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    Installation matters and principles of use of diaphragm coupling

    Release Date: 2021-07-07 Publisher: admin

    Precautions for installation of diaphragm coupling:

    Because hot-loading is performed under high temperature and stress, it is necessary to have sufficient estimates of possible problems and try to avoid them in advance. If it happens, you should also panic on the spot and take timely measures to deal with it.

    Make each operator understand the operation steps, achieve a clear division of labor, and stick to their posts in the event of any accident.Secondly, it is required to calibrate the axis of the half coupling to be horizontal, and to align the position of the half coupling hole and shaft end, keyway and key.When adjusting the position of the cushion block, you must be careful, serious, and correct. You must directly hit the half coupling to avoid damage to its surface and cause dynamic balance.The matching hole of the half coupling, the motor or the compressor shaft should be clean.

    The purpose of the correct installation of the diaphragm coupling is to strictly control the installation accuracy, reduce the angular deviation, radial deviation and axial compression or tension between the two halves of the coupling, and strictly control the dynamic balance accuracy of the coupling. , Reduce the vibration, thereby reduce the alternating cyclic compound stress of the bolt group, and control the pre-tightening force of the installation bolt within the specified range.

    The small shaft alignment will cause the open screw compressor unit to generate large centrifugal force and inertial force when rotating, causing vibration and noise, causing alternating loads at the shaft end, and aggravating the wear of the bearing. In severe cases, it will cause the shaft end to break and affect the unit. Service life.Generally speaking, the higher the speed, the higher the requirements for shaft alignment, and the relationship between speed and shaft alignment.

    Processing and assembly errors, small uniform thermal expansion of various parts, shaft deflection, small uniform wear of bearings, compressor and motor displacement, mounting frame deformation, deformation caused by lifting and transportation, and small uniform sinking of the foundation, etc. The shafts of the compressor end coupling and the motor end coupling are slightly aligned.

    Principles that need to be followed during the use of diaphragm couplings:

    XNUMX. When using a standard torque meter, no matter what method is used to install it, the axial force and bending moment that the coupling has to bear, try to avoid excessive force on the meter, which will directly cause the meter to be damaged and unusable.

    0.2. In general, when the sensor is installed, the selected coupling is rigid connection, with large vibration, small concentricity and 0.05mm larger than XNUMXmm, it is recommended to use elastic connection.Rigid connection can be used outside this range.

    XNUMX. When the torque sensor is in use, it should be installed between the power source and load of the two sets of couplings, and the power load and load equipment should be fixed to avoid vibration, otherwise the instrument will not work normally.

    The diaphragm, as the key elastic element of the diaphragm coupling, bears the main load during operation.When the diaphragm coupling rotates, its angular deviation will produce alternating stress, which alternates once per rotation.The dynamic stress of the diaphragm will cause the fatigue damage of the diaphragm and the bolt, so the accurate calculation of the dynamic and static composite stress is the key to predicting the life of the diaphragm coupling and the work of the diaphragm coupling.

    The existing related researches are mostly limited to the analysis of the stress distribution of the diaphragm when it is subjected to a certain load, and the dynamic and static composite stress when the diaphragm is actually subjected to a complex load is rarely involved.

    The membrane segment between two adjacent bolt holes can be equivalent to a cantilever beam, and the material mechanics method is used to deduce that the connecting rod diaphragm coupling can bear torque, centrifugal load, axial offset, and angular deviation. The calculation formula for the internal stress of the diaphragm is shifted, and a method for calculating the torsional stiffness of the diaphragm is proposed. It is a typical method to analyze the stress and stiffness of the diaphragm by using empirical formulas. However, its major disadvantage is that the area around the bolt hole cannot be considered The influence of the stress concentration effect causes a large gap between the calculated stress and the actual stress.

    The forms of misalignment that the diaphragm coupling can compensate include the following three basic types: angular (the center lines of the two shafts intersect at the midpoint between the ends of the two shafts at an angle), transverse (the center lines of the two shafts are offset in parallel) and Axial (the axial gap between the two shafts is too large).The actual offset that occurs during the operation of the rotating shaft system is often a combination of any of the above two types of misalignment or three types of misalignment at the same time, so the load and deformation of the diaphragm coupling during actual work are more complicated.