An electric lifting platform

Abstract

This utility model discloses an electric lifting platform, characterized by further including a valve seat mounted on a hydraulic cylinder, an electric pump mounted on the valve seat for driving the hydraulic cylinder to perform a lifting action, a driver for driving the drain valve on the valve block to actuate and cause the hydraulic cylinder to return oil and descend, a controller mounted on the base frame for controlling the electric pump and driver and electrically connected to the electric pump and driver, and a control button mounted on the handle and electrically connected to the controller. Through the inclusion of the electric pump and driver, the lifting platform, during lifting, is driven by the electric pump to lift the hydraulic cylinder, which in turn drives the scissor lift assembly and the platform to perform the lifting operation. During descent, the driver is activated, which in turn opens the drain valve and drives the lifting platform to descend. The lifting and lowering of the platform does not require manual operation, resulting in smooth lifting and low labor intensity.

Description

Technical Field

[0001] This utility model relates to a lifting platform, specifically an electric lifting platform. Background Technology

[0002] Existing lifting platforms are basically divided into two types: foot-operated hydraulic and electric. Foot-operated platforms use a foot pedal to pressurize the hydraulic pump, which pumps oil into the cylinder for lifting. Lowering is achieved through a pull-wire or rotary drain valve. The advantages of foot-operated hydraulic lifting platforms are that they are lightweight, easy for users to carry, and have low cost. The disadvantages are that they require users to operate them with their feet, which is time-consuming, labor-intensive, and has low work efficiency.

[0003] Currently available electric lifting platforms on the market use large-capacity battery packs for power, and drive and control the platform's raising and lowering through gear pumps and low-pressure solenoid valves. The advantages are that no manual foot operation is required, saving time and effort, high work efficiency, and long working hours, making them suitable for use in fixed locations such as workshops. However, the use of high-flow-rate lead-acid batteries results in large product size and weight, making them unsuitable for users to carry and operate. Furthermore, the use of large-capacity batteries, gear pumps, and low-pressure solenoid valves leads to high product costs and limited market practicality. Therefore, this paper proposes a convenient, labor-saving, and economical electric lifting platform. Utility Model Content

[0004] The purpose of this utility model is to provide an electric lifting platform to solve the above problems.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an electric lifting platform, comprising a base frame, a handle mounted on the base frame, casters mounted on the base frame, a scissor lift assembly mounted on the base frame, a platform mounted on the scissor lift assembly, and a hydraulic cylinder movably mounted at one end on the base frame and movably connected to the scissor lift assembly at the other end; characterized in that it further comprises a valve seat mounted on the hydraulic cylinder, an electric pump mounted on the valve seat for driving the hydraulic cylinder to perform a lifting action, a driver for driving the oil release valve on the valve block to perform an oil return and descent of the hydraulic cylinder, a controller mounted on the base frame for controlling the electric pump and the driver and electrically connected to the electric pump and the driver, and a control button mounted on the handle and electrically connected to the controller.

[0006] Further preferred options include a lithium battery electrically connected to the controller.

[0007] Further preferably, it also includes a safety mechanism to prevent the platform from suddenly dropping to the bottom. The safety mechanism includes a baffle mounted on the base frame for limiting the position and a protective rod that is rotatably mounted on the scissor lift assembly at one end by a pin and provides limiting support for the continuous downward movement of the scissor lift assembly when the other end abuts against the baffle. The scissor lift assembly is also provided with a limiting pin that provides limiting support for the position of the protective rod after it is raised.

[0008] More preferably, the hydraulic cylinder is provided with an oil tank and a piston chamber, and the electric pump includes a motor mounted on a valve seat, an eccentric wheel mounted on the motor output shaft and located in the valve seat, and at least one pump core structure movably mounted in the valve seat and driven by the eccentric wheel to pump oil into the piston chamber to drive the hydraulic cylinder to perform lifting work.

[0009] More preferably, the pump core structure includes a pump chamber disposed on a valve seat, a pump core movably installed in the pump chamber and having one end in contact with an eccentric wheel to perform a pressurizing action; the valve seat is also provided with an oil chamber connecting the pump chamber and the oil tank, an oil inlet chamber connecting the oil chamber and the piston chamber, and an oil return chamber connecting the piston chamber and the oil tank.

[0010] In a further preferred embodiment, a plug and a pump body are also installed inside the pump chamber, and a spring is installed between the pump body and the pump core to push the pump core to reset and draw oil from the oil tank into the oil chamber and the pump chamber; a one-way valve is provided in both the oil inlet chamber and the oil chamber, and a safety valve is also installed on the valve seat.

[0011] Further preferably, it also includes a drain valve installed in the return oil chamber. The drain valve includes a drain valve core movably installed in the return oil chamber, a drain valve seat disposed in the return oil chamber and cooperating with the drain valve core, a drain valve push rod disposed in the return oil chamber and driven by the actuator to press the drain valve core downward to open the return oil passage, a second spring installed in the return oil chamber to push the drain valve core upward to cut off the return oil passage, a third spring installed in the return oil chamber to push the drain valve rod upward to reset, an energy storage spring installed between the drain valve push rod and the drain valve core, and a plug installed in the return oil chamber to support the second spring. The drain valve core includes a large valve core, a small valve core located within the large valve core, a push rod slidably installed on the large valve core, and a steel ball installed within the large valve core and located between the small valve core and the push rod. The push rod is also provided with a drain groove.

[0012] A further preferred embodiment of the actuator includes a drive rod rotatably mounted on a valve block, a drive block disposed on the drive rod for pushing the oil release valve push rod to perform an action, and a push-pull electromagnet movably connected to the drive rod and driving the drive rod to rotate about the movably connected point with the valve block as the base point. The drive block is provided with an inclined surface.

[0013] A further preferred embodiment includes a retaining mechanism mounted on the drive rod for limiting and holding the position of the drive rod, wherein the retaining mechanism is an electromagnet mounted on the drive rod.

[0014] The beneficial effects of this utility model are: by using lithium batteries to provide power to the electric lifting platform, the overall structure of the lithium battery is more compact, lighter and cheaper, making it easier for users to carry and operate.

[0015] With the electric pump and drive unit, the lifting platform is raised by starting the electric pump to drive the hydraulic cylinder. The hydraulic cylinder drives the scissor lift assembly and the platform to lift. When the lifting platform is lowered, the drive unit is started by controlling the starter unit. The starter unit then drives the oil drain valve to open and drives the lifting platform to lower. The lifting and lowering of the lifting platform does not require manual driving. The lifting and lowering is smooth and the manual labor intensity is low.

[0016] Meanwhile, by placing the control buttons directly on the handle of the lifting platform, the operator can directly press the control buttons on the handle to control the lifting platform to rise or fall. The operation is simple and convenient and the overall structure is simple.

[0017] By incorporating a safety mechanism, when a hydraulic cylinder malfunctions and causes the platform to drop suddenly, the safety mechanism prevents the platform from falling to the bottom. During the descent, the scissor lift assembly drives one end of the guard rod to slide on the base frame until the guard rod abuts against the baffle, thus supporting the scissor lift assembly. This prevents the scissor lift assembly from continuously moving the platform downwards to the bottom, which could cause items on the platform to fall due to the sudden drop, resulting in damage or even a safety accident. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a partial structural schematic diagram from another perspective of the present invention;

[0020] Figure 3 This is a partial structural schematic diagram of the present invention;

[0021] Figure 4 This is a partial cross-sectional structural diagram of the drain valve in this utility model;

[0022] Figure 5 This is a partially enlarged structural diagram of the drain valve in this utility model;

[0023] Figure 6 This is a schematic cross-sectional view of the pump core structure in this utility model;

[0024] Figure 7 This is a cross-sectional structural diagram of another embodiment of the pump core structure in this utility model.

[0025] Figure 8 This is a partial cross-sectional structural diagram of the valve seat in this utility model.

[0026] Legend: 1. Base frame; 11. Handle; 12. Caster wheel; 13. Scissor lift assembly; 14. Platform; 2. Hydraulic cylinder; 21. Oil tank; 22. Piston chamber; 3. Valve seat; 31. Oil chamber; 32. Inlet chamber; 33. Return chamber; 34. Plug; 35. Pump body; 4. Electric pump; 41. Motor; 42. Eccentric wheel; 43. Pump chamber; 44. Pump core; 45. Spring 1; 46. Check valve; 47. Safety valve; 5. Actuator; 6. 61. Controller; 62. Control button; 7. Lithium battery; 8. Baffle; 9. Protective rod; 10. Limit pin; 11. Oil drain valve; 12. Oil drain valve seat; 13. Oil drain valve push rod; 14. Spring 2; 15. Spring 3; 16. Large valve core; 17. Small valve core; 18. Push rod; 19. Steel ball; 20. Oil drain groove; 11. Drive rod; 12. Drive block; 13. Push-pull electromagnet; 14. Inclined plane; 15. Electromagnet; 16. Energy storage spring. Detailed Implementation

[0027] The electric lifting platform of this utility model will now be further described in conjunction with the accompanying drawings.

[0028] It should be noted that all directional indicators such as up, down, left, right, front, back, etc. in the embodiments of this utility model are only used to explain the relative positional relationship and movement of the components in a specific posture as shown in the attached figure. If the specific posture changes, the directional indicator will also change accordingly.

[0029] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly; for example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can also mean a mechanical connection, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] See Figures 1-8As shown, an electric lifting platform includes a base frame 1, a handle 11 mounted on the base frame 1, casters 12 mounted on the base frame 1, a scissor lift assembly 13 mounted on the base frame 1, a platform 14 mounted on the scissor lift assembly 13, and a hydraulic cylinder 2 with one end movably mounted on the base frame 1 and the other end movably connected to the scissor lift assembly 13; characterized in that it also includes a valve seat 3 mounted on the hydraulic cylinder 2, an electric pump 4 mounted on the valve seat 3 for driving the hydraulic cylinder 2 to perform a lifting action, and a drain valve 8 on the valve block for driving the hydraulic cylinder 2 to return oil and descend. The device includes a driver 5, a controller 6 mounted on the base frame 1 for controlling the electric pump 4 and the driver 5 and electrically connected to the electric pump 4 and the driver 5, and a control button 61 mounted on the handle 11 and electrically connected to the controller 6. The control button 61 includes an up button, a down button, and a hold button. The up button is used to start the electric pump 4 and stops the up movement when pressed again. The down button is used to start the driver 5 and stops the down movement when pressed again. The hold button is used to energize the electromagnet 95 and de-energizes the electromagnet 95 when pressed again.

[0031] With the electric pump 4 and the driver 5, the lifting platform 14 is lifted by starting the electric pump 4 to drive the hydraulic cylinder 2. The hydraulic cylinder 2 drives the scissor assembly 13 and the platform 14 to lift. When the lifting platform 14 is lowered, the driver 5 is started by controlling the starter, which drives the oil drain valve 8 to open and drives the lifting platform 14 to lower. The lifting and lowering of the lifting platform 14 does not require manual driving, the lifting is smooth and the labor intensity is low.

[0032] Meanwhile, by directly setting the control button 61 on the handle 11 of the lifting platform 14, the operator can directly press the control button 61 on the handle 11 to control the lifting platform 14 to rise or fall, making the operation simple and convenient.

[0033] In one embodiment, a lithium battery 62 electrically connected to the controller 6 is also included, which powers the entire electric lifting platform 14. By using a lithium battery to provide power to the electric lifting platform, the overall structure of the lithium battery is more compact, lighter, and less expensive, making it easier for users to carry and operate.

[0034] In one embodiment, the platform 14 is further provided with a safety mechanism to prevent it from falling to the bottom. The safety mechanism includes a baffle 7 installed on the base frame 1 for limiting the position and a protective rod 71 that is rotatably mounted on the scissor lift assembly 13 at one end by a pin and provides limiting support for the continuous downward movement of the scissor lift assembly 13 when the other end abuts against the baffle 7. The scissor lift assembly 13 is also provided with a limiting pin 72 for limiting the position of the protective rod 71 after it is lifted.

[0035] By setting up an insurance mechanism, when the hydraulic cylinder 2 malfunctions and the platform 14 drops suddenly, the insurance mechanism prevents the platform 14 from dropping to the bottom. During the descent, the scissor lift assembly 13 drives one end of the guard rod 71 to slide on the base frame 1 until one end of the guard rod 71 abuts against the baffle 7, which supports the scissor lift assembly 13 and limits the continuous descent of the scissor lift assembly 13. This prevents the scissor lift assembly 13 from driving the platform 14 to continue moving downwards to the bottom, which could cause items on the platform 14 to fall due to the high drop height, resulting in damage or even a safety accident.

[0036] By setting the limit pin 72, when the lifting platform 14 descends to the bottom, the guard rod 71 is lifted, so that the guard rod 71 rotates with one pin as the base point, so that the other end of the guard rod 71 no longer abuts against the baffle 7. After the guard rod 71 contacts the limit pin 72, the limit pin 72 plays a limiting support role for the guard rod 71, so as to avoid the guard rod 71 interfering with the platform 14 when it descends.

[0037] In one embodiment, the hydraulic cylinder 2 is provided with an oil tank 21 and a piston chamber 22. The electric pump 4 includes a motor 41 mounted on a valve seat 3, an eccentric wheel 42 mounted on the output shaft of the motor 41 and located in the valve seat 3, and at least one pump core structure movably mounted in the valve seat 3 and driven by the eccentric wheel 42 to pump oil into the piston chamber 22 to drive the hydraulic cylinder 2 to perform lifting work.

[0038] The pump core structure includes a pump chamber 43 disposed on a valve seat 3 and a pump core 44 movably installed in the pump chamber 43 and having one end in contact with an eccentric wheel 42 to perform a pressurizing action; the valve seat 3 is also provided with an oil chamber 31 connecting the pump chamber 43 and the oil tank 21, an oil inlet chamber 32 connecting the oil chamber 31 and the piston chamber 22, and an oil return chamber 33 connecting the piston chamber 22 and the oil tank 21;

[0039] The pump chamber 43 is also equipped with a plug 34 and a pump body 35. A spring 45 is installed between the pump body 35 and the pump core 44 to push the pump core 44 to reset and draw oil from the oil tank 21 into the oil chamber 31 and the pump chamber 43. The one-way valve 46 on the oil inlet chamber 32 is used to cut off the oil passage between the oil inlet chamber 32 and the oil chamber 31. When the pressure in the oil chamber 31 and the pump chamber 43 is greater than the pressure set by the one-way valve 46 in the oil inlet chamber 32, it pushes the one-way valve 46 in the oil inlet chamber 32 to open and pump oil into the oil inlet chamber 32 and the piston chamber 22. The one-way valve 46 in the oil chamber 31 is used to cut off the oil passage between the oil chamber 31 and the oil tank 21. When the pressure in the oil chamber 31 and the pump chamber 43 is less than the oil pressure in the oil tank 21, the oil in the oil tank 21 pushes the one-way valve 46 in the oil chamber 31 to open and draw oil into the oil chamber 31 and the pump chamber 43. The valve seat 3 is also equipped with a safety valve 47.

[0040] During the process of the motor 41 driving the eccentric wheel 42 to rotate, the eccentric wheel 42 generates a thrust on the pump core 44. After being thrust, the pump core 44 squeezes the hydraulic oil, pushes the hydraulic oil open the one-way valve 46 set in the oil inlet chamber 32, squeezes it into the oil inlet chamber 32, and then enters the piston chamber 22 to drive the hydraulic cylinder 2 to perform lifting work.

[0041] During the rotation of the eccentric wheel 42, when it no longer exerts thrust on the pump core 44, the one-way valve 46 in the oil inlet chamber 32 closes. At the same time, the return force of the spring 45 pushes the pump core 44 to move backward. During the backward movement of the pump core 44, the volume of the cavity between the pump core 44 and the plug 34 increases. The one-way valve 46 in the oil chamber 31 is opened by negative pressure, and oil is drawn into the oil chamber 31 and the pump chamber 43. During the continuous rotation of the eccentric wheel 42, when the eccentric wheel 42 exerts thrust on the pump core 44, the pump core 44 squeezes the hydraulic oil after being pushed, pushes the hydraulic oil open the one-way valve 46 in the oil inlet chamber 32 and squeezes it into the oil inlet chamber 32 and then into the piston chamber 22.

[0042] In one embodiment, a drain valve 8 is further included in the return oil chamber 33. The drain valve 8 includes a drain valve core movably installed in the return oil chamber 33, a drain valve seat 81 disposed in the return oil chamber 33 and cooperating with the drain valve core, a drain valve push rod 82 disposed in the return oil chamber 33 and driven by the driver 5 to press the drain valve core downward to open the return oil passage, a spring 83 installed in the return oil chamber 33 for pushing the drain valve core upward to cut off the return oil passage, and a spring 83 installed in the return oil chamber 33 for pushing the drain valve core upward to cut off the return oil passage. The oil drain valve 8 rod is reset upward by a spring 3 84, an energy storage spring 10 is installed between the oil drain valve push rod (82) and the oil drain valve core, and a plug 34 is installed in the oil return chamber 33 to support the spring 2 83; the oil drain valve core includes a large valve core 85, a small valve core 86 inside the large valve core 85, a push rod 87 slidably installed on the large valve core 85, and a steel ball 88 installed inside the large valve core 85 and between the small valve core 86 and the push rod 87, and the push rod 87 is also provided with an oil drain groove 89;

[0043] The driver 5 includes a drive rod 9 mounted on the valve block with one end rotatable via a pin, a drive block 91 set on the drive rod 9 for pushing the oil drain valve push rod 82 to move, and a push-pull electromagnet 92 movably connected to the drive rod 9 and driving the drive rod 9 to rotate around the movable connection point with the valve block as the base point. The drive block 91 is provided with an inclined surface 93.

[0044] During oil return, the push-pull electromagnet 92 is energized, causing the drive rod 9 to rotate around its movable connection point with the valve block. This rotation of the drive rod 9 drives the drive block 91 to rotate, which in turn exerts a downward pressure on the drain valve push rod 82 via the inclined plane 93. Under this downward pressure, the drain valve push rod 82 pushes the top rod 87 downwards, which in turn pushes the steel ball 88 and the small valve. When core 86 moves downward, it opens the return oil circuit of small valve core 86. Oil flows through the oil circuit between small valve core 86 and large valve core 85 and then through the drain groove 89 on push rod 87 for return oil. When drain valve push rod 82 continues to move downward until it contacts large valve core 85, it pushes large valve core 85 downward. After large valve core 85 moves downward, it opens the oil circuit between large valve core 85 and drain valve seat 81. At this time, the return oil circuit of large valve core 85 is also opened, and rapid return oil is performed. Hydraulic cylinder 2 drives platform 14 to descend.

[0045] In one embodiment, a retaining mechanism is further included, which is an electromagnet 95 mounted on the drive rod 9 for limiting and retaining the position of the drive rod 9.

[0046] By maintaining the mechanism's setting, after the push-pull electromagnet 92 drives the drive rod 9 to open the drain valve 8, the electromagnet 95 is energized and magnetically fixed to the valve block. The electromagnet 95 maintains the position of the drive rod 9, thus keeping the drain valve 8 open. This avoids problems such as the push-pull electromagnet 92 overheating and failing or short-circuiting due to prolonged energization during the oil return process, which could cause the drain valve 8 to close. At the same time, after the electromagnet 95 is activated, the controller 6 can control the push-pull electromagnet 92 to be de-energized, saving energy and preventing the push-pull electromagnet 92 from overheating and failing or short-circuiting due to prolonged energization.

[0047] In use, the operator moves the entire lifting platform 14 by pushing the handle 11.

[0048] When the platform 14 needs to be lifted, the operator presses the lift button, and the controller 6 controls the motor 41 to start. After the motor 41 starts, it drives the eccentric wheel 42 to rotate. When the eccentric wheel 42 rotates, it exerts a thrust on the pump core 44. After being pushed, the pump core 44 squeezes the hydraulic oil in the pump chamber 43. When the oil pressure in the pump chamber 43 and the oil chamber 31 is greater than the set pressure of the one-way valve 46 in the oil inlet chamber 32, the hydraulic oil pushes open the one-way valve 46 in the oil inlet chamber 32 and squeezes into the oil inlet chamber 32. Then it enters the piston chamber 22 to drive the hydraulic cylinder 2 to lift. When lifting, the hydraulic cylinder 2 drives the scissor assembly 13 to lift the platform 14.

[0049] During the continuous rotation of the eccentric wheel 42, when the eccentric wheel 42 no longer exerts thrust on the pump core 44, the one-way valve 46 in the oil inlet chamber 32 closes. At the same time, the return force of the spring 45 pushes the pump core 44 to move backward. During the backward movement of the pump core 44, the volume of the cavity between the pump core 44 and the plug 34 increases. The one-way valve 46 in the oil chamber 31 is opened by negative pressure, and oil is drawn into the oil chamber 31 and the pump chamber 43. During the continuous rotation of the eccentric wheel 42, when the eccentric wheel 42 exerts thrust on the pump core 44 again, the pump core 44, under the thrust, squeezes the hydraulic oil, pushes the one-way valve 46 in the oil inlet chamber 32 open, and squeezes the hydraulic oil into the oil inlet chamber 32 and then into the piston chamber 22. The hydraulic cylinder 2 continuously drives the scissor assembly 13 to lift the platform 14. When the platform 14 rises to the required height, the operator presses the lift button again, and the controller 6 cuts off the power to the electric pump 4, stopping the lifting.

[0050] At this time, the operator moves the guard rod 71 so that one end of the guard rod 71 contacts the base frame 1. When the platform 14 suddenly drops due to malfunction or other reasons, the other end of the guard rod 71 can prevent the platform 14 from dropping to the bottom after it abuts against the baffle 7.

[0051] When platform 14 descends, the operator presses the descent button, and controller 6 energizes the push-pull electromagnet 92. After energization, the electromagnet 92 drives the drive rod 9 to rotate around its movable connection point with the valve block. During this rotation, the drive rod 9 drives the drive block 91 to rotate. As the drive block 91 rotates, it exerts a downward squeezing force on the drain valve push rod 82 via the inclined plane 93. Under this downward squeezing force, the drain valve push rod 82 pushes the top rod 87 downwards. The push rod 87 pushes the steel ball 88 and the small valve core 86 to move downward, opening the return oil circuit of the small valve core 86. The oil flows through the oil circuit between the small valve core 86 and the large valve core 85 and through the oil drain groove 89 on the push rod 87 for slow return oil. When the oil drain valve push rod 82 continues to move downward until it contacts the large valve core 85, it pushes the large valve core 85 to move downward. After the large valve core 85 moves downward, it opens the oil circuit between the large valve core 85 and the oil drain valve seat 81. At this time, the return oil circuit of the large valve core 85 is also opened for rapid return oil. The hydraulic cylinder 2 drives the platform 14 to descend.

[0052] When the push-pull electromagnet 92 drives the oil drain valve 8 to open, the controller 6 can automatically control or the operator can press the holding button to energize the electromagnet 95. After the electromagnet 95 is energized, it magnetically attracts the valve block and holds the position of the drive rod 9, keeping the oil drain valve 8 in the open state. After the electromagnet 95 is energized, the controller 6 can automatically control the de-energization of the push-pull electromagnet 92 or the operator can manually press the descent button again, and then the controller 6 will de-energize the push-pull electromagnet 92. At this time, when it is necessary to pause the descent, the controller 6 will control the de-energization of the electromagnet 95 by pressing the holding button. After the electromagnet 95 is de-energized, the drive block 91 loses the squeezing force on the oil drain valve push rod 82. The return force of the spring 3 84 pushes the oil drain valve push rod 82 to return upward. At the same time, the spring 2 83 pushes the oil drain valve core to move upward and cuts off the oil passage between the oil drain valve core and the oil drain valve seat 81.

[0053] When preparing to descend or during the descent, the operator moves the guard rod 71 so that the other end of the guard rod 71 is disengaged from the base frame 1 and rotates it along the movable connection point between the other end of the guard rod 71 and the scissor assembly 13 as the base point until the guard rod 71 contacts the limit pin 72 and rests on the limit pin 72.

[0054] Alternatively, after the other end of the guard rod 71 abuts against the baffle 7, the operator can press the rise button again to move the platform 14 upwards by one distance, so that the guard rod 71 can rotate to the limit pin 72 and then stop rising. Then, the operator can move the guard rod 71 again to disengage the other end of the guard rod 71 from the base frame 1 and rotate it along the movable connection point between the other end of the guard rod 71 and the scissor lift assembly 13 as the base point until the guard rod 71 contacts the limit pin 72 and rests on the limit pin 72. Then, the operator can press the descent button to control the platform 14 to continue descending to the bottom.

[0055] The scope of protection of this utility model is not limited to the above embodiments and their variations. Conventional modifications and substitutions made by those skilled in the art based on the content of these embodiments are all within the scope of protection of this utility model.

Claims

1. An electric lifting platform, comprising a base frame (1), a handle (11) mounted on the base frame (1), casters (12) mounted on the base frame (1), a scissor lift assembly (13) mounted on the base frame (1), a platform (14) mounted on the scissor lift assembly (13), and a hydraulic cylinder (2) movably mounted at one end on the base frame (1) and movably connected at the other end to the scissor lift assembly (13); characterized in that... It also includes a valve seat (3) mounted on the hydraulic cylinder (2), an electric pump (4) mounted on the valve seat (3) for driving the hydraulic cylinder (2) to perform a lifting action, an actuator (5) for driving the drain valve (8) on the valve block to perform a return oil descent of the hydraulic cylinder (2), a controller (6) mounted on the base frame (1) for controlling the electric pump (4) and the actuator (5) and electrically connected to the electric pump (4) and the actuator (5), and a control button (61) mounted on the handle (11) and electrically connected to the controller (6).

2. The electric lift platform according to claim 1, wherein: It also includes a lithium battery (62) electrically connected to the controller (6).

3. The electric lift platform according to claim 1, wherein: It also includes a safety mechanism to prevent the platform (14) from suddenly dropping to the bottom. The safety mechanism includes a baffle (7) installed on the base frame (1) to limit the movement and a guard rod (71) that is rotatably mounted on the scissor assembly (13) by a pin at one end and provides a limiting support for the continuous downward movement of the scissor assembly (13) when it abuts against the baffle (7) at the other end. The scissor assembly (13) is also provided with a limiting pin (72) to limit the position of the guard rod (71) after it is raised.

4. The electric lift platform according to claim 1, wherein: The hydraulic cylinder (2) is provided with an oil tank (21) and a piston chamber (22). The electric pump (4) includes a motor (41) mounted on a valve seat (3), an eccentric wheel (42) mounted on the output shaft of the motor (41) and located in the valve seat (3), and at least one pump core structure that is movably mounted in the valve seat (3), driven by the eccentric wheel (42) to pump oil into the piston chamber (22) to drive the hydraulic cylinder (2) to perform lifting work.

5. The electric lift platform according to claim 4, wherein: The pump core structure includes a pump chamber (43) disposed on the valve seat (3) and a pump core (44) movably installed in the pump chamber (43) and having one end in contact with the eccentric wheel (42) to perform a pressurizing action; the valve seat (3) is also provided with an oil chamber (31) connecting the pump chamber (43) and the oil tank (21), an oil inlet chamber (32) connecting the oil chamber (31) and the piston chamber (22), and an oil return chamber (33) connecting the piston chamber (22) and the oil tank (21).

6. A power lift platform as claimed in claim 5, wherein: The pump chamber (43) is also equipped with a plug (34) and a pump body (35). A spring (45) is installed between the pump body (35) and the pump core (44) to push the pump core (44) to reset and to draw oil from the oil tank (21) into the oil chamber (31) and the pump chamber (43). A one-way valve (46) is provided in both the oil inlet chamber (32) and the oil chamber (31). A safety valve (47) is also installed on the valve seat (3).

7. The electric lift platform according to claim 5, wherein: It also includes a drain valve (8) installed in the return oil chamber (33). The drain valve (8) includes a drain valve core movably installed in the return oil chamber (33), a drain valve seat (81) installed in the return oil chamber (33) and cooperating with the drain valve core, a drain valve push rod (82) installed in the return oil chamber (33) and driven by the driver (5) to press the drain valve core downward to open the return oil passage, a spring (83) installed in the return oil chamber (33) to push the drain valve core upward to cut off the return oil passage, and a spring (83) installed in the return oil chamber (33) to push the drain valve push rod (82). The spring three (84) that returns to its upward position, the energy storage spring (10) installed between the oil drain valve push rod (82) and the oil drain valve core, and the plug (34) installed in the return oil chamber (33) to support the spring two (83); the oil drain valve core includes a large valve core (85), a small valve core (86) located in the large valve core (85), a push rod (87) slidably installed on the large valve core (85), and a steel ball (88) installed in the large valve core (85) and located between the small valve core (86) and the push rod (87). The push rod (87) is also provided with an oil drain groove (89).

8. An electric lifting platform according to claim 7, characterized in that: The driver (5) includes a drive rod (9) mounted on the valve block with one end rotatable, a drive block (91) set on the drive rod (9) for pushing the oil drain valve push rod (82) to move, and a push-pull electromagnet (92) movably connected to the drive rod (9) and driving the drive rod (9) to rotate around the movably connected point with the valve block as the base point. The drive block (91) is provided with an inclined surface (93).

9. The electric lift platform according to claim 8, wherein: It also includes a holding mechanism mounted on the drive rod (9) for limiting and holding the position of the drive rod (9), wherein the holding mechanism is an electromagnet (95) mounted on the drive rod (9).

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