The electrical part of the steel plate pretreatment line adopts three-phase four wire power supply mode, the main circuit adopts ~ 380V, the control line adopts ~ 220V transformer isolation control, the whole line adopts PLC machine for the whole process control, the whole machine is divided into manual and automatic working modes. Each motor is equipped with short circuit and overload protection. Test the operation of the pellet circulation system and check the operation at any time to prevent the pellet from blocking. In case of any fault, alarm at any time and cut off the ammunition supply circuit to prevent the accident from expanding. Emergency stop switch shall be set in each operation site to ensure the safety of equipment and personnel.
II. Electrical layout
The control system is composed of four low-voltage distribution boards, two PC cabinets, a main console and three field operation stations.
The shaft end of each cycle system is equipped with proximity sensor, which is used for operation detection and fault self inspection and prompt. The photoelectric switch is installed in the cleaning device, and the closing switch at the end of the roller lifting shaft can be used to control and clean various workpieces. The access door is equipped with a travel switch for easy safety maintenance. A limit switch is installed on the end cover of each shot blasting machine to ensure the safety of personnel and equipment. A roller travel switch is installed at the entrance of the feed roller table and the cavity, and the proximity sensors at both ends of the middle roller table cooperate to automatically calculate the position of the workpiece and switch the shot blasting door. The roller travel switch is installed at the outlet of the outlet roller table and the cavity. When the workpiece leaves the chamber, the pressing roller can automatically open the conveying roller table. After the workpiece leaves the roller table, the conveying roller table can be automatically closed at a certain time. The cleaning chamber is equipped with 8 travel switches to detect the positions of the lifting ends of the shot blaster and the roller brush. When the limit position at both ends does not work, the limit position at both ends plays an important role, and the alarm prompt can repair or replace the limit position at both ends in time. In the spray booth, proximity sensors are installed at the lifting position and the extreme position of the left and right moving positions of the two guns to ensure the correctness and reliability of the spray guns. The photoelectric altimeter shall be installed in front of the spray booth to ensure that the spray gun can spray the workpiece at a proper height. The slide governor controls the roll speed. The whole working process is displayed by analog screen, which can not only display the operation of each motor, but also display the action of each limit switch and proximity switch, as well as fault alarm, maintenance and overload.
III. operation instructions
(I) inching operation:
PGL cabinet has four black click buttons. This function is provided to facilitate the adjustment of the corresponding operation parts and equipment maintenance work.
Manual operation:
Turn on the power
Turn the key button to connect and press the power control button.
Turn the manual / auto switch to the manual switch.
Press the PC power button.
The operation of each part during manual operation.
The shutdown sequence is the reverse of the startup sequence.
Automatic operation
Power on:
Turn off the main power switch and each individual switch and connect the air source.
Switch the "manual / automatic" change-over switch to the "automatic" side.
Turn off the button, press the button, in "about control".
Press the PC power button.
Press the button to start the motor automatically (PC in running state, PC in stop state). The engine will start before the preparatory work is complete.
(Note: General operating table steps 1-5)
After the preparation operation, select the 1H manual box "plate / profile / component" switch plate to the corresponding position according to the workpiece type.
Place the workpiece on the feeding roller table (the workpiece cannot be pressed on the width measuring roller table), press the "prepare to complete" button, the "prepare to complete" light will be on, press the "automatic feeding" button, the material will be delivered, and the production line will enter the automatic operation state.
Shutdown:
After shutdown, clean and spray dry all workpieces.
By pressing the "auto stop" button on the main console, the motors that are turned on before the preparatory action is completed will turn off in reverse order (see "auto stop" below). After the dust removal fan is shut down, the rotating jet and the back blowing motor are started at the same time, and they stop running after three minutes.
End of automatic operation process
Power off button.
Disconnect the key button.
Disconnect the main power switch.
IV. function introduction
(I) preparation
Before starting, click the manual alarm button to remind the staff in place of the safe operation of the equipment.
Auto: after pressing the "auto start" button, each motor and solenoid valve will start in the following order:
Set the upper limit of the workpiece, take up the screw rod, roller brush, spray gun, etc., and return the height measuring device to its original position. (lower limit)
Start the dust remover and main fan.
The shot blasting fan is started.
Paint mist dedusting fan on
Preheating room fan on
Drying room fan on
Preheating chamber 1-3 heater
Heater in? III drying room
Separator motor starts.
Hoist motor starts.
The transverse auger motor starts.
Longitudinal screw motor starts.
1.2 shot blasting machine motor starts.
Fire 3,4 motor start.
5. No. 6 shot blasting machine motor starts.
Middle roll motor on (pay attention to speed adjustment)
Drive the plate chain motor (pay attention to speed adjustment).
After the preparatory work is completed, press this button, and after the preparatory work is completed, the lamp will be on after the preparatory work is completed.
(II) cleaning and painting
Place the workpiece in the proper position of the feeding roller table, press the automatic feeding button, the feeding roller table motor starts (pay attention to adjust the speed), and after the workpiece leaves the pressing roller, the feeding roller table automatically stops to prepare for the next feeding.
Enter the preheating room for work and clean up the preheating work.
After pressing the workpiece and sending it to the limit position of the pressure roller, count it to the shot blasting position by cooperating with the proximity switch of the middle roller table, automatically open the shot blasting doors 1 to 6, and pay attention to the observation of shot blasting current.
When the workpiece reaches the cleaning position, the photoelectric switch, coil and the altimeter with the closing roller brush downward are used to measure the position after the sedimentation rotation and the automatic opening and closing of the ball roller brush motor.
After the workpiece leaves the limit position of the feeding pressure roller, it will cooperate with the proximity switch of the middle roller table again, count to the shot blasting position, and then automatically close the No. 1-6 supply door.
When the workpiece reaches the position of the spray gun, the light curtain of the photoelectric switch is blocked, proving the existence of the workpiece, and the spray gun begins to paint. When the workpiece moves out of the coating position, the photoelectric switch is unblocked and the coating stops.
The workpiece is taken to the drying chamber and the spray paint is dried.
If there is no material in the upper area of the paper feed roller when the workpiece unloading line pushes the pressure component to the pressure roller and the feed roller stops automatically opening, the material will continue automatically and open automatically when it is closed if there is no material in a certain period of time.
If the workpiece changes, please reset the workpiece and adjust the height of roller brush, pill collecting screw and spray gun. The workpiece works automatically in steps 19-24.
Manual: the manual operation sequence can be operated according to the automatic operation sequence.
(III) automatic stop
Press the automatic stop button and make sure that there is no workpiece on the roller table.
Pill and auto off switch and turn on the roller output screw and spray gun to the upper limit of roller. The sequence of each step in preparations 2 to 17 will be stopped in reverse order, wherein the blower wheel motor will be close together, the preheating chamber will be closed together with the fan drying chamber, and must be closed before the preheating chamber and the heater in the drying chamber can be closed to turn off the ventilator.
The function of width measuring roller
When the workpiece is pressed on the width measuring roller, the corresponding shot supply door (width measuring roller I corresponds to No. 1 and No. 2 shot supply doors, width measuring roller II corresponds to No. 3 and No. 4 shot supply doors, width measuring roller IV corresponds to No. 5 and No. 6 shot supply doors).
Measurement of rotational speed of pill circulation system
Separator, elevator, horizontal screw conveyor and vertical screw conveyor form a bullet circulation system. When one of them is not working normally (such as being stuck by bullet, elevator belt is broken), the system will shut down automatically and the equipment will give an alarm. At this time, press the emergency stop button to close immediately.
Vi. alarm reset
When the alarm rings, press the "reset alarm" button on the main operating table to stop the alarm.
