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Important parameters determining the load-bearing capacity of chain drives
1. In order to ensure the normal operation of the transmission energy of the conveyor chain, attention should be paid to its reasonable arrangement. The principles of arrangement are briefly explained as follows:
(1) The rotation plane of the two sprockets should be in the same vertical plane, otherwise it is easy for the chains to fall off and cause abnormal wear.
(2) The center line between the two sprockets should be horizontal or at an angle below the horizontal plane, and vertical transmission should be avoided as much as possible to avoid poor meshing or disengagement with the sprocket below.
2. In the tension chain transmission of chain drive, if the loose edge sag is too large, it will cause poor meshing and chain vibration. Therefore, the purpose of tension in chain drive is different from that of belt drive. The tension force does not determine the working ability of the chain, but only the size of the sag. There are many methods of tensioning, the most common of which is to move the sprocket to increase the center moment of the two wheels. But if the center distance cannot be adjusted, a tensioning wheel can also be used for tensioning, as shown in Figure 1a and b. The tensioning wheel should be installed on the loose edge near the driving sprocket. Whether it is a toothed or non toothed tensioner, the diameter of its indexing circle should be similar to that of the small sprocket. In addition, pressure plates or pallets can be used for tensioning. Especially for chain drives with large center to center distances, it is more reasonable to control the verticality with pallets.
3. Lubrication of chain drive
Lubrication of chain drive is crucial. Appropriate lubrication can significantly reduce the wear of chain hinges and prolong their service life. The lubrication method for chain transmission can be selected according to Figure 2. There are usually four lubrication methods: 1) manually supplying oil regularly with an oil pot or brush; II - Drip oil lubrication, use an oil cup to drip oil into the gap between the inner and outer chain plates of the loose edge through the oil pipe; III - Oil bath lubrication or splash lubrication, using a sealed transmission box. The former involves partially immersing the chain and sprocket in oil, while the latter uses a larger diameter oil slinger to splash oil; IV - Oil pump pressure injection lubrication, using the oil pump to continuously supply oil to the chain through the oil pipe, circulating oil can play a role in lubrication and cooling. The viscosity of the lubricating oil used in chain drive is about 20-40mm2/s at operating temperature. Only in places where the speed is slow and oil supply is not possible, can grease be used as a substitute.
1. Chain transmission belongs to meshing transmission, which can obtain accurate average transmission ratio and achieve transmission with larger center distance. Due to the polygonal distribution of rigid chain links on the chain, it causes periodic changes in instantaneous transmission ratio and impacts during meshing, resulting in poor transmission stability. 2. Uneven movement of chain drive and impact caused by rigid chain links meshing between sprocket teeth will inevitably result in dynamic loads. When the chain meshes between the sprocket teeth, continuous impact, vibration, and noise are formed, which is called the 'polygonal effect'. The larger the pitch of the chain, the higher the sprocket speed, and the more severe the 'polygonal effect'. During design, it is necessary to limit the chain speed. In addition, selecting chains with small pitch is also beneficial for reducing the unevenness and dynamic load of chain transmission. 3. The design calculation of chain drive is usually based on the transmitted power P, working conditions, sprocket speed n1, n2, etc., selecting the number of sprocket teeth z1, z2, determining the cutting distance, number of columns, transmission center distance, sprocket structure, material, lubrication method, etc. of the chain.
(1) The rotation plane of the two sprockets should be in the same vertical plane, otherwise it is easy for the chains to fall off and cause abnormal wear.
(2) The center line between the two sprockets should be horizontal or at an angle below the horizontal plane, and vertical transmission should be avoided as much as possible to avoid poor meshing or disengagement with the sprocket below.
2. In the tension chain transmission of chain drive, if the loose edge sag is too large, it will cause poor meshing and chain vibration. Therefore, the purpose of tension in chain drive is different from that of belt drive. The tension force does not determine the working ability of the chain, but only the size of the sag. There are many methods of tensioning, the most common of which is to move the sprocket to increase the center moment of the two wheels. But if the center distance cannot be adjusted, a tensioning wheel can also be used for tensioning, as shown in Figure 1a and b. The tensioning wheel should be installed on the loose edge near the driving sprocket. Whether it is a toothed or non toothed tensioner, the diameter of its indexing circle should be similar to that of the small sprocket. In addition, pressure plates or pallets can be used for tensioning. Especially for chain drives with large center to center distances, it is more reasonable to control the verticality with pallets.
3. Lubrication of chain drive
Lubrication of chain drive is crucial. Appropriate lubrication can significantly reduce the wear of chain hinges and prolong their service life. The lubrication method for chain transmission can be selected according to Figure 2. There are usually four lubrication methods: 1) manually supplying oil regularly with an oil pot or brush; II - Drip oil lubrication, use an oil cup to drip oil into the gap between the inner and outer chain plates of the loose edge through the oil pipe; III - Oil bath lubrication or splash lubrication, using a sealed transmission box. The former involves partially immersing the chain and sprocket in oil, while the latter uses a larger diameter oil slinger to splash oil; IV - Oil pump pressure injection lubrication, using the oil pump to continuously supply oil to the chain through the oil pipe, circulating oil can play a role in lubrication and cooling. The viscosity of the lubricating oil used in chain drive is about 20-40mm2/s at operating temperature. Only in places where the speed is slow and oil supply is not possible, can grease be used as a substitute.
1. Chain transmission belongs to meshing transmission, which can obtain accurate average transmission ratio and achieve transmission with larger center distance. Due to the polygonal distribution of rigid chain links on the chain, it causes periodic changes in instantaneous transmission ratio and impacts during meshing, resulting in poor transmission stability. 2. Uneven movement of chain drive and impact caused by rigid chain links meshing between sprocket teeth will inevitably result in dynamic loads. When the chain meshes between the sprocket teeth, continuous impact, vibration, and noise are formed, which is called the 'polygonal effect'. The larger the pitch of the chain, the higher the sprocket speed, and the more severe the 'polygonal effect'. During design, it is necessary to limit the chain speed. In addition, selecting chains with small pitch is also beneficial for reducing the unevenness and dynamic load of chain transmission. 3. The design calculation of chain drive is usually based on the transmitted power P, working conditions, sprocket speed n1, n2, etc., selecting the number of sprocket teeth z1, z2, determining the cutting distance, number of columns, transmission center distance, sprocket structure, material, lubrication method, etc. of the chain.