the limiting rods respectively pass through the corresponding limiting holes and are slidably connected to the corresponding limiting sleeves. The connecting end of the tray is connected to the tops of two groups of the limiting sleeves. The connecting end of the top cover is connected to the top of the tray. The connecting ends of four groups of the lateral limiting columns are all connected to the bottom of the tray.

[0009] Preferably, the central axis device further includes a lead screw, a nut sleeve, positioning rods, connecting rods and arc rods. The connecting end of the nut sleeve is connected to the bottom of the tray. The lead screw passes through the axis hole and is rotatably connected to the central disk. The connecting ends of two groups of the positioning rods are both connected to the connecting end of the nut sleeve. A threaded hole is arranged in the nut sleeve. The lead screw passes through the threaded hole and is threadedly connected to the nut sleeve. Fourth mounting seats are arranged on both the positioning rods and the central disk. The arc rods and the connecting rods respectively pass through the corresponding fourth mounting seats and are rotatably connected to the positioning rods and the central disk. The connecting ends of the corresponding arc rods and connecting rods are hinged.

[0010] Preferably, the lifting mechanism further includes a driving motor, side plates, connecting shafts, adjusting blocks, turning knobs, gaskets, screw rods, sliding sleeves and supporting platforms. Two groups of the side plates are respectively connected to the connection ends of the corresponding side doors. Adjusting seats are arranged on both groups of the side plates. Two groups of the connecting shafts respectively pass through the corresponding adjusting seats and are rotatably connected to the corresponding side plates. Two groups of the gaskets are respectively provided with threaded holes through which the corresponding connecting shafts pass. Two groups of the turning knobs respectively pass through the corresponding threaded holes, are slidably connected to the corresponding gaskets and are threadedly connected to the corresponding connecting shafts. Four groups of the adjusting blocks are respectively fixedly sleeved on the corresponding connecting shafts. Hinge seats are arranged on all four groups of the adjusting blocks. Four groups of the corresponding sliding sleeves respectively pass through the corresponding hinge seats and are rotatably connected to the corresponding adjusting blocks. Through holes are arranged on all eight groups of the sliding sleeves. Four groups of the screw rods respectively pass through the corresponding through holes and are threadedly connected to the corresponding sliding sleeves. The connection end of the driving motor is connected to the connection end of the corresponding sliding sleeve. The output end of the driving motor passes through the through hole and is connected to the connection end of the screw rod. Four groups of the gaskets are respectively rotatably connected to the connection ends of the corresponding adjusting blocks. Two groups of the supporting platforms are respectively rotatably connected to the corresponding sliding sleeves. Card slots are arranged on both groups of the supporting platforms. Four groups of the gaskets respectively pass through the corresponding card slots and are rotatably connected to the corresponding supporting platforms.

[0011] Preferably, the adjusting device further includes a servo motor, guide rails, positioning bolts, positioning cards, gears and racks. Fixing seats are arranged on the side plates. The connection ends of two groups of the servo motors are respectively connected to the connection ends of the corresponding fixing seats. The output ends of two groups of the servo motors respectively pass through the corresponding fixing seats and are connected to the connection ends of the corresponding positioning bolts. The connection ends of two groups of the guide rails are respectively connected to the connection ends of the corresponding side plates. Positioning holes are arranged on both groups of the positioning cards. Two groups of the positioning bolts respectively pass through the corresponding positioning holes and are threadedly connected to the corresponding positioning cards. Positioning grooves are arranged on both groups of the positioning cards. Two groups of the guide rails respectively pass through the corresponding positioning grooves and are slidably connected to the corresponding positioning cards. Two groups of the racks are respectively connected to the connection ends of the corresponding positioning cards. Two groups of the gears are respectively fixedly sleeved on the corresponding connecting shafts. Two groups of the racks are respectively meshed with the output ends of the corresponding gears.

[0012] Preferably, it further includes a sliding frame, bent plates and lateral rails. The connection ends of four groups of the lateral rails are all connected to the connection end of the top cover. A groove is arranged on the sliding frame. The lateral rails pass through the corresponding grooves and are slidably connected to the corresponding sliding frames. Two groups of the bent plates are respectively rotatably connected to the corresponding lateral rails.

[0013] The beneficial effects of the present invention compared with the prior art are:

[0014] 1. During the use of the present invention, the device is stored and unfolded by folding the side plates and telescoping the top cover. By storing, the space utilization rate of the device is improved, and the portability of the device is enhanced. During this process, after the device is unfolded, the stability of the device support is improved by using the screw thread and triangular support.

[0015] 2. The present invention is driven by a motor and an electric push rod, which makes the bolt rotate for gradual lifting and telescoping, improving the automation level of the device.

[0016] 3. During the lifting process of the tray of the present invention, it is reinforced by the thread of the central axis to avoid violent lifting of the device during lifting, and the protection performance of the device is improved by locking the thread. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a three-dimensional structural schematic diagram of a folding automotive repair jack.

[0018] Figure 2 is an exploded structural schematic diagram of a folding automotive repair jack.

[0019] Figure 3 is a connection structural schematic diagram of the side door and positioning block of a folding automotive repair jack.

[0020] Figure 4 is a connection structural schematic diagram of the adjusting block and driving motor of a folding automotive repair jack.

[0021] Figure 5 is a connection structural schematic diagram of the gear and rack of a folding automotive repair jack.

[0022] Figure 6 is a connection structural schematic diagram of the tray and limit rod of a folding automotive repair jack.

[0023] The reference numerals in the figure are: 1, base; 201, first mounting seat; 202, shaft hole; 203, second mounting seat; 301, side door; 302, central disc; 303, limiting rod; 304, limiting sleeve; 305, top cover; 306, tray; 307, lateral limiting column; 308, through hole; 309, limiting hole; 401, positioning block; 402, slider; 403, support block; 404, sliding rod; 405, pull rod; 406, chute; 407, third mounting seat; 501, lead screw; 502, nut sleeve; 503, positioning rod; 504, connecting rod; 505, arc rod; 506, threaded hole; 507, fourth mounting seat; 601, driving motor; 602, side plate; 603, connecting shaft; 604, adjusting block; 605, knob; 606, gasket; 607, screw; 608, sliding sleeve; 609, support platform; 610, adjusting seat; 611, threaded hole; 612, hinge seat; 613, through hole; 614, card slot; 701, servo motor; 702, guide rail; 703, positioning bolt; 704, positioning card; 705, gear; 706, rack; 707, fixed seat; 708, positioning hole; 709, positioning groove; 801, sliding frame; 802, bent plate; 803, lateral rail; 804, groove. Detailed implementation mode

[0024] To further understand the features, technical means, specific purposes and functions achieved by the present invention, the present invention will be described in further detail below in conjunction with the drawings and specific implementation modes.

[0025] Refer to Figures 1-6 : A folding automotive repair jack, comprising a base 1 and a folding device. The folding device is evenly installed on the base 1. The folding device further includes an opening and closing device, a support device, a central axis device, a lifting mechanism and an adjusting device. Two groups of first mounting seats 201 are provided on the base 1. The opening and closing device passes through the first mounting seats 201 and is rotatably connected to the base 1. A shaft hole 202 is provided on the opening and closing device. The central axis device passes through the shaft hole 202 and is rotatably connected to the opening and closing device. Two groups of the support devices are evenly installed on the corresponding opening and closing devices. The connecting end of the lifting mechanism is connected to the connecting end of the corresponding opening and closing device. A second mounting seat 203 is provided on the lifting mechanism. The adjusting device passes through the second mounting seat 203 and is rotatably connected to the lifting mechanism.

[0026] S1: During the placement of the device, the side door 301 and the top cover 305 are buckled to make the device in a cuboid state, achieving the effect of storing and preparing the device, avoiding a large occupied area when unfolded and resulting in a high space occupancy ratio. During the use of the device, rotate the opening and closing device to horizontally place the side door 301 and the base 1. By horizontally placing, the base 1 is extended to improve the stability of the flat laying at the bottom of the device. During this process, pull the pull rod 405 to drive the sliding rod 404 connected thereto to slide. Cooperate with the slider 402 to slide and drive the support block 403 to rotate and fold with the sliding rod 404 to form a triangular stable structure;

[0027] S2: During this process, start the lifting mechanisms on the two groups of side doors 301 to make the driving motor 601 drive the screw rod 607 to rotate, thereby driving the support platform 609 connected by a triangle to lift the central axis device. During the lifting of the central axis device, prevent the device from dropping sharply through the thread of the screw rod 501 and buffer through the thread of the screw rod 501;

[0028] S3: During the rotation of the lifting device, the situation of skewed rotation angle may occur. To adjust the parallel state of the support platform 609 and the tray 306, start the adjustment device to rotate, drive the connecting shaft 603 to rotate accordingly, and thereby adjust the horizontal position of the lifting mechanism in real time.

[0029] Refer to Figures 2-3 : The opening and closing device further includes side doors 301, a central disk 302, limit rods 303, limit sleeves 304, a top cover 305, a tray 306, and lateral limit columns 307. The two groups of side doors 301 respectively pass through the corresponding first mounting seats 201 and are rotatably connected to the base 1. A through hole 308 is provided on the base 1. The central disk 302 passes through the through hole 308 and is fixedly sleeved with the base 1. The connecting ends of the two groups of limit rods 303 are connected to the connecting end of the central disk 302. Limit holes 309 are provided on the limit sleeves 304. The two groups of limit rods 303 respectively pass through the corresponding limit holes 309 and are slidably connected to the corresponding limit sleeves 304. The connecting end of the tray 306 is connected to the top ends of the two groups of limit sleeves 304. The connecting end of the top cover 305 is connected to the top end of the tray 306. The connecting ends of the four groups of lateral limit columns 307 are connected to the bottom end of the tray 306.

[0030] Refer to Figure 3: The support device further includes positioning blocks 401, sliders 402, support blocks 403, sliding rods 404, and pull rods 405. The connecting ends of the four groups of positioning blocks 401 are respectively connected to the connecting ends of the corresponding side doors 301. Chute grooves 406 are provided on each of the four groups of positioning blocks 401. The four groups of sliders 402 respectively pass through the corresponding chute grooves 406 and are slidably connected to the corresponding positioning blocks 401. Third mounting seats 407 are provided on both the four groups of positioning blocks 401 and the sliders 402. The four groups of support blocks 403 and the four groups of sliding rods 404 respectively pass through the corresponding third mounting seats 407 and are rotatably connected to the corresponding positioning blocks 401 and sliders 402. The four groups of support blocks 403 are respectively hinged to the corresponding sliding rods 404. The connecting ends of the two groups of pull rods 405 are respectively connected to the connecting ends of the corresponding sliding rods 404.

[0031] Refer to Figures 2-6 : The central axis device further includes a lead screw 501, a nut sleeve 502, a positioning rod 503, a connecting rod 504, and an arc-shaped rod 505. The connecting end of the nut sleeve 502 is connected to the bottom end of the tray 306. The lead screw 501 passes through the shaft hole 202 and is rotatably connected to the central disk 302. The connecting ends of the two groups of positioning rods 503 are both connected to the connecting end of the nut sleeve 502. A threaded hole 506 is provided inside the nut sleeve 502. The lead screw 501 passes through the threaded hole 506 and is threadedly connected to the nut sleeve 502. Fourth mounting seats 507 are provided on both the positioning rod 503 and the central disk 302. The arc-shaped rod 505 and the connecting rod 504 respectively pass through the corresponding fourth mounting seats 507 and are rotatably connected to the positioning rod 503 and the central disk 302. The connecting ends of the corresponding arc-shaped rod 505 and the connecting rod 504 are hinged.

[0032] Refer to Figures 1-4: The lifting mechanism further includes a driving motor 601, side plates 602, connecting shafts 603, adjusting blocks 604, turning knobs 605, gaskets 606, screw rods 607, sliding sleeves 608 and support platforms 609. The two groups of side plates 602 are respectively connected to the connecting ends of the corresponding side doors 301. Adjusting seats 610 are provided on both groups of side plates 602. The two groups of connecting shafts 603 respectively pass through the corresponding adjusting seats 610 and are rotatably connected to the corresponding side plates 602. The two groups of gaskets 606 are respectively provided with screw holes 611 through which the corresponding connecting shafts 603 pass. The two groups of turning knobs 605 respectively pass through the corresponding screw holes 611 and are slidably connected to the corresponding gaskets 606 and are threadedly connected to the corresponding connecting shafts 603. The four groups of adjusting blocks 604 are respectively fixedly sleeved on the corresponding connecting shafts 603. Hinge seats 612 are provided on all four groups of adjusting blocks 604. The four corresponding sliding sleeves 608 respectively pass through the corresponding hinge seats 612 and are rotatably connected to the corresponding adjusting blocks 604. Penetrating holes 613 are provided on all eight groups of sliding sleeves 608. The four screw rods 607 respectively pass through the corresponding penetrating holes 613 and are threadedly connected to the corresponding sliding sleeves 608. The connecting end of the driving motor 601 is connected to the connecting end of the corresponding sliding sleeve 608. The output end of the driving motor 601 passes through the penetrating hole 613 and is connected to the connecting end of the screw rod 607. The four groups of gaskets 606 are respectively rotatably connected to the connecting ends of the corresponding adjusting blocks 604. The two groups of support platforms 609 are respectively rotatably connected to the corresponding sliding sleeves 608. Card slots 614 are provided on both groups of support platforms 609. The four groups of gaskets 606 respectively pass through the corresponding card slots 614 and are rotatably connected to the corresponding support platforms 609.

[0033] Refer to Figures 2-5 : The adjusting device further includes a servo motor 701, guide rails 702, positioning bolts 703, positioning cards 704, gears 705 and racks 706. A fixed seat 707 is provided on the side plate 602. The connecting ends of the two groups of servo motors 701 are respectively connected to the connecting ends of the corresponding fixed seats 707. The output ends of the two groups of servo motors 701 respectively pass through the corresponding fixed seats 707 and are connected to the connecting ends of the corresponding positioning bolts 703. The connecting ends of the two groups of guide rails 702 are respectively connected to the connecting ends of the corresponding side plates 602. Positioning holes 708 are provided on both groups of positioning cards 704. The two groups of positioning bolts 703 respectively pass through the corresponding positioning holes 708 and are threadedly connected to the corresponding positioning cards 704. Positioning grooves 709 are provided on both groups of positioning cards 704. The two groups of guide rails 702 respectively pass through the corresponding positioning grooves 709 and are slidably connected to the corresponding positioning cards 704. The two groups of racks 706 are respectively connected to the connecting ends of the corresponding positioning cards 704. The two groups of gears 705 are respectively fixedly sleeved on the corresponding connecting shafts 603. The two groups of racks 706 are respectively meshed with the output ends of the corresponding gears 705.

[0034] Reference Figure 1 : It further includes a sliding carriage 801, a bent plate 802 and a lateral rail 803. The connecting ends of the four groups of the lateral rails 803 are all connected to the connecting ends of the top cover 305. A groove 804 is provided on the sliding carriage 801. The lateral rail 803 passes through the corresponding groove 804 and is slidably connected to the corresponding sliding carriage 801. The two groups of the bent plates 802 are respectively rotatably connected to the corresponding lateral rails 803.

[0035] Embodiment: A folding automotive repair jack of the present invention, the usage method further includes:

[0036] S1: Support the whole device through the base 1. During the process of vehicle repair, rotate the side door 301 so that it moves axially along the first mounting seat 201. During this process, pull the pull rod 405 to drive the sliding rod 404 connected thereto to rotate. During the rotation, drive the corresponding slider 402 to slide. After the slider 402 slides in the chute 406, drive the sliding rod 404 and the support block 403 to form a triangular stable support structure. During this process, when it is necessary to repair the support device, modular processing can be carried out by disassembling and assembling the positioning block 401;

[0037] S2: After the device is supported, start the driving motor 601. During its rotation, drive the screw rod 607 connected thereto to rotate. Through the threaded connection relationship between the screw rod 607 and the corresponding sliding sleeve 608, the opposing sliding sleeves 608 move towards each other to contract or expand, thereby driving the adjusting block 604 and the support platform 609 rotatably connected to the corresponding sliding sleeve 608 to perform a scissor-like movement, so as to lift the tray 306 in a triangular stable structure;

[0038] S3: During this process, according to the horizontal direction of the support platform 609 and the tray 306, start the servo motor 701 to drive the positioning bolt 703 connected thereto to rotate. Through the threaded connection relationship between the positioning bolt 703 and the positioning card 704, the positioning card 704 slides on the guide rail 702. During this process, the rack 706 connected to the positioning card 704 slides accordingly, thereby driving the gear 705 and the connecting shaft 603 to rotate to adjust the adjusting block 604. After the adjustment is completed, auxiliary locking can be performed to improve the stability of the device. By rotating the knob 605 to tighten it, drive the gasket 606 to tighten and squeeze, so as to fix the adjusting block 604.

[0039] As a preference of the above embodiment: A folding automotive repair jack of the present invention, the usage method further includes:

[0040] S1: When the tray 306 is lifted, the lateral limit column at the bottom of the tray 306 slides in the limit opening provided on the support platform 609. When the tray 306 is lifted or lowered, the limit sleeve 304 connected thereto is driven to slide in the limit rod 303, and the screw sleeve 502 connected thereto is lifted or lowered in the screw rod 501. When the screw sleeve 502 is lifted or lowered, the screw rod 501 rotates on the center plate 302 to prevent the equipment from falling sharply due to the excessive weight of the vehicle.

[0041] S2: During this process, the two sets of arc rods 505 are cross-rotated so as to be spread out to pull the device, thereby improving the handle and the integrity and height limit of the device.

[0042] As a preferred embodiment of the above, a foldable automobile repair jack of the present invention, the method of using the jack further includes:

[0043] S1: In the process of clamping the supporting part of the car, after the car contacts the top cover 305, it presses down the bent plate 802, and the bent plate 802 presents a bottom bevel state. The downward pressure of the car can drive the bent plate 802 to rotate;

[0044] S2: Adaptively fix the car after the curved plate 802 contacts it laterally;

[0045] S3: During the clamping process of the bent plate 802, the sliding frame 801 can be slid on the lateral rail 803 to allow the bent plate 802 to be adaptively adjusted.

[0046] The above embodiments only express one or several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A foldable automotive repair jack, characterized in that, It includes a base (1) and a folding device. The folding device is evenly installed on the base (1). The folding device further includes an opening and closing device, a supporting device, a central axis device, a lifting mechanism, and an adjusting device. Two groups of first mounting seats (201) are provided on the base (1). The opening and closing device passes through the first mounting seats (201) and is rotatably connected to the base (1). A shaft hole (202) is provided on the opening and closing device. The central axis device passes through the shaft hole (202) and is rotatably connected to the opening and closing device. Two groups of the supporting devices are evenly installed on the corresponding opening and closing devices. The connecting end of the lifting mechanism is connected to the connecting end of the corresponding opening and closing device. A second mounting seat (203) is provided on the lifting mechanism. The adjusting device passes through the second mounting seat (203) and is rotatably connected to the lifting mechanism.

2. The folding vehicle maintenance jack according to claim 1, wherein, The opening and closing device further includes side doors (301), a central disc (302), limiting rods (303), limiting sleeves (304), a top cover (305), a tray (306), and lateral limiting columns (307). Two groups of the side doors (301) respectively pass through the corresponding first mounting seats (201) and are rotatably connected to the base (1). A through hole (308) is provided on the base (1). The central disc (302) passes through the through hole (308) and is fixedly sleeved with the base (1). The connecting ends of two groups of the limiting rods (303) are both connected to the connecting end of the central disc (302). Limiting holes (309) are provided on the limiting sleeves (304). Two groups of the limiting rods (303) respectively pass through the corresponding limiting holes (309) and are slidably connected to the corresponding limiting sleeves (304). The connecting end of the tray (306) is connected to the tops of two groups of the limiting sleeves (304). The connecting end of the top cover (305) is connected to the top of the tray (306). The connecting ends of four groups of the lateral limiting columns (307) are all connected to the bottom of the tray (306).

3. The folding vehicle maintenance jack according to claim 1, characterized in that, The supporting device further includes positioning blocks (401), sliders (402), supporting blocks (403), sliding rods (404), and pull rods (405). The connecting ends of four groups of the positioning blocks (401) are respectively connected to the connecting ends of the corresponding side doors (301). Four groups of chutes (406) are provided on four groups of the positioning blocks (401). Four groups of the sliders (402) respectively pass through the corresponding chutes (406) and are slidably connected to the corresponding positioning blocks (401). Third mounting seats (407) are provided on four groups of the positioning blocks (401) and the sliders (402). Four groups of the supporting blocks (403) and four groups of the sliding rods (404) respectively pass through the corresponding third mounting seats (407) and are rotatably connected to the corresponding positioning blocks (401) and sliders (402). Four groups of the supporting blocks (403) are respectively hinged to the corresponding sliding rods (404). The connecting ends of two groups of the pull rods (405) are respectively connected to the connecting ends of the corresponding sliding rods (404).

4. A foldable automotive repair jack according to claim 1, characterized in that, The central axis device further includes a lead screw (501), a nut sleeve (502), a positioning rod (503), a connecting rod (504), and an arc rod (505). The connecting end of the nut sleeve (502) is connected to the bottom end of the tray (306). The lead screw (501) passes through the shaft hole (202) and is rotatably connected to the central disc (302). The connecting ends of the two groups of positioning rods (503) are both connected to the connecting end of the nut sleeve (502). A threaded hole (506) is provided in the nut sleeve (502). The lead screw (501) passes through the threaded hole (506) and is threadedly connected to the nut sleeve (502). Fourth mounting seats (507) are provided on both the positioning rod (503) and the central disc (302). The arc rod (505) and the connecting rod (504) respectively pass through the corresponding fourth mounting seats (507) and are rotatably connected to the positioning rod (503) and the central disc (302). The connecting ends of the corresponding arc rod (505) and the connecting rod (504) are hinged.

5. A foldable vehicle maintenance jack according to claim 1, wherein, The lifting mechanism further includes a driving motor (601), side plates (602), connecting shafts (603), adjusting blocks (604), turning knobs (605), gaskets (606), screw rods (607), sliding sleeves (608), and support platforms (609). The two groups of side plates (602) are respectively connected to the connecting ends of the corresponding side doors (301). Adjusting seats (610) are provided on the two groups of side plates (602). The two groups of connecting shafts (603) respectively pass through the corresponding adjusting seats (610) and are rotatably connected to the corresponding side plates (602). The two groups of gaskets (606) are respectively provided with threaded holes (611) through which the corresponding connecting shafts (603) pass. The two groups of turning knobs (605) respectively pass through the corresponding threaded holes (611) and are slidably connected to the corresponding gaskets (606) and are threadedly connected to the corresponding connecting shafts (603). The four groups of adjusting blocks (604) are respectively fixedly sleeved on the corresponding connecting shafts (603). Hinge seats (612) are provided on the four groups of adjusting blocks (604). The four groups of corresponding sliding sleeves (608) respectively pass through the corresponding hinge seats (612) and are rotatably connected to the corresponding adjusting blocks (604). Penetrating holes (613) are provided on the eight groups of sliding sleeves (608). The four groups of screw rods (607) respectively pass through the corresponding penetrating holes (613) and are threadedly connected to the corresponding sliding sleeves (608). The connecting end of the driving motor (601) is connected to the connecting end of the corresponding sliding sleeve (608). The output end of the driving motor (601) passes through the penetrating hole (613) and is connected to the connecting end of the screw rod (607). The four groups of gaskets (606) are respectively rotatably connected to the connecting ends of the corresponding adjusting blocks (604). The two groups of support platforms (609) are respectively rotatably connected to the corresponding sliding sleeves (608). Card slots (614) are provided on the two groups of support platforms (609). The four groups of gaskets (606) respectively pass through the corresponding card slots (614) and are rotatably connected to the corresponding support platforms (609).

6. The foldable vehicle maintenance jack according to claim 5, characterized in that, The adjusting device further includes a servo motor (701), a guide rail (702), a positioning bolt (703), a positioning card (704), a gear (705) and a rack (706). A fixed seat (707) is provided on the side plate (602). The connecting ends of the two groups of servo motors (701) are respectively connected to the connecting ends of the corresponding fixed seats (707). The output ends of the two groups of servo motors (701) respectively pass through the corresponding fixed seats (707) and are connected to the connecting ends of the corresponding positioning bolts (703). The connecting ends of the two groups of guide rails (702) are respectively connected to the connecting ends of the corresponding side plates (602). Positioning holes (708) are provided on both of the two groups of positioning cards (704). The two groups of positioning bolts (703) respectively pass through the corresponding positioning holes (708) and are threadedly connected to the corresponding positioning cards (704). Positioning grooves (709) are provided on both of the two groups of positioning cards (704). The two groups of guide rails (702) respectively pass through the corresponding positioning grooves (709) and are slidably connected to the corresponding positioning cards (704). The two groups of racks (706) are respectively connected to the connecting ends of the corresponding positioning cards (704). The two groups of gears (705) are respectively fixedly sleeved on the corresponding connecting shafts (603). The two groups of racks (706) are respectively meshed with the output ends of the corresponding gears (705).

7. A foldable vehicle repair jack according to claim 1, characterized in that, It further includes a sliding frame (801), a bending plate (802) and a lateral rail (803). The connecting ends of the four groups of lateral rails (803) are all connected to the connecting ends of the top cover (305). A groove (804) is provided on the sliding frame (801). The lateral rail (803) passes through the corresponding groove (804) and is slidably connected to the corresponding sliding frame (801). The two groups of bending plates (802) are respectively rotatably connected to the corresponding lateral rails (803).

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