This standard specifies the types, basic parameters, technical requirements, test methods and inspection rules of electric single-beam suspension cranes. This standard applies to general-purpose electric single-beam suspension cranes with working levels A3~A5 and working environment temperatures of -25~40℃. The same or similar parts of special electric single-beam suspension cranes can also be used for reference. This standard does not apply to cranes working under the following conditions. a. Working in an environment with explosion hazards and fire hazards; b. Working in places with relative humidity greater than 85% and in an environment full of corrosive gases; c. Lifting molten metal, toxic substances and flammable and explosive items. JB/T 2603-1994 Electric Single-beam Suspension Crane JB/T2603-1994 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T 2603-94
Electric Single-girder Suspension Crane
1994-07-18 Issued
Ministry of Machinery Industry of the People's Republic of China
1995-07-01 Implementation
Mechanical Industry Standard of the People's Republic of China
Electric Single-girder Suspension Crane
1 Subject Content and Scope of Application
JB/T 2603-94
Replaces JB2603--84
This standard specifies the type, basic parameters, technical requirements, test methods and inspection rules of electric single-girder suspension cranes. This standard applies to general-purpose electric single-girder suspension cranes (hereinafter referred to as cranes) with working levels A3 to A5 and working environment temperatures of -25 to +40℃. The same or similar parts of special electric single-beam suspension cranes can also be used for reference. This standard does not apply to cranes working under the following conditions: working in environments with explosion hazards and fire hazards; b.
working in places with relative humidity greater than 85% and in environments filled with corrosive gases; c.
lifting molten metal, toxic substances and flammable and explosive items. 2 Reference standards
GB1591
GB3323
GB3768
GB 3811
GB5905
GB 6164.2
GB8923
GB9286
GB10095
GB11345||t t||GB/T 13306
GB/T 13384
JB2299
JB/T 6391.2
JB/ZQ 4000.3
ZB J80 013. 2
ZB J80 013. 3
ZB J80 013. 7
3 Types and basic parameters
3.1 Types
Packaging, storage and transportation pictorial symbols
Carbon structural steel
Low alloy structural steel
Radiography and quality classification of steel fusion welded butt jointsSimplified method for determining sound power level of noise sources
Crane design specificationsbzxZ.net
Crane test specifications and procedures
Crane rubber buffers
Rust grade and rust removal grade of steel surface before paintingCross-cut test of paint and varnish paint film
Precision of involute cylindrical gears
Manual ultrasonic flaw detection method of steel welds and flaw detection result classification label
General technical conditions for packaging of electromechanical products
Tropical low-voltage electrical appliances|| tt||Paint colors and safety signs for mining, engineering, lifting and transportation machinery products Technical conditions for sliding power transmission devices for cranes General technical requirements for welded parts
Technical conditions for wire rope electric hoists
Conical rotor motors for wire rope electric hoists Safety regulations for wire rope electric hoists
Crane types are divided into the following categories according to their structural features (see Figures 1 to 3): 3.1.1
Approved by the Ministry of Machinery Industry on July 18, 1994
Implementation on July 1, 1995
JB/T2603-94
The crane with the electric hoist running on the lower flange of the main beam and the electric hoist arranged under the main beam (see Figure 2) has a product code of LX,
b. The electric hoist trolley runs on the lower flange of the main beam, and the electric hoist is arranged on the side of the main beam (see Figure 3). Its product code is LXC
Note: C and C in the figure are the maximum working dimensions of the hoist (refer to the product design drawing) Figure 2
Partial side view
Partial side view
JB/T 2603-94
3.1.2 The main beam of the crane generally adopts I-shaped, box-shaped or combined structure. 3.1.3 Model indication method
Crane working level
Span, m
Rated lifting capacity, t
Product code (see 3.1.1)
3.1.4 Marking example
The marking of LX crane with rated lifting capacity of 2t, span of 11m and working level A5 is: Crane LX2-11A5JB/T2603-94
The marking of LXC crane with rated lifting capacity of 5t, span of 9m and working level A4 is: Crane LXC5-9A4JB/T2603--94||tt| |3.2 Basic parameters
3.2.1 The rated lifting capacity of the crane (code: G., unit: t) series is stipulated as follows: 0.5, 1*1.6.2.2.5, 3.2, 4, 5.6.3.8, 103.2.2 The span of the crane (code: S, unit: m) is stipulated as follows: 3, 4, 5, 6, 7, 8, 910, 11, 12, 13, 14, 15, 16. 3.2.3 The cantilever length of the main beam (code: 1, unit: m) should be selected as: 0.25. 0.5, 0.75, 1.
3.2.4 The base distance W of the crane is generally (1/8~1/5)S. But generally not less than S/6. 3.2.5 The lifting height of the crane (unit: m) is stipulated as follows: 3.2, 4, 5, 6.3, 8, 10, 12.5, 16, 20. 3.2.6 The lifting speed of the crane (unit: m/min) is stipulated as 0.5-~12.5. 3.2.7 The operating speed of the crane (unit: m/min) is stipulated as 8~40. 3.2.8 The operating speed of the electric hoist (unit: m/min) is stipulated as 8~40. 4 Technical requirements
The design and manufacture of the crane shall comply with the relevant provisions of GB3811 and this standard. 4.1 Environmental conditions
4.1.1 The power supply of the crane is three-phase AC, with a rated frequency of 50Hz and a rated voltage of 380V. The upper limit of the allowable voltage fluctuation on the motor and electrical control equipment is +10% of the rated voltage, and the lower limit (at peak current) is -10% of the rated voltage. The internal voltage loss of the crane is 3%.
4.1.2 The altitude of the place where the crane is installed and used should not exceed 2000m (the motor capacity should be checked when it exceeds 1000m). 4.1.3 The radiant heat temperature of the crane hook caused by the hoisted objects should not exceed 300℃. 4.1.4 The ambient temperature should not exceed +40℃, and the average temperature within 24 hours should not exceed +35℃. 4.1.5 The crane should generally work indoors. 4.2 Performance
4.2.1 Parameters related to the use of the crane should comply with Article 3.2 of this standard or the requirements put forward by the user in the order contract. 4.2.2 The static rigidity of the crane is stipulated as follows: the vertical static deflection caused by the rated lifting weight and the deadweight of the electric hoist in the middle of the main beam span is not greater than S/700.
JB/T 2603-94
4.2.3 The dynamic rigidity of the crane is generally not specified in the supply, but it is only assessed when the user has requirements. The assessment index is that when the electric hoist is located in the middle of the span, the full-load natural frequency of the main beam should not be less than 2Hz. 4.2.4 When the hoisted load moves to the cantilever limit position at the end of the main beam, the wheel at the other end is not allowed to have negative wheel pressure. It is recommended to use double-sided drive for the crane driving wheel group. If single-sided drive is used, attention should be paid to the balance of the entire wheel group, and the passive wheel should be counterweighted when necessary. 4.2.5 The leading and lagging distance of the same-side wheel group at both ends of the crane should not be greater than S/60. 4.3 Materials
4.3.1 The material of the metal structural parts of the crane, carbon structural steel according to GB700 and low alloy structural steel according to GB1591, the selection of grades should meet or not be lower than the requirements of Table 1.
Component category
Working environment temperature
Steel grade
Note: 1) Important components refer to main beams and end beams. Important components\)
Not less than 20℃
Q235-B
Lower than -20～-25℃
Q235-D
2) The impact energy is required to be not less than 273 at -20℃, which should be proposed or supplemented when ordering. Other components
-25 ~~+40℃
4.3.2 The quality of metal materials should be certified by the supplier. Otherwise, the manufacturer should conduct chemical analysis and mechanical property tests. 4.4 Main components
4.4.1 Electric hoists for lifting mechanisms should comply with the provisions of ZBJ80013.2. 4.4.2 The matching motor shall comply with or not be lower than the provisions of ZBJ80013.3. 4.4.3 The crane shall be equipped with rubber buffers complying with the provisions of GB6164.2 or other buffers with comprehensive performance not lower than that of GB6164.2.
4.4.4 The precision of the gear pair of the reducer for the running mechanism shall not be lower than the 8-8-7 level specified in GB10095, and the precision of the open gear shall not be lower than the 9-8-8 level.
4.4.5 The camber of the main beam in the middle of the span F=（1/1000～1.4/1000）S, and the maximum camber shall be located within the range of S/10 in the middle of the span. The correction value of the influence of the deadweight of the steel wire on the camber is shown in Xie Lu A (Supplement). 4.4.6 The horizontal bending value of the main beam f≤S/2000. 4.4.7 The local flatness of the web of the main beam, when the web height is not more than 700mm, check with a 500mm flat ruler, the compression area of ​​the web is not more than 3.5mm, and the tension area of ​​the web is not more than 5mm; when the web height is more than 700mm, check with a 1000mm flat ruler. The compression area of ​​the web is not more than 5.5mm, and the tension area of ​​the web is not more than 8mm. 4.4.8 The butt welds in the tension zone of the main beam shall be subjected to non-destructive testing. The testing results shall comply with the Grade I quality requirements in GB3323 or the Grade 1 quality requirements in GB11345.
4.4.9 There shall be no obvious visual defects such as cracks, holes, solid slag inclusions, lack of fusion, and incomplete penetration on the outside of the weld. The weld quality assessment level other than that specified in Article 4.4.8 shall comply with the provisions of JB/ZQ4000.3. Butt welds are BS grade and fillet welds are BK grade. 4.4.10 The welding rods, welding wires and flux used for welded parts shall be compatible with the materials being welded. 4.5 Assembly accuracy
4.5.1 Crane span deviation 4S: When S≤10m, AS is ±4mm:10
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.