JB/T 7688.1-2008 English PDF (JBT7688.1-2008)

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JB/T 7688.1-2008: Specifications for metaallurgy crenes. Part 1: General requirements
JB/T 7688.1-2008
JB
MECHANICAL INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 53.020.20
J 80
Filing No.: 24654-2008
Replacing JB/T 7688.1-1995
Specifications for metallurgy cranes - Part 1: General
requirements
ISSUED ON: JUNE 04, 2008
IMPLEMENTED ON: NOVEMBER 01, 2008
Issued by: National Development and Reform Commission of PRC
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 5 
3 Technical requirements ... 8 
3.1 Environmental conditions ... 8 
3.2 Use performance ... 9 
3.3 Materials of important metal structural parts ... 10 
3.4 Welding ... 10 
3.5 High-strength bolted connections ... 11 
3.6 Main components ... 11 
3.7 Assembly ... 14 
3.8 Electrical equipment ... 17 
3.9 Safety and hygiene ... 22 
3.10 Painting ... 24 
3.11 Lubrication ... 25 
4 Test method ... 25 
4.1 Visual inspection ... 25 
4.2 Static load test ... 25 
4.3 Static stiffness test ... 26 
4.4 Rated load test ... 26 
4.5 Dynamic load test ... 26 
4.6 Electric brake deceleration test of hoisting mechanism ... 27 
4.7 Noise test ... 27 
4.8 Vertical and horizontal deflection detection of bridge and crane wheels ... 27 
5 Inspection rules ... 28 
5.1 Inspection classification ... 28 
5.2 Exit-factory inspection ... 28 
5.3 Type test ... 29 
6 Sign, packaging, transportation, storage ... 30 
6.1 Sign ... 30 
6.2 Packaging, transport, storage ... 30 
Appendix A (Normative) Detection method of braking distance of hoisting mechanism
... 32 
Appendix B (Normative) Detection method for horizontal and vertical deflection of
wheel axes of bridge and trolley ... 34 
Specifications for metallurgy cranes - Part 1: General
requirements
1 Scope
This Part of JB/T 7688 specifies the general technical requirements, test methods,
inspection rules for metallurgical cranes (hereinafter referred to as cranes).
This Part is mainly applicable to special-purpose cranes for metal smelting, rolling,
thermal processing enterprises, including ladle cranes, bin cranes, slab handling cranes,
claw cranes, forging cranes, quenching cranes. Other similar metallurgical cranes may
also refer to this standard.
2 Normative references
The terms in the following documents become the terms of this Part through the
reference of this Part of JB/T 7688. For dated reference documents, all subsequent
amendments (excluding errata content) or revisions do not apply to this Part; however,
parties who reach an agreement based on this Part are encouraged to study if the latest
versions of these documents are applicable. For undated references, the latest edition of
the referenced document applies.
GB/T 146.1 Standard gauge railway rolling stock gauge
GB/T 699 Quality carbon structural steels
GB/T 700 Carbon structural steels (GB/T 700-2006, ISO 630:1995, NEQ)
GB 755 Rotating electrical machines - Rating and performance (GB 755-2000, idt
IEC 60034-l:1996)
GB/T 985 Basic forms and sizes of weld grooves for gas welding, manual welding
and gas- shielded welding
GB/T 986 Basic forms and sizes of weld grooves for submerged arc weld
GB/T 1228 High strength bolts with large hexagon head for steel structures (GB/T
1228-2006, ISO 7412:1984, NEQ)
GB/T 1229 High strength large hexagon nuts for steel structures (GB/T 1229-2006,
ISO 4775:1984, NEQ)
GB/T 10051 (all parts) Lifting hooks
GB/T 10183-2005 Cranes - Overhead travelling cranes and portal bridge cranes -
Tolerances for cranes manufacture and tracks laying (ISO 8306:1985, MOD)
GB/T 11352 Carbon steel castings for general engineering purposes (GB/T 11352-
1989, neq ISO 3755:1975)
GB/T 13306 Plates
GB/T 13384 General specifications for packing of mechanical and electrical product
GB/T 14405-1993 General bridge crane
GB 15052-1994 Lifting appliances - Dangerous positions and signs
GB/T 19418 Arc-welded joints in steel - Guidance on quality levels for
imperfections (GB/T 19418-2003, ISO 5817:1992, IDT)
GB/T 20303.5 Cranes - Cabins - Part 5: Overhead travelling and portal bridge cranes
(GB/T 20303.5-2006, ISO 8566-5:1992, IDT)
JB/T 3241 SWP universal coupling with spider and split bearing eye
JB/T 4315 Crane electric control equipment
JB/T 5513 SWC type whole fork cross spindle universal coupling
JB/T 6392 Rail wheels for crane
JB/T 6406 Electro-hydraulic drum brakes
JB/T 7009 Spherical roller coupling for drum
JB/T 7017 Hydraulic buffer for cranes
JB/T 7019 Test methods for fiber cement products
JB/T 7020 Testing method of insulating glass
JB/T 7687.l ~ JB/T 7687.4 Lifting hook accessories
JB/T 7944 Sampling procedures for inspection by attributes of coiled helical springs
JB/T 8110.1 Spring buffer for crane
JB/T 8854.l Curved-tooth coupling GCLD
JB/T 8854.2 Curved-tooth coupling GIICL, GIICLZ
JB/T 8854.3 Curved tooth coupling GICL, GICLZ
JB/T 8905.1 Three-point support gearboxes for cranes
JB/T 8905.2 Foot mounted gearboxes for cranes
JB/T 9005 Casting sheaves for cranes
JB/T 9006 Drums for cranes
JB/T 10104 YZ Range of three-phase induction motors for crane and metallurgical
application - Technical specifications
JB/T 10105 YZR Range of three-phase slip-ring rotor induction motors for crane
and metallurgical application technical specifications
JB/T 10559 Non-destructive testing of lifting appliances - Ultrasonic testing of steel
welds
JB/T 10833 The polyurethane buffer for cranes
3 Technical requirements
3.1 Environmental conditions
3.1.1 The power supply of the crane is generally three-phase AC, which has a frequency
of 50 Hz (60 Hz). The voltage is 380 V. For large metallurgical cranes, if the single-
mechanism driving motor's capacity exceeds 400 kW, OR if the total motor capacity
exceeds 500 kW during use, it is recommended to use a three-phase AC, 50 Hz, 3000
V power supply. Under normal working conditions, the voltage fluctuation of the power
supply system, at the access point of the crane feeder, shall not exceed ±10% of the
rated value.
If there are special requirements for the power supply, it can be determined by
negotiation between the supplier and the buyer, according to the needs of the user.
3.1.2 When the altitude of the place, where the crane is installed and used exceeds 1000
m, the capacity of the motor shall be checked, according to the provisions of GB 755.
3.1.3 The working environment temperature and humidity of the crane shall meet the
following requirements:
a) The working environment temperature of the crane is generally -10 °C ~ +50 °C;
b) The relative humidity does not exceed 50%, at a temperature of +40 °C.
accuracy requirements: ;
- For cranes requiring high positioning accuracy: .
Note: The realization of the positioning accuracy requirements depends on the complementary
matching of different speed control system grades and different static rigidity indicators, whilst
the acceptable positioning accuracy refers to the positioning accuracy between low and medium.
3.2.6 During the static load test, the crane shall be able to withstand a test load of 1.25
times the rated working load. After the test, carry out a visual inspection. There is no
crack, permanent deformation, peeling of paint, no loosening at the joints.
3.2.7 During the dynamic load test, the crane shall be able to withstand a test load of
1.1 times the rated working load. During the test, it shall work normally; the safety
devices such as brakes shall opera...