Differential hydraulic cylinder control circuit

Abstract

The invention relates to a control circuit of a differential hydraulic cylinder, which is mainly composed of a differential hydraulic cylinder, a directional control valve and a flow control valve; the left working oil port A of the directional control valve is connected with the first working oil port P and the flow control valve respectively. The rodless chamber of the differential hydraulic cylinder is connected; the right working oil port B of the directional control valve is respectively connected with the second working oil port A of the flow control valve and the rod chamber of the differential hydraulic cylinder. The invention integrates the hydraulic cylinder differential control circuit and the flow regeneration circuit into one body, and has more comprehensive functions. When the hydraulic cylinder is stretched out under pressure, the circuit plays the role of a differential control circuit, which can increase the hydraulic cylinder's extension. Speed, improve its working efficiency; when the hydraulic cylinder is compressed back, this circuit acts as a flow regeneration circuit, reusing the high-pressure hydraulic energy in the rodless cavity of the differential cylinder, so as to achieve the purpose of energy saving and emission reduction.

Description

technical field [0001] The invention belongs to the field of hydraulic cylinder control, and in particular relates to a differential hydraulic cylinder control circuit. Background technique [0002] As a basic hydraulic control circuit, the differential hydraulic cylinder control circuit has been widely used in industrial hydraulics, construction machinery, etc., increasing the hydraulic cylinder extension speed, and at the same time realizing the energy reuse in the rodless cavity when the hydraulic cylinder is retracted. topic of application. There are mainly three types of existing differential hydraulic cylinder control circuits, and their working principles, advantages and disadvantages are as follows: [0003] The first is the commonly used differential hydraulic cylinder control circuit, refer to the attached figure 1 , this circuit can realize the extension and retraction of the hydraulic cylinder, but has no other special functions. There is no special function in...

AI Technical Summary

Problems solved by technology

[0003] The first is the commonly used differential hydraulic cylinder control circuit, refer to the attached figure 1 , this circuit can realize the extension and retraction of the hydraulic cylinder, but has no other special functions. There is no special function in this circuit, and the differential control of the hydraulic cylinder and the regeneration of hydraulic energy in the rodless cavity cannot be realized.

[0004] The second is the common hydraulic cylinder differential control circuit, refer to the attached figure 2 , when the differential hydraulic cylinder works in the first working quadrant, that is, under the condition of pressure extension, the hydraulic oil in the rod chamber in the circuit is connected with the rodless chamber through the external control check valve to realize differential control. Increase the extension speed of the hydraulic cylinder to improve its working efficiency. Although this circuit realizes the differential control of the hydraulic cylinder alone, it cannot realize the system flow regeneration, and cannot regenerate the high-pressure hydraulic energy in the rodless cavity when the hydraulic cylinder is retracted. use

[0005] The third control loop is the differential hydraulic cylinder flow regeneration control loop, refer to the attached image 3 , when the differential hydraulic cylinder works in the second working quadrant, that is, under the compressed working condition, the hydraulic oil in the rodless cavity in the circuit is connected with the rod cavity through the flow regeneration valve, so that part of the rodless cavity returns oil Into the rod cavity, so as to achieve flow regeneration, to achieve the purpose of energy saving and emission reduction, but can not realize the differential control of the hydraulic cylinder, the extension speed of the hydraulic cylinder is slow, and the work efficiency is low

Working in the first and second working quadrants at the same time is the most common working environment for differential hydraulic cylinders, but there is no application circuit that satisfies the two functions of rapid propulsion and energy reuse

Images