Precautions for using double-headed bolts, how to maintain double-headed bolts?

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　　How to maintain and care for double-headed bolts. Double-headed bolts are also indispensable in our lives; they are generally used in larger buildings or machines. Although double-headed bolts may appear simple in design, their role is very important. A machine cannot operate without them, so it is crucial to take good care of these bolts. https://p29-tt.byteimg.com/large/pgc-image/8efb5a3ab2a546dcb6c12c8f068b4331 Double-headed bolts lack heads; they are also known as double-headed studs. A double-headed screw has threads on both ends, with no threads in the middle; the middle part is a solid shaft. Double-headed screws are often used in large equipment such as reducer frames. In practical use, external loads can cause vibrations, and temperature changes can lead to reduced friction; over time, this results in the threaded connection becoming loose and ineffective. Therefore, it is necessary to carry out proper maintenance of double-headed screws on a regular basis. 　　Double-headed bolts can develop problems due to prolonged mechanical friction; when such problems occur, it is necessary to remove the engine oil pan and carefully inspect the condition of the engine bearing shells. Check whether the gap between the bearing shells is too large, and if it is, replace them promptly. When replacing the double-headed screw, the linkage bolt also needs to be replaced. For some large-scale equipment such as nail-making machines, if it is noticed during normal operation that the engine is not running stably or if unusual noises are heard, it is necessary to stop the machine immediately for inspection, in order to avoid more serious problems. https://p9-tt.byteimg.com/large/pgc-image/67406743a1a9427eb3f72277dbcd3d21 　　Every time maintenance is carried out, it is necessary to inspect the newly replaced double-headed screws as well as other newly installed components. The inspection should focus on the head and guiding parts of the double-headed bolts; in addition, it is important to thoroughly check each part of the thread for any cracks or dents, and to also examine whether there have been any changes in the shape of the screw teeth. 　　Check whether there are any abnormalities in the pitch; if such abnormalities exist, it must not be used anymore. A torque wrench should be used when installing the rod cover. It must be tightened in accordance with the specified standards; the torque should neither be too high nor too low. Additionally, care should be taken to choose double-headed bolts from a compatible manufacturer.