The program method for the selection of the equipment coupling of the slime dryer
(XNUMX) Choose standard coupling
When choosing a coupling, the designer should first choose among the couplings that have been formulated as national standards, machinery industry standards, and national *, only when the existing standard couplings and * couplings cannot meet the design needs. Design the coupling by yourself.Our country has formulated a considerable number of different types of standard couplings that can basically meet different torque, speed and working conditions in different structural types and specifications.Some of these standard couplings are self-developed by our country and have undergone industrial experiments; some are converted according to the relevant standards of foreign industrial developed countries; some are digested and absorbed with reference to imported prototypes and developed by themselves.Some standard couplings are not only new high-performance domestically, but also advanced internationally, such as diaphragm couplings.In formulating standards, they generally go through strict procedures to ensure the quality of the standards.Standard couplings are mature and generally should be reliable. The key is to choose the right one.National* couplings, such as flexible live pin couplings, sector-shaped flexible couplings, absorb the advantages of a variety of old-fashioned flexible couplings, overcome their own shortcomings, are high-performance, new technology at home and abroad, Renewal of couplings.
(XNUMX) Choose the type and type of coupling
Understand the comprehensive functions of the coupling (especially the flexible coupling) in the transmission system, and choose the type and type of the coupling from the overall design of the transmission system.According to the prime mover category and working load category, working speed, transmission accuracy, two-axis offset conditions, temperature, humidity, working environment and other comprehensive factors to select the type of coupling.Select the structure of the coupling according to the needs of the supporting host. When the coupling is used in conjunction with the brake, it is advisable to choose a coupling with a brake wheel or a brake disc; when overload protection is required; *coupling should be selected ; When connecting with flanges, the flange type should be selected; for long-distance transmission, when the axial size of the connection is large, it is advisable to choose the middle or middle sleeve type.
(XNUMX) Calculation of coupling torque
The power of the power machine in the drive system of the slime dryer should be greater than the power required by the workpiece machine.According to the power and speed of the power machine, the theoretical torque T of the high-speed end connected to the power machine can be calculated; according to the working condition coefficient K and other related coefficients, the calculated torque Tc of the coupling can be calculated.The coupling T is inversely proportional to n, so the low-speed end T is greater than the high-speed end T.
(XNUMX) Primary selection of coupling model
According to the calculated torque Tc, an approximate nominal torque Tn can be selected from the standard series, and the selection should satisfy Tn ≥ Tc.The coupling model (specification) is preliminarily selected, and the allowable speed of the coupling [n] and the maximum radial dimension D and the axial dimension Lo can be found from the standard, which should satisfy the coupling speed n ≤ [n ].
(XNUMX) Adjust the model according to the shaft diameter
The coupling size of the coupling initially selected for the sand dryer, namely the shaft hole diameter d and the shaft hole length L, should meet the requirements of the shaft diameter of the driving and driven ends, otherwise the coupling specifications must be adjusted according to the shaft diameter d .It is a common phenomenon that the shaft diameters of the driving and driven ends are different. When the torque and speed are the same, and the shaft diameters of the driving and driven ends are different, the coupling model should be selected according to the larger shaft diameter.In the newly designed transmission system, the seven shaft hole types in accordance with GB/T 3852 should be selected, and the J 1 shaft hole type is recommended to improve versatility and interchangeability. The length of the shaft hole is in accordance with the coupling product standard Provisions.
(XNUMX) Choose the connection type
The choice of coupling connection type of sand dryer depends on the connection type of the main and driven ends and the shaft. Generally, key connection is adopted. It is a unified key connection type and code. Seven types are specified in GB/T 3852. Keyway type, four types of keyless connection, the most used is the A-type key (flat key single keyway).
(XNUMX) Variety, type and specification of fixed coupling (model)
According to the comprehensive factors such as power machine and coupling load category, speed, working environment, etc., select the type of coupling, and select the coupling type according to factors such as the matching of the coupling and the connection situation; according to the nominal torque and shaft hole diameter Check the length of the shaft hole, and determine the coupling model after *.Generally, there are different degrees of relative deviation between the two axes in shafting transmission, and flexible couplings should be selected; when the working load in the shafting transmission produces impacts and vibrations, flexible couplings should be selected to reduce vibration and buffer. For effect and economic considerations, flexible couplings with non-metallic elastic elements should be used.
