JB/T 8545-1997 This standard specifies the specifications, dimensions, chain length accuracy, ultimate tensile load, accessory type and sprocket parameters of escalator step chains. This standard applies to escalator conveyor chains with steps, and also applies to conveyor chains for moving walkways. JB/T 8545-1997 Escalator step chains, accessories and sprockets JB/T8545-1997 Standard download decompression password: www.bzxz.net

JB/T8545-1997
This standard is proposed and managed by the National Chain Drive Standardization Technical Committee. The responsible drafting units of this standard are: Chain Drive Research Institute of Jilin University of Technology, Hangzhou Dunpai Chain Drive (Group) Company. The participating drafting units of this standard are: General Machinery Factory of Dagang Petroleum Administration Bureau, Wujin Chain Factory, Shanghai Changjiang Chain Factory. The main drafters of this standard are: Meng Xiangbin, Li Daming, Wang Yanping, Tan Guangcheng. The participating drafters of this standard are: Zhang Hansheng, Zhao Sailiang, Sui Xuemin. 297
1 Scope
Machinery Industry Standard of the People's Republic of China
Escalator stcp chains, attachments and sprockets
Escalator stcp chains, attachments and sprocketsJB/T 8545- -1997
This standard specifies the specifications, dimensions, chain length accuracy, ultimate tensile load, attachment type and sprocket parameters of escalator step chains. This standard applies to escalator conveyor chains with steps and also to conveyor chains of moving walkways. 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. Parties using this standard should explore the possibility of using the latest versions of the following standards. ISO606:1994 Short pitch precision roller chains and sprockets for transmission 3 Chains
3.1 Definitions
This standard adopts the following definitions.
3.1.1 Chain length synchronization accuracy
The difference in actual chain length between two step chains on the same escalator within the measurement length specified in this standard. 3.1.2 Step pitch
The chain length required to install one step. The step pitch is an integer multiple of the nominal pitch of the step chain. 3.1.3 Step pitch synchronization accuracy
The difference in actual length between two chains installed on the same step. 3.1.4 Other terms for chains
For other terms for chains, see Figure 1, Figure 2 and Table 1, Table 2. 3.2 Structural type and size
The basic structure of the step chain is shown in Figure 1 and Figure 2. The main dimensions of the step chain shall comply with the provisions of Table 1 and Table 2. The maximum and minimum dimensions specified in the table are to ensure the interchangeability of step chain links manufactured by different manufacturers. They are the limit dimensions of interchangeability, not the tolerances during manufacturing.
Approved by the Ministry of Machinery Industry of the People's Republic of China on April 15, 1997 298
Implemented on January 1, 1998
JB/T 8545 --- 1997
Figure 1 Basic structure of step chain
According to user requirements, the chain plates or rollers can be made into Figure 2 or other shapes. The type of rivet head can also be determined according to user requirements, but the firmness of the rivet head must be guaranteed
Step chain (8-shaped chain plate)
2(0007
Cotton chain (large roller or thick chain with bearing) Figure Other types of step chain
ST100A
ST100B
ST100Ci
ST10OD
ST100E
ST100F
JB/T8545-1997
Main dimensions, measuring load, tensile load and accessories of chain Type table 1
(Applicable to escalators with a step pitch of 400mm)Inner chain link
Note: The additional width of the locking piece is determined by the manufacturer and the userInner chain link
Outer chain link
Tensile「Accessories」
Load「Type!
Table 2 Main chain dimensions, measured load, tensile load and accessory type (Applicable to escalators with a step pitch of 406.4mm and other step pitches)Chain
ST10IB1101
ST135A
"Roller
ST135B1 135. 46
ST135C135. 73
Inner link pin
Main: Positive locking element Additional width determined by manufacturer and user
Inner link
Outer link
Tensile strength accessory
Load type
Step distance
Number of links
Step distance
Number of links
3.3 Marking method
The marking of step chain is as follows:
Marking example:
JB/T 8545 -- 1997
JB/T8545
Standard number
Accessory type
Sequence symbol
Step chain
Step chain manufactured according to this standard, with a pitch of 100, has a sequence symbol of F, an accessory type of W, and 248 sections per chain. It is marked as: ST100FW×248JB/T8545
3.4 ​​Tensile load
The manufacturer must conduct a tensile load test on each batch of step chains. The length of the test chain segment should have at least 3 free links and both ends should be inner links. The two ends of the chain segment are connected to the chuck of the testing machine with a pin through the chain plate hole or a sleeve. The chuck design should minimize the additional load on the tested chain segment, and its specific type shall be determined by the manufacturer. If the specimen is damaged at the connection with the chuck, the test is invalid. 3.5 Chain length accuracy
The length accuracy of the chain should include the chain length deviation of each chain, the chain length synchronization accuracy of a pair of step chains on the same escalator, and the synchronization accuracy of the step pitch. The synchronization accuracy requirements specified in this standard are the minimum requirements, and the manufacturer can improve this requirement according to user requirements and its own manufacturing level.
3.5.1 Chain length deviation
The actual chain length deviation value measured shall not exceed +0.15% relative to the nominal size of the measured length. The chain length for measurement shall not be less than 5 ladder pitches, and the chain shall be supported and straight along the entire length without lubrication. The applied measurement load shall comply with the provisions of Tables 1 and 2. 3.5.2 Chain length synchronization accuracy
The chain length synchronization accuracy shall not exceed 0.4 mm. 3.5.3 Step pitch synchronization accuracy
Step pitch synchronization accuracy should not exceed 0.4mm. 3.6 Pins and connection forms
The pin ends should be firmly connected to the outer chain plate. Install removable links where necessary according to the form of the accessories. 3.7 Transition links
Transition links are specially set up to obtain odd-numbered links (see Figure 3). 3.8 Marking
Chains and outer packaging should be marked as follows:
a) Manufacturer's name or trademark;
b) Chain number in Table 1 and Table 2.
4 Accessories
JBT8545
Figure 3 Transition links
Accessories are set up to install the steps of escalators. According to the requirements of the escalator manufacturer, the accessories can be divided into three types: DW and Y. The structure and name of the accessories are shown in Figure 4. The size and requirements of the accessories can be agreed with the escalator manufacturer. Center pin type (W type)
00000000
Pin extension type (1) type)
Figure 4 Appendix "Types"
5 Sprocket
5.1 Definition
JB/T 8545-
Inner link hole type (Y type)
Figure 4 (end)
The definitions of sprockets are listed in Figures 5, 6 and the following. Chain pitch, b tooth width:.-· Tooth side flange fillet radius: tooth side chamfer;-
d: pitch circle diameter; r. Tooth surface arc radius; d-tooth top circle diameter:-tooth groove circle grasping radius: d--tooth root circle diameter; r-tooth side chamfer radius; d.-maximum tooth side flange diameter-has Effective number of teeth: d.—maximum roller diameter α\tooth groove angle h.-indexing chord tooth height Figure 5 Tooth groove shape and axial tooth profile
5.2 Tooth shape and size
5.2.1 Pitch circle diameter:
Measuring cylinder diameter:
5.2.3 Tooth root circle diameter:
5.2.4 Measuring cylinder distance
d==p/sin(180°/)
Tolerance is +? °mm
dr =d tunx
did-d:mox tolerance is hi
For sprockets with even number of teeth:
Mr =ddRmbZxz.net
For sprockets with odd number of teeth: Mr-md·cos（90\/）+ch.To measure the distance between the measuring rods of even-numbered teeth, two measuring rods must be placed in two symmetrical tooth grooves: To measure the distance between the measuring rods of odd-numbered teeth, two measuring rods must be placed in the two tooth grooves that are closest to symmetry: 303
JB/T8545—1997
The limit deviation of the distance between the two measuring rods is the same as the deviation of the corresponding root circle diameter. Even-numbered teeth
Odd-numbered teeth
dr-diameter of measuring rod td--pitch circle diameter: MR--measuring rod distance: dt--root circle diameter p chord pitch, equal to the chain pitch. Figure 6 Measuring rod distance
5.2.5 Tooth tip circle diameter and tooth height
This standard does not specify the tooth tip circle, but the height of the tooth tip shall not exceed the height of the inner chain plate above the pitch circle chord line. 5.2.6 End face tooth shape
The actual tooth shape produced by cutting tools or equivalent methods shall have a tooth profile between the minimum tooth shape and the maximum tooth shape. The tooth shape of the sprocket used for the step chain with Y-type attachments shall be made in the form of Figure 7 according to the chain. The number of teeth on the sprocket shall be an integer multiple of the number of chain links between the attachments.
Figure? Sprocket tooth profile for Y-type attachments 5.2.6.1 Minimum tooth groove shape
remax = 0. 12d, (z + 2)
rimin = 0. 505d,
αmx140°--(90/z)
5.2.6.2 Maximum tooth groove shape
5.2.7 Axial tooth profile
5.2.7.1 Tooth width:
JB/T 8545: 1997
remin=0.008d, (2+180)
rimx = 0. 505dl + 0. 069 Vdlαmin = 120°-(90°/z)
bimax = 0. 9b, -- 1
bimin=0.87b,1.7 mm
b tolerance is h14
5. 2. 7.2
Tooth side chamfer radius:
Tooth side chamfer width:
5.2.7.4Maximum tooth side flange diameter:
dp·cot(180°/z)-hz—2ra
For large roller chains, the inner link plate height h2 in the formula should be changed to the roller diameter dl. When the chain attachment type is Y-type, the value of hz should be the height of the inner link plate with holes. 5.2.8 Radial runout
The radial runout between the hole and the tooth root circle should not exceed the 10th grade accuracy. 5.2.9 End runout
The axial runout between the hole and the tooth side should not exceed the 10th grade accuracy. 5.3 Hole Tolerance
The hole tolerance is generally H8, but can also be determined based on the agreement between the manufacturer and the user. 5.4 Marking
The sprocket and the outer packaging must be printed with the following markings: a) manufacturer name or trademark;
b) number of teeth;
c) chain code.
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