This standard specifies the product classification, technical requirements, test methods, inspection rules, etc. of chain guide rollers. This standard is applicable to rollers used for anchor chain guides on small and medium-sized ships. CB/T 290-1995 Chain guide rollers CB/T290-1995 Standard download decompression password: www.bzxz.net

Shipbuilding Industry Standard of the People's Republic of China
CB/T 290--1995
Published on 1995-06-19
Implemented on 1996-04-01
Published by China State Shipbuilding Corporation
Shipbuilding Industry Standard of the People's Republic of China
Subject Content and Scope of Application
This standard specifies the product classification, technical requirements and inspection rules for chain guide rollers. This standard applies to rollers used for anchor chain guides on small and medium-sized ships. 2 Product classification
2.1 The structural type and main dimensions of the chain guide wheel shall be as shown in Figure 1 and Table 1.A
Marking
Chain guide
CB/T290-1995
Classification number: U21
Replaces CB'290-84
1—roller; 2—pin shaft; 3—straight-through oil cup; 4 bracket; 5—sleeve; 6—stop plate; 7—screw + 8 spring washer Approved by China State Shipbuilding Corporation on June 19, 1995 and implemented on April 1, 1996
Applicable chain diameter
30～32
The dimensions of the bracket shall be as shown in Figure 3 and Table 3.
CB/T 290—1995
2041232
Weight.kg
Applicable chain diameter
38~-40
42--44
The dimensions of the pin shall be in accordance with Figure 4 and Table 4.
CB/T290---1995
Weight, kg
Model Applicable chain diameter
30～32
The dimensions of the bushing shall be in accordance with Figure 5 and Table 5.
c;×45
CB/T290—1995
Weight.kg
Extended chain diameter
58~-60
The dimensions of the roller shall be in accordance with Figure 2 and Table 2.
CB/T 290-1995
Weight, kg
Applicable chain diameter
22~2-1
2.6The size of the stopper plate shall be in accordance with Figure 6 and Table 6.
CB/T 290-1995
Weight, kg
2.7Marking example
Applicable chain diameter
38~-15
Chain guide roller of model 40:
Chain guide roller
40CB/T290 -1995
3 Technical requirements
CB/F 290--1995
3.1The materials of the main parts of the chain guide roller shall be in accordance with the provisions of Table 7. Table 7
High-quality carbon steel
Casting alloy
Bracket, stop plate
Fengtong carbon steel
Stainless steel
2G 200-100C
ZCuZn4nMn2
Q235-A
:r18NigTi
Weight, kg
Standard number
CB772-86
CB 699--88
GB1176-87
GB700--88
GB1220-84
3.2 All surfaces of the guide chain roller shall be smooth. The casting shall not have defects that affect the strength, such as pores, sand holes, inclusions, looseness, cracks, etc. CB/T290-1995bZxz.net
3.3 The chain roller should be able to rotate flexibly after assembly, and the contact surface of its rotating parts should be greased. After the bracket is made, remove rust and apply anti-rust paint. 3.4
Inspection rules
The chain roller should be inspected and accepted by the inspection department of the manufacturer according to technical requirements, and a certificate of conformity should be issued. 4.1
4.2 The inspection content should be in accordance with the requirements of 3.2 to 3.4. 5 Marking
The chain roller after acceptance should have the following markings: a.
Manufacturer name or mark:
Model and standard number:
Production batch number or production year and month;
Inspection pass stamp.
Additional instructions:
This standard is proposed by the National Technical Committee for Ship Drying Standardization. This standard is under the jurisdiction of Jiangnan Shipyard.
This standard was drafted by Dalian Ship Design Institute. The main drafter of this standard is Sun Chengwen.
This standard was first issued in 1976 and revised for the first time in 1984. The main contents of this revision:
The ratio of roller to chain diameter is increased, and the size of the pin is also increased accordingly. The material of the roller is changed from ZG25 to ZG200-400C, and the material of the pin is changed from 25 steel to 35 steel. There is a gap of 0.5~1.5mm between the pin and the bushing, and the bracket structure type is changed.
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