When using a low net empty-handed gourd (manual chain block), protection and inspection methods are crucial to ensure safety, extend equipment lifespan, and maintain operational efficiency. Below are the key protection and inspection measures:

I. Protection Methods

Environmental Protection

Avoid Harsh Conditions: Store and use the hoist in a dry environment to prevent corrosion. Do not expose it to rain, direct sunlight, or chemical corrosion.

Temperature Control: Avoid using the hoist in extremely high or low temperatures, as this may affect the performance of lubricants and mechanical parts.

Mechanical Protection

Prevent Overloading: Strictly adhere to the rated load capacity. Overloading can cause chain deformation, gear damage, or even brake failure.

Avoid Side Loading: Do not pull the load horizontally unless the hoist is specifically designed for it, as side loading can cause chain misalignment and mechanical wear.

Load Protection

Proper Rigging: Use slings, shackles, or hooks rated for the load. Avoid sharp bends or kinks in the chain, which can weaken it.

Secure the Load: Ensure the load is balanced and securely fastened to prevent shifting during lifting.

Operator Protection

Personal Protective Equipment (PPE): Operators should wear gloves, safety helmets, and non-slip shoes to prevent injuries.

Training: Ensure operators are trained in safe use, load capacity limits, and emergency procedures.

II. Inspection Methods

Pre-Operation Inspection

Visual Check:

Chain and Hooks: Inspect for wear, corrosion, cracks, or deformation. Replace if any defects are found.

Body and Casing: Check for cracks, dents, or loose parts. Ensure the casing is intact.

Brake System: Test the brake to ensure it engages smoothly and holds the load securely.

Functional Test:

Hand Chain Operation: Pull the hand chain to ensure smooth movement without resistance or binding.

Brake Function: Lift a light load and release the hand chain to verify the brake holds the load.

Regular Maintenance Inspection

Lubrication:

Gears and Bearings: Apply lubricant according to the manufacturer's recommendations to prevent wear and corrosion.

Chain: Lubricate the load chain to reduce friction and extend its lifespan.

Wear and Tear Check:

Chain: Measure the chain pitch regularly. Replace if the elongation exceeds 3% of the original length.

Gears: Check for pitting, wear, or damage. Replace worn gears promptly.

Periodic Professional Inspection

Load Test: Conduct a load test with a weight slightly below the rated capacity to verify the hoist's performance.

Brake Adjustment: Adjust or replace the brake if it fails to engage or disengage properly.

Non-Destructive Testing (NDT): For critical applications, use NDT methods (e.g., magnetic particle inspection) to detect internal cracks or defects.

Post-Operation Inspection

Cleaning: Remove debris, grease, or dirt from the hoist after use to prevent corrosion and blockages.

Storage: Store the hoist in a clean, dry place. Cover it to protect against dust and moisture.

III. Key Inspection Points

Load Chain:

Check for broken links, excessive wear, or deformation.

Ensure the chain runs smoothly over the sprockets without binding.

Hooks:

Inspect for cracks, bends, or wear on the throat or tip.

Ensure the safety latch is intact and functions properly.

Brake System:

Verify the brake holds the load when the hand chain is released.

Check for excessive wear on brake pads or shoes.

Gears and Bearings:

Listen for unusual noises (e.g., grinding, squeaking) during operation.

Ensure smooth rotation of all moving parts.

Hand Chain and Wheel:

Check for fraying, kinks, or damage to the hand chain.

Ensure the hand wheel rotates freely without binding.

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