Based on years of experience in the manufacture of granulators, I have written a few points of attention for this safe operation of the granulator, and I hope that I will be helpful to friends who are using the granulator or ready to use the granulator:
(1) The particle size of the powder to be granulated should have a certain proportion: the general livestock and poultry material is all passed through 8 mesh, and the 20 mesh sieve material is less than 30%. Ordinary fish feeds are all passed through 20 mesh, and the 3O mesh sieves are less than 35%. For the shrimp feed, all 35 meshes were passed, and the 60 mesh sieve was less than 25%.
(2) The purpose of feed quenching and tempering: a. Improve production efficiency; b. Extend the service life of the ring mold; C. Reduce energy costs; d. Paste starch to improve nutritional value.
(3) For every 15 °C increase in quenching and tempering temperature, the moisture content of the powder increases by 1%. The time for quenching and tempering of common livestock and poultry is 25 to 40 s, and the fish material is over 60 s.
(4) When producing high or high protein feed of milk powder, the temperature is controlled at 60-65 °C, and the moisture should be controlled at 13% to 14% after quenching and tempering.
When producing low-grade suckling pigs, the summer temperature is controlled at 7O-82°C, and the winter temperature is controlled at 7O-74°C. After quenching and tempering, the moisture should be controlled at 15%-16%. When producing ordinary pig and poultry materials, the temperature is controlled at 82-88 °C, and the moisture should be controlled at 16% to 17% after quenching and tempering. When producing dairy cows, the temperature is controlled at 60-62 °C, and the moisture should be controlled at 12% to 13% after quenching and tempering.
1 Preparation before starting up
First check the schedule of this shift, understand the work record of the previous shift, and check whether the distribution of pellets in the warehouse is consistent with the listing signal on the production plan and control panel. Then thoroughly clean the internals of the cooler, airlock, pipe and granulator (only clean the inside of the granulator before the night shift).
According to the production variety, the coarse granulator cutter is used to check or replace the grading screen surface specifications. If the crushed material is produced, the crusher fast and slow roller gap must be coarsely adjusted to produce a qualified product.
Check the guide knives, scrapers, press rolls, ring molds of the granulator, and the position of the guide knives. If the scraper is severely worn, the viscous feed will be produced, and the granulator will be easily blocked. If the press roll is severely worn, a small amount of variegated pellets will appear. If the ring mold is not machined with a high-speed gun, it should be ground for 30 min with a mixture of clear and fine sand before use. If it is a stainless steel ring mold machined with a high-speed gun, it can be used without grinding. However, when you first start using it, you should add less steam and slow down the production speed. After running for 1 h, the running-in period can be completed. If the ring mold is delayed due to the long time of use, the slow drilling machine can be used to re-expand the hole to prolong the service life. Next, adjust the gap between the granulator pressure roller and the ring die, let the ring die idling, and press the roller to stop when it is time to turn.
At this point, preparations before the start of construction are basically ready.
2 Start the granulation system and maintain the best state
Improper operation of this process will directly affect the production and product quality of the entire production shift.
In order to prevent the occurrence of the blocking phenomenon, the relevant equipment is started from the back to the front according to the process flow, and the starting sequence is as shown in Fig. 2.
Start the main motor of the granulator, do not add steam, open the granulator bypass door, and let a little black granular material discharge to the ground. Then start the conditioner, let the small amount of powder that has just started to be discharged to the ground, to prevent the material from getting wet by the pressure roller; then start the feeder slowly, without steam, and use the dry powder to extrude the ring mold. The material is placed side by side on the ground, and after the extruded pellets are normal in color, the pellets are allowed to enter the cooler.
Add a small amount of steam, and at the same time accelerate the feeder, keep the granulator at 50% load, slowly feed the material available on the ground into the ring mold, and then increase the feeding speed to make the granulator full load. Running.
Increase the amount of steam, wait for tens of seconds, the main motor current of the granulator will fall back, increase the feeding speed again, and let the granulator be fully loaded. Then increase the amount of steam, wait for tens of seconds, the main current of the granulator will fall back again and again, until the steam is added, the main current of the granulator will not fall back, indicating that the powder moisture has reached the maximum, the granulator Full load. Full load indicates that the main current of the granulator reaches 90% of the rated current.
Open the artificial feeding door of the granulator, grab the powder after quenching and tempering by hand, feel hot, then loosen, the material becomes agglomerate, gently spread and then naturally spread. If the material is too thick, it should be reduced. The amount of steam. Conversely, if the material is too loose, the amount of steam is increased. Use a spoon to take some freshly prepared hot material from the granulator blanking tube, and squeeze it between the mother finger and the index finger to make it flattened without loosening.
Observe the granulator ammeter. If the ammeter pointer does not swing to a large extent, it means that the whole granulation system is in the best stable state.
The environment around the granulator was cleaned for 10 minutes to keep it clean.
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