Introduction of all-terrain crane pump hydraulic

Large tonnage all-terrain crane pump control hydraulic system I. Introduction Crane prior art hydraulic system and more for the valve control, that is, by controlling the size of the hydraulic multi-way valve opening to control the hydraulic system flow to control the actuator speed size. This structure of energy loss, the system heat. The system uses pump-controlled hydraulic system to ensure the coordination of the engine and hydraulic system, the effective use of the engine power, to avoid unnecessary energy consumption, saving energy, to achieve the work of the institutions stepless regulation. The system has excellent fretting, greatly reducing the impact of the hydraulic system, helping to protect the hydraulic system and hydraulic components, extending the service life of the hydraulic components and greatly improving the operation safety, reliability and work efficiency of the crane. The system uses the electronic control of the way, the real machine, electricity, liquid integration and crane operations intelligence. System with retractable mechanism and electrical system telescopic single-cylinder latch function. Second, an overview of the system through the electro-hydraulic proportional pilot-controlled displacement of the actuator to achieve the implementation of the movement speed changes. The system consists of a closed loop of the rotary circuit, open circuit of the main oil and auxiliary oil circuit composition. Swing oil circuit using swash plate variable displacement piston pump and closed-loop quantitative motor circuit. The pump's oil outlet is connected to the motor's oil inlet, the motor's oil outlet is connected to the pump's oil inlet to form a closed circuit, and no valve is needed. The pump is changed by adjusting the angle of the variable pump Of the flow and pressure oil direction, thereby changing the rotary motor speed and direction of rotation. Therefore, good mobility and stable rotation. Variable displacement piston pump with a charge pump and charge device, which can effectively improve the pump speed and prevent pump suction empty. The main oil routes include main and auxiliary lifting oil routes, luffing oil routes and telescopic oil routes. The main pump adopts inclined axis variable double pump, and independent variable control can meet the speed regulation requirements of various agencies under different working conditions of the crane. One of the constant power hyperbola not only depends on the pump's own set point but also on the other pump's load conditions. With power regulators and limit load regulation, the power regulator regulates the displacement of the pump associated with the working pressure and must not exceed the given drive power. Once overloaded, the control pressure output by the proportional pressure relief valve will swing back the dual pump, reducing flow and increasing pump absorption of engine power. Constant power pump override the pilot pressure control, therefore, the variable pump control curve shown in Figure. The entire system for the pump speed control system, the use of advanced electro-hydraulic proportional pilot control technology, that is, the displacement of the pump is controlled by the pilot oil, the displacement of the size of the pressure by the pilot oil, and the pressure is proportional to the supply. The size of the pilot oil pressure is controlled by a proportional pressure relief valve, the proportional pressure relief valve according to the size of the solenoid current proportional to change the output pressure. The greater the displacement of the electronic remote control pilot handle, the greater the output current, the pressure of the proportional pressure reducing valve will also increase correspondingly. As a result, the displacement of the pump will increase and the actuator will move faster. On the contrary, the electronic remote control pilot The smaller the handle displacement, the slower the actuator will move. On the one hand, the operator controls the direction of movement of each actuator (luffing cylinder, telescopic oil cylinder, main and auxiliary lifting motors) through the main valve commutation; on the other hand, by changing the moving direction and displacement of the pilot handle, Pump displacement to control the actuator speed. Control of pressure can make double pump displacement stepless change, the greater the control pressure, the greater the flow, the faster the movement speed. Dual pumps can supply oil to each actuator independently, and can also be supplied to actuators after merging. The range of speed regulation is large and the stepless speed regulation can be realized with excellent fretting. Third, the functional introduction 1, large-tonnage rotary oil crane construction crane slewing mechanism for the whole machine control performance, operating efficiency, system efficiency and structure of the force is essential, so in addition to using on-demand pump control circuit, quantitative motor-driven In order to ensure the slewing speed control performance and stability of the operation, the body's cushioning performance and start-up performance also gave a comprehensive consideration. Slewing process can be smoothly controlled, so that equipment safety can be effectively guaranteed. Rotary oil circuit is a closed loop, no valve, adjust the angle of the variable pump swashplate to change the flow of the pump and the direction of the pressure oil control rotary motor speed and direction of rotation. The pump has a charge pump and charge device, which can effectively increase the pump speed and prevent pump suction; with filters and luminous pollution indicators. Swivel buffer valve is set for its smooth performance. Set the free-wheeling solenoid valve, its role is: During the lifting of heavy objects, especially when heavy objects will leave the ground, the boom will be subject to lateral pull, in order to prevent the boom from breaking, then press the free-wheeling Control switch so that the swing brake control solenoid valve and the free-slip solenoid valve at the same time there will be electricity, the swing motor two work port oil communication, while the rotary brake is also opened, so that the entire part of the float in the state, boom in the Wire rope pull automatically placed under the weight center of gravity, thus protecting the boom. Therefore, the rotary system has the following advantages: A, smooth start and stop control features, through the electrical proportional control of the control characteristics of the slewing mechanism start smoothly, slow pause, to ensure the stability of rotary operations, to avoid the impact. B, a good pump speed control system, a wide speed curve, the speed of rotation from the engine speed and A4VG pump displacement product of the decision, at any stable engine speed or any pump swing angle can get a good flow control curve . C, three-speed speed curve adjustment system control, the slewing speed can be three curves to choose control, the maximum swing angle of the pump can be the maximum limit of 33%, 66%, 100% swing pump swing angle control, so much Improve the operator's control accuracy. 2, the main and auxiliary lifting oil main and auxiliary lifting agencies using built-in quantitative motor, small size, torsion big rejection. Its internal safety valve installed to protect the motor, which can effectively prevent the motor damage due to overload. Refer to figure l and its serial number for lifting (vice lifting is optional) Hydraulic system Description: The main and auxiliary winch brake 6,9 ​​are normally closed, when the control of the main and auxiliary lifting pilot handle , The control oil from the auxiliary pump 3 causes the main directional control valve 13 to be firstly commutated and at the same time the pressure oil output by the proportional pressure reducing valve 4 swings the main pump 2 to a certain angle and the main oil pressure is passed The shuttle valves in the lifting balance valves 8, 11 are depressurized by the pressure reducing valve, and then the hoisting brakes 6, 9 are turned on to perform a normal lifting or lowering operation. When the pilot handle returns to neutral position, the pilot oil to the main valve 13 is closed and the main valve 13 is also returned to the neutral position. The main circuit pressure oil is returned from the main valve 13 to the tank 1 in the unloading state, so that the winch brake 6, 9 under the action of the brake spring through the oil drain back to the tank 1, so the brake 6, 9 under the action of the spring in a braking state. The lifting balance valves 8 and 11 in the main and auxiliary lifting oil lines can effectively prevent the stalling phenomenon of the heavy objects during the decentralization process and ensure the steady and reliable lowering speed of heavy objects so as to improve the safety performance. Lord, vice lifting mechanism built-in quantitative motor 7,10, small size, torsion big rejection. Its internal safety valve installed to protect the motor 7,10, can effectively prevent the motor damage due to overload. Vice lifting through the quick connector 12 for optional switching. 3, the luffing oil amplitude of the maximum swing angle of the pump can be the maximum limit of 33%, 66%, 100% of the hydraulic pump maximum swing angle control, amplitude drop using advanced gravity reduction principle, luffing balance valve Of the drop with the pilot handle directly control the proportional pressure reducing valve, the pilot handle to control the luffing cylinder descent speed, when the luffing cylinder due to arm length or lifting causes luffing cylinder force increased to the set value, the amplitude Counterbalance valve will be pressure compensation control, with the increase of the luffing cylinder to automatically slow down the speed to ensure the stability of the boom when the luffing drop jobs. 4, telescopic oil This machine has a total of five main boom, using single cylinder plus latch expansion principle, driven by a telescopic cylinder four telescopic boom, telescopic sequence can be manually controlled or pre-set way for automatic control. When the boom is extended, with the movement of the pilot handle, the cylinder pin will pin the cylinder with the selected boom and the arm pin will be pulled out. The opening of the multi-way reversing valve will increase gradually, and the pressure oil will enter Telescopic cylinder rodless chamber, pushing the telescopic cylinder cylinder to drive the boom forward, the arm extended in place by the arm pin locked. When the boom is retracted, the cylinder pin will pin the cylinder with the selected boom as the pilot handle is moved. 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