Load sensing heat dissipation braking variable system of loading machine

Abstract

The invention discloses a load sensing heat dissipation braking variable system of a loading machine. The load sensing heat dissipation braking variable system of the loading machine is characterized by mainly being composed of a variable displacement piston pump, a parking braking valve, a first energy accumulator, a second energy accumulator, a braking valve and a load sensing prefilling valve in an integral mode. A pressure oil port of the load sensing prefilling valve is connected with a pressure oil port of the variable displacement piston pump. Pressure oil is provided for the energy accumulators and working devices in a prefilling state. Pressure oil used for controlling a limit switch (LS) is output to control the variable displacement piston pump to provide flow required by a system. Priority of prefilling is maintained. A temperature signal of the heat dissipation system is converted into an electric signal to control an electric proportional pressure reducing valve in the load sensing prefilling valve, and the prefillig is prior. The variable displacement piston pump is a load sensing plunger pump comprising an LS control valve and a pressure stop valve and is capable of controlling a variable pump tilting tray to provide the flow required by the system. The load sensing heat dissipation braking variable system of the loading machine has the advantages of being easy to realize, saving in energy, and suitable for being used on loading machines of various tonnage.

Description

technical field [0001] The invention relates to a heat dissipation braking system applied to construction machinery, in particular to a heat dissipation braking variable system of a load sensing loader. Background technique [0002] Usually, the quantitative system is widely used in the cooling and braking system of loaders. Although the quantitative system can meet the various performances of the cooling system and the braking system, the application of the load sensing system has put the topic of energy saving on the agenda, making the load transmission The application of sense is more and more favored by people. Not only the load sensing system, but also new systems such as positive flow system and negative flow system have already been applied to excavators, cranes and more road machinery, but these new technologies are rarely promoted on loaders. The operation of a loader is not as sensitive as an excavator, nor is it as large as a crane. The technology of the loader i...

AI Technical Summary

Problems solved by technology

Not only the load sensing system, but also new systems such as positive flow system and negative flow system have already been applied on excavators, cranes and more road machinery, but these new technologies are rarely promoted on loaders

The operation of a loader is not as sensitive as an excavator, nor is it like a large tonnage crane. The technology of the loader is simple, the cost is low, and the operation is convenient, so people ignore the application of these new technologies on the loader.

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