How does the drum machine classifier classify food?

As people's requirements for food are getting higher and higher, and it is also convenient for food processing and packaging, food grading machines came into being, which solves many insurmountable shortcomings of manual grading, improves labor productivity, and reduces production costs. Therefore, food graders have been widely used and developed in the food processing industry. The drum classifier is an important sort of polarizer, so how does it classify? Working principle The main working principle of drum grading is that when the material flows into the drum through the hopper, it rolls and moves in between, and flows out through the corresponding holes in the process to achieve classification. The characteristics of the drum classifier: simple structure, high classification efficiency, stable work, and no power imbalance. However, the machine occupies a large area and has a low opening rate. Due to the difficulty in adjusting the screen cylinder, the adaptability to raw materials is poor. Main components (1) The drum is a rotating drum with holes. There are many small holes on the drum. The diameter of each group of small holes is different, but the diameter of the same group is the same. The rollers are arranged along the material inlet to the outlet, and the hole diameter of the rear group is larger than that of the front group. In this way, materials smaller than the first group of apertures fall out of the first group of sieve holes and are collected in a funnel into a level, and so on to achieve the purpose of product classification. The drum is a cylindrical cylindrical screen made of stainless steel plates with a thickness of 1.5-2.0 mm after being punched. Taking into account the requirements of the manufacturing process, the overall drum is generally divided into several cylindrical screens, and the angle steel is used as the reinforcing ring between the cylindrical screens. If the friction wheel is used for transmission, it can also be used as the transmission ring. The roller is supported on the frame by supporting rollers, and the frame is welded by a marine angle steel or channel steel. There are two ways to install the roller: horizontal and inclined. Inclined type is generally to make the drum and the horizontal position at an inclination angle of about 3-7o. (2) The supporting device is composed of a rolling ring, a friction wheel and a frame. The rolling ring is mounted on the drum and transmits the weight of the drum to the friction wheel. The drum is supported on the frame with supporting wheels, and the frame 7 is welded with angle steel or channel steel. The entire equipment is supported by the frame. (3) Collection hopper The collection hopper is set under the drum, and the number of hoppers is the same as the number of grading. (4) The currently widely used transmission method of the transmission device is friction wheel transmission. The friction wheel is mounted on a long shaft, and there are friction wheels on both sides of the drum, and they are symmetrical with each other, and the included angle is 90°. One end of the long shaft has a transmission system, and the other end is equipped with a friction wheel. After the driving shaft gets power from the transmission system, it drives the friction wheel to drive. The friction wheel is close to the rolling ring, and the rolling ring is fixed on the drum. Therefore, the friction force generated between the friction wheel and the rolling ring drives the drum to rotate. There are three ways to drive the drum. The first is gear transmission. The electric motor is driven by a belt pulley, a gearbox, a sprocket, and a pair of gears. One of the large gears is connected to the edge of the drum discharge port, and the other small gear is connected to the transmission system as a driving gear to transmit power to The big gear drives the drum to rotate. This kind of transmission method is more troublesome in processing and manufacturing. Due to the large diameter of the drum, the rotation is not stable, and the lubricating oil on the gears often drips into the contaminants in the drum, so it has been gradually eliminated. The second type-intermediate shaft transmission. There is a drive shaft on the center line of the roller, which is connected with the roller by a support arm. The drive system transmits the power to the central shaft, and the central shaft drives the roller to rotate. This transmission method is simpler than the first one, but because the drum is longer, its central axis is also long, and it is difficult to install an intermediate bearing in the middle of the drum. Therefore, if the rigidity of the central axis is slightly poor, it will often produce deflection and cause the drum The operation is not stable. At the same time, because the material sometimes collides with the central axis and the support arm to cause mechanical damage, the current use of this form is gradually decreasing. The third type-friction wheel drive. The friction wheel 4 is mounted on a long shaft, and there are friction wheels on both sides of the drum, and they are symmetrical with each other, and the included angle is 90°. One end of the long shaft (active shaft) is connected with the transmission system, and the other end is equipped with a supporting wheel, which is not connected with the transmission system. After the driving shaft gets power from the transmission system, it drives the friction wheel on it to rotate. The friction wheel is close to the rolling ring 3, and the rolling ring 3 is fixed on the drum. Therefore, the friction generated between the friction wheel and the rolling ring drives the roller to rotate. . This kind of transmission is simple and reliable, and it runs smoothly. It is more and more widely used. (5) When the cleaning device is in operation, the raw materials should flow out through the sieve holes of the corresponding diameter of the drum to achieve the purpose of classification, but the holes of the drum are often blocked by the raw materials, which affects the classification effect. Therefore, it is necessary to set up a cleaning device to ensure that the raw materials flow out according to the corresponding aperture. The mechanical cleaning device is to install a wooden roller on the outer wall of the cylinder. The wooden roller is parallel to the central axis of the roller, and the outer wall of the roller is pressed by a spring. Due to the squeezing of the wooden rollers, the raw materials blocked in the holes are squeezed back into the drum. Depending on the actual raw materials, water flushing or device brush cleaning can also be used.