An Excavator Boom Potential Energy Reuse System

Abstract

The invention discloses an excavator big arm potential energy reuse system. The excavator big arm potential energy reuse system comprises an energy storage device oil way, a big arm rodless cavity oil way and a master control valve big arm rodless cavity oil way; a two-position five-way electromagnetic direction-changing valve is additionally arranged between the energy storage device oil way and the master control valve big arm rodless cavity oil way, and a piston type energy storage device, an overflow valve and a three-position five-way hydraulic direction-changing valve are arranged on the energy storage device oil way; a pressure relay is arranged on the big arm rodless cavity oil way, a stop valve is arranged on the master control valve big arm rodless cavity oil way, one end of the stop valve is connected with the P1 end of the two-position five-way electromagnetic direction-changing valve, the other end of the stop valve is connected with the B end of the two-position five-way electromagnetic direction-changing valve, one end of the three-position five-way hydraulic direction-changing valve is connected with the A end of the two-position five-way electromagnetic direction-changing valve, the other end of the three-position five-way hydraulic direction-changing valve is connected with a big arm lifting and extending guide device, and the T end of the two-position five-way electromagnetic direction-changing valve is connected with an oil return tank. By means of the mode, big arm potential energy utilization can be achieved.

Description

Technical field [0001] The invention relates to the technical field of excavators, in particular to a system for reusing the potential energy of an excavator's boom. Background technique [0002] In the prior art, the utilization rate of the engine output power of the excavator is very low. Generally, the utilization rate of the normal working engine power is about 44%-46%, and the power loss is generally the large arm, the middle arm, and the bucket. The potential energy loss of turning start and braking, overflow loss and some additional leakage of pumps, valve groups, motor cylinders, etc., and the loss of different loads of different working devices when working at the same time, in order to achieve work coordination , Negative control and positive control systems use valve stem throttling to control the reasonable distribution of flow, and load-sensing systems also need pressure compensation valves to distribute flow reasonably, which will cause a lot of power loss. The cur...

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Problems solved by technology

[0002] In the prior art, the utilization rate of the engine output power of the excavator is very low. Generally, the utilization rate of the normal working engine power is about 44%-46%. The power loss is generally caused by the large arm, middle arm, and bucket. Potential energy loss, potential energy loss of slewing starting and braking, overflow loss and some additional leakage of pumps, valve groups, motor cylinders, etc., and the loss of different loads of different working devices when working at the same time, in order to achieve work coordination , the negative control and positive control systems use valve stem throttling to control the reasonable distribution of flow, and the load sensing system also needs to use pressure compensation valves to distribute the flow reasonably, which will cause a lot of power loss

The current rotary potential energy reuse is used on the hybrid excavator. The principle is to use the energy lost by the rotary brake to store it in the nickel-cadmium battery through power generation, but the potential energy loss of the boom is more serious.

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