Overload protection debugging control method, overload protection debugging control device, overload protection debugging control system and engineering machine

Abstract

The invention discloses an overload protection debugging control method, an overload protection debugging control device, an overload protection debugging control system and an engineering machine. The method includes: acquiring input opening adjustment information of an electric proportional pressure relief valve; adjusting opening of the electric proportional pressure relief valve in a hydraulic constant-pressure system according to the opening adjustment information of the electric proportional pressure relief valve; acquiring first pressure of hydraulic the constant-pressure system when the engineering machine is at a rated speed; and when the first pressure is equal to the sum of set maximum pressure and set pressure protection increment of the hydraulic constant-pressure system, outputting debugging finished prompt information. Manual visual observation of the pressure of the hydraulic constant-pressure system is not needed, and the electric proportional pressure relief valve is adjusted through electronic control and only by manually inputting the opening adjustment information thereof by a debugging personnel. Therefore, compared with the prior art, the method, the device, the system and the engineering machine have the advantages that accuracy of set pressure calibration of the pressure relief valve is improved greatly, and further energy waste is avoided while service life of the hydraulic constant-pressure system is prolonged.

Description

technical field [0001] The invention relates to the technical field of engineering machinery, in particular to a debugging control method, device and system for overload protection and an engineering machinery. Background technique [0002] In the hydraulic constant pressure system of various construction machinery such as concrete pump trucks, the overflow valve is a necessary pressure control element. Its main function is: when the pressure of the hydraulic constant pressure system reaches the set pressure of the overflow valve, the overflow valve will The flow valve begins to overflow to prevent system overload and ensure system safety. [0003] Such as figure 1 As shown, the hydraulic constant pressure system of construction machinery generally includes: an engine 4 , an oil tank 10 , a constant pressure pump 1 , a swing cylinder 3 , an overflow pressure reducing valve 2 and an accumulator 5 . The engine 4 is used as the power source to drive the power element constant...

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Problems solved by technology

[0009] The defect of this existing technology is that in step 3, the adjustment of the system pressure usually depends on the commissioning personnel to observe the data of the pressure gauge and complete the manual operation. The accuracy is low. If the protection pressure of the relief valve is adjusted to be lower than the set pressure P S , will cause the hydraulic constant pressure system to start the overflow protection prematurely, resulting in an increase in the load of the constant pressure pump and an increase in engine power, resulting in energy waste. service life and bring greater security risks

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