JB/T 3695-1994 Electric hoist bridge crane

This standard specifies the types, basic parameters, technical requirements, test methods and inspection rules of electric hoist bridge cranes. This standard is applicable to cranes with working levels A3~A5, working in general environments, and rated lifting capacity of 5~32t. JB/T 3695-1994 Electric hoist bridge crane JB/T3695-1994 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
Electric Hoist Bridge Crane
Subject Content and Scope of Application
JB/T3695-94
Replaces JB3695--84
This standard specifies the type, basic parameters, technical requirements, test methods and inspection rules of electric hoist bridge crane (hereinafter referred to as crane).
This standard applies to cranes with working levels A3 to A5, working in general environments, and with a rated lifting capacity of 5~~~32t. 2 Reference standards
GB 191
GB1591
GB3323
GB 3768
GB 3811
GB 4205
GB5905
GB6067
GB6164
GB 6417
GB7592
GB8923
GB9286
Pictorial marking for packaging, storage and transportation
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
Design specification for cranes
Standard movement direction of operating parts for controlling electrical equipmentTest specifications and procedures for cranes
Safety regulations for lifting machinery
Crane buffers
Classification and description of defects in metal fusion weldsLimited dimensions of general bridge cranes
Rust grade and rust removal grade of steel surfaces before paintingCross-cut test for paint and varnish films
GB 10183
Manufacture and track installation tolerances for bridge and gantry cranesGB/T13306Signages
GB/T 13384
GB/T 14407
JB 1152
General technical conditions for packaging of electromechanical products
Technical conditions for driver's cabs of general-purpose bridge and gantry cranesUltrasonic flaw detection of butt welds of boilers and steel pressure vessels9Paint colors and safety signs for mining, engineering, lifting and transportation machinery productsJB2299
5Electronic control equipment for cranes
JB 4315
JB/T6391.1 Types and basic parameters of sliding transmission devices for cranesJB/T6392.1 Types and dimensions of crane wheels, matching of tread shapes with railsJB/T6392.2 Technical conditions for crane wheelsJB/ZQ4000.3 General technical conditions for welded partsZBJ19027 QS type reducer for cranes
ZBJ80013.2 Technical conditions for wire rope electric hoistsApproved by the Ministry of Machinery Industry of the People's Republic of China on July 18, 1994 and implemented on July 1, 1995
3 Types and basic parameters
3.1. Type
JB/T3695--94
Crane can be divided into two types according to the operation mode: ground operation and cab operation (see Figure 1). 122
3.2 Basic parameters
3.2.1 The rated lifting capacity of the crane (code: Gn, unit: t) is stipulated as follows: 5, 6.3, 8, 10, 12.5, 16/3.2, 20/5, 25/6.3, 32/8. 3.2.2 The span of the crane (code: S, unit: m) is stipulated as follows: 10.5, 13.5, 16.5, 19.5. 22.5, 25.5. 3.2.3 The lifting height of the crane (code: H, unit, m) is stipulated as: 6~18. 3.2.4 The working speeds of various mechanisms of the crane should preferably adopt the values ​​specified in Table 1. Table 1
Lifting mechanism
Trolley operating mechanism
Cart operating mechanism
Ground operation
Driver's cab operation
0.25.0.35.0.4,0.50.63,0.8,2.5,3.2,4.5,6.3,8,1020～30
70～80
Note: If there is a double speed requirement for the trolley operating speed operated by the driver's cab, the supply and demand parties shall negotiate to resolve it. 3.3 Crane marking
3.3.1 Model identification method
LHOOOO
Operation mode
Working level
Span, m
D for ground operation; when operated in the driver's cab, K for open type and B for closed type Rated lifting capacity, t
Product code
3.3.2 Marking example
A crane with rated lifting capacity of 5t, span of 16.5m, working level A3 and operated with a closed driver's cab should be marked: 342
3.4 ​​Limit size
JB/T3695—94
Crane LH5-16.5A3B JB/T 3695--94 The safety dimensions C6 and Ch between the crane and the building should comply with the provisions of GB7592. 4 Technical requirements
The design and manufacture of cranes 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 motors and electrical appliances is 10% of the rated voltage, and the lower limit (at peak current) is 15% of the rated voltage. Among them, the internal voltage loss of the crane shall comply with the provisions of GB3811 for general-purpose bridge cranes. 4.1.2
The installation of the crane running track shall comply with the provisions of GB10183. The altitude of the crane installation and use site shall not exceed 2000m (the motor capacity shall be checked when it exceeds 1000m). There shall be no flammable, explosive and corrosive gases in the working environment. Molten metal, toxic substances and flammable and explosive substances shall not be hoisted. The maximum wind pressure of outdoor cranes in non-working state is 800Pa (equivalent to 11-force wind). Climate conditions for normal operation of cranes
4. 1. 7. 1
For cranes working indoors
The ambient temperature shall not exceed +40C, and the average temperature within 24 hours shall not exceed +35C: the ambient temperature shall not be lower than -5C;
The relative humidity shall not exceed 50% at a temperature of +40C. 4.1.7.2For cranes working outdoors
The ambient temperature shall not exceed +40C, and the average temperature within 24 hours shall not exceed +35C; the ambient temperature shall not be lower than -25°C,
The relative humidity when the ambient temperature does not exceed +25°C is allowed to temporarily reach 100%; the working wind pressure shall not be greater than: 150Pa (equivalent to 6-force wind) in inland areas and 250Pa (equivalent to 7-force wind) in coastal areas. 4.2 Performance
4.2.1The lifting capacity of the crane shall be able to reach the rated lifting capacity. 4.2.2 The static rigidity of the crane is stipulated as follows: when the trolley is in the middle of the span and fully loaded, the vertical static deflection caused shall not be greater than S/800. 4.2.3 The dynamic rigidity of the crane is stipulated as follows: when the trolley is in the middle of the span and fully loaded, the natural frequency of the main beam shall not be less than 2Hz (only when the user or the design itself has requirements for this item, it shall be checked). 4.3 Materials
4.3.1 The material of the metal structural parts of the crane shall be GB700 for carbon structural steel and GB1591 for low alloy structural steel. The grade shall not be lower than that specified in Table 2.
Component category
Working environment temperature
Working level
Steel grade
8>20mm
Important components"
Not less than →20℃
Q235-B
Note: 1) Important components refer to main beams, end beams and trolley frames. Less than -20～-25 C
Q235-D
2) The impact energy is required to be not less than 27J at -20℃, which shall be proposed or supplemented when ordering steel. Other components
Not less than -25℃
A3～A5
4.3.2 The steel of important components shall be subjected to surface rust removal treatment by shot blasting before painting, and shall reach the Sa2% level specified in GB8923, 343
JB/T 3695
The rest of the components should reach Sa2 or St2 (manual rust removal). 4.4 Main components
4.4.1 The crane should use components that meet or have performance not lower than the following standards: Cylindrical wheels JB/T6392.1~~6392.2
Buffer GB6164
Electric hoist ZBJ80013.2
Electronic control equipment JB4315
Reducer
ZBJ19027
Driver's cab
GB/T 14407
4.4.2 The reference end face of the wheel after assembly (the surface is processed to a depth of 1.5mm round groove as mark) shall not exceed the requirements of Table 3.
Wheel diameter, mm
End face round runout +μm
4.5 Welding
160~250
>250~～500
>500～700
4.5.1 Welded parts shall comply with the relevant provisions of JB/ZQ4000.3. The butt welds of flange plates and web plates in the main tension zone shall be BS grade, and the longitudinal fillet welds between the upper flange plate and the web plate shall be BK grade. 4.5.2 There shall be no obvious defects visible to the naked eye in the external inspection of welds. These defects are classified as follows according to GB6417: cracks, holes, solid inclusions, lack of fusion and lack of penetration, shape defects and other defects other than the above. 4.5.3 The butt welds of flange plates and web plates in the tension zone of the main beam shall be subjected to non-destructive testing. When performing radiographic inspection, it shall not be lower than Grade I specified in GB3323; when performing ultrasonic inspection, it shall not be lower than Grade I specified in GB1152. 4.6 Bridge
4.6.1 The main beam shall have an upward camber, and the upward camber at the mid-span shall be (0.9/1000～1.4/1000)S, and the maximum upward camber shall be controlled within the range of S/10 at the mid-span. For bridge inspection conditions, see Appendix A (Supplement). 4.6.2 The horizontal bending value of the main beam shall not be greater than L1/2000 (L is the measured length from the first large rib plate at both ends, measured at the large rib plate about 100mm away from the upper flange plate), but when S≤19.5m, the horizontal bending value shall not be greater than 5mm; when S≥19.5m, the horizontal bending value shall not be greater than 8mm, and can only be concave to the outside of the main beam. 4.6.3 The local flatness of the web of the main beam, when tested with a 1m ruler, should not exceed 0.7 in the area within H/3 of the upper flange plate; the rest of the area should not exceed 1.2 (see Figure 2)
Upper flange plate
4.6.4 The horizontal deflection value of the upper flange plate of the main beam C≤B/200 (see Figure 3). 344
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4.6.5 The vertical deflection value of the web of the main beam h≤H/200 (see Figure 4). Figure 3
4.6.6 The diagonal deviation of the bridge: The diagonal difference measured with the reference point of the wheel is lS, a S, ≤5mm (see Figure 5). This value is allowed to be measured and controlled before the running mechanism is assembled. 3
4.6.7 The height difference Ah between the two trolley tracks on the same section perpendicular to the trolley running direction (see Figure 6) shall meet the following requirements:
When K≤2m, Ah≤3mm; 2m10m, b≤6+0.2(S-10)mm; and bmax=10mm. uwrs
4.7 Assembly
4.7.1 The limit deviation AS of the crane span S (see Figure 1) shall comply with the following provisions: 2m
When S≤10 m, 4S=±2mm; When S>10 m, AS=±[2+0.1(S-10)Jmm. For the crane span test conditions, see Appendix A (Supplement). 4.7.2 The limit deviation of the wheelbase K (see Figure 10) measured by the trolley wheels is ±2mm. 4.7.3 The diagonal difference of the trolley is ld-d, /≤3mm (measured from the reference point of the wheel, see Figure 10). 346
JB/T3695
4.7.4 When the wheels are suspended (see Appendix A for conditions), measure the deflection of the wheels of the crane and trolley in the vertical plane. The axis deflection angle α (see Figure 11) should be controlled within the following range: -0.0005≤tga≤0.0025
4.7.5 The horizontal deflection of the wheels of the crane and trolley should comply with the following provisions: The tangent value of the deflection angle of the wheel axis (see Figure 12) should comply with the provisions of Table 4. Table 4
Working level
M3, M4
4.7.6 The isotropic difference of the wheels under the same end beam should not be greater than 2mm (see Figure 13). Figure 13
4.8 Electrical equipment
4.8.1 General requirements
JB/T3695—94
4.8.1.1 Generally, AC transmission and AC control systems should be used. 4.8.1.2 The selected electric control equipment of the crane or the self-designed control equipment should comply with the relevant provisions of GB3811 and JB4315. 4.8.1.3 Conical rotor motors (single and double speed) should comply with the relevant provisions of ZBJ80013.3. 4.8.1.4 The complete set of resistors for cranes should be standard products. When self-designed, they must comply with the requirements of 5.3 of GB3811. 4.8.1.5 The requirements for operating equipment are as follows:
For cranes operated in the driver's cab, a linkage control console or upright controller should be used; a.
For cranes operated on the ground, a flashlight switch should be used for control, and the control voltage should be 36V or 42V; b.
The installation and layout of the operating equipment should ensure that the movement direction of the handle complies with the relevant provisions of GB4205; c
d. The main power supply should be easily and reliably connected and disconnected in the driver's cab and on the flashlight switch. 4.8.1.6 Other electric control equipment and components should generally be crane-specific equipment or products that meet the requirements of cranes. 4.8.2 Feeding device
4.8.2.1 The trolley feeding device should adopt a cable pulley type. If the user has special requirements, it can be negotiated with the manufacturer. 4.8.2.2 When the trolley uses a cable pulley for electricity, the following requirements shall be met: a. A fixed junction box shall be set at the appropriate position of the bridge frame and the trolley frame; a.
Another traction rope shall be set to ensure that the cable is not stressed during the operation of the trolley; b.
c. The cable pulley shall be flexible.
4.8.2.3 It is recommended to use the sliding transmission device in JB/T6391.1 for trolley power feeding. A flat collector or a mobile cable may also be used. 4.8.2.4 The design of the feeding device shall meet the requirements of 5.6 in GB3811. 4.8.3 Installation of electrical equipment
4.8.3.1 The installation base frame of the electrical equipment must be firm, and its verticality shall not be greater than 12/1000. Relative movement shall not occur during the operation of the crane.
4.8.3.2 The electrical equipment installed on the crane bridge for indoor use shall have no exposed live parts, and its minimum protection level shall be IP10. 4.8.3.3 The electrical equipment installed on the crane bridge for outdoor use shall have no exposed live parts. In unsheltered places, its shell protection level shall not be lower than IP33, and in sheltered places, its protection level may be appropriately reduced. 4.8.3.4 The electrical equipment installed in various parts of the crane shall be convenient and safe to repair, and a passage of more than 500mm shall be left in front of the equipment. 4.8.3.5 Resistors with four boxes or less can be directly stacked. 4.8.3.6 The exposed live parts of the crane's large and small car feeder and the minimum gap between them and the metal structure shall be greater than 30mm. 4.8.4 Wire laying
4.8.4.1 The wire must be a copper core multi-strand rubber insulated wire. The unsheathed copper core multi-strand plastic insulated wire can be used in the driver's cab and control panel.
4.8.4.2 The movable cables on cranes are generally made of nitrile polyvinyl chloride flat flexible cables, rubber sheathed flat flexible cables, heavy rubber sheathed flexible cables or marine flexible cables.
4.8.4.3 The crane must use multi-strand single-core wires with a cross-section of not less than 1.5mm or multi-strand multi-core wires with a cross-section of 1mm2. The cross-section of the connecting wires of electronic devices, sensor elements, etc. is not specified. 4.8.4.4 The wires should be laid in wire troughs or pipes. No joints are allowed in the pipes. The inlet and outlet wires of the pipes should have wire protection measures and rain and water accumulation prevention measures. In places where it is inconvenient to lay wire troughs and wire pipes or where there is relative movement, the wires can be laid through metal hoses. The cables can be laid directly, and protective measures should be taken in places with mechanical damage, chemical corrosion, and oil immersion. 4.8.4.5 Wires of different mechanisms and voltage levels should be separated as much as possible when passing through pipes, and lighting wires should be set separately. 4.8.4.6 Single-core wires carrying an AC current of more than 25A are not allowed to pass through metal pipes alone. 4.8.4.7 A junction box should be set outside the connection or branch point of the wire, and the junction box should have sufficient lead space. 4.8.4.8 When the cable is fixedly laid, the bending radius shall not be less than 5 times the outer diameter of the cable, and the bending radius of the mobile cable shall not be less than 8 times the outer diameter of the cable.
JB/T3695—94
4.8.4.9 Both ends of the wire shall have permanent identification marks consistent with the circuit diagram or wiring diagram and connectors that will not fall off for connection. 4.8.4.10 All wires are not allowed to have intermediate joints. Lighting wires are allowed to be connected with transition terminals near equipment. Wires should be bundled in places where wires are concentrated, such as in wire troughs and under the floor of the driver's cab, and marked with wire bundle numbers consistent with the wiring diagram. 4.8.5 Lighting and others
4.8.5.1 There should be lighting devices in the crane driver's cab and under the bridge, and anti-vibration measures and convenient maintenance should be considered. 4.8.5.2 The power supply of fixed lighting and signals on the crane should not exceed 220V. The voltage of portable lighting devices should not exceed 36V, and a special isolation transformer must be used to provide power. It is strictly forbidden to use metal structures as the circuit of the lighting circuit. The crane should have sockets for portable lighting.
4.8.5.3 Lighting and signals should have dedicated circuits, and the power supply should be tapped from the main circuit breaker (or main knife switch) incoming line terminal. When the main circuit breaker is disconnected, the lighting and signal circuits will not be disconnected. Short-circuit protection should be set for lighting, signal circuits and their branch circuits. 4.8.5.4 All electrical equipment on the crane, metal casings that are not normally energized, metal wire pipes and one end of the low-voltage side of the safety lighting transformer, etc. must be reliably grounded.
4.8.5.5 In general, there should be a reliable electrical connection between the crane wheels and the track. The user is responsible for the grounding of the crane track. When the user requires improved grounding reliability, or in particularly harsh environmental conditions, a grounding wire (or grounding core) should be added, or other measures should be taken to improve grounding reliability.
4.9 Safety and hygiene
4.9.1 The safety protection devices on the crane should comply with the provisions of GB6067. 4.9.2 The insulation resistance of each circuit in the crane's electronic control equipment to the ground should not be less than 0.8MQ2 in a general environment, and should not be less than 0.4 M2 in a humid environment.
4.9.3 Excluding other external sound interference, the noise generated by the crane should be measured at the driver's seat for operation in the cab, and its value should not exceed 85dB (A) (the closed cab should be measured with the window open). For ground control, it should be measured 6m below the lifting mechanism, and its value should also not exceed 85 dB (A).
4.10 Appearance
4.10.1 The crane topcoat should be even, fine, bright, complete and uniform in color, and should not have defects such as roughness, paint leakage, paint mismatch, wrinkles, pinholes and severe sagging.
4.10.2 The paint film thickness is 25~35μm per layer and the total thickness is 75~105μm. 4.10.3 The paint film adhesion should meet the first-level quality requirements specified in GB9286. 4.10.4 The paint color should generally comply with the provisions of JB2299. Special requirements can be negotiated by the supply and demand parties. 5 Test method
The crane test should follow the specifications and procedures specified in GB5905. 5.1 Visual inspection
The visual inspection shall include the specifications (such as span, etc.) and status of all important parts, such as: various mechanisms, electrical equipment, safety devices, control devices, lighting and signal systems, crane metal structures and their connections, ladders, driver's cabs and walkways, as well as all protective devices.
During the inspection, it is not necessary to disassemble any parts, but the covers that should be opened during normal maintenance and inspection, such as limit switch covers, should be opened. The visual inspection shall also include checking whether the necessary random documents are complete and have been reviewed. 5.2 Qualification test
After 2~~3 times of gradual loading until the rated lifting weight (the test load allows a deviation of ±1%), the action test and test in each direction are carried out when the voltage fluctuation is =i.% and the nominal speed of the motor to verify whether the items listed in Table 5 meet the requirements of the design drawings and this standard. The method for determining noise shall comply with the relevant provisions of GB3768. 349
Load lifting height (or load lifting range)Hook lateral limit position
Load lifting speed
Load lowering speed
Crane operating speed
Trolley operating speed
Braking distance of load lowering
Static rigidity of craneMeasuring static deflection of main beam at mid-spanInsulation resistance to ground of each circuit in electric control equipmentNoise of crane
Reliability of limiter
5.3 Load lifting capacity test
5.3.1 Static load test
JB/T3695--94
Unit of measurement
Required value
See design drawing
Sc≤V%(V-1 min The measured stable rising distance of the hook) is as follows: See Article 4.2.2 of this standard. See Article 4.9.2 of this standard. See Article 4.9.3 of this standard. Accurate parking is possible. Allowable deviation. The test load is 1.25Gn. The load should be gradually added and lifted to 100-200mm from the ground. The hanging time shall not be less than 10min. Before the static load test of the main hook, the crane should be parked in the middle of the span, the base push point should be determined, and after the load is removed, check whether there is permanent deformation at the reference point of the crane main beam. After repeating this three times, there shall be no permanent deformation. Drive the trolley to the end of the span and check that the camber of the main beam should not be less than 0.7 S/1 000.
After the test, if no cracks, permanent deformation, paint peeling or damage that affects the performance and safety of the crane are found, and the connection is not loose or damaged, the test result is considered good. 5.3.2 Dynamic load test
During the dynamic load test, the interval time should be left according to the power-on duration of the crane motor, and the control should be carried out according to the operating procedures. It must be noted that the acceleration, deceleration and speed are limited to the normal working range. The test load is 1.1G. The dynamic load test of each mechanism of the crane should be carried out separately first, and then the joint action test should be carried out, and the two mechanisms should be started at the same time (but the main and auxiliary hooks should not be started at the same time). During the test, each action should be started and braked repeatedly within its entire operating range. When the suspended test load is lifted in the air, the test load should not have reverse action. According to its working cycle, the test time should last at least 1h. If each component can complete its functional test, and no damage to the components of the mechanism or structure is found in the subsequent visual inspection, and there is no looseness or damage at the connection, the test result is considered good. 6 Inspection rules
6.1 Factory inspection
6.1.1 Each crane shall be inspected before delivery. The inspection contents shall include all items except Chapter 5 and Chapter 8 of this standard. 6.1.2 The crane shall be pre-installed at the manufacturer. During pre-installation, the cab of the bridge part may not be installed and the running wheels shall be suspended. 6.1.3 Carry out an idling test. Start each mechanism separately and run it in the forward and reverse directions. The cumulative time of the test shall not be less than 5 minutes. 6.1.4 The quality inspection department of the manufacturer shall inspect the product item by item according to the product drawings, order contracts and this standard. Only after the inspection is qualified shall the product be allowed to leave the factory and a product certificate of conformity shall be issued to the user. 6.2 Type inspection
6.2.1 Type inspection shall generally be carried out in any of the following situations: a. Trial production and finalization of new products or old products transferred to the factory for production; 350
JB/T3695-94
b. After formal production, if there are major changes in structure, materials, and processes that may affect product performance: C. During normal production, in order to test the stability of product quality, for products with G, ≤16t, if the quarterly output is less than 20 units, one unit will be sampled each year, and if the quarterly output exceeds 20 units, one unit will be sampled every six months. For products with G>16t, at least one unit will be sampled each year regardless of the output; d. When the product has been discontinued for more than two years and production is resumed; e. When the factory inspection results are significantly different from the last type inspection; f. When the national quality supervision agency proposes a type inspection requirement. 6.2.2 The content of the type inspection includes all the contents specified in this standard (for the warranty period specified in Chapter 8, user feedback in the product after-sales service is allowed to be used for assessment).
6.2.3 If the manufacturer does not have the conditions to conduct tests, a type inspection should be conducted at the user's site. 6.2.4 The cranes to be type-tested shall be designated by the quality inspection department of the manufacturer or the national quality supervision agency according to the actual situation and possibility, and shall be allocated according to the type, lifting weight, span size and working level, so that they can gradually reach comprehensive assessment. 7 Marking, packaging, transportation and storage
7.1 Crane marking
7.1.1 A crane sign shall be installed in a conspicuous position in the crane driver's cab. The sign shall comply with the provisions of GB/T13306. The content on the sign shall include:
Product name;
Main performance parameters of the crane;
Crane code or mark;
Manufacturing date or production number;
Manufacturer name.
7.1.2 An obvious lifting weight tonnage sign shall be set outside the middle of the crane main beam span, and the tonnage sign shall indicate: a.
Rated lifting weight;
Manufacturer name.
Packaging, transportation and storage
The packaging, transportation and storage of cranes shall comply with the relevant provisions of GB191 and GB/T13384. 7. 2. 2
When the crane leaves the factory, the following documents shall be provided: Product certificate:
Product operation and maintenance instructions (including the instructions provided by the purchased parts); Packing list;
Installation drawing:
Damage parts drawing.
8 Warranty period
The manufacturer shall guarantee that the supplied cranes will work normally within 12 months from the date of use, but not more than 18 months from the date of shipment, provided that the user properly keeps, reasonably installs and uses them correctly. 351
A1 Bridge test conditions
JB/T3695--94
Appendix A
Test conditions for crane bridge and span
(Supplement)
A1.1 During the test, the support point of the bridge should be below the end beam and close to the wheel. A1.2 The bridge is leveled with the four reference points (vertices of the wheel support center) on the flange plate of the end beam, and the error does not exceed 3mm in the span direction and 2mm in the base distance direction.
A1.3 The bridge should be measured without the influence of sunlight. A1.4 When measuring the camber of the main beam by the wire pulling method, the diameter of the wire is 0.49~0.52mm. The pulling force is 150N. The correction value listed in Table A1 due to the influence of the deadweight of the wire is deducted from the measured data, which is the actual camber of the main beam. Table A1
Span/m
Correction value/mm
Span test conditions
A2.1 The tension value and correction value specified in Table A2 shall be used for measurement. 16.5
A2.2 The temperature of the steel tape and the crane shall be consistent during measurement. The steel tape shall not swing and shall droop naturally. 22.5
A2.3 The reading on the steel tape obtained by measurement plus the correction value listed in Table A2, plus the measurement correction number of the steel tape (positive or negative; must be qualified by the provincial-level metrology department and within the validity period), is the actual span of the crane. Table A2bZxz.net
Tension value
Steel tape section, mm
Correction value, mm
Note: The correction value in Table A2 has deducted the elastic elongation caused by the 50N force required for calibration according to JJG4 "Steel Tape Calibration Regulations". Additional Notes:
This standard was proposed and managed by the Beijing Hoisting and Transportation Machinery Research Institute of the Ministry of Machinery Industry. This standard was drafted by Wuhan Crane Factory. The main drafters of this standard are Bei Enhai, Shen Yichun, Zhang Lamei and Chen Xiaomei. 3523 The reading on the measured steel tape plus the correction value listed in Table A2, plus the measurement correction number of the steel tape (positive or negative; must be verified by the provincial-level measurement department and within the validity period), is the actual span of the crane. Table A2
Tension value
Steel tape section, mm
Correction value, mm
Note: The correction value in Table A2 has deducted the elastic elongation caused by the 50N force required during the calibration according to JJG4 "Steel Tape Calibration Regulations". Additional notes:
This standard was proposed and coordinated by the Beijing Hoisting and Conveying Machinery Research Institute of the Ministry of Machinery Industry. This standard was drafted by Wuhan Crane Factory. The main drafters of this standard are Bainhai, Shen Yichun, Zhang Lamei, and Chen Xiaomei. 352
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