Precautions and structure of diaphragm coupling processing

Matters needing attention when processing diaphragm coupling:

XNUMX. The whole machine has fewer parts, small size and light weight. The spring leaf designed as a trapezoidal cross-section and the trapezoidal tooth groove are particularly convenient and close, so that the assembly, disassembly and maintenance are simpler than ordinary couplings.

XNUMX. The transmission speed of the diaphragm coupling, its short-term overload capacity is twice the rated torque, and it runs.

XNUMX. The aluminum alloy casing protects the spring from being thrown out during operation, and the casing is filled with butter, which not only makes the lubrication good, but also makes the noise of the reed meshing be absorbed and removed by the butter damping.

XNUMX. Because the spring leaf and the tooth arc surface are in point contact, the coupling can obtain greater flexibility.It can be installed to work normally under conditions of radial, angular and axial deviations at the same time.

Summarize the connection mode of the diaphragm coupling:

XNUMX. Key connection: large transmission torque, simple structure, low cost and small space size. Disadvantage: its dynamic balance is not good when rotating at high speed.The working principle of diaphragm coupling connection is the same as that of common mechanical equipment key connection.

XNUMX. Connection mode of diaphragm coupling: Clamping connection: simple structure, low cost, and small space size.Disadvantages: When the locking force is not enough, it will often cause axial slippage between the coupling and the shaft.The clamping connection is to close the "opening" of the diaphragm coupling through the fastening screws at both ends to increase the clamping torque.

XNUMX. Expanding ring connection: The diaphragm coupling has a large transmission torque, high requirements for related processing dimensions, complex structure, and large coupling volume.

XNUMX. Loose connection: the key to loose key or ordinary flat key connection, semicircular key, guided flat key and feather key, etc., the torque is transmitted through the key, and the spare part cannot bear the axial force on the fixed shaft every week. If the axial is fixed, it will Additional fastening screws or positioning rings, positioning parts, etc. are required.

The study on the calculation of the stress and torsional stiffness of the diaphragm of the diaphragm coupling is helpful for in-depth and accurate analysis of the torsional vibration of the shafting, and provides determination for the operation of the ship's power plant.The diaphragm is the key element of the diaphragm coupling. Since the stiffness of other parts in the coupling is much greater than that of the diaphragm, the stiffness of the diaphragm can be regarded as the stiffness of the coupling.Due to the axial deviation of the coupling, the transmission of torque, and the bearing of centrifugal force, the diaphragm is in a complex state of stress during operation.

The structure of the diaphragm coupling is mainly composed of a metal diaphragm group (diaphragm), a half coupling, an intermediate section, a compression element, a bolt, a locknut, a washer, etc.Its working principle is: the torque is input from the half coupling at the active end, and the torque is transmitted to the diaphragm group through the main torsion bolts arranged at intervals along the circumference, and then the diaphragm group is transmitted to the middle section through the bolts, and is also transmitted by the diaphragm group. The diaphragm set, bolts and driven end half coupling output at the other end.The metal diaphragm is the key component of the flexible coupling. It is composed of a number of thin metal diaphragms superimposed to form a diaphragm group, through which torque and movement are transmitted.The thickness of the diaphragm is generally 0.2mm~0.6mm. The shape of the diaphragm mainly includes the ring type, the spoke type, the connecting rod type, the polygon type and the waist type.

Diaphragm coupling (also known as lamination, steel sheet coupling) is a new type of two-axis coupling device that can replace gear couplings with general development prospects. It consists of two shafts at both ends and a diaphragm group. , Intermediate shaft and connecting bolts.Among them, the diaphragm set is made up of a number of thin stainless steel coated diaphragms, which are used to transmit torque and the two shafts connected by the Yunji coupling. Due to manufacturing and installation errors, load-bearing deformation, thermal deformation, and mechanical Due to the sinking of the seat, a certain degree of axial, angular, and radial deviation between the axes will cause additional loads on the shafts, bearings and couplings, which will cause the diaphragm to connect to the working conditions of the unit. The shaft can absorb the three-way offset between the axes through the flexibility of the diaphragm. The diaphragm coupling can transmit large torque under working conditions, and has the advantages of simple structure, convenient processing, and no need for lubrication, so it is widely used In the fields of ships, petrochemicals, machinery manufacturing, etc.

Compared with the gear coupling, the diaphragm coupling has no relative sliding, no lubrication, sealing, no noise, basically no maintenance, more convenient to manufacture, and can partially replace the gear coupling.Diaphragm couplings are commonly used in shaft transmission of various mechanical devices, such as water pumps (especially high-power, chemical pumps), fans, compressors, hydraulic machinery, petroleum machinery, printing machinery, textile machinery, chemical machinery, mining Machinery, metallurgical machinery, naval high-speed power transmission systems, steam turbines, piston-type power mechanical transmission systems, tracked vehicles, and high-speed, high-power mechanical transmission systems of generator sets are commonly used in high-speed transmission shaft systems after dynamic balance.