Forklift efficient energy-saving system with speed regulating function

A high-efficiency, energy-saving and functional technology, applied in the components of fluid pressure actuation system, lifting device, fluid pressure actuating device, etc., can solve the problem of low control precision of manual reversing valve, large energy loss of throttling and speed regulation, and hydraulic oil circuit. Changes and other problems, to achieve the effect of prolonging the use time of a single charge and discharge, eliminating throttling loss, and simple control

Pending Publication Date: 2018-07-20
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Taking Chinese patent 201210128114.5 as an example, energy regeneration and recovery are realized through a multi-way valve, but the structure of the multi-way valve is complex and there are many oil circuits. The forklift steering system and lifting system are designed in one hydraulic system, and the hydraulic oil circuit changes greatly. high operational complexity
[0006] Taking Chinese pate

Method used

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  • Forklift efficient energy-saving system with speed regulating function
  • Forklift efficient energy-saving system with speed regulating function
  • Forklift efficient energy-saving system with speed regulating function

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1, the first working state.

[0032] When the fork is lifted, the control device receives the lifting signal of the fork. At this time, the second voltage sensor A5 detects the voltage across the supercapacitor A2. If the voltage across the supercapacitor A2 is not lower than the rated voltage, the control device controls the first The second relay A6 is turned on, and the supercapacitor A2 provides electric energy for the moment when the forklift is lifted. The power supply time is 1 to 2 seconds or until the voltage of the supercapacitor A2 is less than 20V, and then the control device controls the second relay A6 to turn off, and the first relay A5 to turn on. The battery A1 supplies power to the forklift lifting system. At this time, the three-phase bridge inverter turns on the DC power of the supercapacitor A2 or battery A1, and the control device controls the three-phase bridge inverter MOS tubes B3, B13, B7, B5, B11, and B9 to turn on in sequence, and ...

Embodiment 2

[0033] Embodiment 2, the first working state.

[0034] When the fork is lowered, the lift cylinder 5 returns oil to the rodless cavity, the two-way hydraulic lock valve 4 is opened, and the hydraulic oil flows through the two-way hydraulic lock valve 4 into the double-acting pump-motor 2, driving the double-acting motor 2 to reverse. At this time, the double-acting motor 2 works in a pump state. The pump drives the double-acting motor 1 to reverse. At this time, the double-acting motor 1 works in the generator state, and the generator generates electricity to charge the supercapacitor A2 or the battery A1 through the three-phase bridge inverter. When the lowering speed of the fork is too fast, the current sensor and speed encoder on the generator will transmit the working speed and torque state of the generator to the control device, and the control device will compare the actual speed signal of the generator with the given speed to calculate the stator flux linkage. For the ...

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PUM

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Abstract

The invention provides a forklift efficient energy-saving system with a speed regulating function. The forklift efficient energy-saving system comprises a double-acting motor-power generator, a double-acting pump-motor, a sealing pressure oil tank, a liquid-control oil supplementing valve, a two-way hydraulic lock valve, a jacking oil cylinder, a safety valve, a three-phase bridge type inverter, an energy supply-energy storage device, a control device, and an oil tank, wherein the double-acting pump is connected with the double-acting motor-power generator; the double-acting motor-power generator is connected with the three-phase bridge type inverter; the three-phase bridge type inverter is connected with the energy supply-energy storage device; the control device controls a workings stateof the three-phase bridge type inverter and the energy supply-energy storage device; an oil outlet and an oil sucking hole of the double-acting pump-motor are connected with the liquid-control oil supplementing valve; the liquid-control oil supplementing valve is connected with the two-way hydraulic lock valve; the two-way hydraulic lock valve is connected with a rod cavity and a rodless cavity of the jacking oil cylinder; and the rod cavity and the rodless cavity of the jacking oil cylinder are connected with the safety valve. A potential energy recycling system regulates forklift descendingspeed by controlling rotation speed of the double-acting motor-power generator, eliminates throttling loss of a hydraulic loop, reduces heating of hydraulic oil, improves potential energy recycling efficiency; and moreover, system hardware and software are simple and reliable, and realizable degree is high.

Description

technical field [0001] The invention relates to an energy-saving system for a forklift, in particular to a high-efficiency energy-saving system for a forklift with a speed regulating function. Background technique [0002] In recent years, the scale of China's logistics industry has continued to grow rapidly, and the total cost of social logistics accounts for a high proportion of GDP. As the core handling equipment of the logistics industry, forklifts are of great significance to ensure transportation efficiency and enhance economic strength. In 2015, the total sales volume of forklift trucks in the world was 1.0642 million units, and the sales volume of forklift trucks in my country was 327,600 units, accounting for 30.7% of the total sales volume. It ranked the world's largest forklift truck consumption market for 7 consecutive years. However, in forklift products, due to the late start of the industry in my country, the sales volume of electric forklifts accounts for abo...

Claims

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Application Information

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IPC IPC(8): B66F9/22F15B11/08F15B13/01F15B13/044F15B21/02F15B21/14
CPCB66F9/22F15B11/08F15B13/01F15B13/044F15B21/02F15B21/14F15B2211/20515F15B2211/88
Inventor 童水光单玉爽从飞云童哲铭张鑫磊唐宁余跃
Owner ZHEJIANG UNIV
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