JB/T 5253.3-1991 Technical conditions for random special tools for steam turbines Cylinder lifting tools JB/T5253.3-1991 Standard download and decompression password: www.bzxz.net

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Pressing Machinery Ring Industry Standard of the People's Republic of China JB/T5253.31991
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This standard specifies The basic form and technical requirements of steam turbine cylinder lifting tools are explained. JB/T5253.31991
This standard applies to the design, manufacture and inspection of steam turbine cylinder lifting tools (hereinafter referred to as lifting tools). Reference standards
GB1102 round strand steel wire rope
GB5972 Practical specification for inspection and scrapping of steel wire ropes for lifting machinery GB6946 aluminum alloy pressed joints for steel wire ropes
JB2901
JB2862
3 Structural form
3.1
Technical conditions for steam turbine rust prevention
Technical conditions for steam turbine packaging
Three-point type (Figure 1)
Travel hook||tt| |Adjusting mechanism
Wire rope
Cylinder
Picture
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1991-07-01Rat
1992-07-01|| tt||3.2 four-point type (Figure 2)
4 technical requirements
Huan research
JB/T5253.31991
driving hook
adjustment Mechanism
Wire rope
Cylinder
Figure 2
4.1. The load of each wire rope should be determined based on the structure of the lifting tool, the weight of the lifted cylinder and the lifting position. The selection of the tensile force and the diameter of the wire rope and the number of strands should ensure a sufficient safety factor at the maximum load. Generally, the value is not less than 7. The wire rope should comply with the relevant regulations of GB1102.
The thimble of the wire rope should have sufficient braiding length, which should not be less than 15 times the diameter of the wire rope, and should not be less than 300mm. 4.2
4.3 When the lanyard of the steel wire rope adopts aluminum alloy pressed joint, it shall comply with the relevant regulations of GB6946. 4.4 The lifting tool should have at least one wire rope that can be adjusted in the height direction. 4.5 The adjustment mechanism should be designed according to the maximum design load. 5 Inspection and testing
5.1 The steel wire rope shall be inspected in accordance with the relevant provisions of GB5972. 5.2 The lifting tools shall undergo a load-bearing test. The external load shall not be less than 1.5 times the actual load and the time shall not be less than 15 minutes. Visually inspect the wire rope to see if there are any abnormalities such as breakage or looseness, and there must be no cracks on the surface of the adjusting mechanism parts. 6 Rust prevention, packaging and storage
6.1 The parts of lifting tools should be rust-proofed in accordance with the relevant provisions of JB2901. 6.2 Lifting tools shall be packed randomly according to the relevant provisions of JB2862. 6.3 Lifting tools should be placed in a dry and ventilated place and placed on a bracket. Wire ropes should be protected from damage and rust and kept well lubricated. Additional notes:
This standard is proposed and administered by the Shanghai Power Generation Equipment Complete Design Institute of the Ministry of Mechanical and Electronic Industry. This standard was drafted by Dongfang Steam Turbine Factory and Shanghai Power Generation Equipment Complete Design Institute. The main drafters of this standard are Yang Ruifu, Ren Qihua, and Fang Chonghua. 2wwW.bzxz.Net
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