Hydraulic oil return system for excavator, control method of system and excavator

A technology of oil return system and excavator, which is applied in the direction of earth mover/shovel, construction, etc. It can solve the problems that the hydraulic system cannot be adjusted by feedback and cannot be adjusted, and achieve the effect of improving stability

Pending Publication Date: 2019-11-01
SHANGHAI SANY HEAVY IND
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] However, the forced heat dissipation of the hydraulic system itself is a complicated process, and the amount of heat dissipation needs to be determined according to different seasons, ambient temperature and the length of time the excavator is used
However, in the conventional

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  • Hydraulic oil return system for excavator, control method of system and excavator

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Embodiment Construction

[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

[0024] Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art wi...

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Abstract

The invention discloses a hydraulic oil return system for an excavator, a control method of the system and the excavator and relates to the technical field of engineering machinery. The system comprises a hydraulic oil tank, a main pump and a pilot pump, the main pump and the pilot pump are connected with the hydraulic oil tank separately, and the main pump is communicated with a main valve assembly through an oil supply pipe; the main valve assembly is communicated with a load and an electro-hydraulic proportional flow divider valve separately, the pilot pump is communicated with the pilot side of the electro-hydraulic proportional flow divider valve through a pilot control pipe, and a first oil return pipe and a second oil return pipe which are in parallel connection are further arrangedbetween the electro-hydraulic proportional flow divider valve and the hydraulic oil tank; the first oil return pipe or the second oil return pipe is provided with a radiator, a temperature sensor isarranged in the hydraulic oil tank, and the temperature sensor and the electro-hydraulic proportional flow divider valve are electrically connected with a controller separately, so that the electro-hydraulic proportional flow divider valve is controlled to work according to an oil temperature signal detected by the temperature sensor. The heat dissipation amount can be adjusted according to the oil temperature of the hydraulic system, and the stability of the oil temperature when the hydraulic system of the excavator works is improved.

Description

technical field [0001] The invention relates to the technical field of engineering machinery, in particular to an excavator hydraulic oil return system, a control method thereof, and an excavator. Background technique [0002] The hydraulic excavator is a kind of high-power construction machinery. During the working process, due to factors such as throttling and viscous friction of the hydraulic system, a large amount of heat will be generated, which will heat up the hydraulic system and affect the system life and performance indicators of the excavator. In order to keep the hydraulic oil temperature of the excavator in a suitable temperature range, it is necessary to consider the heat dissipation of the high temperature return oil of the hydraulic system. Due to the small volume of the hydraulic oil tank of the excavator, the heat dissipation capacity of this natural heat dissipation state is small, and the hydraulic oil temperature of the excavator cannot be guaranteed whe...

Claims

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Application Information

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IPC IPC(8): E02F9/22
CPCE02F9/2289
Inventor 刘登科李中才伍荣伟
Owner SHANGHAI SANY HEAVY IND
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