This standard specifies the type and parameters of double-width plate pressing pulleys, technical requirements, tests and inspections, use requirements, marking, packaging, transportation and storage. This standard is applicable to double-width plate pressing pulleys for wire ropes used in lifting, transportation, construction and hydropower machinery. Pulleys for other machinery can also be used as a reference. JB/T 8398-1996 Double-width plate pressing pulley JB/T8398-1996 Standard download decompression password: www.bzxz.net

Machinery Industry Standard of the People's Republic of China
Double-width plate pressed pulley
1 Subject content and scope of application
JB/T8398-96
This standard specifies the type and parameters, technical requirements, tests and inspections, use requirements, marking, packaging, transportation and storage of double-width plate pressed pulleys.
This standard applies to double-width plate pressed pulleys (hereinafter referred to as pulleys) for lifting, transportation, construction and hydropower machinery. Pulleys for other machinery can also be used for reference.
2 Reference standards
GB/T 1804
General tolerances Unspecified tolerances for linear dimensions
GB/T1031 Surface roughness parameters and their values ​​GB700 Carbon structural steel
GB5675 Grey cast iron classification
GB470 Zinc and zinc alloys
GB/T13384 General technical conditions for packaging of electromechanical products HG2-868 Polyamide 6 resin
3 Types and parameters
3.1 The main dimensions of the rope groove section of the pulley shall comply with the provisions of Figure 1 and Table 1. 3.2 The structural types and parameters of the pulley are shown in Figure 2 and Table 2. Figure 1 Pulley rope groove section
Approved by the Ministry of Machinery Industry of the People's Republic of China on September 3, 1996 262
Implemented on July 1, 1997
Wire rope diameter d
>14~～19
≥>19~24
>24~30
>30~34
>34~～37
>37～43
Wire rope
JB/T8398
Figure 2 Pulley structure type Type
Bearing model
Wire rope
>14~19
>19~~24
>24~30
34~37
>37~~43
3.3 Marking
3.3.1 Model indication method
75~~110
110~140
160~170
160~190
160~190
JB/T 8398—96
Table 2 (constitutional)
90~110
110~130
94~110
96~108
108~124
130~140/110~126124-140
130~1401 26~134140~148
140~ 150 | | tt | |tt||4223242238
42 232~42 238
3.3.2 Marking example
JB/T8398—96
Wire rope and pulley diameter d×D, mm
"Integral
Rope bushing type opening N,
(two pieces N2
Bearing cover type
General seal type K
Tight seal type
(Sliding bearing A
Bearing type
Rolling bearing B, C
Wire rope diameter d2 4mm, pulley diameter D=560mmA-type pulley with integral rope lining is marked as: pulley YHAN24X560
Wire rope diameter d=20mm, pulley diameter D=500mmRolling bearing tightly sealed type, rope lining open type B-type pulley is marked as: pulley YHBK/N,20×500
Selection series and matching of diameter
The matching relationship between pulley diameter and wire rope diameter is shown in Table 3. The area enclosed by the black frame line in the table is the most commonly used matching range. 265
Pulley straight
JB/T8398-96
Note: The area with \×\ is the supply range of double-width plate pressing pulley. 266
JB/T8398--96
5 Technical requirements
5.1 Materials
The pulley material shall comply with the requirements of Table 4.
Parts name
Connecting pipe
Bearing cover
5.2 Appearance
JB/T 8398---96
Cast iron shall not be lower than HT200 in GB5675, zinc and zinc alloy shall not be lower than ZA27 in GB470 Structural steel shall not be lower than (Q235-B in B700 shall not be lower than HG2-868 Polyamide 6
Structural steel shall not be lower than Q235-B in GB700 Structural steel shall not be lower than Q235 in GB700
Cast iron shall not be lower than HT200 in GB5675
The pulley surface shall be smooth and flat, and shall not have defects that affect the performance and damage the appearance. 5.3 Dimensions, dimensional tolerances and surface roughness shall be manufactured in accordance with the drawings and technical documents approved by the prescribed procedures. The limit deviation of the rope groove radius shall be in accordance with GB/T180 4 in the v grade (coarsest grade), the unmarked surface roughness Ra (according to GB/T1031) is 25um. 5.4 Geometric tolerances
The geometric tolerances of the pulley shall comply with the provisions of Table 5 Table 5
CylinderbZxz.net
Line profile
Hub hole
Rope groove section
Geometric tolerance
Cylindricity tolerance!
=Tolerance zone of wheel
Line profile tolerance within the tolerance zone of rope groove radius:
≤Rope groove radius limit deviation
Circular runout
JB/T8398:96
Table 5 (end)
5.5 Assembly
5.5.1 All parts must be Assembly can only be carried out after the inspection by the inspection department has passed. 5.5.2 The expansion riveting of the connecting pipe should be firm and reliable to ensure the load-bearing capacity of the pulley. 5.5.3 The assembled pulley should be able to rotate flexibly. 5.6 Painting
Geometric tolerance
Pulley groove bottom circle runout tolerance 13:
5.6.1 The pulley must be cleaned before painting. Puttying is strictly prohibited. The paint should be solid, beautiful, smooth in appearance, and consistent in color, without marks, sagging, shrinkage, bubbles, shedding, roughness and inequality. 5.6.2 The unpainted parts of the pulley should be rust-proofed. 6 Tests
6.1 Static load test
10% but not less than 3 pulleys of each specification must be sampled for static load test. The test load is the rated load of the wheel. 1.4 times of the load (rated load of the pulley: 40% of the breaking tension of the matching maximum diameter wire rope according to the nominal tensile strength of 6×37 steel wire rope of 1670N/mm\). The test load is gradually added, and the load time shall not be less than 5min. After the test, the pulley shall not have cracks and permanent deformation, and shall not have damage that affects performance and safety.
6.2 Destruction test
Three samples shall be taken from each specification of pulley, one of which shall be subjected to a destructive test. If the requirements are not met, the test shall be doubled. If it still fails, it shall be redesigned. The test load is twice the rated load of the pulley. The test load shall be gradually added, and the load time shall not be less than 3min. The pulley is required to reliably support the load. 7 Inspection
7.1 Factory inspection
7.1.1 The pulley must be inspected and qualified by the inspection department of the manufacturer before it can be shipped. The factory-exported pulley must have a certificate of conformity. 7.1.2 Factory inspection items include appearance and dimension inspection, static load test (see 6.1), etc. The requirements for appearance inspection are as follows: a. All parts must not have harmful defects such as cracks and rust; b. The pulley appearance should be intact and the assembly should be correct. 7.1.3 Each pulley should be inspected for dimensions, technical requirements and markings, and meet the requirements of this standard. 7.2 Type inspection
Type inspection should be carried out in any of the following situations: 269
Trial design identification of newly produced pulleys; when there are changes in design, process and materials: b.
JB/T 8398--96
It should be carried out at least once a year during normal production; when the factory inspection results are significantly different from the first type inspection. 7.2.1 Inspection items include: appearance and dimension inspection, static load test and destructive test. 7.2.2 Inspection must be carried out by full-time inspection personnel. 8 Usage requirements
8.1 When the wire rope is wound into or out of the pulley groove, the maximum allowable angle of deflection (i.e. the angle between the center line of the wire rope and the plane perpendicular to the pulley axis) shall not exceed 5°
8.2 The ambient temperature of the pulley is -25~+90C. 8.3 The rope lining should be stopped when one of the following conditions occurs. The pulley can continue to be used after replacement: a.
When the thickness of the rope lining is worn to H2/2;
b. The two sides of the rope lining are worn to the wheel rim;
When the rope lining is used for three years.
8.4 The pulley should be stopped when one of the following conditions occurs: a.
When one of the rivet holes is loose;
When cracks appear:
Other defects that damage the wire rope;
When the rolling bearing is defective;
When the wall thickness of the sliding bearing is worn to 15% of the original wall thickness. 9 Marking, packaging, transportation and storage
9.1 Marking
Each pulley should have a permanent and clear pulley mark and manufacturer's mark. 9.2 Packaging
Pulley packaging should ensure that the pulley is not damaged or corroded, and comply with the provisions of GB/T13384. 9.3 Transportation
Pulleys are strictly prohibited from collision during transportation to prevent pulley damage. 9.4 Storage
Pulleys should be stored in a dry and ventilated place, and should not come into contact with corrosive substances, and should be protected from rain, snow, water and long-term exposure to sunlight. Additional notes:
This standard was proposed and approved by the Beijing Hoisting and Conveying Machinery Research Institute of the Ministry of Machinery Industry. This standard was drafted by the Beijing Hoisting and Conveying Machinery Research Institute of the Ministry of Machinery Industry and Zhejiang Ningbo Special Pulley Co., Ltd. The main drafters of this standard are Wu Suoyun and Chen Xitao. 270
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