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electric construction machinery

A construction machinery and electric technology, applied in construction, motor generator/starter, single multi-phase induction motor starter, etc., can solve the problems of expensive equipment, large volume, high price of reactors, etc.

Inactive Publication Date: 2017-09-22
NIHON KENKI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] When the power supply car shown in the above-mentioned Patent Document 2 uses the reactor shown in the above-mentioned Patent Document 4, it can be mounted on either the electric construction machine or the power supply car, but the capacity suitable for the electric power specification of the electric construction machine will make the The volume becomes larger, resulting in constraints on the installation space
In addition, this reactor is expensive, and the equipment cost becomes expensive when it is mounted on an electric construction machine or a power supply vehicle.

Method used

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Experimental program
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Embodiment Construction

[0064] Embodiments of the electric construction machine of the present invention will be described below with reference to the drawings.

[0065] figure 1 It is a figure which shows the electrohydraulic excavator which comprises one embodiment of the electric construction machine of this invention, and is a perspective view except the electric power supply system.

[0066] Such as figure 1 As shown, an electrohydraulic excavator according to one embodiment has crawler belts and includes a traveling body 2 that moves back and forth and left and right. A rotating body 3 is arranged on the running body 2 . Although not shown, the revolving body 3 can rotate relative to the running body 2 via a bearing mechanism present between the running bodies 2 . In addition, a working device 4 is provided at the front of the revolving body 3 , a counterweight 9 is provided at the rear, a cab 5 is provided at the left front, and a control panel 20 with a control device 21 inside is provided...

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Abstract

The invention relates to an electric construction machine. When a power supply vehicle is used as a power source, it is possible to suppress an overcurrent generated in a star-delta connection circuit due to startup of an electric motor without using a reactor. The control device of the present invention has a power source discriminating unit that discriminates which one of the cable of the commercial power supply or the power supply vehicle is connected to, and a circuit switching control unit that controls the circuit switching unit based on a signal from the power discriminating unit. After the commercial power supply is turned on, the circuit switching control part controls the circuit switching part when the electric motor is started, so that the star-delta connection circuit becomes a star connection circuit. Starting at start-up, continuing to make the star-delta connection circuit into a delta connection circuit.

Description

technical field [0001] The present invention relates to an electric construction machine such as an electric hydraulic excavator using electric power as a driving source. Background technique [0002] In recent years, the demand for energy saving and improvement of environmental resistance has continued to increase at the construction site of construction machinery. In order to respond to this, construction machinery manufacturers have provided electric construction machinery that is equipped with an electric motor instead of an engine and drives a hydraulic system. [0003] As the prior art of an electric construction machine, there exists a technique shown in patent document 1. This Patent Document 1 discloses an electrohydraulic excavator as an example of an electric construction machine. The electro-hydraulic excavator is driven by supplying commercial power from a switchboard or the like provided outside the vehicle body to an electric motor via a cable. Therefore, n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02F9/20
CPCH02P1/32E02F9/20E02F9/207E02F9/24
Inventor 土井哲弘滨野秀之藤田健升
Owner NIHON KENKI CO LTD