Dual-purpose multi-channel hydraulic proportional valve

Abstract

The invention relates to a dual-purpose multi-channel hydraulic proportional valve which comprises a pump connecting module. The second main oil channel of the pump connecting module is communicated with the oil inlet of the pump connecting module, a hole in the valve rod of a three-way overflow valve and an oil channel in the valve rod in sequence, one channel is connected to a first throttling hole and a valve rod spring cavity, and the other channel is connected to the left end of the valve rod of the three-way overflow valve. A first loading pressure feedback oil way channel is connected into an LS oil inlet of the pump connecting module, a small hole, a second throttling hole, an oil hole and the valve rod spring cavity in sequence through pressure oil fed back by an execution module, and the second throttling hole is communicated with the oil channel between the small hole and a third throttling valve and the oil channel between the first throttling hole and the valve rod spring cavity. According to a control pressure oil channel, pump outlet pressure oil passes through a small oil mouth and a P oil mouth pressure collecting point from the oil inlet of the pump connecting module to enter a pressure reducing valve, and the other end of the pressure reducing valve is connected with the execution module through the oil hole. The dual-purpose multi-channel hydraulic proportional valve is suitable for variable pumps and metering pumps, and only supplies necessary flow for maintaining system working under the working pressure needed by loads.

Description

technical field [0001] The invention belongs to the technical field of hydraulic machine cooling systems, in particular to a dual-purpose multi-channel hydraulic proportional valve. Background technique [0002] There are roughly several forms of hydraulic system induction: [0003] 1. Constant pressure system [0004] The constant flow is provided by the quantitative pump, and the system pressure is determined by the load acting on the working medium. The system is limited by a high-pressure relief valve to limit the maximum pressure. When the system working pressure reaches the set value, almost all the flow of the hydraulic pump will pass through The overflow valve returns to the oil tank, resulting in large power loss, high heat generation, and low system efficiency. [0005] 2. Constant flow system [0006] The system is supplied by a quantitative pump, matched with a proportional valve with a three-way relief valve. The position of the spool of the three-way relief ...

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Problems solved by technology

[0022] In addition, screw holes are processed on the front cover body and the rear cover spring cover, and the front cover adjustment screw and the rear cover adjustment screw directly withstand the two ends of the reversing valve. There are two defects in this structure: one is that the rear spring cover It is inconvenient to adjust the adjustment screw on the top, and oil leakage occurs during adjustment. The second is that the adjustment screw is easy to break and cause oil leakage.

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