1. Status switch
The status switch is used as the execution part and the information feedback part of the stacker. The quality of the status switch directly affects the normal operation of the stacker. The status switch includes the left middle position, the right middle position, the left end position and the right end. Switches such as position, lift address recognition, lift alignment, speed change, walking address recognition, stock availability, cargo detection, etc., as the execution part, while executing instructions, it also feeds back the execution progress to the PLC in real time for analysis by the PLC. Issue appropriate instructions.
2. Protection switch
The protection switch is used as the protection part of the stacker. The quality of the protection switch affects whether the stacker can operate safely within the controllable range. The protection switch includes fork over, cargo over, limit, loose For switches such as ropes and stalls, the stacker can be controlled to operate within a controllable range only when the protection switch is in good condition, so as to avoid unnecessary loss of property and personnel due to the loss of control of the stacker.
1. Schematic diagram of switch installation The following figure shows the installation diagram of partial state switches and protection switches:
Switch and device function description
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Serial number
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Device name
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Device type
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Device model
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Function Description
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1
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Upper and lower limit
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Automatic stop device for upper and lower limit
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Photoelectric switch
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When the cargo platform exceeds the upper limit or lower limit of the working stroke during the lifting process, the main circuit contactor is automatically cut off, and the lifting frequency converter and the lifting motor are forcibly cut off.
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2
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Inside and outside limit
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Automatic stop device for inside and outside limit
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Limit switch
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When the cargo platform exceeds the limit position of the inner or outer limit of the working stroke during the traveling, the main circuit contactor is automatically cut off, and the traveling inverter and traveling motor are forcibly cut off.
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3
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Loose rope overload
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Overweight protection device
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Limit switch
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When the chain or wire rope of the stacker loading platform is loose, or the stacker loading platform is overweight, the main circuit contactor is automatically cut off.
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4
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Elevator stall
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Stall protection device
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Proximity switch
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When the chain or wire rope of the loading platform breaks, or the loading platform is stuck on the shelf, the loading platform slides down at a high speed and automatically cuts off the main circuit contactor.
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5
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Fork over protection
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Fork protection device
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Photoelectric switch
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If the left or right side of the stacker fork exceeds, the stacker PLC does not give output and the motor stops rotating.
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6
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Cargo protection
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Cargo protection device
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Photoelectric switch
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If the left or right side of the stacker cargo exceeds, the stacker PLC will not give output and the motor will stop rotating.
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7
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Cargo Detector Switch
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Cargo check device
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Photoelectric switch
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In the case of warehousing, if there are already stocks at the destination address, it will be notified that there are stocks, and the alarm will be “double warehousing” to avoid collision.
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8
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Change speed
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Automatic speed reduction device at the end of lifting
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Photoelectric switch
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During the lifting and lowering process of the cargo platform, if the low-end or high-end speed changing device of the column is located, the high-speed is automatically turned off and the low-speed is connected to prevent the lifting and over-limit device from being exceeded at high speed.
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9
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Speed change
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Automatic speed reduction at the end of walking
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Photoelectric switch
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During the traveling of the cargo platform, if the speed changing device is at the inner or outer end of the traveling, the high-speed is automatically turned off and the low-speed is connected to prevent the traveling overrun device from being exceeded at high speed.
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10
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Fork change speed
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Change speed from high speed to low speed
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PLC program
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When the fork is extended to the end or neutral position, the program automatically changes the high speed to low speed operation to prevent the cargo from collapsing due to inertial impact.
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11
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End switch
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Fork end stop device
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Photoelectric switch
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When the fork extends to the end position, the power supply of the fork inverter and the fork motor is automatically cut off.
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12
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Neutral switch
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Fork center stop device
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Photoelectric switch
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When the fork returns to the neutral position, the power supply of the fork inverter and the fork motor is automatically cut off.
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13
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Lift address
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Lifting address recognition device
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Photoelectric switch
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During the automatic lifting process of the stacker, it is used to memorize and judge which layer is currently located.
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14
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Lift stop
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Lift stop device
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Photoelectric switch
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When the stacker reaches the target floor, the lifting stop device will automatically stop when it is judged to be in a low or high position.
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15
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In stock switch
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Checking device for goods on loading platform
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Photoelectric switch
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It is mainly used to detect whether there is goods on the loading platform. During the pickup operation, if the pickup process is completed and no goods are detected, the alarm will be “empty pickup”.
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16
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Way of working
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Mode interlocking device
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Way button
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Only one of the four modes of online, stand-alone, manual, and overhaul can be selected.
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17
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Address exceeds
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Automatic job address overrun detection
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PLC program
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If the address received by the stacker does not match the actual address during operation, the PLC will not act.
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