1.The existing problems of the equipment.
1.1The lubrication of the chain of the apron feeders is difficult and the chain plate and the traction chain are easy to wear. Besides the maintenance frequency and the equipment noise is high.
1.2 Poor overall sealing of the equipment, easy to leak between the chain plate and the site environment is bad.
1.3The overall throughput is small, which cannot meet the current production requirements of alumina.
2.Design proposal. On the basis of the existing technology in China, the design and development of the new plate feeder is carried out with the technical advantages of the advanced apron feeders, which makes the conveying capacity of the equipment reach a new level. The performance of the whole equipment has been greatly improved, which can better to meet the needs of alumina. It is also suitable for long-distance transportation of solid materials in building materials, metallurgy, mining, chemical industry, coal and other industries.

3.The main structure and characteristics of the new heavy-duty apron feeders. The new heavy-duty apron feeders is mainly composed of driving device, spindle device, crawler chain, chain plate device, tail wheel device and tension device. The structure and characteristics of the new heavy plate feeder are mainly shown in the following aspects.
3.1The traction chain adopts the track chain of the supporting manufacturer, since it has small pitch error, high strength and not easy to deform. Besides it dont’t need to be lubricated in the service period. Daily maintenance and operation are convenient and fast. The bottom of the chain plate is all made of manganese steel, with a single arc lap structure, which is always in the state of lap in the process of working. It has impact resistance, wear resistance, no leakage between the chain plate, safe and reliable. Both sides of each chain plate are positioned by guide plate, which is firmly connected with the track chain by eight bolts to ensure accurate bite between the chain plates. The chain plate is welded with reinforced steel plate under the bottom plate, and the chain plate is supported by four rows of rollers when it is in operation. which can ensure that it can withstand the impact of large materials without deformation. The dust and noise on the machine site are greatly improved, and the operating environment of the workers is obviously improved.
3.2The head main bearing and the bearing in the tension slide seat are double-row roller bearing with a tension fixed sleeve. It has an accurate positioning, convenient installation and maintenance, greatly save the equipment maintenance time. Besides it saves a lot of manpower and guarantees the stability and continuity of alumina production.
3.3The new heavy-duty apron feeders runs smoothly and safely, with no leakage between the chain plates, the operation noise is significantly reduced, and the field environment is significantly improved.
3.4The whole frame of the new heavy-duty apron feeders adopts the welded i-beam structure, and there are several plates welded between the upper and lower flange plates, good rigidity and high strength. The parts where the tension slider is installed are machined with high dimensional accuracy to ensure the flexible operation of the tension slider.
The actual measurement of the new heavy-duty apron feeders passing through the site shows that the equipment indexes fully meet the design requirements. The equipment throughput meet the needs of production and workers of the field operating environment greatly improved. In addition, the equipment maintenance time is short, son it can save a lot of time, providing a practical guarantee for the safe production of alumina. At the same time, it can also make a certain contribution to the company.