Horizontal hydraulic jack with height adjusting function

Abstract

The utility model discloses a horizontal hydraulic jack with a height adjusting function, and belongs to the technical field of jacks. Comprising a rack module which is provided with two wallboards, and a rack containing cavity is formed between the two wallboards; the cargo boom is arranged in the accommodating cavity of the rack; the lifting bracket is connected to the end part of one end of the cargo boom; the pressing handle is used for driving the cargo boom to move; the front wheel positioning unit is rotationally connected to the front end parts of the two wallboards and can rotate relative to the wallboards; the pair of front wheels are symmetrically connected to the front wheel positioning unit; the rear wheel positioning unit is rotationally connected to the rear end parts of the two wallboards and can rotate relative to the wallboards; and the pair of rear wheels is connected to the rear wheel positioning unit in a symmetrical state. The lifting device has the advantages that the ground clearance of the wall plate can be adjusted through the front positioning unit and the rear positioning unit which can rotate relative to the rack module, operation is convenient and reliable, the lifting device can be suitable for lifting vehicles and mechanical equipment with different ground clearances, external auxiliary tools are not needed, and the lifting device has remarkable popularization significance.

Description

Technical Field

[0001] The utility model belongs to the technical field of jacks, and particularly relates to a horizontal hydraulic jack with a height adjustment function. Background Technique

[0002] With the rapid development of China's economic society and the steady improvement of people's living standards, motorized transportation vehicles such as passenger cars and commercial vehicles have been widely used as daily commuting or cargo transportation tools. When a vehicle encounters an accidental traffic accident, human negligence, force majeure factors or internal mechanical damage, corresponding repair operations must be carried out. At the same time, especially for various motorized multi-wheel transportation vehicles with extremely large masses, a jack device that can be easily operated manually to lift the vehicle is required. The above-mentioned horizontal hydraulic jack is a jack device widely used on load-carrying vehicles or mobile equipment to support the self-weight of the equipment and adjust the level of the equipment. It is mainly used in departments such as factories, mines, and transportation for vehicle repair and other lifting and supporting work. For example, when replacing a vehicle tire, a horizontal jack can be used to lift the vehicle to separate the tire from the ground so as to replace the tire. The structure of the horizontal jack is light, strong, flexible and reliable. It can be carried and operated by one person, and has a wide range of applications. The existing horizontal jack mainly includes a frame component, a hydraulic cylinder component, a boom component, a bracket component and a push handle. The frame component includes a left wallboard and a right wallboard arranged in parallel with each other. The left wallboard and the right wallboard are assembled by bolts and nuts to form a detachable connection, and support wheels are connected to the left wallboard and the right wallboard. The boom component is sleeved in the middle of the left and right wallboards, and the bracket component is installed at the front end of the boom component. When lifting the horizontal hydraulic jack, by repeatedly pressing down the push handle, the boom component is pushed up by the hydraulic cylinder component, and finally the bracket component on the boom component jacks up the heavy object.

[0003] There is no shortage of technical information about horizontal jacks in the publicly available Chinese patent literature. Some examples are: CN217350537U (a horizontal jack), CN216512514U (a horizontal jack with an integrated frame), CN108466965B (a portable automatic horizontal jack), and CN216997450U (a horizontal jack with a strengthened structure), etc. However, for existing horizontal jacks, since the ground clearance of their frame components, namely the left and right wall panels, is constant, and this height is determined by the size of the support wheels and the connection positions of the support wheels to the left and right wall panels. However, due to the different ground clearances of different types of vehicles and mechanical equipment, for example, there is a large difference in the chassis height between off-road vehicles and sports cars. When performing jacking operations, jacks of different specifications with different jacking strokes need to be used for operation, or auxiliary tools such as adjustable trays are used to lift the overall ground clearance of the horizontal jack. This not only makes the operation cumbersome and time-consuming for adjustment, but also cannot well adapt to different types of vehicles and facilities, resulting in a reduced versatility and poor applicability of a single jack.

[0004] The patent document with the publication number CN116495655A introduces "a horizontal jack with adjustable chassis height", which includes a base and a tray arranged on the base. Lifting seats are arranged on both sides of the base. Each lifting seat is slidably connected with a number of moving blocks. The moving blocks are arranged in pairs and each is inclined with a first pushing surface. The first pushing surfaces of the two moving blocks in a pair are arranged opposite to each other. An abutting block is arranged on the side wall of the base. Each abutting block is located between the two moving blocks in a pair. The abutting block is inclined with two second pushing surfaces, and the two second pushing surfaces face away from each other. The second pushing surface abuts against the corresponding first pushing surface. The lifting seat is provided with a driving component for driving the moving blocks to move. The two moving blocks in a pair approach or move away from each other through the driving component. A connecting plate is fixed between the two lifting seats. It makes the abutting block rise or fall by the movement of the moving blocks, and then drives the base and the tray to rise or fall, thereby realizing the adjustable distance between the tray and the vehicle chassis. Although it can realize the adjustment of the chassis height of the horizontal jack, its overall structure is relatively complex, the number of components is numerous, there is a problem of high production cost, and the assembly is also very inconvenient. At the same time, the running reliability is also poor.

[0005] In view of the above situation, it is necessary to reasonably improve the structure of the existing horizontal hydraulic jack to achieve quick and reliable adjustment of the overall ground clearance of the horizontal hydraulic jack. For this reason, the applicant has made a beneficial design, and the technical solution to be introduced below is generated under this background. Summary of the Utility Model

[0006] The task of the present utility model is to provide a horizontal hydraulic jack with a height adjustment function that is structurally compact, has a small number of components, good improvement effects, and low production costs. It helps to reliably adjust the overall ground clearance of the horizontal hydraulic jack by adding a front wheel positioning unit and a rear wheel positioning unit without the need to rely on relevant auxiliary tools, thereby improving the usability and expanding the scope of use.

[0007] The task of the present utility model is accomplished as follows. A horizontal hydraulic jack with a height adjustment function includes: a frame module, which has two parallel and spaced-apart wallboards connected together, and a frame accommodation cavity is formed between the two wallboards; a lifting arm, which is arranged in the frame accommodation cavity and is hinged to the two wallboards; a lifting bracket, which is connected to one end of the lifting arm in the length direction; a push handle, which can drive the lifting arm to move through a hydraulic component. The feature is that it further includes: a front wheel positioning unit, which is rotatably connected to the front ends of the two wallboards of the frame module, can rotate relative to the frame module, and is fixedly connected to the two wallboards at a preset position; a pair of front wheels, the two front wheels are symmetrically connected to the front wheel positioning unit and can support on a horizontal plane, and the bottom ends of the front wheels are lower than the bottom of the front wheel positioning unit; a rear wheel positioning unit, which is rotatably connected to the rear ends of the two wallboards of the frame module, can also rotate relative to the frame module, and is fixedly connected to the two wallboards at a preset position; a pair of rear wheels, the two rear wheels are symmetrically connected to the rear wheel positioning unit and can also support on a horizontal plane, and the bottom ends of the rear wheels are lower than the bottom of the rear wheel positioning unit; the front wheel positioning unit and the rear wheel positioning unit can change their relative positions with respect to the frame module, thereby achieving the adjustment of the ground clearance of the frame module.

[0008] In a specific embodiment of the present utility model, the front-wheel positioning unit is a frame structure in a "П" shape and has a front-wheel frame connecting plate and two front-wheel frame mounting plates respectively formed at both ends in the length direction of the front-wheel frame connecting plate. The front-wheel frame mounting plates are perpendicular to the front-wheel frame connecting plate. Among them, the two front-wheel frame mounting plates are respectively attached to the outer surfaces of the corresponding wall panels. And in the machine frame accommodation cavity and at the rear position corresponding to the front-wheel frame mounting plates, a wall panel front hinge shaft is also rotatably connected. The two ends in the length direction of the wall panel front hinge shaft respectively penetrate out of the two side wall panels and pass through the corresponding front-wheel frame mounting plates. And on the two front-wheel frame mounting plates, a front-wheel frame mounting plate hinge bolt is also provided, and the two front-wheel frame mounting plate hinge bolts are respectively fitted and installed on the two ends of the wall panel front hinge shaft protruding out of the wall panel in the length direction, so as to realize the rotational connection between the two front-wheel frame mounting plates and the corresponding wall panels, and make the front-wheel positioning unit rotatably connected with the machine frame module.

[0009] In another specific embodiment of the present utility model, on two front wheel frame mounting plates of the front wheel positioning unit and at upper positions corresponding to the middle of the length direction of the plate body of the front wheel frame mounting plate, a front wheel frame mounting plate fixing hole is provided, and the front wheel frame mounting plate fixing hole penetrates through the thickness direction of the front wheel frame mounting plate; at the upper position near the front end of the wall panel in the length direction of the wall panel and corresponding to the front wheel positioning unit, a front wall panel limiting hole is also provided, and at the front end of the two wall panels in the length direction and at positions corresponding to the lower part of the front wall panel limiting hole, a front wall panel raising hole is also provided. In the machine frame accommodating cavity and at positions corresponding to the two front wall panel limiting holes, a front wall panel limiting hole bushing is connected, and in the machine frame accommodating cavity and at positions corresponding to the two front wall panel raising holes, a front wall panel raising hole bushing is connected. A front wheel frame positioning support shaft is also provided on the front wheel positioning unit, and a front wheel frame positioning support shaft fixing pin is also provided on the front wheel frame positioning support shaft; when the machine frame module is in the low position state, the length direction of the front wheel frame mounting plate is parallel to the length direction of the wall panel, the front wheel frame positioning support shaft can pass through the two front wheel frame mounting plate fixing holes and the front wall panel limiting hole and penetrate into the front wall panel limiting hole bushing, and the front wheel frame positioning support shaft can be fixed to the front wheel positioning unit and the wall panel through the front wheel frame positioning support shaft fixing pin, thereby realizing the fixed connection between the front wheel positioning unit and the wall panel; when the machine frame module is in the high position state, the front wheel positioning unit rotates downward around the front wall panel hinge shaft and the front wheel frame mounting plate fixing hole can move to a position corresponding to the front wall panel raising hole, the front wheel frame positioning support shaft can pass through the two front wheel frame mounting plate fixing holes and the front wall panel raising hole and penetrate into the front wall panel raising hole bushing, and the front wheel frame positioning support shaft can be fixed to the front wheel positioning unit and the wall panel through the front wheel frame positioning support shaft fixing pin, thereby realizing the fixed connection between the front wheel positioning unit and the wall panel again; the two front wheels are symmetrically arranged at the lower front positions of the respective front wheel frame mounting plates close to the front wheel frame connecting plate, and the bottom ends of the front wheels are lower than the bottom ends of the front wheel frame mounting plates; a front wheel connecting shaft is rotatably connected between the two front wheels, and the front wheel connecting shaft passes through the two front wheel frame mounting plates and is fixedly connected thereto, so that the two front wheels are rotatably connected to the front wheel positioning unit.

[0010] In yet another specific embodiment of the present utility model, the front wheel positioning unit includes a pair of front wheel positioning support rods that are symmetrically arranged in parallel at intervals. The two front wheel positioning support rods are respectively attached to the outer surfaces of the corresponding wall panels on their respective sides, and the two front wheel positioning support rods are connected by a front wheel positioning support rod connecting shaft. Moreover, the front wheel positioning support rod connecting shaft is perpendicular to the front wheel positioning support rods. In the accommodation cavity of the frame and at the rear position corresponding to the length direction of the front wheel positioning support rods, a front support rod hinge shaft is also rotatably connected. The two ends of the front support rod hinge shaft in the length direction respectively penetrate through the wall panels on both sides and pass through the corresponding front wheel positioning support rods on their respective sides. On the two front wheel positioning support rods, a front wheel positioning support rod hinge bolt is also provided, and the two front wheel positioning support rod hinge bolts are respectively fitted and installed on the two ends of the front support rod hinge shaft that protrude out of the wall panels in the length direction, thereby realizing the rotational connection between the two front wheel positioning support rods and the corresponding wall panels on their respective sides. On the two front wheel positioning support rods, a front wheel positioning support rod sliding hole is provided along their length direction. The two end portions of the front wheel positioning support rod connecting shaft in the length direction are respectively slidably fitted and installed in the front wheel positioning support rod sliding holes on both sides, and the two end portions of the front wheel positioning support rod connecting shaft in the length direction protrude out of the front wheel positioning support rod sliding holes on both sides. At the near-end portions of the two end portions of the front wheel positioning support rod connecting shaft in the length direction and at positions close to the inner surface of the front wheel positioning support rod, a pair of front spring connectors are also connected in a matching manner. The front spring connectors include a front spring sleeve and a front spring body connected to the front spring sleeve. The front spring sleeve is sleeved on the shaft body of the front wheel positioning support rod connecting shaft, and the spring foot of the front spring body away from the front spring sleeve is hooked on the protruding member installed on the wall panel. At the front bottom position of the wall panel in the length direction and close to the front wheel positioning support rod, a front wall panel positioning hole is also provided. The lower part of the front wall panel positioning hole is designed to be an open-mouth type. At the bottom of the wall panel and at the rear position corresponding to the front wall panel positioning hole, a front wall panel displacement hole is also provided. The lower part of the front wall panel displacement hole is also designed to be an open-mouth type. During the rotation of the front wheel positioning support rod around the front support rod hinge shaft, the two end portions of the front wheel positioning support rod connecting shaft in the length direction can be respectively fitted and installed into the front wall panel positioning holes or the front wall panel displacement holes on both sides. When the frame module is in the low position state, the two end portions of the front wheel positioning support rod connecting shaft in the length direction pass through the front end ports of the front wheel positioning support rod sliding holes on both sides, and the two end portions of the front wheel positioning support rod connecting shaft in the length direction are fitted and installed in the front wall panel positioning holes of the wall panels on both sides, thereby realizing the fixed connection between the front wheel positioning unit and the wall panel.When the rack module is in the high position state, the two front-wheel positioning support rods rotate downward around the front support rod hinge shaft, and both ends of the front-wheel positioning support rod connection shaft in the length direction can pass through the rear-end ports of the sliding holes of the two side front-wheel positioning support rods and are fitted and installed in the front displacement holes of the two side wall panels, thereby realizing the fixed connection between the front-wheel positioning unit and the wall panels again; the two front wheels are symmetrically arranged at the front-end positions of their respective corresponding front-wheel positioning support rods, and the bottom ends of the front wheels are lower than the bottom ends of the front-wheel positioning support rods; a front-wheel connection shaft is also rotatably connected between the two front wheels, and the front-wheel connection shaft passes through the two front-wheel positioning support rods and is fixedly connected thereto, so that the two front wheels are rotatably connected to the front-wheel positioning unit.;

[0011] In yet another specific embodiment of the present invention, the rear-wheel positioning unit is a frame structure in a "П" shape and also has a rear-wheel frame connection plate and two rear-wheel frame mounting plates respectively formed at both ends of the rear-wheel frame connection plate in the length direction, and the rear-wheel frame mounting plates are perpendicular to the rear-wheel frame connection plate; wherein, the two rear-wheel frame mounting plates are respectively attached to the outer surfaces of their respective corresponding wall panels, and a wall panel rear hinge shaft is rotatably connected in the rack accommodation cavity and at a position corresponding to the rear of the rear-wheel frame mounting plates, and both ends of the wall panel rear hinge shaft in the length direction respectively extend outwards through the two side wall panels and pass through their respective corresponding rear-wheel frame mounting plates, and a rear-wheel frame mounting plate hinge bolt is also provided on each of the two rear-wheel frame mounting plates, and the two rear-wheel frame mounting plate hinge bolts are respectively fitted and installed on both ends of the wall panel rear hinge shaft extending out of the wall panel in the length direction, thereby realizing the rotational connection between the two rear-wheel frames and their respective corresponding wall panels, and making the rear-wheel positioning unit rotatably connected to the rack module together.

[0012] In still another specific embodiment of the present utility model, on two rear wheel frame mounting plates of the rear wheel positioning unit and at upper positions corresponding to the middle of the length direction of the plate body of the rear wheel frame mounting plate, a rear wheel frame mounting plate fixing hole is provided, and the rear wheel frame mounting plate fixing hole penetrates through the thickness direction of the rear wheel frame mounting plate; at an upper position near the rear end of the wall panel in the length direction of the wall panel, a rear wall panel limiting hole is further provided, and at the rear end of the two wall panels in the length direction and at a position corresponding to the lower side of the rear wall panel limiting hole, a rear wall panel raising hole is further provided, and a rear wheel frame positioning support shaft is further provided on the rear wheel positioning unit, and a rear wheel frame positioning support shaft fixing pin is further provided on the rear wheel frame positioning support shaft; when the frame module is in a low position state, the length direction of the rear wheel frame mounting plate is parallel to the length direction of the wall panel, the rear wheel frame positioning support shaft can pass through the two rear wheel frame mounting plate fixing holes and the rear wall panel limiting hole, and the rear wheel frame positioning support shaft can be fixed to the rear wheel positioning unit and the wall panel through the rear wheel frame positioning support shaft fixing pin, thereby realizing the fixed connection between the rear wheel positioning unit and the wall panel; when the frame module is in a high position state, the rear wheel positioning unit rotates downward around the rear wall panel hinge shaft and the rear wheel frame mounting plate fixing hole can move to a position corresponding to the rear wall panel raising hole, the rear wheel frame positioning support shaft can also pass through the two rear wheel frame mounting plate fixing holes and the rear wall panel raising hole, and the rear wheel frame positioning support shaft can be fixed to the rear wheel positioning unit and the wall panel through the rear wheel frame positioning support shaft fixing pin, thereby realizing the fixed connection between the rear wheel positioning unit and the wall panel again; the two rear wheels are symmetrically arranged at lower positions near the rear ends of the respective rear wheel frame mounting plates corresponding to the rear wheel frame connecting plates, and the bottom ends of the rear wheels are lower than the bottom ends of the rear wheel frame mounting plates; a rear wheel connecting shaft is further connected between the two rear wheels, and the rear wheel connecting shaft passes through the two rear wheel frame mounting plates and is fixedly connected thereto, so that the two rear wheels are rotatably connected to the rear wheel positioning unit.

[0013] In a further specific embodiment of the present utility model, the rear wheel positioning unit includes a pair of rear wheel positioning support rods that are symmetrically arranged in parallel at intervals. The two rear wheel positioning support rods are respectively attached to the outer surface of the corresponding wallboard on their respective sides, and the two rear wheel positioning support rods are connected by a rear wheel positioning support rod connecting shaft. The rear wheel positioning support rod connecting shaft is perpendicular to the rear wheel positioning support rods. In the rack accommodation cavity and at the rear position corresponding to the length direction of the rear wheel positioning support rods, there is also a rear support rod hinge shaft rotatably connected. The two ends of the rear support rod hinge shaft in the length direction respectively penetrate through the wallboards on both sides and pass through the corresponding rear wheel positioning support rods. On the two rear wheel positioning support rods, there is also a rear wheel positioning support rod hinge bolt respectively. The two rear wheel positioning support rod hinge bolts are respectively installed on the two ends of the rear support rod hinge shaft protruding from the wallboard in the length direction, so as to realize the rotational connection between the two rear wheel positioning support rods and the corresponding wallboards. On the two rear wheel positioning support rods, there is a rear wheel positioning support rod sliding hole opened along their length direction. The two ends of the rear wheel positioning support rod connecting shaft in the length direction are respectively slidably installed in the rear wheel positioning support rod sliding holes on both sides, and the two ends of the rear wheel positioning support rod connecting shaft in the length direction protrude out of the rear wheel positioning support rod sliding holes on both sides. At the near ends of the two ends of the rear wheel positioning support rod connecting shaft in the length direction and at the position close to the inner surface of the rear wheel positioning support rod, there is also a pair of rear spring connectors connected. The rear spring connectors include a rear spring sleeve and a rear spring body connected to the rear spring sleeve. The rear spring sleeve is sleeved on the shaft body of the rear wheel positioning support rod connecting shaft, and the spring foot of the rear spring body away from the rear spring sleeve is hooked on the protruding member installed on the wallboard. At the rear bottom position of the wallboard close to the rear wheel positioning support rod in the length direction, there is also a rear wallboard positioning hole. The lower part of the rear wallboard positioning hole is designed with an open mouth. At the bottom of the wallboard and at the front position corresponding to the rear wallboard positioning hole, there is also a rear wallboard displacement hole. The lower part of the rear wallboard displacement hole is also designed with an open mouth. During the rotation of the rear wheel positioning support rod around the rear support rod hinge shaft, the two ends of the rear wheel positioning support rod connecting shaft in the length direction can be respectively installed in the rear wallboard positioning holes or the rear wallboard displacement holes on both sides. When the rack module is in the low position state, the two ends of the rear wheel positioning support rod connecting shaft in the length direction pass through the rear end ports of the rear wheel positioning support rod sliding holes on both sides, and the two ends of the rear wheel positioning support rod connecting shaft in the length direction are installed in the rear wallboard positioning holes on both sides of the wallboard, thereby realizing the fixed connection between the rear wheel positioning unit and the wallboard.When the rack module is in the high position state, the two rear-wheel positioning support rods rotate downward around the rear support rod hinge shaft, and both ends of the rear-wheel positioning support rod connection shaft in the length direction can pass through the front-end ports of the rear-wheel positioning support rod sliding holes and are fitted and installed in the wall panel rear displacement holes on both sides of the wall panel, thereby realizing the fixed connection between the rear-wheel positioning unit and the wall panel again; the two rear wheels are symmetrically arranged at the front-end positions of their respective corresponding rear-wheel positioning support rods, and the bottom end of the rear wheel is lower than the bottom end of the rear-wheel positioning support rod; and a rear-wheel connecting shaft is rotatably connected between the two rear wheels, and the rear-wheel connecting shaft passes through the two rear-wheel positioning support rods and is fixedly connected therewith, so that the two rear wheels are rotatably connected to the rear-wheel positioning unit.;

[0014] In a further specific embodiment of the present invention, a wall panel handle is also installed on the surface of each of the two wall panels on the side opposite to the rack accommodating cavity.

[0015] In a still further specific embodiment of the present invention, the front-wheel frame connecting plate and the two front-wheel frame mounting plates are of an integrally formed structure, that is, the front-wheel positioning unit is integrally formed.

[0016] In a still further specific embodiment of the present invention, the rear-wheel frame connecting plate and the two rear-wheel frame mounting plates are also of an integrally formed structure, that is, the rear-wheel positioning unit is also integrally formed.

[0017] The beneficial effects of the present invention are as follows: First, by optimizing the structure and adding a front-wheel positioning unit and a rear-wheel positioning unit, the front-wheel positioning unit and the rear-wheel positioning unit can rotate relative to the rack module and can be fixed together with the wall panel at a preset position. And because the front wheel is connected to the front-wheel positioning unit and the rear wheel is connected to the rear-wheel positioning unit, the front-wheel positioning unit and the rear-wheel positioning unit can drive the front wheel and the rear wheel to move respectively and generate displacement in the height direction, so as to adjust the ground clearance height of the two wall panels, and can make the rack module and the boom, the lifting bracket and the push handle connected to the rack module move together in the height direction, thereby realizing the adjustment of the overall ground clearance height of the horizontal hydraulic jack, without the need to rely on auxiliary tools such as adjusting trays or change the use height by lengthening the rack. The height adjustment can be achieved through the change of the positions of its own components, with convenient and reliable operation, compact structure, and can meet the lifting requirements of vehicles and mechanical equipment with different ground clearance heights, having significant promotion significance; in addition, this technical solution has few modifications to the original structure, realizes the best improvement of functionality, can make full use of the original production line for production, has low production cost, and has significant promotion significance. Brief Description of the Drawings

[0018] Figure 1 Schematic diagram of the overall structure of an embodiment of the present utility model in the low position state;

[0019] Figure 2 is Figure 1 Exploded perspective view of the embodiment shown in the low position state;

[0020] Figure 3 is Figure 1 Exploded perspective view of the embodiment shown in the high position state;

[0021] Figure 4 is Figure 1 Exploded perspective view of the embodiment shown in the high position state;

[0022] Figure 5 is Figure 1 Exploded perspective view of the frame module, front wheel frame and rear wheel frame in the embodiment shown;

[0023] Figure 6 Exploded perspective view of another embodiment of the present utility model.

[0024] In the figure: 1. Frame module, 11. Wall panel, 111. Front limit hole of wall panel, 1111. Bush for front limit hole of wall panel, 112. Front elevation hole of wall panel, 1121. Bush for front elevation hole of wall panel, 113. Rear limit hole of wall panel, 114. Rear elevation hole of wall panel, 115. Front positioning hole of wall panel, 116. Front displacement hole of wall panel, 117. Rear positioning hole of wall panel, 118. Rear displacement hole of wall panel, 119. Handle of wall panel, 12. Frame accommodating cavity, 13. Front hinge shaft of wall panel, 14. Rear hinge shaft of wall panel, 15. Front support rod hinge shaft, 16. Rear support rod hinge shaft; 2. Boom; 3. Lifting bracket; 4. Pushing hand; 5. Front wheel positioning unit, 51. Connecting plate of front wheel frame, 52. Mounting plate of front wheel frame, 521. Hinge bolt for mounting plate of front wheel frame, 522. Fixing hole of mounting plate of front wheel frame, 53. Positioning support shaft of front wheel frame, 531. Fixing pin for positioning support shaft of front wheel frame, 54. Front wheel positioning support rod, 541. Hinge bolt for front wheel positioning support rod, 542. Sliding hole of front wheel positioning support rod, 55. Connecting shaft of front wheel positioning support rod, 56. Front spring connecting piece, 561. Front spring sleeve, 562. Front spring body; 6. Front wheel, 61. Connecting shaft of front wheel; 7. Rear wheel positioning unit, 71. Connecting plate of rear wheel frame, 72. Mounting plate of rear wheel frame, 721. Hinge bolt for mounting plate of rear wheel frame, 722. Fixing hole of mounting plate of rear wheel frame, 73. Positioning support shaft of rear wheel frame, 731. Fixing pin for positioning support shaft of rear wheel frame, 74. Rear wheel positioning support rod, 741. Hinge bolt for rear wheel positioning support rod, 742. Sliding hole of rear wheel positioning support rod, 75. Connecting shaft of rear wheel positioning support rod, 76. Rear spring connecting piece, 761. Rear spring sleeve, 762. Rear spring body; 8. Rear wheel, 81. Connecting shaft of rear wheel. Detailed implementation mode

[0025] The following will be described in detail by way of embodiments. However, the descriptions of the embodiments are not limitations on the solutions of the present invention. Any equivalent transformation that is merely formal rather than substantial based on the concept of the present invention should be regarded as falling within the scope of the technical solutions of the present invention.

[0026] In the following description, all concepts related to directions or orientations such as up, down, left, right, front and rear are in reference to the current Figure 1 position state, and thus should not be construed as special limitations on the technical solutions provided by the present invention. Embodiment 1:

[0027] Please refer to Figures 1 to 5, which shows a horizontal hydraulic jack with a height adjustment function, including: a frame module 1, the frame module 1 has two parallel and spaced-apart wall panels 11 connected together, and a frame accommodation cavity 12 is formed between the two wall panels 11; a lifting arm 2, the lifting arm 2 is arranged in the frame accommodation cavity 12 and is hinged to the two wall panels 11, and a rotating shaft for supporting and hinged to the lifting arm 2 is connected between the two wall panels 11; a lifting bracket 3, the lifting bracket 3 is connected to the front end of the lifting arm 2 in the length direction; a push button 4, the push button 4 can drive the lifting arm 2 to move through a hydraulic component.

[0028] As the technical key points of the technical solution provided by the present invention: the horizontal hydraulic jack with a height adjustment function further includes a front wheel positioning unit 5, the front wheel positioning unit 5 is rotatably connected to the front ends of the two wall panels 11 of the frame module 1, the front wheel positioning unit 5 can rotate relative to the frame module 1 and is fixedly connected to the two wall panels 11 at a preset position; a pair of front wheels 6, the two front wheels 6 are symmetrically connected to the front wheel positioning unit 5 and can be supported on a horizontal plane, and the bottom end of the front wheel 6 is lower than the bottom of the front wheel positioning unit 5; a rear wheel positioning unit 7, the rear wheel positioning unit 7 is rotatably connected to the rear ends of the two wall panels 11 of the frame module 1, the rear wheel positioning unit 7 can also rotate relative to the frame module 1 and is fixedly connected to the two wall panels 11 at a preset position; a pair of rear wheels 8, the two rear wheels 8 are symmetrically connected to the rear wheel positioning unit 7 and can also be supported on a horizontal plane, and the bottom end of the rear wheel 8 is lower than the bottom of the rear wheel positioning unit 7; the front wheel positioning unit 5 and the rear wheel positioning unit 7 can realize the change of the relative position with the frame module 1, so as to achieve the adjustment of the ground clearance of the frame module 1; specifically, when the front wheel positioning unit 5 and the rear wheel positioning unit 7 move downward relative to the frame module 1 and are fixedly connected to the wall panel 11 again, the front wheel 6 and the rear wheel 8 can be supported on a horizontal plane, so that the frame module 1 and the lifting arm 2, the lifting bracket 3 and the push button 4 connected to the frame module 1 rise together, so that the horizontal hydraulic jack can be applied to the jacking and lifting operations of vehicles or mechanical equipment with different chassis heights.

[0029] In this embodiment, the aforementioned front-wheel positioning unit 5 is a frame structure in a "П" shape and is provided with a front-wheel frame connecting plate 51 and two front-wheel frame mounting plates 52 respectively formed at both ends of the front-wheel frame connecting plate 51 in the length direction. The aforementioned front-wheel frame mounting plates 52 are perpendicular to the front-wheel frame connecting plate 51. Among them, the two aforementioned front-wheel frame mounting plates 52 are respectively attached to the outer surfaces of the corresponding wall panels 11, and in the aforementioned machine frame accommodating cavity 12 and at the rear position corresponding to the aforementioned front-wheel frame mounting plates 52, there is also a wall panel front hinge shaft 13 rotatably connected. The two ends of the wall panel front hinge shaft 13 in the length direction respectively penetrate through the two side wall panels 11 and pass through the corresponding front-wheel frame mounting plates 52. And on the two aforementioned front-wheel frame mounting plates 52, there is also a front-wheel frame mounting plate hinge bolt 521 provided, and the two aforementioned front-wheel frame mounting plate hinge bolts 521 are respectively fitted and installed on the two ends of the wall panel front hinge shaft 13 protruding from the wall panel 11 in the length direction, so as to realize the rotational connection between the two aforementioned front-wheel frame mounting plates 52 and the corresponding wall panels 11, making the aforementioned front-wheel positioning unit 5 rotatably connected to the machine frame module 1, and the front-wheel positioning unit 5 can rotate around the aforementioned wall panel front hinge shaft 13.

[0030] Further, on the two front-wheel frame mounting plates 52 of the aforementioned positioning unit 5 and at the upper position in the middle of the length direction of the front-wheel frame mounting plate 52, there is a front-wheel frame mounting plate fixing hole 522 provided, and the front-wheel frame mounting plate fixing hole 522 penetrates through the thickness direction of the front-wheel frame mounting plate 52. At the upper position near the front end of the wall panel 11 in the length direction and corresponding to the front-wheel positioning unit 5, there is also a wall panel front limiting hole 111 provided, and at the lower position corresponding to the wall panel front limiting hole 111 at both front end parts of the two aforementioned wall panels 11 in the length direction, there is also a wall panel front elevation hole 112 provided. In the aforementioned machine frame accommodating cavity 12 and at the position corresponding to the two aforementioned wall panel front limiting holes 111, there is also a wall panel front limiting hole bushing 1111 connected, and in the aforementioned machine frame accommodating cavity 12 and at the position corresponding to the two aforementioned wall panel front elevation holes 112, there is also a wall panel front elevation hole bushing 1121 connected. And on the aforementioned front-wheel positioning unit 5, there is also a front-wheel frame positioning support shaft 53 provided, and on the front-wheel frame positioning support shaft 53, there is also a front-wheel frame positioning support shaft fixing pin 531 provided. When the aforementioned machine frame module 1 is in the low position, please refer to Figure 1 And Figure 2, the length direction of the aforementioned front wheel frame mounting plate 52 is parallel to the length direction of the wall panel 11. The front wheel frame positioning support shaft 53 can pass through the two front wheel frame mounting plate fixing holes 522 and the front wall limiting hole 111 of the wall panel and penetrate into the aforementioned front wall limiting hole bushing 1111. Moreover, the front wheel frame positioning support shaft 53 can be fixed to the front wheel positioning unit 5 and the wall panel 11 through the front wheel frame positioning support shaft fixing pin 531, thereby realizing the fixed connection between the front wheel positioning unit 5 and the wall panel 11. When the aforementioned frame module 1 is in the high position, please refer to Figure 3 and Figure 4 . At this time, the aforementioned front wheel positioning unit 5 rotates downward around the front wall hinge shaft 12 of the wall panel, and the aforementioned front wheel frame mounting plate fixing hole 522 can move to a position corresponding to the aforementioned front wall elevation hole 112 of the wall panel. The front wheel frame positioning support shaft 53 can pass through the two front wheel frame mounting plate fixing holes 521 and the front wall elevation hole 112 of the wall panel and penetrate into the aforementioned front wall elevation hole bushing 1121. Moreover, the front wheel frame positioning support shaft 53 can be fixed to the front wheel positioning unit 5 and the wall panel 11 through the front wheel frame positioning support shaft fixing pin 531, thereby realizing the fixed connection between the front wheel positioning unit 5 and the wall panel 11 again.

[0031] It should be noted that: in this technical solution, only a single front wall elevation hole 112 is provided on the wall panel 11 corresponding to the front wall limiting hole 111. After the front wheel positioning unit 5 rotates downward, its front wheel frame mounting plate fixing hole 521 can only coincide and align with the single front wall limiting hole 111, so that the front wheel positioning unit 5 can only be fixed at a preset position after rotating downward. Of course, the number of the aforementioned front wall elevation holes 112 is not limited to this. During production, the number of front wall elevation holes 112 can be increased according to actual needs, so that the front wheel positioning unit 5 can be fixed at multiple preset positions below the wall panel 11, which are all within the protection scope of the present utility model.

[0032] Please continue to refer to Figures 1 to 5 . The two aforementioned front wheels 6 are symmetrically arranged at the lower front end positions of their respective corresponding front wheel frame mounting plates 52 close to the front wheel frame connecting plate 51. The bottom end of the aforementioned front wheel 6 is lower than the bottom end of the aforementioned front wheel frame mounting plate 52. Moreover, a front wheel connecting shaft 61 is connected between the two aforementioned front wheels 6. The front wheel connecting shaft 61 passes through the two front wheel frame mounting plates 52 and is fixedly connected thereto, so that the two aforementioned front wheels 6 are rotatably connected to the aforementioned front wheel positioning unit 5.

[0033] In this embodiment, the aforementioned rear-wheel positioning unit 7 is a frame structure in the shape of a "П", and also has a rear-wheel frame connecting plate 71 and two rear-wheel frame mounting plates 72 formed at both ends of the rear-wheel frame connecting plate 71 in the length direction. The aforementioned rear-wheel frame mounting plates 72 are perpendicular to the rear-wheel frame connecting plate 71. Among them, the two aforementioned rear-wheel frame mounting plates 72 are respectively attached to the outer surfaces of the corresponding wall panels 11, and in the aforementioned machine frame accommodating cavity 12 and at a position corresponding to the rear of the aforementioned rear-wheel frame mounting plate 72, a wall panel rear hinge shaft 14 is rotatably connected. The two ends of the wall panel rear hinge shaft 14 in the length direction respectively penetrate out of the two side wall panels 11 and pass through the corresponding rear-wheel frame mounting plates 72. And on the two aforementioned rear-wheel frame mounting plates 72, a rear-wheel frame mounting plate hinge bolt 721 is also provided, and the two aforementioned rear-wheel frame mounting plate hinge bolts 721 are respectively fitted and installed on the two ends of the wall panel rear hinge shaft 14 that protrude out of the wall panel 11 in the length direction, so as to realize the rotational connection between the two aforementioned rear-wheel frames 72 and the corresponding wall panels 11, so that the aforementioned rear-wheel positioning unit 7 is rotationally connected to the machine frame module 1, and the rear-wheel positioning unit 7 can rotate around the aforementioned wall panel rear hinge shaft 14.

[0034] Further, on two rear-wheel frame mounting plates 72 of the aforementioned rear-wheel positioning unit 7 and at upper positions corresponding to the middle of the length direction of the plate body of the rear-wheel frame mounting plate 7, a rear-wheel frame mounting plate fixing hole 722 is provided. The aforementioned rear-wheel frame mounting plate fixing hole 722 penetrates through the thickness direction of the rear-wheel frame mounting plate 72; at the upper position near the rear end of the wall panel 11 in the length direction, a rear-wall limiting hole 113 is further provided. At the rear end of the two aforementioned wall panels 11 in the length direction and at positions corresponding to the lower side of the rear-wall limiting hole 113, a rear-wall elevation hole 114 is further provided. On the aforementioned rear-wheel positioning unit 7, a rear-wheel frame positioning support shaft 73 is further provided, and a rear-wheel frame positioning support shaft fixing pin 731 is further provided on the rear-wheel frame positioning support shaft 73; when the aforementioned frame module 1 is in the low position, the length direction of the aforementioned rear-wheel frame mounting plate 72 is parallel to the length direction of the wall panel 11. The rear-wheel frame positioning support shaft 73 can pass through the two rear-wheel frame mounting plate fixing holes 722 and the rear-wall limiting hole 113, and the rear-wheel frame positioning support shaft 73 can be fixed to the rear-wheel positioning unit 7 and the wall panel 11 through the rear-wheel frame positioning support shaft fixing pin 731, thereby realizing the fixed connection between the rear-wheel positioning unit 7 and the wall panel 11; when the aforementioned frame module 1 is in the high position, the aforementioned rear-wheel positioning unit 7 rotates downward around the rear-wall hinge shaft 14 and the aforementioned rear-wheel frame mounting plate fixing hole 722 can move to a position corresponding to the aforementioned rear-wall elevation hole 114. The rear-wheel frame positioning support shaft 73 can also pass through the two rear-wheel frame mounting plate fixing holes 722 and the rear-wall elevation hole 114, and the rear-wheel frame positioning support shaft 73 can be fixed to the rear-wheel positioning unit 7 and the wall panel 11 through the rear-wheel frame positioning support shaft fixing pin 731, thereby realizing the fixed connection between the rear-wheel positioning unit 7 and the wall panel 11 again. At this time, the rear wheel 8 moves downward relative to the frame module 1, so that the frame module 1 finally moves upward relative to the horizontal plane to realize its own elevation.

[0035] Please continue to refer to Figures 1 to 5 , the two aforementioned rear wheels 8 are symmetrically arranged at the lower positions near the rear ends of the respective rear-wheel frame mounting plates 72 close to the rear-wheel frame connecting plate 71. The bottom end of the aforementioned rear wheel 8 is lower than the bottom end of the rear-wheel frame mounting plate 72; between the two aforementioned rear wheels 8, a rear-wheel connecting shaft 81 is further connected. The rear-wheel connecting shaft 81 passes through the two rear-wheel frame mounting plates 72 and is fixedly connected to them, so that the two aforementioned rear wheels 8 are rotatably connected to the aforementioned rear-wheel positioning unit 7.

[0036] In this embodiment, the foregoing front-wheel positioning unit 5 uses the front-wall hinge shaft 13 connecting itself to the wall panel 11 as the rotation center axis, and the distance from the front-wheel connecting shaft 61 to this rotation center axis as the rotation radius. Moreover, the rotation angle of the front-wheel positioning unit 5 is the angle between the connecting lines of the two connecting holes, namely the front-wall limiting hole 111 and the front-wall elevation hole 112 on the wall panel 11, to the rotation center axis, so as to perform the rotation operation. At the same time, the front-wheel frame positioning support shaft 53 can penetrate into either the front-wall limiting hole 111 or the front-wall elevation hole 112, thereby adjusting the overall lowest height of the foregoing horizontal hydraulic jack; the foregoing rear-wheel positioning unit 7 is the same by analogy and will not be elaborated here too much.

[0037] In this embodiment, on the surfaces of the two foregoing wall panels 11 opposite to the foregoing machine frame accommodating cavity 12, a wall panel handle 119 is also installed. The setting of the foregoing wall panel handle 119 facilitates the user's grasping and can effectively realize the lifting and pushing of the wall panel 11 and the machine frame module 1.

[0038] Please continue to refer to Figure 5 , the foregoing front-wheel frame connecting plate 51 and the two front-wheel frame mounting plates 52 are of an integrally formed structure, and the joints between the front-wheel frame connecting plate 51 and the front-wheel frame mounting plates 52 are all in arc transition. Moreover, the foregoing front-wheel positioning unit 5 is integrally formed, with high structural strength and convenient for production.

[0039] Furthermore, the foregoing rear-wheel frame connecting plate 71 and the two rear-wheel frame mounting plates 72 are also of an integrally formed structure, and the foregoing rear-wheel positioning unit 7 is integrally formed, with high structural strength and convenient for production.

[0040] Please refer to Figures 1 to 4 And please focus on combining with Figure 5, briefly describe the working principle of this embodiment: When it is necessary to realize the lifting action of the aforementioned horizontal hydraulic jack, the user repeatedly presses the push button 4, thereby being able to drive the hydraulic cylinder component to push the lifting arm 2 upwards, and finally the lifting bracket 3 on the lifting arm 2 jacks up the heavy object, that is, the relevant facilities and equipment;When it is necessary to adjust the height of the rack module 1 from the ground, if the aforementioned rack module 1 is in the low position, since the length directions of the front wheel frame mounting plate 52 and the rear wheel frame mounting plate 72 are parallel to the length direction of the aforementioned wall panel 11 at this time, and the front wheel frame positioning support shaft 53 passes through the fixing holes 522 of the two front wheel frame mounting plates and the front wall limiting holes 111 of the two wall panels 11 to fix the front wheel positioning unit 5, and the front wheel frame positioning support shaft fixing pin 531 inserted into the front wheel frame positioning support shaft 53 can ensure the fixation of the front wheel frame positioning support shaft 53 without loosening. The rear wheel frame positioning support shaft 73 passes through the fixing holes 722 of the two rear wheel frame mounting plates and the rear wall limiting holes 113 on the two wall panels 11 to fix the rear wheel positioning unit 7. At the same time, the rear wheel frame positioning support shaft fixing pin 731 inserted into the rear wheel frame positioning support shaft 73 can ensure the fixation of the rear wheel frame positioning support shaft 73 without loosening. The user can take out the front wheel frame positioning support shaft fixing pin 531 and pull out the front wheel frame positioning support shaft 53 from the front wheel positioning unit 5 and the wall panel 11, and lift the base frame module 1 of the aforementioned horizontal hydraulic jack and the front half of the lifting arm 2, so that the front wheel positioning unit 5 naturally drops around the front wall hinge shaft 13, and further adjusts the position of the front wheel positioning unit 5 so that the fixing holes 522 of the front wheel frame mounting plate on the front wheel positioning unit 5 coincide with the front wall elevation holes 112 on the two wall panels 11. Then insert the front wheel frame positioning support shaft 53 into the fixing holes 522 of the front wheel frame mounting plate and the two front wall elevation holes 112 and fit the front wheel frame positioning support shaft fixing pin 531 to achieve fixed locking. At this time, the two front wheels 6 move downward relative to the rack module 1 and can support on the ground, so that the front part of the rack module 1 is lifted upward. Subsequently, the user can take out the front wheel frame positioning support shaft fixing pin 531 and pull out the front wheel frame positioning support shaft 53 from the front wheel positioning unit 5 and the wall panel 11, and lift the rear half of the base frame module 1 of the aforementioned horizontal hydraulic jack and the lifting arm 2, so that the rear wheel positioning unit 7 naturally drops around the rear wall hinge shaft 14. The user then adjusts the position of the rear wheel positioning unit 7 so that the fixing holes 722 of the rear wheel frame mounting plate on the rear wheel positioning unit 7 coincide with the rear wall elevation holes 114 on the two wall panels 11. Then insert the rear wheel frame positioning support shaft 73 into the fixing holes 722 of the rear wheel frame mounting plate and the two rear wall elevation holes 114 and fit the rear wheel frame positioning support shaft fixing pin 731 to achieve fixed locking. At this time, the two rear wheels 8 move downward relative to the rack module 1 and can support on the ground, so that the rear part of the rack module 1 is lifted upward. Thus, the common rise of the rack module 1, the lifting arm 2, the lifting bracket 3 and the pressing hand 4 connected to the rack module 1 is realized, and the adjustment of the height of the rack module 1 and the lifting arm 2 from the ground is achieved, so that the aforementioned horizontal hydraulic jack can be applied to the lifting work of vehicles and mechanical equipment with different ground clearances;When it is necessary to adjust the aforementioned horizontal hydraulic jack from the high position state to the low position state, only the opposite operation of the above actions needs to be performed, and the adjustment is simple, convenient and reliable. Embodiment 2:

[0041] Please refer to Figure 6 , in this embodiment, different from Embodiment 1: the aforementioned front wheel positioning unit 5 is composed of a pair of front wheel positioning support rods 54 that are symmetrically arranged in parallel at intervals. The two front wheel positioning support rods 54 are respectively attached to the outer surfaces of the corresponding wall panels 11, and the two front wheel positioning support rods 54 are connected by a front wheel positioning support rod connecting shaft 55, and the front wheel positioning support rod connecting shaft 55 is perpendicular to the front wheel positioning support rod 54.

[0042] Further, a front support rod hinge shaft 15 is rotatably connected in the aforementioned rack accommodation cavity 12 and at the rear position corresponding to the length direction of the aforementioned front wheel positioning support rod 54. The two ends of the front support rod hinge shaft 15 in the length direction respectively penetrate out of the two side wall panels 11 and pass through the corresponding front wheel positioning support rods 54. A front wheel positioning support rod hinge bolt 541 is also provided on each of the two front wheel positioning support rods 54, and the two front wheel positioning support rod hinge bolts 541 are respectively installed on the two ends of the front support rod hinge shaft 15 that protrude out of the wall panel 11 in the length direction, so as to realize the rotational connection between the two front wheel positioning support rods 54 and the corresponding wall panels 11; and a front wheel positioning support rod sliding hole 542 is opened on the two front wheel positioning support rods 54 along their length directions. The two ends of the front wheel positioning support rod connecting shaft 55 in the length direction are respectively slidably fitted and installed in the front wheel positioning support rod sliding holes 542 on both sides, and the two ends of the front wheel positioning support rod connecting shaft 55 in the length direction protrude out of the front wheel positioning support rod sliding holes 542 on both sides. A pair of front spring connectors 56 are also connected at the near ends of the two ends of the front wheel positioning support rod connecting shaft 55 in the length direction and close to the inner surface of the front wheel positioning support rod 54. The front spring connector 56 includes a front spring sleeve 561 and a front spring body 562 connected to the front spring sleeve 561. The front spring sleeve 561 is sleeved on the shaft body of the front wheel positioning support rod connecting shaft 55, and the spring foot of the front spring body 562 away from the front spring sleeve 561 is hooked on the protrusion installed on the wall panel 11.

[0043] In this embodiment, a front wall panel positioning hole 115 is further formed at the front bottom position of the front wall panel 11 near the front end of the front wheel positioning support rod 54 in the length direction of the front wall panel. The lower part of the front wall panel positioning hole 115 is designed with an open mouth. And at the bottom of the front wall panel 11 and at the rear position corresponding to the front wall panel positioning hole 115, a front wall panel displacement hole 116 is further formed. The lower part of the front wall panel displacement hole 116 is also designed with an open mouth. During the rotation of the front wheel positioning support rod 54 around the front support rod hinge shaft 15, the two ends of the front wheel positioning support rod connecting shaft 55 in the length direction can be respectively fitted and installed into the front wall panel positioning holes 115 or the front wall panel displacement holes 116 on both sides. And when the frame module 1 is in the low position state, the two ends of the front wheel positioning support rod connecting shaft 55 in the length direction pass through the front end ports of the sliding holes 542 of the front wheel positioning support rods on both sides, and the two ends of the front wheel positioning support rod connecting shaft 55 in the length direction are fitted and installed in the front wall panel positioning holes 115 of the front wall panels 11 on both sides, thereby realizing the fixed connection between the front wheel positioning unit 5 and the front wall panel 11. And when the frame module 1 is in the high position state, the two front wheel positioning support rods 54 rotate downward around the front support rod hinge shaft 15, and the two ends of the front wheel positioning support rod connecting shaft 55 in the length direction can pass through the rear end ports of the sliding holes 542 of the front wheel positioning support rods on both sides and be fitted and installed in the front wall panel displacement holes 116 of the front wall panels 11 on both sides, thereby realizing the fixed connection between the front wheel positioning unit 5 and the front wall panel 11 again.

[0044] Please refer to Figure 6 , the two front wheels 6 are symmetrically arranged at the front end positions of their respective corresponding front wheel positioning support rods 54, and the bottom end of the front wheel 6 is lower than the bottom end of the front wheel positioning support rod 54. And a front wheel connecting shaft 61 is connected between the two front wheels 6. The front wheel connecting shaft 61 passes through the two front wheel positioning support rods 54 and is fixedly connected therewith, so that the two front wheels 6 are rotatably connected to the front wheel positioning unit 5.

[0045] Similarly, the rear wheel positioning unit 7 also consists of a pair of rear wheel positioning support rods 74 arranged in parallel, spaced and symmetrically. The two rear wheel positioning support rods 74 are respectively attached to the outer surfaces of the corresponding front wall panels 11, and the two rear wheel positioning support rods 74 are connected by a rear wheel positioning support rod connecting shaft 75, and the rear wheel positioning support rod connecting shaft 75 is perpendicular to the rear wheel positioning support rod 74.

[0046] Further, a rear support rod hinge shaft 16 is rotatably connected in the frame accommodating cavity 12 and at a rear position corresponding to the length direction of the aforementioned rear wheel positioning support rod 74. Both ends of the rear support rod hinge shaft 16 in the length direction penetrate outwards through the two side wall plates 11 on both sides and pass through the respective rear wheel positioning support rods 74 corresponding thereto. On the two aforementioned rear wheel positioning support rods 74, a rear wheel positioning support rod hinge bolt 741 is provided. The two aforementioned rear wheel positioning support rod hinge bolts 741 are respectively installed in cooperation with the two end portions of the rear support rod hinge shaft 16 protruding out of the side wall plates 11 in the length direction, so as to realize the rotational connection between the two rear wheel positioning support rods 74 and the respective side wall plates 11 corresponding thereto. A rear wheel positioning support rod sliding hole 742 is formed on the two aforementioned rear wheel positioning support rods 74 along their length directions. Both end portions of the rear wheel positioning support rod connecting shaft 75 in the length direction are slidably installed in the rear wheel positioning support rod sliding holes 742 on both sides. Both end portions of the rear wheel positioning support rod connecting shaft 75 in the length direction protrude outwards from the rear wheel positioning support rod sliding holes 742 on both sides. A pair of rear spring connectors 76 are also connected in cooperation at both ends near the length direction of the rear wheel positioning support rod connecting shaft 75 and at positions close to the inner surface of the aforementioned rear wheel positioning support rod 74. The rear spring connector 76 includes a rear spring sleeve 761 and a rear spring body 762 connected to the rear spring sleeve 761. The rear spring sleeve 761 is sleeved on the shaft body of the rear wheel positioning support rod connecting shaft 75, and one end spring foot of the rear spring body 762 away from the rear spring sleeve 76 is hooked on the protruding member installed on the aforementioned side wall plate 11.

[0047] Please continue to refer to Figure 6, a rear wallboard positioning hole 117 is also provided at the bottom position near the rear end of the foregoing rear wheel positioning support rod 74 in the length direction of the foregoing wallboard 11. The lower part of the rear wallboard positioning hole 117 is designed with an open mouth. And a rear wallboard displacement hole 118 is also provided at the bottom of the foregoing wallboard 11 and at the front position corresponding to the foregoing rear wallboard positioning hole 117. The lower part of the rear wallboard displacement hole 118 is also designed with an open mouth. During the rotation of the foregoing rear wheel positioning support rod 74 around the foregoing rear support rod hinge shaft 16, the two ends of the foregoing rear wheel positioning support rod connecting shaft 75 in the length direction can be respectively fitted and installed into the rear wallboard positioning holes 117 or the rear wallboard displacement holes 118 on both sides; and when the foregoing frame module 1 is in the low position state, the two ends of the foregoing rear wheel positioning support rod connecting shaft 75 in the length direction pass through the rear end ports of the sliding holes 742 of the rear wheel positioning support rods on both sides, and the two ends of the foregoing rear wheel positioning support rod connecting shaft 75 in the length direction are fitted and installed in the rear wallboard positioning holes 117 of the wallboards 11 on both sides, thereby realizing the fixed connection between the rear wheel positioning unit 5 and the wallboard 11; and when the foregoing frame module 1 is in the high position state, the two foregoing rear wheel positioning support rods 74 are turned downward around the rear support rod hinge shaft 16, and the two ends of the foregoing rear wheel positioning support rod connecting shaft 75 in the length direction can pass through the front end ports of the sliding holes 742 of the rear wheel positioning support rods and be fitted and installed in the rear wallboard displacement holes 118 of the wallboards 11 on both sides, thereby realizing the fixed connection between the rear wheel positioning unit 7 and the wallboard 11 again.

[0048] In this embodiment, the two foregoing rear wheels 8 are symmetrically arranged at the front end positions of the respective corresponding rear wheel positioning support rods 74, and the bottom end of the foregoing rear wheel 8 is lower than the bottom end of the foregoing rear wheel positioning support rod 74; and a rear wheel connecting shaft 81 is also connected between the two foregoing rear wheels 8. The rear wheel connecting shaft 81 passes through the two rear wheel positioning support rods 74 and is fixedly connected therewith, so that the two foregoing rear wheels 8 are rotatably connected to the foregoing rear wheel positioning unit 7.

[0049] The applicant briefly describes the working principle of this embodiment: When it is necessary to adjust the height of the frame module 1 from the ground, if the aforementioned frame module 1 is in the low position, the two ends of the front wheel positioning support rod connecting shaft 55 in the length direction are fitted and installed in the front wall positioning holes 115 of the two side wall panels 11. Then, the two ends of the rear wheel positioning support rod connecting shaft 75 in the length direction are fitted and installed in the rear wall positioning holes 117 of the two side wall panels 11. The user can forcefully turn the two front wheel positioning support rods 54 downward, causing the front wheel positioning unit 5 to flip around the front support rod hinge shaft 15, and further fitting and installing the two ends of the front wheel positioning support rod connecting shaft 55 in the length direction into the front wall displacement holes 116 of the wall panels. At this time, the two front wheels 6 move downward relative to the frame module 1 and can support on the ground, so that the front part of the frame module 1 is lifted upward, and at the same time, the front spring body 562 of the front spring connecting piece 56 is forced to expand. Similarly, the rear wheel positioning support rod 74 is also turned downward, causing the rear wheel positioning unit 7 to flip around the rear support rod hinge shaft 16, and further fitting and installing the two ends of the rear wheel positioning support rod connecting shaft 75 in the length direction into the rear wall displacement holes 118 of the wall panels. At this time, the two rear wheels 6 move downward relative to the frame module 1 and can support on the ground, so that the rear part of the frame module 1 is lifted upward, and at the same time, the rear spring body 762 of the rear spring connecting piece 76 is forced to expand. Finally, the common rise of the frame module 1, the boom 2, the lifting bracket 3, and the push button 4 connected to the frame module 1 is realized, achieving the adjustment of the height of the frame module 1 and the boom 2 from the ground, so that the aforementioned horizontal hydraulic jack can be applied to the lifting work of vehicles and mechanical equipment with different ground clearances; when it is necessary to lower the height of the frame module 1 from the ground again, only need to turn the front wheel positioning unit 5 and the rear wheel positioning unit 7 upward. The two flip again under the elastic force of the front spring body 562 and the rear spring body 762. The two ends of the front wheel positioning support rod connecting shaft 55 in the length direction can be fitted and installed in the front wall positioning holes 115 of the two side wall panels 11, and then the two ends of the rear wheel positioning support rod connecting shaft 75 in the length direction can be fitted and installed in the rear wall positioning holes 117 of the two side wall panels 11, achieving the folding of the frame module 1. The operation is simple and reliable, and has significant popularization significance.

[0050] Since the front wheel positioning unit 5 and the rear wheel positioning unit 7 provided in this application have a compact structure and convenient assembly with the frame module 1, this embodiment and Embodiment 1 each have their own characteristics and can be flexibly selected according to the actual production design requirements. In this embodiment, except for the differences in the above-mentioned front wheel positioning unit 5 and rear wheel positioning unit 7 from those in Embodiment 1, other technical features are the same as those in Embodiment 1 and will not be elaborated here.

[0051] It should be noted that the above-mentioned embodiments can be freely combined as needed. The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can still be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

[0052] In summary, the technical solution provided by the present invention makes up for the deficiencies in the prior art, successfully completes the invention task, and faithfully realizes the technical effects described by the applicant in the above technical effect column.

Claims

1. A horizontal hydraulic jack with a height adjustment function, comprising: A frame module (1), the frame module (1) is provided with two wallboards (11) arranged in parallel at intervals and connected together, and a frame accommodation cavity (12) is formed between the two wallboards (11); a boom (2), the boom (2) is arranged in the frame accommodation cavity (12) and is hinged to the two wallboards (11); a lifting bracket (3), the lifting bracket (3) is connected to one end of the boom (2) in the length direction; a push button (4), the push button (4) can drive the boom (2) to move through a hydraulic component; it is characterized in that it further includes: a front wheel positioning unit (5), the front wheel positioning unit (5) is rotatably connected to the front ends of the two wallboards (11) of the frame module (1), the front wheel positioning unit (5) can rotate relative to the frame module (1) and is fixedly connected to the two wallboards (11) at a preset position; a pair of front wheels (6), the two front wheels (6) are symmetrically connected to the front wheel positioning unit (5) and can be supported on a horizontal plane, and the bottom end of the front wheel (6) is lower than the bottom of the front wheel positioning unit (5); a rear wheel positioning unit (7), the rear wheel positioning unit (7) is rotatably connected to the rear ends of the two wallboards (11) of the frame module (1), the rear wheel positioning unit (7) can also rotate relative to the frame module (1) and is fixedly connected to the two wallboards (11) at a preset position; a pair of rear wheels (8), the two rear wheels (8) are symmetrically connected to the rear wheel positioning unit (7) and can also be supported on a horizontal plane, and the bottom end of the rear wheel (8) is lower than the bottom of the rear wheel positioning unit (7); the front wheel positioning unit (5) and the rear wheel positioning unit (7) can realize the change of the relative position with the frame module (1), so as to achieve the adjustment of the ground clearance of the frame module (1).

2. The horizontal hydraulic jack with a height adjustment function according to claim 1, characterized in that: The front wheel positioning unit (5) is a frame structure in a "П" - shaped configuration and has a front wheel frame connecting plate (51) and two front wheel frame mounting plates (52) respectively formed at both ends in the length direction of the front wheel frame connecting plate (51). The front wheel frame mounting plates (52) are perpendicular to the front wheel frame connecting plate (51). Among them, the two front wheel frame mounting plates (52) are respectively attached to the outer surfaces of the corresponding wall panels (11). And in the machine frame accommodating cavity (12), and at the rear position corresponding to the front wheel frame mounting plate (52), there is also a rotatably connected front wall panel hinge shaft (13). The two ends in the length direction of the front wall panel hinge shaft (13) respectively penetrate out of the two side wall panels (11) and pass through the corresponding front wheel frame mounting plates (52). And on the two front wheel frame mounting plates (52), there is also provided a front wheel frame mounting plate hinge bolt (521) respectively. And the two front wheel frame mounting plate hinge bolts (521) are respectively fitted and installed on the two ends of the front wall panel hinge shaft (13) protruding out of the wall panel (11) in the length direction, so as to realize the rotational connection between the two front wheel frame mounting plates (52) and the corresponding wall panels (11), and make the front wheel positioning unit (5) rotatably connected to the machine frame module (1).

3. The horizontal hydraulic jack with a height adjustment function according to claim 2, characterized in that: On two front wheel frame mounting plates (52) of the front wheel alignment unit (5) and at upper positions corresponding to the middle of the length direction of the plate body of the front wheel frame mounting plate (5), a front wheel frame mounting plate fixing hole (522) is provided, and the front wheel frame mounting plate fixing hole (522) penetrates through the thickness direction of the front wheel frame mounting plate (52); at the upper position of the front end of the wall panel (11) in the length direction and close to the front wheel alignment unit (5), a wall panel front limiting hole (111) is further provided, and at the front end of the length direction of the two wall panels (11) and at positions corresponding to the lower side of the wall panel front limiting hole (111), a wall panel front elevation hole (112) is further provided. In the machine frame accommodating cavity (12) and at positions corresponding to the two wall panel front limiting holes (111), a wall panel front limiting hole bushing (1111) is connected, and in the machine frame accommodating cavity (12) and at positions corresponding to the two wall panel front elevation holes (112), a wall panel front elevation hole bushing (1121) is connected. A front wheel frame positioning support shaft (53) is further provided on the front wheel alignment unit (5), and a front wheel frame positioning support shaft fixing pin (531) is further provided on the front wheel frame positioning support shaft (53); when the machine frame module (1) is in the low position state, the length direction of the front wheel frame mounting plate (52) is parallel to the length direction of the wall panel (11), and the front wheel frame positioning support shaft (53) can pass through the two front wheel frame mounting plate fixing holes (522) and the wall panel front limiting hole (111) and penetrate into the wall panel front limiting hole bushing (1111), and the front wheel frame positioning support shaft (53) can be fixed to the front wheel alignment unit (5) and the wall panel (11) through the front wheel frame positioning support shaft fixing pin (531), thereby realizing the fixed connection between the front wheel alignment unit (5) and the wall panel (11); when the machine frame module (1) is in the high position state, the front wheel alignment unit (5) rotates downward around the wall panel front hinge shaft (12) and the front wheel frame mounting plate fixing hole (522) can move to a position corresponding to the wall panel front elevation hole (112), and the front wheel frame positioning support shaft (53) can pass through the two front wheel frame mounting plate fixing holes (521) and the wall panel front elevation hole (112) and penetrate into the wall panel front elevation hole bushing (1121), and the front wheel frame positioning support shaft (53) can be fixed to the front wheel alignment unit (5) and the wall panel (11) through the front wheel frame positioning support shaft fixing pin (531), thereby realizing the fixed connection between the front wheel alignment unit (5) and the wall panel (11) again; the two front wheels (6) are symmetrically arranged at the lower positions of the front ends of the respective corresponding front wheel frame mounting plates (52) close to the front wheel frame connecting plate (51), and the bottom ends of the front wheels (6) are lower than the bottom ends of the front wheel frame mounting plates (52);A front-wheel connecting shaft (61) is further connected between the two front wheels (6). The front-wheel connecting shaft (61) passes through two front-wheel frame mounting plates (52) and is fixedly connected thereto, so that the two front wheels (6) are rotatably connected to the front-wheel positioning unit (5).; 4. A horizontal hydraulic jack with a height adjustment function according to claim 1, characterized in that: The front wheel alignment unit (5) includes a pair of front wheel alignment support rods (54) that are symmetrically arranged in parallel at intervals. The two front wheel alignment support rods (54) are respectively attached to the outer surfaces of the corresponding wall panels (11). A front wheel alignment support rod connecting shaft (55) is used to connect between the two front wheel alignment support rods (54), and the front wheel alignment support rod connecting shaft (55) is perpendicular to the front wheel alignment support rods (54). A front support rod hinge shaft (15) is rotatably connected in the frame accommodation cavity (12) at a rear position corresponding to the length direction of the front wheel alignment support rods (54). The two ends of the front support rod hinge shaft (15) in the length direction respectively extend outwards through the wall panels (11) on both sides and pass through the corresponding front wheel alignment support rods (54). A front wheel alignment support rod hinge bolt (541) is provided on each of the two front wheel alignment support rods (54). The two front wheel alignment support rod hinge bolts (541) are respectively installed on the two ends of the front support rod hinge shaft (15) extending out of the wall panel (11) in the length direction, so as to realize the rotational connection between the two front wheel alignment support rods (54) and the corresponding wall panels (11). A front wheel alignment support rod sliding hole (542) is provided on each of the two front wheel alignment support rods (54) along their length directions. The two ends of the front wheel alignment support rod connecting shaft (55) in the length direction are respectively slidably installed in the front wheel alignment support rod sliding holes (542) on both sides, and the two ends of the front wheel alignment support rod connecting shaft (55) in the length direction extend outwards through the front wheel alignment support rod sliding holes (542) on both sides. A pair of front spring connectors (56) are also connected at positions near the two ends of the front wheel alignment support rod connecting shaft (55) in the length direction and close to the inner surfaces of the front wheel alignment support rods (54). The front spring connectors (56) include a front spring sleeve (561) and a front spring body (562) connected to the front spring sleeve (561). The front spring sleeve (561) is sleeved on the shaft body of the front wheel alignment support rod connecting shaft (55), and the spring foot of the front spring body (562) far from the front spring sleeve (561) is hooked on the protruding member installed on the wall panel (11).Moreover, a front wall panel positioning hole (115) is formed at the front bottom position of the wall panel (11) close to the front wheel positioning support rod (54) in the length direction of the wall panel. The lower part of the front wall panel positioning hole (115) is designed with an open mouth. And a front wall panel displacement hole (116) is formed at the bottom of the wall panel (11) and at the rear position corresponding to the front wall panel positioning hole (115). The lower part of the front wall panel displacement hole (116) is also designed with an open mouth. During the rotation of the front wheel positioning support rod (54) around the front support rod hinge shaft (15), the two ends of the front wheel positioning support rod connecting shaft (55) in the length direction can be respectively fitted and installed into the front wall panel positioning holes (115) or the front wall panel displacement holes (116) on both sides. And when the frame module (1) is in the low position state, the two ends of the front wheel positioning support rod connecting shaft (55) in the length direction pass through the front end ports of the front wheel positioning support rod sliding holes (542) on both sides, and the two ends of the front wheel positioning support rod connecting shaft (55) in the length direction are fitted and installed in the front wall panel positioning holes (115) of the wall panels (11) on both sides, thereby realizing the fixed connection between the front wheel positioning unit (5) and the wall panel (11). When the frame module (1) is in the high position state, the two front wheel positioning support rods (54) rotate downward around the front support rod hinge shaft (15), and the two ends of the front wheel positioning support rod connecting shaft (55) in the length direction can pass through the rear end ports of the front wheel positioning support rod sliding holes (542) on both sides and be fitted and installed in the front wall panel displacement holes (116) of the wall panels (11) on both sides, thereby realizing the fixed connection between the front wheel positioning unit (5) and the wall panel (11) again. And the two front wheels (6) are symmetrically arranged at the front end positions of their respective corresponding front wheel positioning support rods (54), and the bottom end of the front wheel (6) is lower than the bottom end of the front wheel positioning support rod (54). And a front wheel connecting shaft (61) is connected between the two front wheels (6). The front wheel connecting shaft (61) passes through the two front wheel positioning support rods (54) and is fixedly connected thereto, so that the two front wheels (6) are rotatably connected to the front wheel positioning unit (5).; 5. A horizontal hydraulic jack with a height adjustment function according to claim 1, characterized in that: The rear wheel positioning unit (7) is a frame structure in a "П" - shaped configuration and also has a rear wheel frame connecting plate (71) and two rear wheel frame mounting plates (72) respectively formed at both ends in the length direction of the rear wheel frame connecting plate (71). The rear wheel frame mounting plates (72) are perpendicular to the rear wheel frame connecting plate (71). Among them, the two rear wheel frame mounting plates (72) are respectively attached to the outer surfaces of the corresponding wall panels (11). And in the machine frame accommodating cavity (12), and at the rear position corresponding to the rear wheel frame mounting plate (72), there is also a rotatably connected rear wall panel hinge shaft (14). The two ends in the length direction of the rear wall panel hinge shaft (14) respectively penetrate out of the two side wall panels (11) and pass through the corresponding rear wheel frame mounting plates (72). And on the two rear wheel frame mounting plates (72), there is also provided a rear wheel frame mounting plate hinge bolt (721) respectively. And the two rear wheel frame mounting plate hinge bolts (721) are respectively fitted and installed on the two ends of the rear wall panel hinge shaft (14) protruding out of the wall panel (11) in the length direction, so as to realize the rotational connection between the two rear wheel frame mounting plates (72) and the corresponding wall panels (11), and make the rear wheel positioning unit (7) rotatably connected to the machine frame module (1).

6. The horizontal hydraulic jack with a height adjustment function according to claim 5, wherein: On two rear wheel frame mounting plates (72) of the rear wheel positioning unit (7) and at upper positions corresponding to the middle of the length direction of the plate body of the rear wheel frame mounting plate (7), a rear wheel frame mounting plate fixing hole (722) is provided, and the rear wheel frame mounting plate fixing hole (722) penetrates through the thickness direction of the rear wheel frame mounting plate (72); at an upper position near the rear end of the rear wheel frame (5) in the length direction of the wall panel (11), a wall panel rear limiting hole (113) is further provided, and at the rear end of the two wall panels (11) in the length direction and at positions corresponding to the lower side of the wall panel rear limiting hole (113), a wall panel rear elevation hole (114) is also provided. A rear wheel frame positioning support shaft (73) is further provided on the rear wheel positioning unit (7), and a rear wheel frame positioning support shaft fixing pin (731) is further provided on the rear wheel frame positioning support shaft (73); when the rack module (1) is in the low position state, the length direction of the rear wheel frame mounting plate (72) is parallel to the length direction of the wall panel (11), the rear wheel frame positioning support shaft (73) can pass through the two rear wheel frame mounting plate fixing holes (722) and the wall panel rear limiting hole (113), and the rear wheel frame positioning support shaft (73) can be fixed to the rear wheel positioning unit (7) and the wall panel (11) through the rear wheel frame positioning support shaft fixing pin (731), thereby realizing the fixed connection between the rear wheel positioning unit (7) and the wall panel (11); when the rack module (1) is in the high position state, the rear wheel positioning unit (7) rotates downward around the wall panel rear hinge shaft (14) and the rear wheel frame mounting plate fixing hole (722) can move to a position corresponding to the wall panel rear elevation hole (114), the rear wheel frame positioning support shaft (73) can also pass through the two rear wheel frame mounting plate fixing holes (722) and the wall panel rear elevation hole (114), and the rear wheel frame positioning support shaft (73) can be fixed to the rear wheel positioning unit (7) and the wall panel (11) through the rear wheel frame positioning support shaft fixing pin (731), thereby realizing the fixed connection between the rear wheel positioning unit (7) and the wall panel (11) again; the two rear wheels (8) are symmetrically arranged at lower positions near the rear ends of the respective rear wheel frame mounting plates (72) corresponding to them, and the bottom ends of the rear wheels (8) are lower than the bottom ends of the rear wheel frame mounting plates (72); a rear wheel connecting shaft (81) is connected between the two rear wheels (8), and the rear wheel connecting shaft (81) passes through the two rear wheel frame mounting plates (72) and is fixedly connected to them, so that the two rear wheels (8) are rotatably connected to the rear wheel positioning unit (7).

7. A horizontal hydraulic jack with a height adjustment function according to claim 1, characterized in that: The rear wheel alignment unit (7) includes a pair of rear wheel alignment support rods (74) that are symmetrically arranged in parallel at intervals. The two rear wheel alignment support rods (74) are respectively attached to the outer surfaces of the corresponding wall panels (11), and the two rear wheel alignment support rods (74) are connected by a rear wheel alignment support rod connecting shaft (75). The rear wheel alignment support rod connecting shaft (75) is perpendicular to the rear wheel alignment support rods (74). In the machine frame accommodation cavity (12) and at the rear position corresponding to the length direction of the rear wheel alignment support rods (74), a rear support rod hinge shaft (16) is rotatably connected. The two ends of the rear support rod hinge shaft (16) in the length direction respectively extend outwards through the two side wall panels (11) and pass through the corresponding rear wheel alignment support rods (74). A rear wheel alignment support rod hinge bolt (741) is provided on each of the two rear wheel alignment support rods (74). The two rear wheel alignment support rod hinge bolts (741) are respectively installed on the two ends of the rear support rod hinge shaft (16) extending out of the wall panel (11) in the length direction, so as to realize the rotational connection between the two rear wheel alignment support rods (74) and the corresponding wall panels (11). A rear wheel alignment support rod sliding hole (742) is provided on each of the two rear wheel alignment support rods (74) along their length directions. The two ends of the rear wheel alignment support rod connecting shaft (75) in the length direction are respectively slidably installed in the rear wheel alignment support rod sliding holes (742) on both sides, and the two ends of the rear wheel alignment support rod connecting shaft (75) in the length direction extend outwards from the rear wheel alignment support rod sliding holes (742) on both sides. A pair of rear spring connectors (76) are connected at the positions near the two ends of the rear wheel alignment support rod connecting shaft (75) in the length direction and close to the inner surfaces of the rear wheel alignment support rods (74). The rear spring connectors (76) include a rear spring sleeve (761) and a rear spring body (762) connected to the rear spring sleeve (761). The rear spring sleeve (761) is sleeved on the shaft body of the rear wheel alignment support rod connecting shaft (75), and the spring foot of the rear spring body (762) away from the rear spring sleeve (76) is hooked on the protruding member installed on the wall panel (11).Moreover, a rear wall panel positioning hole (117) is formed at the bottom position near the rear end of the rear wheel positioning support rod (74) in the length direction of the wall panel (11). The lower part of the rear wall panel positioning hole (117) is designed with an open mouth. And a rear wall panel displacement hole (118) is formed at the bottom of the wall panel (11) and at the front position corresponding to the rear wall panel positioning hole (117). The lower part of the rear wall panel displacement hole (118) is also designed with an open mouth. During the rotation of the rear wheel positioning support rod (74) around the rear support rod hinge shaft (16), the two ends of the rear wheel positioning support rod connecting shaft (75) in the length direction can be respectively fitted and installed into the rear wall panel positioning holes (117) or the rear wall panel displacement holes (118) on both sides. And when the frame module (1) is in the low position state, the two ends of the rear wheel positioning support rod connecting shaft (75) in the length direction pass through the rear end ports of the sliding holes (742) of the rear wheel positioning support rods on both sides, and the two ends of the rear wheel positioning support rod connecting shaft (75) in the length direction are fitted and installed in the rear wall panel positioning holes (117) of the wall panels (11) on both sides, thereby realizing the fixed connection between the rear wheel positioning unit (5) and the wall panel (11). When the frame module (1) is in the high position state, the two rear wheel positioning support rods (74) rotate downward around the rear support rod hinge shaft (16), and the two ends of the rear wheel positioning support rod connecting shaft (75) in the length direction can pass through the front end ports of the sliding holes (742) of the rear wheel positioning support rods and be fitted and installed in the rear wall panel displacement holes (118) of the wall panels (11) on both sides, thereby realizing the fixed connection between the rear wheel positioning unit (7) and the wall panel (11) again. And the two rear wheels (8) are symmetrically arranged at the front end positions of the corresponding rear wheel positioning support rods (74) respectively. The bottom end of the rear wheel (8) is lower than the bottom end of the rear wheel positioning support rod (74). And a rear wheel connecting shaft (81) is connected between the two rear wheels (8). The rear wheel connecting shaft (81) passes through the two rear wheel positioning support rods (74) and is fixedly connected therewith, so that the two rear wheels (8) are rotatably connected to the rear wheel positioning unit (7).; 8. A horizontal hydraulic jack with a height adjustment function according to claim 1, characterized in that: On the surfaces of the two wall panels (11) opposite to the rack accommodating cavity (12), a wall panel handle (119) is also installed.

9. A horizontal hydraulic jack with a height adjustment function according to claim 2, characterized in that: The front wheel frame connecting plate (51) and the two front wheel frame mounting plates (52) are of an integrally formed structure, that is, the front wheel positioning unit (5) is integrally formed.

10. A horizontal hydraulic jack with a height adjustment function according to claim 5, characterized in that: The rear wheel frame connecting plate (71) and the two rear wheel frame mounting plates (72) are also of an integrally formed structure, that is, the rear wheel positioning unit (7) is also integrally formed.

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