A control method of an electro-hydraulic jack and an electro-hydraulic high-position conveying jack

Abstract

The application discloses a control method of an electric hydraulic jack and an electric hydraulic high-position conveying jack, and is characterized by the control method as follows: when jacking is controlled, an operator opens a total switch on a control terminal device, and then presses an ascending switch, so that a motor drives an electric pump to start, and oil is pumped into the high-position conveying jack to drive the high-position conveying jack to work; when jacking is stopped, the operator releases the ascending switch, and after the main control module receives a signal of the released ascending switch, the main control module controls the motor brake to avoid the problem that the jacking height of the high-position conveying jack exceeds a set position due to the inertia of the motor continuously pumping oil into the high-position conveying jack. After the ascending switch is released, the main control module controls the motor to brake, so that the problem that the high-position conveying jack continuously rises due to the inertia of the motor continuously driving the electric pump to pump oil into the hydraulic cylinder after the ascending switch is released and the jacking of the high-position conveying jack is stopped is avoided, and the jacking position of the high-temperature conveying jack is more accurate.

Description

Technical Field

[0001] This invention relates to a high-level transport jack, specifically to a control method for an electro-hydraulic jack and an electro-hydraulic high-level transport jack. Background Technology

[0002] An electric high-lift jack is a device that uses an electric motor as a power element and a hydraulic system to drive the lifting mechanism. It is widely used in situations requiring the lifting of heavy objects, such as vehicle repair and equipment installation. In the prior art, such as the control method for an electric hydraulic jack described in Chinese Patent Publication CN119802051A, the main control module controls the coordinated operation of components such as the motor, electric pump, and electromagnet to achieve the lifting and lowering control of the jack. However, the following problems still exist in its practical application: 1. After the lifting switch is released to stop the lifting, the motor will continue to rotate due to inertia, causing the electric pump to continuously supply oil to the hydraulic system. This causes the actual lifting height of the jack to exceed the set position, affecting the lifting accuracy, especially in working conditions that require precise positioning. Second, when the motor is powered off, it will generate electrical energy during inertial operation. If the electrical energy generated at this time remains in the motor, it will cause the motor to overheat or even short-circuit. Existing technologies also include electric jacks that adjust the lifting speed by changing the motor speed, but these jacks also suffer from the aforementioned problems. Therefore, a control method for an electro-hydraulic jack and an electro-hydraulic high-level transport jack are proposed. Summary of the Invention

[0003] The purpose of this invention is to solve the above problems by proposing a control method for an electro-hydraulic jack and an electro-hydraulic high-level transport jack.

[0004] To achieve the above objectives, the present invention provides a control method for an electric hydraulic jack, characterized in that the control method is as follows: When the lifting operation is under control, the operator turns on the main switch on the control terminal equipment and then presses the lifting switch to send a signal to the main control module. The main control module controls the motor to start through the conduction module one, thereby controlling the electric pump motor to start. The motor drives the pump body to start, pumping hydraulic oil from the oil tank into the oil cylinder to drive the oil cylinder piston rod to perform the lifting operation. When the lifting stops, the operator releases the lifting switch, and the main control module controls the battery, the first conducting module, and the motor to disconnect and stop supplying power to the motor. At the same time, the main control module controls the battery and the two-way connection module to the motor. The main control module controls the motor brake to prevent the oil cylinder from being continuously pumped into the oil cylinder due to inertia, which would cause the oil cylinder to rise to a height exceeding the set position.

[0005] In a further preferred embodiment, when the motor is braked, the main control module controls the connection between the battery, the second conduction module, and the motor, and controls the output voltage to the motor to be lower than the input voltage when the motor is running normally, driving the motor to decelerate. The motor stops after deceleration, reducing inertia and achieving braking.

[0006] In a further preferred embodiment, when the motor is braked, the main control module controls the battery, the second conduction module, and the motor to conduct, and the control module controls the motor to rotate in reverse for a short time. By reversing the rotation, the motor is forced to stop, thus achieving braking.

[0007] In a further preferred embodiment, when the motor is braked, the main control module controls the electromagnetic brake to lock the motor shaft, thereby causing the motor to stop rotating and achieving braking.

[0008] In a further preferred embodiment, braking is achieved by controlling the motor to brake, or by controlling the driver through the main control module to drive the brake element to press against the motor shaft and thus stop the motor from rotating.

[0009] In a further preferred embodiment, the main control module controls the motor brake instead of controlling the solenoid valve located on the oil supply line between the oil tank and the oil cylinder to cut off the oil supply line, thereby preventing the oil cylinder from being lifted higher than the set position due to the motor continuously pumping oil into the oil cylinder due to inertia.

[0010] In a further preferred embodiment, after the operator releases the lifting switch, the main control module controls the conduction module two to connect the motor, battery, and capacitor, thereby recovering the electrical energy generated by the electric pump motor due to inertia into the battery and / or capacitor, thus recovering the inertial energy of the motor.

[0011] Further preferred features include real-time monitoring of the motor's current and temperature parameters during operation. If the parameters are within the set range, the motor will operate normally; if they exceed the set range, the main control module will control the motor to stop operating. It also includes a current detection unit that establishes communication with the main control module and performs real-time detection of motor current parameters, and a temperature detection unit that detects motor temperature.

[0012] Further preferably, it also includes a display module controlled by the main control module to display different conditions. During operation, the battery voltage is monitored in real time. When the battery voltage is lower than the set value, the control module controls the display module to start and inform the operator that the battery voltage is low.

[0013] More preferably, the control terminal device and the main control module are connected by wire or wireless means; when using a wireless connection, the control terminal device and the main control module establish a wireless connection using a communication module; the communication module is any one of a Bluetooth communication module or a network communication module.

[0014] In a further preferred embodiment, after receiving the signal from the release of the rise switch, the main control module pauses for a set time. After the set time is reached, the main control module controls the conduction module two to connect the motor, battery, and capacitor, so as to recover the electrical energy generated by the motor of the electric pump due to inertia into the battery and / or capacitor, thereby recovering the inertial energy of the motor.

[0015] An electro-hydraulic high-level transport top, characterized in that it includes a base frame, a hydraulic cylinder placed on the base frame, and a support frame placed on top of the hydraulic cylinder; It also includes an electric pump for driving the hydraulic cylinder to perform a lifting action; it also includes an oil drain valve located on the upper part of the hydraulic cylinder for controlling the return of oil from the hydraulic cylinder; the hydraulic cylinder includes a housing, a cylinder body placed inside the housing, a piston rod placed inside the cylinder body, and a top cap seat and a top cap connected to the housing and the cylinder body, an oil tank is formed between the housing and the cylinder body, a gap for oil return is left between the piston rod and the cylinder body, an oil return chamber is provided between the top cap seat and the cylinder body, an oil hole is provided on the cylinder body to connect the oil return chamber and the gap, and an oil return channel is provided on the top cap seat to connect the oil tank and the oil return chamber.

[0016] A further preferred embodiment includes a drain valve seat connected to a top cap seat, a drain valve stem threadedly connected to the drain valve seat, a steel ball disposed in the return oil passage and located between the drain valve stem and the top cap seat, a handwheel connected to the drain valve stem for rotating the drain valve stem to open or close the drain valve, a torsion spring sleeve connected to the drain valve seat, and a torsion spring disposed between the torsion spring sleeve and the handwheel.

[0017] More preferably, the electric pump includes a valve seat connected to the base frame, a plunger structure disposed in the valve seat for pressurizing oil in the oil tank into the cylinder body, a motor connected to the valve seat, and an eccentric wheel connected to the motor for driving the plunger structure to move. The plunger structure includes a piston chamber mounted on the valve seat, a spring limiting seat mounted inside the piston chamber, a piston slidably connected inside the piston chamber, a spring mounted between the spring limiting seat and the piston, a plunger seat connected inside the piston chamber, and a plunger slidably connected inside the plunger seat with one end in contact with the piston and the other end in contact with the eccentric wheel; the valve seat is also provided with an oil suction passage connecting the piston chamber and the oil tank, and an oil inlet passage connecting the piston chamber and the cylinder.

[0018] Further preferably, it also includes a plurality of oil passage holes provided on the piston; and a sealing element provided between the piston and the piston chamber, between the plunger seat and the piston chamber, and between the plunger seat and the plunger; It also includes one-way valves installed in the oil suction line and the oil inlet line, as well as safety valves installed on the valve block.

[0019] Further preferably, it also includes a battery cover connected to the oil cylinder, a battery holder connected to the battery cover, and a battery connected to the battery holder; it also includes a foot switch mounted on the base frame for controlling the opening and closing of the electric pump, the foot switch including a foot bracket, a switch mounted inside the foot bracket and connected to the battery holder via a circuit, a foot movably connected to the foot bracket at one end via a pin, and a button contact shaft mounted on the foot corresponding to the position of the switch and contacting the switch when the foot is stepped on.

[0020] Further preferably, it also includes a spring column mounted on the footrest, a spring shaft mounted on the footrest, and a spring fitted on the spring column and spring shaft for pushing the footrest to reset; it also includes a foot cover mounted on the base frame to protect the foot switch; It also includes a motor guard mounted on the base frame to protect the electric pump, a handle mounted on the hydraulic cylinder, and casters mounted on the base frame.

[0021] The beneficial effects of this invention are as follows: After the lifting switch is released, the main control module controls the motor to brake or controls the solenoid valve set in the oil supply line between the oil tank and the oil cylinder to start and cut off the oil supply line. This avoids the problem that the high-position conveying top will continue to rise due to the inertia of the motor after the lifting switch is released and the lifting of the high-position conveying top stops. This makes the lifting position of the high-temperature conveying top more accurate. After releasing the lifting switch, the circuit between the main control module, the conduction module and the motor is cut off. At the same time, the main control module controls the connection between the battery, the conduction module, the capacitor and the motor, so that most of the electrical energy generated by the motor due to inertia is recovered into the battery and the capacitor, and the remaining part is converted into heat energy for dissipation. This avoids all the electrical energy generated by inertia remaining in the motor, which would affect the normal use of the motor or even damage it. By placing the drain valve on the upper part of the hydraulic cylinder, it is convenient for the operator to operate the drain valve during descent. When opening and closing the drain valve, the operator does not need to be at the bottom of the high-level transport top. The operator only needs to be at the side of the high-level transport top and reach the drain valve to perform the drain operation. At the same time, during the descent, the operator's other hand can also hold the supported item, reducing the risk of the item falling and effectively improving the safety during use. This prevents the item supported by the support frame from falling and being damaged or even injuring the operator at the bottom of the high-level transport top who is operating the drain valve during the descent of the hydraulic cylinder. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the control system of the present invention; Figure 2 This is a schematic diagram of another embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the present invention; Figure 4This is a partial cross-sectional structural diagram of the drain valve in this invention; Figure 5 This is a partial structural diagram of the hydraulic cylinder in this invention; Figure 6 This is a partial structural schematic diagram of the present invention; Figure 7 This is a schematic cross-sectional view of the electric pump in this invention; Figure 8 This is a partially enlarged structural schematic diagram of the present invention; Figure 9 This is a schematic diagram of the valve block from another perspective. Figure 10 This is a schematic diagram of the valve block from another perspective. Figure 11 This is a partial structural diagram of the foot switch in this invention; Figure 12 This is a schematic diagram of the structure of Embodiment 2 of the present invention; Figure 13 This is a schematic diagram of the structure of Embodiment 2 of the present invention.

[0023] Legend: 1. Base frame; 2. Hydraulic cylinder; 21. Housing; 22. Cylinder body; 23. Piston rod; 24. Top cap seat; 25. Top cap; 26. Return oil chamber; 27. Oil hole; 28. Return oil passage; 3. Support frame; 4. Electric pump; 41. Valve seat; 42. Motor; 43. Eccentric wheel; 44. Piston chamber; 45. Spring limit seat; 46. Piston; 47. Spring; 48. Plunger seat; 49. Plunger; 410. Suction oil passage; 411. Inlet oil passage; 412. Through hole; 413. Seal; 414. Safety oil passage 5. Drain valve; 51. Drain valve seat; 52. Drain valve stem; 53. Steel ball; 54. Handwheel; 55. Torsion spring sleeve; 56. Torsion spring; 6. One-way valve; 61. Safety valve; 7. Battery cover; 71. Battery holder; 72. Battery; 8. Foot switch; 81. Foot bracket; 811. Compression spring column; 82. Switch; 83. Foot pedal; 831. Button contact shaft; 832. Compression spring shaft; 833. Compression spring; 9. Foot cover; 91. Motor protective cover; 92. Handle; 10. Caster wheel; 11. Driver; 12. Brake components. Detailed Implementation

[0024] The following description, in conjunction with the accompanying drawings, further illustrates the control method for an electro-hydraulic jack and the electro-hydraulic high-level transport jack according to the present invention.

[0025] It should be noted that all directional indications in the embodiments of the present invention, such as up, down, left, right, front, back, etc., 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 indication will also change accordingly.

[0026] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly; for example, "connection" can be an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction between two elements, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0027] Example 1 See Figures 1-11 As shown, a control method for an electro-hydraulic jack is characterized by the following: When the lifting operation is under control, the operator turns on the main switch on the control terminal equipment and then presses the lifting switch to send a signal to the main control module. The main control module controls the motor to start through the conduction module one, thereby controlling the electric pump motor to start. The motor drives the pump body to start, pumping hydraulic oil from the oil tank into the oil cylinder to drive the oil cylinder piston rod to perform the lifting operation. When the lifting stops, the operator releases the lifting switch, and the main control module controls the conduction module two to connect the motor, battery and capacitor, so as to recover the electrical energy generated by the motor of the electric pump due to inertia into the battery and / or capacitor, and recover the inertial energy of the motor. The control module is also equipped with a timing module. After the main control module receives the signal after the rise switch is released, it can pause for a set time. After the set time is reached, the main control module controls the conduction module two to connect the motor, battery and capacitor, so as to recover the electrical energy generated by the motor of the electric pump due to inertia into the battery and / or capacitor, and recover the inertial energy of the motor. After releasing the lifting switch, the circuit between the main control module, the conduction module and the motor is cut off. At the same time, the main control module controls the battery, the conduction module II, the capacitor and the motor to connect, so that most of the electrical energy generated by the motor due to inertia is recovered into the battery and the capacitor, and the remaining part is converted into heat energy and dissipated, so as to avoid all the electrical energy generated by inertia remaining in the motor and affecting the normal use of the motor or even damaging it. At the same time, the main control module controls the battery and the two-way connection module to the motor. The main control module controls the motor brake to prevent the oil cylinder from being continuously pumped into the oil cylinder due to the motor's inertia, which would cause the oil cylinder to rise to a height exceeding the set position. By controlling the motor to brake after the lifting switch is released, the problem of the high-level conveyor top continuing to rise due to the motor's inertia after the lifting switch is released and the high-level conveyor top stops rising is avoided, thus making the high-temperature conveyor top stop more accurately. After the lifting switch is released, the main control module receives a signal and controls the solenoid valve to start, cutting off the oil supply line. This prevents the hydraulic oil from being continuously pumped into the high-level transport top due to the motor's inertia, which would cause the high-level transport top to rise beyond the set position. The solenoid valve is located on the oil supply line connecting the oil tank and the oil cylinder. By directly cutting off the oil supply line through the solenoid valve, the hydraulic oil is prevented from continuously entering the oil cylinder through the oil supply line after the machine stops, thus preventing the high-level transport top from continuing to rise.

[0028] In one embodiment, when controlling the motor to brake, the main control module controls the connection between the battery, the conduction module and the motor, controls the output voltage to the motor to be lower than the input voltage when the motor is running normally, drives the motor to decelerate, and the motor stops after deceleration, reducing inertia and achieving braking; In this embodiment, when braking is implemented, after the lifting switch is released, the control module receives a signal and immediately or after a set time interval controls the connection between the battery, the second conducting module, and the motor to reduce the voltage output to the motor, thereby reducing the motor speed until it stops. The voltage reduction can be set in multiple levels, decreasing step by step until it is reduced to the set voltage and then disconnected, and the motor stops. The motor stops after the speed is reduced, effectively reducing the continuous rotation caused by inertia.

[0029] In one embodiment, when controlling the motor to brake, the main control module controls the battery, the second conduction module and the motor to conduct, and the control module controls the motor to rotate in reverse for a short time. The reverse rotation forces the motor to stop, thus achieving braking. In this embodiment, when braking is achieved, after the lifting switch is released, the main control module receives a signal and controls the battery, the conduction module and the motor to conduct, and controls the motor to rotate in reverse for a short time. The duration of the reverse rotation is set in the control module. By resisting the inertial forward rotation through reverse rotation, the motor is forced to stop and braking is achieved.

[0030] In one embodiment, when controlling the motor to brake, the main control module controls the electromagnetic brake to lock the motor shaft and drive the motor to stop rotating to achieve braking; In this embodiment, an electromagnetic brake is installed on the motor. After the lifting switch is released, the main control module receives a signal and controls the electromagnetic brake to start, driving the electromagnetic brake to lock the motor shaft and prevent the motor from continuing to rotate due to inertia, thus achieving braking.

[0031] In one embodiment, when the motor is braked, or when the main control module controls the driver 11 to drive the brake element 12 to abut against the motor shaft, thereby stopping the motor from rotating, the brake is achieved. The driver 11 can be any other linear driver such as a cylinder, hydraulic cylinder, or electric actuator. The driver 11 drives the brake element 12 to move, so that the brake element 12 abuts against the motor shaft and the motor stops rotating through friction, thereby achieving braking.

[0032] In one embodiment, the system further includes a current detection unit that establishes a communication relationship with the main control module and performs real-time detection of motor current parameters, and a temperature detection unit that monitors temperature. The system also includes real-time monitoring of the current and temperature parameters of the motor during operation. If the parameters are within the set range, the motor operates normally; if the parameters exceed the set range, the main control module controls the motor to stop operating. It also includes a display module controlled by the main control module to display different conditions of the high-level transport top. During operation, it monitors the battery voltage in real time. When the battery voltage is lower than the set value, the control module controls the display module to start and inform the operator that the battery voltage is low. The display module includes a green light to indicate normal status, a yellow light to indicate that the battery voltage is lower than the set value, and a red light to indicate that the motor is faulty or the detection data exceeds the set value and the machine stops. During normal operation, the motor current is detected in real time by the current detection unit. If it is within the set range, the motor will work normally. If an overcurrent or short circuit is detected, the main control module will control the motor to stop working and control the display module to display a red light. The motor temperature is detected in real time by the temperature detection unit. If it is within the set range, the motor will work normally. If it is detected to exceed the set range, the main control module will control the motor to stop working and control the display module to display a red light. The control terminal device and the main control module are connected by wired or wireless means; when using a wireless connection, the control terminal device and the main control module establish a wireless connection using a communication module; the communication module is either a Bluetooth communication module or a network communication module. The control terminal equipment can be directly installed on the top of the high-level transport, or a separate remote control can be set up. Both can be connected to the main control module via wired or wireless means.

[0033] The electro-hydraulic high-level transport jack in this embodiment includes a base frame 1, a hydraulic cylinder 2 placed on the base frame 1, and a support frame 3 placed on top of the hydraulic cylinder 2; it is characterized by further including an electric pump 4 for driving the hydraulic cylinder 2 to perform a lifting action. It also includes an oil drain valve 5 installed on the upper part of the cylinder 2 for controlling the return of oil from the cylinder 2; the cylinder 2 includes a housing 21, a cylinder body 22 placed inside the housing 21, a piston rod 23 placed inside the cylinder body 22, and a top cap seat 24 and a top cap 25 connected to the housing 21 and the cylinder body 22. An oil tank is formed between the housing 21 and the cylinder body 22. A gap for oil return is left between the piston rod 23 and the cylinder body 22. An oil return chamber 26 is provided between the top cap seat 24 and the cylinder body 22. An oil hole 27 is provided on the cylinder body 22 to connect the oil return chamber 26 and the gap. An oil return channel 28 is provided on the top cap seat 24 to connect the oil tank and the oil return chamber 26. The oil drain valve 5 includes an oil drain valve seat 51 connected to the top cap seat 24, an oil drain valve stem 52 threadedly connected to the oil drain valve seat 51, a steel ball 53 disposed in the oil return channel 28 and located between the oil drain valve stem 52 and the top cap seat 24, a handwheel 54 connected to the oil drain valve stem 52 by a pin and used to drive the oil drain valve stem 52 to rotate and open or close the oil drain valve 5, a torsion spring sleeve 55 connected to the oil drain valve seat 51 by a screw, and a torsion spring 56 disposed between the torsion spring sleeve 55 and the handwheel 54. By setting the drain valve 5 on the upper part of the cylinder 2, it is convenient for the operator to operate the drain valve 5 during descent. When opening and closing the drain valve 5, the operator does not need to be at the bottom of the high-level transport top to operate it. The operator only needs to be at the side of the high-level transport top and reach the drain valve 5 to perform the drain operation. At the same time, during the descent, the operator's other hand can also hold the supported item, reducing the risk of the item falling and effectively improving the safety during use. This prevents the item supported by the support frame 3 from falling and being damaged or even injuring the operator at the bottom of the high-level transport top who is operating the drain valve 5 during the descent of the cylinder 2. When controlling the oil cylinder 2 to release oil and descend, the operator turns the handwheel 54, which drives the oil release valve rod 52 to rotate. During the rotation, the oil release valve rod 52 moves backward through the threaded engagement with the oil release valve seat 51. During the backward movement, the oil release valve rod 52 no longer blocks the steel ball 53 to block the return oil passage 28. At this time, under the action of the piston rod 23 and the gravity of the supporting object, the oil in the cylinder 22 enters the return oil chamber 26 through the gap between the piston rod 23 and the cylinder 22 and through the oil hole 27. The oil flows back to the oil tank through the return oil passage 28 to complete the return oil. After the descent is completed, the handwheel 54 is turned in the opposite direction, which drives the oil release valve rod 52 to move forward through the threaded engagement with the oil release valve seat 51 during the rotation, blocking the steel ball 53 and cutting off the return oil passage 28.

[0034] In this embodiment, the electric pump 4 includes a valve seat 41 connected to the base frame 1, a plunger structure disposed in the valve seat 41 for pressurizing oil in the oil tank into the cylinder 22, a motor 42 connected to the valve seat 41, and an eccentric wheel 43 connected to the motor 42 for driving the plunger structure to move. The plunger structure includes a piston chamber 44 disposed on the valve seat 41, a spring limiting seat 45 disposed in the piston chamber 44, a piston 46 slidably connected in the piston chamber 44, a spring 47 disposed between the spring limiting seat 45 and the piston 46, a plunger seat 48 connected in the piston chamber 44, and a plunger 49 slidably connected in the plunger seat 48 with one end in contact with the piston 46 and the other end in contact with the eccentric wheel 43; the valve seat 41 is also provided with an oil suction passage 410 connecting the piston chamber 44 and the oil tank and an oil inlet passage 411 connecting the piston chamber 44 and the cylinder 22; It also includes several oil passage holes 412 provided on the piston 46; It also includes a seal 413 disposed between piston 46 and piston chamber 44, between plunger seat 48 and piston chamber 44, and between plunger seat 48 and plunger 49; It also includes a one-way valve 6 installed on the oil suction line 410 and the oil inlet line 411, and a safety valve 61 installed on the valve block. The oil inlet line 411 is connected to the oil tank via a safety oil line 414. The safety valve 61 is installed in the safety oil line 614. When the oil pressure exceeds the set pressure value of the safety valve 61, the safety valve 61 is opened and the oil returns to the oil tank through the safety oil line 414. When the hydraulic cylinder 2 is lifted, the motor 42 is started, which drives the eccentric wheel 43 to rotate. During the rotation, the eccentric wheel 43 contacts the plunger 49 and pushes the plunger 49. The plunger 49 then pushes the piston 46 to move in the piston chamber 44, thereby squeezing the hydraulic oil in the piston chamber 44. This pushes open the one-way valve 6 in the oil inlet passage 411, opening the oil inlet passage 411 and pumping the hydraulic oil into the cylinder body 22 through the oil inlet passage 411 to drive the piston rod 23 to lift. When the eccentric wheel 43 stops pushing the plunger 49 during rotation, the piston 46 and plunger 49 are reset by the restoring force of the spring 47. During the reset process, the hydraulic oil pushes open the one-way valve 6 in the oil suction passage 410, and draws the hydraulic oil in the oil tank into the piston chamber 44 through the oil suction passage 410. When the eccentric wheel 43 pushes the plunger 49 again during rotation, the hydraulic oil in the piston chamber 44 is pumped into the cylinder 22 through the oil inlet passage 411 to push the piston rod 23 to rise.

[0035] This embodiment also includes a battery cover 7 connected to the oil cylinder 2, a battery holder 71 connected to the battery cover 7, and a battery 72 connected to the battery holder 71. The battery cover 7 provides protection for the battery holder 71 and the battery 72. The battery 72 is electrically connected to the battery holder 71 and supplies power to the electric pump 4 through the battery 72.

[0036] This embodiment also includes a foot switch 8 mounted on the base frame 1 for controlling the opening and closing of the electric pump 4. The foot switch 8 includes a foot frame 81, a switch 82 mounted inside the foot frame 81 and connected to the battery holder 71 via a circuit, a foot 83 movably connected to the foot frame 81 at one end via a pin, and a button contact shaft 831 mounted on the foot 83 corresponding to the position of the switch 82 and contacting the switch 82 when the foot 83 is stepped on. The switch 82 can be a foot switch 8. In this embodiment, the riser switch used to control the motor's start and stop is a foot switch; It also includes a spring column 811 mounted on the footrest 81, a spring shaft 832 mounted on the footrest 83, and a spring 833 mounted on the spring column 811 and the spring shaft 832 for pushing the footrest 83 to reset. When controlling the start and stop of the electric pump 4, the operator steps on the foot pedal 83. The foot pedal 83 rotates downward based on the pin shaft. During the downward rotation of the foot pedal 83, the button contact shaft 831 moves downward. During the downward movement, the button contact shaft 831 contacts the switch 82 and presses the switch 82. After being pressed, the switch 82 is energized, turning on the motor 42. The motor 42 starts and performs oil pumping and lifting. When the operator releases the foot pedal 83, the foot pedal 83 is reset by the restoring force of the compression spring 833. After no longer pressing the switch 82 downward, the power is cut off, the motor 42 is turned off, and the oil pumping and lifting action stops.

[0037] In one embodiment, a foot cover 9 is also provided on the base frame 1 to protect the foot switch 8; the foot cover 9 provides protection for the foot 83 and the switch 82.

[0038] In one embodiment, it also includes a motor protective cover 91 provided on the base frame 1 to protect the electric pump 4, a handle 92 provided on the oil cylinder 2, and casters 10 provided on the base frame 1. The motor protective cover 91 provides protection for the motor 42. The handle 92 is designed to facilitate the movement of the high-level transport top by the operator; The omnidirectional wheels 10 facilitate the movement of the top transporter at a high position.

[0039] In this invention, when the high-level transport jack needs to be used and the hydraulic cylinder 2 needs to be driven for lifting, the operator steps on the foot pedal 83. The foot pedal 83 drives the button contact shaft 831 to press the switch 82, starting the motor 42. The motor 42 drives the eccentric wheel 43 to rotate. During the rotation, the eccentric wheel 43 contacts the plunger 49 and pushes the plunger 49. The plunger 49 then pushes the piston 46 to move within the piston chamber 44, thereby squeezing the hydraulic oil within the piston chamber 44. This pushes open the one-way valve 6 located in the oil inlet passage 411, opening the oil inlet passage 411 and allowing the hydraulic oil to flow through the oil inlet. When the oil passage 411 is pumped into the cylinder 22, it drives the piston rod 23 to lift. When the eccentric wheel 43 stops pushing the plunger 49 during rotation, the piston 46 and plunger 49 are reset by the restoring force of the spring 47. During the reset process of the piston 46 and plunger 49, the hydraulic oil pushes open the one-way valve 6 in the oil suction passage 410, and the hydraulic oil in the oil tank is sucked into the piston chamber 44 through the oil suction passage 410. When the eccentric wheel 43 pushes the plunger 49 again during rotation, the hydraulic oil in the piston chamber 44 is pumped into the cylinder 22 through the oil inlet passage 411 to push the piston rod 23 to lift. During descent, the operator turns handwheel 54, which drives the drain valve stem 52 to rotate. During rotation, the drain valve stem 52 moves backward after engaging with the thread on the drain valve seat 51. The drain valve stem 52 no longer presses against the steel ball 53, and the return oil channel 28 is connected. At this time, the oil in the cylinder 22 is squeezed by the piston rod 23 and the gravity of the supporting object. The oil enters the return oil chamber 26 through the gap and oil hole 27, and then flows back to the oil tank through the return oil channel 28. After descending to the desired position or to the bottom, the operator turns handwheel 54 in the opposite direction to close the drain valve 5.

[0040] Example 2 See Figures 12-13 As shown, the difference between this embodiment and Embodiment 1 lies in the electric pump structure, oil discharge structure, and support frame that drive the hydraulic cylinder. The details regarding the electric pump and oil discharge structure in this embodiment have been fully disclosed in patent publication number CN121225492A, and therefore will not be described in detail here. The difference between this embodiment and patent CN121225492A is that in this embodiment, the switch controlling the continuously variable speed of the electric pump is replaced with the one in embodiment 1 of this application. Figure 11 The switch shown; The scope of protection of this invention 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 invention.

Claims

1. A control method for an electro-hydraulic jack, characterized in that: The control method is as follows: When the lifting operation is under control, the operator turns on the main switch on the control terminal equipment and then presses the lifting switch to send a signal to the main control module. The main control module controls the motor to start through the conduction module one, thereby controlling the electric pump motor to start. The motor drives the pump body to start, pumping hydraulic oil from the oil tank into the oil cylinder to drive the oil cylinder piston rod to perform the lifting operation. When the lifting stops, the operator releases the lifting switch, and the main control module controls the battery, the first conducting module, and the motor to disconnect and stop supplying power to the motor. At the same time, the main control module controls the battery and the two-way connection module to the motor. The main control module controls the motor brake to prevent the oil cylinder from being continuously pumped into the cylinder due to inertia, which would cause the cylinder to rise to a height exceeding the set position.

2. The control method for an electric hydraulic jack according to claim 1, characterized in that: When the motor is braked, the main control module controls the connection between the battery, the second conduction module and the motor, and controls the output voltage to the motor to be lower than the input voltage when the motor is running normally, so as to drive the motor to decelerate. The motor stops after deceleration, reducing inertia and achieving braking.

3. The control method for an electric hydraulic jack according to claim 1, characterized in that: When the motor is braked, or when the main control module controls the battery, the second conduction module and the motor to conduct, the control module controls the motor to rotate in reverse for a short time. By reversing the rotation, the motor is forced to stop, thus achieving braking.

4. The control method for an electric hydraulic jack according to claim 1, characterized in that: When braking the motor, or by controlling the electromagnetic brake through the main control module to lock the motor shaft and drive the motor to stop rotating, braking is achieved.

5. The control method for an electric hydraulic jack according to claim 1, characterized in that: Braking is achieved by controlling the motor to brake, or by controlling the driver through the main control module to drive the brake components to press against the motor shaft and drive the motor to stop rotating.

6. The control method for an electric hydraulic jack according to claim 1, characterized in that: The main control module controls the motor brake instead of controlling the solenoid valve on the oil supply line between the oil tank and the oil cylinder to cut off the oil supply line, thus preventing the oil cylinder from being lifted higher than the set position due to the motor continuously pumping oil into the oil cylinder due to inertia.

7. A control method for an electric hydraulic jack according to claim 2, 3, 4, 5, or 6, characterized in that: After the operator releases the lifting switch, the main control module controls the conduction module two to connect the motor, battery and capacitor, recovering the electrical energy generated by the electric pump motor due to inertia into the battery and / or capacitor, thus recovering the inertial energy of the motor.

8. The control method for an electric hydraulic jack according to claim 1, characterized in that: It also includes real-time monitoring of the current and temperature parameters of the motor during operation. If they are within the set range, the motor will work normally; if they exceed the set range, the main control module will control the motor to stop working. It also includes a current detection unit that establishes communication with the main control module and performs real-time detection of motor current parameters, and a temperature detection unit that detects motor temperature.

9. The control method for an electric hydraulic jack according to claim 8, characterized in that: It also includes a display module controlled by the main control module to display different conditions. During operation, it monitors the battery voltage in real time. When the battery voltage is lower than the set value, the control module controls the display module to start and inform the operator that the battery voltage is low.

10. A control method for an electro-hydraulic jack according to claim 9, characterized in that: The control terminal device and the main control module are connected by wire or wireless means; when using a wireless connection, the control terminal device and the main control module establish a wireless connection using a communication module; the communication module can be either a Bluetooth communication module or a network communication module.

11. The control method for an electric hydraulic jack according to claim 7, characterized in that: After receiving the signal that the rise switch has been released, the main control module pauses for a set time. After the set time is reached, the main control module controls the conduction module two to connect the motor, battery and capacitor, so as to recover the electrical energy generated by the motor of the electric pump due to inertia into the battery and / or capacitor, thus recovering the inertial energy of the motor.

12. An electro-hydraulic high-level conveying jack using the control method described in any one of claims 1-11, characterized in that: Includes a base frame (1), a hydraulic cylinder (2) placed on the base frame (1), and a support frame (3) placed on top of the hydraulic cylinder (2); It also includes an electric pump (4) for driving the cylinder (2) to perform a lifting action; it also includes an oil drain valve (5) set on the upper part of the cylinder (2) for controlling the return of oil in the cylinder (2); the cylinder (2) includes a housing (21), a cylinder body (22) placed in the housing (21), a piston rod (23) placed in the cylinder body (22), and a top cap seat (24) and a top cap (25) connected to the housing (21) and the cylinder body (22). An oil tank is formed between the housing (21) and the cylinder body (22). A gap for return of oil is left between the piston rod (23) and the cylinder body (22). A return oil chamber (26) is provided between the top cap seat (24) and the cylinder body (22). An oil hole (27) is provided on the cylinder body (22) to connect the return oil chamber (26) and the gap. A return oil channel (28) is provided on the top cap seat (24) to connect the oil tank and the return oil chamber (26).

13. The electro-hydraulic high-level transport jack according to claim 12, characterized in that: The drain valve (5) includes a drain valve seat (51) connected to the top cap seat (24), a drain valve stem (52) threadedly connected to the drain valve seat (51), a steel ball (53) disposed in the return oil passage (28) and located between the drain valve stem (52) and the top cap seat (24), a handwheel (54) connected to the drain valve stem (52) for driving the drain valve stem (52) to rotate and open or close the drain valve (5), a torsion spring sleeve (55) connected to the drain valve seat (51), and a torsion spring (56) disposed between the torsion spring sleeve (55) and the handwheel (54).

14. The electro-hydraulic high-level transport jack according to claim 12, characterized in that: The electric pump (4) includes a valve seat (41) connected to the base frame (1), a plunger structure disposed in the valve seat (41) for pressurizing oil in the oil tank to the cylinder (22), a motor (42) connected to the valve seat (41), and an eccentric wheel (43) connected to the motor (42) for driving the plunger structure to operate. The plunger structure includes a piston chamber (44) disposed on the valve seat (41), a spring limiting seat (45) disposed in the piston chamber (44), a piston (46) slidably connected in the piston chamber (44), a spring (47) disposed between the spring limiting seat (45) and the piston (46), a plunger seat (48) connected in the piston chamber (44), and a plunger (49) slidably connected in the plunger seat (48) with one end in contact with the piston (46) and the other end in contact with the eccentric wheel (43); the valve seat (41) is also provided with an oil suction passage (410) connecting the piston chamber (44) and the oil tank, and an oil inlet passage (411) connecting the piston chamber (44) and the cylinder (22).

15. The electro-hydraulic high-level transport jack according to claim 14, characterized in that: It also includes several oil passage holes (412) provided on the piston (46); it also includes seals (413) provided between the piston (46) and the piston chamber (44), between the plunger seat (48) and the piston chamber (44), and between the plunger seat (48) and the plunger (49). It also includes a check valve (6) installed on the oil suction line (410) and the oil inlet line (411) and a safety valve (61) installed on the valve block.

16. The electro-hydraulic high-level transport jack according to claim 12, characterized in that: It also includes a battery cover (7) connected to the oil cylinder (2), a battery holder (71) connected to the battery cover (7), and a battery (72) connected to the battery holder (71); it also includes a foot switch (8) set on the base frame (1) for controlling the opening and closing of the electric pump (4). The foot switch (8) includes a foot bracket (81), a switch (82) set in the foot bracket (81) and connected to the battery holder (71) by a line, a foot (83) movably connected to the foot bracket (81) by a pin, and a button contact shaft (831) set on the foot (83) corresponding to the position of the switch (82) and contacting the switch (82) when the foot (83) is stepped on.

17. The electro-hydraulic high-level transport jack according to claim 16, characterized in that: It also includes a spring post (811) mounted on the footrest (81), a spring shaft (832) mounted on the foot (83), and a spring (833) fitted on the spring post (811) and the spring shaft (832) for pushing the foot (83) to reset; it also includes a foot cover (9) mounted on the base frame (1) to protect the foot switch (8); It also includes a motor guard (91) installed on the base frame (1) to protect the electric pump (4), a handle (92) installed on the oil cylinder (2), and casters (10) installed on the base frame (1).

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