What is the reason why the process of large airflow ultrafine mill is not smooth

For most of the clients, or consider large production-oriented airflow crusher, a few kilograms per hour, dozens or even hundreds of kg of equipment, major equipment faces than small devices may have more questions, the first is the problem of equipment selection, because as a big equipment, choosing two adjacent models can adjust capacity by crushing time, if the material is better, It is better to achieve when there is no blocking phenomenon, but currently the grinding process of API industry is generally faced with the problem of not smooth:

Question 1: Pharmaceutical small fineness, grain is fine, such as reach 10-20 micron or more thin case, API illiquid, feeder can stable and continuous feeding, which affect the grinding efficiency and grinding particle size, such as initially set the feed speed is 5 kg, may be in 1 to 2 hours after speed back to 3 kg, 2 kg, 1 kg, Then gradually slow down, even no longer feeding, this requires a good design of feeding system, to ensure that a batch of materials can be smoothly crushed.

Question 2: Venturi plugging material, the problem is often met in API crushing industry, because of the effect of solvent and impurities, active pharmaceutical ingredients through a venturi jet material to the process of crushing plate will slowly on the venturi hole connected to a layer of membrane, and then went film is thicker, until the venturi mouth closed cannot feed grinding production, currently the only can solve the problem of this plugging material manufacturer maxim company, But the premise is that the material must be tested to ensure that, if a batch of material is 9 kg, then we use the 9 kg scheme to solve, to ensure that the material will not happen under the premise of crushing 9 kg, if it is 20 kg, then another scheme will be used.

Question 3: Crushing plate plugging material, with the passage of time, the department of grinding disc form very hard agglomeration bonding on the grinding ring, lead to crush space is smaller and smaller, zui cannot cause the clogging in crushing plate production, but the maxim jet mill has a special crushing solution, is the material after agglomeration to a certain degree will cease to continue to agglomerate, There were other ways to prevent caking.

Question 4: The filter structure of some company is with the method of induced draft fan and the back pulse jetting to collect material, this structure can lead to material after into the vertebral bodies at the bottom of the material gathered in the bottom of the vertebral bodies do not go down, the impact crushing process, maxim airflow crusher design, the use of special 逇 not happen this kind of phenomenon, the material will directly from inside the filter bag to fall to the bottom cyclone tube in the middle of the export, It will not cause the material to bond to the edge of the vertebral body, which will cause trouble to customers. Moreover, the vibrator will be added, and the effect is very poor. This structure is more of a disaster for fine materials. In addition, the dust removal method of pulse back blowing will affect the pressure in the crushing disc and affect the stability of particle size.

So when choosing the airflow grinder, the best steps are as follows:

1. Material testing, the purpose of testing is to see the distribution of particle size;

2. To see the operation of the equipment, as simple as possible;

3. See the difficulty of cleaning equipment, there is no dead corner;

4. Look at the collection rate of materials;

5. Take a look at what problems will occur in the material crushing process. When doing experiments, the more problems found, the better, so that the purchased equipment will be more able to meet the needs in the future;

6. Look at the comparison of crushing disk feed pressure and crushing pressure, at present most of the manufacturers feed pressure is greater than crushing pressure, the main reason is afraid of blowing back, but the crushing pressure is good crushing effect, so try to choose crushing pressure, small feed pressure equipment, crushing pressure particle size distribution is more concentrated;

7. Select only one collect mouth equipment, there are a lot of equipment as a result of the limitation of technical ability, after crushing material need two places to collect material, this will cause material uniformity problems, after crushing and by mixing two kinds of material, increase the link, so want to choose only one to collect material of equipment;

8. Do not use pulse backblowing dust removal equipment for feeding, which will affect the distribution of particle size;

9. Consider the feeding method of materials. Some feeding methods are from one of the nozzles of the crushing plate.