Hydraulic excavator pilot hydraulic preheating system and method

Abstract

The invention discloses a hydraulic excavator pilot hydraulic preheating system which comprises a pilot oil source block, a hydraulic oil tank, a soil pushing pilot valve, a right handle pilot valve, a foot pilot valve, a left handle pilot valve, a preheating flow dividing block, an oil supply flow dividing block and an oil return flow dividing block; the pilot oil source block is connected with the preheating flow dividing block and connected with a tee-joint on each pilot valve after flow division; the oil supply flow division block is connected with the tee-joint on each pilot valve and connected with the pilot oil source block after gathering; the oil return flow dividing block is connected with a T-shaped opening of each pilot valve and connected with the hydraulic oil tank after gathering. In the excavator idling state, the preheating pilot hydraulic system can ensure stable oil temperature increase even when in the extreme cold environment, the pilot valves are prevented from working in the extreme using condition, the phenomenon that internal sealing components of the pilot valves lose efficacy and are damaged in advance is effectively avoided, the reliability is improved, the maintenance cost is lowered, and the service life of the whole excavator is prolonged.

Description

technical field [0001] The invention relates to the field of excavators, in particular to a pilot hydraulic preheating system for a hydraulic excavator. Background technique [0002] The hydraulic excavator needs to preheat the hydraulic system when working in an extremely cold environment. If the proper temperature is not reached, the sealing effect of the seal will be affected, reducing its life, and even damage the oil leakage. The conventional hydraulic system preheating process is: after the engine is started, the excavator is in a standby state, and the hydraulic oil reaches the neutral position of the main valve through the main pump to unload and then returns to the oil tank. During this process, the hydraulic oil is cut off by the main valve to generate heat to heat the system. , so as to achieve the effect of preheating. During this process, the circulating hydraulic oil only passes through the main pump and main valve, not the pilot system, and the pilot system w...

AI Technical Summary

Problems solved by technology

At this time, the action of the excavator will inevitably cause a large temperature difference inside the pilot valve, which will induce the failure of the sealing element in the valve and destroy its sealing effect, resulting in later damage and oil leakage, reducing reliability and increasing maintenance costs.

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