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Rigid coupling and flexible coupling and design of coupling

Author: Ever-Power Coupling Release Date: 2016-02-01 08:52 Click:
On-site handling method for rigid coupling that exceeds the standard: If the rigid coupling is too high, when the bolts are tightened, it will cause the shaft journal on the other side to increase and vibrate during operation.

  On-site handling method for rigid coupling that exceeds the standard: If the rigid coupling is too high, when the bolts are tightened, it will cause the shaft journal on the other side to increase and vibrate during operation.The methods for on-site treatment of skew are: use standard flat plate to repair or use uneven heating to cause the parts to expand to correct the skew.The specific method is to turn the coupling plane to the upper part from the negative value, and then use the roasting bar to heat along the arc at the large positive value, the other end of the coupling, that is, the circular surface near the root of the coupling .The end face of the coupling at the negative value is heated by a zigzag fire.Simultaneous heating.The runout of the coupling exceeds the standard. Through dynamic balancing, the mass imbalance caused by the center can be balanced; the coupling can be expanded, and its own weight or hanging weight can be used to correct the deviation. During the heating process, a dial indicator can be installed to monitor changes. condition.The coupling is used to connect the turbine rotor and generator rotor to the main oil pump lubrication system and adjustment system, and mainly transmits the rotating torque.Since the coupling rotates at a high speed with the steam turbine rotor, it is subject to great centrifugal force.One end of the original spring-type flexible coupling is fixed by two flange bolts, clamped between the turbine rotor flange and the coupling flange, or between the oil pump main shaft, and has an axial displacement.In operation, due to the deviation between the center of the steam turbine rotor and the center of the coupling, and the slightly uneven expansion of the main shaft or other reasons, a large shear force of the spring sheet may be caused. Due to the twisting stress of the spring sheet, So it is very easy to break.After the spring sheet is broken, the axial gap is uneven, and the left and right openings have a large deviation. After reaching the design theory level, the flange on the coupling side will be rubbed under the shingle cover for a short time. A longer time will cause the coupling bolts. Fracture, and then twist off.After changing to the gear sleeve type, the main advantages are as follows: large center deviation is allowed when the rotor expands; the large rotating torque of the steam turbine generator can be smoothly transmitted; the shaft displacement can be well absorbed when the main shaft expands; each tooth The coupling is uniform, and the force between the teeth is more uniform, which reduces the vibration in the transmission.
  Rigid coupling is matched with flexible coupling: Rigid coupling has good startability and compensation performance. Matching with flexible coupling can improve mechanical transmission performance.It is suitable for mechanical equipment that starts with load or frequently starts without speed adjustment, such as centrifugal pumps, blowers, air compressors, belt conveyors, scraper conveyors, mixers, ball mills, etc. The SF type is a flange-clamped three-part coupling. The clamped part is equivalent to the JQ-type coupling, and the flange part is the same as the DT-type coupling.In the structural design, it not only retains the advantages of easy centering of the flange coupling, but also has the advantages of convenient assembly and disassembly of the clamp housing coupling.There is a gap in the axial direction to ensure that the static ring seat of the mechanical seal is removed. When the seal ring is installed, only the stirring shaft must be lowered by 68mm, which is suitable for occasions where the seal ring is frequently replaced.
  The design of the coupling takes into account the axial displacement between the two to be connected, and its value should be greater than 6mm.When the coupling is installed, a compensation amount should be reserved in the direction of thermal expansion.The structure of the gear coupling without spacer sleeve should allow the gear sleeve to make an appropriate amount of axial movement, so that the inner and outer teeth can be separated from the cohesion, so that the working condition of the gear teeth and the equipment need not be disassembled during maintenance.
  The structure of the coupling should ensure that all parts are aligned.The mating inner and outer teeth should be centered by the tooth top.In order to reduce potential imbalances, tooth circumferential backlash.For the vertical joint surface of coupling parts, the tolerance level of the end face of the rotation center is level 6, and the tolerance level of the other end faces is level 7; the tolerance level of the radial runout of the mating surface and the guide surface of the center of rotation is level 6 Grade; the radial runout tolerance grade of other cylindrical surfaces is grade 7; the coaxiality tolerance grade of the mating surface and the guiding surface of the rotation center is grade 5.The coupling seller shall state the required bolt tightening torque value. The vertical flange of the hub and the spacer shall adopt bolts for reaming holes and self-locking nuts, and the hole size tolerance zone is H8.The bolts should be limited to the mass range to avoid adverse effects on the balance of the coupling during interchange.When the buyer requires electrical insulation of the coupling, the coupling with spacer should be selected, and there should be electrical insulation on the flange joint surface and the bolt position.

 

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