JB/T 9008.2-1999 Technical requirements for wire rope electric hoists
Some standard content:
JB/T9008.2--1999
This standard is a revision of ZBJ80013.2--89 "Technical Conditions for Electric Wire Rope Hoists". During the revision, only editorial changes were made to the original standard, and the main technical content remained unchanged. This standard is part of the JB/T9008 "Electric Wire Rope Hoist" series of standards, which includes the following six parts: JB/T 9008. 1--1999
JB/T 9008.2--1999
JB/T 9008. 3---1999
JB/T 9008. 4-1999
JB/T 9008. 5-1999
JB/T 9008. 6-1999
Types and basic parameters of wire rope electric hoistsTechnical conditions for wire rope electric hoists
Conical rotor motors for wire rope electric hoistsWire rope electric hoists
Test methods
Wire rope electric hoists
Main circuit limiters
Technical conditions for acceptance of electrical control equipment for wire rope electric hoistsThis standard replaces ZBJ80013.2-89 from the date of implementation. This standard is proposed and managed by the National Technical Committee for Standardization of Hoisting Machinery. The responsible drafting unit of this standard: Tianjin Hoisting Equipment Co., Ltd. The main drafters of this standard: Zhou Yaohua, Shi Xuezheng, Lu Xuexi, Li Daozhong, Cui Zhenyuan, Fu Weigong. 204
1 Scope
Standard of the Machinery Industry of the People's Republic of China
Electric wire rope hoists
Technical conditions
Specification for electric wire rope hoistsJB/T 9008.2--1999
Replaces ZBJ80013.2--89
This standard specifies the main technical requirements, inspection rules, marking, packaging, transportation and storage requirements for electric wire rope hoists (hereinafter referred to as electric hoists).
This standard applies to electric hoists for general purposes, and the working level of its mechanism shall comply with the provisions of GB/T3811. Electric hoists for special purposes and electric hoists with voltages not complying with the provisions of 3.1.1 and rated frequency of 60Hz may also refer to this standard. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard was published, the versions shown were all valid. All standards are subject to revision and parties using this standard should investigate the possibility of using the most recent versions of the following standards. GB191—1990 Pictorial symbols for packaging, storage and transportation
GB/T699—1988 High-quality carbon structural steel
Technical conditions
GB/T700—1988 Carbon structural steel
GB/T1239.2--1989 Technical conditions for cold-rolled cylindrical helical compression springs
GB/T1348--1988 Ductile iron castings
Technical conditions for alloy structural steel
GB/T 3077--1988
GB/T3811--1983 Crane design specification GB/T4942.1--1985 Motor housing protection classification GB/T 4942.2--1993
GB/T 8918--1996
GB/T 9439-1988
GB/T 10051. 2--1988
GB/T 10095--1988
GB/T 13306—1991
GB/T 9008.1--1999
JB/T 9008.3—1999
JB/T 9008. 4—1999
JB/T 9008. 5—1999
JB/T 9008. 6--1999www.bzxz.net
3 Technical requirements
3.1 Basic requirements
Protection level of low-voltage electrical enclosures
Wire rope
Gray cast iron parts
Lifting hook
Technical conditions for straight handle hook
Precision of involute cylindrical gear
General technical conditions for packaging of electromechanical products
Wire rope electric hoist
Wire rope electric hoist|| tt||Wire rope electric hoist
Wire rope electric hoist
Wire rope electric hoist
Type and basic parameters approved by the State Machinery Industry Bureau on 1999-06-28
Using conical rotor motor
Test method
Main circuit limiter
Technical conditions for acceptance of electrical control equipment
Implementation on 2000-01-01
JB/T 9008.2--1999
3.1.1 The rated voltage of the main circuit of the electric hoist is three-phase AC 380V, the rated frequency is 50Hz, and the working environment temperature is (25~+40)C.
3.1.2 The protection level of the electric motor (except the fan cover), electrical devices and push button switches of the electric hoist shall comply with the provisions of IP54 in GB/T4942.1 and GB/T4942.2.
3.1.3 For electric hoists used to lift molten metal, fragile, dangerous and valuable items, the working level of the lifting mechanism should be appropriately improved, and necessary safety protection measures should be added.
3.1.4 Electric hoists using single-layer winding wire ropes must be equipped with rope guides, and their performance requirements should be: when the hook is lowered and there is no other external force on the wire rope, the wire rope can still be freely discharged from the rope outlet of the rope guide; when lifting and lowering the rated load, the wire rope can work normally when the deflection angle of the vertical plane of the drum axis is 3°. 3.1.5 The insulation resistance value of the electric hoist at room temperature shall not be less than 1.5MQ. 3.1.6 The ground connection resistance value shall not exceed 0.12.3.2 Performance in use
3.2.1 The type and basic parameters of the electric hoist shall comply with the provisions of JB/T9008.1. 3.2.2 The performance parameters and technical requirements of the lifting and running motors shall comply with the provisions of JB/T9008.3. 3.2.3 The performance and technical requirements of the control box, button device (flashlight) and limiter shall comply with the provisions of JB/T9008.6, and the main circuit limiter shall comply with the provisions of JB/T9008.5. 3.2.4 The allowable deviation of the lifting speed shall be ±5% of the nominal value (slow speed is not assessed). 3.2.5 The allowable deviation of the running speed shall be ±15% of the nominal value. 3.2.6 The allowable deviation of the lifting height shall be 5% of the nominal value. 3.2.7 When the lifting mechanism is subjected to a static load test, it shall be able to withstand a test load of 1.5 times the rated load. After the test, a visual inspection is carried out. Each load-bearing part should be free of cracks, permanent deformation and paint peeling, and each connection should be free of looseness. 3.2.8 When the lifting mechanism is subjected to a dynamic load test, it should be able to withstand a test load of 1.25 times the rated load; it should work normally during the test and brake reliably. A visual inspection is carried out after the test, and the requirements are the same as those specified in 3.2.7. 3.2.9 When the running trolley is subjected to a static load test, it should be able to withstand a test load of 1.5 times the rated load. After the test, the inspection requirements are the same as those in 3.2.7; when a 1/200 climbing test is performed under the rated load, no abnormal phenomenon is required during the operation. 3.2.10 Under the rated load, the braking slippage S ≤ V/100 (V is the distance of stable lifting within 1 minute under load). 3.2.11 Under the conditions of rated load and motor terminal voltage of 85% of the rated voltage, the operation of the motor and brake should be free of abnormal phenomena; and the motor must have residual magnetic pull. 3.3 Safety and Health
3.3.1 In addition to reliable operation, the limiter must also have the function of phase mismatch protection. 3.3.2 Noise:
a) When the lifting mechanism is working under rated load, the noise shall not exceed 85dB (A); b) When the operating mechanism is operating under no-load, the noise shall not exceed 80dB (A). 3.3.3 Temperature monitoring: The operating temperature of the thermal control element is 160C ± 10C or 170C ± 10C. 3.3.4 When equipped with a second brake, its function shall meet the following requirements: It does not work under normal circumstances: When the first brake fails, it can reliably support the load.
3.3.5 When equipped with an overload limiter, its function shall meet the following requirements. 3.3.5.1 Mechanical overload limiter:
a) The comprehensive error is not more than 8%;
b) The action load is not more than 1.15 times the rated load; c) When the action load is reached, the lifting power circuit can be automatically cut off. 3.3.5.2 Electronic overload limiter:
a) The comprehensive error is not more than 5%;
JB/T 9008.2-1999
b) The action load with delay is not more than 1.1 times the rated load; the action load without delay is 1.25 times the rated load; c) When the action load is reached, the lifting power circuit can be automatically cut off. 3.4 Life
3.4.1 Life
a) The lifting mechanism (fixed electric hoist) performs cyclic lifting and lowering operation under the rated load of the mechanism working level M4. If the lifting speed is single speed, the test operation time should be no less than 800h: if the lifting speed is double speed (double winding, double motor group), its fast operation time should be no less than 800h, and its slow operation time should be no less than 400h. After the test, all wear parts can continue to be used (except wire rope). b) The motor and reducer in the lifting mechanism should be able to withstand 1 million no-load impact tests under combined conditions. The running motor adopts the method of inertia wheel and should be able to withstand 200,000 impact tests. During the impact test, the electric hoist's self-equipped electrical device should be used. During the test, maintenance can be carried out according to the requirements of the product manual, but no parts or components shall be replaced. The wear of the brake pad of the running motor after 200,000 tests should not exceed 1.5mm.
3.4.2 The temperature rise of the motor stator winding should comply with the provisions of JB/T9008.3. 3.5 Other (parts) requirements
3.5.1 The lifting hook should comply with the provisions of GB/T10051.2. 3.5.2 Line contact wire rope should be used first, and its structural type should comply with the rope 18×7 and rope 6×37 in GB/T8918; the nominal tensile strength of the wire rope shall not be less than 1570MPa. 3.5.3 After the test, check the weight Q (mg) of the debris in the reducer of the lifting mechanism (except the reducer of the slow drive device), which shall not exceed the weight calculated by formula (1):
Where: G——reducer weight, kg:
2.5--coefficient, mg/kg.
3.5.4 The reducer shall not have oil leakage.
3.6 Materials
3.6.1 The performance of the steel plates and profiles used to manufacture the reel, reel shell, trolley wall panels and other important load-bearing parts shall not be lower than Q235A or Q235B in GB/T700 when the working environment temperature is (-20~~+40)C, and shall not be lower than Q235B when the working environment temperature is (-21~-25)C, and the low-temperature impact energy (Ak) shall not be less than 27J; when hot-rolled or cold-drawn steel pipes are used as the raw material of the reel, the material performance shall not be lower than 10 steel in GB/T699.
3.6.2 The performance of the gear material of the lifting mechanism shall not be lower than 20CrMnTi or 40MnB in GB/T3077; the performance of the gear material of the running mechanism shall not be lower than 45 steel in GB/T699. 3.6.3 The performance of the reducer housing, cover and pulley materials shall not be lower than HT200 in GB/T9439. 3.6.4 The performance of the guide rope nut and cast wheel materials shall not be lower than QT500-7 in GB/T1438. 3.6.5 The performance of the forged wheel material shall not be lower than 45 steel in GB/T699. 3.6.6 The gear accuracy of the lifting mechanism reducer shall not be lower than 8-8-7 in GB/T10095; the open gear shall not be lower than 9. 3.6.7 The compression spring of the brake shall comply with the provisions of GB/T1239.2, and its accuracy level is 2. 3.7 Painting and appearance
The electric hoist must be painted with primer first and then with topcoat (at least 2 times) before leaving the factory. After drying, the thickness of each layer of paint film shall not be less than 25um, and the total thickness of the paint film shall not be less than 75um. The paint should be evenly painted, bright, and of uniform color, without any paint leakage. Anti-rust measures should be taken for exposed surfaces that are not painted (or plated). The coating film adhesion is checked by the cross-cut method (the blade spacing is 2mm). A small amount of flakes are allowed to peel off at the intersection of the cuts, and the peeling area should not exceed 5%.
4 Inspection rules
The inspection of electric reeds is divided into factory inspection, type inspection and life inspection. The test method should comply with the provisions of JB/T9008.4, and the mechanism working level M4 should be used as the test standard condition. The inspection items are stipulated as follows: 207
4.1 Factory inspection
JB/T9008.2--1999
Each electric hoist must pass various inspection tests before it can leave the factory, and the factory products must be accompanied by a product certificate. 4.1.1 General inspection
Each electric hoist should be inspected for the following contents before testing according to the requirements of the order contract or production plan: a) Structural form;
b) Specification model:
c) Power supply;
d) Temperature monitoring (only check the conductivity); e) Insulation;
f) Grounding;
g) Correctness of the fixation and winding of the wire rope end; h) Reducer oil level, and whether there is oil leakage; i) Whether the hook rotates flexibly;
i) The quality of the exterior paint and various signs, etc. 4.1.2 No-load test:
a) Record the voltage and current of each phase;
b) The function of the limiter and the phase-shift protection function; c) The assembly quality of the rope guide;
d) Visually check the axial movement of the motor shaft; e) The no-load noise of the electric trolley.
4.1.3 Rated load test:
a) Voltage reduction test (the residual magnetic pull is measured in the type test); b) Determine the braking slippage;
Note: When there is a second brake, its function should also be checked. c) Determine the lifting speed;
d) Determine the lifting mechanism noise,
e) Record the current, voltage and power (done in the type inspection). 4.1.4 Dynamic load test
Perform the test according to the requirements of 3.2.8.
4.1.5 When equipped with an overload limiter, its function should be checked according to the requirements of 3.3.5. 4.2 Type inspection
Type inspection shall be carried out for any of the following conditions: a) Trial determination and appraisal of new products or old products for transfer to factory production; b) After formal production, if there are major changes in structure, materials, and processes that may affect product performance; c) During normal production, at least one electric hoist and two motors for each base model must be inspected once a year;
Note: If the type inspection conducted by the national quality supervision agency is proved by the conclusion, it can be exempted from inspection within one year. d) When the product resumes production after a long-term suspension (referring to more than one year); e) When the factory inspection results are significantly different from the last type inspection; f) When the national quality supervision agency and the user unit put forward the requirement for type inspection. In addition to all factory inspection items (dynamic load test has other requirements), the type inspection should also include the following inspections (if necessary, additional items can be added according to user requirements).
Note: For electric hoists with electric trolleys, when dynamic load tests are carried out under the above conditions a) and b), the trolley should also be tested for a round trip of no less than 10 minutes.
4.2.1 General inspection:
a) Measure the overall dimensions;
b) Correctness of assembly of each part;
c) Lifting height.
4.2.2 Determination of running speed and climbing test. 4.2.3 Lifting and running motor test.
JB/T 9008.2—1999
4.2.4 Measure the residual magnetic pull of the motor under reduced voltage conditions. 4.2.5 Measure the temperature rise of the motor and check the operating temperature of its temperature monitoring. Note: When testing and appraising new products, the temperature rise of the lifting motor under various working levels of the mechanism and the running motor under various load durations should be measured.
4.2.6 Measure the starting and braking time of the hoisting motor. 4.2.7 Check the control box, button device and limiter. 4.2.8 Check the protection level.
4.2.9 Check the coating and appearance, paint film thickness and its adhesion. 4.2.10 Main parts:
a) Wire rope inspection;
Note: Inspection can be exempted when there is a manufacturer's certificate. b) Lifting hook inspection;
c) Hoisting reducer gear pair manufacturing accuracy inspection. 4.2.11 Check the debris in the hoisting reducer. 4.2.12 Static load test shall be carried out according to the requirements of 3.2.7. 4.2.13 Dynamic load test shall be carried out according to the test load specified in 3.2.8 and the working cycle mode of M4 level. The test shall be carried out for at least 1 hour. 4.3 Life test
All items a), b), d) in the type inspection must be subject to life test. During normal mass production, at least one electric motor of each basic model shall be selected every three years for life test; another combination of a lifting motor and a reducer, and one running motor shall be selected for impact test. The function and quality of the overload limiter shall be inspected during the life test. 5 Marking, packaging, transportation and storage
5.1 Each electric hoist should be equipped with a sign in a conspicuous position, and its requirements should comply with the provisions of GB/T13306. The sign should generally indicate the following:
a) manufacturer's name;
b) product name;
c) trademark;
d) product model;
e) date of publication;
f) factory number;
g) lifting capacity,
h) lifting height;
i) lifting speed:
j) mechanism working level;
k) operating speed;
1) others.
2 The following signs should be on the hook device:
a) lifting capacity;
b) mechanism working level;
c) manufacturer's name or trademark;
d) others.
JB/T9008.2—1999
5.3 Each electric hoist that is packed and shipped shall be accompanied by the following documents: a) Product instruction manual;
b) Product certificate of conformity;
c) Spare parts catalog (which can be compiled in the instruction manual); d) Packing list;
e) Others.
5.4 The packaging of electric hoists shall comply with the provisions of GB/T13384. 5.5 The packaging, storage and transportation icons and signs shall comply with the provisions of GB191. 6 Warranty period
The manufacturer shall ensure that the electric hoists supplied by the user can 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. 210
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