Single-pump and single-motor closed type hydraulic system for travelling mechanism of land leveler

Abstract

The invention discloses a single-pump and single-motor closed type hydraulic system for a travelling mechanism of a land leveler. The single-pump and single-motor closed type hydraulic system comprises a hydraulic pump and a hydraulic motor. An outlet A of the hydraulic pump is communicated with an inlet C of the hydraulic motor, and an outlet B of the hydraulic pump is communicated with an inlet D of the hydraulic motor. A first one-way relief valve and a second one-way relief valve which are oppositely arranged are connected between the outlet A and the outlet B of the hydraulic pump in parallel. The outlet A of the hydraulic pump is communicated with a port P of an electromagnetic reversing valve. The outlet B of the hydraulic pump is communicated with a port Q of the electromagnetic reversing valve. A port R of the electromagnetic reversing valve is communicated with an inlet of a pilot operated compound relief valve, and an outlet of the pilot operated compound relief valve is communicated with an oil tank. The single-pump and single-motor closed type hydraulic system has the advantages of simplicity and compactness in structure, stability in speed regulation and braking, low impact, long service life, high power utilization rate, low energy consumption, convenience in arrangement, low cost and convenience in popularization and application.

Description

technical field [0001] The invention belongs to the technical field of construction machinery and relates to a hydraulic system, in particular to a single-pump and single-motor closed hydraulic system for the traveling mechanism of a grader. Background technique [0002] A motor grader is a self-propelled wheeled earthmoving machine, which uses scrapers installed between the front and rear axles of the machine and various other auxiliary operating devices for shaping and leveling operations in earthworks. The grader is a high-speed, high-efficiency, high-precision and multi-purpose construction machine, which is widely used in large-scale ground construction such as roads, farmland, and airports. The main operations include ground leveling, trenching, scraping, and bulldozing It is an indispensable and important machine in the construction of the national economy. [0003] In the second half of the 20th century, with the development of hydraulic technology, hydraulic techno...

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Problems solved by technology

The hydraulic system used by most graders in my country is an open hydraulic system. The open hydraulic system has a certain rigid impact in the process of starting, reversing, and braking, and the energy loss is relatively large, and the power utilization rate is low. In addition, the leveling The synchronization of the machine operation needs to be controlled by various control elements in the system, and the differences in the manufacturing accuracy and anti-interference ability of each control element make it difficult to control the synchronization of the operation of the full hydraulic motor grader.

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