Some standard content:
ICS 53.020.20
Machinery Industry Standard of the People's Republic of China
JB/T 10381-2002
Flexible composite underslung cranes
Flexible composite underslung cranes2002-12-27 Issued
2003-04-01 Implementation
Issued by the State Economic and Trade Commission of the People's Republic of China Foreword,
2 Normative references
3 Types and basic parameters
3.1 Type of rail..
3.2 Typical examples of use
3.3 Basic parameters
4 Technical requirements
4.1 Environmental requirements,
Performance in use
Main components
4.5 Assembly.
4.6 Electrical equipment..
Safety and hygiene.
4.8 Appearance.
5 Test method
5.1 Visual inspection.
5.2 Qualification test
5.3 Load lifting capacity test,
6 Inspection rules
6.1 Factory inspection.
6.2 Type inspection.
7 Marking, packaging, transportation and storage.
7.1 Crane marking.
·2 Packaging, transportation, storage·
8 Warranty period.
Figure 1 Section of cold-rolled rail
Figure 2 Section of die-cast aluminum rail
Figure 3 Monorail suspension system.bzxZ.net
Figure 4 Single-beam suspension type,
Double-beam suspension type
Figure 6 Cantilever type.
Figure 7 Gantry type.
Figure 8 Stacking type,
Figure 9 Height difference between adjacent lifting points and profile rails
Figure 10 Height difference between crane rails
JB/T10381---2002
JB/T10381--2002
This standard is proposed by China Machinery Industry Federation. Foreword
This standard is under the jurisdiction of the National Technical Committee for Standardization of Hoisting Machinery. The drafting unit of this standard is Demag Hoisting Machinery (Shanghai) Co., Ltd. The main drafter of this standard is Xu Lei.
1 Scope
Flexible combined suspension crane
JB/T 10381-2002
This standard specifies the types, basic parameters, technical requirements, test methods and inspection rules of flexible combined suspension cranes. This standard applies to flexible combined suspension cranes (hereinafter referred to as cranes) with working levels A1 to A6, working environment temperatures of -25℃ to +40℃ and general purposes. Special cranes can also refer to it. This standard does not apply to cranes working under the following conditions: a) environments with explosion hazards and fire hazards; b) places with relative humidity greater than 85% and environments full of corrosive gases; c) lifting molten metal, toxic substances and flammable and explosive substances. 2 Normative references
The clauses in the following documents become the clauses of this standard through reference in this standard. For all dated referenced documents, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, parties to an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For any undated referenced document, the latest version shall apply to this standard. GB/T191-2000 Pictorial marking for packaging, storage and transportation (eqvISO780:1997) GB/T700-1988 Carbon structural steel (negDIN630:1987) GB/T3768-1996 Acoustics Sound pressure method for determining the sound power level of noise source Simple method using envelope measurement surface above the reflecting surface (eqvISO3746:1995) GB/T5905-1986 Crane test specifications and procedures (idtISO4310:1981) B/T9286-1998 Cross-cut test for paint and varnish film GB/T13384-1992 General technical conditions for packaging of electromechanical products JB/T5317.2-1991 Technical conditions for electric chain hoists JB/T8906--1999 Jib cranes (eqvBS7333:1990) 3 Types and basic parameters
3.1 Rail type
The basic component of the metal structure of a crane is a combinable cold-rolled steel rail or die-cast aluminum alloy rail (hereinafter referred to as the rail). The rail can have a variety of cross-sectional forms, such as Figure 1 and Figure 2. 3.2 Typical use examples
The characteristic of a crane is that its metal structure is composed of rails. Different combinations of rails can form a variety of structural types: 3.2.1 A monorail suspension system in which the hoist runs on a single rail and can change the running direction through curves, forks, and turntables (Figure 3). Figure 1 Cold-rolled rail section
JB/T10381—2002
Figure 2 Die-cast aluminum rail section
Figure 3 Monorail suspension system
3.2.2 The hoist runs on a single rail, and the two ends of the single rail are suspended under the other two rails in a single-beam suspension type (Figure 4) 3.2.3 The hoist trolley runs on two rails, and the two ends of the two rails are respectively suspended under the other two rails in a double-beam suspension type (Figure 5).
Cantilever type with rail as cantilever frame (Figure 6)Gantry type with single or two rails as crossbeam (Figure 7)Stacking type with rail as crossbeam and column, with liftable, translational and rotating fork (Figure 8)Figure 4 Single-beam suspension type
Figure 6 Cantilever type
Basic parameters
Double-beam suspension type
Figure 7 Gantry type
The rated lifting capacity series of the crane is 50kg, 80kg, 125kg, 160kg, 200kg, 250kg, 315kg, 400kg, 500kg, 630kg, 800kg, 1t, 1.25t, 1.6t, 2t, 2.5t, 3.2t. 3.3.2 The span or the spacing between the lifting points of the crane is generally 0.7m to 12m. 3.3.3
The lifting speed of the crane is generally 0.5m/min to 10m/min. The lifting height of the crane is generally 2m to 8m. The cantilever length of the cantilever crane is generally 2m to 7m. 4 Technical requirements
4.1 Environmental requirements
Figure 8 Stacking type
JB/T10381—2002
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 appliances 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 (if it exceeds 1000m, the motor capacity should be checked). 4.1.3 The crane should generally work indoors. 4.2 Performance
4.2.1 The parameters related to the use of the crane should comply with 3.3 of this standard or the requirements put forward by the user in the order contract. 4.2.2 The static rigidity of the crane under full load is stipulated as follows: the vertical static deflection of the rail of the running hoisting trolley should not be greater than 1/250 of the span or the spacing between the hanging points. The vertical static deflection of the rail used as the running track of the crane should not be greater than 1/350 of the spacing between the two hanging points. The maximum vertical static deflection of the end of the rail of the cantilever crane should comply with the provisions of JB/T8906-1999. 4.2.3 The dynamic rigidity of the crane is generally not stipulated in the supply. The assessment is only carried out when the user has requirements for this. The assessment index for single-beam suspension, double-beam suspension and gantry cranes is that when the trolley is located in the middle of the span, the minimum full-load natural frequency of the rail should not be less than 2Hz. 4.2.4 When the trolley hoists the load and moves to the cantilever limit position at one end of the rail, the wheels at the other end of the rail are not allowed to have negative wheel pressure. 4.3 Materials
4.3.1 The material of the cold-rolled rail of the crane should be selected from the Q235 carbon structural steel with performance not lower than that in GB/T700-1988. 4.3.2 The metal material should have a certificate of conformity from the supplier, otherwise the manufacturer should conduct chemical analysis (except for Grade A steel) and mechanical property tests. 4.4 Main components
4.4.1 If the lifting mechanism uses an electric chain hoist, it should comply with the provisions of JB/T5317.2-1991. 4.4.2 The welding rod, welding wire and welding flux used for welding the rail should be compatible with the rail material. There shall be no obvious defects such as cracks, holes, solid slag inclusions, lack of fusion, lack of penetration, etc. visible on the outside of the weld. 4.4.3 The straightness of the rail shall be less than 0.75mm/m; the distortion of the rail shall be less than 0.1°/m. 4.4.4 The suspension points of the rails shall be connected flexibly and have a maximum free swing of less than 7°. High-strength screws shall be used for the suspension rods. The connecting bolts shall be high-strength bolts of not less than grade 8.8 and shall be equipped with safety anti-loosening devices. 4.5 Assembly
4.5.1 The vertical deviation of the rails shall be less than 0.3mm when they are connected. 4.5.2 The height difference C between each adjacent suspension point shall not exceed 10mm, and the height difference h between the suspension point and the rail 2m away from the suspension point shall not exceed 2mm (see Figure 9).
4.5.3 The deviation of the crane span shall not exceed 12mm4.5.4 On the same section perpendicular to the direction of crane operation, the height difference D between the crane rails shall not exceed ±0.2% of the crane span, and the maximum shall not exceed 10mm (see Figure 10). 3
JB/T 10381—2002
4.5.5 Buffers shall be installed at the ends of each rail. 4.5.6 The turnouts and turntables of the monorail suspension system should be equipped with devices to prevent the hoist from slipping. 2000
Figure 9 Height difference between adjacent suspension points and rails
Figure 10 Height difference between crane rails
4.5.7 The monorail suspension system where the hoist trolley slides by gravity must be equipped with a stopper on the track where the accumulation trolley runs, and a diverter must be installed at the trolley accumulation point.
4.6 Electrical equipment
4.6.1 The supporting electrical appliances should be selected to meet the requirements of the crane and should have a product certificate. 4.6.2 The feeding device can be conducted by cables or busbars. The selection of materials and specifications should ensure that the current carrying capacity and the internal voltage loss of the crane meet the requirements.
4.6.3 If two or more cranes are powered by the same power supply, each crane should be equipped with an isolating switch. 4.6.4 After all the electrical equipment of the crane is installed, the insulation resistance of the circuit to the ground shall not be less than 0.8M2, and shall not be less than 0.4M2 in a humid environment.
4.7 Safety and hygiene
4.7.1 The crane shall be equipped with an emergency power-off switch. The markings on the crane operating buttons shall be consistent with the running direction of the crane and the electric hoist. 4.7.2』
4.7.3 In the absence of other external sound interference, the noise generated by the crane under full load shall be measured at a distance of 1m from the electric hoist. When the rated load is less than 1t, the noise shall not be greater than 82dB (A); when the rated load is greater than or equal to 1t, the noise shall not be greater than 85dB (A). 4.8 Appearance
4.8.1 The topcoat of the crane shall be uniform, delicate, bright, complete and consistent in color, and shall not have defects such as roughness, paint leakage, paint mismatch, wrinkles, pinholes and severe sagging.
4.8.2 The paint film adhesion on the outer surface of the rail shall meet the first-level quality requirements specified in GB/T9286-1998. 4.8.3 The surface of the rail hanging point should be galvanized. 5 Test method
The crane test shall follow the specifications and procedures specified in GB/T5905-1986. 5.1 Visual inspection
The visual inspection shall include whether the specifications or conditions of all important components meet the requirements, such as: various mechanisms, electrical equipment, safety device control devices, metal structures and their connectors, rail hangers, hooks, chains, pulley blocks, etc. During the inspection, it is not necessary to disassemble any components, but the covers that should be opened during normal maintenance and inspection should be opened. The visual inspection shall also include checking whether the necessary documents have been submitted and reviewed. 5.2 Qualification test
5.2.1 When the power is turned on, all mechanisms should operate normally without any jamming. The control devices and safety devices should be sensitive and accurate. 5.2.2 After 2 to 3 times of gradual loading until the rated lifting capacity is reached, action tests and tests are carried out in all directions to verify whether the items listed in Table 1 meet the requirements of the design drawings and this standard. The method for measuring noise shall be in accordance with the provisions of GB/T3768-1996. 4
Lifting height
Lifting speed
Crane and trolley running speed
Braking slippage during braking when lowering the rated load Static rigidity measurement of the crane Static deflection of the mid-span of the profile rail Noise of the crane
Insulation resistance to ground of each circuit in the electrical equipment Condition of the profile rail hanging point
Paint film adhesion
5.3 Load lifting capacity test
5.3.1 Static load test
Unit of measurement
dB (A)
Required value
Nominal value (according to the design drawing)
≤V/100
See 4.2.2 of this standard
See 4.7.3 of this standard
See 4.6.4 of this standard
See 4.4.4 of this standard
See 4.8.2 of this standard
Limit deviation
JB/T10381—2002
Not less than the nominal value
V is the distance of stable lifting within 1min
The purpose of static load test is to test the structural bearing capacity of the crane and its components. The static load test of each lifting mechanism should be carried out separately. Before the test, the unloaded hoist should be parked in the middle of the span to determine the reference point for measuring the deflection of the profile rail. The lifting mechanism is loaded with 1.25 times the rated lifting weight, and slowly lifted to a height of 100mm to 200mm from the ground, and the suspension time is not less than 10 minutes. After unloading the load, check the deformation of the crane rail measurement reference point. Repeat this three times, and the third measurement of the rail shall not have permanent deformation.
After the test, if there are no cracks, permanent deformation, paint peeling or damage that affects the performance and safety of the crane, and there is no looseness or damage at the connection, the test result is considered to be qualified. 5.3.2 Dynamic load test
The purpose of the dynamic load test is mainly to verify the functions of the various mechanisms and brakes of the crane. The dynamic load tests of the various mechanisms of the crane should be carried out separately, and then the combined action test should be carried out. The lifting mechanism is loaded with 1.1 times the rated lifting weight. During the test, each action should be started and braked repeatedly within its entire range of motion, and the test load should not reverse when the suspended test load is started in the air. During the test, the operation interval should be reserved according to the continuous power-on rate of the motor of the machine, and the control should be carried out according to the operating procedures. Attention must be paid to limiting the acceleration, deceleration and speed within the normal working range of the crane. According to its working cycle, the test time should last at least 1 hour. If each component can complete its functional test, and no damage to the mechanism or components is found in the subsequent visual inspection, and no looseness or damage is found in the connection, then the test result is considered qualified. 6 Inspection rules
6.1 Factory inspection
6.1.1 Each crane shall be inspected for parts according to the requirements of 4.4 before leaving the factory. 6.1.2 Each crane shall be tested for empty operation after being assembled in the factory or on site, and each mechanism shall be started separately to run in the forward and reverse directions. The cumulative time of the test shall not be less than 5 minutes. 6.1.3 The quality inspection department of the manufacturer shall inspect the product item by item according to the requirements of Chapter 4 and Chapter 7 according to the product drawings, order contracts and this standard, and issue a product certificate to the user after the inspection is qualified. 6.2 Type inspection
6.2.1 Type inspection shall be carried out for finalized products when any of the following situations occur, and the number of inspection units shall not be less than 2 units: a) Trial type inspection for new products or old products transferred to factory production; b) After normal production, if there are major changes in structure, materials, and processes, which may affect the performance of the crane; c) When the product is resumed after being discontinued for more than two years; 5
JB/T 10381-—2002
When the factory inspection results are significantly different from the last type inspection; d)
e) When the national quality supervision and inspection agency puts forward the requirement for type inspection. 6.2.2 Type inspection is based on the factory inspection and adds the inspection and test contents specified in Chapter 5. 6.2.3 If the manufacturer does not have the conditions to conduct tests, type inspection shall be carried out at the user's site. 6.2.4 The cranes to be type-tested shall be designated by the quality inspection department or quality supervision and inspection agency of the manufacturer according to actual conditions and possibilities, and shall be allocated according to the type, lifting capacity, span size, working level, etc., so that they can gradually reach comprehensive assessment. 7 Marking, packaging, transportation and storage
7.1 Crane marking
7.1.1 A lifting capacity and tonnage plate shall be set in a conspicuous position on the crane, and the tonnage plate shall indicate: a) Rated lifting capacity:
Name of the manufacturer;
7.1.2 A crane sign shall be installed in a conspicuous position on the crane, and the content on the sign shall include: a) Product name;
b) Crane code or mark:
Manufacture date or production number;
Name of the manufacturer.
7.2 Packaging, transportation and storage
The packaging, transportation and storage of cranes shall comply with the relevant provisions of GB/T191-2000 and GB/T13384-1992. 7.2.1.
When the crane leaves the factory, the following documents shall be provided: a)
Crane qualification certificate:
Crane installation, operation and maintenance instructions:
Packing list:
Purchased parts shall be accompanied by the manufacturing qualification certificate and related information; e)
Other relevant technical documents.
8 Warranty period
The manufacturer shall guarantee that the supplied crane, under the condition of proper storage, correct installation and use by the user, can work normally within 12 months from the date of inspection and delivery, but not more than 18 months from the date of shipment, or according to the contract agreement. 6
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