How to solve the problem of large vibration of the snake spring coupling

Snake spring coupling is a mechanical part used to connect two shafts (driving shaft and driven shaft) in different mechanisms so that they can rotate together to transmit torque.In high-speed and heavy-load power transmission, some couplings also have the function of buffering, damping and improving the dynamic performance of the shafting.The coupling is composed of two halves, which are respectively connected with the driving shaft and the driven shaft.The general power machine is mostly connected with the working machine by means of a coupling.

Couplings belong to the category of general mechanical parts and components, and are commonly used connecting parts for shaft transmission of mechanical products.Commonly used couplings include diaphragm couplings, gear couplings, plum couplings, slider couplings, drum gear couplings, universal couplings, couplings, flexible couplings And serpentine spring coupling.
　　What are the precautions during the installation, use and maintenance of the coupling?Let's come here for everyone.
　　Coupling installation steps
　　1. Install the half-piece coupling on the shaft
　　(1) According to the size of the coupling, measure the actual (composition) elements of the shaft and the hole, and draw the line of the loading end position according to the regulations.
　　(2) Hammering method.Used for small size and clearance fit.First apply lubricating oil on the fit, place the key in the keyway, align the half-piece coupling into the shaft, and hit it with a hammer (preferably hit on the middle pad) until it is installed in the final position.
　　(3) Press assembly.Used for interference fit. When the interference is large, use the temperature difference method to fit the press assembly.The temperature difference method assembly is to heat and expand the hole (half coupling), and then install it on the shaft.You can use lubricating oil to heat in the heating box, or use steam heating, electric heating, etc., or use the cooling shaft to reduce the diameter, and then install the coupling.The coolants used for cold charging include liquid nitrogen (cooling temperature can reach -190～195℃), liquid ammonia (cooling temperature can reach -120℃), dry ice plus alcohol and acetone (cooling temperature can reach -75℃).
　　2. Coupling alignment connection
　　After the coupling is installed on the journal, the two halves of the coupling are preliminarily aligned by adjusting the shim, so that the centers of the two shafts are roughly aligned, and the end faces of the two coupling halves are initially parallel, and then the bolts are put on to prepare for coaxial Degree adjustment.
　　蛇形弹簧联轴器适用于传递转矩变化较小的工况条件，在使用中可能会遇到振动大的问题，下面给大家分享蛇形弹簧联轴器应用中振动大怎样解决？
　　1. The vibration of the bearing and all directions are dominated by power frequency, with obvious double frequency components.Whether there is an obvious bearing failure frequency, it indicates that the bearings are not faulty and are installed and lubricated well.
　　2. According to on-site measurement data, the vibration of the non-drive end (impeller side) of the fan is less than the vibration of the drive end. The vibration of the two fans is not caused by the unbalanced mass of the serpentine spring coupling of the impeller itself or the unbalanced mass of the fan rotor after installation. of.
　　3. Whether there is an obvious passing frequency of the blades, and the field test has confirmed that the fan vibration has nothing to do with the opening of the baffle, indicating that the flow part of the fan is normal.
　　The serpentine spring coupling will inevitably have problems during use. Among the possible problems, there are more vibrations, so I will explain to you how to solve this problem. The advantages of this coupling It is a small radial size, large load capacity, long shafting transmission for low-speed and heavy-duty conditions, and a dynamically balanced gear coupling can be used for high-speed transmission, such as the shafting transmission of gas turbines.
　　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.Since the angular compensation of drum gear couplings is greater than that of straight gear couplings, drum gear couplings are commonly used. Straight gear couplings are an obsolete product and should not be used as much as possible.
　　Do not untieSnake spring couplingMeasure the beating of the fan and the motor side journal under the cover, then untie the serpentine spring coupling cover to measure the alignment of the two rotors, and then remove the serpentine spring to measure the alignment of the two rotors.