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The coupling bolt connection and the distance between the two coupling halves

Update:10-10-2020
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The coupling is composed of two half shaft joints, a mi […]

The coupling is composed of two half shaft joints, a middle extension joint, a set of diaphragms and a bolt set. When installing, first install a diaphragm and the middle extension section, connect it with screws according to the correct method, and measure the gap of another group of diaphragms with a caliper. Generally, the gap is the actual thickness of the diaphragm plus 0.5mm. If the gap is too small, it will be difficult to install and remove the diaphragm, and produce abnormal noise during operation. If the gap is too large, the diaphragm will be deformed, because after the coupling bolts are installed, the two halves of the coupling and the middle section are used The diaphragm connection is a flexible connection and is completely connected by the diaphragm.

One half coupling flange is connected to the diaphragm with a bolt, and the other three bolts are connected to the middle extension section, and the torque is transmitted by the diaphragm. If the distance between the two half couplings is too large, it is completely dependent on the diaphragm. In order to fully connect the two flanges, the greater the distance between the two coupling halves, the greater the axial stretch of the membrane, the greater the compensation of the membrane, and the greater the deformation of the membrane. The greater the value, the greater the compensation of the diaphragm, and the greater the deformation of the diaphragm, which results in distortion of the diaphragm. If the spacing is appropriate, the diaphragm does not have an axial stretch, and the diaphragm is in a free state when it is not running, and there is no deformation. Therefore, the gap of the coupling diaphragm group is too large, which is one of the reasons for the distortion of the diaphragm.

There are many ways to detect the distance between the two halves of the coupling. Introduce a simple and accurate method, which is to use a caliper to measure directly, and measure the readings of 3 to 4 points on the inner sides of the flanges along the two halves The average value, and then add 0.5mm to the sum of the measured length of the lengthened section and the two sets of diaphragms. These two values ​​should be equal, indicating that the gap meets the grid standard. Coupling bolts are often used, and can be divided into backrest pins, horny holes, ordinary bolts, high-strength bolts, hexagonal bolts, galvanized bolts, etc. The bolt is the main part of the coupling, and it is also a vulnerable part. It is very likely that the half coupling is not broken, and the bolt has a problem first, which causes the customer to stop and lose. The bolts selected for different types of couplings are selected according to the size, length, strength, use environment, etc., or the appropriate torque is calculated after calculation, and the chemical composition, impact toughness and hardness of the main working environment in the transportation process are considered to meet the standards.

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