CN213494068U

CN213494068U - Vertical sand mill of dual cycle

Info

Publication number: CN213494068U
Application number: CN202022097875.1U
Authority: CN
Inventors: 陈湘; 陈丹
Original assignee: Hubei University of Science and Technology
Current assignee: Hubei University of Science and Technology
Priority date: 2020-09-22
Filing date: 2020-09-22
Publication date: 2021-06-22
Anticipated expiration: 2030-09-22

Abstract

The utility model provides a vertical sand mill of dual cycle belongs to chemical industry equipment technical field. Including the ground paste bucket with rotate the (mixing) shaft of connection on the ground paste bucket, (mixing) shaft external fixation is provided with spiral helicine stock guide, the stock guide is provided with the stock guide outer fringe fixed guide that links to each other outward, the middle part of stock guide has the graticule mesh that can separate and keep off grinding medium, the inner wall of ground paste bucket is equipped with spiral helicine backward flow baffle, the screw direction of backward flow baffle is opposite with the screw direction of stock guide, the top of ground paste bucket is provided with the pan feeding pipe, the bottom of ground paste bucket is provided with the medium discharging pipe, a relief hole has been seted up to the lower extreme of (mixing) shaft, separate through a filter screen between relief hole and the ground paste bucket inner chamber, the clearance that allows grinding medium. The utility model has the advantages of can slow down grinding medium's wearing and tearing etc.

Description

Vertical sand mill of dual cycle

Technical Field

The utility model belongs to the technical field of chemical industry equipment, a vertical sand mill of dual cycle is related to.

Background

The production process of chemical products such as paint and the like needs a sand mill, which is equipment for grinding slurry by a grinding medium to enable the slurry to reach the required granularity after grinding. The prior sand mill has the following defects:

1. the grinding medium in the sand mill can the gradual loss diminish in long-term use in-process, consequently, the sand mill need change the processing with the grinding medium in the sand mill after operating certain cycle. If the replacement is not timely, the grinding medium can pass through the screen in the sand mill and enter normal materials, so that the pollution of the materials is caused.

2. The existing sand mill stirs the mixed material through the structures such as rod ingot, convex pin, dispersion disc, etc., thereby utilizing different particle size materials to form turbulent flow under the effect of non-uniform guiding pressure, the flow velocity is different and the grinding to the slurry is realized, obviously, the grinding medium is in and collides with the slurry, there is also violent collision each other between the grinding medium, cause the wearing and tearing aggravation of the grinding medium, the grinding medium powder that the collision produced also causes great influence to the finished product quality.

3. The grinding medium in the existing sand mill (vertical) is in an external circulation mode, so that the equipment is assisted, and the waste of slurry is caused.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a vertical sand mill of dual cycle to the above-mentioned problem that prior art exists, the utility model aims to solve the technical problem how to slow down the wearing and tearing of grinding medium.

The purpose of the utility model can be realized by the following technical proposal: the utility model provides a vertical sand mill of dual cycle, its characterized in that includes the ground paste bucket and rotates the (mixing) shaft of connection on the ground paste bucket, the (mixing) shaft external fixation is provided with spiral helicine stock guide, the stock guide is provided with the guide cylinder that links to each other with the stock guide outer fringe is fixed outward, the middle part of guide cylinder has the graticule mesh that can separate and keep off grinding medium, the inner wall of ground paste bucket is equipped with spiral helicine backward flow baffle, the spiral direction of backward flow baffle is opposite with the spiral direction of stock guide, the top of ground paste bucket is provided with the pan feeding pipe, the bottom of ground paste bucket is provided with the medium discharging pipe, a relief hole has been seted up to the lower extreme of (mixing) shaft, separate through a filter screen between relief hole and the ground paste bucket inner chamber, it allows the clearance that grinding medium.

Furthermore, a driving belt wheel is arranged at the upper end of the stirring shaft.

Furthermore, the backflow guide plates are provided with a plurality of backflow guide plates, and the backflow guide plates are parallel to each other.

The rotation direction of the stirring shaft is the direction of driving the mixed material to enter the top from the bottom of the guide cylinder. The material to be ground continuously enters from the feeding pipe, is discharged from the discharge hole after being ground, and the grinding medium is discharged from the medium discharging pipe in the cleaning process.

Circulation path of grinding media: the grinding medium enters the material guide plate from the bottom of the slurry barrel, runs from bottom to top under the limiting action of the inner wall of the material guide cylinder and the guiding action of the material guide plate, enters the backflow guide plate after being discharged from the tail end of the material guide plate, and returns to the bottom of the slurry barrel from the top of the backflow guide plate.

Circulation path of material to be ground: the grinding medium enters the material guide plate from the bottom of the slurry barrel, the grinding medium runs from bottom to top under the limiting action of the inner wall of the material guide barrel and the guiding action of the material guide plate, most of the refined material enters the reflux guide plate in the middle of the slurry barrel through the grid and then goes up, so that the refined material is sucked into the top of the slurry barrel and enters the next cycle; the material to be ground which is not filtered by the grid or part of the material to be ground which is not filtered by the grid is discharged from the tail end of the material guide plate and then enters the backflow guide plate, and returns to the bottom of the slurry barrel from the top of the backflow guide plate; because the gap at the lower end of the guide cylinder is equivalent to a stirring paddle, the medium to be ground forms a vortex flow with opposite spiral directions at the position and upwards moves on the backflow guide plate, the allowable speed of the medium to be ground is buffered, and the impact of the material to be ground at the position is strong.

Due to different circulation speeds and different circulation paths, the materials to be ground and the grinding media collide for multiple times in one circulation, including grinding in the backflow guide plate, collision grinding at the grid of the guide cylinder, and collision grinding of the grinding media and the materials to be ground which are in a vortex flow outside the guide cylinder after being thrown out from the tail end of the guide plate.

The grinding medium has smooth and continuous circulation path, low probability of mutual collision and low collision strength.

Grind the material to ideal particle size and get into the relief hole by the filter screen of (mixing) shaft lower extreme, owing to be located vortex central point and put, its velocity of flow and pressure are all less, and the material gets into the relief hole gently, and it is well known that the brute force is extruded the material and is led to the filter screen, not only causes the filter screen to block up easily, can lead to the inhomogeneous of discharged material particle size moreover.

Drawings

FIG. 1 is a schematic view of the structure of the present sander.

In the figure, 1, a slurry barrel; 2. a stirring shaft; 3. a material guide plate; 4. a material guide cylinder; 5. grid forming; 6. a reflux guide plate; 7. a feeding pipe; 8. a medium discharge pipe; 9. a discharge hole; 10. filtering with a screen; 11. a drive pulley.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

As shown in fig. 1, the slurry mixing device comprises a slurry barrel 1 and a mixing shaft 2 rotatably connected to the slurry barrel 1, a spiral guide plate 3 is fixedly arranged outside the mixing shaft 2, a guide cylinder 4 fixedly connected to the outer edge of the guide plate 3 is arranged outside the guide plate 3, a grid 5 capable of separating and blocking grinding media is arranged in the middle of the guide cylinder 4, a spiral backflow guide plate 6 is arranged on the inner wall of the slurry barrel 1, the spiral direction of the backflow guide plate 6 is opposite to the spiral direction of the guide plate 3, a feeding pipe 7 is arranged at the top of the slurry barrel 1, a medium discharging pipe 8 is arranged at the bottom of the slurry barrel 1, a discharging hole 9 is formed at the lower end of the mixing shaft 2, the discharging hole 9 is separated from the inner cavity of the slurry barrel 1 by a filter screen 10, and a gap allowing the grinding media to pass through is formed between.

The upper end of the stirring shaft 2 is provided with a driving belt wheel 11. The reflux guide plates 6 are provided with a plurality of strips, and all the reflux guide plates 6 are parallel to each other.

The rotation direction of the stirring shaft 2 is the direction of driving the mixed material to enter the top from the bottom of the material guide cylinder 4. The material to be ground continuously enters from the feeding pipe 7, is discharged from the discharge hole 9 after being ground, and the grinding medium is discharged from the medium discharge pipe 8 in the cleaning process.

Circulation path of grinding media: the grinding medium enters the material guide plate 3 from the bottom of the slurry barrel 1, runs from bottom to top under the limiting action of the inner wall of the material guide barrel 4 and the guiding action of the material guide plate 3, enters the backflow guide plate 6 after being discharged from the tail end of the material guide plate 3, and returns to the bottom of the slurry barrel 1 from the top of the backflow guide plate 6.

Circulation path of material to be ground: the grinding medium enters the material guide plate 3 from the bottom of the slurry barrel 1, the grinding medium runs from bottom to top under the limiting action of the inner wall of the material guide cylinder 4 and the guiding action of the material guide plate 3, and most of the refined material enters the reflux guide plate 6 in the middle of the slurry barrel 1 through the grid 5 and then enters the next cycle after being sucked into the top of the slurry barrel 1; the materials to be ground which are not filtered by the grid 5 or partially not filtered by the grid 5 enter the backflow guide plate 6 after being discharged from the tail end of the material guide plate 3, and return to the bottom of the slurry barrel 1 from the top of the backflow guide plate 6; because the gap at the lower end of the guide cylinder 4 is equivalent to a stirring paddle, the medium to be ground forms a vortex with opposite spiral directions at the position and upwards moves on the backflow guide plate 6, the allowable speed of the grinding medium is buffered, and the impact of the material to be ground at the position is strong.

Due to different circulation speeds and different circulation paths, the materials to be ground and the grinding media collide for multiple times in one circulation, including grinding in the backflow guide plate 6, collision grinding at the grid 5 of the guide cylinder 4, and collision grinding between the grinding media thrown out from the tail end of the guide plate 3 and the materials to be ground in a vortex outside the guide cylinder 4.

The material that grinds to ideal particle diameter gets into relief hole 9 by filter screen 10 of (mixing) shaft 2 lower extreme, because be located vortex central point and put, its velocity of flow and pressure are all less, and the material gets into relief hole 9 gently, and as is known, the brute force is extruded the material and is led to filter screen 10, not only causes filter screen 10 to block up easily, can lead to the inhomogeneous of discharged material particle diameter moreover.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims

1. The double-circulation vertical sand mill is characterized by comprising a slurry barrel (1) and a stirring shaft (2) which is rotatably connected to the slurry barrel (1), wherein a spiral guide plate (3) is fixedly arranged outside the stirring shaft (2), a guide cylinder (4) fixedly connected with the outer edge of the guide plate (3) is arranged outside the guide plate (3), the middle part of the guide cylinder (4) is provided with a grid (5) capable of separating and blocking grinding media, the inner wall of the slurry barrel (1) is provided with a spiral backflow guide plate (6), the spiral direction of the backflow guide plate (6) is opposite to that of the guide plate (3), the top of the slurry barrel (1) is provided with a feeding pipe (7), the bottom of the slurry barrel (1) is provided with a medium discharging pipe (8), the lower end of the stirring shaft (2) is provided with a discharge hole (9), and the discharge hole (9) is separated from the inner cavity of the slurry barrel (1) through a filter screen (10), and a gap allowing grinding media to pass through is formed between the guide cylinder (4) and the inner edge of the backflow guide plate (6).

2. A double-circulation vertical sand mill according to claim 1, characterized in that the upper end of the stirring axle (2) is provided with a driving pulley (11).

3. A double-circulation vertical sand mill according to claim 1 or 2, characterized in that the return flow guide (6) is provided in a plurality of strips, the return flow guide (6) being parallel to each other.