Steps and Safety Measures for the Recovery of Scraper Conveyors

The recovery and dismantling of a scraper conveyor require a systematic approach to ensure safety and efficiency. This guide outlines the sequential steps, dismantling techniques, loading procedures, and essential safety precautions to minimize risks during the operation.

1. Sequence of Recovery Operations

The recovery of a scraper conveyor follows a structured order to ensure smooth and efficient dismantling. The recommended sequence is:

1. Scrapers and Chains: Remove scrapers and scraper chains first.
2. Tail Section and Drive Components: Dismantle the tail section and its associated drive components, including cooling water pipes and cables.
3. Head Section and Drive Components: Remove the head section and its drive components.
4. Curved Transition Section: Dismantle the curved transition trough at the head.
5. Middle Trough and Cable Trough: Finally, recover the middle trough and cable trough sections.

2. Dismantling, Loading, and Binding Procedures

2.1 Dismantling the Scraper Conveyor

1. Power Isolation:
   • Ensure the equipment is de-energized and locked out before beginning any dismantling work.
   • At the transition trough near the head section, cut the scraper chain and lock the head motor.
2. Scraper Chain Removal:
   • Use the motor at the tail end to drive the chain forward, gradually discharging the entire scraper chain from the trough.
   • Manually pull the discharged chain to the coal wall side, divide it into sections, and transport it out using mine carts.
3. Tail Section Dismantling:
   • After removing the tail section, use the ventilation roadway winch to drag it beneath a hoisting device.
   • Disassemble the tail drive components for individual loading.
   • Secure each component with chains before raising them to a sufficient height, allowing flatbed carts to be positioned underneath for loading.
4. Binding Requirements:
   • Use at least six binding points per cart, with no fewer than six strands of #8 wire for each point.
   • First, secure the corners with #8 wire, then use two 18.5 mm steel cables and turnbuckles to cross-bind the equipment diagonally.

2.2 Transition Trough Dismantling

• Pull the head transition trough and two adjacent middle trough sections to the ventilation roadway for loading.

2.3 Middle Trough and Cable Trough Dismantling

1. Remove two rack sections and place them on the coal wall side.
2. Detach the cable troughs and dismantle the middle trough in pairs, ensuring the dumbbell pins connecting them are not removed.
3. Use an inclined ramp for loading.
   • The main winch pulls the flatbed cart into position.
   • The auxiliary winch pulls the trough frame sections onto the cart, securing them immediately after loading.
4. Binding on the Cart:
   • Apply the same binding method as described earlier.
   • Ensure each cart carries no more than two middle trough sections and two cable trough sections.

2.4 Head Section Dismantling

• Dismantle the head section in the same manner as the middle trough, utilizing the inclined ramp for loading. Bind and secure the equipment as specified.

3. Transportation and Safety Measures

3.1 Loading and Transportation

• After binding, thoroughly inspect the equipment to ensure secure fastening.
• Disconnect the inclined ramp from the flatbed cart, remove the auxiliary winch wire rope, and clear the tracks.
• Use the main winch to lift the loaded cart onto the rotating track and transport it to the designated location (e.g., 1170m yard).

3.2 Safety Precautions During Transportation

1. Ensure all connections between the ramp and the flatbed cart are secure before lifting.
2. Regularly inspect winch ropes and bindings during transportation to prevent slippage.
3. Clear the track of obstacles before moving the loaded cart.

4. Key Safety and Technical Measures

4.1 General Precautions

1. Power Management:
   • Before starting dismantling work, isolate and lock out the power supply to prevent accidental activation of equipment.
2. Inspection Before Work:
   • Inspect all hoisting devices, winches, and tools for proper functioning.

4.2 Dismantling Safety

1. Assign trained personnel to oversee the dismantling and recovery process.
2. Use appropriate personal protective equipment (PPE), including helmets, gloves, and safety boots.
3. Maintain clear communication among team members during dismantling and lifting operations.

4.3 Binding and Loading

1. Use only certified binding materials such as steel cables, turnbuckles, and wire.
2. Verify the stability of the load before lifting or transporting equipment.

4.4 Equipment Maintenance

• Ensure winches and hoisting devices are well-lubricated and inspected before use.
• Replace worn or damaged components immediately to avoid accidents during operation.

5. Environmental Considerations

• Prevent oil or lubricant spills during the dismantling process to avoid contamination of the worksite.
• Properly dispose of dismantled components and materials that are no longer usable.

Conclusion

The recovery of scraper conveyors is a complex process that requires meticulous planning, adherence to safety protocols, and the use of appropriate equipment. By following the outlined steps and implementing the recommended safety measures, operators can ensure efficient dismantling and transportation while minimizing risks to personnel and equipment.

Through careful execution, the recovery process contributes to maintaining operational efficiency and resource utilization in mining and industrial settings.