Electric lifting jack

Abstract

The invention relates to an electric lifting jack, and belongs to the technical field of jacks. Comprising a lifting mechanism, a hydraulic mechanism and an electric mechanism, the lifting mechanism is hinged to an extension rod of the hydraulic mechanism, a jacking head is arranged at the other end of the lifting mechanism, and the hydraulic mechanism comprises an ejection hydraulic cylinder and a piston movably connected with the ejection hydraulic cylinder; the electric mechanism comprises a swing motor and a rotating disc arranged on the swing motor, a linkage mechanism is arranged on the piston and rotationally connected with the rotating disc, the hydraulic mechanism is arranged between the two frames and rotationally connected with the lifting mechanism, and the electric mechanism is electrically connected with the controller. And the electric mechanism pushes the piston to reciprocate to push the lifting mechanism to rotate to a specified working state. The electric jack has the effects that a traditional manual pressing mode is replaced by an electric mode, and the lifting stability and the use safety of the jack are improved.

Description

Technical Field

[0001] This application relates to the field of jack design, and in particular to an electric lifting jack. Background Technology

[0002] With the continuous development of industry, the application scenarios of hydraulic jacks are becoming increasingly widespread, covering many fields such as automobile repair, construction, and bridge maintenance. They can lift heavy objects, providing convenience for various operations, greatly improving work efficiency, reducing labor intensity, and playing an irreplaceable role in ensuring the smooth progress of projects and improving production quality. In related technologies, to lift heavy objects using hydraulic jacks, manual operation is often employed, relying on repeated manual pressing of the handle to make hydraulic oil flow within the hydraulic cylinder, thereby pushing the piston rod upward to complete the lifting action.

[0003] Regarding the aforementioned technologies, the inventors believe that manually operating and controlling the lifting and lowering of jacks requires a large amount of manpower and time, resulting in high labor intensity and low work efficiency. Summary of the Invention

[0004] To simplify the use of jacks and improve the user experience of shallow jacks, this application provides an electric lifting jack.

[0005] This application provides an electric lifting jack, which adopts the following technical solution: An electric lifting jack includes a lifting mechanism, a hydraulic mechanism, and an electric mechanism. The lifting mechanism is hinged to the extension rod of the hydraulic mechanism. The other end of the lifting mechanism is provided with a lifting head. The hydraulic mechanism includes a lifting hydraulic cylinder and a piston movably connected to the lifting hydraulic cylinder. The electric mechanism includes a swing motor and a rotating disk mounted on the swing motor. The piston is provided with a linkage mechanism rotatably connected to the rotating disk. The hydraulic mechanism is located between two sets of frame panels and is rotatably connected to the lifting mechanism. The electric mechanism is electrically connected to a controller. During operation, the electric mechanism drives the piston to reciprocate, and the hydraulic mechanism drives the lifting mechanism to rotate to a designated working state.

[0006] By adopting the above technical solution, the hydraulic mechanism is installed horizontally between two sets of frames. The output end of the hydraulic mechanism controls the rotation of the lifting mechanism to change the height difference between the lifting head and the frame, so that the jack device can adapt to lifting at different heights from a horizontal position. The hydraulic mechanism is connected to the rotating disk through a linkage mechanism. After receiving the control signal, the swing motor swings continuously, driving the rotating disk to swing back and forth around the output shaft of the swing motor, which in turn drives the piston connected to the linkage mechanism to move back and forth, thereby driving the hydraulic mechanism to push the lifting mechanism to change the specific placement height of the lifting head, so as to establish support control for vehicles or other heavy objects of different heights. Electric control replaces the manual control of hydraulic output in the existing technology, freeing the user's hands and reducing the difficulty of use.

[0007] Optionally, the lifting mechanism includes a support housing, a central frame is provided in the inner cavity of the support housing, a hinge column is provided at the middle end of the support housing, the hinge column rotatably abuts against multiple sets of bogies, and one end of the bogie abuts against the central frame and the support housing respectively.

[0008] By adopting the above technical solution, the bogie rotates on the hinge column under force. The hinge column is fixedly connected to the frame and serves as the rotation support shaft between the bogie and the support housing. Under the cooperation of the push frame and the moving frame, the support housing changes its setting angle, thereby changing the height of the top of the support housing to control the support lifting at different heights. Since the support housing is hinged with the bogie and the moving frame, the moving frame drives the support housing and the bogie to rotate synchronously. The mounting base is then hinged to the frame through the coordination frame. That is, no matter how the extension of the hydraulic mechanism changes, only the setting height of the mounting base will change macroscopically, and the placement angle of the mounting base will not change, so that the lifting head always maintains a positive upward installation state.

[0009] Optionally, a set of movable frames is provided on both sides of the ejector hydraulic cylinder, and a set of first rotating pins is provided on each movable frame. The other end of the steering frame is rotatably connected to a set of first rotating pins. The outer ends of the first rotating pins are rotatably connected to the support housing. The movable frames are all fixedly connected to the push frame, and the push frame is fixedly connected to the extension rod.

[0010] By adopting the above technical solution, the ejector hydraulic cylinder drives the moving frame and the pusher frame to extend through the extension rod. The support housing and the bogie that act on the moving frame rotate around the first rotating pin to change the installation angle, so as to support the lifting head to different heights and achieve lifting support.

[0011] Optionally, the top of the support housing is provided with a mounting base, the lifting head is mounted on the mounting base and rotatably connected to the mounting base, the mounting base is provided with a ball joint structure, the ball joint structure includes a base, a ball seat and a ball head, the lifting head is provided with a connecting pin in the center, and the connecting pin is connected to the ball head.

[0012] By adopting the above technical solution, the lifting mechanism uses a support shell to establish a connection with the mounting base. The lifting head adjusts the connection angle between the ball head and the ball seat. The ball seat limits the ball head to rotate within 3 degrees. While ensuring the lifting stability of the lifting head, the lifting head can be adapted to support the undercarriage of a vehicle or other heavy objects in a certain degree of inclination.

[0013] Optionally, the ejection hydraulic cylinder includes a hydraulic cylinder body and a protective housing, with a heat insulation layer between the hydraulic cylinder body and the protective housing, and a heat dissipation component on the protective housing.

[0014] By adopting the above technical solution, hydraulic displacement is generated in the hydraulic cylinder body to push the extension rod to move. A protective shell is set to limit the installation of the hydraulic cylinder body and to provide installation space and position for the heat insulation layer and heat dissipation components.

[0015] Optionally, the heat insulation layer includes two high-temperature glass fiber layers, with an aerogel felt layer between the two sets of high-temperature glass fiber layers, and the heat dissipation component is a wrapped polished aluminum foil.

[0016] By adopting the above technical solution, the high-temperature glass fiber layer has a good heat insulation effect. It has low density and high strength. While insulating the hydraulic cylinder body, it can enhance the structural strength of the hydraulic cylinder body. The aerogel felt layer has a good heat insulation effect and can help the high-temperature glass fiber layer prevent the temperature from having a negative impact on the use of the hydraulic cylinder body in hot weather.

[0017] Optionally, a heating wire layer is provided between the hydraulic cylinder body and the heat insulation layer, and the heating wire layer is in contact with the hydraulic cylinder body.

[0018] By adopting the above technical solutions, the high-temperature glass fiber and aerogel felt layer also have good heat preservation effect. When the heating wire layer is used to heat the oil in the hydraulic cylinder body in extremely cold environments, the heat insulation layer can prevent heat loss, effectively ensure the heating effect of the heating wire, and save energy.

[0019] Optionally, the linkage mechanism includes a connecting sleeve disposed on the piston, the connecting sleeve being fixedly connected to the piston, and a second connecting post disposed on the connecting sleeve, the second connecting post being disposed inside the second connecting ball ring.

[0020] By adopting the above technical solution, the connecting sleeve is fixedly connected to the piston, and the connecting sleeve is rotatably connected to the second connecting ball ring through the second connecting post. The second connecting post can rotate within the second connecting ball ring. While ensuring the linkage effect of the second connecting ball ring on the connecting sleeve, it does not affect the influence of the swing motor on the angle control of the rotating disk on the connecting sleeve. It converts the angular displacement of the swing disk on the push-pull rod into the linear displacement of the connecting sleeve, so as to drive the piston to reciprocate and ensure the stable increase of hydraulic pressure inside the hydraulic cylinder body.

[0021] Optionally, the linkage mechanism further includes a push-pull rod and a first connecting ball ring. The first connecting ball ring is fixedly connected to one end of the push-pull rod, and the second connecting ball ring is fixedly connected to the other end of the push-pull rod. The first connecting ball ring is provided with a first connecting post, and the other end of the first connecting post is fixedly connected to the rotating disk.

[0022] By adopting the above technical solution, the second connecting ball ring is located at one end of the push-pull rod, and the first connecting ball ring is located at the other end of the push-pull rod. The rotating disk drives the first connecting column to swing, and the first connecting column moves within the first connecting ball ring, converting the angular displacement into linear displacement, so that the push-pull rod pulls the movable sleeve to achieve reciprocating motion.

[0023] Optionally, the bottom outer end of the frame is provided with a groove, and the groove is provided with gripping teeth. The gripping teeth include a lifting frame and multiple sets of grounding posts at the bottom of the lifting frame. The bottom of each grounding post is provided with anti-slip serrations.

[0024] By adopting the above technical solution, each set of slots is equipped with gripping teeth and auxiliary jacks that contact the ground. The gripping teeth drive multiple sets of grounding posts to move vertically through the lifting frame. The inner cavity of the lifting frame is equipped with elastic elements that connect to the grounding posts, so that the jacks can adapt to a certain degree of unevenness or muddy road surfaces for support.

[0025] In summary, this application includes at least one of the following beneficial technical effects: An electric lifting jack has a piston installed at the adjusting end of the hydraulic cylinder and is controlled by an electric mechanism to move the piston back and forth, which drives the oil inside the hydraulic cylinder to be stably filled into the oil pipe. While ensuring the stable lifting of the lifting head, it replaces the traditional manual pressing operation to free up manual labor, improve the user experience of the jack, and lower the operation threshold. The electric system is equipped with a complete protection circuit, which will automatically lock when the load reaches the rated value and stop the piston from moving, thereby improving the safety of the jack. This application establishes a rotating connection by setting a connecting column inside the ball ring on the linkage mechanism, which eliminates the influence of the angular change caused by the swing motor driving the rotating disk on the first connecting column and the push-pull rod on the second connecting column, and converts the circumferential displacement of the rotating disk into the linear displacement of the push-pull rod, thereby driving the piston rod to reciprocate and control the filling of oil in the hydraulic cylinder body. This process is entirely controlled by the up button, and has a high degree of automation. This application provides a heat insulation layer and a heat dissipation layer on the ejector hydraulic cylinder, which can minimize the impact of external heat on the oil pressure inside the ejector hydraulic cylinder under hot conditions, and also enhance the structural strength of the hydraulic cylinder body, preventing the pressure difference of the oil flow from having a negative impact on its body structure. The heating wire layer can heat the oil under extremely cold conditions, and the heat insulation layer can prevent heat loss, effectively ensuring the heating effect of the heating wire and saving energy. This application designs a ball joint structure at the connection of the lifting head that allows for slight angle adjustment. By utilizing the slight linkage between the ball head and the ball seat, the direction of the lifting head can be changed within a certain range, enabling the jack to support slightly tilted heavy objects. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the electric jack according to an embodiment of this application; Figure 2 This is a schematic diagram of the connection structure between the lifting mechanism and the hydraulic mechanism of the electric jack in an embodiment of this application; Figure 3 yes Figure 1 Sectional view along the middle AA direction; Figure 4 yes Figure 3 Enlarged view of section B; Figure 5 yes Figure 3 Enlarged view of section C; Figure 6 yes Figure 1 A schematic diagram of the structure after removing a set of borders; Figure 7 yes Figure 6 Enlarged view of section D in the middle; Figure 8 yes Figure 7 Disassembly diagram after removing the push-pull rod; Figure 9 This is a schematic diagram of the connection structure of the gripping teeth of the electric jack in an embodiment of this application.

[0027] Explanation of reference numerals in the attached drawings: 1. Lifting mechanism; 11. Support housing; 111. First rotating pin; 12. Mounting seat; 121. Second rotating pin; 13. Coordinating frame; 131. Third rotating pin; 14. Center frame; 15. Bogie; 16. Hinge column; 2. Lifting head; 21. Connecting pin; 22. Balance frame; 23. Ball head; 24. Ball seat; 25. Base; 26. Strong spring; 3. Hydraulic mechanism; 31. Ejection hydraulic cylinder; 311. Hydraulic cylinder body; 312. Protective housing; 313. Locking valve; 314. Oil unloading buckle; 3101. High-temperature glass fiber layer; 3102. Aerogel felt layer; 3103. Heating wire layer; 3104. Polished aluminum foil; 32. Extending rod; 33. Moving frame; 34. Push frame; 35. Balance spring; 36. Hook; 37. Connecting seat; 38. Connecting sleeve; 39. Piston; 4. Electric mechanism; 41. Protective plate; 42. Swing motor; 43. Rotating disk; 44. First connecting post; 45. First connecting ball ring; 46. Push-pull rod; 47. Second connecting ball ring; 48. Second connecting post; 5. Handle; 51. Grip; 52. Lifting button; 53. Main switch; 6. Frame; 61. Reference plate; 7. Setting slot; 71. Locking knob; 72. Adjusting gear; 73. Lifting rack; 74. Lifting frame; 75. Grounding post. Detailed Implementation

[0028] The following is in conjunction with the appendix Figure 1-9 This application will be described in further detail.

[0029] This application discloses an electric lifting jack, as shown in the embodiments below. Figure 1 It includes a lifting mechanism 1, a hydraulic mechanism 3, and an electric mechanism 4. The other end of the lifting mechanism 1 is provided with a lifting head 2. The hydraulic mechanism 3 is located between two sets of frame 6 and is rotatably connected to the lifting mechanism 1. The electric mechanism 4 is electrically connected to the controller. The two sets of frame 6 limit the installation of the hydraulic mechanism 3. When working, the electric mechanism 4 pulls the piston 39 to reciprocate, controls the hydraulic mechanism 3 to fill with oil and pushes the lifting mechanism 1 to rise, changing the specific working height of the lifting head 2 to the specified working state.

[0030] Reference Figure 2 and Figure 3The lifting mechanism 1 includes a support housing 11, with a central frame 14 inside the support housing 11 and a hinge column 16 at the middle end of the support housing 11. The hinge column 16 rotatably abuts against the bogie 15. In this embodiment, the bogie 15 is provided in two sets and is respectively located on both sides of the hydraulic cylinder body 311. A cavity is provided between the central frame 14 and the support housing 11. One end of each set of bogies 15 is placed in the cavity and abuts against the central frame 14 and the support housing 11 respectively. The bottom of the two sets of bogies 15 is subjected to a thrust and generates a linear displacement, which changes the turning abutment angle between them and the hinge column 16, thereby pushing the support housing 11 and the central frame 14 to change their setting angle, so as to drive the lifting head 2 to generate a height displacement.

[0031] The hydraulic mechanism 3 includes an ejector hydraulic cylinder 31, an extension rod 32, a moving frame 33, and a pusher frame 34. The other ends of the two sets of bogies 15 are rotatably connected to the moving frame 33 through a set of first rotating pins 111. The moving frame 33 is fixedly connected to the pusher frame 34 through connecting pins. The pusher frame 34 is fixedly connected to the extension rod 32. That is, controlling the ejector hydraulic cylinder 31 controls the movement of the extension rod 32, so that the moving frame 33 drives the support housing 11 and the variable set bogies 15 to generate linkage, thereby changing the setting angle of the support housing 11.

[0032] The hydraulic mechanism 3 has a connecting seat 37 at the end away from the extension rod 32. Two sets of balance springs 35 on the connecting seat 37 are fixedly connected to the housing of the ejector hydraulic cylinder 31 through a set of hooks 36. During the process of the ejector hydraulic cylinder 31 being controlled by the reciprocating pull of the piston 39 to control the flow of oil, the hydraulic pressure will have a certain stress effect on the ejector hydraulic cylinder 31. The two sets of balance springs 35 can eliminate these stress effects and prevent the ejector hydraulic cylinder 31 from deforming, so as to ensure the service life and stability of the ejector hydraulic cylinder 31.

[0033] The top of the support housing 11 is provided with a shaft pin that is rotatably connected to the mounting base 12. The mounting base 12 is also provided with a second rotating pin 121. The second rotating pin 121 is provided with a coordinating frame 13. The other end of the coordinating frame 13 is rotatably connected to the frame 6 through a set of third rotating pins 131. That is, during the process of the support housing 11 driving the mounting base 12 to rotate, the angle of the frame 6 and the coordinating frame 13 is adjusted, so that the mounting base 12 always maintains a parallel placement in a macroscopic sense.

[0034] Reference Figure 4The lifting head 2 is mounted on the mounting base 12 and rotatably connected to the mounting base 12. The mounting base 12 has a ball joint structure, which includes a base 25, a ball seat 24, and a ball head 23. The lifting head 2 has a connecting pin 21 in the center, which is connected to the ball head 23. The bottom of the connecting pin 21 is also provided with a balance frame 22. The ball head 23 passes through the balance frame 22 and is rotatably connected to the ball seat 24. The ball seat 24 is fixedly mounted on the base 25. The bottom of the balance frame 22 is provided with several strong springs 26 that extend to the base 25. When the lifting head 2 contacts the supported heavy object, if it comes into contact with an irregular surface, the force exerted on different parts of the lifting head 2 at the contact end will be different, which may cause the risk of slippage. The lifting head 2 changes the connection angle between the ball head 23 and the ball seat 24 by uneven force, and sets the ball seat 24 to limit the rotation of the ball head 23 to within 3 degrees, thereby eliminating the risk of slippage. While ensuring the lifting stability of the lifting head, the lifting head 2 can be used to support the undercarriage of a vehicle or other heavy objects in a certain tilt state.

[0035] While the lifting head 2 generates angular displacement, multiple sets of strong springs 26 ensure its support stability, preventing the lifting head 2 from generating larger angular displacement due to tilted contact. Furthermore, the contact angle of the lifting head 2 can be quickly adjusted when the tilted surface is removed or the angle is changed, thereby improving the practicality of the lifting head 2.

[0036] Reference Figure 5 The ejector hydraulic cylinder 31 includes a hydraulic cylinder body 311 and a protective shell 312. A heat insulation layer is provided between the hydraulic cylinder body 311 and the protective shell 312. In this embodiment, the heat insulation layer includes two high-temperature glass fiber layers 3101. The high-temperature glass fiber structure has a good heat insulation effect and has the properties of low density and high strength. While insulating the hydraulic cylinder body, it can also enhance the structural strength of the hydraulic cylinder body. An aerogel felt layer 3102 is provided between the two sets of high-temperature glass fiber layers 3101. The aerogel felt structure has a good heat insulation effect and can assist the high-temperature glass fiber structure to prevent the temperature in hot weather from having a negative impact on the use of the hydraulic cylinder body 311. A heat dissipation component is provided on the protective shell 312. In this embodiment, the heat dissipation component is a wrapped polished aluminum foil 3104. The polished aluminum foil has a good effect of reflecting heat radiation and preventing heat absorption, thus establishing a first-layer protection mechanism to avoid the negative impact of external high temperature on the hydraulic cylinder body 311.

[0037] A heating wire layer 3103 is provided between the hydraulic cylinder body 311 and the heat insulation layer. The heating wire layer 3103 is in contact with the hydraulic cylinder body 311. When the heating wire layer 3103 is used to heat the oil in the hydraulic cylinder body 311 in extremely cold environments, it ensures that the hydraulic cylinder body 311 can be put into normal use. The heat insulation layer can prevent heat loss and effectively ensure the heating effect of the heating wire layer 3103, saving energy.

[0038] Reference Figure 5 and Figure 6 The hydraulic mechanism 3 has a locking valve 313 at the input end of the piston 39. The locking valve 313 is connected to the oil unloading buckle 314 and both are located in the connecting seat 37. The other end of the oil unloading buckle 314 is installed on the connecting end that is hinged to the frame 6. The connecting end is provided with a handle 5. The handle 5 also has a grip 51, a lifting button 52, a main switch 53, a locking button, and an unlocking button. In this embodiment, the locking button and the unlocking button are located on the panel of the handle 5 near the lifting mechanism 1 (not shown in the figure). Pressing the main switch 53 turns on the controller. Pressing the locking button again causes the oil unloading buckle 314 to support the locking valve 313 to extend, closing the oil unloading channel. Pressing the lifting button 52 again can control the lifting head 2 to continue to rise. When pressure needs to be released, pressing the unlocking button causes the oil unloading buckle 314 to drive the locking valve 313 to retract, connecting the oil unloading channel. The hydraulic mechanism 3 controls the lifting mechanism 1 to descend, and the lifting head 2 to descend. Using electric control can eliminate the traditional manual button method of lifting the lifting head 2, freeing up the hands and reducing the difficulty of using the jack.

[0039] Reference Figures 5 to 8 The electric mechanism 4 includes a swing motor 42, and the edge of the rotating disk 43 is located on the output shaft of the swing motor 42. The bottom of the swing motor 42 is mounted on the protective plate 41 via a foot bracket. The protective plate 41 can prevent road pollutants from having a negative impact on the electric mechanism 4 and establish the support relationship between the frame 6 and the electric mechanism 4.

[0040] The ejector hydraulic cylinder 31 is movably connected to the piston 39 through the connecting channel of the connecting seat 37. The piston 39 is connected to the electric mechanism 4 through a linkage mechanism. The linkage mechanism includes a connecting sleeve 38, a second connecting ball ring 47, a push-pull rod 46, and a first connecting ball ring 45. The connecting sleeve 38 is fixedly connected to the piston 39. The connecting sleeve 38 is provided with a second connecting post 48, which is located inside the second connecting ball ring 47 and rotatably connected to the second connecting ball ring 47. The first connecting ball ring 45 is fixedly connected to one end of the push-pull rod 46, and the second connecting ball ring 47 is fixedly connected to the other end of the push-pull rod 46. The first connecting ball ring 45 is provided with a first connecting post 44. The other end of the connecting post 44 is fixedly connected to the rotating disk 43. The swing motor 42 swings, causing the rotating disk 43 to generate a circumferential displacement in the upper half of the swing motor 42. The rotating disk 43 drives the push-pull rod 46 and the second connecting post 48 to move through the first connecting post 44. Since the first connecting ball ring 45 will eliminate the angular influence generated by the first connecting post 44, and the second connecting ball ring 47 will eliminate the angular influence generated by the second connecting post 48, the linkage mechanism converts the circumferential displacement generated by the rotating disk 43 into the linear movement of the action connecting sleeve 38, so as to drive the piston 39 to reciprocate, draw oil into the pipeline of the hydraulic cylinder, drive the extension rod 32 to extend, and control the movement of the lifting mechanism 1.

[0041] The first connecting ball ring 45 includes a connecting cavity for limiting the first connecting post 44 and a rolling post disposed inside the connecting cavity. The first connecting post 44 rotates in the connecting cavity under the force of the rotating disk 43, which drives the first connecting ball ring 45 to produce linear displacement. The rotation effect is eliminated by the movable connection between the connecting cavity and the first connecting post 44. The second connecting ball ring 47 has the same structural design as the first connecting ball ring 45 to unify the connection mode of the rotating parts, which facilitates the production or replacement of damaged parts.

[0042] A reference plate 61 is provided between the bottom of the support housing 11 and the handle 5 on the frame 6. This plate can effectively limit the rotation range of the support housing 11 and provide storage support for the handle 5 during storage, so as to ensure the stability of the steering connector on the handle 5. A light strip is provided on the reference plate 61. The light strip is electrically connected to the control terminal and can be turned on for auxiliary lighting during operation.

[0043] Reference Figure 1 and Figure 9 The outer ends of the two sets of frame 6 are respectively provided with guide wheels and power wheels, which can drive the jack to move to the working position. The bottom outer ends of the frame 6 are respectively provided with a set of setting grooves 7. Each set of setting grooves 7 is provided with a set of locking knobs 71 at both ends. The setting grooves 7 are provided with gripping teeth. Each end of the gripping teeth is provided with a set of lifting racks 73. The tooth grooves of the lifting racks 73 are respectively meshed with a set of adjusting gears 72. The adjusting gears 72 are fixedly connected to the locking knobs 71. The gripping teeth include a lifting frame 74 and multiple sets of grounding posts 75 at the bottom of the lifting frame 74. The bottom of the grounding posts 75 is provided with anti-slip serrations. Rotating the locking knobs 71 can control the adjusting gears 72 to control the specific height of the lifting racks 73 meshing with them, and can adjust the lifting frame 74 to drive the grounding posts 75 to contact the ground. Both sets of adjusting gears 72 and lifting racks 73 have small gaps, and the length of the lifting frame 74 is much larger than the outer diameter of the adjusting gears 72. Within a certain range, the two sets of locking knobs 71 on the same set of mounting slots 7 can be rotated to different fixed angles, so that the two sets of gripping teeth are placed at a slightly tilted angle. The mounting ends of the grounding posts 75 are each provided with independent rubber posts, so that most of the grounding posts 75 can establish a connection with the contact surface, which is suitable for use on sloping or muddy roads.

[0044] The implementation principle of an electric lifting jack in this embodiment is as follows: The jack is placed in the designated working position. At this time, the lifting mechanism 1 is placed horizontally between the two sets of frame 6. The handle 5 is pulled out to a suitable position. The main switch 53 is pressed to turn on the controller. Then, the locking button is pressed, the oil unloading buckle 314 supports the locking valve 313 to extend, and the oil unloading channel is closed. Then, the lifting button 52 is pressed, and the lifting signal is generated from the control end to the swing motor 42. The swing motor 42 swings, driving the rotating disk 43 to reciprocate in the upper half of the swing motor 42. Pulling the push rod 46 drives the two sets of pistons 39 in the connecting sleeve 38 to continuously draw oil from the inner cavity of the hydraulic cylinder into the oil pipe. The extended rod 32 pushes out and drives the support housing 11 and the bogie 15 to rotate, supporting the lifting head 2 on the mounting seat 12 to rise continuously. After the lifting operation is completed, the unlock button is pressed, the oil unloading buckle 314 drives the locking valve 313 to retract, connecting the oil unloading channel. The oil slowly flows back from the oil pipe to the inner cavity of the hydraulic cylinder, driving the extended rod 32 to retract into the hydraulic cylinder body 311. The lifting mechanism 1 descends to the horizontal position, and the lifting head 2 retracts into the frame 6.

[0045] 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. An electric lifting jack, characterized in that, The device includes a lifting mechanism (1), a hydraulic mechanism (3), and an electric mechanism (4). The lifting mechanism (1) is hinged to the extension rod (32) of the hydraulic mechanism (3). The other end of the lifting mechanism (1) is provided with a lifting head (2). The hydraulic mechanism (3) includes a push-out hydraulic cylinder (31) and a piston (39) movably connected to the push-out hydraulic cylinder (31). The electric mechanism (4) includes a swing motor (42) and a rotating disk (43) on the swing motor (42). The piston (39) is provided with a linkage mechanism that is rotatably connected to the rotating disk (43). The hydraulic mechanism (3) is located between two sets of frame (6) and is rotatably connected to the lifting mechanism (1). The electric mechanism (4) is electrically connected to the controller. When working, the electric mechanism (4) pushes the piston (39) to reciprocate, and the hydraulic mechanism (3) pushes the lifting mechanism (1) to rotate to the specified working state.

2. The electric lifting jack according to claim 1, characterized in that, The lifting mechanism (1) includes a support housing (11), the inner cavity of which is provided with a central frame (14), and the middle end of the support housing (11) is provided with a hinge column (16). The hinge column (16) rotates and abuts against multiple sets of bogies (15), and one end of the bogie (15) abuts against the central frame (14) and the support housing (11) respectively.

3. The electric lifting jack according to claim 2, characterized in that, The ejector hydraulic cylinder (31) is provided with a set of movable frames (33) on both sides. The movable frames (33) are provided with a set of first rotating pins (111). The other end of the steering frame (15) is rotatably connected to a set of first rotating pins (111). The outer ends of the first rotating pins (111) are rotatably connected to the support housing (11). The movable frames (33) are all fixedly connected to the push frame (34). The push frame (34) is fixedly connected to the extension rod (32).

4. The electric lifting jack according to claim 2, characterized in that, The top of the support housing (11) is provided with a mounting base (12), the lifting head (2) is mounted on the mounting base (12) and rotatably connected to the mounting base (12), the mounting base (12) is provided with a ball joint structure, the ball joint structure includes a base (25), a ball seat (24) and a ball head (23), the lifting head (2) is provided with a connecting pin (21) in the center, and the connecting pin (21) is connected to the ball head (23).

5. An electric lifting jack according to claim 1, characterized in that, The ejection hydraulic cylinder (31) includes a hydraulic cylinder body (311) and a protective shell (312). A heat insulation layer is provided between the hydraulic cylinder body (311) and the protective shell (312), and a heat dissipation component is provided on the protective shell (312).

6. An electric lifting jack according to claim 5, characterized in that, The heat insulation layer includes two high-temperature glass fiber layers (3101), and an aerogel felt layer (3102) is provided between the two sets of high-temperature glass fiber layers (3101). The heat dissipation component is a wrapped polished aluminum foil (3104).

7. An electric lifting jack according to claim 5, characterized in that, A heating wire layer (3103) is provided between the hydraulic cylinder body (311) and the heat insulation layer, and the heating wire layer (3103) is in contact with the hydraulic cylinder body (311).

8. An electric lifting jack according to claim 1, characterized in that, The linkage mechanism includes a connecting sleeve (38) disposed on the piston (39), the connecting sleeve (38) being fixedly connected to the piston (39), and a second connecting post (48) disposed on the connecting sleeve (38), the second connecting post (48) being disposed inside the second connecting ball ring (47).

9. An electric lifting jack according to claim 8, characterized in that, The linkage mechanism further includes a push-pull rod (46) and a first connecting ball ring (45). The first connecting ball ring (45) is fixedly connected to one end of the push-pull rod (46), and the second connecting ball ring (47) is fixedly connected to the other end of the push-pull rod (46). The first connecting ball ring (45) is provided with a first connecting post (44), and the other end of the first connecting post (44) is fixedly connected to the rotating disk (43).

10. An electric lifting jack according to claim 1, characterized in that, The bottom outer end of the frame (6) is provided with a setting groove (7), and the setting groove (7) is provided with ground gripping teeth. The ground gripping teeth include a lifting frame (74) and multiple sets of grounding posts (75) provided at the bottom of the lifting frame (74). The bottom of the grounding posts (75) is provided with anti-slip serrations.

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