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

Abstract

The invention discloses a single-pump and single-motor open type hydraulic system for a travelling mechanism of a land leveler. The single-pump and single-motor open type hydraulic system comprises a hydraulic pump and a hydraulic motor. An outlet of the hydraulic pump is communicated with a port B of a first cartridge valve, a port R of an electromagnetic reversing valve, a port D of a second cartridge valve and a port J of a fourth cartridge valve. A port T of the electromagnetic reversing valve is communicated with a port L of the fourth cartridge valve and a port P of a fifth cartridge valve, a port U of the electromagnetic reversing valve is communicated with a port F of the second cartridge valve and a port I of a third cartridge valve, and a port E of the second cartridge valve and a port N of the fifth cartridge valve are communicated with a port X of the hydraulic motor. A port H of the third cartridge valve and a port K of the fourth cartridge valve are communicated with a port Y of the hydraulic motor, a port G of the third cartridge valve and a port M of the fifth cartridge valve are communicated with a port A of the first cartridge valve and then with an oil tank. A port C of the first cartridge valve is communicated with a relief valve. The single-pump and single-motor open type hydraulic system has the advantages of simplicity and compactness in design, capability of greatly improving quality of hydraulic oil in the system, adaptability to severe working environments, introduction of the cartridge valves, low cost in production, operation and maintenance, and convenience in popularization and use.

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 open 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 technol...

AI Technical Summary

Problems solved by technology

The hydraulic system used by most foreign grader traveling mechanisms is a closed hydraulic system. The closed hydraulic system detects and feeds back the output of the hydraulic motor, which largely eliminates or suppresses the influence of unfavorable factors. Synchronous operation with higher precision can also maximize the working efficiency of the motor grader, but the closed hydraulic system has the disadvantages of complex system design, high production, operation and maintenance costs, etc.

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