Air inlet pipe structure of coal mill

Abstract

The utility model belongs to the technical field of coal mills, and relates to an air inlet pipe structure of a coal mill. The air inlet pipe structure of the coal mill is good in using effect. The device comprises an accelerating air pipe and a filtering air pipe, and is characterized in that the filtering air pipe is arranged at the upper end of the accelerating air pipe, and a Laval pipe is arranged in the accelerating air pipe; an adaptive sleeve is arranged in the filter air pipe, a filter screen supporting frame is arranged in the center in the adaptive sleeve, a side filter screen covers the side surface of the filter screen supporting frame, an upper filter screen covers the upper end of the filter screen supporting frame, the lower end of the filter screen supporting frame is opened, and a supporting ring plate is arranged between the outer wall of the lower end of the filter screen supporting frame and the inner wall of the lower end of the filter air pipe; the upper end of the accelerating air pipe is connected with the lower end of the filtering air pipe through a fastener.

Description

TECHNICAL FIELD

[0001] The utility model belongs to coal mill technical field, more specifically, the utility model relates to a coal mill air inlet pipe structure. BACKGROUND

[0002] The coal mill is the machinery that will be broken and is ground into coal powder, and the coal grinding process is the process that the coal is broken and its surface area is continuously increased. To increase the new surface area, the binding force between the solid molecules must be overcome, thus energy is consumed. The coal is ground into coal powder in the coal mill, mainly through crushing, breaking and grinding, and when the coal powder is screened and separated, the gas is poured into the coal mill through the external pipeline, so that the coal powder is blown up. The existing coal mill air inlet pipe only plays the role of guiding the wind, and the dust and impurities in the external air are also easy to enter the internal part of the coal mill, which affects the quality of the coal powder after screening and separation. In addition, with the further improvement of the quality requirements of the coal powder and the improvement of the convenience requirements of the maintenance and replacement of the related parts of the coal mill, the structure of the coal mill air inlet pipe needs to be further improved. SUMMARY

[0003] The utility model discloses to the above-mentioned problem provides a kind of coal mill air inlet pipe structure with good use effect.

[0004] To achieve the above object, the utility model adopts the following technical scheme, the utility model discloses accelerating wind pipe (1) and filter wind pipe (2), characterized by filter wind pipe (2) is arranged on the upper end of accelerating wind pipe (1), and accelerating wind pipe (1) is provided with Laval tube (16) in; filter wind pipe (2) is provided with adaptive sleeve (6) in, and the inside center of adaptive sleeve (6) is equipped with filter screen support frame (8), and the side surface of filter screen support frame (8) is covered with side filter screen (11), and the upper end of filter screen support frame (8) is covered with upper filter screen (22), and the lower end of filter screen support frame (8) is opened, and the outer wall between the lower end of filter screen support frame (8) and the inner wall of the lower end of filter wind pipe (2) is support circular ring plate (7);The upper end of accelerating wind pipe (1) is connected by fastener with the lower end of filter wind pipe (2).

[0005] As a preferred scheme, the side filter screen (11) and the upper filter screen (22) of the utility model adopt glass fiber filter screen.

[0006] As another preferred scheme, the filter screen support frame (8) of the utility model adopts mesh tube structure.

[0007] As another preferred scheme, the lower end of the filter screen support frame (8) of the utility model is external thread ring (18), and the inner wall of the support circular ring plate (7) is provided with internal thread corresponding to the external thread ring (18), and the outer wall of the support circular ring plate (7) and the inner wall of the adaptive sleeve (6) are provided with thread correspondingly.

[0008] As another preferred scheme, the side filter screen (11) is arranged on the outer side of the filter screen support frame (8), the upper side of the outer end surface of the side filter screen (11) is sleeved with a scraping ring (15), the inner wall of the scraping ring (15) is in contact with the outer wall of the side filter screen (11); and the lower end of the scraping ring (15) and the upper end of the support annular plate (7) are connected through a connecting rod (17).

[0009] As another preferred scheme, the mounting groove (10) is arranged in the lower part of the inner wall of the filter air pipe (2), and the side wall of the adaptive sleeve (6) is arranged in the mounting groove (10); the upper end of the mounting groove (10) is an inclined angle groove, and the upper end of the adaptive sleeve (6) is provided with an inclined angle limiting protrusion (12) corresponding to the inclined angle groove.

[0010] As another preferred scheme, the upper end of the accelerating air pipe (1) is provided with a first mounting flange (3), the lower end of the filter air pipe (2) is provided with a second mounting flange (4), the first mounting flange (3) and the second mounting flange (4) are connected through a hexagonal bolt (5), and the lower end of the accelerating air pipe (1) is provided with a main body connecting flange.

[0011] As another preferred scheme, the upper end surface of the first mounting flange (3) and the lower end surface of the second mounting flange (4) are provided with a ring-shaped sealing groove (13) in a corresponding mode, and a sealing gasket (14) is arranged in the sealing groove (13).

[0012] As another preferred scheme, the combination of the sealing gasket (14) and the sealing groove (13) is two groups, which are arranged in a radial direction.

[0013] As another preferred scheme, the upper end of the filter screen support frame (8) is connected with the inner wall of the upper end of the adaptive sleeve (6) through a support rod (9).

[0014] Secondly, the lower end of the inner wall of the adaptive sleeve (6) is provided with a ring-shaped bottom air guide inclined surface (19) which is inclined from outside up to inside down.

[0015] In addition, the inner wall of the adaptive sleeve (6) above the bottom air guide inclined surface (19) is provided with a ring-shaped upper air guide inclined surface (21) which is inclined from outside up to inside down, and the inner lower end of the upper air guide inclined surface (21) is arranged on the outer side of the inner lower end of the bottom air guide inclined surface (19).

[0016] The technical effects and advantages of the utility model are as follows:

[0017] The side filter screen (11) and the upper filter screen (22) can filter air; dust and impurities in the air are prevented from being introduced into the coal mill and mixed with coal powder, so that the quality of coal powder screening and separation is affected; and the quality of coal powder is improved.

[0018] The utility model discloses an accelerating air pipe (1) is provided with the laval pipe (16) can accelerate the air after filtering, and the outside air is imported into the inside of coal mill high efficiency, thereby effectively increasing the efficiency and effect of coal powder separation.

[0019] The utility model discloses accelerating air pipe (1) and filter air pipe (2) split structure, two parts are connected through fastener, adopt the structure of setting up adaptive sleeve (6) in filter air pipe (2) simultaneously, convenient for the overhaul, cleaning and replacement of parts.

[0020] The utility model discloses the combination filter structure of cylindrical side filter screen (11) and upper filter screen (22), increases single filtration area in certain space, long service time, long cleaning period. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is whole structure schematic diagram of the utility model.

[0022] Figure 2 It is whole main view cross section structure schematic diagram of the utility model.

[0023] Figure 3 It is adaptive sleeve cross section structure schematic diagram of the utility model.

[0024] Figure 4 It is the utility model Figure 2 A part enlarged structure schematic diagram.

[0025] Figure 5 It is the utility model Figure 2 B part enlarged structure schematic diagram.

[0026] Figure 6 It is setting air guide inclined plane structure schematic diagram of the utility model.

[0027] Figure 7 It is setting air guide inclined plane after air inlet flow direction schematic diagram of the utility model.

[0028] Figure 8 It is Figure 7 C part enlarged view.

[0029] Figure mark is: 1 accelerating air pipe, 2 filter air pipe, 3 first installation flange, 4 second installation flange, 5 inner hexagonal bolt, 6 adaptive sleeve, 7 support circular ring plate, 8 filter screen support frame, 9 installation support rod, 10 installation slot, 11 side filter screen, 12 bevel angle limit protrusion, 13 sealing groove, 14 sealing gasket, 15 scraper ring, 16 laval pipe, 17 connecting rod, 18 outer thread ring, 19 is bottom air guide inclined plane, 20 is handle, 21 is upper air guide inclined plane, 22 upper filter screen. DETAILED DESCRIPTION

[0030] As shown in the figure, the utility model discloses an accelerating air pipe (1) and filter air pipe (2), filter air pipe (2) sets up on the upper end of accelerating air pipe (1), and the inside of accelerating air pipe (1) is provided with the laval pipe (16), and the inside of filter air pipe (2) is provided with the adaptive sleeve (6), and the inside center of adaptive sleeve (6) is equipped with filter screen support frame (8), and the side of filter screen support frame (8) covers side filter screen (11), and the upper end of filter screen support frame (8) covers upper filter screen (22), and the lower end of filter screen support frame (8) is open, and the outer wall between the lower end of filter screen support frame (8) and the inner wall of filter air pipe (2) is support annular plate (7), and the upper end of accelerating air pipe (1) is connected with the lower end of filter air pipe (2) through fastener.

[0031] The upper end of the accelerating air pipe (1) is provided with a first mounting flange (3), and the lower end of the filter air pipe (2) is provided with a second mounting flange (4), and the first mounting flange (3) is connected with the second mounting flange (4) through a hexagonal bolt (5).

[0032] The accelerating air pipe (1) and the filter air pipe (2) are connected through flanges and bolts, which facilitates the disassembly and assembly of the accelerating air pipe (1) and the filter air pipe (2), and facilitates the maintenance, cleaning and replacement of components.

[0033] Corresponding annular sealing grooves (13) are arranged on the upper end surface of the first mounting flange (3) and the lower end surface of the second mounting flange (4), and sealing pads (14) are arranged in the sealing grooves (13).

[0034] The combination of the sealing pads (14) and the sealing grooves (13) is two groups arranged along the radial direction.

[0035] The sealing pads (14) are arranged to increase the sealing property between the accelerating air pipe (1) and the filter air pipe (2).

[0036] The side filter screen (11) and the upper filter screen (22) are made of glass fiber filter screen.

[0037] The glass fiber filter screen (11) is composed of high-strength continuous monofilament glass fiber, and has an increasing structure, which can effectively filter air. The gas introduced into the coal mill is filtered through the glass fiber filter screen (11), thereby avoiding the fusion of impurities in the air with coal powder.

[0038] The filter screen support frame (8) adopts a mesh tube structure. The filter screen support frame (8) can also adopt other structures that can support the filter screen and ventilate. For example, the filter screen support frame (8) can also be a horizontal and vertical bar frame or an upper and lower ring plus multiple vertical connecting rod structure.

[0039] The lower end of the filter screen support frame (8) is an external thread ring (18), the inner wall of the support circular ring plate (7) is provided with internal threads corresponding to the external thread ring (18), and the outer wall of the support circular ring plate (7) is provided with threads corresponding to the inner wall of the adapter sleeve (6).

[0040] The side filter screen (11) is arranged on the outer side of the filter screen support frame (8), the upper side of the outer end face of the side filter screen (11) is sleeved with a scraping ring (15), the inner wall of the scraping ring (15) is in contact with the outer wall of the side filter screen (11), and the lower end of the scraping ring (15) is connected with the upper end of the support circular ring plate (7) through a connecting rod (17).

[0041] A handle (20) can be installed at the bottom end of the support circular ring plate (7) to rotate the support circular ring plate (7), so that the support circular ring plate (7) can be conveniently disassembled from the adapter sleeve (6) and the external thread ring (18).

[0042] The inner wall of the filter air pipe (2) is provided with an installation groove (10) in the middle lower part, and the side wall of the adapter sleeve (6) is arranged in the installation groove (10); the upper end of the installation groove (10) is an inclined angle groove, and the upper end of the adapter sleeve (6) is provided with an inclined angle limiting protrusion (12) corresponding to the inclined angle groove.

[0043] The upper end of the filter screen support frame (8) is connected with the inner wall of the upper end of the adapter sleeve (6) through a support rod (9).

[0044] When it is necessary to clean the filtered dust, the adapter sleeve (6) can be slid out from the bottom of the installation groove (10) of the filter air pipe (2) after the accelerated air pipe (1) and the filter air pipe (2) are disassembled, the adapter sleeve (6) is inverted first to pour out the dust in the adapter sleeve (6), then the support circular ring plate (7) is screwed to separate the support circular ring plate (7) from the adapter sleeve (6) and the filter screen support frame (8). Then the support circular ring plate (7) is moved downward to pull the scraping ring (15) along the outer wall of the side filter screen (11) through the connecting rod (17), and the scraping ring (15) cleans the dust adhered to the outer wall of the side filter screen (11). The upper filter screen (22) can be directly cleaned. After long-term use, the adapter sleeve (6) can be replaced with a new one to ensure the filtering effect.

[0045] While the support circular ring plate (7) is screwed, the scraping ring (15) is also rotated, and the scraping ring (15) has no connection relationship with the filter screen support frame (8) and the side filter screen (11). The connecting rod (17) can also be connected with the scraping ring (15) only, and the connecting rod (17) is pulled downward to clean the glass fiber filter screen (11).

[0046] The cylindrical glass fiber side filter screen (11) covering the side wall of the filter screen support frame (8) is covered with dust after long time use, if the shape of the dust is regarded as a cylinder, the outer diameter of the cylindrical dust is larger than the outer diameter of the cylindrical glass fiber side filter screen (11), the inner wall of the scraping ring (15) is in contact with the outer wall of the cylindrical glass fiber side filter screen (11), thus the scraping ring (15) can scrape off the dust. After the dust is scraped off, the outer wall of the side filter screen (11) is free of dust, which facilitates the upward pushing of the scraping ring (15) back to the original position.

[0047] The scraping ring (15) can also be made of a material with elasticity, appropriate extrusion force is added, and the dust scraping effect is improved.

[0048] The scraping ring (15) and the connecting rod (17) are only preferred solutions, and are not essential technical features; the dust can be manually cleaned, and the scraping ring (15) and the connecting rod (17) are not arranged, and the cost of the device is reduced.

[0049] The lower end of the inner wall of the adapter sleeve (6) is provided with a ring-shaped bottom air guide slope (19) inclined from outside to inside and downward, and the air introduction efficiency is improved.

[0050] The inner wall of the adapter sleeve (6) above the bottom air guide slope (19) is provided with a ring-shaped upper air guide slope (21) inclined from outside to inside and downward, and the inner lower end of the upper air guide slope (21) is located outside the inner lower end of the bottom air guide slope (19) (that is, the horizontal length d of the upper air guide slope (21) is less than the horizontal length D of the bottom air guide slope (19), as shown in the figure). Figure 8 The upper air guide slope (21) mainly guides the wind on the outside to the middle, and the bottom air guide slope (19) mainly guides the wind on the inside to the middle.

[0051] The upper air guide slope (21) is a plurality of vertical arrangements; the inner lower end of the upper air guide slope (21) above the adjacent upper air guide slope (21) is located outside the inner lower end of the upper air guide slope (21) below. That is, the horizontal length d of the upper air guide slope (21) gradually increases from top to bottom, and the wind from the outside to the inside gradually converges to the middle.

[0052] The threaded connection of the inner wall of the supporting circular plate (7) with the outer wall of the outer threaded ring (18) and the threaded connection of the outer wall of the supporting circular plate (7) with the lower end of the inner wall of the adapter sleeve (6) are only preferred solutions and are not essential technical features. The supporting circular plate (7), the adapter sleeve (6) and the outer threaded ring (18) can be arranged as an integral structure, or only the outer wall of the supporting circular plate (7) can be threadedly connected with the lower end of the inner wall of the adapter sleeve (6), and the inner end surface of the supporting circular plate (7) can be matched with the outer end surface of the outer threaded ring (18) after the supporting circular plate (7) is screwed, so that the supporting circular plate (7) is not connected with the outer threaded ring (18), thereby reducing the cost of the device. The area between the supporting rods (9) and the filter screen (11) on the opposite side of the central hole of the outer threaded ring (18) can be cleaned, or a new adapter sleeve (6) can be directly replaced. The supporting circular plate (7) can be connected with the lower end of the adapter sleeve (6) and / or the lower end of the filter screen supporting frame (8) in a clamping mode.

[0053] As shown in Figure 1 The inner wall of the accelerating air pipe (1) is located inside the outer wall of the adapter sleeve (6), and the upper end of the accelerating air pipe (1) supports the lower end of the adapter sleeve (6).

[0054] The working principle of the utility model is as follows:

[0055] When the utility model is used, the staff inserts the adapter sleeve (6) into the inside of the installation groove (10) from the bottom of the filtering air pipe (2), then the staff can install the accelerating air pipe (1) on the lower side of the filtering air pipe (2), and the sealing gasket (14) is clamped in the inside of the sealing groove (13), so that the convection air pipe (1) and the filtering air pipe (2) are sealed. Then the accelerating air pipe (1) and the filtering air pipe (2) are installed and fixed through the inner hexagonal bolt (5), then the lower end main body connecting flange of the accelerating air pipe (1) is connected with the air inlet of the coal mill. The upper end of the filtering air pipe (2) can also be provided with a connecting flange (the flange is not shown in the figure).

[0056] When the external air is introduced into the inside of the filtering air pipe (2) from the top of the filtering air pipe (2), the dust and impurities in the external air are filtered by the upper filter screen (22) and the side filter screen (11) and then enter the accelerating air pipe (1), the Laval tube (16) in the accelerating air pipe (1) accelerates the filtered air, and then the filtered air enters the coal mill, thereby increasing the effect and efficiency of coal powder separation.

[0057] Although the foregoing description is that the filtering air pipe (2) is arranged on the upper end of the accelerating air pipe (1), the utility model can be arranged horizontally, and the external air is introduced into the filtering air pipe (2) by the driving fan.

[0058] Finally should be explained a few points: the utility model discloses embodiment attached drawing, only relate to the structure with the disclosure embodiment involved, other structures can refer to the usual design, under the condition of not conflict, the utility model same embodiment and different embodiment can be combined with each other.

[0059] The above only for the preferred embodiment of the utility model has, and does not for limiting the utility model, any modification, equivalent replacement, improvement etc. that is made within the spirit and principle of the utility model, should be included in the protection scope of the utility model.

Claims

1. A structure of an air inlet pipe of a coal mill, comprising an accelerating air pipe (1) and a filtering air pipe (2), characterized in that The filter air pipe (2) is arranged on the upper end of the accelerating air pipe (1), and the accelerating air pipe (1) is internally provided with a Laval tube (16); the filter air pipe (2) is internally provided with an adaptive sleeve (6), the inside of the adaptive sleeve (6) is centrally provided with a filter screen support frame (8), the side of the filter screen support frame (8) is covered with a side filter screen (11), the upper end of the filter screen support frame (8) is covered with an upper filter screen (22), the lower end of the filter screen support frame (8) is open, and the outer wall of the lower end of the filter screen support frame (8) and the inner wall of the lower end of the filter air pipe (2) are connected through a support circular ring plate (7); the upper end of the accelerating air pipe (1) and the lower end of the filter air pipe (2) are connected through fasteners.

2. A coal mill air inlet duct structure according to claim 1, characterised in that The side filter screen (11) and the upper filter screen (22) are made of glass fiber filter screens.

3. A coal mill air inlet duct structure according to claim 1, characterised in that The lower end of the filter screen support frame (8) is provided with an external thread ring (18), the inner wall of the support circular ring plate (7) is provided with an internal thread corresponding to the external thread ring (18), and the outer wall of the support circular ring plate (7) and the inner wall of the adaptive sleeve (6) are provided with threads in correspondence.

4. A coal mill air inlet duct structure according to claim 3, characterised in that The side filter screen (11) is arranged on the outer side of the filter screen support frame (8), the upper side of the outer end face of the side filter screen (11) is sleeved with a scraping ring (15), the inner wall of the scraping ring (15) is in contact with the outer wall of the side filter screen (11), and the lower end of the scraping ring (15) and the upper end of the support circular ring plate (7) are connected through a connecting rod (17).

5. A coal mill air inlet duct structure according to claim 1, characterised in that The inner wall of the filter air pipe (2) is provided with an installation groove (10) in the middle and lower part, and the side wall of the adaptive sleeve (6) is arranged in the installation groove (10); the upper end of the installation groove (10) is an inclined angle groove, and the upper end of the adaptive sleeve (6) is provided with an inclined angle limiting protrusion (12) corresponding to the inclined angle groove.

6. A coal mill air inlet duct structure according to claim 1, characterised in that The upper end of the first installation flange (3) and the lower end of the second installation flange (4) are provided with annular sealing grooves (13) in correspondence, and the sealing grooves (13) are provided with sealing pads (14).

7. A coal mill air inlet duct structure according to claim 6, characterised in that The upper end of the filter screen support frame (8) is connected with the inner wall of the upper end of the adaptive sleeve (6) through a support rod (9).

8. A coal mill air inlet duct structure according to claim 1, characterised in that The inner wall of the adaptive sleeve (6) is provided with an annular bottom air guide inclined surface (19) inclined from outside up to inside down.

9. A coal mill air inlet duct structure according to claim 1, characterised in that The inner wall of the adaptive sleeve (6) above the bottom air guide inclined surface (19) is provided with an annular upper air guide inclined surface (21) inclined from outside up to inside down, and the inner lower end of the upper air guide inclined surface (21) is arranged on the outside of the inner lower end of the bottom air guide inclined surface (19).

10. A coal mill air inlet duct structure according to claim 9, characterised in that ​

Images