Characteristics of the drive belt

　　Drive BeltNowadays, the scope of application in machinery is relatively wide. Compared with our traditional gear transmission and turbine strength, the structure of the transmission belt is relatively simple, and the installation and maintenance process is more convenient, and its manufacturing cost is relatively low. The transmission belt itself is flexible and can alleviate the impact force and vibration generated in the transmission process, so it runs quite smoothly during use, and the noise is relatively small, can be suitable for some larger center distance transmission.

However, from another aspect, the expansion size of the transmission belt sleeve is relatively large, so its tightening degree is relatively poor and the occupied area is relatively large. The elastic sliding of the transmission belt on the pulley will change with the change of the load, so the transmission ratio is not accurate, but if there is an overload, there will be slippage. Therefore, it can prevent other transmission parts from being damaged, but it is usually not used as an overload protection device.

The transmission belt must be tensioned so that the shaft and the bearing can receive greater force between the belt and the pulley. If they interact with each other, they will rub against the sound heat and the starting point. Therefore, they cannot be used to store the belt in some places with dangerous substances. Their efficiency and durability are relatively low. Compared with flat belt transmission and V-belt, their rotation ratio is relatively large, but the center distance is relatively small, its transmission profile size is relatively compact, and sliding and Zhang Jin force is relatively small.

Because the drive belt can rely on friction to work, so it can alleviate the impact of the load, in the process of operation is very stable, will not produce too much noise, while its installation accuracy and manufacturing will not be as temporomandibular rotation as the requirements of the more stringent. At the same time, in the process of its work, it is similar to the friction wheel drive. If it is overloaded, it will cause the belt to slip, so it can prevent other parts from being damaged. At the same time, it can increase the length of the transmission belt within a reasonable range. It is used to adapt to some working conditions with relatively large center distance, and the distance can even reach 15 meters.

However, operating on frictionDrive BeltLike the friction wheel transmission, it also has the following disadvantages: elastic sliding and slipping, which reduces efficiency and cannot maintain an accurate transmission ratio. When transmitting the same large circumferential force, the contour size and the pressure on the shaft are greater than the meshing transmission force. Transmission belt failure handling: The main failure of the transmission belt is slipping. When the belt is too loose, it should be re-adjusted according to the tightness requirements in the manual. If the belt or pulley is slipping due to oil pollution, the oil pollution should be removed in time. If the belt is severely worn or stretched, a new belt should be replaced.

Cut three samples with a length of 250 mm from one PJ V-ribbed belt, and mark a marking line with a spacing of 100mm at the middle position of the PJ V-ribbed belt. When more than three samples cannot be taken from one PJ V-ribbed belt, samples can be cut from the same batch of PJ V-ribbed belt, but must be indicated in the report. 7.4.2 High temperature resistance test method
Place the sample at 100 ℃ ± 2 ℃ for 96 h ± 1 h and then take it out. After standing at laboratory temperature for more than 2h, bend it along a cylinder with a diameter of 20 mm at a contact angle of at least 90 °.