Speed-adjustable high-thrust hydraulic lifting table

Abstract

The invention relates to a speed-adjustable high-thrust hydraulic lifting table. The speed-adjustable high-thrust hydraulic lifting table comprises a lifting platform, a hydraulic cylinder, a control valve group, an oil supply system, a controller, an oil tank, a speed adjusting valve, a booster, a two-position two-way reversing valve and a stepper motor; the lifting platform is connected to a push rod of the hydraulic cylinder; and the oil supply system can suck oil from the oil tank and supply the oil to the hydraulic cylinder. The oil supply system supplies the oil to the hydraulic cylinder via the speed adjusting valve, the control valve groupand the booster in sequence; and the controller is electrically connected with the two-position two-way reversing valve, the stepper motor, the speed adjusting valve and the oil supply system. The hydraulic lifting table has two characteristics of adjustable moving speed of the lifting platform and large thrust supplied by the hydraulic cylinder. In addition, the control valve group consisting of a valve element rotary reversing valve and cartridge valves is used for replacing a slide valve, the conversion of oil flowing directions of the hydraulic system can be realized, and the circulating capacity is greater, so that the lifting table is suitable forhigh-flow places.

Description

technical field [0001] The invention relates to a lifting device, in particular to an adjustable-speed and high-thrust hydraulic lifting platform. Background technique [0002] Lifting platform is a kind of machinery for transporting people or objects vertically, which is widely used in cargo transportation at different heights, high-altitude installation and maintenance and other operations. According to the different structures, the lifting platform can be divided into scissor lifting platform, guide rail lifting platform, aluminum alloy lifting platform and cylinder lifting platform. [0003] According to different driving methods, the lifting platform can also be divided into a lifting platform based on a motor drive method, a wave maker based on a pneumatic drive method, and a lifting platform based on a hydraulic drive method. The lifting platform based on the motor drive mode has a weak load capacity due to the small torque output of the motor; if the lifting platfor...

AI Technical Summary

Problems solved by technology

[0005] The reversing valve used in the existing hydraulic lifting platform is usually in the form of a spool valve, and the reversing valve in the form of a spool valve has poor flow capacity and is not suitable for large flow occasions

The reversing valve in the form of a slide valve realizes the conversion of the oil flow direction through the linear reciprocating movement of the spool. During the reversing process, the unbalanced reciprocating speed of the spool will easily cause the piston movement of the hydraulic cylinder to be unstable, that is, it is difficult to ensure the lifting Smooth operation of the platform

In addition, the oil supply system of the hydraulic lifting platform often supplies oil to the hydraulic cylinder with a constant flow rate, and the moving speed of the lifting platform cannot be adjusted according to the actual situation.

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