Double-cylinder synchronous hydraulic circuit with functions of supercharging and eliminating accumulated error

Abstract

The invention discloses a double-cylinder synchronous hydraulic circuit with functions of supercharging and eliminating an accumulated error. The hydraulic circuit comprises a left oil cylinder, a right oil cylinder, a left oil line A and a right oil line B, wherein the rod cavities of the left and right oil cylinders are divided into three paths after being connected in parallel; one path is connected with the right oil line B, and the other two paths are respectively connected with the control oil ports of two hydraulic control one-way valves by control oil paths; the rodless cavities of the left and right oil cylinders are respectively connected with upper cavities arranged on the lower and upper parts of a synchronous oil cylinder by the arranged hydraulic control one-way valves; after being connected in parallel, lower cavities on the lower and upper parts of the synchronous oil cylinder are connected with the left oil line A; one side of an arranged three-position four-way solenoid directional valve is respectively connected with the left oil line A and the right oil line B; the other side of the arranged three-position four-way solenoid directional valve is respectively connected with the middle cavity and lower cavity of an arranged pressure cylinder; after an oil return check valve is connected between the middle cavity and upper cavity of the pressure cylinder, the middle cavity and upper cavity are connected with the rodless cavity of the right oil cylinder and the oil lines of the hydraulic control one-way valves; a connecting oil line for the rodless cavities of the left and right oil cylinders is connected with a high-pressure electromagnetic ball valve; and a connecting oil line for the high-pressure electromagnetic ball valve and an oil discharging check valve is connected with a pressure transmitter. The double-cylinder synchronous hydraulic circuit has the advantages of good flexibility, high synchronization accuracy and wide application range.

Description

technical field [0001] The invention relates to a double-cylinder synchronous hydraulic circuit, in particular to a double-cylinder synchronous hydraulic circuit with the functions of increasing pressure and eliminating accumulated errors. Background technique [0002] In the hydraulic system, the circuit that keeps the relative position or speed of two or more hydraulic cylinders in motion is called a synchronous circuit. At present, there are more industrial applications of double-cylinder synchronous hydraulic circuits. From the classification of connection methods, it can be divided into two-cylinder series synchronous hydraulic circuits and double-cylinder parallel synchronous hydraulic circuits. The common synchronous hydraulic circuit of two cylinders in series is mainly composed of two hydraulic cylinders in series, which has the advantage of high degree of synchronization of the two cylinders, such as figure 1 As shown, the common series synchronous hydraulic c...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a dual-cylinder synchronous hydraulic circuit with the functions of boosting and eliminating cumulative errors, especially to solve the large and uncertain load difference between the two cylinders existing in the existing dual-cylinder parallel synchronous hydraulic circuit. The disadvantage of poor synchronization accuracy of the two oil cylinders, through the advantages of the double-cylinder series synchronous hydraulic circuit and the double-cylinder parallel synchronous hydraulic circuit integrated by the present invention, can also increase the pressure of the two hydraulic cylinders and eliminate the cumulative error, and the synchronization degree is high and bears Strong synchronization ability, good flexibility and wide application range when the load changes

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