Multi-way valve for tractor and integrated with auto-skip distributor function

Abstract

The invention discloses a multi-way valve for a tractor and integrated with an auto-skip distributor function. The multi-way valve comprises an oil inlet body, and the oil inlet body is provided withan oil inlet P and an oil returning opening T. A plurality of working valve plates are connected in parallel on the oil inlet body in sequence, and the outermost working valve plate is connected witha distribution control valve. The distribution control valve includes a valve body, and a valve rod is installed in the valve body. A skip adjustment device is installed in the inner cavity of the valve rod, and a set screw for blocking the inner cavity of the valve rod is installed at the end of the valve rod. A valve rod positioning device is installed between the valve rod located between the set screw and the skip adjustment device, and a valve rod reset device is installed between the set screw and the valve rod positioning device. The multi-way valve is compact in structure, lightens theweight, saves pipelines between the multi-way valve and a distributor, and is convenient to install, arrange and maintain; and the skip adjustment device eliminates the problem of unequal return oilback pressure acting areas on a valve rod assembly system, so that the valve rod has automatic skip of secondary pressure in the strong-lifting position, and simplicity and reliability are achieved.

Description

Technical field [0001] The invention relates to a multi-way valve, in particular to a multi-way valve used on a tractor. Background technique [0002] The control elements of the current tractor hydraulic system are composed of Picture 10 The hydraulic multi-way valve C port and Picture 11 The P port of the distributor is combined in series. The control system composed of multi-way valve and distributor is large in size, complicated in installation and arrangement, and inconvenient for maintenance. At present, the strong reduction speed of the tractor hoist is controlled by the operator Picture 11 The joystick angle of the distributor shown is achieved by matching the engine speed. Since the distributors of each manufacturer are different, the skill requirements of the operator are extremely high. Picture 11 The valve stem assembly system composed of the valve stem of the distributor shown and its reset device extends into the left end cover, the valve stem and the valve body...

AI Technical Summary

Problems solved by technology

In the cavity of the left end cover, the area acting on the left side of the valve stem assembly system is larger than the area of ​​the right valve stem assembly system. If there is back pressure in the return oil, it will generate a rightward thrust on the valve stem, causing the valve stem to Move to the right to make the valve stem change direction automatically, the controllability is poor, the safety is poor, and accidents are prone to occur

[0003] Figure 12 The shown distributor adds a balance guide rod to the valve stem assembly system to eliminate the influence of back pressure, but its internal structure is too complicated, the parts are difficult to process, and the reliability is not high

At present, none of the distributors on the market have a one-way valve, and there is a nodding phenomenon when the force is lifted, which poses a safety hazard

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