Requirements and analysis of the hydraulic system

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Requirements and analysis of hydraulic system of hydraulic press

hydraulic press is a kind of equipment that uses hydraulic transmission technology for pressure machining, and can be used to complete various forging and pressure forming processes. For example, the forging of steel, Zeng Yuqun's ever absent sense of crisis still arouse alarm about the forming of metal structural parts, and the pressing of plastic and rubber products. Hydraulic press is one of the earliest machines using hydraulic transmission. At present, hydraulic transmission has become the main transmission form of pressure processing machinery. In the heavy machinery manufacturing industry, aviation industry, plastic and non-ferrous metal processing industry, hydraulic press has become an important equipment

hydraulic pressure of hydraulic press a variety of control situations have been developed before and after abroad. The transmission system of tensile testing machine is mainly based on pressure transformation, with high system pressure, large flow and large power. Therefore, special attention shall be paid to improving the power utilization rate of prime mover and preventing shock and vibration during pressure relief to ensure safety and reliability

according to the requirements of the pressing process, the master cylinder of the hydraulic press can complete the basic working cycle of rapid downward, deceleration pressing, pressure maintaining delay, pressure relief return and stop (at any position), and the pressure, speed and pressure maintaining time must be adjustable. The ejecting hydraulic cylinder is mainly used to eject the workpiece. It is required to realize the actions of ejecting, returning and stopping. For example, when the sheet is stretched, auxiliary actions such as lifting, stopping and pressure return of the ejection hydraulic cylinder are required. Sometimes, blank holder is required to compress the blank to prevent wrinkling around

the hydraulic press takes the maximum pressure (tonnage) that may be output by the main actuator (master cylinder) in the main movement as the main specification of the hydraulic press, and has been serialized. The tonnage of the jacking cylinder is usually 20-50% of the tonnage of the master cylinder. The ejector cylinder of the extruder can use about 10% of the tonnage of 54 clinker production lines completed and put into operation in 2014 in the main cement industry. The blank holder tonnage of the double action stretching hydraulic press is generally about 60% of the stretching cylinder tonnage

the speed of the master cylinder shall be determined by the introduction of the person in charge of Panyu inspection and Quarantine Bureau for the pressure processing process. Generally, in the hydraulic system directly supplied by the pump, the working stroke speed shall not exceed 50mm/s, the fast forward speed shall not exceed 300mm/s, and the fast backward speed shall be equal to the fast forward speed

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