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1. Theme content and scope of application

This standard specifies the inspection content, requirements and inspection cycles when using straight handle hooks on lifting machinery and equipment.

This standard applies to straight handle hooks (hereinafter referred to as hooks) on lifting machinery and equipment.

2. Reference standards

GB 3811 Crane design specifications

GB 10051.4 Lifting hook, straight handle single hook blank

GB 10051.5 Lifting hook, straight handle single hook

3. Check content and requirements

Inspection before use

The hook must have the manufacturer’s certificate and other technical documents before it can be used.

Check the logo of the hook. The single hook with a straight handle (hereinafter referred to as the single hook) should comply with the provisions of 5.2 in GB 10051.2, and the double hook with a straight handle (hereinafter referred to as the double hook) should comply with the provisions of the corresponding standard.

Hooks with hook numbers 006 to 5 should review the opening degree α2, and hooks with other hook numbers should review the measured length y or y1 and y2 (as shown in Figure 1 and Figure 2). The single hook should comply with the requirements of Table 2 of GB 10051.4 or Table 1 of GB 10051.5, and the double hook should comply with the requirements of the corresponding standards.

Usage check

Surface defects

Check the surface defects of the hook. There should be no cracks on the surface. If there are cracks, it should be scrapped.

Deformation

Hooks with 006~5 should be checked for opening degree α2, and hooks with other hook numbers should be checked for measured length y or y1 and y2 (Figure 1 and Figure 2). When the value exceeds 10% of the actual size before use, the hook should be scrapped.

Check the torsional deformation of the hook. When the twist angle α of the hook body (Figure 1 and Figure 2) exceeds 10°, the hook should be scrapped.

The handle of the hook must not be plastically deformed, otherwise it should be scrapped.

Wear and tear

Check the wear amount ΔS of the hook (Figure 1 and Figure 2). The actual height of the dangerous section after wear shall not be less than the basic size (see single hook)

GB 10051.4, double hook (see corresponding standard) 95%, otherwise the hook should be scrapped.

Corrosion

The size of the hook handle diameter d1 (as shown in Figure 1 and Figure 2) after corrosion shall not be less than 95% of the basic size (see GB 10051.4 for single hooks and corresponding standards for double hooks), otherwise the hook should be scrapped.

The threads of the hook must not be corroded.

Defects in the hook are not allowedWelding repair allowed.

4. Inspection cycle and inspection personnel

See Table 1 and Table 2 for regular and periodic inspection cycles. Frequent inspections can be performed by operators or other designated personnel, and periodic inspections should be performed by full-time inspection personnel.

Inspectors should inspect items one by one in accordance with Article 3.2 of this standard, and regular inspections should be recorded and filed.

Separate regulations may be made for special use situations.

1. Theme content and scope of application

This standard specifies the inspection content, requirements and inspection cycles when using straight handle hooks on lifting machinery and equipment.

This standard applies to straight handle hooks (hereinafter referred to as hooks) on lifting machinery and equipment.

2. Reference standards

GB 3811 Crane design specifications

GB 10051.4 Lifting hook, straight handle single hook blank

GB 10051.5 Lifting hook, straight handle single hook

3. Check content and requirements

Inspection before use

The hook must have the manufacturer’s certificate and other technical documents before it can be used.

Check the logo of the hook. The single hook with a straight handle (hereinafter referred to as the single hook) should comply with the provisions of 5.2 in GB 10051.2, and the double hook with a straight handle (hereinafter referred to as the double hook) should comply with the provisions of the corresponding standard.

Hooks with hook numbers 006 to 5 should review the opening degree α2, and hooks with other hook numbers should review the measured length y or y1 and y2 (as shown in Figure 1 and Figure 2). The single hook should comply with the requirements of Table 2 of GB 10051.4 or Table 1 of GB 10051.5, and the double hook should comply with the requirements of the corresponding standards.

Usage check

Surface defects

Check the surface defects of the hook. There should be no cracks on the surface. If there are cracks, it should be scrapped.

Deformation

Hooks with 006~5 should be checked for opening degree α2, and hooks with other hook numbers should be checked for measured length y or y1 and y2 (Figure 1 and Figure 2). When the value exceeds 10% of the actual size before use, the hook should be scrapped.

Check the torsional deformation of the hook. When the twist angle α of the hook body (Figure 1 and Figure 2) exceeds 10°, the hook should be scrapped.

The handle of the hook must not be plastically deformed, otherwise it should be scrapped.

Wear and tear

Check the wear amount ΔS of the hook (Figure 1 and Figure 2). The actual height of the dangerous section after wear shall not be less than the basic size (see single hook)

GB 10051.4, double hook (see corresponding standard) 95%, otherwise the hook should be scrapped.

Corrosion

The size of the hook handle diameter d1 (as shown in Figure 1 and Figure 2) after corrosion shall not be less than 95% of the basic size (see GB 10051.4 for single hooks and corresponding standards for double hooks), otherwise the hook should be scrapped.

The threads of the hook must not be corroded.

Defects in the hook are not allowedWelding repair allowed.

4. Inspection cycle and inspection personnel

See Table 1 and Table 2 for regular and periodic inspection cycles. Frequent inspections can be performed by operators or other designated personnel, and periodic inspections should be performed by full-time inspection personnel.

Inspectors should inspect items one by one in accordance with Article 3.2 of this standard, and regular inspections should be recorded and filed.

Separate regulations may be made for special use situations.