High performance and energy-saving double-acting hydrostatic press driven by servo motor

Abstract

The invention relates to a high performance and energy-saving double-acting hydrostatic press driven by a servo motor. The invention retains the rapid liquid-filling and direction control circuits in the common hydrostatic press, but uses a controllable hydraulic source composed of an AC servo motor and a quantitative oil pump to replace an uncontrollable hydraulic source driven by a common induction motor and combine with various sensors, and realizes the energy-saving pressure, position and speed control of the system under the control and regulation of the electrical motor; displacement sensors are added in a main cylinder and an auxiliary cylinder, a pressure sensor is added in the oil inlet line of the main cylinder, thus realizing the closed-loop control of position, speed and pressure; and a proportional relief valve is added at the oil outlet of the auxiliary cylinder, thus realizing variable blank holder force floating blank-holding of the auxiliary cylinder, wherein the electrical motor is the high-power AC servo motor, the electrical motor is connected with a controller, and the flow control and the volume velocity-governing and pressure-regulating of the main oil line can be realized by controlling the speed of the electrical motor. The invention completely uses the advantages of the high-power AC servo motor such as high efficiency, controllable performance, adjustable performance and good reliability to realize the optimization of process parameters, improve the hydrostatic press performance and reduce the energy consumption.

Description

technical field [0001] The invention relates to a high-performance hydraulic press in the field of forming equipment, in particular to a high-performance, energy-saving double-acting hydraulic press driven by a servo motor, which belongs to the innovative technology of hydraulic presses. Background technique [0002] The hydraulic press is an important forming equipment. The motor drives the hydraulic pump to generate high-pressure liquid, and the hydraulic cylinder generates linear motion to work. Due to the wide adaptability of hydraulic machining, it is widely used in metal and non-metal forming processing. The driving motor of a conventional hydraulic press generally does not adjust its speed, and the control of the position, speed, direction, and pressure of the hydraulic press is realized by the control of hydraulic components. For the existing high-performance hydraulic machines, there are the following problems: 1) the control system is complex, which increases the ...

AI Technical Summary

Problems solved by technology

For the existing high-performance hydraulic machines, there are the following problems: 1) the control system is complex, which increases the cost and failure rate; 2) if the speed control is throttled, the energy loss is serious and the transmission efficiency is low

3) If the speed control adopts volume speed regulation, although the efficiency can be improved, the control range is small, and the structure of the hydraulic components (variable pump, etc.) is complicated, the cost is high, and the failure rate is high; 4) The pressure control adopts the overflow method, which consumes a lot of energy

5) The motor still works when it is in standby mode, and the method of pump discharge is adopted. Due to the existence of discharge pressure, it also brings a lot of energy loss

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