Flanged Coupling

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Flanged coupling is a rigid coupling widely used in mechanical transmission systems, which occupies an important position in the industrial field due to its simple structure, high torque transmission, and high alignment accuracy. This type of coupling tightly connects two flanged half couplings with bolts, achieving a rigid connection between shafts and ensuring efficient and reliable power transmission.

The structural composition of flanged coupling:

• Half coupling: usually used in pairs, each half coupling includes a flange and a shaft sleeve, made of high-quality carbon steel or alloy steel cast or forged as a whole

• Connecting bolts: made of high-strength alloy steel, divided into two types: ordinary bolts and hinged hole bolts

• Anti loosening components: including spring washers, locking nuts, etc., to prevent bolts from loosening during operation

• Alignment positioning components: Some designs include alignment rings or positioning stops to ensure precise alignment

The selection of manufacturing materials for flanged couplings directly affects their performance and service life. Common materials include:

• Carbon steel (such as 45 steel): economical and practical, suitable for general working conditions

• Alloy steel (such as 40Cr): higher strength, used for heavy-duty applications

• Stainless steel: used in corrosive environments

• Special alloy: used for extreme working conditions such as high temperature and low temperature

The flange coupling achieves power transmission through a rigid connection. When the driving shaft rotates, the rigid structure connected by bolts directly transmits torque to the driven shaft, with almost no elastic deformation or angle compensation.

This working principle determines that it has the following mechanical properties:

• Torque transmission characteristics: completely relying on the rigid connection of metal components to transmit torque, without buffering and vibration reduction function

• Load distribution: Torque is transmitted through frictional forces generated by connecting bolts, and hinged bolt holes can also withstand some shear forces

• Alignment requirements: The two axes must be strictly aligned, with a general radial deviation of no more than 0.05mm and an angular deviation of no more than 0.05 °/m

• Axial constraint: completely limits axial displacement, suitable for situations where axial compensation is not required

Main types and technical characteristics

• Ordinary flanged coupling (GY type)
  The most common standard flange coupling uses ordinary bolt connections and relies on the frictional force generated by bolt pre tightening to transmit torque. The characteristics are simple structure and low cost, but strict requirements for bolt pre tightening force, requiring regular inspection of the tightening status.

• Articulated hole flange coupling (GYS type)
  The bolts and holes adopt a transitional fit, and the bolts can withstand both shear forces and transmit torque. This design improves transmission capacity and reduces the risk of bolt loosening, but requires higher machining accuracy and is commonly used in heavy-duty situations.

• Equipped with a flange coupling for the middle ring
  Adding precision machined centering rings between the two halves of the coupling significantly improves centering accuracy and is suitable for high-speed rotating machinery such as steam turbines and centrifugal compressors.

Selection considerations:

• Torque parameters: Select appropriate specifications based on the required torque of the working machinery, generally taking a safety factor of 1.5-2 times the rated torque

• Speed limit: The maximum allowable speed of the coupling should not be exceeded, and models with high balance accuracy should be selected for high-speed applications

• Shaft diameter matching: Ensure that the coupling aperture is consistent with the shaft diameter, which can be achieved through transition fit or light press fit

• Environmental conditions: Consider the effects of temperature, humidity, corrosive media, etc., select suitable materials and protective measures

Installation steps and precautions:

• Pre installation check:
  Clean all parts and mating surfaces
  Check if the threads of bolts and nuts are intact
  Measure whether the dimensions of each part meet the requirements

• Centering adjustment:
  Use a dial gauge to measure radial and axial deviations
  Adjust the motor or equipment base to keep the deviation within the allowable range
  Accuracy requirements for alignment: general equipment ≤ 0.05mm, precision equipment ≤ 0.02mm

• Bolt tightening:
  Tighten step by step using a cross sequence
  Use a torque wrench to ensure even pre tightening of each bolt
  The final tightening torque should meet the design value

• Operation check:
  No load test run to check for vibration and noise
  Monitor the operating temperature, which should normally be below 70 ℃
  Regularly check the tightening status of bolts

Daily maintenance content:

• Regular inspection:
  Check the tightening status of bolts every month
  Check the alignment of the coupling every quarter
  Check the wear and deformation of the coupling every year

• Lubrication management:
  Non lubricated couplings should be kept clean and dry
  Lubricating couplings are regularly lubricated with designated grease

• Status monitoring:
  Vibration monitoring: Regularly check with a vibration analyzer, and a frequency below 2.8mm/s is considered normal
  Temperature monitoring: Infrared thermometer inspection, abnormal temperature rise may indicate poor alignment or overload

Application fields:

• Heavy machinery equipment: metallurgical rolling mills, mining machinery, heavy-duty presses, etc., utilizing their high torque transmission capability

• Energy equipment: steam turbine generator sets, water turbines, compressors, etc., using high-precision centering type couplings

• Ship power: flange couplings for ships that require special anti-corrosion treatment for the connection between the main engine and the shaft system

• Chemical equipment: pumps, fans, etc., using stainless steel or special coating anti-corrosion couplings

As a fundamental component in the field of mechanical transmission, flange couplings are developing towards higher precision, intelligence, and longer lifespan with the advancement of industry and intelligent manufacturing. The correct selection and use of flanged couplings are of great significance for ensuring the reliable operation of the entire transmission system and improving equipment efficiency.

With excellent quality, we have been continuously providing many coupling products of various categories and uses complying with multiple standards and a full range of services, from the product selection to final installation and operation, for the industry fields of ferrous metallurgy, nuclear power, gas turbine, wind power, ropeway construction, lifting transportation, general equipment, etc.

« Flanged Coupling » Post Date: 2024/4/26 , https://www.rokeecoupling.net/cases/flanged-coupling.html