Energy-saving method of hydraulic pump station for press

Abstract

The invention discloses an energy-saving method of a hydraulic pump station for a press. The method comprises the following steps that an external hydraulic circuit of a hydraulic motor is sequentially connected with a throttle valve, an electrical one-way valve and an accumulator; a hydraulic pump part is provided with a double-pump and double-speed circuit, when an execution element quickly feeds in work, a large quantity of hydraulic fluid is supplied by the double pumps at low pressure, and when the execution element slowly feeds in work, a small quantity of hydraulic fluid is supplied by single pump at high pressure, the large pump is unloaded, then the system has no overflow loss, and the inside of the double-pump and double-speed circuit is provided with an electromagnetic valve for switching the working states; the hydraulic fluid is filled into the accumulator of the hydraulic pump station which normally runs, the electrical one-way valve is controlled to be energized and opened, and the hydraulic fluid in the accumulator flows into the hydraulic motor through the preset throttle valve; and when the pressure drops to the lower limiting setting value of a pressure gauge, the normal working state is started. The energy-saving method has the advantages that the hydraulic energy in the accumulator can be released into the hydraulic motor, and then an electric motor can quickly run; and the working efficiency of the integral equipment is improved, and the electric energy is saved.

Description

technical field [0001] The invention relates to the field of hydraulic technology, in particular to an energy-saving method for a hydraulic pump station used in a press. Background technique [0002] The hydraulic system has the advantages of large power, good adjustability of working pressure and flow, heat can be brought back to the oil tank, etc. However, there are multiple energy conversions in hydraulic transmission, and the hydraulic oil tank causes potential environmental pollution and oil loss. Therefore, hydraulic technology must improve the performance of hydraulic transmission and control in order to meet the needs of sustainable development and energy saving. Mechanical transmission competitiveness. Although the unloading of the relief valve in the hydraulic system of the press can reduce the load of the motor, it still consumes more than 1 / 3 of the electric energy of the full load. Although the motor does not consume electric energy, it will consume a lot when ...

AI Technical Summary

Problems solved by technology

However, there are multiple energy conversions in hydraulic transmission, and the hydraulic oil tank causes potential environmental pollution and oil loss. Therefore, hydraulic technology must improve the performance of hydraulic transmission and control in order to meet the needs of sustainable development and energy saving. Mechanical transmission competitiveness

Although the unloading of the relief valve in the hydraulic system of the press can reduce the load of the motor, it still consumes more than 1 / 3 of the electric energy of the full load. Although the motor does not consume electric energy, it will consume a lot when the motor starts again. If there are too many starts, the waste will be very large, and the continuous impact of high current on the power grid will cause the voltage of the power grid to drop instantly, which will affect the safety and life of other electrical appliances, and increase the cost of equipment.