Coal mill grinding head air pipe cleaning device

Abstract

The utility model relates to the related technical field of coal mill grinding head equipment, in particular to a coal mill grinding head air pipe cleaning device which comprises a coal mill bin body, the feeding end of the coal mill bin body is connected with a discharging pipe, and the side wall of the output end of the discharging pipe is connected with an air pipe. The pipe wall close to the output end of the air pipe is cut, an installation gap with a certain spacing distance is formed, the air pipe is divided into a first pipe fitting and a second pipe fitting through the installation gap, the first pipe fitting and the second pipe fitting are connected through a fixing sleeve, an annular rotating piece is connected to the installation gap, and the annular rotating piece is connected with the air pipe. The mounting gap for mounting the rotating piece is formed in the position, close to the output end of the air pipe, of the air pipe, the driving piece drives the scraping plate connected to the rotating piece to move synchronously, the scraping plate can scrape down coal powder attached to the inner side wall of the branch pipe, and the coal powder is driven by airflow flowing in the air pipe to flow into the coal mill bin body again; and thus, the cleaning operation of the pulverized coal attached to the air pipe is completed.

Description

TECHNICAL FIELD

[0001] The utility model relates to coal mill head equipment related technical field especially, it is a kind of coal mill head air pipe cleaning device. BACKGROUND

[0002] Coal mill head has vital role in coal mill system, and it is the key component of coal mill system, which is responsible for grinding coal into coal powder, it is extruded and ground to coal by rotating mill roller and millstone, and large block coal is broken into fine powder, so that subsequent processing of raw coal is carried out, in the use process of coal mill head, dry hot air is provided by the hot air system of equipment, to help coal drying and improve its coal grinding efficiency.

[0003] When the hot air system transports dry hot air to the raw coal bin of coal mill head, it is mainly transported through the air pipe arranged on the feeding device, and the raw coal belt scale for feeding into the raw coal bin of coal mill head is arranged on the feeding device, the raw coal belt scale feeds material into the raw coal bin of coal mill equipment through the discharge pipe, when raw coal exchanges heat with dry hot air, part of fine coal powder will be accumulated at the mill head air pipe, which is easy to cause coal powder spontaneous combustion, so that there is a safety risk in the operation of coal mill equipment.

[0004] Based on the above situation, a coal mill head air pipe cleaning device is needed to solve the above problems. UTILITY MODEL CONTENTS

[0005] The utility model provides a kind of coal mill head air pipe cleaning device, to solve the problem that fine coal powder will be accumulated at the mill head air pipe in prior art, which is easy to cause coal powder spontaneous combustion, so that there is a safety risk in the operation of coal mill equipment.

[0006] The technical problem solved by the utility model is realized by the following technical scheme:

[0007] A kind of coal mill head air pipe cleaning device, including coal mill bin body, the discharge pipe is connected on the feeding end of the coal mill bin body, the side wall of the output end of the discharge pipe is connected with air pipe, cutting the pipe wall close to the output end position of the air pipe and forming the installation gap with certain interval distance, the installation gap divides air pipe into two parts of pipe piece one and pipe piece two, and the pipe piece one and the pipe piece two are connected by fixed sleeve, annular rotating piece is connected on the installation gap, the rotating piece is driven to rotate by being arranged on the fixed sleeve driving part, scraper is connected on the inner side wall of the rotating piece, and the scraper is in contact with the inner side wall of air pipe.

[0008] Preferably, the driving part includes gear ring connected on the outer side wall of rotating piece, gear connected on fixed sleeve and driving motor mounted on fixed sleeve, the output end of the driving motor is connected with gear, and the gear is engaged with gear ring.

[0009] Preferably, the scraper is composed of a fixed plate connected to the rotating member, two extrusion plates and two telescopic grooves, the two telescopic grooves are located at both sides of the rotating member, the two extrusion plates are slidably connected to the two telescopic grooves respectively, and springs are arranged in the telescopic grooves and connected to the extrusion plates and the fixed plate.

[0010] Preferably, the pipe one and the pipe two are connected with labyrinth gaskets at one end of the installation gap, the rotating member is rotatably connected between the two labyrinth gaskets, and the labyrinth gaskets are connected with sealing rings which are in contact with the rotating member.

[0011] Preferably, annular protrusions are arranged on both sides of the rotating member, the annular protrusions are embedded in the labyrinth gaskets and are in movable contact with the labyrinth gaskets.

[0012] Preferably, an oil seal ring is arranged on the labyrinth gasket, and one side of the oil seal ring is in close contact with the surface of the rotating member.

[0013] The utility model has the beneficial effects that: the installation gap for installing the rotating member is arranged on the air pipe near the output end, the driving member drives the rotating member to move synchronously, the scraper connected to the rotating member is also driven to move synchronously, the scraper scrapes the coal powder attached to the inner wall of the air pipe, the coal powder is driven by the airflow in the air pipe and flows into the coal mill body, thus the cleaning operation of the coal powder attached to the air pipe is completed, the fine coal powder is prevented from accumulating in the mill head air pipe, the coal powder is prevented from self-igniting, and the safety of the coal mill equipment is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to these drawings without creative labor for those skilled in the art.

[0015] Figure 1 It is a plane structure schematic view of the utility model;

[0016] Figure 2 It is a sectional structure schematic view of the utility model;

[0017] Figure 3 It is a local structure sectional schematic view of the utility model;

[0018] Figure 4 It is a sectional structure schematic view of the utility model; Figure 3Structure enlarged schematic view at middle A;

[0019] Figure 5 The sectional view schematic diagram of the installation gap structure of the utility model is shown in the figure;

[0020] Figure 6 The three-dimensional structure schematic diagram of the driving part of the utility model is shown in the figure;

[0021] Figure 7 The exploded schematic view of the scraper of the utility model is shown in the figure;

[0022] Figure 8 The exploded schematic view of part structure of the utility model is shown in the figure.

[0023] In the figure, 1, coal mill body;2, discharge pipe;3, air pipe;4, installation gap;5, pipe fitting one;6, pipe fitting two;7, fixed sleeve;8, rotating part;9, scraper;10, gear ring;11, gear;12, driving motor;13, fixed plate;14, extrusion plate;15, expansion slot;16, spring;17, labyrinth gasket;18, sealing ring;19, annular protrusion;20, oil seal ring. DETAILED DESCRIPTION

[0024] In order to make the technical means, creation features, purposes and effects realized by the utility model easy to understand, the utility model is further described below in combination with specific figures.

[0025] Referring to Figures 1-8 As shown in the figure, a coal mill head air pipe cleaning device, including coal mill body 1, the feed end of coal mill body 1 is connected with discharge pipe 2, the side wall of the output end of discharge pipe 2 is connected with air pipe 3, the whole air pipe 3 is column structure, in use, the input end of discharge pipe 2 receives the raw coal sent from raw coal belt scale, the raw coal will pass through the position of air pipe 3 and discharge pipe 2 communication intersection, then enter the coal mill body 1 at the output end position of discharge pipe 2, under the processing of coal mill body 1, the large raw coal becomes fine particle state.

[0026] In order to facilitate the cleaning of the inner wall of the coal mill head air pipe 3, the pipe wall near the output end of the air pipe 3 is cut and a mounting gap 4 with a certain spacing distance is formed. The width of the mounting gap 4 is selected according to actual use needs. At this time, the mounting gap 4 divides the air pipe 3 into two parts, i.e. pipe part one 5 and pipe part two 6, and the pipe part one 5 and the pipe part two 6 are connected through a fixed sleeve 7. At this time, the fixed sleeve 7 covers the mounting gap 4, and the mounting gap 4 is in a closed state. The mounting gap 4 is connected with an annular rotating part 8. The rotating part 8 is also located in the fixed sleeve 7. The rotating part 8 is driven to rotate by a driving part arranged on the fixed sleeve 7. In order to scrape the attached coal powder on the inner wall of the air pipe 3, a scraper 9 is connected to the inner wall of the rotating part 8. The scraper 9 is in contact with the inner wall of the air pipe 3. When the driving part drives the rotating part 8 to rotate, the scraper 9 is also driven to move synchronously, thereby scraping the attached coal powder on the inner wall of the air pipe 3, and the air flow in the air pipe 3 is driven to flow into the coal mill bin body 1 again.

[0027] The driving part includes a gear ring 10 connected to the outer wall of the rotating part 8, a gear 11 connected to the fixed sleeve 7, and a driving motor 12 mounted on the fixed sleeve 7. The output end of the driving motor 12 is connected with the gear 11, and the gear 11 is engaged with the gear ring 10.

[0028] In order to further enhance the scraping effect between the scraper 9 and the inner wall of the air pipe 3, the scraper 9 is composed of a fixed plate 13 connected to the rotating part 8 and two extrusion plates 14. Two expansion grooves 15 are arranged on the fixed plate 13, and the two expansion grooves 15 are respectively located at both sides of the rotating part 8. The two extrusion plates 14 are respectively connected in the two expansion grooves 15. A spring 16 is arranged in the expansion groove 15, and the two ends of the spring 16 are respectively connected with the extrusion plate 14 and the fixed plate 13. When the fixed plate 13 is mounted on the rotating part 8, one side of the extrusion plate 14 is in close contact with the inner wall of the pipe under the action of the spring 16. When the rotating part 8 drives the scraper 9 to move synchronously, the extrusion plate 14 is always in close contact with the inner wall of the air pipe 3. The influence of the centrifugal force on the scraper 9 and the flatness of the inner surface of the air pipe 3 is avoided, and the scraping effect of the scraper 9 is enhanced.

[0029] When the raw coal is contacted with the hot air, the hot air is bounced off the wall of the raw coal and the discharge pipe 2, which disturbs the air flow. The fine coal powder scattered from the coal mill bin body 1 will be attached to the output end of the air pipe 3 along with the disturbed air flow and the air flow gap. Therefore, the length of the scraper 9 is designed according to the actual attachment of the coal powder to avoid redundant structure waste.

[0030] Further, in order to further enhance the sealing degree between the rotating member 8 and the installation gap 4, and avoid the phenomenon of air leakage from the air pipe 3 due to the rotating member 8, the labyrinth gasket 17 is connected to the pipe member 1 5 and the pipe member 6 at the end close to the installation gap 4, the rotating member 8 is rotatably connected between the two labyrinth gaskets 17, the sealing ring 18 is connected to the labyrinth gasket 17, and the rotating member 8 rotates in the installation gap 4, the sealing ring 18 is always in contact with the rotating member 8, thereby reducing the hot air in the air pipe 3 from flowing out from the gap between the rotating member 8 and the labyrinth gasket 17, and preventing the coal powder in the air pipe 3 from flowing out from the gap.

[0031] In order to further avoid the hot air in the air pipe 3 from flowing out from the gap between the rotating member 8 and the labyrinth gasket 17, the oil seal ring 20 is arranged on the labyrinth gasket 17, one side of the oil seal ring 20 is in close contact with the surface of the rotating member 8, thereby ensuring that the air pipe 3 will not be affected by the rotating member 8 and will not leak air.

[0032] Finally, in order to enable the rotating member 8 to rotate at a specific position and not to fall off when rotating between the two labyrinth gaskets 17, the annular protrusion 19 is arranged on both sides of the rotating member 8, and the annular protrusion 19 is embedded in the labyrinth gasket 17 and is in movable contact with the labyrinth gasket 17.

Claims

1. A coal mill head air pipe cleaning device, comprising a coal mill bin body (1), a feeding pipe (2) connected to the feeding end of the coal mill bin body (1), and an air pipe (3) connected to the side wall of the output end of the feeding pipe (2), characterized in that, The pipe wall near the output end of the air pipe (3) is cut to form a mounting gap (4) with a certain distance, the mounting gap (4) divides the air pipe (3) into a pipe part one (5) and a pipe part two (6), the pipe part one (5) and the pipe part two (6) are connected through a fixed sleeve (7), a rotating part (8) is connected to the mounting gap (4), the rotating part (8) is driven to rotate through a driving part arranged on the fixed sleeve (7), a scraper (9) is connected to the inner side wall of the rotating part (8), and the scraper (9) is in contact with the inner side wall of the air pipe (3).

2. A coal mill nozzle cleaning device according to claim 1, wherein, The driving part comprises a gear ring (10) connected to the outer side wall of the rotating part (8), a gear (11) connected to the fixed sleeve (7), and a driving motor (12) mounted on the fixed sleeve (7), the output end of the driving motor (12) is connected to the gear (11), and the gear (11) is engaged with the gear ring (10).

3. A coal mill nozzle cleaning device according to claim 1, wherein, The scraper (9) is composed of a fixed plate (13) connected to the rotating part (8) and two extrusion plates (14), two telescopic grooves (15) are arranged in the fixed plate (13) and located at both sides of the rotating part (8), the two extrusion plates (14) are slidably connected in the two telescopic grooves (15), springs (16) are arranged in the telescopic grooves (15), and the two ends of the springs (16) are connected with the extrusion plates (14) and the fixed plate (13).

4. A coal mill nozzle cleaning device according to claim 1, wherein, The pipe part one (5) and the pipe part two (6) are connected with labyrinth gaskets (17) at one end near the mounting gap (4), the rotating part (8) is rotatably connected between the two labyrinth gaskets (17), the labyrinth gaskets (17) are connected with sealing rings (18), and the sealing rings (18) are in contact with the rotating part (8).

5. A coal mill nozzle cleaning device according to claim 4, wherein, Annular protrusions (19) are arranged on both sides of the rotating part (8), the annular protrusions (19) are embedded in the labyrinth gaskets (17) and are in movable contact with the labyrinth gaskets (17).

6. A coal mill nozzle cleaning device according to claim 4, wherein, An oil seal ring (20) is arranged on the labyrinth gasket (17), and one side of the oil seal ring (20) is in close contact with the surface of the rotating part (8).

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