Telescopic Chute Working Principle

A telescopic chute (also known as a telescopic loading chute or telescopic discharge chute) is designed to safely and efficiently load bulk materials (such as aggregates, coal, grains, cement, etc.) into trucks, ships, stockpiles, silos, or containers while controlling dust and spillage. It works on the principle of a vertically adjustable, telescoping tube system that extends and retracts as needed, aligning precisely with the material receiving point. Our telescopic chute can be installed on stacker conveyors and mobile ship loaders for bulk material handling.

Telescopic chute for Tanker Ship Loading

Step-by-Step Working Principle

The working principle of a telescopic chute revolves around its adjustable length and controlled material discharge. Here's a step-by-step explanation of how it operates:

1. Material Feeding

Bulk material is fed into the top of the telescopic chute from a conveyor, silo, or hopper. A flow control gate or valve at the inlet regulates the discharge volume. The dischargin gate can provide a stable material flow.

2. Telescoping Extension

The chute consists of multiple concentric cylinders or bellows (usually made of metal or fabric-reinforced polymer).
A winch system, motorized hoist, or hydraulic actuator extends the chute downward toward the receiving point (e.g., a truck bed or ship hold).
Sensors or operator control ensure the chute aligns to the correct loading height, avoiding excessive fall height that causes dust and segregation.
For example, when loading a truck, the chute extends close to the truck bed to reduce the drop distance, then retracts as the truck fills up.

3. Controlled Material Flow & Dust Suppression

As material flows down through the extended chute, internal flow guide cones ensure smooth, centered flow to prevent clogging or splashing.
Most systems feature integrated dust extraction units or dust skirts that capture or suppress dust during loading.
Flexible outlet skirts or sealing cones make contact with the receiving surface to enclose the material flow path.

4.Positioning and Movement

The chute is often mounted on a swivel, pivot, or rotating base, enabling it to move horizontally or vertically. This flexibility ensures precise placement over the target area, such as aligning with a truck hatch or distributing material evenly in a stockpile.

5. Retraction After Loading

Once the receiving container is full or the loading cycle ends, the chute retracts automatically or manually to its compact position.
Proximity sensors, level detectors, or operator feedback can trigger retraction.

Telescopic Chute for Quarry Yard

Operational Process of Telescopic Chute

Here's how a telescopic chute typically works during a loading operation:

Setup: The chute is positioned over the receiving area (e.g., a truck or stockpile) and extended to its starting position, often near the bottom of the container to limit dust and material segregation.
Material Release: The discharge gate opens, allowing material to flow through the chute in a controlled manner.
Adjustment: As the container fills, the chute gradually retracts—either manually or via automation—keeping the discharge point just above the rising material level.
Completion: When the loading is finished, the gate closes, and the chute retracts fully to its resting position.

For stockpiling in the yard, the chute might also rotate or move in a circular pattern to create an even, uniform pile. Our telescopic chutes are widely used in quarries to minimize dust.

Telescopic Chute with Rubber Dust Control Curtain

Applications of Telescopic Chute

Truck loading (open top or tanker) and railcar loading.
Barge and ship loading (when paired with mobile ship loaders).
Silo discharge into containers or hoppers.
Stockpiling in warehouses or open yards like mine, quarries, port yard, etc.

Telescopic Chute for High Throughput Like Ship Loading

A telescopic chute works by extending and retracting its sections to control the discharge height, regulating material flow with a gate or valve, and incorporating dust control and positioning features. This ensures efficient, clean, and safe handling of bulk materials across various industries. Would you like a diagram or a specific recommendation (e.g., fabric vs. steel telescopic chute) for your material and loading height?