CN105817413B

CN105817413B - Powder screening device

Info

Publication number: CN105817413B
Application number: CN201610367977.6A
Authority: CN
Inventors: 杨建顺; 杨建林
Original assignee: Anhui Yangliuqing Calcium Industry Technology Co ltd
Current assignee: Anhui Yangliuqing Calcium Industry Technology Co ltd
Priority date: 2016-05-24
Filing date: 2016-05-24
Publication date: 2020-07-07
Anticipated expiration: 2036-05-24
Also published as: CN105817413A

Abstract

The invention relates to the technical field of powder processing, and particularly discloses a powder screening device which comprises a cylindrical shell, wherein a cylindrical screen unit which is arranged in a concentric manner is rotatably arranged in the shell through a bearing, the top parts of the shell and the screen unit are correspondingly provided with feed inlets for powder to fall into the screen unit, the bottom part of the shell and the lower end corresponding to the screen unit are provided with large powder outlets, the edge of the bottom part of the shell is provided with small powder outlets, a rotating shaft is arranged in the screen unit along the length direction of a cylinder, and the rotating shaft drives the screening unit to synchronously rotate. During the use, the tiny particle calcium carbonate powder in the screen mesh unit is naturally thrown to the shell cavity between the screen mesh unit and the shell through the mesh opening, so that the tiny particle calcium carbonate powder reaches the tiny powder outlet to be discharged in continuous movement, meanwhile, the large particle calcium carbonate powder in the screen mesh unit is intercepted by the mesh opening, finally falls into the bottom of the shell and is discharged from the large powder outlet, and therefore the calcium carbonate powder is screened. The invention has simple structure and high screening efficiency.

Description

Powder screening device

Technical Field

The invention relates to the technical field of powder processing, in particular to a powder screening device

Background

At present, the light calcium carbonate is widely applied to the industries of rubber, plastics, printing ink, coating, sealant and adhesive, and can effectively improve the performances of rheological property, bending strength and the like of products. In the prior art, the main production process flow of the light calcium carbonate is as follows: calcining limestone to generate lime → adding water to digest to generate calcium hydroxide emulsion → adding carbon dioxide gas to carbonize into light calcium carbonate emulsion → dehydrating by plate frame to form filter cake → drying and crushing → sieving and packaging. In the actual sieving process, the light calcium carbonate powder has ultrahigh surface performance and is in a polar state, so the light calcium carbonate powder is easy to agglomerate in the sieving process, thereby bringing difficulty to production and processing.

Disclosure of Invention

The invention aims to provide a powder screening device which is simple in structure and high in screening efficiency.

In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a screening plant of powder which characterized in that: including the casing of tube-shape, rotate through the bearing in the casing and be provided with the tube-shape screen cloth unit that arranges with the core, the top correspondence of casing and screen cloth unit is seted up and is supplied the powder to fall into the feed inlet in the screen cloth unit, and the bottom of casing, the lower extreme that corresponds the screen cloth unit have seted up the export of big powder, and the bottom edge of casing has seted up the export of little powder, be provided with the pivot along the tube length direction in the screen cloth unit, the pivot drives the synchronous rotation of screening unit.

The beneficial effect that adopts above-mentioned technical scheme to produce lies in: during the use, drop into the tube-shape screen cloth unit with calcium carbonate powder from the feed inlet in, the pivot drives screen cloth unit synchronous rotation in-process like this, and the tiny particle calcium carbonate powder in the screen cloth unit is got rid of to the shell intracavity between screen cloth unit and casing through the mesh hole naturally to reach the tiny powder export in continuous removal and discharge, and meanwhile, the large granule calcium carbonate powder in the screen cloth unit is held back by the mesh, finally falls into the bottom of casing and discharges from the big powder export, so realized the screening of calcium carbonate powder promptly. The invention has simple structure, can effectively avoid the agglomeration of calcium carbonate powder and has high screening efficiency.

Drawings

FIG. 1 is a schematic structural view of the present invention;

fig. 2 is a sectional view taken along line a-a of fig. 1.

Detailed Description

A powder screening device comprises a cylindrical shell 10, wherein a cylindrical screen unit which is arranged in a concentric manner is rotatably arranged in the shell 10 through a bearing, a feed inlet 11 for powder to fall into the screen unit is correspondingly formed in the tops of the shell 10 and the screen unit, a large powder outlet 12 is formed in the bottom of the shell 10 and the lower end corresponding to the screen unit, a small powder outlet 13 is formed in the edge of the bottom of the shell 10, a rotating shaft 20 is arranged in the screen unit along the cylinder length direction, and the rotating shaft 20 drives the screen unit to synchronously rotate. When the calcium carbonate powder screening device is used, calcium carbonate powder is thrown into the cylindrical screen unit from the feeding hole 11, the rotating shaft 20 drives the screen unit to rotate synchronously, small calcium carbonate powder in the screen unit is naturally thrown into a shell cavity between the screen unit and the shell 10 through meshes, and then reaches the small powder outlet 13 to be discharged in continuous movement, meanwhile, large calcium carbonate powder in the screen unit is intercepted by the meshes and finally falls into the bottom of the shell 10 and is discharged from the large powder outlet 12, and therefore calcium carbonate powder screening is achieved. To ensure reliable dosing, an upwardly extending annular shroud is provided at the top of the housing 10, as shown in figure 1, to allow material to be spilled out of the housing during dosing. The invention has simple structure, and implements screening work by a rotating separation mode, thus effectively avoiding the agglomeration of calcium carbonate powder and having high screening efficiency.

As a further preferable scheme, as shown in fig. 1-2, two small powder outlets 13 are adjacently arranged at the bottom edge of the casing 10. When the powder discharging device is used, along with the action of wind force generated by the rotation of the screen unit, small particle powder in a shell cavity between the screen unit and the shell 10 is in a rotating movement state until the small particle powder reaches the small powder outlet 13 and is discharged. However, in the actual discharging process, some small powder particles reaching the small powder outlet 13 are directly discharged, and some small powder particles continue to rotate for many times in the annular region to be discharged due to the influence of wind power, that is, all the screened small powder particles are not discharged in time. Therefore, two small powder outlets 13 are adjacently arranged, so that even if small powder is not discharged from the first small powder outlet 13, the moving speed of the small powder can be moderately reduced under the influence of the wind pressure at the first small powder outlet 13, and the small powder can be smoothly discharged from the next adjacent small powder outlet 13, so that the small powder in the annular area can be timely discharged, the problem that materials in the screen unit cannot be smoothly screened due to the accumulation of the small powder is avoided, and the continuous screening work is ensured. The applicant proves through experiments that the yield of the small-particle calcium carbonate powder is 5 tons/hour when a single small powder outlet 13 is arranged and the yield of the small-particle calcium carbonate powder is 14-18 tons/hour when two small powder outlets 13 are adjacently arranged under the condition that other equipment conditions are not changed, such as the shape and the size are the same and the power and the rotating speed of the motor are the same.

The specific scheme is that as shown in fig. 1-2, the screen unit comprises vane plates 50 arranged at intervals, each vane plate 50 is enclosed to form a cylinder, the upper end and the lower end of each vane plate 50 are fixed through a support respectively, a cylindrical wire netting 30 is arranged on the periphery of the cylinder wall formed by enclosing each vane plate 50, and a cylindrical screen 40 convenient to detach is fixed on the periphery of the wire netting 30. The vane plates 50 arranged at intervals in the circumferential direction play a role in primarily separating materials, and simultaneously can ensure the rigidity strength required by the rotation of the screen unit, and in addition, the fixed screen 40 can be conveniently supported through the arrangement of the wire netting 30.

Preferably, as shown in fig. 1 and 2, the plate surface of each vane plate 50 is located in the radial direction of the screen unit, so that the space area between adjacent vane plates 50 is large to provide the largest moving passage for the small particle powder in the screen unit.

Further, the middle section of the vane plate 50 is provided with an annular reinforcing plate 51, the plate body of the annular reinforcing plate 51 is arranged through the plate surface of each vane plate 51, and the central core of the annular reinforcing plate 51 coincides with the axial core of the screen unit. Because the extrusion force of the calcium carbonate powder body that drops into in to the screen cloth unit is great to bladed plate 50, if the material that drops into can't obtain timely screening separation, can cause bladed plate 50 compressive deformation undoubtedly, consequently arrange annular reinforcing plate 51, can fix each bladed plate 50 effectively like this, avoid being close to each other or separating between bladed plate 50, bladed plate 50 takes place the phenomenon of deformation and takes place, and then guarantee the normal passing through of powder and screen cloth unit's safety, stable rotation. Of course, in actual machining, a plurality of annular reinforcing plates 51 may be arranged at appropriate vertical intervals according to the length of the vane plate 50. It should be noted that, the arrangement of the two small powder outlets 13 in the present application effectively ensures that the sieved small powder particles can be discharged in time, and thus, the occurrence of the situation that the vane plate 50 is deformed due to pressure is also avoided.

Preferably, annular reinforcing plates 51 are respectively arranged at the inner side and the outer side of the blade plate 50, the two annular reinforcing plates 51 are consistent in height, the plate surface of each annular reinforcing plate 51 is perpendicular to the shaft core of the screen unit, the fixing effect of the blade plate 50 can be further improved, and meanwhile, the influence of the plate surface arrangement mode of each annular reinforcing plate 51 on the sieving of the material is also very small.

In addition, in order to facilitate the disassembly and assembly of the screen 40, as shown in fig. 1 and 2, the mounting door 14 penetrating through the wall of the casing 10 and facilitating the disassembly and assembly of the screen 40 is arranged on the wall of the casing 10 at intervals, a door cover 60 facilitating the disassembly and assembly is arranged at the mounting door 14, and the cover surface of the door cover 60 is matched with the inner frame surface of the mounting door 14. That is to say, the door cover closes the installation door 14 in the using state to avoid the powder therein to leak, and when the screen 40 needs to be replaced, the door cover can be opened, and then the screen 40 is replaced at the installation door 14, which is very convenient, and the installation and arrangement of the specific door cover can be implemented in various ways, such as the bolt and the jack matching way shown in fig. 1-2, which is very convenient.

Specifically, the screen 40 is a 1200 mesh screen, and the size of the screen can meet the screening requirement of calcium carbonate.

Claims

1. The utility model provides a screening plant of powder which characterized in that: the powder screening device comprises a cylindrical shell (10), wherein a cylindrical screen unit which is arranged in a same core mode is rotatably arranged in the shell (10) through a bearing, a feeding hole (11) for powder to fall into the screen unit is correspondingly formed in the top of the shell (10) and the top of the screen unit, a large powder outlet (12) is formed in the bottom of the shell (10) and the lower end of the screen unit, a small powder outlet (13) is formed in the edge of the bottom of the side wall of the shell (10), a rotating shaft (20) is arranged in the screen unit along the cylinder length direction, and the rotating shaft (20) drives the screening unit to rotate synchronously; the screen unit comprises blade plates (50) which are arranged at intervals, and the upper end and the lower end of each blade plate (50) are fixed through a support respectively.

2. A powder screening apparatus as claimed in claim 1, wherein: two small powder outlets (13) are adjacently arranged at the bottom edge of the shell (10).

3. A powder screening apparatus as claimed in claim 2, wherein: the periphery of the wall of the cylinder formed by enclosing the vane plates (50) is provided with a cylindrical wire mesh (30), and the periphery of the wire mesh (30) is fixed with a cylindrical screen (40) convenient to detach.

4. A powder screening apparatus as claimed in claim 3, wherein: the plate surface of each vane plate (50) is located in the radial direction of the screen unit.

5. A powder screening device according to claim 4, wherein: an annular reinforcing plate (51) is arranged in the middle section of each blade plate (50), the plate body of each annular reinforcing plate (51) penetrates through the plate surface of each blade plate (51) to be arranged, and the center core of each annular reinforcing plate (51) is overlapped with the shaft core of the screen unit.

6. A powder screening device according to claim 5, wherein: annular reinforcing plates (51) are respectively arranged at the inner side and the outer side of the blade plate (50), the heights of the two annular reinforcing plates (51) are consistent, and the plate surfaces of the annular reinforcing plates (51) are perpendicular to the shaft core of the screen unit.

7. A powder screening device according to claim 3, 4 or 5, wherein: the screen cloth mounting structure is characterized in that mounting doors (14) penetrating through the wall of the casing (10) and facilitating disassembly and assembly of the screen cloth (40) are arranged on the wall of the casing at intervals, door covers (60) facilitating disassembly and assembly are arranged at the positions of the mounting doors (14), and the cover surfaces of the door covers (60) are matched with the inner frame surface of the mounting doors (14).

8. A powder screening device according to claim 6, wherein: the screen mesh is a 1200 mesh screen.