summarize
Pelletizer is a molding machine that can make materials into specific shapes. Can be widely used in chemical, petrochemical, pharmaceutical food, building materials, mining and metallurgy, environmental protection, printing and dyeing, ceramics, rubber, plastics and other fields. The energy saving of pelletizer can be divided into two parts: one is the power part and the other is the heating part. The power required by the granulator is proportional to the amount of extrusion, and is exponentially related to the size of the filter. In the cold pelleting system, the solidified polymer is pelleted at the end of the process, while in the die surface hot pelleting system, the molten polymer is pelleted when it emerges from the die and the pellets are cooled downstream.
Working principle
The working principle of the extrusion granulator: the extrusion form has two kinds of front discharge and side discharge, the prepared material is injected from the top of the silver extrusion granulator, and there is a vertical spiral rod in the groove, through the rotation of the spiral rod, the material is forced to the bottom between the two rollers for extrusion, the two rollers relative rotation, so that the sent material into the cake shape. The cake bar then enters the granulator and is broken by rotating knife row. The crushed material enters the granulator and parts of the powder material enter the rotary vibrating screen for screening through rolling knife row. The qualified particles pass by being sent outside. The sifted powder material is sent back to the raw material bin for secondary roll pressing, and the extrusion pressure can be controlled by the hydraulic system according to the needs of granulation. By changing the grooving form of the roll surface, the materials such as sheet, strip and flat ball can be obtained.
Apply
Granulator can be widely used in chemical, petrochemical, pharmaceutical, food, building materials, mining treatment, environmental protection, printing and dyeing, ceramics, rubber plastics and other industries need granulation products.
sort
Pelletizer can be divided into: underwater pelletizer, air pelletizer. Granulation method: pressure molding granulation method, stirring rolling granulation method, hot melt cooling granulation method, spray drum granulation method, spray fluidized bed granulation method.
Selection guide
How should the granulator choose the granulation method when granulating?
1, material characteristics: the material is powder or molten liquid, slurry and sound paste of the material can be pumped and atomized, matter
Whether the material has heat sensitivity, etc., must be considered when choosing 2, the requirements for production capacity: if the required production capacity is larger, there are many methods can not be applied. 3, the particle size and particle size distribution requirements: some methods, such as spray drying granulation can only get very fine particles, the powder granulation method can only get smaller particles, and some other methods, such as pressing, can get large clumps. 4, the shape of the pellet: rolling, stirring granulation, spraying granulation is to get approximately spherical particles, shot peening cooling solidification granulation can get completely spherical particles, extrusion granulation can produce column particles. The possible effects of different shapes of particles on subsequent work should be estimated.
5, the strength of aggregates: the particles obtained by powder agglomeration, shot peening granulation, its mechanical strength is weak. If you need high strength particles, you need to use pressing method or sintering, roasting to strengthen, with extrusion molding to choose a high strength binder.
6, the void ratio and density of pellets: the gap ratio and density are closely related to the strength, and some extrusion granulation processes can better control the void ratio and density to meet the needs of certain applications.
7, wet method and dry method: wet granulation requires expensive solvents, and drying after taking medicine, may cause solvent loss Some materials may be sensitive to solvents and not suitable for wet method, some materials may recrystallize into different shapes during drying, and can not be used wet method, dry granulation is easy to produce powder, not suitable for handling toxic chemicals and other dangerous materials. 8, space limitations: For example, extrusion method, with a smaller device can get a higher production capacity, while some other methods, such as shot peening granulation, require a higher vertical space to install tower equipment.
In the selection, at least two different granulation methods can be selected initially, and then further fine consideration can be made through the test. Then consider whether the reliability and flexibility of the equipment are easy to manufacture and maintain, and make the final choice under the principle of minimum total cost under the required output.
maintenance
Pelletizer equipment maintenance can be through wiping, cleaning, lubrication, adjustment and other general methods.
1, clean, equipment inside and outside clean, the sliding surface, lead screw, rack, gear box, oil hole and other places without oil, no oil leakage, no air leakage, equipment around the debris, debris, dirt mechanical engineers to clean;
2, neat; Tools, accessories, workpieces (products) should be placed neatly, pipelines, lines should be organized;
3, good lubrication; Refueling or oil change on time, constant oil, no dry friction phenomenon, normal oil pressure, bright oil label, smooth oil circuit, oil quality meets the requirements, oil cup, felt clean;
4, safety, comply with the safe operation procedures, do not overload the use of equipment, equipment safety protection device is complete and reliable, timely elimination of unsafe factors.
Matters needing attention
The granulator should run forward to avoid reversal.
The granulator is forbidden to run the empty machine without load, and the heat engine must be fed to run, so as to avoid sticky bars (holding shafts)
It is strictly forbidden to enter the iron and other debris in the feed port and vent hole of the granulator. So as not to cause unnecessary accidents, affecting the safety of permanent pr
1. Pay attention to the temperature change of the fuselage at any time, and when touching the sliver without touching it with clean hands, it should be heated immediately. Until the cops get their hands on it.
When the bearing part of the reducer burns hands, or accompanied by noise, it should be stopped and repaired in time, and added refueling. 2
3. When the bearing parts at both ends of the main engine bearing room are hot and burn hands or there is noise, it is necessary to stop the maintenance and add butter. The normal working bearing room is filled with butter every 5-6 days. A surname
4, pay attention to find out the operation law of the machine, such as: machine temperature, speed, can be handled in time according to the situation.
5, when the fuselage is not stable, pay attention to check whether the gap between the shaft connector is too tight, and adjust it in time.
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