A hydraulic control system for a lifting mechanism

Abstract

This invention provides a hydraulic control system for a lifting mechanism, comprising: a manual control pilot valve group, a first and a second hydraulic control valve group, a second hydraulic control valve group, and a balance valve. The hydraulic control system also includes an electro-hydraulic proportional valve group, whose P and T ports are connected to the input ends of the first and second hydraulic control valve groups via pipelines. The hydraulic control system for the lifting mechanism provided by this invention incorporates both manual and wireless remote control devices. Both operating modes can achieve four control states for the lifting mechanism: holding, floating, powered lifting, and powered lowering. In the default system state, the hydraulic control of the lifting mechanism is directly controlled locally by a control handle. The switching between direct local control and remote control by the control handle is handled by the electro-hydraulic proportional valve group, enabling both local manual control and remote control, thus providing a hardware foundation for intelligent operation.

Description

Technical Field

[0001] This invention relates to the field of hydraulic control systems for lifting mechanisms, and more particularly to a hydraulic control system for a lifting mechanism. Background Technology

[0002] Hydraulic lifts primarily achieve their lifting function through the pressure transmission of hydraulic oil.

[0003] Lifting mechanism hydraulic systems generally have three operating states: holding, raising, and lowering. Manual valve-controlled hydraulic systems are widely used in the railway engineering machinery industry due to their high reliability. Operators switch control modes and control the lifting mechanism's speed by manipulating the displacement of the manual valve spool. Since manual control valves are typically operated via mechanical mechanisms or ropes to move the valve spool, the control terminal is usually located in a specific location, such as the operator's control room.

[0004] Platform structures often need to carry people or goods. Controlling the lifting mechanism of the platform through the operation control room requires the cooperation of multiple people. The platform personnel issue lifting commands to the personnel in the operation control room. After receiving the commands, the personnel in the control room carry out the lifting operation. Since the platform personnel do not have platform control authority, the construction operation is extremely inconvenient. At the same time, when the platform personnel discover faults or abnormalities, they cannot effectively control the emergency situation due to the lack of platform control authority, which poses certain safety hazards.

[0005] Therefore, it is necessary to provide a hydraulic control system for the lifting mechanism to solve the above-mentioned technical problems. Summary of the Invention

[0006] This invention provides a hydraulic control system for a lifting mechanism, which solves the problem that current hydraulic control systems for lifting mechanisms are usually located in a control room, making them inconvenient to operate during actual construction.

[0007] To solve the above-mentioned technical problems, the present invention provides a hydraulic control system for a lifting mechanism, characterized in that it includes:

[0008] Manually control the pilot valve assembly, the first and second hydraulic control valve assemblies, the second hydraulic control valve assembly, and the balance valve;

[0009] The hydraulic control system of the lifting mechanism also includes an electronically controlled proportional valve group. The P port and T port of the electronically controlled proportional valve group are connected to the input ends of the first and second hydraulically controlled valve groups and the second hydraulically controlled valve group through pipelines. The P1 port, T1 port, A1 port and B1 port of the electronically controlled proportional valve group are connected to the P1 port, T1 port and two working ports of the manual control pilot valve group through pipelines, respectively. The A port and B port of the electronically controlled proportional valve group are connected to the control ends of the second hydraulically controlled valve group and the first and second hydraulically controlled valve groups, respectively. The output ends of the first and second hydraulically controlled valve groups and the second hydraulically controlled valve groups are connected to the input end of the balance valve through pipelines. The output end of the balance valve is connected to the hydraulic cylinder through pipelines.

[0010] A controller, which is connected to the output terminal of the electronically controlled proportional valve group;

[0011] The output of the remote controller, used for remotely controlling the state of the electronically controlled proportional valve group, is connected to the input of the controller via a receiver.

[0012] Preferably, the valve consists of a check valve, a two-position two-way solenoid valve, a three-position four-way proportional valve, a relief valve, and four two-position three-way solenoid valves.

[0013] The input end of the first two-position three-way solenoid valve is connected to the P port of the electronically controlled proportional valve group, one output end of the first two-position three-way solenoid valve is connected to the P1 port of the electronically controlled proportional valve group, and the other output end is connected to the input end of the one-way valve and the input end of the two-position two-way solenoid valve respectively through a three-way pipe.

[0014] The two output terminals of the second two-position three-way solenoid valve are respectively connected to the T port and T1 port of the electronically controlled proportional valve group, and the input terminal of the second two-position three-way solenoid valve is connected to the output terminal of the relief valve through a three-way pipe; the output terminal of the two-way solenoid valve is connected to the three-position four-way proportional valve and the input terminal of the second two-position three-way solenoid valve through a three-way pipe.

[0015] The two output terminals of the third two-position three-way solenoid valve are respectively connected to the A oil port and A1 oil port of the electronically controlled proportional valve group, and the output terminal of the three-position four-way proportional valve is respectively connected to the input terminal of the third two-position three-way solenoid valve and the input terminal of the overflow valve through a three-way pipe.

[0016] The input end of the fourth two-position three-way solenoid valve is connected to the output end of the three-position four-way proportional valve, and the two output ends of the fourth two-position three-way solenoid valve are respectively connected to the B port and B1 port of the electronically controlled proportional valve group.

[0017] The output end of the one-way valve is connected to the input end of the three-position four-way proportional valve.

[0018] Preferably, the hydraulic control system of the lifting mechanism further includes a mounting box for carrying the controller and the electronically controlled proportional valve group. An air guide cylinder is installed on one side of the mounting box, and an exhaust plate is installed on one side of the inner wall of the mounting box. One side of the air guide cylinder is connected to one side of the exhaust plate through an air guide pipe. A drive component is provided inside the air guide cylinder.

[0019] Preferably, the driving component includes a circular block located on one side of the air duct. A guide cylinder is symmetrically fixedly connected to one side of the circular block. A guide rod is slidably connected inside the guide cylinder. One end of the guide rod is fixedly connected to one side of the inner wall of the air duct. A flange is provided at one end of the surface of the guide cylinder. A first elastic element is sleeved on the surface of the guide rod and on one side of the flange.

[0020] Preferably, a blower is fixedly installed on one side of the mounting box, and the output end of the blower is connected to a connecting pipe. One end of the connecting pipe is connected to one end of the air guide tube, and the connecting pipe is on the side away from the circular block.

[0021] Preferably, the mounting box has multiple air outlets on one side, and a sealing element is installed on one side of the mounting box outside the air outlets. The sealing element includes multiple sealing strips, and adjacent sealing strips are fixedly connected by connecting blocks. A connecting arm is fixedly connected to one side of the outermost sealing strip.

[0022] Preferably, a drive arm is fixedly connected to one side of the circular block, one end of the drive arm passes through the air guide tube and extends to the outside of the air guide tube, and one end of the connecting arm is fixedly connected to the drive arm.

[0023] Preferably, the exhaust plate includes an exhaust plate with a hollow internal structure, and a plurality of exhaust holes are provided in a rectangular array on one side of the exhaust plate. A blocking mechanism is provided inside the exhaust plate.

[0024] Preferably, the blocking mechanism includes multiple sealing blocks, which are fixedly connected by connecting rods and arranged in a rectangular array. A fixing plate is fixedly connected to one side of one of the connecting rods, and a telescopic rod is fixedly connected to one side of the fixing plate. One end of the telescopic rod is fixedly connected to one side of the inner wall of the exhaust plate.

[0025] Preferably, a second elastic element is sleeved on one side of the fixing plate and on the surface of the telescopic rod.

[0026] Compared with related technologies, the hydraulic control system for the lifting mechanism provided by the present invention has the following advantages:

[0027] This invention provides a hydraulic control system for a lifting mechanism, which includes both manual and wireless remote control devices. Both operating modes can achieve four control states for the lifting mechanism: holding, floating, powered lifting, and powered lowering. In the default system state, the hydraulic control of the lifting mechanism is directly controlled locally by a control handle. Switching between direct local control and remote control is achieved via an electronically controlled proportional valve group, enabling both local manual and remote control, thus providing a hardware foundation for intelligent operation.

[0028] Furthermore, by rationally designing the hydraulic control valve group main valve core control oil circuit and adding a one-way damping oil circuit at an appropriate position, the smooth speed control of the hydraulic cylinder under gravity is achieved. The lifting mechanism floats and descends under gravity, and the lowering of the lifting mechanism can be achieved without pressure oil, thereby achieving energy-saving control.

[0029] Furthermore, in wireless remote control mode, the electronically controlled proportional valve group controls the current of the three-position four-way proportional valve to control the amount of hydraulic oil piloted by the main valve core of the hydraulic valve group, thereby controlling the opening of the main valve core of the hydraulic valve group and realizing the control of the hydraulic oil flow of the lifting mechanism hydraulic cylinder. Attached Figure Description

[0030] Figure 1 A schematic block diagram of the first embodiment of the hydraulic control system for the lifting mechanism provided by the present invention;

[0031] Figure 2 A schematic diagram of the principle of power lifting in the hydraulic control system of the lifting mechanism provided by the present invention;

[0032] Figure 3 A schematic diagram illustrating the principle of the power descent of the hydraulic control system for the lifting mechanism provided by this invention;

[0033] Figure 4 A schematic diagram of the floating position of the hydraulic control system for the lifting mechanism provided by the present invention;

[0034] Figure 5 A schematic diagram of the structure of the electrically controlled proportional valve group of the hydraulic control system for the lifting mechanism provided by the present invention;

[0035] Figure 6 A schematic diagram of the second embodiment of the hydraulic control system for the lifting mechanism provided by the present invention;

[0036] Figure 7 for Figure 6 The diagram shows the overall structure.

[0037] Figure 8 for Figure 7 The side view shown;

[0038] Figure 9 for Figure 6 The diagram shows the structure of the drive component;

[0039] Figure 10 for Figure 6 The diagram shows the structure of the blocking mechanism.

[0040] Numbering on the map:

[0041] 1. Hydraulic cylinder; 2. First hydraulic control valve assembly; 3. Manual control pilot valve assembly.

[0042] 4. Electrically controlled proportional valve assembly; 401. Two-position three-way solenoid valve; 402. Check valve; 403. Two-position two-way solenoid valve; 404. Three-position four-way proportional valve; 405. Relief valve.

[0043] 5. Controller, 6. Remote controller, 7. Receiver, 8. Second hydraulic valve assembly, 9. Balancing valve, 10. Back pressure valve.

[0044] 11. Installation box; 12. Air delivery tube.

[0045] 13. Drive assembly; 131. Circular block; 132. Guide cylinder; 133. Guide rod; 134. First elastic element; 135. Drive arm.

[0046] 14. Air supply mechanism,

[0047] 15. Blocking mechanism; 151. Sealing block; 152. Connecting rod; 153. Fixing plate; 154. Telescopic rod; 155. Second elastic element.

[0048] 16. Exhaust panel; 161. Panel body; 162. Exhaust hole; 17. Air outlet.

[0049] 18. Seal; 181. Sealing strip; 182. Connecting block; 183. Connecting arm.

[0050] 19. Mounting plate. Detailed Implementation

[0051] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0052] First Embodiment

[0053] Please refer to the following: Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 ,in, Figure 1 A schematic block diagram of the first embodiment of the hydraulic control system for the lifting mechanism provided by the present invention; Figure 2 A schematic diagram of the principle of power lifting in the hydraulic control system of the lifting mechanism provided by the present invention; Figure 3A schematic diagram illustrating the principle of the power descent of the hydraulic control system for the lifting mechanism provided by this invention; Figure 4 A schematic diagram of the floating position of the hydraulic control system for the lifting mechanism provided by the present invention; Figure 5 A schematic diagram of the electrically controlled proportional valve group of the hydraulic control system for the lifting mechanism provided by the present invention. The hydraulic control system for the lifting mechanism includes:

[0054] Manually control pilot valve group 3, first and second hydraulic control valve groups, second hydraulic control valve group 8, balance valve 9;

[0055] The hydraulic control system of the lifting mechanism also includes an electronically controlled proportional valve group 4. The P port and T port of the electronically controlled proportional valve group 4 are connected to the input ends of the first and second hydraulically controlled valve groups and the second hydraulically controlled valve group 8 through pipelines. The P1 port, T1 port, A1 port and B1 port of the electronically controlled proportional valve group 4 are connected to the P1 port, T1 port and two working ports of the manual control pilot valve group 3 through pipelines respectively. The A port and B port of the electronically controlled proportional valve group 4 are connected to the control ends of the second hydraulically controlled valve group 8 and the first and second hydraulically controlled valve groups respectively. The output ends of the first and second hydraulically controlled valve groups and the second hydraulically controlled valve group 8 are connected to the input end of the balance valve 9 through pipelines. The output end of the balance valve 9 is connected to the hydraulic cylinder 1 through pipelines.

[0056] Controller 5, which is connected to the output terminal of the electronically controlled proportional valve group 4;

[0057] The output of the remote controller 6, used to remotely control the state of the electronically controlled proportional valve group 4, is connected to the input of the controller 5 via a receiver.

[0058] The electronically controlled proportional valve group includes a one-way valve 402, a two-position two-way solenoid valve 403, a three-position four-way proportional valve 404, an overflow valve 405, and four two-position three-way solenoid valves 401.

[0059] The input end of the first two-position three-way solenoid valve 401 is connected to the P port of the electronically controlled proportional valve group, one output end of the first two-position three-way solenoid valve 401 is connected to the P1 port of the electronically controlled proportional valve group, and the other output end is connected to the input end of the one-way valve 402 and the input end of the two-position two-way solenoid valve 403 respectively through a three-way pipe.

[0060] The two output terminals of the second two-position three-way solenoid valve 401 are respectively connected to the T port and T1 port of the electronically controlled proportional valve group, and the input terminal of the second two-position three-way solenoid valve 401 is connected to the output terminal of the relief valve 405 through a three-way pipe; the output terminal of the two-way solenoid valve 403 is connected to the three-position four-way proportional valve 404 and the input terminal of the second two-position three-way solenoid valve 401 through a three-way pipe.

[0061] The two output terminals of the third two-position three-way solenoid valve 401 are respectively connected to the A oil port and A1 oil port of the electronically controlled proportional valve group, and the output terminal of the three-position four-way proportional valve 404 is respectively connected to the input terminal of the third two-position three-way solenoid valve 401 and the input terminal of the overflow valve 405 through a three-way pipe.

[0062] The input end of the fourth two-position three-way solenoid valve 401 is connected to the output end of the three-position four-way proportional valve 404, and the two output ends of the fourth two-position three-way solenoid valve 401 are respectively connected to the B port and B1 port of the electronically controlled proportional valve group.

[0063] The output end of the one-way valve 402 is connected to the input end of the three-position four-way proportional valve 404.

[0064] Both operating modes can achieve four control states for the lifting mechanism: holding, floating, powered lifting, and powered lowering. In the default system state, the hydraulic control of the lifting mechanism is directly controlled locally by the control handle. The switching between direct local control and remote control of the control handle, as well as the electrical signal enable logic for remote control, are all switched and controlled by an electronically controlled proportional valve group, with the remote control mode having the highest priority.

[0065] In manual control mode, all electromagnets of the electronic proportional valve group 4 are de-energized, and the oil ports P and P1, T and T1, A and A1, and B and B1 of the electronic proportional valve group 4 are connected. P is the high-pressure oil port of the hydraulic system, connected to the outlet of the hydraulic pump, and T is the return oil port of the hydraulic system, connected to the oil tank. The operator controls the control handle in the cab, and the handle directly controls the valve core stroke of the manual control pilot valve group 3 through the pull rod or pull cable, so as to realize the functions of holding, floating, power lifting and power lowering of the lifting mechanism.

[0066] The working status and working principle of each valve in manual control mode are as follows:

[0067] The lifting mechanism maintains: the oil ports P and P1, T and T1, A and A1, and B and B1 of the electronically controlled proportional valve group 4 are connected, and the pilot valve group 3 is manually controlled. Figure 1 When the position is shown, the control oil circuits A1 and B1 of the first hydraulic control valve group 2 and the second hydraulic control valve group 8 are blocked, the main valve core is in the neutral position under the action of the spring, no oil flows in or out of the rod chamber and rodless chamber of the hydraulic cylinder 1, and the lifting mechanism is in the holding state.

[0068] Lifting mechanism power lifting: manual control pilot valve group 3 in Figure 2When the position shown is reached, the valve core of the manual control pilot valve group 3 is in the rightmost position. The high-pressure oil in the hydraulic system is connected to port B of the electronically controlled proportional valve group 4 via the manual control pilot valve group 3. Since B and B1 are connected, the main valve core of the first hydraulically controlled valve group 2 is supplied with high-pressure oil to the left. The main valve core moves to the right, and the main valve of the first hydraulically controlled valve group 2 is in the left position. The high-pressure oil in the hydraulic system flows to the rodless chamber of the hydraulic cylinder 1 via the main valve core of the first hydraulically controlled valve group 2. The pressure oil in the rodless chamber pushes the valve core of the balance valve 9 to open. At the same time, the hydraulic system return oil circuit fluid... The pilot valve group 3 is manually connected to port A of the proportional valve group 4. Since A and A1 are connected and A1 is connected to the oil tank, under the action of the oil in the rod chamber of the hydraulic cylinder 1, there will be a pressure difference between the left and right ends of the main valve core of the second hydraulic control valve group 8. As a result, the main valve core moves to the left, and the second hydraulic control valve group 8 works in the rightmost working position. The oil in the rod chamber of the hydraulic cylinder 1 flows back to the oil tank through the balance valve 9 and the main valve core of the second hydraulic control valve group 8. The piston rod of the hydraulic cylinder 1 continues to extend, thereby realizing the power lifting of the lifting mechanism.

[0069] Lifting mechanism power descent: Manual control pilot valve group 3 in Figure 3 When the position shown is reached, the manual control pilot valve group 3 valve core is in the leftmost position. The high-pressure oil of the hydraulic system is connected to port A of the electronically controlled proportional valve group 4 via the manual control pilot valve group 3. Since A and A1 are connected, the high-pressure oil flows to the left of the main valve core of the second hydraulic control valve group 8, and the main valve core moves to the right (in order to reduce the opening speed of the main valve core and achieve a damping effect, the control oil of the main valve core is equipped with a one-way damping orifice). The main valve of the second hydraulic control valve group 8 is in the left position. The high-pressure oil of the hydraulic system flows to the rod chamber of the hydraulic cylinder 1 through the one-way valve of the main valve core of the second hydraulic control valve group 8 and the balance valve. At the same time, the hydraulic system return oil flows through the manual control pilot valve group 3 to the rod chamber of the hydraulic cylinder 1. The pilot valve group 3 is connected to port B of the electronically controlled proportional valve group 4. Since B and B1 are connected, a portion of the oil in the rodless chamber of the hydraulic cylinder 1 flows back to the oil tank through the one-way valve of the main valve core of the first hydraulic control valve group 2. A pressure difference will exist between the left and right ends of the main valve core of the first hydraulic control valve group 2, causing the main valve core to move to the left. The first hydraulic control valve group 2 is now in its rightmost working position. The oil in the rodless chamber of the hydraulic cylinder 1 flows back to the oil tank through the main valve core of the first hydraulic control valve group 2, and the piston rod of the hydraulic cylinder 1 continues to retract, thereby achieving the power descent of the lifting mechanism. The relief valve 405 is used to limit the maximum pressure of the descent control oil circuit. To reduce the opening speed of the main valve core and to provide a damping effect, the control oil of the main valve core is equipped with a one-way damping orifice.

[0070] Lifting mechanism floating state: Manually control pilot valve group 3 in Figure 4When the position is shown, the valve core of the manual control pilot valve group 3 is working in the second working position on the left. The high-pressure oil at port P of the hydraulic system and the low-pressure oil at port T of the hydraulic system are connected to ports A and B of the electronically controlled proportional valve group 4 via the main valve core of the manual control pilot valve group 3. Since A and A1 are connected and B and B1 are connected, the first hydraulic control valve group 2 and the second hydraulic control valve group 8 are in a floating state. Under the influence of gravity, the hydraulic fluid in the rodless chamber of hydraulic cylinder 1 has a certain pressure. The pressure is high on the right side of the main valve core of the first hydraulic control valve group 2, so the valve core moves to the left and the first hydraulic control valve group 2 operates in its rightmost position. The hydraulic fluid in the rodless chamber is connected to the return oil circuit through the main valve core of the first hydraulic control valve group 2. The back pressure valve 10 allows a certain back pressure in the return oil circuit. Under the action of this back pressure, there is a certain pressure on the right side of the second hydraulic control valve group 8. Since the valve core on the left side is connected to A1 and directly connected to the return oil circuit, the valve core moves to the left and the second hydraulic control valve group 8 operates in its right position. The outlet of the main valve core of the second hydraulic control valve group 8 is connected to the return oil circuit and enters the rod chamber of hydraulic cylinder 1 to maintain the oil replenishment state. The lifting mechanism will float and descend under the influence of gravity. When the lifting mechanism reaches the lowest mechanical position, there is no pressure in the rodless chamber of hydraulic cylinder 1. The pressure of the main valve cores of the first hydraulic control valve group 2 and the second hydraulic control valve group 8 is the same, and they return to the center under the action of the spring.

[0071] In wireless remote control mode: The operator sends control commands via remote controller 6. Receiver 7 receives the wireless signal and converts it into a bus signal, which is then sent to controller 5. Controller 5 controls the working state of each electromagnet and proportional electromagnet in the electronically controlled proportional valve group 4 according to the bus signal magnitude, thereby simulating all working states of the pilot valve group 3 under manual control. This invention not only needs to achieve four states of the lifting mechanism: powered ascent, powered descent, floating, and holding, but also achieves stepless speed control of the lifting mechanism's ascent / descent by configuring proportional valves. The electronically controlled proportional valve group 4 consists of a two-position three-way solenoid valve 401, a one-way valve 402, a two-position two-way solenoid valve 403, a three-position four-way proportional valve 404, and an overflow valve 405. The two-position three-way solenoid valve 401 is used to realize the connection and switching of oil ports P and P1, T and T1, A and A1, and B and B1. The one-way valve 402 prevents the backflow of high-pressure oil in the oil pipe when the lifting mechanism floats and descends. The two-position two-way solenoid valve 403 is used to realize the short connection of oil supply line P and oil return line T. The three-position four-way proportional valve 404 is used to realize the magnitude and direction of oil pressure at ports A and B. The relief valve 405 is used to limit the magnitude of oil supply pressure when the lifting mechanism is powered to descend.

[0072] Operating status and working principle of each valve in wireless remote control mode:

[0073] Lifting mechanism holding: When all two-position three-way solenoid valves 401 are energized, ports P and P1, T and T1, A and A1, and B and B1 are closed, and ports A and B are connected to the working ports of the three-position four-way proportional valve 404. When neither the two-position two-way solenoid valve 403 nor the three-position four-way proportional valve 404 is energized, ports A and B of the electronically controlled proportional valve group are blocked, and the main valve core control oil circuit of the first hydraulic control valve group 2 and the second hydraulic control valve group 8 is blocked. The main valve core returns to center under the action of the spring, and no oil flows in or out of the rod chamber and rodless chamber of the hydraulic cylinder 1, and the lifting mechanism is in the holding state;

[0074] Lifting mechanism power lifting: All 2-position 3-way solenoid valves 401 are energized, and ports P and P1, T and T1, A and A1, and B and B1 are closed. Ports A and B are connected to the working ports of the 3-position 4-way proportional valve 404. When the 2-position 2-way solenoid valve 403 is energized, the right proportional solenoid of the 3-position 4-way proportional valve 404 is energized, and the 3-position 4-way proportional valve operates in the right position. The high-pressure oil circuit at port P is connected to port B via the 2-position 3-way solenoid valve 401 and the 3-position 4-way proportional valve 404. The return oil circuit at port T is connected to port A via the 2-position 3-way solenoid valve 401 and the 3-position 4-way proportional valve 404. High-pressure oil flows to the left of the main valve core of the first hydraulic control valve group 2. When the main valve core moves to the right, the main valve of the first hydraulic control valve group 2 operates in the left position. The high-pressure oil in the hydraulic system flows through the main valve core of the first hydraulic control valve group 2 to the rodless chamber of the hydraulic cylinder 1. The pressure oil in the rodless chamber pushes the valve core of the balance valve 9 to open. At the same time, the hydraulic system return oil circuit is connected to port A of the electronically controlled proportional valve group 4 via the manual control pilot valve group 3. Since A and A1 are connected and A1 is connected to the oil tank, under the action of the oil in the rod chamber of the hydraulic cylinder 1, there will be a pressure difference between the left and right ends of the main valve core of the second hydraulic control valve group 8. As a result, the main valve core moves to the left, and the second hydraulic control valve group 8 operates in the rightmost working position. The oil in the rod chamber of the hydraulic cylinder 1 flows back to the oil tank through the balance valve 9 and the main valve core of the second hydraulic control valve group 8. The piston rod of the hydraulic cylinder 1 continues to extend, thereby realizing the power lifting of the lifting mechanism.

[0075] Lifting mechanism power descent: All 2-position 3-way solenoid valves 401 are energized, and ports P and P1, T and T1, A and A1, and B and B1 are closed. Ports A and B are connected to the working ports of the 3-position 4-way proportional valve 404. 2-position 2-way solenoid valve 403 is energized, and the left proportional solenoid of the 3-position 4-way proportional valve 404 is energized. The 3-position 4-way proportional valve operates in the left position. The high-pressure oil circuit at port P is connected to port A via 2-position 3-way solenoid valve 401 and the 3-position 4-way proportional valve 404. The return oil circuit at port T is connected to port B via 2-position 3-way solenoid valve 401 and the 3-position 4-way proportional valve 404. The main valve spool of the second hydraulic control valve group 8 is in the left position, allowing high-pressure oil to flow through. The main valve spool moves to the right (to reduce the opening speed of the main valve spool and provide a damping effect, the control oil in the main valve spool is equipped with a one-way damping orifice). The main valve of the second hydraulic control valve group 8 operates in the left position. High-pressure oil from the hydraulic system flows through the main valve spool of the second hydraulic control valve group 8 and the one-way valve of the balance valve to the rod chamber of the hydraulic cylinder 1. Simultaneously, the hydraulic system return oil is connected to port B of the electronically controlled proportional valve group 4 via the manual control pilot valve group 3. Because B and B1 are connected, the hydraulic... A portion of the oil in the rodless chamber of hydraulic cylinder 1 connects to B1 via the one-way valve of the main valve core of the first hydraulic control valve group 2, thus flowing back to the oil tank. A pressure difference exists between the left and right ends of the main valve core of the first hydraulic control valve group 2, causing the main valve core to move to the left. The first hydraulic control valve group 2 operates in its rightmost working position. The oil in the rodless chamber of hydraulic cylinder 1 flows back to the oil tank via the main valve core of the first hydraulic control valve group 2, and the piston rod of hydraulic cylinder 1 continues to retract, thereby achieving the power descent of the lifting mechanism. The relief valve 405 is used to limit the maximum pressure of the descent control oil circuit. To reduce the opening speed of the main valve core and to provide a damping effect, the control oil of the main valve core is equipped with a one-way damping orifice.

[0076] Lifting mechanism floating state: All two-position three-way solenoid valves 401 are energized, and ports P and P1, T and T1, A and A1, and B and B1 are closed. Ports A and B are connected to the working ports of the three-position four-way proportional valve 404. Two-position two-way solenoid valve 403 is de-energized, and the left proportional solenoid of the three-position four-way proportional valve 404 is energized. The three-position four-way proportional valve is in the left position. The high-pressure oil circuit at port P is connected to port A through two-position three-way solenoid valve 401 and three-position four-way proportional valve 404. The return oil circuit at port T is connected to port B through two-position three-way solenoid valve 401 and three-position four-way proportional valve 404. Since the high-pressure oil at port P is connected to the return oil circuit at port T when two-position two-way solenoid valve 403 is de-energized, ports A and B are connected to T. The first hydraulic control valve group 2 and the second hydraulic control valve group 8 are in a floating state. Under the influence of gravity, the hydraulic fluid in the rodless chamber of hydraulic cylinder 1 has a certain pressure. The pressure is high on the right side of the main valve core of the first hydraulic control valve group 2, so the valve core moves to the left and the first hydraulic control valve group 2 operates at its rightmost position. The hydraulic fluid in the rodless chamber is connected to the return oil circuit through the main valve core of the first hydraulic control valve group 2. The back pressure valve 10 creates a certain back pressure in the circuit. Under the action of this back pressure, there is a certain pressure on the right side of the second hydraulic control valve group 8. The valve core on the left side is connected to A1, directly connecting to the circuit. Therefore, the valve core moves to the left and the second hydraulic control valve group 8 operates at its rightmost position. The outlet of the main valve core of the second hydraulic control valve group 8 is connected to the return oil circuit and enters the rod chamber of hydraulic cylinder 1, maintaining the oil replenishment state. The lifting mechanism will float and descend under the influence of gravity. When the lifting mechanism reaches the lowest position, there is no pressure in the rodless chamber of hydraulic cylinder 1, and the pressure of the main valve cores of the first hydraulic control valve group 2 and the second hydraulic control valve group 8 is the same. Under the action of the spring, the mechanism returns to the center.

[0077] Compared with related technologies, the hydraulic control system for the lifting mechanism provided by the present invention has the following advantages:

[0078] By setting up both manual and wireless remote control devices, the lifting mechanism can achieve four control states in both working modes: holding, floating, powered lifting, and powered lowering. In the default system state, the hydraulic control of the lifting mechanism is directly controlled locally by the control handle. The switching between direct local control and remote control of the control handle is handled by an electronically controlled proportional valve group, which not only enables local manual control but also remote control, providing a hardware foundation for intelligent operation.

[0079] Furthermore, by rationally designing the hydraulic control valve group main valve core control oil circuit and adding a one-way damping oil circuit at an appropriate position, the smooth speed control of the hydraulic cylinder under gravity is achieved. The lifting mechanism floats and descends under gravity, and the lowering of the lifting mechanism can be achieved without pressure oil, thereby achieving energy-saving control.

[0080] Furthermore, in wireless remote control mode, the electronically controlled proportional valve group controls the current of the three-position four-way proportional valve to control the amount of hydraulic oil piloted by the main valve core of the hydraulic valve group, thereby controlling the opening of the main valve core of the hydraulic valve group and realizing the control of the hydraulic oil flow of the lifting mechanism hydraulic cylinder.

[0081] Second Embodiment

[0082] Please refer to the following: Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10 Based on the hydraulic control system for the lifting mechanism provided in the first embodiment of this application, the second embodiment of this application proposes another hydraulic control system for the lifting mechanism. The second embodiment is merely a preferred embodiment of the first embodiment, and the implementation of the second embodiment will not affect the separate implementation of the first embodiment.

[0083] Specifically, the difference in the hydraulic control system for the lifting mechanism provided in the second embodiment of this application is that the hydraulic control system for the lifting mechanism further includes a mounting box 11 for carrying the controller and the electronically controlled proportional valve group 4. An air guide cylinder 12 is installed on one side of the mounting box 11, and an exhaust plate 16 is installed on one side of the inner wall of the mounting box 11. One side of the air guide cylinder 12 is connected to one side of the exhaust plate 16 through an air guide pipe. A drive assembly 113 is provided inside the air guide cylinder 12.

[0084] The installation box 11 is equipped with a temperature sensor to detect the temperature inside the installation box 11. When the temperature is higher than the set threshold, the blower can be turned on to dissipate heat inside the installation box 11. Multiple installation plates 19 are installed inside the installation box and in front of the exhaust plate 16 for installing devices such as the controller 5. The front of the installation box 11 is provided with a door.

[0085] The drive assembly 13 includes a circular block 131 located on one side of the air duct. A guide cylinder 132 is symmetrically fixedly connected to one side of the circular block 131. A guide rod 133 is slidably connected inside the guide cylinder 132. One end of the guide rod 133 is fixedly connected to one side of the inner wall of the air duct 12. A flange is provided on one end of the surface of the guide cylinder 132. A first elastic element 134 is sleeved on the surface of the guide rod 133 and on one side of the flange.

[0086] The diameter of the circular block 131 is the same as the diameter of the inner cavity of the air guide cylinder 12. The cross-section of the guide rod 133 is rectangular. The inner cavity of the guide cylinder 132 is set as a rectangular cavity adapted to the guide rod 133. The outer diameter of the first elastic element 134 is smaller than the diameter of the flange. The first elastic element 134 is preferably set as a spring.

[0087] A blower 141 is fixedly installed on one side of the mounting box 11. The output end of the blower 141 is connected to a connecting pipe 142. One end of the connecting pipe 142 is connected to one end of the air guide tube 12, and the connecting pipe 142 is on the side away from the circular block 131.

[0088] The mounting box 11 has multiple air outlets 17 on one side. A sealing element 18 is installed on one side of the mounting box 11 and outside the air outlets 17. The sealing element 18 includes multiple sealing strips 181. Adjacent sealing strips 181 are fixedly connected by connecting blocks 182. A connecting arm 183 is fixedly connected to one side of the outermost sealing strip 181.

[0089] The air outlet 17 is used to discharge hot air from inside the mounting box 11, and the area of ​​the sealing strip 181 is the same as or slightly larger than that of the air outlet 17.

[0090] A drive arm 135 is fixedly connected to one side of the circular block 131. One end of the drive arm 135 passes through the air guide cylinder 12 and extends to the outside of the air guide cylinder 12. One end of the connecting arm 183 is fixedly connected to the drive arm 135.

[0091] The connection between the drive arm 135 and the air guide cylinder 12 is treated with a straight mechanical seal.

[0092] The exhaust plate 16 includes an exhaust plate 16, the interior of the exhaust plate 16 is configured as a cavity structure, one side of the exhaust plate 16 has a plurality of exhaust holes 162 arranged in a rectangular array, and the interior of the exhaust plate 16 is provided with a blocking mechanism 15.

[0093] The blocking mechanism 15 includes multiple sealing blocks 151, which are fixedly connected by connecting rods 152 and arranged in a rectangular array. A fixing plate 153 is fixedly connected to one side of one of the connecting rods 152, and a telescopic rod 154 is fixedly connected to one side of the fixing plate 153. One end of the telescopic rod 154 is fixedly connected to one side of the inner wall of the exhaust plate 16.

[0094] The diameter of the sealing block 151 is the same as or slightly larger than that of the exhaust hole 162. The telescopic rod 154 includes an outer cylinder, inside which a piston block is provided. An inner rod is fixedly connected to one side of the piston block. One end of the inner rod passes through the outer cylinder and extends to the outside of the outer cylinder. The inner rod is fixed to the fixing plate 153. The outer cylinder is fixedly connected to one side of the inner wall of the plate 161. By setting the telescopic rod, the fixing plate 153 can be limited. A support rod is connected to the side of the sealing block 151 away from the fixing plate 153. A pulley is provided at the bottom of the support rod to support the entire blocking mechanism 15, so that it can more stably limit the exhaust hole 162 and move more stably.

[0095] A second elastic element 155 is sleeved on one side of the fixing plate 153 and on the surface of the telescopic rod 154.

[0096] The second elastic element 155 is preferably a spring.

[0097] When the temperature sensor detects the temperature inside the mounting box 11, and the temperature is higher than the set threshold, the blower 141 is turned on, and the airflow enters the air guide tube 12 through the connecting pipe 142. Since the air guide tube is located inside the circular block 131, the airflow will push the circular block 131 to move inside the guide tube 132, and push the guide tube 132 to slide along the guide rod 133 while compressing the first elastic element 134. When the circular block 131 moves to a position where it is misaligned with the air guide tube, the airflow can enter the interior of the exhaust plate 16 along the air guide tube.

[0098] During the movement of the circular block 131, the drive arm 135 is pushed to move along with it. At this time, the drive arm 135 can push the connecting arm 183 to move to the outside of the mounting box 11, so that the connecting arm 183 can drive the sealing strip 181 to the air outlet 17. At this time, the hot air inside the mounting box 11 can be discharged through the air outlet 17.

[0099] After the airflow enters the interior of the exhaust plate 16, the initial multiple exhaust holes 162 are blocked by the sealing block 151. At this time, the airflow gathers inside the exhaust plate 16. As the air pressure continues to increase, it pushes the fixing plate 153. The fixing plate 153 compresses the second elastic element 155, causing the sealing block 151 to be misaligned with the exhaust holes 162. At this time, the airflow can be evenly discharged through the multiple exhaust holes 162, so that the airflow can act evenly on the equipment on the inner wall of the mounting box 11, avoiding the airflow from being concentrated and discharged from the exhaust holes 162 corresponding to the air duct, causing uneven airflow on the equipment, and improving the heat dissipation effect.

[0100] By setting the driving component 13 inside the air duct 12 to cooperate with the airflow for heat dissipation, the sealing component 18 can be offset from the air outlet 17, so that the hot airflow inside the mounting box 11 can be discharged. When heat dissipation is not performed, the sealing component 18 seals the air outlet 17 to prevent external dust and foreign objects from entering the interior of the mounting box 11 through the air outlet 17.

[0101] Furthermore, by setting up the blocking mechanism 15, the airflow entering the exhaust plate 16 can be blown out evenly through the exhaust hole 162 to cool the equipment inside the mounting box 11. This allows the airflow to act evenly on each piece of equipment inside, preventing the airflow from concentrating in one place and leaving other areas without sufficient airflow, thus improving the heat dissipation effect.

[0102] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A hydraulic control system for a lifting mechanism, characterized in that, include: Manually control the pilot valve assembly, the first and second hydraulic control valve assemblies, the second hydraulic control valve assembly, and the balance valve; The hydraulic control system of the lifting mechanism also includes an electronically controlled proportional valve group. The P port and T port of the electronically controlled proportional valve group are connected to the input ends of the first and second hydraulically controlled valve groups and the second hydraulically controlled valve group through pipelines. The P1 port, T1 port, A1 port and B1 port of the electronically controlled proportional valve group are connected to the P1 port, T1 port and two working ports of the manual control pilot valve group through pipelines, respectively. The A port and B port of the electronically controlled proportional valve group are connected to the control ends of the second hydraulically controlled valve group and the first and second hydraulically controlled valve groups, respectively. The output ends of the first and second hydraulically controlled valve groups and the second hydraulically controlled valve groups are connected to the input end of the balance valve through pipelines. The output end of the balance valve is connected to the hydraulic cylinder through pipelines. A controller, which is connected to the output terminal of the electronically controlled proportional valve group; The remote controller is used to remotely control the state of the electronically controlled proportional valve group. The output of the remote controller is connected to the input of the controller through a receiver. The electronically controlled proportional valve group includes a check valve, a two-position two-way solenoid valve, a three-position four-way proportional valve, an overflow valve, and four two-position three-way solenoid valves. The input end of the first two-position three-way solenoid valve is connected to the P port of the electronically controlled proportional valve group, one output end of the first two-position three-way solenoid valve is connected to the P1 port of the electronically controlled proportional valve group, and the other output end is connected to the input end of the one-way valve and the input end of the two-position two-way solenoid valve respectively through a three-way pipe. The two output terminals of the second two-position three-way solenoid valve are respectively connected to the T port and T1 port of the electronically controlled proportional valve group, and the input terminal of the second two-position three-way solenoid valve is connected to the output terminal of the relief valve through a three-way pipe; the output terminal of the two-way solenoid valve is connected to the three-position four-way proportional valve and the input terminal of the second two-position three-way solenoid valve through a three-way pipe. The two output terminals of the third two-position three-way solenoid valve are respectively connected to the A oil port and A1 oil port of the electronically controlled proportional valve group, and the output terminal of the three-position four-way proportional valve is respectively connected to the input terminal of the third two-position three-way solenoid valve and the input terminal of the overflow valve through a three-way pipe. The input end of the fourth two-position three-way solenoid valve is connected to the output end of the three-position four-way proportional valve, and the two output ends of the fourth two-position three-way solenoid valve are respectively connected to the B port and B1 port of the electronically controlled proportional valve group. The output end of the one-way valve is connected to the input end of the three-position four-way proportional valve.

2. The hydraulic control system for the lifting mechanism according to claim 1, characterized in that, The hydraulic control system of the lifting mechanism also includes a mounting box for carrying the controller and the electronically controlled proportional valve group. An air guide cylinder is installed on one side of the mounting box, and an exhaust plate is installed on one side of the inner wall of the mounting box. One side of the air guide cylinder is connected to one side of the exhaust plate through an air guide pipe. A drive component is installed inside the air guide cylinder.

3. The hydraulic control system for the lifting mechanism according to claim 2, characterized in that, The drive assembly includes a circular block located on one side of the air duct. A guide cylinder is symmetrically fixedly connected to one side of the circular block. A guide rod is slidably connected inside the guide cylinder. One end of the guide rod is fixedly connected to one side of the inner wall of the air duct. A flange is provided at one end of the surface of the guide cylinder. A first elastic element is sleeved on the surface of the guide rod and on one side of the flange.

4. The hydraulic control system for the lifting mechanism according to claim 3, characterized in that, A blower is fixedly installed on one side of the mounting box. The output end of the blower is connected to a connecting pipe. One end of the connecting pipe is connected to one end of the air guide tube, and the connecting pipe is on the side away from the circular block.

5. The hydraulic control system for the lifting mechanism according to claim 4, characterized in that, The mounting box has multiple air outlets on one side. A sealing element is installed on one side of the mounting box and outside the air outlets. The sealing element includes multiple sealing strips. Adjacent sealing strips are fixedly connected by connecting blocks. A connecting arm is fixedly connected to one side of the outermost sealing strip.

6. The hydraulic control system for the lifting mechanism according to claim 5, characterized in that, A drive arm is fixedly connected to one side of the circular block. One end of the drive arm passes through the air guide tube and extends to the outside of the air guide tube. One end of the connecting arm is fixedly connected to the drive arm.

7. The hydraulic control system for the lifting mechanism according to claim 2, characterized in that, The exhaust plate includes a plate body with a hollow cavity structure inside. Multiple exhaust holes are arranged in a rectangular array on one side of the plate body, and a blocking mechanism is provided inside the plate body.

8. The hydraulic control system for the lifting mechanism according to claim 7, characterized in that, The blocking mechanism includes multiple sealing blocks, which are fixedly connected by connecting rods and arranged in a rectangular array. A fixing plate is fixedly connected to one side of one of the connecting rods, and a telescopic rod is fixedly connected to one side of the fixing plate. One end of the telescopic rod is fixedly connected to one side of the inner wall of the exhaust plate.

9. The hydraulic control system for the lifting mechanism according to claim 8, characterized in that, A second elastic element is fitted on one side of the fixing plate and on the surface of the telescopic rod.

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