Hydraulic reversing valve with axially moving and rotating functions

Abstract

The invention belongs to a hydraulic reversing valve with axially moving and rotating functions. The hydraulic reversing valve comprises a valve body, a combined valve core a valve sleeve, an end cover and a sealing piece, wherein the valve body is provided with an oil inlet, an oil return port, two working oil ports and a corresponding ring groove; the two ends of the combined valve core are provided with a rotating power valve rod and a moving power valve rod respectively; four Z-shaped oil cavities and Z-shaped cylindrical surfaces are formed symmetrically on the cylindrical surface of the valve core body; and the valve sleeve is provided with four groups of connecting oil circuits which are formed at equal angular intervals and each of which consists of two symmetrically-formed oil channels. When the hydraulic reversing valve is in a normal state, the valve core works in a linear moving way, and a working oil port on the valve sleeve forms opening and closing relations with the Z-shaped oil cavities and Z-shaped cylindrical surfaces; and when the linear movement of the valve core is interfered, the valve core can be switched to a rotating working state, so that the normal switching function of the reversing valve can be realized. The hydraulic reversing valve has the characteristics of effective improvements on the working safety, continuity and reliability of the reversing valve and a hydraulic system thereof, particular important role in the field with high requirement on the working continuity, and the like.

Description

technical field [0001] The invention relates to an industrial hydraulic control component, in particular to a dual-function hydraulic reversing valve capable of moving (sliding) along the axial direction and rotating around the axis; When the sliding fault causes the spool to not move smoothly in a straight line, the spool switches to the rotary motion working mode, so that the reversing valve can still maintain the switching function of the normal hydraulic oil circuit and ensure its normal operation. Background technique [0002] The hydraulic reversing valve uses the relative movement of the spool to the valve body to make the oil circuit on, off (cut off) or change the direction of the oil flow, so as to realize the start, stop or change of the movement direction of the hydraulic actuator and its driving mechanism. valve. According to the movement mode of the spool relative to the valve body, the hydraulic directional valve can be divided into slide valve and rotary val...

AI Technical Summary

Problems solved by technology

[0004] 1. The structure is complex, the processing precision is high, and the manufacturing cost is high;

[0005] 2. It is easy to generate extra mechanical force during use, which makes the valve core deviate from the center position of the valve hole, and then generates corresponding hydraulic clamping force, which may still cause inflexible movement;

[0006] 3. After the spool is worn, it is easy to make the spool deviate from the coaxial, resulting in inflexible movement;

[0007] 4. If the hydraulic oil is not clean, impurities in the oil may also cause inflexible movement;

[0008] 5. Once a movement inflexibility fault occurs, the reversing valve itself cannot recover from the fault to the normal working state

[0009] In the patent document with the publication number CN101832306A, a "rack and pinion type three-position four-way hydraulic rotary valve" is disclosed. The disadvantages of pulling and pushing in a straight line at an angle, while solving the problem of strict requirements on oil purification, high manufacturing cost and high failure rate of the slide-pull reversing valve, but the hydraulic valve still has the following shortcomings:

[0010] 1. The tight fit between the valve body and the distribution valve requires high manufacturing requirements and increases the cost;

[0011] 2. Due to the gap between the gear and the rack, it will affect the control accuracy of the rotary valve spool;

[0012] 3. The positioning accuracy of the circlip to the distribution valve will have a great influence on the performance of the entire reversing valve;

[0013] 4. Due to the structural asymmetry of the distribution valve, there must be an unbalanced radial force, which is prone to the problem of inflexible movement and cannot automatically return to the normal state

[0014] The above multi-position and multi-way reversing valves either adopt a separate spool valve structure or a separate rotary valve structure, so there is a problem that if they encounter a fault in the working state during their work, such as motion failure When it is flexible, the hydraulic system cannot work normally, especially in some fields that require high continuity of work, such failures have a great impact on work and other defects

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