Controllable start and brake method of swing mechanism of stacker-reclaimer
A technology of slewing mechanism and starting method, which is applied to motor generator/starter, motor control in four-quadrant, starter of single polyphase induction motor, etc. Work and other problems to achieve the effect of eliminating the impact
Inactive Publication Date: 2006-09-13
SHENYANG MINING MACHINERY GROUP
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Problems solved by technology
Traditional control generally adopts the method of step-by-step speed regulation, which cannot realize the continuous adjustment of the slewing speed in the true sense, and there is an obvious impact on the equipment during the starting and braking process. In recent years, with the development of frequency conversion technology, frequency conversion speed regulation has also It is applied to the cantilever rotation process of the stacker-reclaimer, but due to the large moment of inertia during the cantilever rotation starting and braking process, the motor is often in the power generation feedback state, so that the DC bus voltage of the frequency converter rises and is in failure status and not working
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[0014] The system is mainly composed of the following three parts,
[0015] A power supply unit
[0016] For the power supply part of the whole device, the incoming power supply is three-phase AC 380V, the outgoing line is AC 380V power supply for the frequency conversion device and AC 220V power supply for the logic control device and braking device.
[0017] Two logic control devices
[0018] The command sending and receiving part of the whole device, the starting and braking commands of the equipment are all issued by the logic control device, the ready and fault signals of the whole device are received by the logic control device, and the next action command ( figure 2 for the control flow chart)
[0019] Three frequency conversion device and braking device
[0020] The core part of the whole device, the frequency conversion device rectifies the AC power obtained from the power supply device into DC power first, then modulates and divides the frequency, and finally bec...
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This invention provides a method for controlled starting and braking of a turning unit of a stacking-fetching machine, including improving the starting property of the frequency converter to a curve slope of a S shape in the process of starting, in which, the braking method includes: 1, configuring a braking unit for the converter, 2, injecting DC for the turning unit to drive the motor in the process of braking to increase the brake torque of the turning unit for driving the motor, which not only realizes the continuous adjustment of the turning speed of the cantilever but also at very stable state in the starting and braking.
Description
technical field [0001] The invention relates to a controllable starting and braking method of a turning mechanism of a stacker-reclaimer. Background technique [0002] The cantilever rotation of the stacker-reclaimer is a device with a large moment of inertia when starting and braking. During the starting and braking process of the cantilever, it needs a high response time and relatively stable response characteristics, and some stackers The material machine requires that the rotation speed is automatically and continuously adjustable during the cantilever rotation process. Traditional control generally adopts the method of step-by-step speed regulation, which cannot realize the continuous adjustment of the slewing speed in the true sense, and there is an obvious impact on the equipment during the starting and braking process. In recent years, with the development of frequency conversion technology, frequency conversion speed regulation has also It is applied to the cantile...
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IPC IPC(8): H02P1/30H02P3/22H02P3/24H02P23/06
Inventor 艾英明
Owner SHENYANG MINING MACHINERY GROUP