News

As the core load-bearing component of lifting machinery, the regular inspection of crane hook is the key to ensure the safety of operation. The following is the standardized inspection process in accordance with the national special equipment safety technical specifications:

1. Inspection cycle regulations

1. Daily inspection : performed by the operator before each shift

2. Monthly inspection : performed by the equipment administrator

3. Annual inspection : implemented by special equipment inspection agencies

4. Special inspection : Inspection is required after overloading, collision or overhaul

2. Qualification requirements for inspectors

• Daily inspection: Certified crane operator (Q2 certificate)

• Professional inspection: Possess the qualification of special equipment inspector (RT/MT/UT-II level)

3. Preparation of inspection tools

4. Standardized inspection process

1. Document review

• Check product certificate (in accordance with GB/T 10051)

• Check previous inspection reports (focus on the development of defects)

• Confirm that the registration certificate is valid

2. Appearance inspection (key items)

• Hook deformation inspection: opening increment ≤ 15% of original size

• Wear detection: Wear of dangerous section ≤ 10% of original size

• Crack inspection: stress concentration areas such as hook neck and thread root

• Anti-drop device: Spring lock integrity test

3. Nondestructive testing

• Magnetic particle testing (MT) : Detect surface cracks (the hook neck transition area must be inspected)

• Ultrasonic flaw detection (UT) : Detect internal defects (the root of the hook handle thread must be inspected)

• Testing standard: JB/T 6061-2007

4. Functional testing

• Rotational flexibility test (manual rotation without jamming)

• Load test (1.25 times rated static load, hovering for 10 minutes)

5. Measurement data record
Establish an inspection record table containing the following parameters:

| Test Items | Standard Value | Measured Value | Conclusion |
|----------------|----------|--------|------|
| Opening degree | ≤15% | 12% | Pass |
| Thread root cracks | None | None | Pass |
| Dangerous section wear | ≤10% | 8% | Pass |

V. Defect handling standards

1. Immediate scrapping :

   • Any visible cracks

   • Plastic deformation (the hook bends and cannot be reset)

   • The opening exceeds the original size by 15%

2. Situations requiring rectification within a specified period :

   • Failure of the anti-drop device (repaired within 3 working days)

   • Surface rust impact inspection (re-inspection after rust removal is required)

VI. Preparation of inspection report

The report should include:

1. Basic information of the equipment (model, number, user unit)

2. Inspection basis (TSG Q7015-2016)

3. Inspection data and defect maps (MT/UT inspection images)

4. Inspection conclusion (continue to use/use after rectification/stop using immediately)

VII. Precautions

1. The crane must be powered off and locked before inspection

2. Safety belts must be worn for high-altitude inspection (more than 2m above the ground)

3. If any major defects are found, they should be immediately decommissioned and reported to the regulatory authorities.

8. Typical inspection cases

The annual inspection of a 5-ton hook at a port found that:

• UT test shows a 3mm crack inside the hook neck

• MT detection found surface cracks at the root of the thread.
  Treatment measures: immediately replace the hook with a new one and trace the same batch of products

IX. Digital management suggestions

1. Establish electronic inspection files (retention period ≥ 5 years)

2. Use smart testing equipment (such as phased array UT to automatically record data)

3. Access to the special equipment supervision platform to achieve data sharing

This inspection process strictly follows the "Technical Regulations for Safety of Lifting Machinery" and can effectively prevent hook breakage accidents through systematic detection methods. It is recommended that companies formulate more detailed inspection work instructions based on their own working conditions.

| Test Items | Standard Value | Measured Value | Conclusion |
|----------------|----------|--------|------|
| Opening degree | ≤15% | 12% | Pass |
| Thread root cracks | None | None | Pass |
| Dangerous section wear | ≤10% | 8% | Pass |

| Test Items | Standard Value | Measured Value | Conclusion |
|----------------|----------|--------|------|
| Opening degree | ≤15% | 12% | Pass |
| Thread root cracks | None | None | Pass |
| Dangerous section wear | ≤10% | 8% | Pass |