Quick following control method for lifting motor and opening and closing motor of grabbing crane

A lifting motor and follow-up control technology, applied in the direction of load hanging components, transportation and packaging, etc., can solve the problem of unfavorable and safe operation of the opening and closing motor

Active Publication Date: 2012-06-20
HENAN WEIHUA HEAVY MACHINE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a fast following control method for the lifting motor and the opening and closing motor of the grab crane, which is used to solve the problem that the opening and closing motor in the prior art is in an overload state during the lifting process, which is not conducive to safe operation

Method used

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  • Quick following control method for lifting motor and opening and closing motor of grabbing crane
  • Quick following control method for lifting motor and opening and closing motor of grabbing crane

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Embodiment Construction

[0009] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0010] The details of the feeding and discharging process of the grab bucket are as follows:

[0011] 1) When the grab bucket descends to the material surface, the pull rope of the opening and closing motor is tightened, and the grab is closed to grab the material. At this time, the opening and closing motor is in the speed control mode; the lifting motor is closed, but its brake is opened. As the material increases, The lifting rope descends with the gravity, and the grab automatically grabs the material under the action of gravity.

[0012] 2) When the material is fully grasped and the grab is closed, the lifting process starts. At this time, due to the slackness of the lifting motor rope, the lifting motor works in the speed control mode of constant speed, and the lifting motor quickly accelerates to the set speed. The set speed should be as large as poss...

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PUM

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Abstract

The invention relates to a quick following control method for a lifting motor and an opening and closing motor of a grabbing crane. The quick following control method includes steps that when a grab bucket fully grabs materials and is closed, the opening and closing motor is switched to a torque control mode with fixed torque so as to run in a deceleration manner at the set torque; simultaneously, the lifting motor works in a speed control mode with fixed rotation speed and is driven to accelerate to set speed; and when the running distance of a draw cord of the lifting motor is equal to that of a draw cord of the opening and closing motor, the opening and closing motor is switched to a speed control mode, and the lifting motor is switched to a torque control mode so as to follow the torque of the opening and closing motor. The working modes of the opening and closing motor and the lifting motor are controlled, accordingly, when the draw cord of the lifting motor is tensioned straightly to carry load, the opening and closing motor is in a torque limit state, overload of the opening and closing motor is avoided assuredly, the opening and closing motor is driven to run in the deceleration manner, and simultaneously, the lifting motor is in a quick acceleration state until the running distances of the two motors are identical.

Description

technical field [0001] The invention relates to a grab crane, in particular to a balanced control system and method for preventing overload of a switch motor. Background technique [0002] With the continuous popularization of frequency conversion technology, its various advantages have been gradually recognized by everyone, so frequency conversion control has also been applied to grab cranes in recent years. But there is a problem in use, that is, because the working efficiency of the grab crane is relatively high, after the material is grabbed in the past operation, the opening and closing motor will be stopped, and then the two handles will work together, which will greatly improve the efficiency. Therefore, in many cases, after the opening and closing mechanism of the grab completes the grabbing work, it does not stop, and directly starts the lifting motor to improve efficiency. [0003] However, in the existing control method, the switching motor and its mechanical tra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B66C13/22B66C3/18
Inventor 周强张书霞刘光辉陈坦
Owner HENAN WEIHUA HEAVY MACHINE
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