Servo drive belt variable pump low-speed control hydraulic circuit

Abstract

The invention discloses a servo drive belt variable pump low-speed control hydraulic circuit. A circuit oil filter F2 is connected with a system oil outlet T and a system safety valve V1, a system oil inlet P is connected with the system safety valve V1, a variable plunger pump P2 and a control oil return-prevention one-way valve V2, the variable plunger pump P2 is connected with a servo motor MTR, an oil absorption oil filter F1 and an oil pump oscillating angle control valve V4, and the control oil return-prevention one-way valve V2 is connected with a pressure gage B1, the oil pump oscillating angle control valve V4, an energy accumulator F3 and a pressure release valve V3. The oil pump displacement is variable and adjustable, and the magnitude of the oscillating angle of an oil pump can be adjusted according to different requirements so that different working condition requirements, particularly occasions with a low speed requirement can be met; and the displacement output is reduced through reduction of the oscillating angle of the oil pump, the flow requirement of a system is met in the manner of increasing the rotation speed, rotation speed setting of servo power is based on the limiting value of the rotation speed, and the two parameters are matched within the stably-controlled range.

Description

technical field [0001] The invention relates to a hydraulic circuit, in particular to a low-speed control hydraulic circuit with a servo-driven variable pump. Background technique [0002] Modern injection molding machines commonly use hydraulic circuits with servo power and gear pump (quantitative) mode, such as figure 1 As shown, the oil inlet P of the system, the quantitative gear pump P1 and the oil suction filter F1 are connected in sequence, the quantitative gear pump P1 is connected with the servo motor MTR, and the circuit oil filter F2 is connected with the oil outlet T of the system and the safety valve V1 of the system. The system safety valve V1 is connected with the system oil inlet P and the quantitative gear pump P1. It is characterized by simplicity and reliability, and can meet most production needs. However, it has its shortcomings for the special needs of special industries. For occasions that require low-speed performance and high performance, because th...

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Problems solved by technology

It is characterized by simplicity and reliability, and can meet most production needs. However, it has its shortcomings for the special needs of special industries. For occasions that require low-speed performance and high performance, because the displacement of fixed-quantity gear pump P1 is fixed, only its speed can be controlled. To reduce the flow output, and the servo motor MTR has a limit for the stability of the minimum speed output, below this value, its stability will be uncontrollable, thus affecting the stability of the system

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