Double-pump confluence paver load-sensitive hydraulic system and control method thereof

Abstract

The invention discloses a double-pump confluence paver load-sensitive hydraulic system which comprises an open type variable displacement piston pump, and a high-pressure port Pp and a feedback port PL of the open type variable displacement piston pump are connected with an inlet P and a signal port Ls of a hydraulic multi-way valve correspondingly. Control ports of all control modules of the hydraulic multi-way valve are connected with oil ports of hydraulic motors in a hydraulic motor set, an angle sensor used for monitoring the displacement adjusting degree of the open type variable displacement piston pump is installed on the open type variable displacement piston pump, and a gear pump is installed at the rear end of the open type variable displacement piston pump or an output port of an engine in series. An oil outlet of the gear pump is respectively connected with a conduction end A1 of a one-way valve and an inlet A2 of an electromagnetic switch overflow valve, and a cut-off end B1 of the one-way valve is connected with a high-pressure port Pa of the open type variable displacement piston pump. The invention further discloses a control method of the double-pump confluence paver load-sensitive hydraulic system. According to the double-pump confluence paver load-sensitive hydraulic system and the control method thereof, the wide-range flow requirement of the system can be met, the displacement of the open type variable displacement piston pump is reduced, and the design cost of the system is reduced.

Description

Technical field [0001] The present invention relates to a paver load-sensitive hydraulic system and a control method thereof, which belongs to the hydraulic technology of the paver. Background technique [0002] The paver is a special construction equipment used to spread all kinds of grade highways, municipal roads, airports, parking lots and other grassroots stabilizers and surface-layered asphalt mix materials, which is of great significance to the construction quality of the road. The power transmission and control of the paver is mainly achieved by hydraulic transmission systems. According to the structure and function of the paver, the hydraulic system is mainly driven by left / right rows, left / right fractures drive hydraulic system. , Left / right transfusion drive hydraulic system, vibrating drive hydraulic system, vibration drive hydraulic system, generator drive hydraulic system, and cylinder assist drive hydraulic system and other components. [0003] For small and ...

AI Technical Summary

Problems solved by technology

However, the hydraulic system of the paver requires a wide flow range according to the paving width and paving speed, which requires an open variable piston pump with a larger displacement under the same number of hydraulic motor configurations. , in order to meet a wide range of flow requirements

In practice, most working conditions of the paver hydraulic system work at about 60% of the maximum displacement of the open variable plunger pump, so an open variable plunger pump-hydraulic multi-way valve-multiple hydraulic motors are used The load-sensing hydraulic system not only increases the system cost due to the increase of the displacement of the open variable piston pump, but also makes the installation of the open variable piston pump more difficult

Images