A double multi-stage oil cylinder synchronous lifting hydraulic system

Abstract

The invention relates to a double-multistage-oil-cylinder synchronous lifting hydraulic system which comprises a hydraulic pump, a multi-way valve, a hydraulic lock, a balance valve, a synchronous valve, a one-way sequence valve, a first oil cylinder and a second oil cylinder, wherein the hydraulic pump is connected with the multi-way valve; an oil port A1 of the first page of the multi-way valveis connected with the hydraulic lock, the balance valve and a collecting port of the synchronous valve in sequence through a first pipeline; a flow division port of the synchronous valve is connectedwith a positive cavity of the first oil cylinder through a second pipeline; the other flow division port of the synchronous valve is connected with a positive cavity of the second oil cylinder througha third pipeline; an oil port B1 of the first page of the multi-way valve is connected with the hydraulic lock, the one-way sequence valve and a negative cavity of the second oil cavity in sequence through a fourth pipeline; the negative cavity of the second oil cylinder communicates with a negative cavity of the first oil cylinder; the balance valve is connected with the fourth pipeline througha sixth pipeline; the hydraulic pump is a load sensitive pump; and the multi-way valve is a load sensitive proportional multi-way valve. The double-multistage-oil-cylinder synchronous lifting hydraulic system disclosed by the invention has the advantages of simple structure and high synchronism, and can realize high-precision synchronous lifting of two multistage cylinders and a long-time positionretention function.

Description

technical field [0001] The invention relates to a hydraulic lifting system, in particular to a dual multi-stage oil cylinder synchronous lifting hydraulic system for limited rigid loads. Background technique [0002] The double-cylinder lifting hydraulic system needs to use two oil cylinders to lift the load to the target height. It usually adopts a one-valve, two-cylinder open-loop synchronous hydraulic system or a one-valve, one-cylinder double-circuit closed-loop synchronous hydraulic system. For rigid loads, one-valve, two-cylinder open-loop synchronous hydraulic system or one-valve, one-cylinder, double-circuit closed-loop synchronous hydraulic system can realize synchronous lifting. However, for limited rigid loads or loads that cannot bear large torsional loads, it is difficult for a one-valve, two-cylinder open-loop synchronous hydraulic system to meet the requirements of long-stroke and high-precision operation, and it is easy to cause the torsional load to exceed t...

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Problems solved by technology

[0004] In order to solve the problem that the dual multi-stage cylinder lifting hydraulic system in the prior art has poor synchronization of the two cylinders and easily causes a large torsional load, the present invention provides a dual multi-stage cylinder synchronous lifting hydraulic system, including hydraulic pumps, multiple valve, hydraulic lock, balance valve, synchronous valve, one-way sequence valve, the first oil cylinder and the second oil cylinder, the hydraulic pump is connected with the multi-way valve, and the oil port A1 of the first joint of the multi-way valve passes through the first pipeline It is connected with the hydraulic lock, balance valve and synchronous valve in turn. One branch port of the synchronous valve is connected with the positive chamber of the first oil cylinder through the second pipeline, and the other branch port of the synchronous valve is connected with the first oil cylinder through the third pipeline. The positive cavity of the two oil cylinders is connected, the oil port B1 of the first multi-way valve is connected with the hydraulic lock, the one-way sequence valve and the reverse cavity of the second cylinder in turn through the fourth pipeline, and the reverse cavity of the second cylinder is connected through the fifth pipe The circuit is connected to the reverse chamber of the first oil cylinder, and the balance valve is connected to the fourth circuit between the hydraulic lock and the one-way sequence valve through the sixth circuit; among them, the hydraulic pump is a load-sensing pump, and the multi-way valve is a load-sensing proportional valve. Multi-way valve

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