Braking device and braking method for vibrating screen motor of asphalt mixing plant
A technology of motor braking and vibrating screen, which is applied in the direction of AC motor deceleration device, electric motor/converter plug, etc., can solve the problems of prolonged downtime of vibrating screen, shortening service life of vibrating screen, and unstable shutdown process, etc., to achieve Effect of elimination of resonance phenomenon, shortening of downtime, reduction of downtime
Active Publication Date: 2016-08-17
XUZHOU XCMG MAINTENANCE MACHINERY CO LTD
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Problems solved by technology
During the free shutdown process of the vibrating screen of the asphalt mixing plant directly cutting off the power supply, due to the resonance effect of the vibrating screen, the shutdown process is unstable, and the amplitude of the resonance increases, which even causes the main building to shake, shortens the service life of the vibrating screen, and causes hot bones on the main building. Hazards such as cracking of the silo and deformation of the main building support; at the same time, the downtime of the vibrating screen is prolonged, and the waiting time for restarting the equipment is longer
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[0024] Such as figure 1 As shown, the braking device of the vibrating screen motor of the asphalt mixing plant based on time control includes a circuit breaker, a contactor, a signal source, and a timing controller; the signal source provides the running signal and braking signal of the vibrating screen motor; the contactor includes a running contactor and Braking contactor; the timing controller selects to turn on or off the running contactor or braking contactor after receiving the control signal from the signal source, and the circuit breaker is connected to the running contactor and braking contactor respectively. Starting, running and braking play a protective role. The running contactor and braking contactor provide normal running power and reverse braking power for the vibrating screen motor respectively.
[0025] The timing controller is the core of the whole device, and its main functions are reverse braking start timing, braking operation timing, and connecting and ...
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The invention belongs to the field for a motor brake technology, and particularly relates to the field of a brake technology which is applied to a vibratory screen motor of an asphalt concrete stirring apparatus. According to the characteristics of the vibratory screen of an asphalt mixing station, a timing controller is utilized for accurate control over the time of connection with a reverse phase sequence power supply and the time of reversal connection brake, and a brake power supply is connected or removed based on the time. Compared to the prior art, the brake device and the brake method provided by the invention can eliminate the resonance vibration during the shutdown process of the vibratory screen, the stable shutdown of the vibratory screen and a main building apparatus can be realized, the service life of the vibratory screen and the main building apparatus is prolonged, and the shutdown time is reduced by over 60%, thus the apparatus can be put into production again, and the production efficiency is improved.
Description
technical field [0001] The invention belongs to the technical field of motor braking, in particular to the technical field of braking applicable to vibrating screen motors of asphalt concrete mixing equipment. Background technique [0002] The vibrating screen is a fine screening device for asphalt mixing equipment, driven by a three-phase asynchronous motor, its operation and braking performance directly affect the quality of the entire asphalt mixing equipment. During the free shutdown process of the vibrating screen of the asphalt mixing plant directly cutting off the power supply, due to the resonance effect of the vibrating screen, the shutdown process is unstable, and the amplitude of the resonance increases, which even causes the main building to shake, shortens the service life of the vibrating screen, and causes hot bones on the main building. Hazards such as cracking of the silo and deformation of the support of the main building; at the same time, the downtime of ...
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IPC IPC(8): H02P3/20
Inventor 李明超李灿韩尤舜李家春韩金枝许向民郭柏甫丛日霞党晨源
Owner XUZHOU XCMG MAINTENANCE MACHINERY CO LTD