Pilot control system of novel hydraulic excavator

Abstract

The invention discloses a pilot control system of a novel hydraulic excavator. The pilot control system comprises a first pilot overflow valve, a hydraulic pump and a second pilot overflow valve, wherein one end of the hydraulic pump is connected in parallel with one end of the second pilot overflow valve and connected in series with one end of the first pilot overflow valve, the other end of thehydraulic pump and the other end of the second pilot overflow valve extend into an oil tank together, and both the first pilot overflow valve and the second pilot overflow valve are provided with a temperature adjustor; the pilot control system also comprises a controller and an energy accumulator; the other end of the first pilot overflow valve is connected with the energy accumulator and then connected with a travel motor assembly through an electromagnetic proportional pressure reducing valve; and the electromagnetic proportional pressure reducing valve is connected with the controller. The pilot control system of the novel hydraulic excavator has quick response to input signals, is convenient to install, use and maintain, has high reliability, has no additional cost, and has wide application.

Description

technical field [0001] The invention relates to the technical field of excavator control, in particular to a novel hydraulic excavator pilot control system. Background technique [0002] Due to the complex working environment of the excavator, in order to adapt to different terrain conditions, the excavator needs to switch between high and low speeds. In order to switch between the two walking speeds during work, the excavator pilot control system must be able to support high and low speed switching. [0003] The structure block diagram of the current high-low speed switching pipeline including the pilot control system of the excavator is as follows: figure 1 As shown, it is mainly composed of electromagnetic directional valve 1, pilot relief valve 2 and traveling motor assembly 3, wherein traveling motor assembly 3 includes interconnected traveling motor 31, traveling motor regulator 32 and traveling high and low speed regulating valve 33. When working, the electromagnetic...

AI Technical Summary

Problems solved by technology

The advantage of this system is that the pressure adjustment is completed by the pilot relief valve, and the number of components is small. The disadvantages are: (1) The pressure of the travel switching pipeline will fluctuate with the pressure of the pilot system, and the situation is unstable. When the travel motor 31 main oil port When the pressure fluctuations of A and B cause high pressure in the travel switching pipeline, all components in the system will bear the impact of high-pressure pulse hydraulic oil, which will affect the life of the components; (2) The system can only support two speeds of travel motors, which cannot meet the requirements Multiple speeds and infinitely variable needs

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