EP-3560355-B1 - MANUFACTURING METHOD AND MANUFACTURING DEVICE FOR TRACE ELEMENT SUPPLEMENT GRANULES

Inventors

• HUANG, YIQIANG
• TAO, Jianjun
• YAO, Yajun
• DENG, MIN
• PENG, Hongxing
• XIA, Feihui
• ZHANG, Yawei

Dates

Publication Date

20260506

Application Date

20180305

Claims (4)

1. An apparatus for preparing micronutrient supplement granules, comprising: a tablet press (1), a first grinding and granulate machine (2), and a screening unit; a discharge end of the tablet press (1) is connected to a feed end of the first grinding and granulate machine (2); a discharge end of the first grinding and granulate machine (2) is connected to a feed end of the screening unit; wherein the screening unit comprises a primary screening machine (3) and a secondary screening machine (4); a feed end of the primary screening machine (3) is connected to the discharge end of the first grinding and granulate machine (2), and a discharge end of the primary screening machine (3) is connected to a feed end of the secondary screening machine (4); wherein the tablet press (1) comprises a pressing feed bin (101); a lower part of the pressing feed bin (101) is connected to a feed end of a pressing feeding screw (102); a discharge end of the pressing feeding screw (102) is connected to a pressing roller (103); the conveying speed of the pressing feeding screw (102) is from 30 r/min to 60 r/min; the pressure applied by the pressing roller (103) is from 4 MPa to 20 MPa; wherein a screen of the primary screening machine (3) is a grid screen, and a screen of the secondary screening machine (4) is a round hole screen; the screen of the primary screening machine (3) has a grid size of 8 mm × 8 mm to 3 mm × 3 mm, and the screen of the secondary screening machine (4) has a round hole diameter of 0.8 mm to 2.1 mm; wherein a feed end of the tablet press (1) is connected to a pressing feeding device; the pressing feeding device comprises a pressing vacuum feeder (5), which is connected to a feeding bucket (6) through a pipeline.
2. The apparatus of claim 1, wherein a screening vacuum feeder (7) and a screening bin (8) are provided between the first grinding and granulate machine (2) and the screening unit; a feed end of the screening vacuum feeder (7) is connected to the discharge end of the first grinding and granulate machine (2) through a pipeline; a discharge end of the screening vacuum feeder (7) is connected to a feed end of the screening bin (8), and a discharge end of the screening bin (8) is connected to the feed end of the primary screening machine (3).
3. The apparatus of claim 2, wherein a coarse granule outlet of the primary screening machine (3) is connected to a feed end of a second grinding and granulate machine (9), and a discharge end of the second grinding and granulate machine (9) is connected to the feed end of the screening vacuum feeder (7) through a pipeline; fine powder outlets of the primary screening machine (3) and the secondary screening machine (4) are both connected to a fine powder buffer hopper (10); the fine powder buffer hopper (10) is connected to a feed end of the pressing vacuum feeder (5) through a pipeline.
4. The apparatus of claim 3, wherein the primary screening machine (3) and the secondary screening machine (4) are flexibly connected through a sack; the screening bin (8) and the primary screening machine (3) are flexibly connected through a sack; the primary screening machine (3) and the second grinding and granulate machine (9) are flexibly connected through a sack; and the fine powder buffer hopper (10) and the fine powder outlets of the primary screening machine (3) and the secondary screening machine (4) are flexibly connected through a sack.

Description

TECHNICAL FIELD The present disclosure relates to the technical field of micronutrients, particularly to an apparatus for preparing micronutrient supplement granules. BACKGROUND Micronutrient supplements, namely minerals and vitamins, are nutrients less needed by human and animals, and have effects on strengthening survival abilities, growth, health and/or fecundity of human and other animals. The micronutrient supplements, such as basic salts, hydroxy-methionine chelates, threonine chelates and the like, are usually powdery. When the powdery micronutrient supplements are directly added in various foods or feeds, other nutrients in the foods or feeds may be destroyed. Furthermore, direct addition of the powdery micronutrient supplements produces dust, which harms workers and environments. Therefore, it is necessary to prepare the powdery micronutrient supplements into granules with a certain diameter and strength. According to the existing methods/devices for preparation of micronutrient supplement granules, a powdery product is usually dissolved, then a binder is added therein, and the granules are prepared by spray drying. For example, the Chinese patent No. CN201280051529.5 introduces a method for preparing granules, in which micronutrient supplements and a digestible binder are agglomerated, and then spray dried to form the granules. The disadvantages of such device include the complexity of the production process due to the addition of a binder, the high cost of spray drying, the low content due to the addition of a carrier, and the low strength of granules that leads to friable granules. Document CN205547224 U discloses an integrated production equipment for amino acid particles, comprising a feeding bin, a humidifier, a conveying mechanism, a granulation mechanism and a return mechanism connected in sequence; wherein the conveying mechanism comprises a quantitative screw feeder and a bucket elevator; the granulation mechanism comprises a buffer bin, a forced screw cage, a roller tablet press, a crushing and granulating machine and a granulation silo; and the return mechanism comprises a swing screen, a return silo and a return screw feeder connected with the conveying mechanism. However, the bucket elevator used in this device will create much dust during production which is harmful for workers and the environment; further, the device cannot produce granules of a sufficient strength either. SUMMARY The technical problem to be solved by the present disclosure is to overcome the defects and disadvantages mentioned in the above background of the disclosure, so as to provide an apparatus which is used to prepare micronutrient supplement granules with high qualities in a high production efficiency. In order to solve the above technical problem, the technical solutions presented by the present disclosure are as follows: There is provided in the present disclosure an apparatus for preparing micronutrient supplement granules. The apparatus comprises a tablet press, a first grinding and granulating machine, and a screening unit. A discharge end of the tablet press is connected with a feed end of the first grinding and granulating machine. A discharge end of the first grinding and granulating machine is connected to a feed end of the screening unit. The screening unit comprises a primary screening machine and a secondary screening machine. A feed end of the primary screening machine is connected to the discharge end of the first grinding and granulating machine, and a discharge end of the primary screening machine is connected to a feed end of the secondary screening machine. Further improvements of the above technical solution are as follows. According to the invention, a screen of the primary screening machine is a square-mesh screen, and a screen of the secondary screening machine is a round-mesh screen. With the two-stage screening, the screening fractions are more complete, the granules with a certain diameter can be obtained, and the one-time granulation rate is high. The square-mesh size of the screen of the primary screening machine is ranging from 8 mm × 8 mm to 3 mm × 3 mm, and the round-mesh diameter of the screen of the secondary screening machine is ranging from 0.8 mm to 2.1 mm, in which the primary screening machine has two screens, in which the upper screen has the larger square-mesh size of 8 mm × 8 mm and the lower screen has the smaller square-mesh size of 3 mm × 3 mm. More preferably, the square-mesh size(s) of the screen(s) of the primary screening machine is ranging from 5 mm × 5 mm to 4 mm × 4 mm, and the round-mesh diameter of the screen of the secondary screening machine is ranging from 1.0 mm to 1.5 mm. The primary and the secondary screening machines adopting the above screen sizes achieve a better screening effect. According to the invention, the tablet press comprises a pressing feed bin. The lower part of the pressing feed bin is connected to a feed end of the pressing feeding scr