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Hydraulic system and control method capable of providing suitable performance for load

A technology of hydraulic system and control method, which is applied in the field of hydraulic system to achieve the effect of low cost and simple structure

Active Publication Date: 2018-02-23
LINDE CHINA FORKELEVATOR TRUCK CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention provides a hydraulic system and a hydraulic control method that can provide suitable performance for the load, which overcomes the problem that the displacement of the forklift hydraulic pump in the prior art cannot meet both high-load and low-load conditions

Method used

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  • Hydraulic system and control method capable of providing suitable performance for load
  • Hydraulic system and control method capable of providing suitable performance for load

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Embodiment Construction

[0023] Examples, see figure 1 , figure 2 As shown, a hydraulic system of the present invention that can provide suitable performance for loads includes a working valve 4 of industrial machinery or engineering machinery, and the working valve 4 is connected with an actuator for controlling cargo lifting. In this embodiment, the industrial machinery or construction machinery refers to a forklift, and the actuator is a lifting cylinder 5 .

[0024] The present invention also includes a first hydraulic pump 2, a second hydraulic pump 8 and a control valve. The first hydraulic pump 2 is used as the main oil supply pump for the working valve 4. Once the working valve 4 has a flow demand, it will provide the oil for the working valve 4. Pressure oil: the second hydraulic pump 8 is configured to provide pressure oil to the working valve 4 when the working oil pressure of the working valve 4 is lower than a set value. The control valve is used to control whether the second hydraulic...

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Abstract

The invention discloses a hydraulic system and control method capable of providing suitable performance for a load. The hydraulic system comprises a working valve of an industrial machine or an engineering machine and further comprises at least one first hydraulic pump, at least one second hydraulic pump and a control valve. The working valve is connected with an execution mechanism; the first hydraulic pumps are configured to provide pressure oil for the working valve; the second hydraulic pumps are configured to provide the pressure oil for the working valve when the working oil pressure ofthe working valve is smaller than a set value; and the control valve is used for controlling the second hydraulic pumps to provide the oil for the working valve or not provide the oil for the workingvalve, and the control valve is connected in the position, between an oil outlet of one of the second hydraulic pumps and an oil inlet of the working valve, of an oil way. The suitable hydraulic performance can be provided for the actual load; the performance requirement of a forklift under the high-load working condition can be met, and the performance requirement of the forklift under the low-load working condition can be further met; and the power of an engine can be utilized effectively.

Description

technical field [0001] The invention relates to a hydraulic system, in particular to a hydraulic system and a hydraulic control method which can provide suitable performance for a load. Background technique [0002] When the forklift lifts goods, the hydraulic pump supplies oil to its working valve, and the working valve then delivers oil to the lifting cylinder. The hydraulic pump is driven by the engine. The pump displacement design of the hydraulic pump is largely limited by the output torque of the engine. Considering the maximum load condition of the forklift, the pump displacement of the hydraulic pump is often not too high. However, under low-load (light cargo) conditions, due to the limited pump displacement of the hydraulic pump, the lifting speed of the cargo is still slow, so that the work efficiency cannot be improved, and it does not meet the actual use requirements. Although the above-mentioned problems can be improved by using a variable displacement pump, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15B11/08F15B13/04F15B21/04B66F9/22B66C13/20
CPCB66C13/20B66F9/22F15B11/08F15B13/04F15B21/041F15B2211/20576F15B2211/615Y02P80/10
Inventor 陈龙寅
Owner LINDE CHINA FORKELEVATOR TRUCK CORP
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