In the process of feed processing, raw material cleaning is an important part. Occasionally, due to imperfect cleaning procedures, such as clogging of the chute, poor material path, idling of the conveying machinery, damage to the smasher screen and the die of the granulator, or breakdown, may occur. To avoid the above phenomenon, the following points should be noted in the design of the cleaning process.
Reasonable design and use of grid screen
The grid screen is generally placed at the receiving port and is the first step in the cleaning process. Because its composition is too simple, it is often the most easily overlooked. The grid design should first consider the selection of a reasonable grid gap. The size of the grid gap is generally determined by the geometry of the material. For corn, powdery by-products and rice, the sieve gap should be within 3 cm. For oil mites, the sieve gap should be between 3 cm and 5 cm. At the same time, the screen gap should be fixed during use, and the large amount of the screen should be removed in time. This can effectively achieve the purpose of preliminary screening.
In the process, the horizontal conveying machinery should be arranged reasonably.
Due to the low cost of horizontal conveying machinery, high conveying efficiency, and simple structure, it is widely used in feed processing. However, due to improper use of the location, the failure rate is correspondingly higher. More common is: the material after the initial cleaning of the grid screen is directly sent to the hoist by the auger or scraper. Due to the cleaning process of the material through the grid screen, many shorter hemp ropes, smaller sacks and other impurities can easily entangle or jam the horizontal conveying machinery, resulting in lower efficiency of use of these equipments and heavy burning of the motor. A certain economic loss. Therefore, in the process design, horizontal conveying machinery should be avoided to be used before the primary cleaning and magnetic separation equipment. The material of the lower hopper is preferably sent directly to the hoist through the slip tube. This minimizes the effects of large miscellaneous materials on the conveyor.
Reasonable selection of process parameters of the cleaning cylinder
The primary cleaning cylinder is the main equipment for the cleaning process.
It is used to remove the hemp rope, sack pieces, stones, mud and other debris in the material, and the selection of the process parameters has a direct impact on the cleaning effect. In the design and selection of the screening, the following issues should be noted:
The appropriate mesh diameter should be selected according to the physical properties and geometrical dimensions of the sieving material.
Adjustable dust removal air volume should be selected. This condition can be achieved by placing a valve above the air inlet.
Choose ample production capacity. In general, the processing capacity of the screen in the design parameters should be 30% higher than the transport capacity of the conveying equipment of the previous process.
In the design, pay attention to the reasonable selection of the above parameters, can effectively improve the ergonomics of the screen.
Reasonable selection of magnetic separators
Impurities such as nails, bolts, nuts, and small iron blocks mixed in the feed ingredients are the most harmful to the high-speed pulverizer and granulator. Lightly, the bottom of the screen is broken down, which in turn damages the stamper and burns the motor. A reasonable location setting is very important.
There are two types of magnetic separation equipment commonly used in design, one is a permanent magnet cylinder and the other is a permanent magnet roller. The former is small in size, small in floor space, no power consumption, and the demagnetization effect is also ideal. However, it is only suitable for powders and light materials with small geometrical dimensions. Moreover, the adsorbed metal foreign matter needs to be manually removed periodically. Compared with the latter, the cost is relatively high and the volume is large, but it is also applicable to materials such as cakes with large geometrical dimensions and bran which should be agglomerated. Although there is power consumption, it can automatically remove the adsorbed metal foreign matter in time. The high position setting in the process is more suitable. However, in the design of smaller feed mills, limited by factors such as capital and plant area, the inexpensive permanent magnet cylinders are more commonly used.
The location of the magnetic separator in the process of
The magnetic separator is placed after the primary cleaning screen and before the pulverizer, so that the metal impurities in the particulate raw material can be effectively removed to avoid damage to the pulverizer.
A magnetic separator is placed on the granule powder bin. This can effectively prevent the metal impurities mixed in the raw material from entering the granulator to cause damage to the stamper.
A magnetic separator is placed on the packing scale. This method is not commonly used in process design, but it is necessary to further improve and ensure the quality of finished feed for the removal of metal foreign matter in the raw material of the unpurified by-product.
Transparent Case Steel Tape Measure
1. Shell: ABS new plastic, with shiny texture; anti-drop, wear-resistant, and not easy to deform.
2. Ruler: Use 50# first-grade strip steel with a thickness of 10 wires (0.10mm); the ruler surface is the most advanced environmentally friendly paint: odorless, smooth and wear-resistant, bright colors, clear and bright scales
3. Braking: With upper, side and bottom three-dimensional braking, the hand control feels stronger.
4. Ruler hook: The rivet ruler hook structure is not easy to deform and ensures more accurate measurement.
5. Carrying straps: rubber and nylon; high-grade and high-quality; strong and durable, and feel good.
6. Foot spring: generally 50# carbon steel, 65# manganese material: strong toughness and high accuracy.
7. Anti-drop protective cover: high-quality plastic, prevent breakage and collision damage, and enhance durability.
8. Labeling: can be produced according to customer requirements.
Transparent Case Steel Tape Measure,Rust Proof Tape Measure,Stainless Tape Measure,Metal Case Tape Measure
Yucheng tengxu Measuring Tool Co., Ltd , https://www.hardwaretoolstape.com