Multifunctional valve used for controlling seedling table of rice transplanter to rise and fall

Abstract

The invention belongs to the technical field of rice transplanters, and particularly relates to a multifunctional valve used for controlling a seedling table of a rice transplanter to rise and fall. The multifunctional valve used for controlling the seedling table of the rice transplanter to rise and fall comprises a reversing valve, a shuttle valve, a hydraulic-control one-way valve, a stop valve, a one-way throttling valve and a lifting oil cylinder, wherein the reversing valve, the shuttle valve, the hydraulic-control one-way valve, the stop valve, the one-way throttling valve and the lifting oil cylinder are connected in sequence. The reversing valve is a five-position and four-way reversing valve. A first oil outlet of the reversing valve communicates with a first oil port of the shuttle valve and a main oil path of the hydraulic-control one-way valve. A second oil outlet of the reversing valve communicates with a second oil port of the shuttle valve and an auxiliary oil port of the hydraulic-control one-way valve. An unloading valve is connected to an oil outlet of the shuttle valve. A throttling pressure-relief hole communicating with the auxiliary oil port of the hydraulic-control one-way valve is formed in the hydraulic-control one-way valve and is connected with an oil tank. The reversing valve has a rising position, a throttling rising position, a middle position, athrottling falling position and a falling position. An oil outlet of the one-way throttling valve communicates with a cavity of the lifting oil cylinder, and the other cavity of the lifting oil cylinder communicates with the oil tank. The reversing motion of the reversing valve controls the lifting oil cylinder to rise and fall.

Description

technical field [0001] The invention belongs to the technical field of rice transplanters, and in particular relates to a multifunctional valve for controlling the lifting of a seedling platform of a rice transplanter. Background technique [0002] In order to promote the modernization and localization of high-level agricultural machinery, the rice transplanter is a high-tech product of agricultural machinery for large-scale rice cultivation. Rice transplanters are classified into high-speed rice transplanters and hand-held rice transplanters. High-speed rice transplanters are used for large areas, high transplanting efficiency, and are not restricted by field plots. Block restrictions, such as deep and shallow terrain in Northeast China, only high-speed rice transplanters can be used, and high-speed rice transplanters and hand-held rice transplanters can be used in shallow places, and high-speed rice transplanters are more favored by users. The existing valve for controlli...

AI Technical Summary

Problems solved by technology

The existing valves that control the lifting of the seedling platform of high-speed rice transplanters have relatively single functions. For example, the patent number is 201620440681.8, and the patent document titled "Hydraulic Cylinder Position Control System for Lifting Mechanism of Seedling Box of High-speed Rice Transplanter" discloses that "the hydraulic transmission The system includes a hydraulic pump, a three-position four-way servo directional valve, a hydraulic cylinder, and a safety valve; the hydraulic pump, a three-position four-way servo directional valve, and a hydraulic cylinder are connected in sequence; Control the action of the three-position four-way servo reversing valve and adjust the position of the hydraulic cylinder", and refer to the attached specification of the patent document figure 1

[0003] The above-mentioned prior art has the following defects: ① The lifting speed of the hydraulic cylinder is constant, and the lifting speed of the hydraulic cylinder cannot be linearly regulated, so it cannot meet various seedling transplanting environments, and its adaptability is weak; Shorten the service life of the rice transplanter; ③The control system only has the overload protection of the safety valve, and the safety performance is poor

The existing valve for controlling the lifting of the seedling table of the rice transplanter cannot meet the high-quality and high-efficiency pursuit of the high-speed rice transplanter. According to the development needs of the high-speed rice transplanter, in order to broaden the product categories and meet the requirements of the company's internal development, it is necessary to design a valve. A kind of multi-functional valve for controlling the lifting of seedling platform of rice transplanter

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