This standard specifies the product classification, technical requirements, test methods, inspection rules, marking and packaging of spring towing hooks. This standard applies to spring towing hooks for ship towing. CB/T 637-1995 Spring towing hook CB/T637-1995 Standard download decompression password: www.bzxz.net

Shipbuilding Industry Standard of the People's Republic of China
CB/T637-1995
Issued on December 19, 1995
China State Shipbuilding Corporation
Implementation on August 1, 1996bzxz.net
Shipbuilding Industry Standard of the People's Republic of China
Subject content and scope of application
CB/T637-1995
Classification number: U24
Replaces CB·637-78
This standard specifies the product classification, technical requirements, test methods, inspection rules, marking and packaging of spring towing hooks. This standard applies to spring towing hooks for ship towing. 2 Product classification
2.1 Structural type See Figure.i
1-handle; 2-hook, 3-handle pin; 4-gate pin; 5-hook pin 6-gate 7-gate frame 8-hook plate; 9-stop pin; 10-hook plate pin; 11-gate frame pin; 12-clamp; 13-clamp pin, 14-spring mandrel; 15-roller bracket; 16-roller, 17-roller pin; 18-spring; 19-spring pressure plate; 20-spring seat; 21-spring frame pin; 22-spring frame, 23-cross joint, 24-cross joint pin; 25-eye plate, China State Shipbuilding Corporation approved on December 19, 1995 and implemented on August 1, 1996
Main parameters are shown in Table 1.
Allowable load
2.3 Marking example
Spring tow hook with an allowable load of 25kN:
Spring tow hook
3 Technical requirements
25CB/T637—1995
CB/T637-1995
3.1 The materials of the main parts of the spring tow hook shall comply with the requirements of Table 2. B
Part name
Roller pin
Hook pin
Stop hook pin
Clamp pin
Spring mandrel
Cross joint pin
16~220 Spring hook material
Carbon structural steel
Spring steel
Q235-A
60Si2Mn
GB700—88
GB1222——84
320, 400 Spring hook material
High-quality carbon structural steel
Alloy structural steel
Spring steel
3.2 The surface of the parts should be smooth and no defects such as burrs, marks, sharp corners and cracks are allowed. Brand
60Si2Mn
3.3 The weld seam of the welded parts shall be uniform and free from defects such as pores, spatter, slag, undercut, cracks, etc. that may affect the performance and appearance. 3.4 After assembly, all rotating parts shall be able to rotate flexibly, and the springs shall be able to retract freely without any jamming. Standard
GB699—88
GB3077—88
GB1222—84
3.5 After the spring tow hook is assembled, a tensile test and a decoupling test shall be performed; the tensile test load shall be twice the allowable load, and the decoupling test load shall be the allowable load.
4 Test method
CB/T637-1995
4.1 Tension test: Place the spring tow hook on the test bench in working state, check whether the hook can rotate up and down and left and right flexibly, then gradually and evenly apply tension. When the tension reaches the tension test load specified in 3.5, keep it for 5 minutes. After the test, all parts should not have permanent deformation, cracks and other defects.
4.2 Unhooking test: When the tension gradually and evenly reaches the unhooking test load specified in 3.5, open the handle and the hook should be able to unhook. 5 Inspection rules
5.1 Each product must be inspected and qualified by the inspection department, and a product certificate must be issued. It can only be shipped after approval by the ship inspection. 5.2 The materials of the main parts must comply with the provisions of 3.1. 5.3 The surface and welds of the parts must meet the provisions of 3.2 and 3.3. 5.4 The assembly must meet the provisions of 3.4.
Each product shall be subjected to tensile test and unhooking test according to the provisions of 4.1 and 4.2. 5.5
Marking and packaging
The qualified spring towing hook shall have the following markings: 6.1
Manufacturer name,
Product model;
Test year and month;
Ship inspection pass stamp.
6.2 Packaging
The packaging box shall be firm and reliable, and the following contents shall be marked on the outside of the packaging box: a.
Name and address of the receiving unit;
Name and address of the sending unit;
Product name;
Factory number and date;
Total weight.
Additional remarks:
This standard is proposed by the National Technical Committee for Ship Drying Standardization. This standard is under the jurisdiction of Jiangnan Shipyard.
This standard is drafted by Donghai Shipyard. The main drafters of this standard are Zhang Jiqiang, Yang Aiguo and Luo Chunyan. Published by China Standards Press
China Standards Press Qinhuangdao Printing Factory First edition in August 1996 First printing in August 1996. Book number: 155066·2-109756191
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