CN109622252B - High-efficiency powder selector of external circulation pulverizer - Google Patents
High-efficiency powder selector of external circulation pulverizer Download PDFInfo
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- CN109622252B CN109622252B CN201910064611.5A CN201910064611A CN109622252B CN 109622252 B CN109622252 B CN 109622252B CN 201910064611 A CN201910064611 A CN 201910064611A CN 109622252 B CN109622252 B CN 109622252B
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- 239000000843 powder Substances 0.000 title claims abstract description 119
- 230000001502 supplementing effect Effects 0.000 claims abstract description 11
- 238000000227 grinding Methods 0.000 claims description 10
- 230000005540 biological transmission Effects 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 2
- 238000003801 milling Methods 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 2
- 238000010992 reflux Methods 0.000 abstract description 2
- 238000007599 discharging Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000009700 powder processing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
- B04C5/00—Apparatus in which the axial direction of the vortex is reversed
- B04C5/08—Vortex chamber constructions
- B04C5/081—Shapes or dimensions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/10—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of crushing or disintegrating zone
- B02C23/12—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of crushing or disintegrating zone with return of oversize material to crushing or disintegrating zone
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
- B04C5/00—Apparatus in which the axial direction of the vortex is reversed
- B04C5/08—Vortex chamber constructions
- B04C5/103—Bodies or members, e.g. bulkheads, guides, in the vortex chamber
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
- B04C5/00—Apparatus in which the axial direction of the vortex is reversed
- B04C5/14—Construction of the underflow ducting; Apex constructions; Discharge arrangements ; discharge through sidewall provided with a few slits or perforations
Landscapes
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Combined Means For Separation Of Solids (AREA)
Abstract
The invention discloses a high-efficiency powder selecting device of an external circulation pulverizer, which comprises a classifier, wherein the lower opening of a shell of the classifier is arranged at the upper opening of a coarse powder discharge hopper through a return air box, and the return air box is communicated with a supply air pipeline of a system through an air inlet pipe; the powder inlet pipe of the classifier is arranged on the upper cover of the shell, the qualified powder outlet pipe of the classifier is arranged on the powder outlet cylinder body above the impeller assembly, the bottom of the upper cover is provided with a guide cylinder covering the impeller assembly, a blanking annular cavity is formed between the guide cylinder and the shell, the upper opening of the blanking annular cavity is communicated with the powder inlet pipe, the blanking annular cavity is communicated with the air supplementing pipe tangentially on the shell correspondingly, and the air supplementing pipe is communicated with the air supply pipeline to form cyclone in the blanking annular cavity. The invention improves the concentration degree of the fine powder in the classification area, improves the classification effect, avoids the situation that the qualified powder and the unqualified powder are mixed in the classification area in the traditional technology, reduces the reflux of the qualified powder and improves the classification efficiency.
Description
Technical Field
The invention relates to a powder processing equipment part, in particular to a high-efficiency powder selector of an external circulation pulverizer.
The background technology is as follows:
the pulverizer is equipment widely used in the mineral powder industry.
On the basis of traditional internal circulation classification of powder, a pulverizer has been developed to an external circulation classification stage of powder, namely, powder milled in a pulverizer main machine enters an external classification system through a base blanking port.
The machine outer grading system conventionally comprises a grading elevator, a returning elevator, a grading machine and a cyclone separator, wherein a feeding port of the grading elevator is communicated with a blanking port of a grinding host machine through a pipeline, a discharging port of the grading elevator is communicated with a feeding port of the grading machine through a pipeline, a discharging port of a qualified product of the grading machine is communicated with a feeding port of the cyclone separator through a pipeline, a discharging port of an unqualified product of the grading machine is communicated with a feeding port of the returning elevator through a pipeline, and a discharging port of the returning elevator is communicated with a feeding port of the grinding host machine through a pipeline.
In the prior art, the classifier is installed on the hopper through the return air box, in actual production, the unqualified products discharged from the hopper still contain qualified powder (fine powder) with more components, and the qualified powder is returned to the main grinding machine along with the unqualified products (coarse powder) to participate in grinding, so that the working efficiency of the classifier is low due to transitional grinding, and finally the productivity of the pulverizer is low.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to solve the technical problem of providing the high-efficiency powder selector of the external circulation pulverizer for effectively improving the productivity.
The technical scheme of the high-efficiency powder selector of the external circulation pulverizer comprises a classifier, wherein the lower opening of a shell of the classifier is arranged at the upper opening of a coarse powder discharge hopper through a return air box, and the return air box is communicated with a supply pipeline of a system through an air inlet pipe; the powder inlet pipe of the classifier is arranged on the upper cover of the shell, the qualified powder outlet pipe of the classifier is arranged on the powder outlet cylinder body above the impeller assembly, the bottom of the upper cover is provided with a guide cylinder covering the impeller assembly, a blanking annular cavity is formed between the guide cylinder and the shell, the upper opening of the blanking annular cavity is communicated with the powder inlet pipe, a wind supplementing pipe is communicated with the wind supplementing pipe in a tangential mode on the shell corresponding to the blanking annular cavity, and the wind supplementing pipe is communicated with the wind supplying pipeline to form cyclone in the blanking annular cavity.
In order to slow down the powder falling speed, the guide cylinder is designed into an inner cone with a small upper part and a large lower part, the upper part of the shell is designed into an outer cone with a small upper part and a large lower part, and the lower part of the shell is designed into an outer cone with a large upper part and a large lower part.
In order to increase the classified wind power of the powder selection, the installation parts of the shell and the air return box are provided with air ducts which reduce the air inlet area and improve the wind speed.
In the preferred scheme, the air duct in the air return box is designed into a conical shape with a small upper part and a large lower part, and the air duct in the shell is designed into a cylindrical shape.
Conventionally, a motor which drives the impeller assembly to operate through a belt pulley transmission pair is arranged on the powder outlet cylinder body opposite to the qualified powder outlet pipe.
The invention has the beneficial effects that:
the high-efficiency powder selecting device of the external circulation pulverizer adopts blanking of the blanking ring cavity and is matched with cyclone guiding in the blanking ring cavity, so that the powder to be blanked is divided in layers, fine powder falls into the classification area around the material guiding cylinder at the inner layer, coarse powder falls into the coarse powder discharging hopper along the shell at the outer layer, the concentration degree of the fine powder is improved at the classification area, the classification effect is improved, the situation that qualified powder and coarse powder are mixed in the classification area in the prior art is avoided, the reflux of the qualified powder is reduced, and the classification efficiency is improved.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is a top view of the embodiment of fig. 1.
Drawing number identification: 1. a classifier; 2. a housing; 3. a return air box; 4. a coarse powder discharge hopper; 5. a qualified powder outlet pipe; 6. an impeller assembly; 7. a powder outlet cylinder; 8. an upper cover; 9. a guide cylinder; 10. a powder inlet pipe; 11. air supplementing pipes; 12. a blanking ring cavity; 13. pulley transmission pair; 14. a motor; 15. an air duct.
Detailed Description
The technical scheme of the invention is further described below with reference to the embodiment shown in the drawings.
The invention relates to a high-efficiency powder selecting device of an external circulation pulverizer, which comprises a classifier 1, a return air box 3 and a coarse powder discharge hopper 4.
The classifier 1 comprises a shell 2, an impeller assembly 6, a powder outlet cylinder 7 and a motor 14, wherein the shell 2 comprises an upper outer cone (with a small upper part and a big lower part) which are coaxially connected, the outer cone in the middle part and the outer cone in the lower part (with a big upper part and a small lower part) are covered on the top of the upper outer cone, the powder outlet cylinder 7 is coaxially arranged on the top of the upper cover 8 with a central hole of the upper cover 8, the impeller assembly 6 is coaxially arranged on the bottom of the upper cover 8 with a central hole of the upper cover 8, a qualified powder outlet pipe 5 is arranged on a left cylinder of the powder outlet cylinder 7, the motor 14 and the qualified powder outlet pipe 5 are oppositely arranged on the powder outlet cylinder 7, and the motor 14 is connected with a rotating shaft (extending into the powder outlet cylinder 7) of the impeller assembly 6 through a belt pulley transmission pair 13; the upper covers 8 in front and behind the powder outlet cylinder 7 are provided with powder inlets, and each powder inlet is vertically communicated with a powder inlet pipe 10, as shown in fig. 1 and 2.
The upper outer cone and the middle outer column of the shell 2 are internally provided with a conical guide cylinder 9 (small at the upper part and large at the lower part) which is arranged at the bottom of the upper cover 8 and surrounds the impeller assembly 6, the bottom of the guide cylinder 9 is basically flush with the bottom of the middle outer column, a blanking annular cavity 12 is formed between the guide cylinder 9 and the upper outer cone and the middle outer column, and an upper cavity opening of the blanking annular cavity 12 is communicated with the front powder inlet pipe 10 and the rear powder inlet pipe 10; front and rear air inlets are respectively formed in the upper outer cone corresponding to the front and rear powder inlet pipes 10, each air inlet is communicated with an air supplementing pipe 11, the air inlet direction of each air supplementing pipe 11 is tangential to the upper outer cone, and the front and rear air supplementing pipes 11 are communicated with air supply pipes of the system to form wind power cyclone in the blanking annular cavity 12, as shown in fig. 1 and 2.
The bottom of return air case 3 (intercommunication is on the air supply pipeline of system) is offered coaxial blanking hole, the top feed inlet of coarse powder play hopper 4 install in the bottom of return air case 3 and with blanking hole intercommunication, coaxial air outlet has been offered at the top of return air case 3, the bottom play powder mouth of the lower part outer cone of casing 2 is installed at return air case 3 top and is communicated with the air outlet, and the intercommunication position of lower part outer cone and return air case 3 is equipped with air duct 15, and air duct 15 in the return air case 3 is coaxial cone (big end down), and air duct 15 in the lower part outer cone is coaxial cylinder, the top of cylinder is sealed, as shown in fig. 1, fig. 2.
The operation mode of the invention is as follows:
1. powder entering the blanking ring cavity 12 from the powder inlet pipe 10 of the upper cover 8 falls down while rotating under the cyclone action in the blanking ring cavity 12, coarse powder gradually runs to the outer layer due to the weight of the coarse powder under the centrifugal force action, fine powder runs to the inner layer due to the light weight, the powder discharged from the lower cavity opening of the blanking ring cavity 12 is obviously layered in the radial direction, the inner layer powder close to the lower opening of the guide cylinder 9 is mainly fine powder, and the outer layer powder close to the shell 2, namely far away from the lower opening of the guide cylinder 9 is mainly coarse powder.
2. The fine powder is lifted up under the action of wind power of the return air box 3 and negative pressure of the system and directly enters a classification area (inside the guide cylinder 9), under the classification action of the running impeller assembly 6, qualified powder (fine powder meeting the mesh number requirement) enters a collector from a qualified powder outlet pipe 5 of the classifier 1, and the trend of the fine powder is as shown in a line A in fig. 1.
3. The unqualified powder (coarse powder) falls down along the lower outer cone of the shell 2, the coarse powder enters the coarse powder discharge hopper 4 through the air return box 3 and returns to the grinding machine from the coarse powder discharge hopper 4 for re-grinding, and the coarse powder moves to a line B in figure 1.
By adopting the technology of the invention, the powder entering the classifying area is not coarse powder and fine powder mixed in the traditional technology, but qualified powder with the content of most of fine powder, even if the falling fine powder does not directly enter the classifying area, the falling fine powder can be blown upwards by the wind power between the outer cone of the lower part of the shell 2 and the air duct 15 to enter the classifying area, and the condition that the fine powder is re-milled along with the coarse powder flowing back to the grinding host machine is basically avoided.
Claims (4)
1. The utility model provides an outer circulation milling machine high efficiency selects powder ware, includes grader (1), its characterized in that:
the lower opening of a shell (2) of the classifier (1) is arranged at the upper opening of a coarse powder discharge hopper (4) through a return air box (3), and the return air box (3) is communicated with a supply air pipeline of the system through an air inlet pipe; the powder inlet pipe (10) of the classifier (1) is arranged on the upper cover (8) of the shell (2), the qualified powder outlet pipe (5) of the classifier (1) is arranged on the powder outlet cylinder (7) above the impeller assembly (6), the bottom of the upper cover (8) is provided with a guide cylinder (9) covering the impeller assembly (6), a blanking annular cavity (12) is formed between the guide cylinder (9) and the shell (2), the upper opening of the blanking annular cavity (12) is communicated with the powder inlet pipe (10), the air supplementing pipe (11) is tangentially communicated with the shell (2) corresponding to the blanking annular cavity (12), and the air supplementing pipe (11) is communicated with the air supply pipeline to form a cyclone in the blanking annular cavity (12);
the guide cylinder (9) is an inner cone with a small upper part and a large lower part, the upper part of the shell (2) is an outer cone with a small upper part and a large lower part, and the lower part of the shell (2) is an outer cone with a large upper part and a small lower part;
the classifier (1) operates in the following manner:
(1) powder entering the blanking annular cavity (12) from the powder inlet pipe (10) of the upper cover (8) falls down under the cyclone action in the blanking annular cavity (12) while rotating, coarse powder gradually moves to the outer layer due to weight under the centrifugal force, fine powder moves to the inner layer due to weight, the powder discharged from the lower cavity opening of the blanking annular cavity (12) is obviously layered in the radial direction, the inner layer powder close to the lower opening of the guide cylinder (9) is fine powder, and the outer layer powder close to the shell (2) and far away from the lower opening of the guide cylinder (9) is coarse powder;
(2) the fine powder is lifted up under the action of wind power of a return air box (3) and negative pressure of a system and directly enters a guide cylinder (9), and under the grading action of an operating impeller assembly (6), the fine powder enters a collector from a qualified powder outlet pipe (5) of the grader (1);
(3) the coarse powder falls down along the lower outer cone of the shell (2), enters the coarse powder discharge hopper (4) through the air return box (3) and is returned to the grinding main machine from the coarse powder discharge hopper (4) for re-grinding.
2. The efficient powder selector of the external circulation pulverizer of claim 1, wherein: the installation part of the shell (2) and the return air box (3) is provided with an air duct (15) for reducing the air inlet area and improving the air speed.
3. The efficient powder selector of the external circulation pulverizer as set forth in claim 2, wherein: the air duct (15) in the air return box (3) is conical, the upper part of which is small and the lower part of which is large, and the air duct (15) in the shell (2) is cylindrical.
4. The efficient powder selector of the external circulation pulverizer of any one of claims 1 to 3, wherein: and a motor (14) which drives the impeller assembly (6) to operate through a belt pulley transmission pair (13) is arranged on the powder outlet cylinder (7) opposite to the qualified powder outlet pipe (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910064611.5A CN109622252B (en) | 2019-01-23 | 2019-01-23 | High-efficiency powder selector of external circulation pulverizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910064611.5A CN109622252B (en) | 2019-01-23 | 2019-01-23 | High-efficiency powder selector of external circulation pulverizer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109622252A CN109622252A (en) | 2019-04-16 |
| CN109622252B true CN109622252B (en) | 2024-03-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910064611.5A Active CN109622252B (en) | 2019-01-23 | 2019-01-23 | High-efficiency powder selector of external circulation pulverizer |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7327003B2 (en) * | 2019-08-30 | 2023-08-16 | 株式会社プロテリアル | Cyclone collection device, rare earth magnet alloy crushing system, and method for producing RTB sintered magnet |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN109622252A (en) | 2019-04-16 |
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