According to the size of the drawing, the clearance between the hole and the hub on the web is 0106mm, and the actual fit clearance is 13mm. This fully shows that the hole on the web is large and the roller is not concentric with the shaft. During operation, the hub and the web are relatively moved in the circumferential direction, and the bolts connecting the web and the hub are subjected to a large shearing force for a long time. First, the bolt is loosened and retracted. When retracting to a certain extent, the individual bolts are first Shearing occurred, and finally, after all the bolts were cut, the string shaft occurred and the drum was damaged, so that the belt machine was completely stopped.
Treatment Method The first treatment method b. When repairing the roller, firstly align the roller shaft on the lathe, make the roller shaft concentric, and try to ensure the matching clearance between the plate hole and the hub required by the drawing. Then take the following measures to prevent loose bolts: two positioning pins are assembled in the direction of 120b of the web and the hub, the first function is to ensure the positioning during assembly, and the other is to limit the relative movement of the web and the hub during operation; The plate is welded with three positioning keys in the direction of 120b, and three keyways are milled at corresponding positions on the hub. When assembling, the keys on the web board are matched with the key grooves on the hub to ensure that the matching clearance does not change, so that the hub and the web are made. No relative motion is generated; change the original coupling bolt from M24 to M30 to increase the bolt strength.
The second method of the transmission assembly drawing is to align the gap between the roller web and the hub on the lathe, and weld the hub and the web into one body to avoid relative movement between the hub and the web. In order to prevent the drum from being scrapped at one time, the drum shaft can be pressed out and easily assembled again, and the drum shaft can be modified: since the hub is welded to the web, the hub cannot be re-synchronized in the axial direction, so the roller shaft is The axle shoulders are all gone, so that the roller shaft is pressed out and loaded; o because the roller shaft and the hub are connected by a key, after the wheel hub is welded, the assembly is difficult. Therefore, one end of the wheel hub is welded to the assembly first, and after the shaft is installed, the other end of the wheel hub is welded.
The above two treatment methods have many processing steps, and the latter is difficult to assemble, and the keys and the key grooves are not easily aligned.
After the economic benefit analysis, the drums were installed in the 18 centralized transportation lanes of the Mi Village Mine and the 18041 transportation lanes. The effect was good and no problems occurred. After the drum is improved, one drive roller can be used for at least 1a or longer, 1a can save 2 rollers, and each roller can save 1.14 million yuan, which saves 2.14 million yuan. This does not include the loss caused by the replacement of the drum and the replacement. Working hours and material costs of the drum. A total of 12 belt conveyors were used in the whole mine, and only one drum can be rebuilt each year to save about 28.18 million yuan.
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â…¤. Technical Datas
Polyethylene Bitumen Butyl Tape
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