Hydraulic oil temperature control system and engineering machinery

Abstract

The invention provides a hydraulic oil temperature control system and engineering machinery. The hydraulic oil temperature control system comprises a pump, a main oil tank, an oil return circuit, a radiator, an auxiliary oil tank, a reverse valve, a temperature sensor and a controller. When the hydraulic oil temperature in the main oil tank is higher than a preset value, the controller controls the reverse valve to cut off the oil circuit between the radiator and the main oil tank and communicates with another oil circuit between the radiator and the auxiliary oil tank; when the hydraulic oil temperature in the main oil tank is lower than the preset value, the controller controls the reverse valve to cut off the oil circuit between the radiator and the auxiliary oil tank and communicates with the oil circuit between the radiator and the main oil tank. By the arrangement, the auxiliary oil tank can be selectively connected or disconnected according to the hydraulic oil temperature in the main oil tank, so that the hydraulic oil temperature can be sustained within the best temperature range, leakage of hydraulic oil can be further reduced, and operation efficiency of the hydraulic system can be improved while the service life of the same can be prolonged.

Description

technical field [0001] The invention relates to the field of hydraulic technology, in particular to a hydraulic oil temperature control system and engineering machinery. Background technique [0002] In the hydraulic system of construction machinery, the effective volume of the hydraulic oil tank should be 3-7 times the flow rate of the main pump. 0.6 times, resulting in too short a hydraulic oil cycle and reduced service life. The hydraulic oil temperature of construction machinery is controlled at 30-50°C for the best performance. When the oil temperature is higher than 65°C, the viscosity of the oil will decrease, the oil film will be easily damaged, the leakage will increase, and the efficiency will decrease. If the working temperature of the hydraulic oil is higher than the optimal temperature, when the oil temperature is higher than 65°C, the service life of the hydraulic oil and hydraulic components will be reduced by half for every 10°C increase. [0003] In order ...

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Problems solved by technology

[0003] In order to reduce the temperature of the hydraulic oil and avoid high temperature and low efficiency, many construction machinery manufacturing companies usually adopt the following two solutions: one is to use a larger pulley or a larger radiator to reduce the hydraulic oil temperature by increasing the air intake, but This will reduce the efficiency of the engine, or black smoke will appear at low gears; the second is to use the heat exchange of the air conditioner to take away the heat of the hydraulic oil, thereby reducing the temperature of the hydraulic oil, but this solution will increase the cost, and the fuel consumption of the engine will decrease. Increased, but also cause the phenomenon of engine water temperature is too high

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