Heavy duty apron feeder can be arranged under the raw material warehouse with a certain warehouse pressure. It is a kind of continuous transport machinery and equipment widely used in mining, cement, chemical industry, metallurgy and other enterprises. It is one of the important equipment in ore and raw material treatment and continuous production process. Based on personal practical experience, this paper expounds the safe operation of heavy duty apron feeder, hoping to share with peers. current situation of the development of construction macadam production line in china there are many macadam production lines that have been built and put into production in china, but their production capacity is uneven, from small private small stone factories with an annual output of tens of thousands of tons to well-known national enterprises with an annual output of tens of millions of tons of production lines, but the equipment used is basically the same. The main equipment is feeder, jaw crusher, spiral crusher and cone crusher, etc. The auxiliary equipment is mainly belt conveyor and dust removal system equipment.
The existing process flow of the gravel production line is roughly as follows: The large ore from the mine is uniformly sent to the jaw crusher for coarse crushing by the vibrating plate feeder through the raw ore bin, and the fine grained soil contained in the raw ore can be pre-screened by the vibrating feeder and transported by the belt conveyor. The coarse crushed ore is given to the crusher for fine crushing; the fine crushed ore is sent to the vibrating screen by the belt conveyor for screening, and the required gravel size is sent to the material yard by the belt conveyor; the gravel that does not meet the grain size requirements is returned by belt conveyor and then broken twice by crusher to form a closed-circuit repeated cycle to improve the utilization rate of resources. The chain plate selection of stamping welding structure, the use of precision tooling welding, after heat treatment of mechanical processing, to ensure that the circular arc lap between the chain plate high precision, the use of no leakage, can reduce unnecessary waste, chain plate has a high hardness and stiffness, very durable. 2. The production of building gravel is mostly carried out by some private small and medium-sized enterprises. From the point of view of the production line that has been built and put into production, almost all the vibratory feeders are used, which are divided into electromagnetic vibration feeders and inertial vibration feeders according to its vibration mode. This machine is mainly composed of body, spring, and transmission device. Vibrator is composed of two eccentric shaft and gear, driven by the motor, eccentric shaft rotation produces a lot of vibration force, so that the body in the supporting spring for strong vibration, the material is thrown forward in the trough, so that the material forward, to achieve the purpose of feeding. The feeder is composed of steel plate structure and grate structure, part of the steel plate structure can transport materials forward; the tail tension device adopts the structure of guide wheel, which can control the deviation during operation. The grate structure part can coarse screen the material, so as to remove some soil impurities contained in the raw ore. This kind of equipment is more suitable for ore feeding equipment with higher fluidity, its use effect is better. There are some defects in the vibrating feeder used in the production of gravel. The maximum feeding size of the vibrating feeder is only about 650mm, which is barely acceptable for some small and medium-sized private crushing stations, but most cement mines and mines have the best ore size above 1000mm. If the vibratory feeder is used to change some mining methods, shallow holes and blasting are needed. The use of narrow hole spacing and multiple rows of holes will increase the use of drilling rigs and increase the consumption of explosives. Due to the existence of some safety risks, explosives are strictly controlled in mining hills. The cost of drill hole will increase the investment, increase the blasting hole, increase the workload. Therefore, it is not suitable for the feeding equipment of large gravel production line, the second most important factor, vibration feeder working equipment vibration is relatively large, not easy to seal, dust removal effect is relatively poor, which is also the main factor of the production site dust exceeding the standard. At the same time, the noise generated by the equipment is larger, and the bearing heats up fast. The service life of equipment will be relatively reduced, wear increases, this will cause intermittent production, affect the output, for some small and medium-sized private gravel enterprises can barely accept, but for some cement, mine built large production line not only delays the time but also delays the production, virtually also increases the production and operation costs of enterprises; this equipment is not suitable for conveying mud ore and limestone, and large cement enterprises mine mining volume is larger, mixed with more soil. The feeding grate of the vibrating feeder should not bear the pressure directly, which makes the receiving warehouse do relatively more careful, many gravel plants simply use chute instead of the warehouse, so that the raw material can not be stored, the production is by the mining car will slowly dump the ore, artificial control of the ore supply, this will cause the ore supply fluctuation is relatively large, so that the follow-up equipment can not normal production, cause equipment idling, waste of electric energy, not only prolong the feeding but also increase the cost of production operation.
The heavy duty apron feeder is rotated by the motor, then drives the spindle to rotate through the coupling, reducer, etc., and drives the chain plate on the chain to move through the sprocket on the spindle device meshing with the chain. One end of the driving device is suspended on the sprocket shaft, the other end is a single point to support, without the foundation of the connection, the wheel transmission accuracy above is not affected by its foundation, easy to disassemble and repair, chain plate clearance can remove the fine soil in the raw material. The gear reducer of the driving device is often equipped with a backstop. The device can be installed horizontally or incliningly to prevent reversal during shutdown. The operating speed of the heavy duty apron feeder can be adjusted through the variable frequency motor device. Heavy duty apron feeder is one of the important equipment of the ore transmission system, commonly used in the bottom of the raw material warehouse, can continuously and evenly feed to the crusher, can work in some wet, open air and other harsh environment, this machine has been used in the crushing workshop of large concentrator and cement enterprises.
Heavy duty apron feeder can withstand the direct impact of dozens of tons of ore car unloaded materials, and has the advantages of conveying large density, large particle size, strong wear and other materials, generally conveying material density can reach more than 2400kg/m3, particle size of more than 1000 bandit, temperature about 450 degrees of material. Because the feeding size is large, it is just comparable to the ore of open pit mining in cement enterprises, which is suitable for the conveying equipment of continuous feeding and indirect feeding with different lengths and distances, and also has higher safety. When the feeding capacity is the same, the heavy duty apron feeder is only a few grades higher than the motor power of the vibrating feeder and consumes little. Secondly, the heavy plate feeding tail tension device adopts the guided structure, no need for lubrication when conveying, the machine is durable, long service life, easy to open and stop, stable and reliable operation. Convenient installation and maintenance, the machine is commonly used in the bottom of the raw material warehouse, because it can directly bear the pressure of ore in the mine warehouse, but also can make the raw material warehouse can be larger, can store more raw material stone, stable feeding, follow-up crushing operation is reliable, is conducive to protect the normal operation of the follow-up equipment, will not appear the situation of instant cut off. In the cement mine, the equipment is often installed in tilt, the maximum dip angle can reach 24 degrees, which makes the weight of the material borne by the feeder produce a component force in the direction of the length of the material, reduce the pressure of the material, reduce the load strength of the feeder. Due to the large angle of the feeder installation, on the one hand, when the heavy duty apron feeder is open and shut down, it can ensure that the ore in the warehouse will not make the heavy plate feeder trough rolling into the crusher; on the other hand, the height difference can be reduced in the equipment process configuration, and there are three kinds of assembly types: Right transmission, double transmission and left transmission. Along the material conveying direction, the driving device is right transmission on the right side, left transmission on the left side, and double transmission on both sides. Therefore, when installing the site, the site adaptability is stronger, and the platform of raw materials can be avoided to be too high and the cost of transportation can be enhanced
