A Soft Start Control System for High Voltage and High Power Electric Hydraulic Excavator

A technology of hydraulic excavator and control system, applied in the direction of earth mover/shovel, construction, etc., can solve the problems of large starting torque shock, large starting current, affecting the power grid, etc.

Active Publication Date: 2021-02-23
XUZHOU XCMG MINING MACHINERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional electro-hydraulic excavators generally adopt the control method of direct full-voltage starting of three-phase asynchronous motors. The starting equipment is simple, but there are disadvantages such as large starting current, large starting torque impact, and easy to cause shock fluctuations in the power grid. Coupling transformer starting and other step-down measures, the effect is still unsatisfactory
In particular, the start-up problem of large electro-hydraulic excavators for mines with high-power high-voltage motors is particularly prominent. There are problems such as failure to start normally in a complex power grid environment, fragile motor shaft load connection devices, and affecting the normal operation of other power grid equipment, which is not conducive to the system. Power Regulation and Efficiency Improvement
[0003] With the rapid development of high-power power electronic devices, the soft-start device designed based on the thyristor three-phase AC voltage regulation circuit can realize the soft start of the motor without impact, and has a strong ability to resist power grid fluctuations, which can effectively prolong the life of the motor and machinery, and greatly improve the system performance. Starting efficiency and reliability, but because of its large size, the electro-hydraulic excavator has limited space on board, and there are many inconveniences in installation and maintenance

Method used

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  • A Soft Start Control System for High Voltage and High Power Electric Hydraulic Excavator

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Embodiment Construction

[0018] In order to deepen the understanding of the present invention, the present invention will be described in detail below in conjunction with the accompanying drawings.

[0019] Such as figure 1 As shown, a high-voltage and high-power electric hydraulic excavator soft-start control system includes integrated cables, soft-start devices, slip ring boxes, main control units, motors, man-machine interfaces, GPS devices and remote control centers, and soft-start devices Installed above the tail bracket of the excavator, the integrated cable leading from the external high-voltage power supply 10 (6) kV is connected to the input terminal of the slip ring box through the soft starter device, and the output terminal of the slip ring box is connected to the main control unit. The unit is connected with the motor and regulates the motor. The output shaft of the motor is mechanically connected with the hydraulic pump through the transfer case. The main control unit can also communicat...

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Abstract

The invention relates to a soft start control system for a high-voltage and high-power electric hydraulic excavator. The soft starter is connected to the slip ring box and then to the main control unit, the main control unit is connected to the motor, the output shaft of the motor is connected to the hydraulic pump, the main control unit is connected to the soft starter through the slip ring box through an integrated cable, and the main control unit is also It is connected and communicated with the man-machine interface and the GPS device, and the GPS device communicates with the remote control center wirelessly. The soft start control system of the high-voltage and high-power electric hydraulic excavator provided by the present invention is applied to the 6kV / 10kV level, has the characteristics of strong power grid adaptability, small starting current, and diversified starting methods, and realizes the smooth start of the high-voltage motor without impact, Significantly save the boarding space, and can realize the transmission of high-voltage electric energy and CAN signal and remote data transmission.

Description

technical field [0001] The invention belongs to the technical field of construction machinery and is suitable for electric hydraulic excavators powered by grid electric energy, in particular to a soft start control system for high-voltage and high-power electric hydraulic excavators. Background technique [0002] With the increasing emphasis on environmental protection and the improvement of power sources in recent years, electric hydraulic excavators using electric motors to drive hydraulic systems have gradually become a new research direction and hot spot in the field of excavators. Traditional electro-hydraulic excavators generally adopt the control method of direct full-voltage starting of three-phase asynchronous motors. The starting equipment is simple, but there are disadvantages such as large starting current, large starting torque impact, and easy to cause shock fluctuations in the power grid. Coupling transformer starting and other step-down measures, the effect i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02F9/20E02F9/22
CPCE02F9/2075E02F9/2246
Inventor 王峰秦家升杨裕丰丁跃进王勇高达汪允显李志鹏石立京张培林蒋可
Owner XUZHOU XCMG MINING MACHINERY CO LTD
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