Multi-way valve for tractor hydraulic lifter

Abstract

The invention discloses a multi-way valve for a tractor hydraulic lifter. The multi-way valve for the tractor hydraulic lifter comprises a valve body, wherein an oil inlet cavity, an oil channel A, an oil channel B, an oil outlet cavity A, an oil outlet cavity B, an oil return cavity A, an oil return cavity B and a valve rod are arranged in the valve body, and the valve rod is in hermetic and sliding connection with the valve body; the valve rod is provided with annular grooves corresponding to the oil channel A, the oil channel B, the oil outlet cavity A, the oil outlet cavity B, the oil return cavity A and the oil return cavity B, an operating end of the valve rod is connected with a handle, and a pressurization cavity is further formed in the valve body; when the valve rod slides to the direction of the oil outlet cavity B, the oil channel A communicates with the oil outlet cavity A, and the oil channel B communicates with the pressurization cavity; a hydraulic reset hole is formedin the interior of the valve rod in the axial direction, an inlet end of the hydraulic reset hole communicates with the pressurization cavity, an outlet end of the hydraulic reset hole faces a non-operating end of the valve rod, and a reset device is arranged at the non-operating end of the valve rod. According to the multi-way valve for the tractor hydraulic lifter, automatic reset function is realized in the descending state and the lifting state of an agricultural implement, the valve rod does not need to be manually reset manually, and the operation is convenient.

Description

technical field [0001] The invention belongs to the field of agricultural machinery and relates to a multi-way valve used for a tractor hydraulic lifter. Background technique [0002] The agricultural implements towed behind the tractor are required to be lowered or lifted, and this action is realized by the hydraulic lifter on the tractor. The hydraulic lifter consists of an outer lift arm and an inner lift arm connected together by the lift arm shaft, a piston rod hinged on the inner lift arm, the piston rod is connected to the piston of the hydraulic cylinder, and a multi-way valve is installed on one side of the hydraulic cylinder , the two oil outlets on the multi-way valve are respectively connected to the lifting oil inlet and the lowering oil inlet on the hydraulic cylinder, the oil inlet on the multi-way valve is connected to the hydraulic pump through a pipeline, and the oil return on the multi-way valve The port is connected to the oil storage tank. [0003] The...

AI Technical Summary

Problems solved by technology

[0003] The Chinese patent No. 201210163927.8 records a two-position multi-way valve and a tractor hydraulic lifting system. The non-operating end of the valve stem in the two-position multi-way valve described in the document is equipped with an automatic reset device, but the automatic reset device After the handle is released and the external force is removed, the valve stem will automatically return to the neutral position under the action of the return spring. It is impossible to fix the valve stem in the lifting state when lifting the agricultural implement, or manually fix the valve stem in the lifting state. Need to manually pull the handle to reset the valve stem, the operation is more inconvenient

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