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Electric fork track lifting control system possessing energy recovery device

An electric forklift and energy recovery technology, applied in the direction of hoisting device, can solve the problems of insufficient use of motor power, low operating efficiency of hydraulic system, and improvement in efficiency, so as to achieve high-efficiency control, improve operating efficiency, and improve The effect of using time

Inactive Publication Date: 2006-09-13
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

At present, most electric forklifts adopt throttling speed regulation to adjust the lifting speed, resulting in low operating efficiency of the hydraulic system and large energy loss.
The power of the motor cannot be fully utilized, the no-load speed of the forklift is basically the same as the full-load speed, and the lifting efficiency needs to be improved

Method used

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  • Electric fork track lifting control system possessing energy recovery device
  • Electric fork track lifting control system possessing energy recovery device
  • Electric fork track lifting control system possessing energy recovery device

Examples

Experimental program
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Embodiment Construction

[0016] The invention includes a permanent magnet brushless DC motor 1, a pump-motor 2, an oil supply device 3, an electro-hydraulic servo valve 4, a lifting oil cylinder 5, a control device 6, and a lead-acid storage battery 7. Its interconnection relationship is as follows:

[0017] 1) The permanent magnet brushless DC motor 1 is connected to the pump-motor 2 whose displacement is equivalent to the area of ​​the two cavities of the lifting cylinder.

[0018] 2) The P port and the T port of the electro-hydraulic servo valve 4 are respectively connected with the oil discharge port and the oil suction port of the pump-motor 2, and the A port and the B port of the electro-hydraulic servo valve 4 are connected with the rodless chamber and the lift cylinder 5 respectively. There are rod cavities connected. The oil supply device 3 is connected to the oil discharge port and the oil suction port of the pump-motor 2, and is connected to the P port and the T port of the electro-hydraul...

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Abstract

A lift control system able to recover energy for electric fork truck is composed of motor, pump-motor unit, oil supplying unit, electro-hydraulic servo valve, lifting cylinder, controller and electric accumulator set. When said lifting cylinder works in raising up and lowering down procedures, the motor works in regenerative braking mode for recovering the braking energy and storing it in accumulator set. When the weight is lowered down, its potential makes the motor rotate reversely by pump-motor unit to generate electric energy and storing it in accumulator set.

Description

technical field [0001] The invention belongs to the field of electric forklift lifting device control, in particular to an electric forklift lifting control system with energy recovery, which can recover and control the braking energy in the braking process of the electric forklift lifting device and the potential energy of heavy objects in the process of falling heavy objects . Background technique [0002] In recent years, with the development of industrial technology worldwide, the problems of energy shortage and environmental pollution have become increasingly serious. Electric forklifts, a product that integrates electronic technology and hydraulic technology, are changing rapidly. At present, electric forklifts account for 50% of the stock in foreign markets. ~60%, while the current holdings in my country account for about 15~20%, which has a broad market prospect. The electric forklift lifting device mostly adopts the driving method of motor-h...

Claims

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Application Information

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IPC IPC(8): B66F9/22
Inventor 梁晋叶敏李舒欣武小兰曹秉刚
Owner XI AN JIAOTONG UNIV
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