When using a manual hoist, it is necessary to strictly follow the following precautions to ensure safe operation and reliable equipment operation, especially in special environments such as tunnel construction, which requires special precautions:

Pre operation inspection and preparation

Equipment status verification

Inspect key components such as chains, hooks, brakes, gears, etc. for cracks, deformation, corrosion, or excessive wear (such as chain diameter wear ≤ 10%, pitch elongation ≤ 3%); The hook needs to be equipped with a locking device to prevent detachment; The friction surface of the brake should be clean and free of oil stains to ensure effective self-locking function.

Test the braking system: After stopping the operation, the pawl and ratchet should automatically engage, with a sliding amount of ≤ 5mm (better than the national standard of 15mm); The friction disc brake needs to pass a static load test (maintain 1.25 times the rated load for 10 minutes without slipping).

Environmental adaptability confirmation

Select the corresponding model based on the tunnel environment (humidity, dust, high temperature, limited space, etc.): explosion-proof type (Ex standard) for oil and gas tunnels, waterproof type (IP65) for humid environments, high-temperature resistant lubricating grease for high temperature scenarios, stainless steel chains or nickel plated hardened treatment for corrosion prevention.

Safety regulations during operation

Load and operational limitations

Overloading is strictly prohibited (rated load ≤ equipment nominal value), and diagonal pulling, sudden pulling of chains, or emergency stop and start are prohibited; When lifting with double gourds, a dedicated person is required to command and distribute the load evenly; After the heavy object is lifted off the ground, it needs to be tested to confirm the reliability of the braking.

During operation, personnel are not allowed to stand under heavy objects, within the lifting path, or on the opposite side of the chain wheel; Hand pulling force ≤ 300N when fully loaded, to avoid operational fatigue; The lifting speed needs to be controlled (such as the lifting speed of tunnel chilled water pipes ≤ 5cm/min).

Special scenario response

Compact hand cranked hoists (small in size and flexible in operation) are selected for narrow tunnel areas; Regularly check the condition of lubricating grease in high temperature environments to avoid dry friction; The dust environment requires sealed bearing design and regular cleaning of accumulated dust.

Maintenance and Regular Inspection

routine maintenance

Clean the gourd after use, apply rust proof grease, and store it in a dry and ventilated place; The chain needs to be regularly lubricated (such as rust proof grease) to avoid jamming or rusting; Replace the brake friction plate in a timely manner when the wear exceeds the limit.

Regularly conduct no-load operation checks (each mechanism operates flexibly without jamming) and dynamic load tests; At least once a year, conduct a comprehensive disassembly inspection and static load test (1.25 times the rated load).

Long term storage and maintenance

Long term storage should be coated with rust proof grease and placed in a dry and ventilated place; Disconnect the main isolation switch during maintenance to ensure personnel safety; The welding points must comply with the "Code for Acceptance of Welding of Pressure Pipelines", ensuring no stress and a smooth groove.

Safety devices and emergency response

Safety device configuration

Integrated overload protection (automatic shutdown when the load exceeds 10%), height limit infrared sensing, emergency switch and isolation switch, in compliance with CE/CMA certification; Intelligent models can be equipped with high-precision sensors and handheld controllers to achieve real-time monitoring of weight and speed, as well as uniform descent control.

Emergency response measures

Stop immediately when the brake fails and take emergency braking measures (such as backup brakes or manual intervention); When decoupling or falling occurs, evacuate personnel quickly and activate emergency plans; Regularly drill emergency operation procedures to enhance personnel's emergency response capabilities.

The main equipment produced by Hebei Makita: stage electric hoist, electric chian hoist, wire rope electric hoist，Hand chain hoist, lever hoist, pneumatic hoist and other lifting equipment