Core tips: (1) The bypass throttling and speed regulation circuit of the lifting cage platform is composed of a quantitative pump, a safety valve, a hydraulic cylinder and a throttle valve. Oil (1) The bypass throttling speed regulation circuit of the hydraulic lifting cage platform is composed of a quantitative pump, a safety valve, a hydraulic cylinder and a throttle valve. The throttle valve is installed on the side oil circuit where the hydraulic cylinders are connected in parallel, and the throttle valve is used to supply oil to the hydraulic pump. A part of it is discharged back to the fuel tank to realize the speed joint, and the speed regulation principle is shown in Figure 7-14. (1) The characteristics of the bypass throttle speed control circuit. The throttle valve is installed on the branch parallel to the actuator, that is, in parallel with the cylinder. Part of the flow output by the fixed oil pump (q) enters the hydraulic cylinder, and a part (q1 ) Flow back to the tank through the throttle valve. The overflow valve is in j: safety function. When the circuit is working normally, the overflow valve does not open. The valve opens when the oil supply pressure of the lifting cage platform exceeds the normal working pressure to prevent overload. The regulating pressure of the relief valve should be greater than the normal working pressure of the circuit, generally 1.1~1.3 times of the working pressure Plmax required for the maximum load. The hydraulic pump oil supply pressure of the hydraulic construction lift
depends on: (2) The characteristics of the bypass throttling speed control circuit ① There is only throttling loss but no overflow loss; the pressure of the pump changes with the load, and the loop efficiency is high. ②The speed load characteristic is very soft, and the low speed load capacity is poor. It is only suitable for high-speed, heavy-duty and high-power systems that require very low speed stability. mtgx/90.
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