JB/T 8920-1999 JB/T 8920-1999 Engineering plastic inner link light conveyor chain JB/T8920-1999 Standard download decompression password: www.bzxz.net

JB/T8920
This standard is proposed and managed by the National Technical Committee for Chain Transmission Standardization. The responsible drafting unit of this standard is Suzhou Special Chain Factory. The main drafter of this standard is Bao Weilie
. The participating drafters of this standard are Huang Xianghong, Li Daxiong, Shang Dengcai, Yin Yongyi and Sui Xuemin. This standard was first issued on June 28, 1999. 315
Machinery Industry Standard of the People's Republic of China
Engineering plastics inner link light-duty conveyor chains
Engineering plastics inner link light-duty conveyor chains JB/T 8920—1999
This standard specifies the structure, dimensions, minimum tensile load and chain length accuracy of engineering plastics inner link light-duty conveyor chains. This standard applies to light chains with integral engineering plastic inner links for conveying. 2 Referenced standards
The clauses contained in the following standards constitute the clauses of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards are subject to revision, and parties using this standard should explore the possibility of using the latest versions of the following standards GB/T1243-~1997 Precision roller chains and sprockets for short pitch transmission GB/T6076:~1985 Precision short pitch simple chains for transmission GB/T9785--1988 Terminology of chains and sprockets 3 Chains
3.1 Terminology of chains and their components
The terminology of chains and their components is shown in Figure 1 and is in accordance with the provisions of GB/T9785. Figure 1 does not show the actual shape of the provisions. External link plate
a) Assembled external link
Connecting pin
Elastic lock
Approved by the State Bureau of Machinery Industry on 1999-06-28 316
) Disassembled connecting link
Figure 1 Chain link structure typewww.bzxz.net
b) Integral internal link
External key plate
Connecting link plate
2000-01-07 implementation
IB/T 8920
3.2 Dimensions
Chains shall conform to the dimensions specified in Figure 2 and Table 1. The maximum and minimum dimensions specified are to ensure that the products manufactured without interruption have link interchangeability. They are interchangeability limits, not manufacturing tolerances. 000000
Figure 2 Chain
Inner link
04CPSa/Sm
06CPSa/Sm
08APSa/Sm
10APSa/Sm
12APSa/Sm
Main dimensions, tensile load and allowable tension of chain sleeve
Connecting pin Inner link plate Inner link plate Outer link plate Outer link plate Allowable shaft length
18.812.07
Allowable tension is a reference value, which shall be ultimately determined by the designer according to the minimum tensile load and safety factor based on the specific usage. 2 Chain use temperature: -10~+80℃80
The connecting links of 308APSa/Sm~12APSa/Sm chains are basically the same as those of stainless steel short pitch precision roller chains; while 04CPSa/Sm and 06CPSa/Sm chains must use special connecting links4 Such chains have no transition links, so the entire chain must be an even number of links. 3.3 Tensile load
3.3.1 The minimum tensile load of the chain is the tensile load value that must be achieved when the sample chain is subjected to the tensile test in accordance with 3.3.2. This minimum tensile load is not a working load, it can only be used as a comparison between chains of different structures and materials. As for the information on the use of the chain, you should consult the chain manufacturer or refer to the data they provide. 3.3.2 The tensile load during the tensile test shall not be less than the minimum tensile load value specified in Table 1, and shall be slowly applied to both ends of the chain. The length of the test chain shall not be less than 7 chain pitch values, and the two ends shall be outer links. The clamp used shall enable the chain to rotate freely along both sides of the chain centerline in the normal plane of the hinge. If damage occurs at the link connected to the clamp, the test is invalid. 3.3.3 The tensile test is a destructive test. Even if the chain does not suffer obvious damage after being subjected to the minimum tensile load, the chain is damaged after being subjected to the force. Therefore, the chain that has been subjected to the tensile test cannot be used again. 3.4 Chain length accuracy The chain length accuracy should be measured. The minimum number of measured links and the applied measuring force for chains of different specifications shall comply with the provisions of Table 2. The chain to be measured shall be supported over its entire length and both ends of the chain shall be inner links. The deviation of the actual chain length measured shall not exceed ±0.2% of the nominal dimension of the measured length. Table 2 Number of measured links, measuring force and chain length accuracy Chain number
04CPSa/Sm
06CPSa/Sm
08APSa/Sm
10APSa/Sm
12APSa/Sm
4 Accessories
4.1 General rules
Number of measured links
Measuring force
Unless otherwise specified, the characteristics, dimensions and tests of chains with accessories are the same as those required in Chapter 3. 4.2 Types of accessories
There are three types of accessories, with the following characteristics and codes: Type K1 and Type A1: with horizontal wing attachment, with: · attachment hole in the center of the wing (see Figure 3). Chain length accuracy
615.95±1.232
619.125±1.238
622.3±1.245
619.125±1.238
628.65-1.257
H1 and HA: with vertical extension chain plate attachment, there is an attachment hole in the center of the extension chain plate (see Figure 4). D1 and DA: with extended pin attachment (see Figure 5). 4.3 Attachment size
Attachment size shall comply with the provisions of Tables 3 to 5. Among them, the attachment span W and attachment width u1 in Table 3, the attachment height X and attachment width u in Table 4, and the extended pin length b in Table 5. It can also be determined by the manufacturer, but it should be noted that it should not interfere with adjacent chain links during operation.
JB/T 8920—1999
a) Type K1 - Chain with horizontal wing attachments on both sides
b) Type 1 - Chain with horizontal wing attachment on one side Figure 3 Chain with horizontal wing attachment
JB/T 8920 --1999
Chain with vertical extension plates on both sides
a) Type HK1
b) Type HA1 - Chain with vertical extension plates on one side Figure 4 Chain with vertical extension plates
JB/T 8920 1999
a) DK type - chain with extended pins on both sides b) DA type
Chain with extended pins on one side
Chain with extended pins
04CPSa/SmK1/A1Jn
06CPSa/SmK1/A1Jn
08APSa/SmK1/A1Jn
10APSa/SmK1/A1Jn
12APSa/SmK1/A1Jn
04CPSa/SmHK1/HA1J n | | tt | ||10APSa/SmDK/DAJn
12APSa/SmDK/DAJn
JB/T 8920-1999
Dimensions of horizontal wing attachments
Platform height
Horizontal distance between hole centers
Dimensions of vertical extension chain plates
Hole center height
Attachment height
Table 5 Dimensions of extension pins
Attachment span
Extension pin diameter
Attachment width
Attachment width
Extension pin length
5 Marking and marking
5.1 Marking method
JB/T8920
The marking provisions for engineering plastic inner link light conveyor chains manufactured in accordance with this standard are as follows: Standard number
Number of links in the whole chain
The number of pitches between repeated appearances of the same attachment is expressed as Jn, where n is the number of pitches,The type of second-level accessories is represented by the code of 4.2 accessory type, such as K1, HA, etc. The material of the outer link plate and pin is represented by Sa, which is austenitic stainless steel, and Sm, which is martensitic stainless steel. The material of the integral inner link is represented by P, which is engineering plastic. The chain number is represented by the chain number of the short-pitch precision roller chain or bushing chain (GB/T1243, GB/T6076) with the same main dimensional parameters. Marking example: Chain number 06C, outer link plate and pin material is austenitic stainless steel, single-side with single-hole horizontal wing plate attachment, and attachments are repeated every 4 pitches, the whole chain has 82 engineering plastic inner links. The light conveyor chain is marked as: 06CPSaA1J4X82 JB/T 8920---19995.2 Marking
Chains shall be marked as follows:
a) manufacturer's name or trademark;
b) chain number, material and accessory type as specified in 5.1. 323
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