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GB/T 27998-2011Balance crane (English PDF)

平衡式起重机

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

December 30, 2011

Implementation date

July 1, 2012

Scope

GB/T 27998-2011 is the English-translated version of 平衡式起重机.

GB/T 27998-2011 covers the balance crane, setting the types and basic parameters, the requirements, the test methods, the inspection rules and the requirements for marking, packaging, transport and storage.

Clause 1 states that the standard applies to balance cranes whose main structural feature is a parallelogram balance bar system, and that balance cranes with another working area, taken in the vertical section, may use it as a reference.

Clause 3 defines the forces used in the standard, namely the operating force in the diametrical direction, applied perpendicular to the centreline of the slewing column to move the load within the working space, its maximum value, the maximum unbalance force in the diametrical direction, taken as the greatest additional radial force needed to hold the hook still at a point in any vertical section of the working space, and the tangential operating force, applied perpendicular to the radius of gyration in any horizontal section to move the load.

The normative references include the crane design rules of GB/T 3811, the crane test code and procedures of GB/T 5905-2011, the recommended weld grooves of GB/T 985.1, the carbon steel electrodes of GB/T 5117, the radiographic testing of fusion welded metal joints of GB/T 3323-2005, the rust grades of steel surfaces before painting of GB/T 8923-1988 and the cross-cut test for paints and varnishes of GB/T 9286-1998, while packaging refers to GB/T 13384 and components to the hand hoist hook standard JB/T 4207.1.

The standard was proposed by the China Machinery Industry Federation, is administered by the national crane standardization technical committee, SAC/TC227, and was drafted by an electrical machinery company in Yangquan with lifting machinery makers in Jiangsu and Jiaozuo. It was issued on 30 December 2011 and has applied since 1 July 2012.

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Document preview — GB/T 27998-2011

National Standard of the People's Republic of China

ICS: 53.020.20
Classification: J 80

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Foreword
1 Scope
2 Normative references
3 Terms and Definitions

Foreword

This standard was drafted in accordance with GB/T 1.1-2009 given rules. The standard proposed by China Machinery Industry Federation.

1 Scope

This standard specifies the types and basic parameters of balance cranes, requirements, test methods, inspection rules, marking, packaging, transport and Storage.

This standard applies to the parallelogram balance bar system as the main structural features of balanced cranes, other operating area (vertical section) Balanced crane can be implemented by reference.

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein Member. For undated references, the latest edition (including any amendments) applies to this document.

GB/T 985.1 gas welding, arc welding, gas welding and beam welding Recommended groove

GB/T 3323-2005 Metal fusion welded joints radiography

GB/T 3811 crane design specifications

GB/T 5117 carbon steel electrode

GB/T 5905-2011 Crane test specification and procedures

GB/T 8923-1988 steel surface before painting Rust grades and grade

GB/T 9286-1998 Paints and varnishes Cut test

GB/T 13384 mechanical and electrical products packaging General technical conditions

JB/T 4207.1 manual lifting equipment hook

JB/T 7601.6 wire and cable equipment basic technical requirements - Part 6: Machining

3 Terms and Definitions

The following terms and definitions apply to this document.

3.1 Diametrical direction operating force

The working space, the movement of the heavy object, a direction perpendicular to the centerline of the rotary column applied force.

3.2 Maximal operating force of diametrical direction

Within the work space to make the weight movement, the direction perpendicular to the centerline of the rotary column applied maximum force.

3.3 Maximal unbalance of force in diametrical direction

Any working space within a vertical cross-section, in order to maintain the hook at some point in a stationary state, the increase of the maximum radial force.

3.4 Tangent direction operating force

Any working space within a horizontal section, in order to make the weight movement, the direction perpendicular to the radius of gyration of the applied force.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

Referenced standards

Normative references

Similar standards

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