Rotatary brake valve

Abstract

A rotary brake valve, characterized in that motor ports MA and MB connected to the motor, external oil ports VA, VB and oil return port T are formed on the valve body, from oil port VA to motor port MA and oil return port T The second one-way valve (2) is connected to the forward direction and the first one-way valve (1) is connected to the reverse direction respectively, and the first one with the first pilot valve (3) is connected between the motor port MA and the oil return port T. Relief valve (4), the small hole in the spring chamber (N3) of the first pilot valve communicates with the small hole on the oil port VB; from the oil port VB to the motor port MB and the oil return port T, respectively, the fourth The one-way valve (8) and the third one-way valve (7) are connected in the reverse direction, and the second relief valve (10) with the second pilot valve (9) is connected between the motor port MB and the oil return port T. The small hole (N4) of the spring chamber of the second pilot valve is connected with the small hole on the oil port VA, which has a compact structure and good rotation stability.

Description

technical field [0001] The invention relates to a rotary brake valve. Background technique [0002] The slewing brake valve is a commonly used valve in hydraulic technology, and is widely used in the control of the slewing action of engineering machinery vehicles such as truck cranes and crawler cranes. For example, the Chinese patent application number CN90216151. "Hydraulic excavator slewing system that recovers braking energy", the system is equipped with a slewing oil motor that drives the slewing table, a hydraulic reversing valve that controls the rotation direction of the slewing oil motor, and a slewing oil pump and prime mover that provide power to the system. It is characterized in that it is also equipped with a recovery and regeneration circuit for the braking energy of the turntable, the accumulator is connected in parallel with the rotary oil motor, and a hydraulic control check valve is connected in series between the accumulator and the oil pipeline of the ro...

AI Technical Summary

Problems solved by technology

It is characterized in that it is also equipped with a recovery and regeneration circuit for the braking energy of the turntable, the accumulator is connected in parallel with the rotary oil motor, and a hydraulic control check valve is connected in series between the accumulator and the oil pipeline of the rotary oil motor, and the accumulator A hydraulic control check valve is connected in series with the oil pipeline of the rotary oil motor, the control oil circuit of the hydraulic control check valve is connected in parallel with the control oil circuit of the hydraulic reversing valve, and the control oil circuit of the hydraulic control check valve is connected with the hydraulic reversing valve. The control oil circuit of the valve is connected in parallel, and the unloading valve is connected in parallel with the two oil pipelines of the hydraulic reversing valve. A hydraulically controlled one-way valve is connected in series, and a hydraulically controlled one-way valve is connected in series between the oil delivery pipeline of the hydraulic reversing valve and the oil delivery pipeline of the rotary oil motor. When the turntable is started, the energy recovered by the release of the accumulator is initially driven independently and the oil pump is unloaded. When the pressure of the accumulator drops below the set pressure of the unloading valve, the oil pump and the accumulator Driven together, the test proves that the system can save energy by 30%, but its disadvantages are: the volume is relatively large, and the stability of the rotation needs to be further improved

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