A manual control device for coal sampling collection system

Abstract

The invention provides a manual control device for a coal transporting sampling collection system. The manual control device comprises a time relay, a button switch, an intermediate relay, an alternating current contactor and a collector proximity switch. The power supply of the time relay is from the collector proximity switch. The delay auxiliary contact of the time relay is connected with a coil of the intermediate relay in series. The normally-closed contact of the intermediate relay is connected with a coil of the alternating current contactor; a contact of the alternating current contactor is connected with the button switch and switches on a rotary disc driving motor power source. Through modification of the conventional coal transporting sampling collection system control circuit, the prolonging function of the time relay is adopted and the time relay is connected between the collector proximity switch and the intermediate relay, so that a delay effect on the collector proximity switch is achieved. Further, the problem that the collection system cannot work continuously during manual operation is solved. The manual control device is simple to install, low in cost and great in controllability.

Description

technical field [0001] The invention relates to a control system, in particular to a manual control device for a coal sampling collection system. Background technique [0002] The sampling system in the middle of coal handling in power plants includes sampling, feeding, collecting, bucket lifting and returning materials and other devices. The function of the collector is to collect the coal samples automatically collected intermittently by the coal conveyor belt into the sample coal barrels, and change the sample barrels once in a shift (8 hours), and the three barrels are automatically rotated by the PLC through the turntable and the proximity switch. The control part adopts the combination of PLC automatic control and manual control to operate, but the manual control part of the collector has the following problems: after switching to manual operation, the turntable can only rotate one-third of the turn after starting and then automatically stops, and the second round cann...

AI Technical Summary

Problems solved by technology

The control part adopts the combination of PLC automatic control and manual control to operate, but the manual control part of the collector has the following problems: after switching to manual operation, the turntable can only rotate one-third of the turn after starting and then automatically stops, and the second round cannot be performed. To run, debug and reset, it is necessary to switch to automatic operation or manually rotate the motor once, so that the proximity switch exits the working state, and then restarts for the second round of work, which wastes manpower and reduces operating efficiency

[0003] However, the existing manual control devices of other collection systems have problems such as complex structure and inconvenient operation. For example, Gou Xiaowei published on August 1, 2010 "Reconstruction of the Control System of Furnace Coal Sampling Device Based on PLC and Touch Screen Technology" , the system control functions include stop mode, remote control mode, local automatic control mode and local manual control mode.

In the manual mode on site, the operator needs to manually operate each device on site, and its control system has a complex structure

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