Extra-large flow two-way balance valve

Abstract

The invention relates to an ultra-large flow two-way balance valve. The ultra-large flow two-way balance valve comprises a valve body, a valve element, a first buffering overflow valve and a second buffering overflow valve; one-way valves are integrated in the two ends of the valve element respectively; a first oil port, a second oil port, a third oil port, a fourth oil port, a first oil channel and a second oil channel are formed in the valve body; the left and right of the valve element are opened and closed in a two-way manner, pressure oil from the first oil port or the second oil port is connected or disconnected with the third oil port or the fourth oil port; if a walking motor generates negative load, the valve element automatically adjusts the size of the throttling port, the load is effectively balanced, the micro-motion performance is good, and the through-flow capacity is high. When impact pressure is generated under the working conditions of walking start and stop, uphill and downhill and the like, impact pressure oil from the walking motor flows into the first oil channel or the second oil channel through the third oil port or the fourth oil port, and motor start and stop pressure impact is reduced through the arranged first buffering overflow valve or the second buffering overflow valve; the slope two-way walking speed of the walking mechanism is effectively controlled, and stable operation of the walking mechanism is guaranteed.

Description

technical field [0001] The invention relates to the technical field of balance valves for engineering machinery, in particular to a two-way balance valve with super large flow. Background technique [0002] The balance valve is one of the core hydraulic valve products of construction machinery, which directly affects the controllability and safety of the host product. When the motor-driven traveling mechanism goes downhill, a negative load will be generated due to the action of gravity, and the motor speed exceeds the flow provided by the pump. When the outlet of the pump loses pressure, the set balance valve plays a role to close the throttle of the balance valve spool to limit the speed of walking downhill, and avoid the undesired "slip slope" when going downhill. In fact, the phenomenon of "slipping" may occur in both directions of the traveling mechanism, so balance valves need to be installed in both directions, and cooperate with the traveling motor to make the hydraul...

AI Technical Summary

Problems solved by technology

[0005] (1) Most of the existing two-way balance valves with a plug-in structure are modified on the basis of luffing balance valves or telescopic balance valves used for hydraulic cylinder control. Axial settings are generally used, and the balance valves with large flows are larger in volume , and when used, a relief valve must be installed on the hydraulic motor control oil circuit, the integration degree is low, and there are relatively many pipelines to be connected

[0006] (2) A two-way balance valve that connects the independent modules of the balance reversing valve, overflow valve and check valve is adopted. The overflow valve works under high pressure and large flow, and its opening and closing characteristics are poor. When the motor brakes, it produces a large impact and relatively low stability.

[0007] (3) In the existing balance valve integrated on the hydraulic motor, since the valve body of the balance valve and the rear valve cover of the travel motor are integrated, the internal oil passage structure is complicated, which increases the processing cost; and the overall structural size of the hydraulic motor will also increase. Restricting the flow rate of the balance valve reduces the applicability of the product

[0008] (4) Most of the buffer and overflow valves used in the existing balance valves are threaded plug-in structures. Repeated tightening after maintenance and disassembly will cause deformation of the internal main valve core, pilot valve core and valve sleeve, resulting in performance degradation, opening and closing. Poor characteristics

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