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There are several safety switches used in the belt conveyor to operate in emergency conditions. Pull Cord Switch is one of them, which operator or user can operate to stop the belt conveyor when an accident occurs.
Since the pull cord switch is a safety switch used to stop the belt conveyor, they are installed or mounted on the side of the conveyor with the pulling rope. If the length of the conveyors is too long then multiple pull cord switches are installed in a way that the pulling rope can be pulled on the conveyor at any point.
Technology parameters:
| Ambient temperature | -30ºC~ 60ºC |
| Relative humidity | 0 ~ 85% |
| Atmospheric pressure | 80 kPa ~110kPa |
| Output mode and quantity | 2×SPDT |
| Contact rating | AC380V 5A DC24V 5A |
| Action force | 70~ 100N |
| Adjustment range | 20°~ 30° |
| Limit angle | 60° |
| Reset mode | Manual |
| Protection level | IP67 |
Pull Cord Switch Principle:
The Pull Cord Switch is installed at the side of the belt conveyor and the pull cord is mounted along the conveyor. When an accident occurs in the belt conveyor, the worker can stop the belt conveyor at any position by pulling the cord in order to drive the actuating arm rotating.
The rotation may put the torsion spring in motion through the transmission shaft to drive the cam into the displacement. Then it may drive microswitches to cut down the control wiring. Thus the belt conveyor can stop operation
Operation:
The pull cord switch is mounted on each side of the belt conveyor, preferably at about a distance of 20 - 25 meters. When someone pulled the rope manually, the switch gets operated and remains in operating condition unless and until someone manually resets it to the normal position.
As these Switches are used as safety or emergency switch, it is not operated very frequently therefore construction of these switches is such that it should be operated immediately though it kept idle for a long time.
Pull cord switch is housed in a dust and weatherproof enclosure with IP65 grade of protection. A sturdy and heavy-duty cam-switch with robust contacts is used to give longer service life.
Size:
Application:
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Shipping And Payment Terms:
Delivery Time: 3-30 Days Based On Finally Order Quantities
Payment Terms: TT /L/C
Less Than 3000USD. 100% TT In Advance
More Than 3000USD, TT30% Deposite, The Balance See Copy Of B/L
Bigger Order: TT Or L/C
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