JB/T 5253.2-1991 Technical conditions for random special tools for steam turbines Rotor lifting tools JB/T5253.2-1991 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/T5253.21991
1991-07-014
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This standard specifies the lifting tools for steam turbine rotors Basic type and technical requirements, JB/T5253.21991
This standard applies to the design, manufacture and inspection of steam turbine rotor lifting tools (hereinafter referred to as lifting tools). Reference standards
2
GB231
GB699
GB1102
GB 1591
GB5972
GB6946
JB2900
JB2901
JB2862
3 structural forms
Metal Brinell hardness test method
Technical conditions for high-quality carbon structural steel
round Stranded wire ropes
Low alloy structural steel
Practical specifications for inspection and scrapping of steel wire ropes for hoisting machinery
Technical conditions for steam turbine paint
Technical conditions for rust prevention of steam turbines
Technical conditions for steam turbine packaging
3.1 Non-adjustable rotor lifting tool (see picture) traveling hook
Working beam
Handle
Lifting block (or Hook)
, wire rope
P rotor center
1991-07-01 rat
rotor
1992-07-01
3.2 Adjustable rotor lifting tool
JB/T5253.21991
The basic structure is the same as 3.1, but the axial position on the working beam must be freely adjustable to adapt to different lengths of rotors of the same unit. Lifting needs are required when the cylinder is uncovered, and clear position markings (such as high, medium, and low) should be made. Technical Requirements
4.1 Design Requirements
4.1.1 The strength of the parts of the lifting tool must meet the load requirements and have a sufficient safety factor when lifting. The main load-bearing components should be subject to strength calculation. For a unit with multiple rotors, when using the same lifting tool, the design should be based on the rotor with the largest weight in the unit.
4.1.2 When designing, the extension line of the lifting center of the crane hook should pass through the theoretical center of gravity of the rotor (see figure). 4.1.3 Select or design the size and structure of the lifting block (or hook) according to the maximum design load. 4.1.4 The stability and deflection of the working beam should be calculated, and its structure should have sufficient stability under the maximum load; the deflection value should not be greater than L/700 (L is the maximum span of the working beam). 4.1.5 The diameter and number of strands of the wire rope should be selected to ensure a sufficient safety factor at the maximum load. Generally, the value should not be less than 6. The steel wire rope should comply with the relevant regulations of GB1102.
4.1.6 The thimble of the steel wire rope should have sufficient braiding length, which should not be less than 15 times the diameter of the steel wire rope, and should not be less than 300mm. 4.1.7 When the ferrule of the steel wire rope uses an aluminum alloy pressed joint, it should comply with the relevant regulations of GB6946. 4.1.8 The lifting tool should have at least one wire rope that can be adjusted in the height direction. When the working beam adopts a welded structure, strict welding process specifications should be formulated to ensure the welding quality. The welding deformation shall not exceed the requirements in Figure 4.1. 9
, and stress relief annealing should be performed in a timely manner after welding. 4.2 Materials
4.2.1 The material of the working beam shall be low carbon steel or low alloy steel profiles. Low carbon steel generally uses 20 steel, and the technical conditions should comply with the regulations of GB699; low alloy steel generally uses 16Mn steel, and the technical conditions should comply with the regulations of GB1591. 4.2.2 The lifting block (or hook) is made of forgings, and the material is generally 20 steel. The technical conditions should comply with the regulations of GB699. 5 Inspection and testing
5.1 Visual inspection of working beams shall not reveal any defects such as cracks. 5.2 The surface of the hanging block (or hook) should be smooth and clean, without peeling, sharp corners, burrs, cracks, etc. 5.3 The hardness of the hanging block (or hook) should be 100% checked after heat treatment. The hardness test shall be carried out in accordance with the relevant provisions of GB231. 5.+ Steel wire ropes should be inspected in accordance with the relevant regulations of GB5972. $.5 Lifting tools should undergo a load-bearing test, and the external load should not be less than 1.5 times the actual load, and the time should not be less than 15 minutes. Visual inspection of the wire rope should be conducted without any abnormality such as breakage or loosening. There should be no cracks in the beam welds and main load-bearing parts, and the deformation should not exceed the provisions of Article 4.1.4. 6 Paint, rust prevention, packaging, storage
6.1 The non-processed surfaces of lifting tool parts shall be painted in accordance with the relevant provisions of JB2900. 6.2 The processed surface shall be rust-proofed in accordance with the relevant provisions of JB2901. 6.3 Lifting tools can be installed naked or in boxes according to the relevant provisions of JB2862. 6.1 Lifting tools should be placed in a dry and ventilated place and placed on a bracket. The wire rope should be prevented from damage and rust, and maintained in a good lubrication state. 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 is 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. 2
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