Some standard content:
JB/T8906
This standard is equivalent to BS73331990 (confirmed on August 22, 1996) "Specifications for jib cranes". This standard differs from BS7333:1990 in the following technical contents: the load spectrum coefficient of cranes adopts the data of GB/T3811-1983 "Specifications for Crane Design"; the dynamic load test load of cranes adopts the data specified in ISO4310:1981 "Specifications and Procedures for Crane Tests"; basic parameters are added due to the needs of my country's market and national conditions. Appendix A and Appendix B of this standard are both suggestive appendices. This standard is proposed and managed by the National Technical Committee for Standardization of Hoisting Machinery. The responsible drafting units of this standard are: Jiangsu Sanma Hoisting Machinery Manufacturing Company and Beijing Hoisting and Transportation Machinery Research Institute. The participating drafting units of this standard are: Wujiang Electric Hoisting Machinery Factory and Sichuan Crane Factory; the main drafters of this standard are: Cui Zhenyuan, Zhan Boping, Sun Xiaoping, and Shao Qinggen. This standard was first issued in June 1999.
1 Scope
Machinery Industry Standard of the People's Republic of China
Slewing jib crane
Slewing jib crans
JB/T 8906--1999
eqv BS 7333:1990
This standard specifies the basic parameters, requirements, inspection rules, etc. of slewing jib cranes (hereinafter referred to as cranes) that are used in conjunction with manual, electric or pneumatic hoists and are horizontally slewing, rather than luffing (pitch). 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB191--1990 Pictorial marking for packaging, storage and transportation
GB/T 3323-1987
Radiography and quality classification of steel fusion welded butt jointsAcousticsDetermination of sound power level of noise source by sound pressure methodSimplified method using envelope measurement surface above reflecting surfaceGB/T 3768--1996
GB/T 3811-1983
GB/T 5905--1986
GB/T 8923-1988
GB/T 9286--1988
GB/T 13306—1991
GB/T 11345--1989
GB/T 13384—1992
3 Definitions
Crane design specifications
Crane test specifications and procedures
Surface rust grade and rust removal grade of steel before painting Cross-cut test of paint and varnish film
Manual ultrasonic flaw detection method of steel welds and classification of deep flaw results General technical conditions for packaging of electromechanical products
This standard adopts the following definitions:
3.1 Effective radius R
The horizontal distance between the centerline of rotation and the vertical centerline of the load sling at the outer end, see Figures 1 to 5. 3.2 Deformation length R+UA
Effective radius plus the height from the working ground to the lower side of the jib. 3.3 Calculated deformation
The calculated vertical displacement at the effective radius caused by the crane's deadweight load plus the rated lifting load acting at the effective radius.
3.4 Vertical deflection
The actual vertical displacement caused by the rated lifting load acting at the effective radius. 3.5 Allowable deflection
The maximum allowable vertical displacement caused by the rated lifting load acting at the effective radius. 3.6 Tipping moment
Approved by the State Bureau of Machinery Industry on June 28, 1999 and implemented on January 1, 2000
JB/T8906—1999
The sum of the unbalanced moment acting at the effective radius caused by the total load (excluding impact) and the deadweight moment of the jib crane 3.7 Vertical load acting on the support
The axial load applied by the jib crane plus the total load acting on the foundation or support plate. 3.8 Load acting on the support
The load caused by the maximum tipping moment and the vertical force caused by the applied load. 3.9 Rotationwww.bzxz.net
The rotational movement of the crane jib and superstructure on the vertical axis. Types and basic parameters
4.1 Type
4.1.1 According to product structure
4.1.1.1 Column-type jib crane
a) Column-type jib crane with lower support: rotation angle ≤270°, see Figure 1; b) Column-type jib crane with lower support: rotation angle ≤360°, see Figure 2; c) Column-type jib crane with upper and lower supports: rotation angle ≤360°, see Figure 3. Effective radius R
Effective radius R
V is solved as control
Effective radius R
4.1.1.2 Wall-mounted jib crane
JB/T 8906—1999
a) Wall-mounted installation rotation angle <270°, see Figure 4; b) Wall column installation rotation angle 270°, see Figure 5. Effective radius R
4.1.2 According to the trolley suspension method, it is divided into
a) External suspension type, see Figure 6;
b) Internal suspension type, see Figure 7.
4.1.3 Model identification method
Crane working level (see Table 3)
Effective radius, m
Lifting height, m
-Rated lifting capacity, t
Effective radius R
-Characteristic code: jib slewing; electric D; manual not indicated [BZ——fixed column jib crane
4.1.4 Marking example
【BX-—Wall (pilaster) jib crane a) Rated The rated lifting capacity is 3.2t, the lifting height is 4m, the effective radius is 3m, the working level is A4, and the fixed-column jib crane with electric slewing is marked as: Crane BZD3.2-4×3A4JB/T8906-—1999b) The rated lifting capacity is 5t, the lifting height is 4m, the effective radius is 5m, the working level is A3, and the wall-mounted jib crane with manual slewing is marked as: Crane BX5-4X5A3JB/T8906—1999 Basic parameters
The basic parameters of the crane are shown in Table 1.
Rated lifting weight G,
Lifting height
Effective radius R
Lifting speed
Im/min
Operating speed
Slewing speed
Slewing angle
JB/T8906—1999
Basic parameters of crane
0.125,0.25,0.5,1,2,3.2(3),5,6.3(6),8,102~10 (can be increased by 0.5m)
2~~10 (can be increased by 0.5m)
2,3.2(3),4,5,6.3(6),8,10.12.5(12)0. 32,0.8,1,1. 6(1.5),2,2.5.3.2(3),46.3,10,12. 5,14.16,18.20
180°, 270°, 360°, any
4.3 The information that the user should provide in the inquiry and/or order contract is detailed in Appendix A (the appendix of reminders). In order to provide the most suitable crane that meets the working conditions and working conditions. 5 Requirements
5.1 Environmental conditions
5.1.1 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 voltage fluctuation allowed 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. 5.1.2 The altitude of the crane installation site shall not exceed 2000m (the motor capacity should be checked when it exceeds 1000m). 5.1.3 The working environment temperature of the crane is -25～+40C. 5.1.4 There must be no flammable, explosive or corrosive gases in the working environment of the crane. 5.1.5 The crane is not allowed to lift molten metal, toxic substances or flammable and explosive substances. 5.2 Performance
5.2.1 Classification
Crane According to the provisions of GB/T3811, the working level of the crane is determined according to Table 2 and Table 3. Table 2 Load state of the crane and its nominal load spectrum coefficient Load state
Nominal load spectrum coefficient Kp
Rarely lift the rated load, generally lift light loads Occasionally lift the rated load...·Generally lift medium loads Often lift the rated load, generally lift heavier loads Frequently lift the rated load
Load state
Q4—-
Nominal load
Spectrum coefficient
JB/T8906-1999
Table 3 Working level of the crane
Crane utilization level and maximum number of working cycles U3
3.2×10/6.3×101
.25×105j2.5×105
Typical working levels of cranes are shown in Table 4.
Type and purpose
Standby working conditions: pump station, maintenance workshop, emergency repair, etc. Extra light working conditions: general machine processing workshop, etc.
Light working conditions: unloading, warehouse, etc.
Intermediate working conditions, loading and assembling production machines, etc. Extra heavy working conditions: process room, electromagnetic chuck 5.2.3 Allowable stress
5×105
Typical working level of crane
Utilization level
U2～U4
U4～U6
U5～U8
1×10m
2×106
Load state
The allowable stress and design of the crane structure shall comply with the provisions of 3.4.1 of GB/T3811-1983. 5.2.4 Allowable Deflection
Vertical deflection should be such that: a) the trolley on the boom will not lose control during normal operation; b) the boom cannot rotate on its own.
4×106
>4×10°
Working Class
A2～A4
The crane should be designed so that the vertical deflection caused by the rated lifting weight at the effective radius does not exceed the provisions of Table 5. Note: The deflection values in Table 5 apply to the crane structure and do not include the deflection caused by the looseness of the supporting structure, foundation or support, and pin shaft. Table 5 Allowable Deflection
Crane Working Class
Deflection
A1,A2,A3
(R+UA)I/250
1) (R+UA) is only applicable to jib cranes installed on columns. 5 Recommended values of maximum lifting speed are shown in Table 6.
Table 6 Recommended values for maximum lifting speed
Crane working level
Lifting speed
5.2.6 Welding
5.2.6.1 The butt welds of the column and the jib shall be subjected to non-destructive testing. The radiographic testing shall not be lower than Class B specified in GB/T3323, and the ultrasonic testing shall comply with Class I specified in GB/T11345. 5.2.6.2 There shall be no obvious defects such as cracks, holes, solid inclusions, lack of fusion, lack of penetration, etc. visible on the outside of the weld. 5.3 Safety and Health
5.3.1 Stopper
JB/T8906—1999
The crane shall be equipped with a stopper at the slewing bearing at the end of the cantilever. 5.3.2 When the crane is in a non-enclosed factory building and there is no other external noise interference, the noise level of the whole machine measured at a distance of 1m from the noise source should be ≤85 dB(A).
5.3.3 After all the electrical equipment of the crane is installed, the insulation resistance of the main circuit to the ground should be ≥1.0M0 under normal circumstances. 5.3.4 The exposed rotating parts on the crane that may cause harm to people, such as open gears, couplings, and transmission shafts, should be equipped with protective covers. 5.4 Electrical equipment
5.4.1 The control circuit voltage should not exceed 42V. When using the flashlight direct control method, the protection level should not be lower than IP54. 5.4.2 Control circuit transformer
The control circuit transformer should have a grounding shield between the first and second windings. The transformer support should be grounded. 5.4.3 Power feeding device
5.4.3.1 Unlimited boom rotation
When the crane boom is designed to rotate without limit, a slip ring device should be used to ensure that the power feeding is not limited when the boom rotates. 5.4.3.2 Limited boom rotation
When the crane design only allows the boom to rotate within a limited range, a slip ring device is not required, but a block should be installed to prevent it from exceeding the limited range.
5.4.4 Cables and wires
5.4.4.1 Cable protection
The following methods should be adopted to prevent the cable from mechanical damage: a) wear a hose or conduit, or place it in a cable trough; b) lay it appropriately and use the crane structure to protect the cable; c) use an armored structure.
5.4.4.2 Wires
The wires should be multi-strand or flexible, and single-strand cables are not allowed. 5.4.4.3 Minimum cross section
The minimum cross section area of the wire used for power transmission of the hoisting mechanism motor shall not be less than 1.5mm2; the minimum cross section area of the wire used for control circuit and auxiliary line shall not be less than 1.0mm.
5.4.5 The shell of all electrical equipment on the crane must be effectively grounded, and the grounding shall be made of copper wire. Where non-copper conductors are used, their unit length resistance shall not exceed the permissible unit length resistance of copper conductors, and their cross section area shall not be less than 16mm. 5.5 Painting and appearance
5.5.1 Surface pretreatment
Before painting, any grease, dust, rust, loose oxide scale, loose rust and coating on the surface of the column and jib shall be removed, and a large number of base metal spots evenly distributed on the entire surface shall be exposed. For firmly attached oxide scale, rust, coating and protective layer, it is allowed to remain, reaching the St2 level specified in GB/T8923. The pretreated surface must be primed before rusting. 5.5.2 The surface of the crane should be painted evenly, brightly and in uniform color, without pinholes, sagging and bottom exposure. The primer should be applied first, followed by the topcoat. The thickness of each layer of paint film is 25-35um, and the total thickness is 75-105μm. 5.5.3 The adhesion of the paint film should meet the second-level quality requirements specified in GB/T9286. 6 Test
The crane test should follow the specifications and procedures specified in GB/T5905. 6.1 Visual inspection
6.1.1 The visual inspection shall include the inspection of conformity with the technical specifications and the inspection of the condition of all important parts, such as: 942
JB/T8906—1999
a) various mechanisms, electrical equipment, safety devices, brakes and controllers; b) metal structure of the crane and its connections;
c) all protective devices;
d) hooks or other load handling equipment and their connections; e) wire ropes, chains and their fastening joints: f) pulleys and their pins and fasteners;
g) lubricating oil level.
6.1.2 The inspection shall not be based on the assumption that it is necessary to remove parts, but it does not include opening covers used for normal operation and inspection, such as limit switch covers.
6.1.3 The inspection procedure shall include checking whether all required certificates are provided and checked. 6.2 Qualification test
Turn on the power supply, start the crane, gradually load it to the rated lifting capacity for 2 to 3 times, and perform motion tests and tests in all directions to verify whether the items listed in Table 7 meet the requirements of the design drawings and this standard. Qualification test items
Test load
Lifting height
Effective radius
Lifting mechanism running speed
Lifting mechanism lifting speed
Reliability of stopper
Deflection
Paint film adhesion
6.3 Deflection test
Measurement unit
Required value
Rated lifting capacity
Nominal value
(according to the design drawing)
6.3.1 Steps
After the crane is installed, the rated lifting capacity should be applied at the effective radius and the deflection should be measured. 6.3.2 Acceptance criteria
Limit deviation
There should be no self-rotation of the boom, or no uncontrolled operation of the trolley at any time, and the measured value of the deflection should not exceed the allowable deflection of each crane working level specified in Table 5. 6.4 Dynamic load test
6.4.1 Steps
The dynamic load test should be carried out when the crane is suspended with 1.1 times the rated lifting weight. The purpose of the dynamic load test is mainly to verify: a) the function of the crane mechanism and brake; b) the operating speed does not exceed 15% of the specified speed under the design voltage and rated frequency. The dynamic load test should be carried out separately on each crane movement, or when specified in the crane specification, the crane combined movement should be carried out in the position and configuration of the maximum load of the relevant mechanism. The test should include starting and stopping throughout each range of motion. 6.4.2 Acceptance criteria
Related components should be able to perform their functions, the crane mechanism or structural parts should not be damaged, and the joints should not be damaged or loose. 6.5 Static load test
6.5.1 Steps
JB/T8906
—1999
The purpose of the static load test is to verify the structural bearing capacity of the crane and its components. The test load should be 1.25 times the rated lifting capacity. When conducting the static load test, the maximum load, maximum bending moment and maximum axial force (if appropriate) should be applied to the main components of the crane at the effective radius.
The test load should be hoisted, and the operation of the various mechanisms should ensure that all gear teeth are tested under stress conditions. 6.5.2 Acceptance criteria
There should be no cracks that affect the function and safety of the crane, permanent deformation, paint peeling or obvious damage, and no loose or damaged joints. 6.6 The noise of the crane shall be measured in accordance with the provisions of GB/T3768. 7
Inspection rules
Crane inspection is divided into factory inspection and type inspection. 7.1 Factory inspection
Each crane shall be inspected by the quality inspection department according to this standard and drawings. After passing the inspection, a certificate of conformity shall be issued. Factory inspection items include the requirements specified in 5.3.1, 5.3.3, 5.3.4, 5.4.1, 5.4.2, 5.4.3, 5.4.4, 5.5.1, 5.5.2 and 5.5.3.
7.2 Type test
7.2.1 Type inspection items In addition to the factory inspection items, all inspection and test contents specified in 6.1, 6.2, 6.3, 6.4 and 6.5 are added.
7.2.2 Type tests should be carried out in any of the following situations: a) trial production and identification of new products or old products transferred to the factory for production; b) after formal production, when there are major changes in structure, materials and processes that may affect the performance of the crane; c) when the product is discontinued for more than one year and production is resumed; d) during normal production, when the monthly batch of cranes randomly selected for testing is less than 15 units, one unit shall be randomly tested every six months; e) when the inspection results are significantly different from those of the last type inspection; f) when the national quality supervision agency proposes a requirement for type inspection. 8.1 Each crane shall have a product label fixed in a conspicuous position, and its requirements shall comply with the provisions of GB/T13306. The label shall indicate: a) product model; b) product name; c) rated lifting capacity; d) lifting height; e) effective radius; f) slewing angle; g) working level; h) factory date and number; i) manufacturer name; ji) implementation standard number. 8.2 The packaging, transportation and storage of cranes shall comply with the relevant provisions of GB191 and GB/T13384. 8.3 When the crane leaves the factory, in addition to the information provided in Appendix B (the appendix of the reminder), the following information shall also be provided: a) Product certificate of conformity;
b) Product installation, use and maintenance instructions;
—1999
JB/T8906
c) Factory certificate of conformity of the manufacturer attached to the purchased electrical equipment; d) Packing list.
9 Quality assurance period
The product shall be able to work normally within 12 months from the date of use, but not more than 18 months from the date of shipment, under the conditions of proper storage, reasonable installation and correct use by the user.
JB/T8906-1999
Appendix A
(Reminder Appendix)
Information provided by the user in the inquiry and/or order contract The user should provide the following information in the inquiry and/or order contract: 1. Crane type
2. Hoist type
3. Rated lifting capacity (kg or t)
4. Required effective radius (R)
5. Height of the lower side of the boom or the required lifting height 6. Total headroom available
7. Slewing angle required
8. Crane operating class
a) When detailed information on the crane's intended operations and individual loads is available, the following should be provided: Utilization
Number of lifts per hour
Number of operating hours per day
Number of operating hours per month
Load (including weight of hoist)
Actual load (if known)
% of lifts close to rated load%% of lifts close to 75% of rated load%% of lifts close to 50% of rated load%% of lifts close to 25% of rated load%% Hoist weight
Expected design life
b) When insufficient information is available on the crane's intended operations, the user should ask the manufacturer to recommend the crane most suitable for the intended operating conditions.
9. Place of use: indoors or outdoors
10. Scope of electrical equipment supply
The following information should be provided if necessary:
a) Existing power supply
b) Voltage
c) Wires
Is there a neutral wire?
(nominal value)
If yes, is it grounded?
11. Basic conditions of the environment or climate
12. Is special paint or protective layer required?
13. Any special requirements in regulations or technology (e.g. hazardous areas)
The manufacturer should provide the following information (see Figure B1)1. Crane type
2. Hoist type
3. Crane working class
4. Rated lifting capacity
5. Effective radius (R)
6. Height of the lower side of the boom (UA)
7. Slewing angle (°)
8. Column diameter (g)
JB/T8906—1999
Appendix B
(Suggested Appendix)
Information provided by the manufacturer
9. Fixing installation drawings [foundation bolt size and pitch circle diameter (Pcd), wall bracket bolt size and center hole or size F] 10. Foundation size (L×D)
11. Reaction force Wa, Wh, W.
12. Moment M borne by the foundation.
13. Required power1 Each crane shall have a product label fixed in an obvious position, and its requirements shall comply with the provisions of GB/T13306. The label shall indicate: a) product model; b) product name; c) rated lifting capacity; d) lifting height; e) effective radius; f) slewing angle; g) working level; h) factory date and number; i) manufacturer name; ji) implementation standard number. 8.2 The packaging, transportation and storage of cranes shall comply with the relevant provisions of GB191 and GB/T13384. 8.3 When the crane leaves the factory, in addition to the information provided in Appendix B (the appendix of the reminder), the following information shall also be provided: a) Product certificate of conformity;
b) Product installation, use and maintenance instructions;
—1999
JB/T8906
c) Factory certificate of conformity of the manufacturer attached to the purchased electrical equipment; d) Packing list.
9 Quality assurance period
The product shall be able to work normally within 12 months from the date of use, but not more than 18 months from the date of shipment, under the conditions of proper storage, reasonable installation and correct use by the user.
JB/T8906-1999
Appendix A
(Reminder Appendix)
Information provided by the user in the inquiry and/or order contract The user should provide the following information in the inquiry and/or order contract: 1. Crane type
2. Hoist type
3. Rated lifting capacity (kg or t)
4. Required effective radius (R)
5. Height of the lower side of the boom or the required lifting height 6. Total headroom available
7. Slewing angle required
8. Crane operating class
a) When detailed information on the crane's intended operations and individual loads is available, the following should be provided: Utilization
Number of lifts per hour
Number of operating hours per day
Number of operating hours per month
Load (including weight of hoist)
Actual load (if known)
% of lifts close to rated load%% of lifts close to 75% of rated load%% of lifts close to 50% of rated load%% of lifts close to 25% of rated load%% Hoist weight
Expected design life
b) When insufficient information is available on the crane's intended operations, the user should ask the manufacturer to recommend the crane most suitable for the intended operating conditions.
9. Place of use: indoors or outdoors
10. Scope of electrical equipment supply
The following information should be provided if necessary:
a) Existing power supply
b) Voltage
c) Wires
Is there a neutral wire?
(nominal value)
If yes, is it grounded?
11. Basic conditions of the environment or climate
12. Is special paint or protective layer required?
13. Any special requirements in regulations or technology (e.g. hazardous areas)
The manufacturer should provide the following information (see Figure B1)1. Crane type
2. Hoist type
3. Crane working class
4. Rated lifting capacity
5. Effective radius (R)
6. Height of the lower side of the boom (UA)
7. Slewing angle (°)
8. Column diameter (g)
JB/T8906—1999
Appendix B
(Suggested Appendix)
Information provided by the manufacturer
9. Fixing installation drawings [foundation bolt size and pitch circle diameter (Pcd), wall bracket bolt size and center hole or size F] 10. Foundation size (L×D)
11. Reaction force Wa, Wh, W.
12. Moment M borne by the foundation.
13. Required power1 Each crane shall have a product label fixed in an obvious position, and its requirements shall comply with the provisions of GB/T13306. The label shall indicate: a) product model; b) product name; c) rated lifting capacity; d) lifting height; e) effective radius; f) slewing angle; g) working level; h) factory date and number; i) manufacturer name; ji) implementation standard number. 8.2 The packaging, transportation and storage of cranes shall comply with the relevant provisions of GB191 and GB/T13384. 8.3 When the crane leaves the factory, in addition to the information provided in Appendix B (the appendix of the reminder), the following information shall also be provided: a) Product certificate of conformity;
b) Product installation, use and maintenance instructions;
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JB/T8906
c) Factory certificate of conformity of the manufacturer attached to the purchased electrical equipment; d) Packing list.
9 Quality assurance period
The product shall be able to work normally within 12 months from the date of use, but not more than 18 months from the date of shipment, under the conditions of proper storage, reasonable installation and correct use by the user.
JB/T8906-1999
Appendix A
(Reminder Appendix)
Information provided by the user in the inquiry and/or order contract The user should provide the following information in the inquiry and/or order contract: 1. Crane type
2. Hoist type
3. Rated lifting capacity (kg or t)
4. Required effective radius (R)
5. Height of the lower side of the boom or the required lifting height 6. Total headroom available
7. Slewing angle required
8. Crane operating class
a) When detailed information on the crane's intended operations and individual loads is available, the following should be provided: Utilization
Number of lifts per hour
Number of operating hours per day
Number of operating hours per month
Load (including weight of hoist)
Actual load (if known)
% of lifts close to rated load%% of lifts close to 75% of rated load%% of lifts close to 50% of rated load%% of lifts close to 25% of rated load%% Hoist weight
Expected design life
b) When insufficient information is available on the crane's intended operations, the user should ask the manufacturer to recommend the crane most suitable for the intended operating conditions.
9. Place of use: indoors or outdoors
10. Scope of electrical equipment supply
The following information should be provided if necessary:
a) Existing power supply
b) Voltage
c) Wires
Is there a neutral wire?
(nominal value)
If yes, is it grounded?
11. Basic conditions of the environment or climate
12. Is special paint or protective layer required?
13. Any special requirements in regulations or technology (e.g. hazardous areas)
The manufacturer should provide the following information (see Figure B1)1. Crane type
2. Hoist type
3. Crane working class
4. Rated lifting capacity
5. Effective radius (R)
6. Height of the lower side of the boom (UA)
7. Slewing angle (°)
8. Column diameter (g)
JB/T8906—1999
Appendix B
(Suggested Appendix)
Information provided by the manufacturer
9. Fixing installation drawings [foundation bolt size and pitch circle diameter (Pcd), wall bracket bolt size and center hole or size F] 10. Foundation size (L×D)
11. Reaction force Wa, Wh, W.
12. Moment M borne by the foundation.
13. Required power
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