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Selection of Couplings
Couplings play a significant role in the use of slurry pumps, and the selection of couplings is also important when choosing slurry pumps. The type of coupling should be chosen based on the following comprehensive factors:
Types of prime movers and working load categories: Different types of prime movers (such as electric motors, diesel engines, etc.) output different power characteristics, and working load categories (such as stability, impact, vibration, etc.) also put forward different requirements for the performance of the coupling. For example, in working environments with impact loads, it is necessary to choose couplings with buffering and vibration reduction functions.
Transmission accuracy: If high transmission accuracy is required, such as in some precision equipment, it is necessary to choose a coupling that can ensure accurate transmission of two axes to reduce transmission errors.
Two axis offset conditions: including axial offset, radial offset, and angular offset. Different couplings have different compensation capabilities for two axis offset, and it is necessary to choose the appropriate coupling based on the actual two axis offset situation. For example, when there is a significant radial offset between the two shafts, a coupling with greater radial compensation capability can be selected.
Working speed: The allowable speed of the coupling is an important parameter, and it is necessary to select a coupling that can adapt to the working speed of the slurry pump to ensure that the coupling will not malfunction due to excessive speed during operation.
Humidity, temperature, and working environment: If the working environment has high humidity, temperature, or corrosive media, it is necessary to choose couplings with corresponding protective properties, such as couplings made of corrosion-resistant materials, to ensure their normal operation in harsh environments.
Installation of couplings
Preparation before installation
Check if the model and specifications of the coupling match the slurry pump and prime mover. The specifications of the coupling pins, nuts, washers, rubber rings, etc. must be consistent to avoid affecting the dynamic balance of the coupling.
Check the fit between the coupling and the shaft. Generally, a transitional fit is used for the fit between the slurry pump coupling and the shaft, which may result in a small amount of interference or clearance. For couplings with longer wheel hubs, a looser transition fit can be used. Due to the longer shaft hole, the surface machining is rough and uneven, which will naturally result in partial interference after assembly.
Precautions during installation
When disassembling: When disassembling the slurry pump coupling, it is not allowed to directly hit it with a hammer. A copper rod must be used as a cushion, and the outer edge of the coupling should not be hit as it is prone to damage. The hub of the coupling should be hit instead. The best way is to use a clamp for disassembly. For small and medium-sized pumps, due to their small interference fit, they are easy to remove. For larger water pumps, there is a significant interference fit between the coupling and the shaft, so the coupling must be heated during disassembly.
During assembly:
Attention should be paid to the key number, which means that for couplings with two or more key slots, when using the silver rod hammer method, attention must be paid to the tapping area. If the end face of the shaft hole is struck, it is easy to cause the metal fibers to expand outward, causing the shaft hole to shrink and the shaft to not fit in; If the outer edge of the wheel is struck, it is easy to damage the flatness of the end face, making it difficult to align with a feeler gauge in the future and affecting the accuracy of the measurement.
Couplings with large interference fit require heating before installation.
Inspection after installation
After installation, it is necessary to strictly ensure the concentricity of the two shafts, otherwise the connected shafts will generate additional resistance and increase mechanical vibration during operation; In severe cases, it can also cause deformation of the shaft, resulting in premature damage to the shaft and bearings. At the same time, it is necessary to ensure that the connectors are reliably connected and there is no automatic detachment phenomenon.
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(Editor in charge: Slurry Pump https://www.fuyangpumps.com/)
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