Jack convenient to move outdoors

Abstract

The invention relates to the field of mechanical transportation and lifting, in particular to a jack convenient to move outdoors, which comprises a moving chassis provided with driving wheels, an electric jack assembly arranged on the moving chassis, a track module and an unfolding module, and two combined tracks of the track module are rotatably connected outside the driving wheels on the two sides of the moving chassis respectively. A spur plate of the unfolding module is rotationally connected with the combined type crawler belt through a transmission assembly and has the working state, the storage state and the transition state. The electric jack assembly comprises an oil pump, an oil tank, a composite lifting arm structure, a driving motor and the like, and is further provided with a control module. The technical effects of being convenient to move in the field, capable of adapting to complex terrains, stable and reliable in lifting structure, capable of achieving automatic operation through the control module and the like are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of mechanical transportation and lifting, in particular to a jack convenient for field movement. BACKGROUND

[0002] In the field of mechanical engineering and field operations, jacks serve as an important lifting tool, and their development is of great significance to improve work efficiency and ensure operation safety. With the increasing number of field engineering construction, rescue and emergency activities, higher requirements are put forward for the movement and use performance of jacks in complex field environments. Traditional jacks meet the basic lifting needs to some extent, but gradually show their shortcomings in adapting to variable terrain and flexible movement in the field. In order to cope with these challenges, the relevant field has been exploring how to improve the structure and performance of jacks to better serve field operation scenarios.

[0003] In related technologies, in order to realize the movement of jacks in the field, two ways are usually adopted. One is manual carrying, and the operator manually carries the jack to the position where it needs to be used. Although this method is simple and direct, for heavy jacks, manual carrying not only consumes a lot of physical strength, but also is low in efficiency, and in some complex field environments such as mountains and muddy ground, the difficulty of manual carrying will be further increased, and even the carrying task cannot be completed. The other way is to use an ordinary wheeled chassis to carry the jack, and to realize the position transfer of the jack through the movement of the wheeled chassis. However, the ordinary wheeled chassis has poor passability in the field, and when encountering soft ground, gullies and other terrains, it is easy to slip and get stuck, etc., which causes the jack to be unable to reach the operation position smoothly.

[0004] The main defects of the prior art are that the manual carrying method is labor-intensive and low in efficiency, and cannot meet the rapidity and efficiency requirements of field operations; and the method of using an ordinary wheeled chassis to carry the jack has poor passability, and is difficult to move freely in complex field terrains, which limits the use range and flexibility of the jack in the field. SUMMARY

[0005] In order to overcome the above technical problems, the present application provides a jack convenient for field movement.

[0006] The jack convenient for field movement provided by the present application adopts the following technical solution: The jack is convenient for moving in the field, comprising a moving chassis provided with driving wheels, an electric jack assembly arranged on the moving chassis, a track module comprising two combined tracks rotatably connected to the driving wheels on both sides of the moving chassis, and a deployment module comprising a stationary blade rotatably connected to the combined tracks through a transmission assembly, the stationary blade having a working state arranged in a horizontal direction, a storage state arranged in a vertical direction, and a transition state between the two states, the stationary blade being in the working state when moving to a side of the combined tracks close to the ground, the stationary blade being in the storage state when moving to a side of the combined tracks away from the ground, and the stationary blade being in the transition state when moving to a position of the combined tracks and the driving wheels.

[0007] By adopting the above technical scheme, the moving chassis provided with the driving wheels is convenient for moving the jack in the field, the electric jack assembly can jack up heavy objects, the two combined tracks of the track module are rotatably connected to the driving wheels, which can adapt to complex terrains in the field and enhance the moving stability, and the stationary blade of the deployment module can be switched between the working state, the storage state and the transition state, the contact area of the jack with the ground can be increased when being close to the ground in the working state to improve the supporting stability, the space occupation can be reduced when being away from the ground in the storage state, and the stationary blade can shake off the mud adhered when being in contact with the ground in the transition state.

[0008] Optionally, the control module further comprises a communication assembly and a control terminal, and the communication assembly is signal-connected with the electric jack assembly and the moving chassis.

[0009] By adopting the above technical scheme, the control module is arranged, the communication assembly is signal-connected with the electric jack assembly and the moving chassis, the electric jack assembly and the moving chassis can be remotely controlled through the control terminal, the jack can be flexibly operated when moving in the field, and the convenience and flexibility of use are improved.

[0010] Optionally, the electric jack assembly comprises an oil pump, an oil tank, a composite lifting arm structure and a driving motor, the driving motor is drivingly connected with the oil pump, an input end of the oil cylinder is connected with an output end of the oil pump, an input end of the oil pump is connected with the oil tank, and an output end of the oil cylinder is drivingly connected with the composite lifting arm structure to drive the composite lifting arm structure.

[0011] By adopting the above technical solution, the drive motor drives the oil pump to work. The oil pump draws oil from the oil tank and delivers the oil to the oil cylinder. The oil cylinder outputs power to drive the composite lifting arm structure, realizing the lifting function of the electric jack assembly and providing stable and reliable lifting power for the jack that is easy to move in the field.

[0012] Optionally, the hydraulic cylinder is horizontally positioned on top of the mobile chassis; the composite lifting arm structure includes: a pair of support plates, the support plates being arranged symmetrically along the extension and retraction direction of the hydraulic cylinder, the support plates being fixedly connected to the top of the mobile chassis; and a lifting arm body, the lifting arm body including a long arm and a short arm arranged perpendicularly to each other, the lifting arm body being rotatably connected to the support plates via a lifting arm shaft, the lifting arm shaft being connected at the junction of the long arm and the short arm, the lifting arm shaft being perpendicular to the support plate, and the end of the long arm away from the short arm being connected via a first rotating shaft. The system includes a top support; a pair of pull rods symmetrically arranged along the plane of symmetry of the support plate; one end of one pull rod is rotatably connected to one of the pair of support plates via a pull rod shaft, and the other end is rotatably connected to one side of the top support via a second rotating shaft; both the pull rod shaft and the second rotating shaft are parallel to the lifting arm shaft; and a traction frame fixedly connected to the output end of the hydraulic cylinder, with traction rods rotatably connected to both ends of the traction frame; the end of each traction rod away from the traction frame is rotatably connected to the end of the short arm away from the long arm via a third rotating shaft.

[0013] By adopting the above technical solution, the hydraulic cylinder is horizontally mounted on the top of the mobile chassis. When the hydraulic cylinder extends or retracts, it drives the traction frame, which is fixedly connected to its output end, to move. The traction rods at both ends of the traction frame pull the lifting arm body to rotate around the lifting arm axis. Since the long arm and short arm of the lifting arm body are perpendicular to each other, the end of the long arm away from the short arm is connected to the top support through the first rotating shaft. At the same time, a pair of tie rods are symmetrically arranged, one end of which is rotatably connected to the support plate through the tie rod shaft, and the other end is rotatably connected to the top support through the second rotating shaft. When the mobile chassis is fixed, the lifting arm body, through its rotation, can drive the top support to perform a combined action of lifting and horizontal retraction, thereby realizing the lifting operation of the tires.

[0014] Optionally, the line connecting the lifting arm shaft and the pull rod shaft is parallel to the horizontal direction, the center distance between the lifting arm shaft and the first rotating shaft is equal to the center distance between the pull rod shaft and the second rotating shaft, and the center distance between the lifting arm shaft and the pull rod shaft is equal to the center distance between the first rotating shaft and the second rotating shaft.

[0015] By adopting the above technical solution, a stable parallelogram structure is formed between the lifting arm body and the tie rod, ensuring that the top support rises and falls smoothly during the lifting process, effectively improving the stability and reliability of the jack lifting operation. At the same time, because the line connecting the lifting arm shaft and the tie rod shaft is parallel to the horizontal direction, the top support can always remain horizontal.

[0016] Optionally, the support plates are provided with a horizontally arranged slide rail on one side close to each other, and the traction frame is provided with sliders at both ends that cooperate with the slide rail.

[0017] By adopting the above technical solution, when the electric jack assembly is working, the horizontal slide rail on the support plate cooperates with the sliders at both ends of the traction frame to guide and limit the movement of the traction frame, making the movement of the traction frame more stable and smooth, thereby ensuring the stability and reliability of the composite lifting arm structure and enabling the electric jack assembly to achieve the lifting function more accurately.

[0018] Optionally, the bottom of the top support on the side away from the first rotating shaft is provided with digging teeth.

[0019] By adopting the above technical solution, when the electric jack assembly works in reverse, the digging teeth can dig out the sand stuck in front of and to the side of the tire, creating space for the tire to move.

[0020] Optionally, the drive wheel is a sprocket, and the combined track includes two chain links arranged side by side at intervals. One end of each chain link meshes with one of the drive wheels on one side of the mobile chassis, and the other end of each chain link meshes with the other drive wheel on the same side of the mobile chassis. Each chain link includes multiple chain plates, and any two adjacent chain plates are connected by track plates. The track plates are rotatably connected to the chain plates by track pins. The track plates are located on the side of the chain links that are far apart from each other. Between two chain links, there is a reinforcing section that is equal in number and position to the track plates in a single chain link. The left and right ends of the reinforcing section are rotatably connected to the track pins at corresponding positions.

[0021] By adopting the above technical solution, the drive wheel is configured as a sprocket that meshes with the chain links of the combined track, achieving stable transmission. The two parallel and spaced chain links, as well as the connection method between the chain links and the track plates and track pins, give the combined track good flexibility and adaptability. The setting of the reinforcing section enhances the structural strength of the combined track, improving the stability and reliability of the jacks that are easy to move in the field. The track can reduce the ground pressure, prevent the jacks from sinking, and also reduce mud and sand adhesion and siltation.

[0022] Optionally, the number of the unfolding modules is equal to and corresponds one-to-one with the number of the reinforcing sections. The transmission assembly includes a connecting rod, the extension direction of which is parallel to the track pin. The reinforcing section has a groove on the side near the inside of the chain link, and the connecting rod is slidably connected to the groove. One side of the hoe plate has a fourth rotating shaft and a fifth rotating shaft that are parallel to each other. The fourth rotating shaft and the fifth rotating shaft are both perpendicular to the connecting rod, and the fifth rotating shaft is located on the side of the fourth rotating shaft away from the inside of the chain link. The fourth rotating shaft is connected to the end of the connecting rod away from the mobile chassis through a hinge plate. The fifth rotating shaft is hinged to the side of one of the two corresponding track plates away from the mobile chassis.

[0023] By adopting the above technical solution, the number of deployable modules and the number of reinforcing sections are equal and correspond one-to-one, which can realize the reasonable layout of deployable modules and combined tracks, so that the spade plate can play a uniform role; the sliding connection between the connecting rod and the reinforcing section provides a sliding basis for the rotation of the spade plate; the spade plate is connected to the connecting rod and track plate through the fourth and fifth rotating shafts, which can realize the flexible switching between the spade plate in working state, storage state and transition state, which is convenient for adjusting the spade plate state as needed when moving in the field, and enhances the adaptability and stability of the jack in the field.

[0024] Optionally, the mobile chassis is provided with track plates on both sides, and the track plates are provided with guide grooves that cooperate with the combined track movement trajectory. The guide grooves include an upper straight groove, a lower straight groove, and a transition arc groove. The upper straight groove is located on the side of the lower straight groove away from the interior of the mobile chassis. The upper straight groove and the lower straight groove are connected through the transition arc groove. The guide grooves are provided with a clearance ring gap for the connecting rod to pass through. The end of the connecting rod away from the spade plate is provided with a guide ball that cooperates with the guide groove. The diameter of the guide ball is larger than the width of the clearance ring gap.

[0025] By adopting the above technical solution, the guide groove can guide the extension and retraction of the connecting rod. When the guide ball is in the upper straight groove, the connecting rod is in the extended state, and when the guide ball is in the lower straight groove, the connecting rod is in the retracted state. An avoidance ring gap is set at the guide groove for the connecting rod to pass through, and a guide ball with a diameter larger than the width of the avoidance ring gap is set at one end of the connecting rod to cooperate with the guide groove. This ensures that the connecting rod can move smoothly in the guide groove and will not detach from the guide groove, further ensuring that the jack plate can be smoothly switched between working, storage and transition states, and improving the stability of the jack in field movement and operation.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. The mobile chassis equipped with drive wheels and track modules can improve the jack's passability in complex terrain in the field, solving the problem of poor passability of ordinary wheeled chassis; 2. The outrigger plate of the unfolded module can be in a horizontal working state during operation, increasing the contact area and stability between the jack and the ground, and improving the safety of field operations; 3. It avoids the need for manual handling of jacks, reducing labor intensity and improving the efficiency of field operations. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of a jack that is easy to move in the field, as provided in the embodiments of this application.

[0028] Figure 2 This is a schematic diagram of the internal structure of the track disk provided in the embodiment of this application.

[0029] Explanation of reference numerals in the attached drawings: 1-Mobile chassis; 2-Drive wheel; 3-Hydraulic cylinder; 4-Support plate; 5-Lifting arm body; 501-Long arm; 502-Short arm; 6-Lifting arm shaft; 7-First rotating shaft; 8-Top support; 9-Tie rod; 10-Tie rod shaft; 11-Second rotating shaft; 12-Traction frame; 13-Traction rod; 14-Third rotating shaft; 15-Slide rail; 16-Slider; 17-Digging teeth; 18-Combined type Track; 1801-Latch plate; 1802-Track plate; 1803-Track pin; 1804-Reinforcing section; 18041-Slide groove; 19-Deployment module; 1901-Spike plate; 19011-Fourth rotating shaft; 1902-Connecting rod; 1903-Hinge plate; 1904-Trajectory disc; 19041-Upper straight groove; 19042-Lower straight groove; 19043-Avoidance circumferential seam; 1905-Guide ball. Detailed Implementation

[0030] The following is in conjunction with the appendix Figures 1-2 This application will be described in further detail.

[0031] This application discloses a jack that is easy to move in the field.

[0032] like Figure 1As shown, the jack for easy field mobility includes a mobile chassis 1 equipped with drive wheels 2, an electric jack assembly mounted on the mobile chassis 1, a track module, an deployment module 19, and a control module. The electric jack assembly is mounted on the mobile chassis 1. The combined track 18 of the track module is rotatably connected to the drive wheels 2 on both sides of the mobile chassis 1. The spade plate 1901 of the deployment module 19 is rotatably connected to the combined track 18 via a transmission assembly. The communication component of the control module is simultaneously connected to both the electric jack assembly and the mobile chassis 1. The mobile chassis 1 provides basic mobility, the track module enhances traversability in complex terrain, the spade plate 1901 of the deployment module 19 provides better stability during operation, and the control module enables remote operation. These technical features enable the jack to be easily moved, stably operated, and remotely controlled in complex field terrain.

[0033] like Figure 1 As shown, the mobile chassis 1 includes drive wheels 2 and a chassis body. The drive wheels 2 can be sprockets, which have good meshing performance with the chain and can stably transmit power. The chassis body is usually made of high-strength metal materials, such as steel, to ensure its load-bearing capacity. The chassis body provides a supporting foundation for the entire jack. The drive wheels 2 are mounted on both sides of the chassis body and are driven to rotate by a power device such as a motor in the chassis body, thereby moving the entire jack.

[0034] The electric jack assembly includes an oil pump, an oil tank, a composite lifting arm structure, a hydraulic cylinder 3, and a drive motor. The drive motor can be a DC drive motor, which has advantages such as simple structure and reliable operation. The drive motor is connected to the oil pump, and its rotation drives the oil pump. The oil tank stores hydraulic oil, and the input end of the oil pump is connected to the oil tank to draw hydraulic oil from it. The hydraulic cylinder 3 is horizontally mounted on top of the movable chassis 1. The input end of the hydraulic cylinder 3 is connected to the output end of the oil pump, which forces hydraulic oil into the cylinder 3. The output end of the hydraulic cylinder 3 is connected to the composite lifting arm structure, thereby driving the composite lifting arm structure to perform lifting actions.

[0035] like Figure 1As shown, the composite lifting arm structure includes a pair of support plates 4, a lifting arm body 5, a pair of tie rods 9, and a traction frame 12. The support plates 4 are arranged symmetrically along the extension and retraction direction of the hydraulic cylinder 3. The support plates 4 are fixedly connected to the top of the mobile chassis 1, usually by welding or bolting, to ensure the stability of the connection. The lifting arm body 5 includes a long arm 501 and a short arm 502 arranged perpendicularly to each other. The lifting arm body 5 is rotatably connected to the support plates 4 through a lifting arm shaft 6. The lifting arm shaft 6 is connected at the junction of the long arm 501 and the short arm 502 and is perpendicular to the support plates 4. The end of the long arm 501 away from the short arm 502 is connected to a top support 8 through a first rotating shaft 7. The bottom of the side of the top support 8 away from the first rotating shaft 7 is provided with digging teeth 17. The top support 8 can be made of high-strength alloy material to ensure its load-bearing capacity. A pair of tie rods 9 are symmetrically arranged along the plane of symmetry of the support plate 4. One end of one tie rod 9 is rotatably connected to one of the support plates 4 via a tie rod 9 shaft, and the other end is rotatably connected to one side of the top support 8 via a second rotating shaft 11. Both the tie rod 9 shaft and the second rotating shaft 11 are parallel to the lifting arm shaft 6, and the center distance between the lifting arm shaft 6 and the first rotating shaft 7 is equal to the center distance between the tie rod 9 shaft and the second rotating shaft 11. The center distance between the lifting arm shaft 6 and the tie rod 9 shaft is equal to the center distance between the first rotating shaft 7 and the second rotating shaft 11. The traction frame 12 is fixedly connected to the output end of the hydraulic cylinder 3. A horizontally arranged slide rail 15 is provided on the side of the support plates 4 that is close to each other. The two ends of the traction frame 12 are provided with sliders 16 that cooperate with the slide rail 15. Traction rods 13 are rotatably connected to the two ends of the traction frame 12. The end of the traction rod 13 away from the traction frame 12 is rotatably connected to the end of the short arm 502 away from the long arm 501 via a third rotating shaft 14. When the hydraulic cylinder 3 extends or retracts, it drives the lifting arm body 5 to rotate around the lifting arm shaft 6 through the traction frame 12 and traction rod 13, thereby realizing the combined action of lifting and horizontal extension of the top support 8.

[0036] like Figure 1 and Figure 2 As shown, the combined track 18 of the track module includes two parallel, spaced-apart chain links. One end of each chain link meshes with one of the drive wheels 2 on one side of the mobile chassis 1, and the other end meshes with the other drive wheel 2 on the same side of the mobile chassis 1. Each chain link includes multiple chain plates 1801. Any two adjacent chain plates 1801 are connected by track plates 1802. The track plates 1802 are rotatably connected to the chain plates 1801 via track pins 1803. The track plates 1802 are located on the side of the chain links that are furthest apart from each other. Between two chain links, there are reinforcing sections 1804, equal in number and corresponding in position to the track plates 1802 in a single chain link. The left and right ends of the reinforcing sections 1804 are rotatably connected to the corresponding track pins 1803. The reinforcing sections 1804 enhance the strength and stability of the chain links, making the track more reliable during operation.

[0037] like Figure 1 andFigure 2 As shown, the number of unfolding modules 19 is equal to the number of reinforcing sections 1804 and corresponds one-to-one. The transmission assembly includes a connecting rod 1902, the extension direction of which is parallel to the track pin 1803. The reinforcing section 1804 has a groove 18041 on the side near the inside of the chain link, and the connecting rod 1902 is slidably connected to the groove 18041. A fourth rotating shaft 19011 and a fifth rotating shaft are provided on one side of the hoe plate 1901, which are parallel to each other. Both the fourth rotating shaft 19011 and the fifth rotating shaft are perpendicular to the connecting rod 1902, and the fifth rotating shaft is located on the side of the fourth rotating shaft 19011 away from the inside of the chain link. The fourth rotating shaft 19011 is connected to the end of the connecting rod 1902 away from the moving chassis 1 through a hinge plate 1903. The fifth rotating shaft is hinged to the side of the corresponding two track plates 1802 away from the moving chassis 1. The spade plate 1901 has a working state set in the horizontal direction, a retracted state set in the vertical direction, and a transitional state between the two states. When the spade plate 1901 moves with the combined track 18 to the side of the combined track 18 closest to the ground, the spade plate 1901 is in the working state. At this time, the spade plate 1901 can cooperate with the ground to provide better support and stability. When the spade plate 1901 moves with the combined track 18 to the side of the combined track 18 away from the ground, the spade plate 1901 is in the retracted state to reduce space occupation. When the spade plate 1901 moves with the combined track 18 to the corner position between the combined track 18 and the drive wheel 2, the spade plate 1901 is in the transitional state. During the transitional state, the spade plate 1901 revolves around the axis of the drive wheel 2 and rotates around the fifth rotation axis. During the rotation, the spade plate 1901 can shake off the mud that adheres when it cooperates with the ground.

[0038] like Figure 1 and Figure 2 As shown, both sides of the mobile chassis 1 are provided with track plates 1904. The track plates 1904 have guide grooves that cooperate with the movement trajectory of the combined track 18. The guide grooves include an upper straight groove 19041, a lower straight groove 19042, and a transition arc groove. The upper straight groove 19041 is located on the side of the lower straight groove 19042 away from the interior of the mobile chassis 1. The upper straight groove 19041 and the lower straight groove 19042 are connected by the transition arc groove. The guide grooves have a clearance circumferential seam 19043 for the connecting rod 1902 to pass through. The end of the connecting rod 1902 away from the hoe plate 1901 has a guide ball 1905 that cooperates with the guide groove. The diameter of the guide ball 1905 is larger than the width of the clearance circumferential seam 19043. The cooperation of the guide grooves and the guide ball 1905 ensures the stability of the connecting rod 1902 during movement, thereby enabling the hoe plate 1901 to accurately switch between working, stowage, and transition states.

[0039] The control module includes a communication component and a control terminal. The communication component can be a wireless communication module, such as a Bluetooth module or a WiFi module, and the control terminal can be a handheld terminal or a remote control center. The control terminal allows remote control of the movement of the mobile chassis 1 and the lifting action of the electric jack assembly, improving operational convenience and flexibility.

[0040] The implementation principle of a field-mobile jack according to an embodiment of this application is as follows: The field-mobile jack of this embodiment achieves basic mobility through a mobile chassis 1. The drive wheel 2 uses a sprocket in conjunction with a combined track 18, improving its passability in complex terrain. The electric jack assembly drives an oil pump via a drive motor, pressurizing hydraulic oil into the cylinder 3, thereby driving the composite lifting arm structure to perform lifting actions. The combined track 18 and reinforcing section 1804 of the track module enhance the strength and stability of the track. The spade plate 1901 of the deployed module 19 provides better support and stability in the working state and reduces space occupation in the folded state. The cooperation of the track plate 1904 and the guide groove ensures the accuracy of the spade plate 1901's state transition. The control module allows operators to control the jack from a certain distance, avoiding direct operation in dangerous or inaccessible environments. Compared with existing technologies, the jack in this embodiment is more convenient to move in the field, has a stronger ability to adapt to complex terrain, is more convenient and safer to operate, and improves work efficiency and scope of use.

[0041] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A jack that is easy to move in the field, characterized in that, include: A mobile chassis (1) equipped with drive wheels (2); An electric jack assembly is mounted on the mobile chassis (1); Track module, the track module includes two combined tracks (18), the combined tracks (18) are rotatably connected to the drive wheels (2) located on both sides of the mobile chassis (1); The deployment module (19) includes a spade plate (1901), which is rotatably connected to the combined track (18) via a transmission assembly. The spade plate (1901) has a working state arranged in a horizontal direction, a storage state arranged in a vertical direction, and a transition state between the two states. When the spade plate (1901) moves with the combined track (18) to a position where the combined track (18) is close to the ground... When the spade plate (1901) is in the working state, when the spade plate (1901) moves with the combined track (18) to the side of the combined track (18) away from the ground, the spade plate (1901) is in the stored state, and when the spade plate (1901) moves with the combined track (18) to the corner position between the combined track (18) and the drive wheel (2), the spade plate (1901) is in the transition state.

2. The jack that is easy to move in the field according to claim 1, characterized in that, It also includes a control module, which includes a communication component and a control terminal. The communication component is simultaneously connected to the electric jack assembly and the mobile chassis (1) via signal.

3. The automatic alignment device for an electric jack according to claim 1, characterized in that, The electric jack assembly includes an oil pump, an oil tank, a composite lifting arm structure, and a drive motor. The drive motor is driven and connected to the oil pump. The input end of the oil cylinder (3) is connected to the output end of the oil pump. The input end of the oil pump is connected to the oil tank. The output end of the oil cylinder (3) is driven and connected to the composite lifting arm structure to drive the composite lifting arm structure.

4. The automatic alignment device for an electric jack according to claim 3, characterized in that, The hydraulic cylinder (3) is horizontally positioned on top of the movable chassis (1); The composite lifting arm structure includes: A pair of support plates (4) are arranged symmetrically along the extension and retraction direction of the oil cylinder (3) and the support plates (4) are fixedly connected to the top of the mobile chassis (1). The lifting arm body (5) includes a long arm (501) and a short arm (502) arranged perpendicularly to each other. The lifting arm body (5) is rotatably connected to the support plate (4) through a lifting arm shaft (6). The lifting arm shaft (6) is connected at the junction of the long arm (501) and the short arm (502). The lifting arm shaft (6) is perpendicular to the support plate (4). One end of the long arm (501) away from the short arm (502) is connected to a top support (8) through a first rotating shaft (7). A pair of pull rods (9) are symmetrically arranged along the plane of symmetry of the support plate (4). One end of one of the pull rods (9) is rotatably connected to one of the pair of support plates (4) through the pull rod (9) axis, and the other end is rotatably connected to one side of the top support (8) through the second rotating shaft (11). The pull rod (9) axis and the second rotating shaft (11) are both parallel to the lifting arm axis (6). The traction frame (12) is fixedly connected to the output end of the oil cylinder (3). The two ends of the traction frame (12) are respectively rotatably connected to traction rods (13). The end of the traction rod (13) away from the traction frame (12) is rotatably connected to the end of the short arm (502) away from the long arm (501) through a third rotating shaft (14).

5. The automatic alignment device for an electric jack according to claim 4, characterized in that, The line connecting the lifting arm shaft (6) and the pull rod (9) shaft is parallel to the horizontal direction. The center distance between the lifting arm shaft (6) and the first rotating shaft (7) is equal to the center distance between the pull rod (9) shaft and the second rotating shaft (11).

6. The automatic alignment device for an electric jack according to claim 4, characterized in that, The support plates (4) are provided with a slide rail (15) arranged in the horizontal direction on one side close to each other, and the traction frame (12) is provided with sliders (16) at both ends that cooperate with the slide rail (15).

7. The jack that is easy to move in the field according to claim 4, characterized in that, The bottom of the top support (8) on the side away from the first rotating shaft (7) is provided with digging teeth (17).

8. The jack that is easy to move in the field according to claim 1, characterized in that, The drive wheel (2) is a sprocket. The combined track (18) includes two chain links arranged side by side at intervals. One end of the chain link engages with one of the drive wheels (2) on one side of the mobile chassis (1), and the other end of the chain link engages with the other drive wheel (2) on one side of the mobile chassis (1). The chain link includes multiple chain plates (1801). Any two adjacent chain plates (1801) are connected by track plates (1802). The track plates (1802) are rotatably connected to the chain plates (1801) by track pins (1803). The track plates (1802) are located on the side of the chain links that are far apart from each other. Between two chain links, there are reinforcing sections (1804) that are equal in number and correspond one-to-one with the track plates (1802) in a single chain link. The left and right ends of the reinforcing sections (1804) are rotatably connected to the track pins (1803) at the corresponding positions.

9. The jack that is easy to move in the field according to claim 8, characterized in that, The number of the unfolding modules (19) is equal to the number of the reinforcing sections (1804) and they correspond one-to-one. The transmission assembly includes a connecting rod (1902) extending parallel to the track pin (1803). A groove (18041) is provided on the side of the reinforcing section (1804) near the inside of the chain link. The connecting rod (1902) is slidably connected to the groove (18041). The spade plate (1901) has a fourth rotating shaft (19011) and a fifth rotating shaft that are parallel to each other on one side. Both the fourth rotating shaft (19011) and the fifth rotating shaft are perpendicular to the connecting rod (1902), and the fifth rotating shaft is located on the side of the fourth rotating shaft (19011) away from the inside of the chain link. The fourth rotating shaft (19011) is connected to the end of the connecting rod (1902) away from the movable chassis (1) via a hinge plate (1903). The fifth rotating shaft is hinged to the side of one of the two corresponding track plates (1802) that is away from the mobile chassis (1) away from the mobile chassis (1).

10. The jack that is easy to move in the field according to claim 8, characterized in that, The mobile chassis (1) is provided with track plates (1904) on both sides. The track plates (1904) are provided with guide grooves that cooperate with the movement trajectory of the combined track (18). The guide grooves include an upper straight groove (19041), a lower straight groove (19042), and a transition arc groove. The upper straight groove (19041) is located on the side of the lower straight groove (19042) away from the interior of the mobile chassis (1). The upper straight groove (19041) and the lower straight groove (19042) are connected by the transition arc groove. The guide grooves are provided with a clearance ring gap (19043) for the connecting rod (1902) to pass through. The end of the connecting rod (1902) away from the spade plate (1901) is provided with a guide ball (1905) that cooperates with the guide groove. The diameter of the guide ball (1905) is larger than the width of the clearance ring gap (19043).

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