Some standard content:
JB/T 9739.2—2000
This standard is a revision of JB/T9739.2-1999 "Pulleys for Truck Cranes and Tire Cranes". Compared with JB/T9739.2-1999, the main technical contents of this standard have been modified as follows: the winding diameter calculation coefficient is equivalent to the relevant provisions of IS08087:1985 "Dimensions of mobile crane drums and pulleys"; the basic dimensions of the rope groove section refer to DIN15061.1-1977 "Rope groove section of lifting device wire rope pulley", but the wire rope diameter size segmentation is adjusted according to the actual situation in my country, and the shape and position tolerance is in accordance with DIN15063-1977 "Technical conditions for supply of lifting equipment wire rope pulleys". The requirements for the profile of the rope groove
section line and the cylindricity of the hub hole are added; - According to the actual situation of the pulley in this industry, the content of double-width plate pressed pulley is added, the technical requirements of MC nylon pulley are partially modified, and the relevant contents are supplemented and adjusted; \ - Two chapters "Test methods and inspection rules" and "Marking, packaging, transportation and storage" are added. This standard replaces JB/T9739.2-1999 from the date of implementation. Appendices A, B, C, D and E of this standard are all informative appendices. This standard is proposed and managed by Changsha Construction Machinery Research Institute of the Ministry of Construction. The drafting unit of this standard: Xuzhou Heavy Machinery Plant. The main drafters of this standard: Xu Zhou and Chen Hongjian. This standard was first issued in April 1988 as ZBJ80010.2--88, and the standard number was adjusted to JB/T9739.2-1999 in April 1999.
This standard is entrusted to Changsha Construction Machinery Research Institute of the Ministry of Construction for interpretation. 995
1 Scope
Machinery Industry Standard of the People's Republic of China
Truck crane and wheel crane-Sheave
Truck crane and wheel crane-SheaveJB/T9739.2—2000
Replaces JB/T9739.2--1999
This standard specifies the structural type, main dimensions, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of common pulleys for truck cranes and wheel cranes. This standard is applicable to pulleys of various mechanisms of truck cranes and wheel cranes, and can also be used as a reference for other mobile cranes and variant products.
2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T699—1999 High-quality carbon structural steel www.bzxz.net
GB/T710—1991 Hot-rolled thin steel plates and strips of high-quality carbon structural steel GB/T7111998 Hot-rolled thick steel plates and wide steel strips of high-quality carbon structural steel GB/T1800.3-1998 Limits and fit basis Part 3: Standard tolerances and basic deviations numerical table GB/T32741988 Hot-rolled thick steel plates and strips of carbon structural steel and low-alloy structural steel GB/T6068. 2-1985 Truck crane and tire crane test specification Qualification test GB/T8162-1987 Seamless steel pipe for structure GB/T13237-1991 Cold-rolled thin steel plate and strip of high-quality carbon structural steel JB/T5936-1991 General technical conditions for machining of engineering machinery JB/T5937-1991 General technical conditions for grey cast iron parts of engineering machinery 1 Engineering machinery
General technical conditions for welded parts
JB/T 59431991
JB/T 5947—1991
Construction machinery
3 Product classification
3.1 Type
General technical conditions for packaging
Common pulleys for truck cranes and tire cranes are divided into four types according to their structural types: a) Cast pulley, code ZH;
b) MC nylon pulley, code NH;
c) Welded pulley, code HH;
d) Double-spoke pressed pulley, code YH.
3.2 Basic parameters and dimensions
3.2.1 The cross-sectional type and basic dimensions of the rope groove shall comply with the provisions of Figure 1 and Table 1. Approved by the State Bureau of Machinery Industry on April 24, 2000, 996
Implemented on October 1, 2000
Wire rope diameter
>9～10
>10～11
>11～12
>12～13
≥13~～14
≥14～15
≥15～16
>16～17
>17~18
a) Cast pulley
c) Welded pulley
Groove bottom radius←
JB/T 9739.2--2000
Figure 1 Section of pulley rope groove
Table 1 Basic dimensions of pulley rope groove section
Limit deviation 13
b) MC nylon pulley
d) Double-spoke pressed pulley
Rim width
MC nylon
Cast pulley
Welded pulley
Double-spoke pressed pulley
Steel rope diameter
>18～19
>19～20
>20～21
>21～22
>22～23
>23~24
>24～25||t t||>25～26
>26～27
>27～28
>28-29
>29～30
>30～31
>31～32
>33~34
>35～36
>36~37||tt| |>38～~39
>39～40
Trough bottom radius r
Limit deviation\)
JB/T 9739.2-2000
Table 1 (end)
Cast pulley
Rim width
MC nylon
1) Column H13 is for cast pulleys, column H16 is for MC nylon pulleys, welded pulleys and double-spoke pressed pulleys. 3.2.2 Structural dimensions
For the structural dimensions of cast pulleys, see Appendix A (suggestive appendix). For the structural dimensions of MC nylon pulleys, see Appendix B (suggestive appendix). For the structural dimensions of welded pulleys, see Appendix C (suggestive appendix). For the structural dimensions of double-spoke pressed pulleys, see Appendix D (suggestive appendix). 3.3 Marking
3.3.1 Model naming
Welded pulley
Double-spoke pressed pulley
3.3.2 Marking example
JB/T 9739.2—2000
Supplementary code (determined by the manufacturer)
-Pulley bottom diameter D, mm
Wire rope diameter d, mm
Pulley type, according to the provisions of 3.1
Cast pulley with bottom diameter D=210mmtm and wire rope diameter d=14.5mm is marked as: Pulley ZH14.5X210JB/T9739.2
4 Technical requirements
4.1 Winding diameter of pulley
The minimum winding diameter of the pulley is calculated according to formula (1): Domin =hid
Wherein: D.
-diameter of pulley winding calculated at the center of wire rope, mm; -diameter of wire rope, mm;
-coefficient related to working mechanism, selected according to Table 2, coefficient hl of Table 2
Lifting mechanism
Luffing mechanism
Telescopic mechanism
4.2 Bottom diameter of pulley
Moving pulley
Fixed pulley
Moving pulley
Fixed pulley
Extending pulley
Retracting pulley
The bottom diameter D of pulley is calculated according to formula (2), and its value should be rounded to meet the requirements of Table 3: D≥Domin-d
For the matching of bottom diameter of pulley with wire rope diameter and shaft diameter, see Appendix E (suggestive Appendix). Table 3 Pulley bottom diameter D
(1)
4.3 Conditions of use
JB/T 9739.2—2000
4.3.1 The operating temperature is -40~~~+50°C, but the operating temperature of MC nylon pulley should be greater than or equal to -20°C. 4.3.2 When the wire rope is wound in and out of the pulley groove, the allowable deflection angle (i.e. the angle between the center line of the wire rope and the plane perpendicular to the pulley axis) is ≤5°. 4.4 General requirements
4.4.1 The pulley shall be manufactured according to the drawings and technical documents approved by the prescribed procedures. 4.4.2 The cast pulley shall comply with the provisions of JB/T5937 and shall be annealed to eliminate internal stress. 4.4.3 MC nylon pulleys shall contain molybdenum disulfide or graphite. After centrifugal casting, there shall be no defects such as bubbles, cracks, looseness, impurities, etc., and the surface shall be clean and smooth. The rough parts shall be soaked in a boiling water-based solution. The soaking time shall be calculated according to formula (3), and it is recommended to be not less than 15h. Tmin = kt
Where: T——soaking time, h;
—calculated thickness, the distance from the last penetration point of the pulley to the surface, mm; t
soaking time for each millimeter of calculated thickness, k=0.5h/mm. (3)
4.4.4 Welded pulleys shall comply with the provisions of JB/T5943. The surface of the wheel groove shall be free of scratches after rolling, and the oxide scale shall be removed. The butt weld shall be ground flat and annealed to eliminate internal stress. 4.4.5 The pressed part of the double-spoke plate pressed pulley shall be smooth and flat, without wrinkles, cracks and burrs. The requirements for the surface of the wheel groove are the same as those for MC nylon pulleys. 4.4.6 The pulley shall comply with the provisions of JB/T5936 after machining. 4.4.7 The machined parts of cast pulleys, welded pulleys and double-spoke plate pressed pulleys shall be rust-proofed to ensure that they are not rusted at the time of delivery. The unprocessed parts shall be painted. Puttying is strictly prohibited before painting. The paint shall be firm, uniform in color, and free of marks, sagging, shrinkage, shedding, and roughness. 4.4.8 The pulley shall rotate normally and the rope groove shall not have obvious wear marks after the factory test (see 5.3.2) when installed on the truck crane or tire crane. No abnormal situation shall occur during the test. 4.4.9 Scrap of pulley
Pulleys shall be scrapped if any of the following conditions occur: a) cracks or loose riveted tubes;
b) broken rim;
c) wear of welded pulley exceeds 20% of the rim plate thickness; d) wear of double-spoke plate pressed pulley rope lining exceeds 50% of the original thickness; e) wear of other pulley rope groove exceeds 25% of the wire rope diameter; f) other defects that damage the wire rope.
4.5 Limits and fits
4.5.1 The inner hole tolerance zone of the rolling bearing installed on the cast pulley, welded pulley and double-spoke pressed pulley is M7. 4.5.2 The limit deviation of the inner hole tolerance zone when the rolling bearing is installed on the MC nylon pulley shall comply with the following provisions. The upper deviation ES is calculated according to formula (4):
ES= --(C;+0. 0012D)
Where: ES
Upper deviation, mm;
C,—basic interference (value selected according to Figure 2), mm, D—basic size of the bearing hole, mm.
Lower deviation EI is calculated according to formula (5):
EIES-IT10
Where: EI —
-lower deviation, mm;
Standard tolerance value (selected according to GB/T1800.3), mm. (4)
(5))
4.6 Surface roughness
4.6.1 Surface of pulley rope groove:
—For cast pulley: ;
JB/T 9739.2-2000
Figure 2 Basic interference curve of MC nylon pulley bearing hole·-MC nylon pulley and double-spoke pressed pulley: ?;-Welded pulley: 9.
4.6.2 Pulley hub
~Bearing hole: ;
—Both end faces: 25.
4.7 Geometric tolerances
4.7.1 The radial runout of the bottom diameter of the rope groove to the bearing hole: cast pulleys are not greater than 1mm;
MC nylon pulleys are not greater than 1.5mm;
welded pulleys are 1.5mm when D is not greater than 300mm, and calculated as D/200 when it is greater than 300mm; the pressed groove of the spoke plate of a double spoke plate pressed pulley is the same as that of a welded pulley, and the side clearance between the rope lining and the pressed groove is not greater than 0.5mm. 4.7.2 The line profile tolerance of the rope groove section should not be greater than the limit deviation of the rope groove radius. 4.7.3 The cylindrical tolerance of the hub bearing mounting hole shall not be greater than 1/2 of its dimensional tolerance.5 Test methods and inspection rules
5.1 Type inspection
5.1.1 Type inspection shall be carried out in any of the following cases: a) when new products or old products are put into production for trial production and identification; b) when the structure, material and process are changed after mass production, which may affect the product performance; c) at least once every three years under normal production conditions; d) when required by the national quality and technical supervision department. 1001
JB/T 9739.2-2000
5.1.2 Before type inspection, the inspection outline shall be determined according to this standard and relevant technical documents, and a type inspection report shall be issued after the test.5.2 Factory inspection
5.2.1 The pulley shall be inspected and qualified by the inspection department of the manufacturer, and the product certificate shall be issued before it can be shipped. 5.2.2 The factory inspection is a full inspection, and the inspection content includes the size, surface roughness, geometric tolerance and appearance quality of the pulley. The inspection method is formulated by the manufacturer according to this standard. 5.3 Delivery inspection
5.3.1 The receiving unit has the right to inspect and accept according to this standard and the contract. 5.3.2 The pulley should be able to pass the installation test, and its test conditions should at least include the factory test items specified in Chapters 4 to 7 of GB/T6068.2--1985.
6 Marking, packaging, transportation and storage
6.1 Marking
The model and manufacturer's trademark should be marked in a conspicuous place on the pulley. This mark should be clear, not easy to wear, and will not affect the performance. 6.2 Packaging
The pulley must be packaged when leaving the factory, and its packaging should comply with the provisions of JB/T5947 to ensure that it is not damaged or corroded. 6.3 Transportation
During transportation, the pulley is strictly prohibited from collision, bumping, sun exposure and rain exposure, and the pulley should be kept free from damage. 6.4 The pulley should be stored in a dry and ventilated warehouse, and should not come into contact with acid, alkali and other corrosive substances, and should be protected from water invasion and long-term exposure to the sun.
JB/T9739.2--2000
Appendix A
(Suggestive Appendix)
Structure type and size of cast pulley
A1 The structure type of cast pulley is shown in Figure A1, and the size is shown in Table A1. Cx45°
Casting pulley structure type
Wire rope diameter
>9～10
>10～11
>11～12
>12～13
>13～14
>14～15
>15～16
>16～17
>17~~18
>18~19
>19~20
>20~21
>21~~22
>22~23
>23~24
>24 ~25
>25～26
Casting pulley size
Wire rope diameter
>26～27
>27~～28
>28～29
>29～~30
>30～31
>31～32
>32～33
>33~34
>34 ~~35
≥35～36
>36~37
>37～38
≥38~39
>39~～40
A2 pulley reinforcement ribs and spoke plate holes
JB/T 9739.2—2000
Table A1 (end)
A2.1 When the length of the pulley web (in the radial direction) is greater than 60 mm, a reinforcing rib should be provided. The web L is calculated according to formula (A1):
L=(D—D)/2—(t+r2)
-diameter of the pulley bottom, mm;
where: D——
D,-diameter of the bearing hole, mm;
t——thickness of the bearing seat, mm;
r—radius of the arc of the groove bottom wall thickness, mm.
A2.2 When the length of the pulley spoke (radial direction) is greater than 100mm, spoke holes should be provided. ti
A3 The material of the cast pulley is HT200, and its mechanical properties should comply with the provisions of JB/T5937. Other materials that meet relevant standards can also be selected according to the contract.
Appendix B
(Suggested Appendix)
MC nylon pulley structure type and size
B1MC nylon pulley structure type see Figure B1, size see Table B1.1004
Wire rope diameter
>9～10
>10～
>11～12
≥12～13
≥13～14
≥>14 ~15
>15～16
≥16～17
>17～18
>18～19
≥19～20
>20～21
>21～22
>22~23
>23~24
>24~2 5
>25～26
>26~ 27
JB/T 9739.2--2000
Transition fillet
MC nylon pulley structure type
MC nylon pulley size
Wire rope diameter
>27～28
>28～29
>29～30
>30～31
>31～32
>32～33|| tt||>33~34
>34~～35
≥35～36
>36～37
>37~～38
>38～39
>39~～~40
Comprehensive technical performance
JB/T9739.2—2000
Table B1 (end)
M The comprehensive technical performance of C nylon pulley shall comply with the provisions of Table B2 t
Table B2MC Comprehensive technical performance items of nylon pulley
Physical properties
Mechanical properties
Mechanical properties
Thermal properties
Water absorption
Hardness (Brinell)
Dry friction coefficient (against steel)
Tensile strength
Bending strength
Compressive strength
Elongation at break
Tensile elastic modulus
Bending elastic modulus
Impact strength (unnotched)
Linear expansion coefficient
Heat deformation temperature (1.81MPa)
Martin heat resistance
Maximum temperature for continuous use
Brittle temperature
10-$/ C
Indicator value
1.15~1.16
0.31~0.35
125~170
149167
105~127
510~628
223~225
150~100
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