Novel multi-way valve

Abstract

The invention discloses a novel multi-way valve, which comprises an oil inlet valve block, a lifting valve block, an oblique valve block, an oil return valve block, a plug screw, an O-shaped valve rod, a valve body, a A2-cavity load control valve, a positioning spring, a one-way valve, an oil return channel, a working cavity B, a triangular oil channel, a middle-position oil channel, an annular oil channel, a working cavity A, a hydraulic cylinder rodless cavity and a hydraulic cylinder rod-including cavity. According to the novel multi-way valve, an external load control valve arranged on a valve body is adopted instead of a self-locking valve embedded into a valve rod, and the magnitude of the pressure of the external load control valve can be set according to the load pressure. The most common O-shaped valve rod is adopted instead of an oblique self-locking valve rod which has extremely high requirement on the machining accuracy. The novel multi-way valve has the advantages of high manufacturability, easiness in assembling and convenience in maintaining; moreover, potential safety hazard can be eliminated effectively, and failure rate is reduced; and meanwhile, the requirement on self-locking during forward and backward inclination of a gantry can be met.

Description

technical field [0001] The invention relates to valve equipment, in particular to a novel multi-way valve. Background technique [0002] At present, the domestic forklift multi-way valve mostly adopts a self-locking valve installed in the valve stem to meet the safety requirements of the forklift mast tilting forward and self-locking. This structural form has the following problems: [0003] (1) Since the self-locking valve core is installed in the valve stem, the processing accuracy of the valve stem hole is very high, the process is complex, the processing cycle and cost are 3 to 4 times higher than that of ordinary valve stems, and the product qualification rate is only 60%~ 70%. [0004] (2) When the matching accuracy of the self-locking valve core in the valve stem is not high, the self-locking valve will not open, resulting in the door frame not moving or self-locking failure, and the door frame will automatically tilt forward, which will pose a serious safety hazard...

AI Technical Summary

Problems solved by technology

[0003] (1) Since the self-locking valve core is installed in the valve stem, the processing accuracy of the valve stem hole is very high, the process is complex, the processing cycle and cost are 3 to 4 times higher than that of ordinary valve stems, and the product qualification rate is only 60%~ 70%

[0004] (2) When the matching accuracy of the self-locking valve core in the valve stem is not high, the self-locking valve will not open, resulting in the door frame not moving or self-locking failure, and the door frame will automatically tilt forward, posing serious safety hazards

[0005] (3) When the forklift mast is tilted forward. Since oil needs to be discharged through 5 to 6 staggered small holes (Φ0.8 to Φ1.1) on the valve stem, a high back pressure (up to 40MPa) will be generated in the rod cavity of the tilting hydraulic cylinder of the forklift (the actual The load pressure is only 9~11MPa). Cause the temperature of the hydraulic system to rise, and easily cause damage to the components of the hydraulic system

[0006] (4) The self-locking spool can only be set in the A2 chamber or B2 chamber of the multi-way valve (see figure 1 ), when there are self-locking requirements for both chambers

Such as high mast forklift, it cannot be realized

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