Quick response device, hydraulic load sensing system and engineering vehicle

Abstract

The invention discloses a fast response device, a hydraulic load sensing system and an engineering vehicle, and relates to the field of engineering machinery. The fast response device is used for reducing the time delay time of the existing load sensing system, and comprises a load feedback valve, an oil pump and a fast response valve, wherein a first oil inlet of the fast response valve is connected with an oil outlet of the oil pump, a load oil opening of the load feedback valve is connected with a second oil inlet of the fast response valve, an oil outlet of the fast response valve is connected with a variable control mechanism of the oil pump through a load feedback oil path, when the load feedback valve is positioned in a closed state, oil liquid output by the oil outlet of the oil pump enters the fast response valve, so that the oil liquid is fully filled into the load feedback oil path. When the load feedback valve is in an opening state, oil liquid output from the oil outlet of the oil pump and oil liquid output by the load feedback valve enter the fast response valve, so that the load feedback oil path is fully filled with the oil liquid. Through the adoption of the technical scheme, the fast building of oil pressure of the load feedback oil path can be realized.

Description

Technical field [0001] The invention relates to the field of engineering machinery, in particular to a quick response device, a hydraulic load sensing system and an engineering vehicle. Background technique [0002] The hydraulic load sensing system has the advantages of high efficiency, low power loss, low energy consumption, simple and reliable control mode, and several actuators that can realize synchronous action do not interfere with each other during motion, so it has been widely used in various projects On the hydraulic system of the vehicle. The hydraulic load sensing system is the most commonly used energy-saving and environmentally friendly hydraulic control system in the industry. [0003] See figure 1 , The hydraulic load sensing system has an oil pump 11, an actuator 14, a load feedback valve 13, and a load feedback oil circuit 12. The load feedback oil passage 12 is provided between the load feedback valve 13 and the variable control mechanism of the oil pump 11. [...

AI Technical Summary

Problems solved by technology

[0006] The inventors have found that there are at least the following problems in the prior art: with the development of gigantic construction machinery, in order to reduce the number of hydraulic transmission lines, the load feedback valve 13 is often placed near the actuator 14, which is far away from the oil pump 11 At this time, the load feedback oil circuit 12 will be very long, dozens of meters or even hundreds of meters

It can be seen that the use of the existing load sensing system will inevitably lead to a delay in action, especially when it is working for the first time after standing still, the delay is particularly serious, and the response is very slow, resulting in delay in action and seriously restricting the reliability of use.

The operator often thinks that something is wrong with the machine and does not act, resulting in misoperation

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