Improved design of elastic pin coupling pin device

　　The elastic pin coupling consists of two parts, which are respectively connected with the driving shaft and the transmission shaft.An elastic pin coupling is used to connect two different mechanisms (active mechanism and driving mechanism), so that they rotate together to transmit torque.In high-speed and heavy-load power transmission, some have the function of damping vibration and improving dynamic performance.Most of the power machinery is connected to the working machine through couplings.

　　Aiming at the problems in the original standard design, the author improved the anti-pin structure design of the LX elastic pin coupling.Described as follows:

　　1. The flange hole of the left half of the coupling is designed as a through hole with different diameters, so the original design of the left baffle is omitted.When replacing the pin, the old pin can be ejected from left to right through the small hole.

　　2. The "fancy" block structure with internal processing coupled to the right half.That is, a groove is machined inside the flange.The groove is located in the center of the flange hole diameter, about 4mm deep and 8mm wide.

　　When replacing a new shaft pin, use 12≤14# steel wire to surround a circle around the tightened groove, which acts as a baffle pin instead of the original baffle.

　　In the field, the existing elastic pin coupling can also be modified.In other words, a workpiece with a similar structure to the inner flange "pattern" baffle can be welded to the original coupling, and there is no further discussion here.

　　When choosing a standard coupling or designing a special coupling, you must first find out the torque that the coupling actually needs to transmit.For standard couplings, the allowable torque value for each model has been determined.Therefore, when selecting the model, the torque actually required to be transmitted through the coupling is less than the allowable torque [t] of the selected coupling...The torque actually required to be transmitted through the coupling is usually used to calculate the torque t0.This means that it is equal to the theoretical torque of the coupling multiplied by the working condition coefficient k. Therefore, the above condition can be expressed as: t0=kt.Most of the commonly used couplings have been standardized, and they are generally directly selected from the standards. The selection steps are: first select the model and model, and then perform the necessary strength check.

　　According to the working characteristics and requirements of the machine tool, combined with the performance of various couplings, and referring to the working experience of similar machine tools, the coupling type is selected.

　　Both shafts have high neutral requirements.When the shaft stiffness is large, sleeve coupling or flange coupling can be used.If the alignment of the two shafts is poor or the shaft stiffness is small, the shaft offset should be selected.Flexible coupling with compensation capability; when the transmitted torque is large, flange coupling or gear coupling should be used; when the shaft speed is high, elastic coupling should be used when vibrating; when the two shafts intersect at a certain angle , Cross-shaft universal coupling should be used.

　　It should be pointed out that choosing a larger working condition coefficient and using a larger size coupling cannot be considered to obtain higher transmission performance and working reliability.In fact, when the size and weight of the coupling increase, the two shafts of the coupling and the load it bears will also increase.If the relative displacement of the two shafts remains the same, increasing the size of the coupling will inevitably lead to an increase in the additional dynamic load.Therefore, this is not necessarily a good result.Especially when the transmission shaft system is under variable load, the weight of the coupling directly affects the dynamic characteristics of the coupling.For shafting bearing accidental impact load, a smaller size safety coupling should be used.

　　The working condition coefficient is the influence coefficient of the load change of the drive shaft system and the working environment on the actual requirement of the coupling transmission torque.Generally speaking, its value is related to the type of power machine and working machine, working conditions, moment of inertia of the drive shaft, etc., and is also affected by the structure of the coupling itself.Therefore, use the same coupling in different transmissions, or use different couplers in the same transmission.The working condition coefficients are not necessarily the same, the data recommended by the general data are general estimates.For important drive shafts, the coefficient is obtained by calculating the dynamic characteristics of the drive shaft or by measuring the torque during operation.For general drive shaft systems, this coefficient can refer to operating experience or test data with similar drive conditions.Since these data are obtained under certain conditions based on actual experience, the sources are different and the data are not completely consistent.

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