Phisher | Two-Way Pull Cord Switch

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Two-Way Pull Cord Switch

The two-way pull-rope switch is an essential protective device for belt conveyors. The two-way pull-rope switch is installed on both sides of the belt conveyor and connected with a wire rope. When an emergency occurs in the conveyor belt equipment, the wire rope is pulled at any point along the line. The wire rope drives the drive arm to rotate, and the torsion spring is driven through the transmission shaft to displace the precision cam, drive the micro switch to cut off the control line, and the conveyor stops running.

Fischer’s two-way pull-rope switch adopts the internationally leading double-bearing transmission structure to avoid the transmission shaft directly rubbing against the housing or sleeve when the pull-rope switch is switched, causing the gap to increase, resulting in poor sealing or jamming, greatly extending the service life of the pull-rope switch; the housing surface is finely painted, not easy to fall off and has no odor; the transmission shaft is made of stainless steel with high strength and smooth surface; the operating rod is precision-cast to avoid welding, with a built-in copper bushing, and the overall smoothness and high strength. This pull-rope switch has the characteristics of long life, flexibility and practicality, safety and reliability, and easy maintenance. When the maintenance personnel have not evacuated or there are other abnormal conditions, as long as the pull rope switch is locked in the stop position, there is no need to worry about the belt conveyor being started by mistake, and the safety of the maintenance personnel is guaranteed.

Basic parameters of the two-way pull rope switch:

Protection level : IP67
Shell material : Aluminum alloy surface fine paint
Transmission rod material : Stainless steel
Required cable tension : 49±10N (5±1kgf)
Number of contacts : 2
capacity : 250V AC 5A
Wiring port : 6~12mm cable
Applicable temperature : -20℃~+60℃
Service life : 500,000 times
BRAND : FISCHER TECHNOLOGY 

installation method:

The two-way pull rope switch should be installed in places with maintenance channels on both sides of the conveyor, and the installation position should ensure that the maintenance personnel can operate conveniently in an emergency.
1. Fix the two-way switch on the frame.
2. The distance between the two two-way pull rope switches on one side is about 50m, and they are connected by a steel wire rope with a diameter of Φ4, and the tightness should be moderate.
3. To reduce the effect of the deadweight of the wire rope on the activation of the pull rope switch, install a support ring on the frame every 3m to support the wire rope.
4. The other end of the wire rope is tied to the tension spring (fixed with a rope buckle). Use a tensioner to tighten the pull ropes on both sides without affecting normal use, and ensure that the tension on both sides is balanced.

(Note: For conveyors in climbing sections, the distance between pull rope switches and the length of pull ropes should be shortened as much as possible.)