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Hybrid operation machine

A working machine, hybrid technology, applied in mechanical equipment, liquid variable capacity machines, elevators, etc., can solve the problems of DC bus damage, buck-boost converter damage, etc., and achieve the effect of improving reliability and suppressing damage.

Inactive Publication Date: 2011-07-27
SUMITOMO HEAVY IND LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, when an abnormality such as a disconnection occurs in the buck-boost converter or the DC bus, when the lifting electromagnet is demagnetized (released), a large regenerative power is suddenly supplied to the DC bus, so DC may be generated. Damage to the bus or damage to the buck-boost converter

Method used

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Embodiment Construction

[0074] Hereinafter, an embodiment of a hybrid working machine using the present invention will be described.

[0075] figure 1 It is a side view showing a construction machine including the hybrid working machine of the present embodiment.

[0076] A revolving upper body 3 is mounted on an undercarriage 1 of this hybrid working machine via a revolving mechanism 2 . In addition, on the upper revolving body 3, in addition to the boom 4, the arm 5, and the lifting electromagnet 6, and the boom cylinder 7, the arm cylinder 8, and the bucket cylinder 9 for hydraulically driving them, a Cockpit 10 and power source.

[0077] [overall composition]

[0078] figure 2 It is a block diagram showing the configuration of the hybrid working machine of the present embodiment. in the figure 2 In , the mechanical power system is represented by a double line, the high-pressure hydraulic line is represented by a thick solid line, the pilot line is represented by a dotted line, and the elect...

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Abstract

The invention relates to a hybrid operation machine, which is used for limiting the demagnetizing action of a lifting electromagnet when a direct current (DC) bus or a step-up and step-down converter is abnormal so as to inhibit the damage of the DC bus or the step-up and step-down converter and improve reliability. The hybrid operation machine is an operation machine comprising a motor-driven electric operation unit and the lifting electromagnet, and comprises an electric accumulator, the DC bus, the step-up and step-down converter, a drive control part and an abnormal detection part, wherein electric power is provided and received between the electric operation unit and the lifting electromagnet by the electric accumulator; the DC bus is connected between the electric operation unit and the lifting electromagnet; the step-up and step-down converter is arranged between the DC bus and the electric accumulator; the drive control part is used for the drive control of the lifting electromagnet; the abnormal detection part detects the abnormality of the electric accumulator, the DC bus or the step-up and step-down converter; and when the abnormal detection part detects the abnormality, the drive control part limits the demagnetizing action of the lifting electromagnet.

Description

technical field [0001] The present invention relates to a hybrid working machine using a buck-boost converter that controls the power supply to a lifting solenoid or other electric working units, and Controls the supply of regenerative power obtained by the work unit to the storage battery. Background technique [0002] Conventionally, a hybrid work machine in which a part of the drive machine is electrified has been proposed. This type of construction machine is equipped with a hydraulic pump for hydraulically driving working units such as booms, arms, and buckets. The engine used to drive the hydraulic pump is connected to a motor generator through a speed increaser, and the motor generator assists the motor. drive, while charging the electric power obtained through power generation into the accumulator. [0003] In addition, as a power source of the swing mechanism for turning the upper swing body, an electric motor is provided in addition to the hydraulic motor, and th...

Claims

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Application Information

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IPC IPC(8): E02F9/20E02F9/22F04B49/00B66B1/06
Inventor 神林英明佐野公则
Owner SUMITOMO HEAVY IND LTD
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