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A hydraulic system and hydraulic control method that can provide suitable performance for a load

A technology of hydraulic system and performance, applied in the field of hydraulic system, to achieve the effect of simple structure and low cost

Active Publication Date: 2020-03-06
LINDE CHINA FORKELEVATOR TRUCK CORP
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  • Summary
  • 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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  • A hydraulic system and hydraulic control method that can provide suitable performance for a load
  • A hydraulic system and hydraulic control method that can provide suitable performance for a 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 a hydraulic control method capable of providing suitable performance for loads. The hydraulic system includes a working valve of industrial machinery or engineering machinery, and the working valve is connected with an actuator; it also includes: at least one first hydraulic pressure The pump is configured to provide pressure oil to the working valve; at least one second hydraulic pump is configured to provide pressure oil to the working valve when the working oil pressure of the working valve is lower than a set value; the control valve is used to Controlling whether the second hydraulic pump supplies oil to the working valve, the control valve is connected to the oil circuit between the oil outlet of the second hydraulic pump and the oil inlet of the working valve. The invention can provide suitable hydraulic performance for the actual load, can meet the performance requirements of the high-load working condition and the low-load working condition of the forklift, and can effectively utilize the power of the engine.

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