Energy-saving electrocar for loading unloading and transporting

Abstract

An energy-saving electric vehicle for loading, unloading and transporting goods is composed of electric accumulator as power source, hydraulic drive systemwith microprocessor control unit for controlling the electric vehicle and hydraulic pump set, the potential energy and kinetic energy recovering unit, the speed regulating unit consisting of motor and variable pump, and the multiple stages combined hydraulic oil tank.

Description

technical field [0001] The invention relates to an energy-saving loading and unloading electric vehicle, in particular controlled by a microcomputer and fully hydraulically driven. It has dual speed regulation technology of variable frequency motor-variable pump and regeneration and recovery technology of kinetic energy and potential energy. Background technique [0002] Existing loading and unloading vehicles, including counterbalanced electric forklifts, forward-moving electric forklifts, multi-directional electric forklifts, stacking electric vehicles, etc., all belong to the category of loading and unloading electric vehicles, and all use multiple motor drive schemes, that is, walking drive devices It is equipped with a single motor or two motors, and the lifting, tilting and steering devices are driven by one motor respectively. Some foreign manufacturers configure a generator in the process of potential energy recovery. As a result of the configuration of multiple mo...

AI Technical Summary

Problems solved by technology

[0005] (1) The DC motor needs to be equipped with a commutator and a carbon brush device, which must be maintained regularly, so the maintenance cost is high;

[0006] (2) No kinetic energy, potential energy regeneration and recovery function;

[0007] (3) Step variables increase the number of operations and lower loading and unloading efficiency;

[0008] (4) There is throttling speed regulation loss;

[0009] (5) The use of step variable pumps and step variable motors increases the cost, and the speed regulation range is small;

[0010] (6) The two-speed hydraulic motor is a step-variable motor, and the efficiency will drop by 18% during variable-level operation

[0012] (1) The efficiency of the discharge capacity is low; due to the operation of multiple motors, the motors are frequently started frequently

In order to speed up loading and unloading operations, forklift operators often run in the reverse direction when the forklift is moving forward, which may burn out the electronic power components of the frequency conversion controller, and the overload and high current discharge of the lifting and climbing will reduce the discharge capacity efficiency of the battery

[0013] (2) Throttling loss; At present, most foreign electric forklifts use variable frequency speed regulating motors to drive quantitative gear pumps or vane pumps to provide hydraulic oil to drive lifting and tilting cylinders, because the performance of gear pumps and vane pumps drops sharply when they are below 500 rpm

[0014] (3) The structure and manufacturing process of the whole machine are complicated, and the production cost is high; although foreign electric vehicles are gradually developing to AC frequency conversion speed regulation, their transmission mechanisms are almost unchanged. Due to the use of multiple motor drives and multiple sets of control systems, the layout of the whole machine Complicated, difficult to manufacture, high cost of process tooling

Different transmission chains are needed in different varieties of products, which is not convenient for production and management

[0015] (4) The cost of use is high; because the products do not meet the "three modernizations" and the spare parts cannot be interchanged, the inventory of spare parts for maintenance is huge, the maintenance cycle is prolonged, and the maintenance cost increases

[0016] (5) The new product design cycle is long; due to the complex product structure, the workload of new product design increases, and the process and tooling are complicated, resulting in a long new product development cycle

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