Some standard content:
Mechanical Industry Standard of the People's Republic of China
JB/T 1115-94
Manual Overhead Crane
1994-07-18 Issued
Ministry of Machinery Industry of the People's Republic of China
1995-07-01 Implementation
Mechanical Industry Standard of the People's Republic of China
Manual Overhead Crane
1 Subject Content and Scope of Application
JB/T 1115-94
Replaces JB1115-68
This standard specifies the types and basic parameters, technical requirements, test methods, inspection rules, etc. of manual overhead cranes (hereinafter referred to as cranes).
This standard applies to cranes with a working level not exceeding A1 and driven by hand chains on the ground. 2 Reference standards
GB1102
GB 1348
GB1591
GB3323
GB5905
GB5972
GB6164
GB7592
GB 8918
GB8923
GB 9286
GB9439
GB 10051
GB 10095
GB10183
GB11345
GB/T 12469
GB/T 13306
GB/T 13384
JB2299
JB/T7334
ZB J80 006
ZBJ80007
Pictorial symbols for packaging, storage and transportation
Technical conditions for high-quality carbon structural steel
Carbon structural steel
Maximum lifting capacity series for lifting machinery
Round strand steel wire rope
Ductile iron castings
Low alloy structural steel
Radiography and quality classification of steel fusion welded butt jointsCrane test specifications and procedures
Practical specifications for inspection and scrapping of steel wire ropes for lifting machineryCrane buffers
Limited dimensions of general-purpose bridge cranes
High-quality steel wire rope
Rust grade and rust removal grade of steel surface before painting Cross-cut test of paint and varnish film
Grey cast iron
Lifting hook
Involute circle Column gear accuracy
Tolerances for manufacturing and rail installation of bridge and gantry cranesManual ultrasonic testing methods and classification of testing results for steel weldsCast carbon steel for general engineering
Welding quality assuranceRequirements and defect classification for steel fusion welded joints
General technical conditions for packaging of electromechanical products
Painting colors and safety signs for mining, engineering, lifting and transportation machinery productsHand chain hoists
Cast pulleys for cranes
Cast drums for cranes
Approved by the Ministry of Machinery Industry on July 18, 1994
Implementation on July 1, 1995
3 Types and basic parameters
3.1 Type
3.1.1 The type of crane is shown in Figure 1: Wc
JB/T 1115-94
S-span iW-trolley base distance: Wc-trolley base distance K-trolley track gauge Note: The lifting mechanism is in the form of a single drum, and a double drum can also be used for 20-32t. 3.1.2 Model indication method
Lifting height, m
Span, m
Rated lifting capacity (hereinafter referred to as lifting capacity), tProduct code
3.1.3 Marking example
Lifting capacity 16+span 16.5m, a crane with a lifting height of 12.5m should be marked as: Crane SQ16-16.5-12.5JB/T1115—943.2 Basic parameters
3.2.1 The lifting capacity of the crane (code: G, unit: t) shall comply with the following regulations: 5, 10, 16, 20.32.
3.2.2 The span of the crane (code: S, unit: m) shall comply with the following regulations: 7.5, 10.5, 13.5, 16.5.
3.2.3 The lifting height of the crane (code: H, unit: m) shall comply with the following provisions: 6, 8, 10, 12.5, 16.
3.3 Limit dimensions
The maximum structural dimensions of the crane shall comply with the limit dimensions requirements in GB7592. 4 Technical requirements
4.1 Working conditions
4.1.1 The installation of the crane running track shall comply with the requirements of GB10183. 4.1.2 The working environment temperature of the crane shall not be lower than -25℃. 4.2 Performance
4.2.1 The lifting capacity of the crane shall reach the rated lifting capacity. 4.2.2 When the lifting mechanism adopts a double drum, each drum mechanism shall be able to be driven separately and shall be equipped with a leveling device for the driving wheel group. 2
JB/T 1115-94
4.2.3 The mechanical efficiency of the transmission system of each mechanism of the crane shall comply with the provisions of Table 1. Table 1
Mechanism name
Open gear transmission level
Transmission mechanical efficiency7
Trolley operation
The sliding distance of the hoisted objects during the descending brake shall comply with the provisions of Table 2, Table 2
Test load
Sliding distance
The vertical static caused by the rated lifting weight and the deadweight of the trolley in the main beam span shall not be greater than S/400.4.2.5
The hand pulling force of each mechanism shall comply with the provisions of Table 3. 4.2.6
Hand pulling force
4.3 Materials and heat treatment
Trolley operation
4.3.1 The materials of the main components of the metal structure shall comply with the provisions of GB700 and GB1591. The selection of grades shall not be lower than the requirements of Table 4 according to the conditions of use.
Component category
Working environment temperature
Steel grade
Important components 1}
Not less than -20℃
Q235-AF
Note: 1) Important components: refers to the main beam, end beam and trolley frame. Lower than -20～-25℃
Q235-B,16Mn2
2) The impact energy is required to be not less than 27J at -20℃, which shall be proposed or supplemented when ordering. Other components
Not less than -25℃
The material of the ratchet and pawl for the brake shall not be lower than 45# steel in GB699. The heat treatment hardness of the ratchet surface shall be 40～454. 3.2
HRC.
The material of the brake disc shall not be lower than QT500-7 ductile iron in GB1348. 4.3.3
The material of the wheel: for wheels with a lifting capacity of less than or equal to 16t, it shall not be lower than HT200 gray iron in GB9439; for wheels with a lifting capacity of more than 16t, it shall not be lower than QT500-7 ductile iron in GB1348, and its tread hardness shall be 170～240HB. 4.3.5The material of the large gear shall not be lower than QT500-7 ductile iron in GB1348 or ZG340-640 cast steel in GB11352.
4.3.6The material of the wheel shaft, gear shaft and driving gear shall not be lower than No. 45 steel in GB699. 4.4 Main Components
4.4.1 Cranes should use components with performance not lower than the following standards: Wire rope
Buffer
GB1102 or GB8918
GB6164
GB 10051
Cast pulley ZBJ80006
Cast drum ZBJ80007
JB/T1115-94
4.4.2 The accuracy of the open transmission gear pair shall meet the following requirements: The transmission gear of the hoisting mechanism shall not be lower than the 10-9-9 level specified in GB10095. The transmission gear of the running mechanism shall not be lower than the 10 level specified in GB10095. 4.4.3 After the wheel is installed, the circular runout on the reference end face shall meet the requirements of Table 5. Table 5
Wheel diameter mm
End face runout μm
4.4.4 Wheel tread diameter tolerance shall not be less than h9.200315
4.4.5 Hand chain shall comply with the relevant provisions of JB/T7334. 4.5 Welding
4.5.1 The welding rod, welding wire and welding flux used for welding components shall be compatible with the materials to be welded. 4.5.2 The welding quality of the outside of the weld shall not be lower than the grade requirements in GB/T12469 defect classification. >315~630
4.5.3 The butt welds of the flange plate and web plate in the tension zone of the main beam shall be subjected to radiographic inspection. The radiographic inspection shall not be lower than the level I specified in GB3323, and the ultrasonic inspection shall not be lower than the level II specified in GB11345. 4.6 Bridge
4.6.1 The main beam shall have an upper camber, and the upper camber at the mid-span shall be (0.9/1000~~1.4/1000)S. And the maximum upper camber shall be controlled within the range of S/10 symmetrical to the mid-span. For the bridge inspection conditions, see Appendix A (Supplement). 4.6.2 The bending of the main beam in the horizontal direction shall not be greater than S/2000. 4.6.3 The local flatness of the web plate of the main beam shall be tested with a 1m flat ruler, and shall not be greater than 0.76 in the area within H/3 from the upper flange plate. The rest of the area shall not be greater than 1.2 (see Figure 2).
4.6.4 The horizontal deflection value of the upper flange plate of the box beam and the single web beam is 6≤B/200 (see Figure 3). Upper flange plate
4.6.5 The vertical deflection value of the web plate of the box beam is ≤H/200. The vertical deflection value of the single web beam is h≤H/300 (see Figure 4). 4.6.6 The trolley track is generally suitable for a whole track with the joints welded together. The following requirements must be met: a. The height difference at the joint is d≤lmm (see Figure 5); b. Head clearance at the joint e≤2mm (see Figure 5); c.
Lateral misalignment at the joint f≤1mm (see Figure 6) d.
For straight track box beams and semi-deviant track box beams, the track joints should be placed within 15mm of the stiffener plate: 4
JB/T 1115-94
e The shortest track length at both ends should not be less than 1.5m. 4.6.7 For deviant track box beams and single web beams, the position offset of the trolley track centerline to the web centerline of the rail beam (see Figure 7): when a≥12mm, g≤/2, when 912mm, g≤6mm. Figure 4
4.6.8 The limit deviation of the trolley track gauge K should not exceed ±5mm at the mid-span; it should not exceed ±3mm at the span end. 4.6.9 The height difference between the two trolley tracks on the same section perpendicular to the trolley running direction should comply with the provisions of Table 6. Table 6
Track gauge K
Height difference
≤0.0015K
The local flatness tolerance △ formed by the top of two trolley tracks shall not exceed the smaller value of the following values (see Figure 8). 4. 6. 10
Ah,≤0. 001 We
or Ah,≤0.001 K
Wc-trolley base distance: K-trolley track gauge.
4.6.11 The distortion of the unloaded trolley frame must be limited so that the vertical deviation Ah+ of one wheel to the plane formed by the other three wheels shall not exceed 2Ah/3 (see Figure 8). 4.6.12 The lateral straightness of the trolley track shall meet the following requirements: a. The deviation within each 2m length shall not exceed 1mm. b. The deviation 6 within the full length of the track is calculated as follows: When S≤10.5m, b≤6mm;
JB/T1115-94
When s>10.5m, b≤6+0.2(s-10), bmax=10mm (see Figure 9). Figure 8
4.7 Assembly
4.7.1 Diagonal difference of trolley:
1S3-S4l≤3mm (see Figure 10)
4.7.2 Diagonal difference of bridge, measured from the reference point of wheel installation: IS,-S,l≤5mm (see Figure 11).
4.7.3 The limit deviation AS of the crane span S shall comply with the following provisions [For span test conditions, see Appendix A (Supplement)]: When S≤10.5m, AS=±5mm;
When S>10.5m, AS=±[5+0.25(S-10)Jmm. 4.7.4 The limit deviation △K of the trolley gauge K measured by the trolley wheel shall not exceed ±3mm. 4.7.5 When the wheels are suspended (see Appendix A), the axis deviation α of the crane and trolley wheels on the vertical plane shall not be greater than 1/200, and the upper edge of the wheel end face shall be biased to the outside (see Figure 12). 6
JB/T 111594
4.7.6 The horizontal deflection e of the crane and trolley wheels shall not be greater than 6/300, and the deflection directions of the two wheels on the same axis shall be opposite (see Figure 13).
4.7.7 The isochronous difference of wheels on the same end beam should not exceed 2mm. 4.4.8 The height difference of the crane wheel support point should be less than 0.0015W. When the flange plate on the end beam is used as the detection reference, the flatness of the reference surface should not exceed 1mm. (See Appendix A for leveling conditions) The height difference can be selected according to Table 7 after rounding and simplification. Table 7
Trolley base distance m
Height difference
Trolley base distance m
Height difference
≥2. 3~-2. 7
>4, 3~4. 7
JB/T 1115-94
4.7.9 After the assembly of each mechanism, turn its sprocket by hand to make the last shaft rotate one circle. It should rotate flexibly and there should be no abnormal phenomena such as jamming, looseness or tightness.
4.7.10 The meshing contact area between the ratchet and the pawl shall not be less than 80%. 4.8 Safety
4.8.1 The brake shall be sensitive and reliable, and the braking safety factor shall be greater than or equal to 1.3. 4.8.2 The lifting mechanism shall be provided with a lifting height limit mark. 4.8.3 The selection of steel wire rope for cranes shall comply with the provisions of Article 4.4.2 of GB3811. And it shall be inspected and scrapped in accordance with the requirements of GB5972.
4.8.4 The crane operating mechanism shall be provided with a track sweeping plate and a buffer. 4.8.5 The trolley operating mechanism shall be equipped with a buffer and a stop device. 4.8.6 The trolley shall be provided with a platform and a handrail. The minimum height of the handrail is 700mm. 4.8.7 The exposed open gears on the crane shall be provided with a protective cover. 4.9 Appearance
4.9.1 The main components shall be subjected to surface rust removal treatment before painting, and the rust removal shall meet the requirements of Sa2 or St3 specified in GB8923; the key components shall meet Sa2 or St2. 4.9.2 The crane topcoat shall be even, fine, bright, complete and consistent in color, and shall not have defects such as roughness, paint leakage, rust, wrinkles, pinholes and severe sagging.
4.9.3 The total thickness of the dry film of the paint film is 75105μm, of which the thickness of each layer is 25~~35μm. 4.9.4 The adhesion of the paint film shall meet the first-level quality requirements specified in GB9286. 4.9.5 The color of the paint shall generally meet the requirements of JB2299. 5 Test method
The test of the crane shall comply with the specifications and procedures specified in GB5905. 5.1 Visual inspection
The visual inspection shall include whether the specifications and status of all important parts meet the requirements, such as: the metal structure of the crane and its connecting parts;
all protective devices:
hook and movable pulley block and its connecting parts:
wire rope and its fixings;
sprocket, hand chain and shaft end fixings, etc. e.
The visual inspection shall also include checking whether the necessary certificates have been submitted and reviewed. 5.2 Qualification test
5.2.1 After 2-~3 times of gradual loading to the rated lifting weight, start the test to verify whether the items listed in Table 8 meet the requirements of this standard and design drawings.
5.2.2 Determination method of hand pulling force of each mechanism
The hand pulling force can be determined by sensor method or code measurement method. When measuring with sensor, the sensor must be calibrated. When measuring with a basic weight, a weight should be hung on one side of the hand chain under rated load, and the weight should be gradually increased in small amounts until the static friction is overcome and the lifting mechanism (or trolley or car) is slowly driven to move. The weight of the weight hung at this time is the hand pull force of the moving mechanism to be measured. The hand pull force is measured three times and the average value is taken.The height difference at the joint is d≤1mm (see Figure 5); b. The head clearance at the joint is e≤2mm (see Figure 5); c.
The lateral displacement at the joint is f≤1mm (see Figure 6) d.
For straight track box beams and semi-deviant track box beams, the track joint should be placed within 15mm from the rib plate: 4
JB/T 1115-94
eThe shortest track length at both ends should not be less than 1.5m. 4.6.7 For skewed track box beams and single web beams, the position offset of the trolley track centerline to the web centerline of the rail beam (see Figure 7): When a≥12mm, g≤/2, when 912mm, g≤6mm. Figure 4
4.6.8 The limit deviation of the trolley track gauge K should not exceed ±5mm at the mid-span; it should not exceed ±3mm at the span end. 4.6.9 The height difference between the two trolley tracks on the same section perpendicular to the running direction of the trolley shall comply with the provisions of Table 6. Table 6
Track gauge K
Height difference
≤0.0015K
The local flatness tolerance △ formed at the top of the two trolley tracks shall not exceed the smaller value of the following values (see Figure 8). 4. 6. 10
Ah,≤0. 001 We
or Ah,≤0.001 K
Wc-trolley base distance: K-trolley track gauge.
4.6.11 The distortion of the unloaded trolley frame must be limited so that the vertical deviation Ah+ of one wheel to the plane formed by the other three wheels shall not exceed 2Ah/3 (see Figure 8). 4.6.12 The lateral straightness of the trolley track shall meet the following requirements: a. The deviation within each 2m length is not greater than 1mm. b. The deviation 6 within the full length of the track is calculated as follows: When S≤10.5m, b≤6mm;
JB/T1115-94
When s>10.5m, b≤6+0.2(s-10), bmax=10mm (see Figure 9). Figure 8
4.7 Assembly
4.7.1 Diagonal difference of trolley:
1S3-S4l≤3mm (see Figure 10)
4.7.2 Diagonal difference of bridge, measured from the reference point of wheel installation: IS,-S,l≤5mm (see Figure 11).
4.7.3 The limit deviation AS of the crane span S shall comply with the following provisions [For span test conditions, see Appendix A (Supplement)]: When S≤10.5m, AS=±5mm;
When S>10.5m, AS=±[5+0.25(S-10)Jmm. 4.7.4 The limit deviation △K of the trolley gauge K measured by the trolley wheel shall not exceed ±3mm. 4.7.5 When the wheels are suspended (see Appendix A), the axis deviation α of the crane and trolley wheels on the vertical plane shall not be greater than 1/200, and the upper edge of the wheel end face shall be biased to the outside (see Figure 12). 6
JB/T 111594
4.7.6 The horizontal deflection e of the crane and trolley wheels shall not be greater than 6/300, and the deflection directions of the two wheels on the same axis shall be opposite (see Figure 13).
4.7.7 The isochronous difference of wheels on the same end beam should not exceed 2mm. 4.4.8 The height difference of the crane wheel support point should be less than 0.0015W. When the flange plate on the end beam is used as the detection reference, the flatness of the reference surface should not exceed 1mm. (See Appendix A for leveling conditions) After rounding and simplifying, the height difference can be selected according to Table 7. Table 7
Trolley base distance m
Height difference
Trolley base distance m
Height difference
≥2. 3~-2. 7
>4, 3~4. 7
JB/T 1115-94
4.7.9 After the assembly of each mechanism, turn its sprocket by hand to make the last shaft rotate one circle. It should rotate flexibly and there should be no abnormal phenomena such as jamming, looseness or tightness.
4.7.10 The meshing contact area between the ratchet and the pawl shall not be less than 80%. 4.8 Safety
4.8.1 The brake shall be sensitive and reliable, and the braking safety factor shall be greater than or equal to 1.3. 4.8.2 The lifting mechanism shall be equipped with a lifting height limit mark. 4.8.3 The selection of steel wire ropes for cranes shall comply with the provisions of Article 4.4.2 of GB3811. And they shall be inspected and scrapped in accordance with the requirements of GB5972.
4.8.4 The crane operating mechanism shall be equipped with a track sweeping plate and a buffer. 4.8.5 The trolley operating mechanism shall be equipped with a buffer and a stop device. 4.8.6 The trolley shall be equipped with a platform and a railing. The minimum height of the railing is 700mm. 4.8.7 The exposed open gears on the crane shall be equipped with a protective cover. 4.9 Appearance
4.9.1 The main components shall be subjected to surface rust removal treatment before painting, and the rust removal shall meet the requirements of Sa2 or St3 specified in GB8923; the key components shall meet Sa2 or St2. 4.9.2 The crane topcoat shall be even, fine, bright, complete and consistent in color, and shall not have defects such as roughness, paint leakage, rust, wrinkles, pinholes and severe sagging.
4.9.3 The total thickness of the dry film of the paint film is 75105μm, of which the thickness of each layer is 25~~35μm. 4.9.4 The adhesion of the paint film shall meet the first-level quality requirements specified in GB9286. 4.9.5 The color of the paint shall generally meet the requirements of JB2299. 5 Test method
The test of the crane shall comply with the specifications and procedures specified in GB5905. 5.1 Visual inspection
The visual inspection shall include whether the specifications and conditions of all important parts meet the requirements, such as: the metal structure of the crane and its connecting parts;
all protective devices:
hook and movable pulley block and its connecting parts:
wire rope and its fixings;
sprocket, hand chain and shaft end fixings, etc. e.
The visual inspection shall also include checking whether the necessary certificates have been submitted and reviewed. 5.2 Qualification test
5.2.1 After 2-~3 times of gradual loading to the rated lifting weight, the test shall be started to verify whether the items listed in Table 8 meet the requirements of this standard and design drawings.
5.2.2 Method for measuring the hand pulling force of each mechanism
The hand pulling force can be measured by sensor method or code measurement method. When measuring with sensor, the sensor must be calibrated. When measuring with a basic weight, a weight should be hung on one side of the hand chain under rated load, and the weight should be gradually increased in small amounts until the static friction is overcome and the lifting mechanism (or trolley or car) is slowly driven to move. The weight of the weight hung at this time is the hand pull force of the moving mechanism to be measured. The hand pull force is measured three times and the average value is taken.The height difference at the joint is d≤1mm (see Figure 5); b. The head clearance at the joint is e≤2mm (see Figure 5); c.
The lateral displacement at the joint is f≤1mm (see Figure 6) d.
For straight track box beams and semi-deflected track box beams, the track joint should be placed within 15mm of the stiffener plate: 4
JB/T 1115-94
eThe shortest track length at both ends should not be less than 1.5m. 4.6.7 For deflected track box beams and single web beams, the position offset of the trolley track centerline to the web centerline of the rail beam (see Figure 7): When a≥12mm, g≤/2, when 912mm, g≤6mm. Figure 4
4.6.8 The limit deviation of the trolley track gauge K should not exceed ±5mm at the mid-span; it should not exceed ±3mm at the span end. 4.6.9 The height difference between the two trolley tracks on the same section perpendicular to the running direction of the trolley shall comply with the provisions of Table 6. Table 6
Track gauge K
Height difference
≤0.0015K
The local flatness tolerance △ formed at the top of the two trolley tracks shall not exceed the smaller value of the following values (see Figure 8). 4. 6. 10
Ah,≤0. 001 We
or Ah,≤0.001 K
Wc-trolley base distance: K-trolley track gauge.
4.6.11 The distortion of the unloaded trolley frame must be limited so that the vertical deviation Ah+ of one wheel to the plane formed by the other three wheels shall not exceed 2Ah/3 (see Figure 8). 4.6.12 The lateral straightness of the trolley track shall meet the following requirements: a. The deviation within each 2m length is not greater than 1mm. b. The deviation 6 within the full length of the track is calculated as follows: When S≤10.5m, b≤6mm;
JB/T1115-94
When s>10.5m, b≤6+0.2(s-10), bmax=10mm (see Figure 9). Figure 8
4.7 Assembly
4.7.1 Diagonal difference of trolley:
1S3-S4l≤3mm (see Figure 10)
4.7.2 Diagonal difference of bridge, measured from the reference point of wheel installation: IS,-S,l≤5mm (see Figure 11).
4.7.3 The limit deviation AS of the crane span S shall comply with the following provisions [For span test conditions, see Appendix A (Supplement)]: When S≤10.5m, AS=±5mm;
When S>10.5m, AS=±[5+0.25(S-10)Jmm. 4.7.4 The limit deviation △K of the trolley gauge K measured by the trolley wheel shall not exceed ±3mm. 4.7.5 When the wheels are suspended (see Appendix A), the axis deviation α of the crane and trolley wheels on the vertical plane shall not be greater than 1/200, and the upper edge of the wheel end face shall be biased to the outside (see Figure 12). 6
JB/T 111594
4.7.6 The horizontal deflection e of the crane and trolley wheels shall not be greater than 6/300, and the deflection directions of the two wheels on the same axis shall be opposite (see Figure 13).
4.7.7 The isochronous difference of wheels on the same end beam should not exceed 2mm. 4.4.8 The height difference of the crane wheel support point should be less than 0.0015W. When the flange plate on the end beam is used as the detection reference, the flatness of the reference surface should not exceed 1mm. (See Appendix A for leveling conditions) The height difference can be selected according to Table 7 after rounding and simplification. Table 7
Trolley base distance m
Height difference
Trolley base distance m
Height difference
≥2. 3~-2. 7
>4, 3~4. 7
JB/T 1115-94
4.7.9 After the assembly of each mechanism, turn its sprocket by hand to make the last shaft rotate one circle. It should rotate flexibly and there should be no abnormal phenomena such as jamming, looseness or tightness.
4.7.10 The meshing contact area between the ratchet and the pawl shall not be less than 80%. 4.8 Safety
4.8.1 The brake shall be sensitive and reliable, and the braking safety factor shall be greater than or equal to 1.3. 4.8.2 The lifting mechanism shall be equipped with a lifting height limit mark. 4.8.3 The selection of steel wire ropes for cranes shall comply with the provisions of Article 4.4.2 of GB3811. And they shall be inspected and scrapped in accordance with the requirements of GB5972.
4.8.4 The crane operating mechanism shall be equipped with a track sweeping plate and a buffer. 4.8.5 The trolley operating mechanism shall be equipped with a buffer and a stop device. 4.8.6 The trolley shall be equipped with a platform and a railing. The minimum height of the railing is 700mm. 4.8.7 The exposed open gears on the crane shall be equipped with a protective cover. 4.9 Appearance
4.9.1 The main components shall be subjected to surface rust removal treatment before painting, and the rust removal shall meet the requirements of Sa2 or St3 specified in GB8923; the key components shall meet Sa2 or St2. 4.9.2 The crane topcoat shall be even, fine, bright, complete and consistent in color, and shall not have defects such as roughness, paint leakage, rust, wrinkles, pinholes and severe sagging.
4.9.3 The total thickness of the dry film of the paint film is 75105μm, of which the thickness of each layer is 25~~35μm. 4.9.4 The adhesion of the paint film shall meet the first-level quality requirements specified in GB9286. 4.9.5 The color of the paint shall generally meet the requirements of JB2299. 5 Test method
The test of the crane shall comply with the specifications and procedures specified in GB5905. 5.1 Visual inspection
The visual inspection shall include whether the specifications and status of all important parts meet the requirements, such as: the metal structure of the crane and its connecting parts;
all protective devices:
hook and movable pulley block and its connecting parts:
wire rope and its fixings;
sprocket, hand chain and shaft end fixings, etc. e.
The visual inspection shall also include checking whether the necessary certificates have been submitted and reviewed. 5.2 Qualification test
5.2.1 After 2-~3 times of gradual loading to the rated lifting weight, start the test to verify whether the items listed in Table 8 meet the requirements of this standard and design drawings.
5.2.2 Determination method of hand pulling force of each mechanism
The hand pulling force can be determined by sensor method or code measurement method. When measuring with sensor, the sensor must be calibrated. When measuring with a basic weight, a weight should be hung on one side of the hand chain under rated load, and the weight should be gradually increased in small amounts until the static friction is overcome and the lifting mechanism (or trolley or car) is slowly driven to move. The weight of the weight hung at this time is the hand pull force of the moving mechanism to be measured. The hand pull force is measured three times and the average value is taken.2 The diagonal difference of the bridge, measured from the reference point where the wheel is installed: IS,-S,l≤5mm (see Figure 11).
4.7.3 The limit deviation AS of the crane span S shall comply with the following provisions [See Appendix A (Supplement) for span test conditions: When S≤10.5m, AS=±5mm;
When S>10.5m, AS=±[5+0.25(S-10)Jmm. 4.7.4 The limit deviation △K of the trolley gauge K measured by the trolley wheel shall not exceed 3mm. 4.7.5 When the wheels are overhead (see Appendix A), the axis deviation α of the crane and trolley wheels on the vertical plane shall not be greater than 1/200, and the upper edge of the wheel end face shall be biased to the outside (see Figure 12). 6
JB/T 111594
4.7.6 The horizontal deflection value e of the crane and trolley wheels shall not exceed 6/300, and the deflection directions of the two wheels on the same axis shall be opposite (see Figure 13).
4.7.7 The position difference of the wheels on the same end beam shall not exceed 2mm. 4.4.8 The height difference of the crane wheel support point shall be less than 0.0015W. When the flange plate on the end beam is used as the detection reference, the flatness of the reference surface shall not exceed 1mm (see Appendix A for leveling conditions). The rounded and simplified height difference can be selected according to Table 7. Table 7
Trolley base distance m
Height difference
Trolley base distance m
Height difference
≥2. 3~-2. 7
>4, 3~4. 7
JB/T 1115-94
4.7.9After the assembly of each mechanism, turn the sprocket by hand to make the last shaft rotate one circle. It should rotate flexibly and there should be no abnormal phenomenon such as jamming, loosening or tightening.
4.7.10 The meshing contact area between the ratchet and the pawl should be not less than 80%. 4.8 Safety
4.8.1 The brake should be sensitive and reliable, and the braking safety factor should be greater than or equal to 1.3. 4.8.2 The lifting mechanism should be equipped with a lifting height limit mark. 4.8.3 The selection of wire rope for cranes should comply with the provisions of Article 4.4.2 of GB3811. And inspect and scrap according to the requirements of GB5972.
4.8.4 The crane operating mechanism should be equipped with a track sweeper and a buffer. 4.8.5 The trolley operating mechanism should be equipped with a buffer and a stopper. 4.8.6 The trolley should be equipped with a platform and a handrail. The minimum height of the handrail is 700mm. 4.8.7 The exposed open gears on the crane should be equipped with a protective cover. 4.9 Appearance
4.9.1 The main components should be rust-free before painting, and the rust removal should meet the requirements of Sa2 or St3 specified in GB8923; the key components should meet Sa2 or St2. 4.9.2 The crane surface paint should be even, delicate, bright, complete and consistent in color, and should not have defects such as roughness, paint leakage, rust, wrinkles, pinholes and severe sagging.
4.9.3 The total thickness of the dry film of the paint film is 75105μm, of which the thickness of each layer is 25~~35μm. 4.9.4 The adhesion of the paint film shall meet the first-level quality requirements specified in GB9286. 4.9.5 The color of the paint shall generally meet the requirements of JB2299. 5 Test method
The test of the crane shall comply with the specifications and procedures specified in GB5905. 5.1 Visual inspection
The visual inspection shall include whether the specifications and conditions of all important parts meet the requirements, such as: the metal structure of the crane and its connecting parts;
all protective devices:
hook and movable pulley block and its connecting parts:
wire rope and its fixings;
sprocket, hand chain and shaft end fixings, etc. e.
The visual inspection shall also include checking whether the necessary certificates have been submitted and reviewed. 5.2 Test included
5.2.1 After 2-~3 times of gradual loading to the rated lifting weight, start the test to verify whether the items listed in Table 8 meet the requirements of this standard and design drawings.
5.2.2 Determination method of hand-pulling force of each mechanism
Hand-pulling force can be measured by sensor method or yard measurement method. When measuring with sensor, the sensor must be calibrated. When measuring with basic yard, under the rated load, the yard should be hung on one side of the hand-pulling chain, and the yard should be gradually increased in small amounts until the static friction is overcome and the lifting mechanism (or trolley or car) is slowly driven to move. At this time, the weight of the yard hung is the hand-pulling force of the measured moving mechanism. The hand-pulling force is measured three times and the average value is taken.2 The diagonal difference of the bridge, measured from the reference point where the wheel is installed: IS,-S,l≤5mm (see Figure 11).
4.7.3 The limit deviation AS of the crane span S shall comply with the following provisions [For span test conditions, see Appendix A (Supplement)]: When S≤10.5m, AS=±5mm;
When S>10.5m, AS=±[5+0.25(S-10)Jmm. 4.7.4 The limit deviation △K of the trolley gauge K measured by the trolley wheel shall not exceed 3mm. 4.7.5 When the wheels are overhead (see Appendix A), the axis deviation α of the crane and trolley wheels on the vertical plane shall not be greater than 1/200, and the upper edge of the wheel end face shall be biased to the outside (see Figure 12). 6
JB/T 111594
4.7.6 The horizontal deflection value e of the crane and trolley wheels shall not exceed 6/300, and the deflection directions of the two wheels on the same axis shall be opposite (see Figure 13).
4.7.7 The position difference of the wheels on the same end beam shall not exceed 2mm. 4.4.8 The height difference of the crane wheel support point shall be less than 0.0015W. When the flange plate on the end beam is used as the detection reference, the flatness of the reference surface shall not exceed 1mm (see Appendix A for leveling conditions). After rounding and simplifying, the height difference can be selected according to Table 7. Table 7
Trolley base distance m
Height difference
Trolley base distance m
Height difference
≥2. 3~-2. 7
>4, 3~4. 7
JB/T 1115-94
4.7.9After the assembly of each mechanism, turn the sprocket by hand to make the last shaft rotate one circle. It should rotate flexibly and there should be no abnormal phenomenon such as jamming, loosening or tightening in time.
4.7.10The meshing contact area between the ratchet and the pawl should be not less than 80%. 4.8 Safetywww.bzxz.net
4.8.1The brake should be sensitive and reliable, and the braking safety factor should be greater than or equal to 1.3. 4.8.2The lifting mechanism should be equipped with a lifting height limit mark. 4.8.3The selection of wire rope for cranes should comply with the provisions of Article 4.4.2 of GB3811. And inspect and scrap according to the requirements of GB5972.
4.8.4 The crane operating mechanism should be equipped with a track sweeper and a buffer. 4.8.5 The trolley operating mechanism should be equipped with a buffer and a stopper. 4.8.6 The trolley should be equipped with a platform and a handrail. The minimum height of the handrail is 700mm. 4.8.7 The exposed open gears on the crane should be equipped with a protective cover. 4.9 Appearance
4.9.1 The main components should be rust-free before painting, and the rust removal should meet the requirements of Sa2 or St3 specified in GB8923; the key components should meet Sa2 or St2. 4.9.2 The crane surface paint should be even, delicate, bright, complete and consistent in color, and should not have defects such as roughness, paint leakage, rust, wrinkles, pinholes and severe sagging.
4.9.3 The total thickness of the dry film of the paint film is 75105μm, of which the thickness of each layer is 25~~35μm. 4.9.4 The adhesion of the paint film shall meet the first-level quality requirements specified in GB9286. 4.9.5 The color of the paint shall generally meet the requirements of JB2299. 5 Test method
The test of the crane shall comply with the specifications and procedures specified in GB5905. 5.1 Visual inspection
The visual inspection shall include whether the specifications and conditions of all important parts meet the requirements, such as: the metal structure of the crane and its connecting parts;
all protective devices:
hook and movable pulley block and its connecting parts:
wire rope and its fixings;
sprocket, hand chain and shaft end fixings, etc. e.
The visual inspection shall also include checking whether the necessary certificates have been submitted and reviewed. 5.2 Test included
5.2.1 After 2-~3 times of gradual loading to the rated lifting weight, start the test to verify whether the items listed in Table 8 meet the requirements of this standard and design drawings.
5.2.2 Determination method of hand-pulling force of each mechanism
Hand-pulling force can be measured by sensor method or yard measurement method. When measuring with sensor, the sensor must be calibrated. When measuring with basic yard, under the rated load, the yard should be hung on one side of the hand-pulling chain, and the yard should be gradually increased in small amounts until the static friction is overcome and the lifting mechanism (or trolley or car) is slowly driven to move. At this time, the weight of the yard hung is the hand-pulling force of the measured moving mechanism. The hand-pulling force is measured three times and the average value is taken.
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