Views: 2089 Author: Site Editor Publish Time: 2024-10-28 Origin: Site
Rotary joint is an important pipeline connection device that can achieve relative rotation of connected pipelines and transmit various media such as gas, liquid, oil, etc. The following is a detailed introduction to rotary joints:
Rotary union, also known as a rotary joint, is a closed rotary connector that rotates 360 ° to transport media. Its main function is to input liquid, gas and other media from the stationary end of the pipeline into rotating or reciprocating equipment, and ensure that the media does not leak during transmission. Rotary joints are widely used in various rotating or reciprocating equipment that requires fluid transmission, such as CNC machine tools, printing machinery, packaging machinery, construction machinery, etc.
Rotary joints can be classified into various types according to different classification criteria:
1) Classified by fluid medium: including hydraulic rotary joints, thermal oil rotary joints, water rotary joints, steam rotary joints, compressed air rotary joints, etc.
2) Classified by the number of connecting pathways: single channel rotary joints, dual channel rotary joints, and multi-channel rotary joints (three or more pathways).
3) Classified by sealing form: including ring sealed rotary joints, mechanical sealed rotary joints, and gap sealed rotary joints.
4) Classified by bearing pressure: divided into negative pressure, low pressure, medium pressure, and high pressure rotary joints.
5) Classified by fluid medium temperature: divided into room temperature rotary joints, high temperature rotary joints, and low temperature rotary joints.
6) Classified by device speed: divided into low-speed, medium speed, and high-speed rotary joints.
There are various structures of rotary joints, but most of them include rotating parts, stationary parts, and sealing parts. The sealing part is the key to the rotary joint, which determines the sealing performance and service life of the joint. Common sealing methods include mechanical seals, planar seals, and gap seals. The working principle of a rotary joint is mainly to ensure that the medium does not leak during rotation through a sealing structure, while achieving stable transmission of the medium.
The material selection of rotary joints is crucial for their performance and lifespan. Common materials include carbon steel, stainless steel, ductile iron, and ceramics. Carbon steel material has good strength and strong plasticity, but poor corrosion resistance; Stainless steel material has good rust resistance and high temperature resistance, and is widely used in the transmission of corrosive and high-temperature media; Ductile iron improves the mechanical properties and toughness of cast iron; Ceramic materials have excellent wear resistance, high temperature resistance, and corrosion resistance. When selecting materials, it is necessary to comprehensively consider factors such as the properties of the medium, temperature, pressure, and the working environment of the equipment.
Rotary joints are widely used in various rotating or reciprocating equipment that requires fluid transmission, such as CNC machine tools, printing machinery, packaging machinery, construction machinery, rubber machinery, etc. In rubber machinery, rotary joints are commonly used to connect the feed and discharge ports of equipment such as rolling mills, screw extruders, mixing mixers, as well as cooling systems. In addition, rotary joints are widely used in processing and manufacturing automation industries such as metallurgy, machine tools, power generation, petroleum, plastics, rubber, etc.
When using rotary joints, the following points should be noted:
1) Correct installation: Ensure that the rotary joint is securely installed, the interface is aligned, and the fastening is reliable.
2) Regular inspection: Regularly check the sealing performance and wear of the rotary joint, and replace severely worn seals in a timely manner.
3) Medium adaptability: Select the appropriate type and material of rotary joint based on the properties of the medium.
4) Maintain cleanliness: Keep the rotary joint clean and dry to prevent impurities and moisture from entering the interior of the joint.
5) Reasonable selection: Choose the appropriate rotary joint model and specifications based on the working parameters of the equipment, such as speed, pressure, temperature, etc.
In summary, rotary joints are important pipeline connection devices with wide applications in industrial production. Proper selection and use of rotary joints can ensure the normal operation of equipment and improve production efficiency.