The meaning of food weight grader

Food weight graders have high economic value, but how do food graders divide? 1. The main working principle of the drum classification is that when the material flows into the drum through the hopper, it rolls between them, and then flows out through the corresponding holes in the process to achieve classification. The drum classifier has the characteristics of simple structure, high classification efficiency, stable operation and no dynamic imbalance. However, the machine occupies a large area, has a low opening rate, is difficult to adjust the screen cylinder, and has poor adaptability to raw materials. 2. Main components (1) Roller: This is a roller with holes. There are many holes in the rollers. Each group has a different pore size, but the pore size within the same group is the same. The rollers are arranged from the inlet to the outlet, and the aperture of the rear group is larger than that of the front group. In this way, the materials smaller than the first group of apertures fall out from the first group of sieve holes, and are collected into one level through the funnel, etc., to achieve the purpose of product classification. The drum of the weight classifier is a cylindrical screen punched by a stainless steel plate with a thickness of 1.5-2.0 mm. Considering the requirements of the manufacturing process, the entire drum is generally divided into several sections of cylindrical screens, and angle steel is used between the cylindrical screens. Strengthen the ring connection. If driven by friction wheels, they can also be used as rolling rings for the transmission. The rollers are supported on the frame by support rollers. The frame is welded with angle steel or channel steel. There are two ways to install the rollers: horizontal installation and inclined installation. Generally, the inclination angle between the roller and the horizontal position is about 3-7o. (2) Supporting device: It consists of rolling ring, friction wheel and frame. The roller ring is arranged on the drum and transfers the weight of the drum to the friction wheel. The roller is supported on the frame by the supporting roller, and the frame 7 is welded by angle steel or channel steel. The whole device is supported by the frame. (3) Collection hopper: The collection hopper is set below the drum, and the number of hoppers is the same as the number of classifications. (4) Transmission device: At present, the widely used transmission method is friction wheel transmission. The friction wheel is installed on the long axis, and there are friction wheels on both sides of the drum, which 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 has a friction wheel. After the drive shaft obtains power from the transmission system, it drives the friction wheel. The friction wheel is close to the rolling ring, and the rolling ring is fixedly connected to the rolling wheel. 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 rollers: The first type of weight classifier - gear transmission. The motor is driven by a pulley, a gearbox, a sprocket and a pair of gears. One of the large gears is connected to the edge of the drum outlet, and the other pinion is connected to the transmission system as a driving gear to transmit the power to the large gear to drive the drum to rotate. . This transmission method is troublesome, because the diameter of the drum is large, the rotation is unstable, and the lubricating oil on the gear often drips into the contaminated material of the drum, so it has been gradually eliminated. The second type - intermediate shaft drive. A transmission shaft is arranged on the center line of the drum, and the transmission shaft is connected with the drum through an arm. The transmission system transmits the power to the central shaft, which drives the drum to rotate. This transmission method is simpler than the first one. However, due to the long roller and the long central axis, it is difficult to set an intermediate bearing in the middle of the roller. Therefore, if the rigidity of the central shaft is slightly poor, it tends to cause unstable operation of the drum. At the same time, the use of this form is gradually decreasing as the material sometimes collides with the central axis and support arms, causing mechanical damage. The third type is the friction wheel drive. The friction wheel 4 is installed on the long axis, and there are friction wheels on both sides of the drum, which are symmetrical with each other, and the included angle is 90°. One end of the long shaft (drive shaft) is connected with the transmission system, and the other end is provided with a support roller, which is not connected with the transmission system. After the transmission shaft obtains power from the transmission system, it drives the friction wheel on it to rotate. The friction wheel is in close contact with the rolling ring 3, the rolling ring 3 is fixedly connected with the rolling wheel, and the friction force generated between the friction wheel and the rolling ring drives the rolling wheel to rotate. This transmission method is simple, reliable, stable and widely used. (5) Screen cleaning device: When working, the raw materials of the weight classifier should flow out through the screen holes corresponding to the diameter of the drum to achieve the purpose of classification, but the holes of the drum are often blocked by raw materials, which affects the classification effect. Therefore, it is necessary to set up a screen cleaning device to ensure that the raw materials flow out according to the corresponding aperture. The mechanical cleaning device is equipped with a wooden drum on the outer wall of the drum. The wooden drum is parallel to the central axis of the drum and is pressed on the outer wall of the drum by a spring. Due to the extrusion of the wooden roller, the raw material blocked in the hole is pushed back into the roller, or according to the actual situation of the raw material, the screen can be washed with water or brushed with a device.