This standard is an amendment to ZB J62 006.3-87 "Barrier shear noise limit for bar shears, crocodile shears and shears" for forging machinery noise limits. This standard and the technical content of ZB J62 006.3-87 are basically the same, only according to the relevant provisions of the re-edited. Appendix A A1 Any newly prototyped or improved prototype, a small batch of trial-produced new products, or the first batch of bar shears, crocodile shears, and shears produced after the change of process, materials, and quality rating, Performance testing of the cutting material shears, crocodile shears, shears products, should determine the noise sound pressure level, it is recommended to determine the noise power level.
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This standard has been implemented since January 1, 2000.
This standard replaces ZB J62 006.3-87 from the date of implementation.
Appendix A of this standard is an appendix to the standard.
This standard was proposed and managed by the National Standardization Technical Committee of Forging Machinery.
This standard is drafted by: Jinan Foundry Forging Machinery Research Institute.
This standard was first released in April 1987.
1 Scope This standard specifies noise limits for the sound power level and sound pressure level of bar shears, crocodile shears, and shears.
This standard applies to bar shears, crocodile shears, shears.
2 Reference Standards The following standards contain provisions that, through reference in this standard, constitute provisions of this standard. At the time of publication, the editions indicated were valid. All standards will be revised and all parties using this standard should explore the possibility of using the latest version of the following standards.
JB/T 3623—1984 Measuring method of forging machinery noise 3 Barrier shear noise limit 3.1 Barber shearing noise A-weighted sound power level LwA during continuous air running shall not be greater than that specified in Table 1. 
3.2 The noise-weighted sound pressure level LpA at the specified position of bar shears in continuous operation shall not exceed 95 dB(A).
3.3 The LpA1 should not exceed 106 dB(A) in the sound pressure level of the impulse noise when the bar shear is in single-load operation.
4 Noise limit value of crocodile shears 4.1 The noise A-weighted sound power level LWA of the crocodile type shear shall not exceed 105 dB(A) when it is continuously running.
4.2 The noise A-weighted sound pressure level LpA of the alligator-type shear at a specified position during continuous operation shall not exceed 90 dB(A).
5 Noise Limit of Shears 5.1 The noise-weighted sound power level LWA of the shears in continuous operation shall not be greater than those specified in Table 2. 
5.2 The noise level A sound pressure level LpA at the prescribed position of the shears in continuous operation shall not be greater than that specified in Table 3. 
5.3 LpA1 shall not be greater than the stipulated in Table 4 for the impulse noise A-weighted sound pressure level at the specified position when the shears are unloaded for a single stroke. 
6 Measurement method The measurement method of this standard shall be as specified in JB/T 3623.
7 Instructions for use Refer to Appendix A (Appendix of the standard) for instructions on the use of this standard.
(standard appendix)
The use of this standard
A2 Bar cutting, crocodile shearing and shearing products that are normally mass-produced can only measure the noise sound pressure level at the factory inspection.
The wire rope used in tower cranes is typically made up of multiple strands of steel wires twisted together to form a strong and durable rope. The number of strands and wires in the rope can vary depending on the specific requirements of the crane.
Tower crane wire ropes are designed to withstand high loads and provide excellent resistance to abrasion, fatigue, and corrosion. They are also engineered to have a high breaking strength to ensure safety during lifting operations.
Regular inspection and maintenance of the wire rope is crucial to ensure its safe and efficient operation. This includes checking for signs of wear, corrosion, or damage, as well as lubricating the rope to reduce friction and prolong its lifespan.
Overall, wire rope is a critical component of tower cranes, providing the necessary strength and reliability to handle heavy lifting tasks in construction and other industries.