CN212041339U

CN212041339U - Roller screen crushing device and roller screen crushing system for pellet screening

Info

Publication number: CN212041339U
Application number: CN202020537197.3U
Authority: CN
Inventors: 李铁辉
Original assignee: Zhongye Changtian International Engineering Co Ltd
Current assignee: Zhongye Changtian International Engineering Co Ltd
Priority date: 2020-04-13
Filing date: 2020-04-13
Publication date: 2020-12-01
Anticipated expiration: 2030-04-13

Abstract

The utility model discloses a roller screen breaker and roller screen crushing system for pelletizing screening. Roller screen breaker includes: the roller screen assembly comprises a fine screen roller screen section, a wide screen roller screen section and at least one press roller which are sequentially arranged in the same plane, wherein the at least one press roller is arranged at the terminal end of the conveying direction of the roller screen assembly, the roller screen assembly is obliquely arranged relative to the horizontal plane, and the height of the starting point end of the conveying direction of the roller screen assembly is higher than that of the terminal end; the fine material chute is arranged below the screen section of the fine screen roller; the medium material chute is arranged below the wide screen roller screen section; and the large material chute is arranged below the compression roller. Thereby realizing the functions of particle size screening and large block crushing on one roller screen device; simultaneously, respectively conveying different particle sizes; has the advantages of complex functions, low cost and small occupied area.

Description

Roller screen crushing device and roller screen crushing system for pellet screening

Technical Field

The utility model relates to the field of mechanical equipment, especially, relate to a roll screen breaker and roll screen crushing system that is used for green ball screening of pelletizing.

Background

In the production of metallurgical industry, the production of pellets is an important component in steel plants, and pelletizing is an important process in the production process of pellets. The quality of green pellets greatly affects the quality of finished pellets. For example, the size, moisture, mechanical strength, thermal stability, and chemical composition of green pellets can be varied to significantly affect the subsequent consolidation process. The quality of the green ball itself is not only related to the process engineering, but also depends on the physicochemical properties of the raw materials and the preparation method. In order to improve the yield and the quality of products, the pellets need to be screened, the unqualified size fraction entering the next procedure is reduced, and the roller screen type device is adopted for screening, so that the purpose is achieved. Also, in other industries, it is often necessary to screen different types or grades of products and product materials.

The traditional roller screen is limited by the structure, and can only screen two types of particle sizes according to the size of a gap, wherein materials larger than the gap pass through the screen surface, and materials smaller than the gap leak from the gap of the screen surface. Generally, the manufactured pellets are firstly screened by a large-pellet roller screen, the pellets with oversize size fraction on the screen are transported to a crusher to be crushed and then transported to a pelletizing system to be pelletized again, the pellets under the screen are transported to a small-pellet roller screen to be screened by a wide belt, the pellets with qualified size fraction on the screen are transported to the next procedure, and the materials under the screen are transported to the pelletizing system to be pelletized again. The traditional roller screen has single function, needs two roller screens to be matched for use, and has large equipment investment and large occupied area.

Taking a pellet sieve of a disc pelletizer in the steel industry as an example, the disc pelletizer is pelletizing equipment widely adopted by a pellet mill. The main components are inclined steel discs with peripheries, when the discs rotate around a central shaft (or central line), the balling materials roll down along the disc bottom, and the fine-grained materials are scattered on the surface of the wet cue ball, so that the cue ball continuously grows to a specified size. The disc pelletizer has the working characteristics that: the material can be made to move regularly, so that the larger spherulites and the smaller spherulites can respectively move along different tracks, and therefore the spherulites can be classified according to the size, and the size of the green pellets determines the productivity of the pelletizer and the quality of the pellets to a great extent. At present, most pellet factories require to manufacture finished pellet ores with the diameter of 8-16mm for use by blast furnaces, and the small or too small size of green pellets affects the compression strength and the falling strength of the green pellets, and further affects the quality indexes of finished pellets, such as cold strength, reducibility and porosity.

As shown in fig. 1, in the prior art, a plurality of disk pelletizer 11 carries out pelletizing to discharge raw pellets, the raw pellets are wrapped by large blocks and powder and are transported to a pendulum distributor 13 in a centralized manner by a belt conveyor 12, the head of the pendulum distributor 13 swings to feed the raw pellets to a large pellet roller screen 14, the large blocks on the screen fall onto a return belt conveyor 18, the qualified raw pellets and the powder under the screen pass through a wide belt distributor 15 to a roller screening distributor 16, and then pass through a screening process, the qualified raw pellets on the screen are distributed to a chain grate 17, and the powder under the screen also falls onto the return belt conveyor 18 to return to the pelletizer, thereby completing the screening and distributing operation of the raw pellets.

Because the green pellets manufactured by all the disk pelletizer 11 are screened in a centralized way, the screening amount is large, the green pellets have large moisture and low screening efficiency, and powder and large lumps still exist after screening, thereby affecting the quality of finished pellet ore. If the screened large blocks are not broken, the large blocks are wet and easy to stick, on one hand, the large blocks easily block a hopper chute, and on the other hand, the large blocks can cause the disc sticking of the disc pelletizer after returning to the disc pelletizer through a belt conveyor, so that the production rate and the pelletizing rate of the disc pelletizer are influenced. Screening equipment is in the chain grate machine room, and the returning charge transports from the chain grate machine room and returns to the room of making the ball and makes the ball, and the transportation route is far away, and big ball screening and powder screening adopt two equipment moreover, and equipment specification is also big, has increased the equipment investment.

Therefore, a new roller screen crushing device and a new roller screen crushing system need to be designed to solve the technical problems.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a main aim at provides a roll screen breaker and roll screen crushing system that is used for green ball screening of pelletizing, aims at solving current roll screen device function singleness, with high costs, the big technical problem of occupation of land.

In order to realize the above-mentioned purpose, the utility model provides a roller screen breaker for pelletizing screening includes:

the roller screen assembly comprises a fine screen roller screen section, a wide screen roller screen section and at least one press roller which are sequentially arranged in the same plane, wherein the at least one press roller is arranged at the terminal end of the conveying direction of the roller screen assembly, the roller screen assembly is obliquely arranged relative to the horizontal plane, and the height of the starting end of the conveying direction of the roller screen assembly is higher than that of the terminal end;

the fine material chute is arranged below the screen section of the fine screen roller;

the medium material chute is arranged below the wide screen roller screen section;

and the large material chute is arranged below the compression roller.

Further, the inclination angle of the roller screen assembly relative to the horizontal plane is 12-15 degrees.

Further, the rollers of the fine screen roller screen section, the rollers of the wide screen roller screen section and the rollers of the at least one press roller are driven by independent motors.

Furthermore, the number of the press rolls is two, and the rotating directions of the rollers of the press rolls are opposite to the rotating directions of the rollers of the fine screen roller screen section and the rollers of the wide screen roller screen section.

Further, the distance between the rollers of the fine screen roller screen section is adjustably set; the distance between the rollers of the wide screen roller screen section is adjustably set.

Further, the distance between the rollers of the screen section of the fine screen roller is 7-9 mm; the distance between the rollers of the wide screen roller section is 14-18 mm; the tightening angle of the chute of the medium material chute is more than or equal to 70 degrees.

The utility model discloses still a broken system of roll screen for pelletizing screening, include:

the receiving disc is arranged below a pelletizing disc of the disc pelletizer and comprises a bottom surface and two side walls vertically arranged on the bottom surface, the height of each side wall is higher than that of the pelletizing disc, and the two side walls and the bottom surface surround to form a through groove structure with the width reduced, wherein the width of a feed inlet of the receiving disc is larger than that of a discharge outlet of the receiving disc;

the roller screen crushing device is arranged below the receiving disc;

the first conveying belt is arranged below a middle material chute of the roller screen crushing device;

and the second conveying belts are arranged below the fine material chute and the large material chute.

Furthermore, the bottom surface of the receiving disc is bent towards one side of the discharge hole; the lateral wall from connect one side of material mouthful to one side of discharge gate is the arc and extends or buckle.

Furthermore, the number of the disc pelletizer is multiple, and the receiving discs, the roller screen crushing devices and the first conveying belts are arranged in a manner of matching with the disc pelletizer; the roller screen crushing system further comprises a third conveying belt arranged below the plurality of first conveying belts and used for receiving the conveyed pellets of the plurality of first conveying belts and conveying the pellets to a subsequent processing device.

Further, the material distributor is arranged in the direction of the terminal end of the third conveying belt.

Further, the material returning system is used for conveying the screened materials conveyed by the second conveying belt to the disc pelletizer to be pelletized again

According to the scheme, the functions of particle size screening and large block crushing are achieved on one roller screen device by arranging the fine screen roller screen section, the wide screen roller screen section and at least one press roller in a sectional manner; meanwhile, a fine material chute, a medium material chute and a large material chute are respectively arranged below the fine screen roller screen section, the wide screen roller screen section and the at least one press roller, and different particle sizes are respectively conveyed. The roller screen crushing device has the advantages of complex functions, low cost and small occupied area.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic diagram of a prior art system configuration for a roller screen system for a pan pelletizer;

FIG. 2 is a schematic view of the process flow of the roller screen crushing system of the present invention;

FIG. 3 is a schematic structural view of the roller screen crushing system of the present invention;

FIG. 4 is a schematic view of the roller screen crushing apparatus of FIG. 3;

FIG. 5 is a schematic view of the roller screen assembly of the roller screen crushing apparatus of FIG. 4;

FIG. 6 is a schematic diagram of the construction of an end press roll of the roll screen assembly of FIG. 5;

fig. 7 is a schematic structural diagram of the disk pelletizer and the material receiving tray of the present invention.

The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.

In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit ly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

Referring to fig. 2-7, the present invention provides a roller screen crusher 20 and a roller screen crushing system (not numbered) for pellet screening.

The roller screen crushing device 20 is arranged below the disc pelletizer 21, pellets output by the disc pelletizer 21 are screened, then qualified pellets or green pellets are conveyed to the subsequent processing device through the first conveying belt 221, pellets with undersize particle diameter or green pellets are conveyed back to the disc pelletizer 21 through the second conveying belt 28, and pellets with oversized particle diameter or green pellets are conveyed back to the disc pelletizer 21 through the second conveying belt 28 after being crushed by the roller screen crushing device 20.

Specifically, the roller screen crushing device 20 includes a roller screen assembly 204, a fine chute 201, a medium chute 202, and a large chute 203.

The roller screen assembly 204 comprises a fine screen roller screen section 41, a wide screen roller screen section 42 and at least one pressing roller 43 which are sequentially arranged in the same plane, wherein the at least one pressing roller 43 is arranged at the end point end of the conveying direction of the roller screen assembly 204, the roller screen assembly 204 is obliquely arranged relative to the horizontal plane, and the height of the start point end of the conveying direction of the roller screen assembly 204 is higher than that of the end point end.

The fine material chute 201 is arranged below the fine screen roller screen section 41, and powder, pellets with an undersize particle size or green pellets in the pellets conveyed by the disc pelletizer 21 fall into the fine material chute 201 through a gap 411 between rollers of the fine screen roller screen section 41 and then automatically move to the second conveyor belt 28 through the fine material chute 201.

The middle material chute 202 is arranged below the wide-screen roller screen section 42, and qualified pellets or green pellets in the pellets conveyed by the disc pelletizer 21 fall into the middle material chute 202 through a gap 421 between the rollers of the wide-screen roller screen section 42, and then automatically move to the first conveying belt 221 through the middle material chute 202.

The large material chute 203 is arranged below the press roller 43, and pellets or green pellets with an excessively large particle size among the pellets conveyed by the disc pelletizer 21 are conveyed to the press roller 43 because the pellets with a large particle size cannot fall from the fine screen roller screen section 41 and the wide screen roller screen section 42, are crushed under the extrusion of opposite acting force formed between the rollers of the press roller 43, fall into the large material chute 203 below the press roller 43, and then automatically move to the second conveyor belt 28 through the large material chute 203.

In the roller screen crushing device 20 of the embodiment, the functions of particle size screening and large block crushing are realized on one roller screen device by arranging the fine screen roller screen section, the wide screen roller screen section and at least one press roller in a sectional manner; meanwhile, a fine material chute, a medium material chute and a large material chute are respectively arranged below the fine screen roller screen section, the wide screen roller screen section and the at least one press roller, and different particle sizes are respectively conveyed. The roller screen crushing device 20 has the advantages of complex functions, low cost and small occupied area.

Referring to fig. 3-5, preferably, in a preferred embodiment, the roller screen assembly 204 is inclined at an angle of 12-15 degrees relative to the horizontal. In this embodiment, the inclination angle of the roller screen assembly 204 relative to the horizontal plane is 13-14 degrees, the conveying speed of the pellets can be improved by the inclined arrangement of the roller screen assembly 204 relative to the horizontal plane, and meanwhile, the angle is set between 13-14 degrees, so that the rolling speed of the pellets on the roller screen assembly 204 is not too high to influence the particle size screening of the pellets.

Further, the roller screen assembly 204 is secured to the ground or within the frame of the roller screen crushing system by brackets 30 of different heights.

Further, the rollers of the fine screen roller screen section 41, the rollers of the wide screen roller screen section 42 and the rollers of the at least one press roller 43 are driven by independent motors, and can be conveniently replaced and debugged.

Further, referring to fig. 5-6 together, in a preferred embodiment, the number of the press rollers 43 is two, and the rotation directions of the

rollers

431 and 432 of the press rollers 43 are opposite to the rotation directions of the rollers of the fine screen roller section 41 and the rollers of the wide screen roller section 42. The

rollers

431 and 432 may be toothed rollers for increasing the crushing performance. It will be appreciated that in other embodiments, the number of the pressing rollers 43 may be set according to requirements, and the rotation directions of the pressing rollers 43 may form one or more pairs of pressing rollers with each other.

Further, the distance between the rollers of the fine screen roller screen section 41 is adjustably set; the distance between the rollers of the wide screen roller screen section 42 is adjustably set. Specifically, the distance between the rollers can be adjusted by arranging a plurality of mounting grooves on a roller screen base body (not shown) to adjust the mounting positions of the rollers; it can also be realized by other mechanical mechanisms; it should be understood by those skilled in the art that the present invention can be applied to various embodiments of the present application as long as the implementation manner of adjusting the distance between the rollers can be realized, and the detailed description thereof is omitted.

Further, the distance between the rollers of the fine screen roller section 41 is 7-9 mm; the spacing between the rollers of the wide screen roller screen section 42 is 14-18 mm.

In a preferred embodiment, the length of the large material chute 203 is set as long as possible, so that large pellets are broken into powder during falling after being broken, and the powder is convenient to return to the disc pelletizer 21 for pelletizing. The angle of tightening up of well material chute 202's chute is more than or equal to 70 degrees, well material chute 202's length is as short as possible, can prevent like this that fall in autumn from damaging, bonding and putty.

Referring again to fig. 2-7, the roller screen crushing system for pellet screening further includes a receiving pan 212. The take-up pan 212 sets up in the balling plate 211's of disc balling machine 21 below, the take-up pan 212 includes bottom surface 213 and sets up two lateral walls 215 on the bottom surface perpendicularly, lateral wall 215 highly be higher than the height of balling plate 211, two lateral walls 215 and bottom surface 213 is around forming the logical groove structure that the width reduces, wherein, the width of the feed inlet of take-up pan 212 is greater than the width of the discharge gate of take-up pan 212. The opening with the larger width at the upper end of the through groove structure is a feed inlet, and the opening with the smaller width at the lower end of the through groove structure is a discharge outlet.

Further, in a preferred embodiment, the bottom surface 213 of the receiving tray is bent toward one side of the discharge hole to form a bent surface 214. The lateral wall 215 is from one side of material receiving mouth to one side of discharge gate is the arc and extends or buckles. Thereby guarantee smooth, even roll of pelletizing and fall on roller screen breaker 20, prevent that the pelletizing from falling and damaging, even cloth has guaranteed screening efficiency.

Furthermore, the first conveyor belt 221 arranged below the middle material chute 202 of the roller screen crushing device 20 is perpendicular to the second conveyor belts 28 arranged below the fine material chute 201 and the large material chute 203, so that screening is facilitated, and material leakage is avoided; and at the same time, the arrangement space of the conveyor belt can be reduced.

Further, in a preferred embodiment, the number of the disc pelletizer 21 is multiple, and the number of the receiving tray 212, the roller screen crushing device 20 and the first conveyor belt 221 is matched with that of the disc pelletizer 21; the roller screen crusher system further comprises a third conveyor belt 222 disposed below the plurality of first conveyor belts 221, for receiving the conveyed pellets of the plurality of first conveyor belts 221 and transferring the pellets to a subsequent processing device. Therefore, the step of concentrated screening at the head of the chain grate in the prior art is dispersed to each disc pelletizer 21 for screening, the screening pressure is reduced, the material grading is more accurate, and the green pellet qualification rate is higher. Meanwhile, the green pellets are screened and arranged under the disk pelletizer 21, returned materials are returned nearby to the disk pelletizer, and qualified pellets are transported to the head of the chain grate machine, so that the increase of transportation cost caused by the long-distance transportation of the returned materials and the qualified pellets and the investment of the field of the adhesive tape machine are avoided.

Further, in a preferred embodiment, the roller screen crushing system further comprises a distributor disposed in a direction of a terminal end of the third conveyor belt 222.

Further, the roller screen crushing system further comprises a feed back system (not shown) for conveying the screened material conveyed by the second conveyor belt 28 to the disc pelletizer 21 for pelletizing again.

The above is only the preferred embodiment of the present invention, and not the scope of the present invention, all the equivalent structures or equivalent flow changes made by the contents of the specification and the drawings or the direct or indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A roller screen crushing device for pellet screening, characterized by comprising:

and the large material chute is arranged below the compression roller.

2. The roller screen crushing device for screening pellets as claimed in claim 1, wherein the inclination angle of the roller screen assembly relative to the horizontal plane is 12-15 degrees.

3. The roller screen crushing device for pellet screening of claim 1, wherein the rollers of the fine screen roller screen section, the rollers of the wide screen roller screen section and the rollers of the at least one pressing roller are all driven by independent motors.

4. The roller screen crushing device for pellet screening of claim 1, wherein the number of the pressing rollers is two, and the rotation direction of the rollers of the pressing rollers is opposite to the rotation direction of the rollers of the fine screen roller screen section and the rotation direction of the rollers of the wide screen roller screen section.

5. A roller screen crushing device for pellet screening as claimed in claim 1, wherein the distance between the rollers of the fine screen roller screen section is adjustably set; the distance between the rollers of the wide screen roller screen section is adjustably set.

6. A roller screen crushing device for pellet screening as claimed in any one of claims 1 to 5, wherein the distance between the rollers of the fine screen roller screen section is 7-9 mm; the distance between the rollers of the wide screen roller section is 14-18 mm; the tightening angle of the chute of the medium material chute is more than or equal to 70 degrees.

7. A roller screen crushing system for pellet screening, comprising:

the roller screen crushing device as claimed in any one of claims 1 to 5 arranged below the take-off pan;

8. The roller screen crushing system for screening pellets as claimed in claim 7, wherein the bottom surface of the receiving tray is bent towards one side of the discharge port; the lateral wall from connect one side of material mouthful to one side of discharge gate is the arc and extends or buckle.

9. The roller screen crushing system for screening pellets according to claim 7, wherein the number of the disc pelletizer is multiple, and the receiving trays, the roller screen crushing device and the first conveying belt are arranged in a manner of matching with the disc pelletizer; the roller screen crushing system further comprises a third conveying belt arranged below the plurality of first conveying belts and used for receiving the conveyed pellets of the plurality of first conveying belts and conveying the pellets to a subsequent processing device.

10. The roller screen crushing system for pellet screening of claim 7, further comprising a feed back system for transporting screened material conveyed by the second conveyor belt to the balling disc for re-balling.