Manual control valve of harvester

Abstract

The invention provides a manual control valve of a harvester and belongs to the technical field of hydraulic pressure. The manual control valve of the harvester solves the problem that an existing manual control valve of a harvester is poor in control stability and control accuracy degree. The manual control valve of the harvester comprises a valve body; a first reserving control valve and a second reserving control valve are connected with an oil inlet and an oil returning port in a series-parallel connection manner; a first control oil way of the first reserving control valve can be communicated with a first control oil port in the valve body; fixing throttling holes are formed in the first control oil way; a communicating oil way is further arranged on the first reserving control valve; the second reserving control valve is provided with an oil supplying oil way and an oil inflow oil way which is provided with throttling small holes; a second control oil way and a third control oil way of the second reserving control valve can be communicated with a second control oil port and a third control oil port in the valve body correspondingly; the second reserving control valve is further provided with a turning-connection oil way communicated with a turning-connection oil port in the valve body; and the oil supplying oil way and the turning-connection oil way are connected through a flow pressure control valve. The manual control valve of the harvester improves the control precision and the control stability.

Description

technical field [0001] The invention belongs to the technical field of hydraulic pressure and relates to a harvester manual control valve. Background technique [0002] The harvester is an integrated machine for harvesting crops. It completes harvesting and threshing at one time, and gathers the grains into the storage bin, and then transports the grains to the transport vehicle through the conveyor belt. For example, the current rice harvester has five main actions: reel lifting, barrel lifting, barrel rotation, header lifting and left and right steering. The hydraulic system of the rice harvester can be configured as an integrated valve for reel lifting, cannon barrel lifting and rotating, and an integrated valve for header lifting and left and right steering. [0003] An integrated valve for header lifting and left and right steering, for example, an agricultural machinery header steering valve developed and applied for by the applicant [Application No. 201520287810.X; A...

AI Technical Summary

Problems solved by technology

However, the problem with the structure of the above-mentioned control valve is that there are many oil passages in the valve body, resulting in a large pressure loss, insufficient supply of hydraulic oil or large pressure changes, resulting in unstable oil pressure of the control oil, affecting the stability and stability of the control. Accuracy

Moreover, the existing hydraulic reversing valve structure has a short speed regulating area, which is prone to high-pressure shocks. After the valve stem returns to the neutral position, the hydraulic lock returns to the position for a long time, which is not conducive to the locking of the actuator.

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