Forklift efficient energy-saving system with speed regulating function

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...

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 patent 201620398878.X as an example, the potential energy recovery of electric forklifts is realized through throttling speed regulation and variable speed volumetric speed regulation. However, the control precision of the manual reversing valve in the hydraulic system is low, and the energy loss of throttling speed regulation is large, which will also cause hydraulic oil heat, reducing system efficiency

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