The positioning of the elastic diaphragm coupling is fixed with screws, and the gap between the two positioning screws is 90 ° to lock the fixed shaft. Traditional fixation methods may cause damage to the shaft center or difficulty in disassembly due to the contact between the front end of the screw and the shaft center. The elastic diaphragm coupling is fixed by clamping screws, and the force of tightening the inner hexagon bolt is used to shorten the narrow gap and tightly clamp the shaft center. This method is convenient for fixing and disassembling, and does not cause damage to the axis, making it a commonly used fixing method. Elastic diaphragm coupling keyway type fixation is suitable for high torque transmission. To avoid axial sliding, it is generally used in combination with positioning screws and clamping screws for fixation.
The D-shaped hole of the elastic diaphragm coupling is fixed. In general, if the motor shaft is in a D-shaped shape and the positioning screw cannot be fixed, the coupling hole can be processed into a D-shaped hole corresponding to the size of the motor shaft. By cooperating with the positioning screw for fixation, there is no need to worry about slipping. The expansion sleeve is fixed by tightening the four positioning screws on the end face of the Ling Si coupling to press the cover. It is suitable for the joint fixation of some stepper and servo motors with high torque, such as the expansion sleeve diaphragm coupling, expansion sleeve plum blossom coupling, expansion sleeve corrugated pipe coupling, expansion sleeve elastic diaphragm coupling, etc. Fix the outer support foot on one side of the lifting accessory coupling motor and move the inner support foot until the motor and pump base have a zero bias line. To ensure that the motor does not move freely, after fixing one side of the motor’s support foot, the other side should be supported with a top screw.
The diaphragm coupling adopts the form of tooth top positioning. Tooth tip clearance selection. Under static conditions, the floating outer gear sleeve has an eccentricity relative to the rotation center of the shaft. When rotating at high speed, without transmitting torque, the floating outer gear sleeve will operate eccentrically under the action of centrifugal force, and generate eccentric load. To achieve stable operation, sufficient torque must be transmitted. Because the tooth top positioning usually has a small amount of top clearance, the floating outer gear shaft sleeve can have a small eccentricity, and the generated centrifugal force is also small, resulting in a small transmission torque required for stable operation. In order to ensure the stable operation of the toothed coupling, the small torque required for high-speed rotation is necessary. To accurately determine the eccentricity caused by the tooth tip clearance, the difference in radial expansion caused by the high-speed rotation of the ring and outer gear sleeve must also be considered.
Elastic coupling is a mechanical component that connects the driving part and the driven mechanism to rotate together and transmit energy and motion. The diaphragm type elastic coupling has the advantages of no lubrication, long service life, and large compensation capacity. It transmits torque through flexible steel sheets and has angular, axial, and radial displacement compensation capabilities as well as shock absorption effects. Couplings can be divided into rigid couplings and elastic couplings. Rigid couplings are usually used in situations of low speed and heavy load, and their main function is to transmit large amounts of power; Elastic couplings are mainly used in high-speed rotor systems, which use elastic components or specific structures to adjust and compensate for misalignment caused by manufacturing, installation, and temperature changes. At the same time, elastic couplings generally have the function of vibration isolation.
Elastic couplings have become a hot research topic in the domestic engineering community due to their excellent performance. The diaphragm is easy to assemble and disassemble, without the need for lubrication, and can be ideal for various working conditions. Diaphragm elastic coupling is favored by construction machinery and rolling machinery due to its superior performance. Although it is durable, it will also fail or even be scrapped due to various reasons, so it is of great significance to study its Failure cause. Diaphragm damage is the main form of coupling failure. The Fault tree analysis method is a common and practical system reliability analysis method in engineering, which is simple, intuitive and flexible, and is suitable for failure analysis of diaphragm elastic coupling.
The torque transmitted by the diaphragm type elastic coupling under normal working conditions is much greater than the small force required for R fixed operation. After transmitting the torque, it can achieve self centering and stable operation. The floating connecting shaft is designed as a hollow shaft to reduce weight and improve the stability of the floating component. The gear teeth are positioned at the top of the teeth to reduce the top clearance. The accuracy of dynamic balance requires installation on the output shaft of the accessory gearbox and the rotating shaft of the gas turbine for dynamic balance. Similar toothed couplings abroad use grease lubrication, and we have switched to oil spray lubrication to improve lubrication conditions. Fix the inner support feet of the coupling and move the outer support feet to make the two grounding wires have zero bias. After repeating the above two methods several times, the coupling can be in a centered state. The alignment of lifting accessory couplings is an important task in the equipment maintenance process. Although the principle of alignment is simple, it is highly practical. The commonly used alignment methods on small pumps include single meter method, double meter method, and three meter method. No matter which method, there is a common characteristic; Alignment in the horizontal plane is simpler to make mistakes than in the vertical plane, with strong repeatability, time-consuming, and cumbersome accounting.
The elastic diaphragm coupling transfers torque between the elastic body and the claw body, with radial, axial, and angular compensation, and features shock absorption, buffering, no need for smoothness, and simple organization. If the conditions allow for disassembly, the basic type is sufficient. When disassembling, the half coupling needs to be moved axially. If the conditions do not allow for movement, a double flange type can be selected. Some materials for elastomers usually use polyurethane or cast nylon, and different materials are selected based on different working conditions. When working smoothly in light industries, textiles, fans, water pumps, etc., and the load changes are not significant, polyurethane can be selected. The price difference between the two materials is significant.
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