Conveyor type and selection
21st September 2022
Conveyors have a long history. When the ancient Egyptians built the pyramids, they began to use the principle of "rotation" to move the stone. The current conveyor prototype is said to have emerged from the 19th century when the U.S. auto industry pushed for automation. Today, conveyors are widely used in various industries, such as automatic production lines in mines, ports and terminals. With the construction of logistics centers as automated labor-saving conveyor systems, a large number of conveyors have been put into use.
In general, a conveyor is a conveying machine that can convey articles continuously.
A conveyor can be defined as a machine that uses the upper structure as a support surface to carry the goods to be moved;
The definition of the conveyor in the American conveyor industry is: from a certain or arbitrary loading to the unloading place, through the set route, the bulk packaging and other goods are transported, and the water is not inclined and the vertical way;
There are two points highlighted here for mechanical equipment:
from loading to unloading place;
Machinery for moving goods along a set route;
The most notable features of the conveyor are: the correctness of continuous handling and handling time within a certain interval;
According to the drive mode, it can be divided into two categories: gravity drive and power drive;
According to the structure and transmission mode: the roller conveyor is also called the roller table or the roller conveyor; the two ends of the shaft passing through the center line of the roller are fixed on the brackets on the left and right sides, and several or more fixed rollers are arranged at certain intervals. The arrangement constitutes a roller conveyor.
Roller: Also known as idler or roller; it is formed by installing bearings at both ends of the cut pipe. The rollers can be divided into straight type and conical type according to the shape. Linear type is used for linear roller conveyors, and conical type is used for rounded angle roller conveyors. According to the application, the rollers can be made of steel, aluminum, stainless steel, resin and other materials.
Roller conveyors are divided into two categories according to the driving method: gravity (driven) roller conveyors and power (driven) roller conveyors.
Gravity roller conveyor is a machine that continuously transports items by its own weight. Strictly speaking, when the conveyor is in an inclined state, it uses its own weight to transport the items. When the conveyor is in a horizontal state, it does not rely on gravity, but through manual labor. or other external force to move the item. The advantages of gravity roller conveyor are that it does not need power, simple structure, low maintenance cost, low price and easy change of layout. But there are also the following problems:
Since items are moved by their own weight on an inclined roller conveyor, the longer the conveyor, the faster the moving speed is due to the acceleration;
Heavy items move fast, and light items move slowly or not. When the light and heavy items are transported by the roller conveyor at the same time, and the weight of the commercial items is quite different, the items will collide due to the difference in the moving speed, causing the items to be damaged or detached from the roller table;
Because the carton is easy to absorb moisture and get damp, even if the inclined angle of the roller conveyor is certain, the problem of time-shifting and stopping of items will occur due to the humidity change in the rainy or dry season; the design inclination of the gravity roller conveyor is expressed by the self-moving inclination. , and its value will change slightly with the temperature and humidity of the goods being transported and the ground state and the temperature and humidity of the outside world. Therefore, it is difficult to obtain the correct value.
Gravity roller conveyors use different materials for rollers according to their use parts, and become various (material) series of gravity roller conveyor products.
Article source: 机械女007