Question

The reverse direction rotation of Belt conveyor can be prevented by

• A. Hold back
• B. Stop back
• C. Back stay
• D. Pull chord

Hint:

The name "holdback" perfectly describes its function: it holds the belt back from running in reverse.
It's a mandatory safety feature for any inclined conveyor system.

Answer 1

The Correct Option is A

Step 1: Understanding the Question:
We need to identify the safety device used to prevent an inclined belt conveyor from running backwards under the weight of its load if the power fails.

Step 2: Detailed Explanation:
When a loaded belt conveyor is operating on an incline, the material on the belt exerts a gravitational pull that tries to make the belt run backwards.
If the drive motor stops for any reason (e.g., power failure), this gravitational force will cause the belt to accelerate in reverse, which is an extremely dangerous situation.
To prevent this, a mechanical safety device is installed on the drive pulley shaft.
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Holdback (or Backstop): This is the correct term for this device.
It is a type of one-way clutch or ratchet mechanism.
It allows the drive shaft to rotate freely in the forward (operating) direction but instantly engages and locks if the shaft attempts to rotate in the reverse direction, thus "holding back" the conveyor.
-

Back stay: This is a device for rope haulage tubs, not belt conveyors.
-

Pull chord: This is an emergency stop system that runs along the length of the conveyor, allowing it to be stopped from any point.
It does not prevent reverse motion.

Step 3: Final Answer:
The reverse rotation of a belt conveyor can be prevented by a holdback.
This corresponds to option (A).