Rotary kiln dust collection device and rotary kiln system

Abstract

The utility model belongs to the technical field of rotary kiln dust treatment, and particularly provides a rotary kiln dust collection device and a rotary kiln system.The rotary kiln dust collection device comprises a dust collector, an annular dust collection cover and a plurality of dust collection pipes, and the annular dust collection cover is used for being arranged on a rotary kiln in a sleeving mode and corresponds to a gap between a kiln tail and a kiln cylinder of the rotary kiln; the multiple dust collection pipes are distributed in the circumferential direction of the annular dust collection cover at intervals, one ends of the dust collection pipes communicate with an inner cavity of the annular dust collection cover, and the other ends of the dust collection pipes are connected with the dust collector. Dust sprayed out of a gap between the kiln tail and the kiln cylinder of the rotary kiln enters the annular dust collection cover and then flows to the dust collector along the dust collection pipes along with airflow, dust collection is achieved, and the problems that due to the fact that the dust is sprayed into the external environment, environment pollution is caused, and cleaning cost is increased are effectively solved; dust entering the annular dust suction cover can enter the dust suction pipes in a dispersed mode, and therefore the dust suction efficiency can be improved.

Description

Technical Field

[0001] The present application belongs to the technical field of rotary kiln dust treatment, and in particular relates to a rotary kiln dust collection device and a rotary kiln system. Background Art

[0002] The kiln tail and the kiln barrel of a rotary kiln are generally sealed by packing. Affected by the processing accuracy of the kiln tail and the kiln barrel, the assembly accuracy of the kiln tail and the kiln barrel, and the wear of the packing, there will be a gap between the kiln tail and the kiln barrel. When the rotary kiln works under positive pressure conditions, the dust inside the rotary kiln will be sprayed into the external environment through the gap, which not only causes environmental pollution and harms human health, but also the subsequent cleaning of the dust will lead to increased operating costs. Utility Model Content

[0003] The purpose of the present application is to provide a rotary kiln dust suction device and a rotary kiln system, aiming to solve the technical problem in the prior art that dust inside the rotary kiln is sprayed into the external environment through the gap between the kiln tail and the kiln tube, causing environmental pollution, endangering human health, and increasing the cost of dust cleaning.

[0004] On the one hand, in order to achieve the above-mentioned purpose, the technical solution adopted in the present application is: a rotary kiln dust suction device, including a vacuum cleaner, an annular dust hood and a plurality of vacuum pipes, the annular dust hood is used to be mounted on the rotary kiln, and is arranged corresponding to the gap between the kiln tail and the kiln barrel of the rotary kiln, the plurality of vacuum pipes are distributed at intervals along the circumference of the annular dust hood, one end of the vacuum pipe is connected to the inner cavity of the annular dust hood, and the other end of the vacuum pipe is connected to the vacuum cleaner.

[0005] Compared with the prior art, the rotary kiln dust collection device provided in the present application has the beneficial effect that: when working, the vacuum cleaner sucks the air in the annular dust collection hood, forming a negative pressure in the annular dust collection hood, and the dust sprayed from the gap between the kiln tail and the kiln barrel of the rotary kiln enters the annular dust collection hood, and then flows along the dust collection pipe to the vacuum cleaner with the air flow, thereby realizing dust collection, effectively avoiding the environmental pollution and increased cleaning cost caused by the dust being sprayed into the external environment, and by arranging multiple dust collection pipes, the multiple dust collection pipes are distributed at intervals along the circumference of the annular dust collection hood, so that the dust entering the annular dust collection hood can be dispersedly entered into each dust collection pipe, thereby improving the dust collection efficiency.

[0006] Furthermore, a dust inlet is provided on the inner ring side of the annular dust hood, and the dust inlet extends in a ring shape along the circumference of the annular dust hood. A plurality of dust outlets are provided on the outer ring side of the annular dust hood, and the plurality of dust outlets are distributed at intervals along the circumference of the annular dust hood and are connected to a plurality of dust pipes one by one, and the dust outlets are narrowed in the direction away from the dust inlet.

[0007] Furthermore, the annular dust hood includes a circular portion and multiple conical portions, a dust inlet is provided on the inner ring side of the circular portion, the multiple conical portions are distributed at intervals along the circumference of the circular portion, one end of the conical portion is connected to the outer ring side of the circular portion, the other end of the conical portion is connected to the dust collection pipe, a dust outlet is formed in the conical portion, and the dust outlet is connected to the inner cavity of the circular portion.

[0008] Furthermore, an adjusting air valve is arranged on the dust suction pipe.

[0009] Furthermore, the rotary kiln dust collection device also includes a collecting container and a collecting pipe. One end of the dust collection pipe away from the annular dust collection cover is connected to the collecting container, and the collecting container is connected to the dust collector through the collecting pipe.

[0010] Furthermore, a cleaning port is provided at the bottom of the collecting pipe.

[0011] Furthermore, the rotary kiln dust collection device also includes a filter and a recovery container. The dust collection pipe is connected to the dust collector through the filter. The recovery container is arranged at the bottom of the filter. The dust intercepted by the filter can fall into the recovery container.

[0012] On the other hand, to achieve the above purpose, the technical solution adopted in the present application is: a rotary kiln system, including a rotary kiln and the above rotary kiln dust collection device, the rotary kiln including a kiln tail and a kiln tube.

[0013] Compared with the prior art, the rotary kiln system provided by the present application has the following beneficial effects: the above-mentioned rotary kiln dust collection device is adopted, and when working, the vacuum cleaner sucks the air in the annular dust collection hood, forming a negative pressure in the annular dust collection hood, and the dust sprayed from the gap between the kiln tail and the kiln barrel of the rotary kiln enters the annular dust collection hood, and then flows along the dust collection pipe to the vacuum cleaner with the air flow, so as to realize dust collection, and effectively avoid the environmental pollution and increased cleaning cost caused by the dust being sprayed into the external environment, and the number of dust collection pipes is multiple, and the multiple dust collection pipes are distributed at intervals along the circumference of the annular dust collection hood, so that the dust entering the annular dust collection hood can be dispersedly entered into each dust collection pipe, thereby improving the dust collection efficiency.

[0014] Furthermore, the kiln tail is sleeved on one end of the kiln barrel, the kiln barrel can rotate relative to the kiln tail, the annular dust hood is sleeved on the kiln barrel and fixed on the kiln tail, and an annular gap is provided between the annular dust hood and the kiln barrel.

[0015] Furthermore, the annular dust hood includes a mounting plate portion, a connecting pipe portion and an annular hood body portion which are arranged in sequence along a direction away from the kiln tail, the mounting plate portion is fixed on the kiln tail, one end of the connecting pipe portion is fixed on the mounting plate portion, and the other end of the connecting pipe portion is fixed on the annular hood body portion, and an annular gap is provided between one end of the annular hood body portion away from the connecting pipe portion and the kiln tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 A schematic diagram of a partial structure of a rotary kiln system provided in an embodiment of the present application;

[0018] Figure 2 for Figure 1 A front view of an annular dust collection hood of a rotary kiln dust collection device is shown;

[0019] Figure 3 for Figure 1 A side view of the annular dust hood of the rotary kiln dust collection device shown;

[0020] Figure 4 for Figure 3 A cross-sectional view of the annular dust hood along the AA section line;

[0021] Figure 5 for Figure 2 A schematic structural diagram of the semi-annular portion of the annular dust hood shown;

[0022] Figure 6 A partial structural cross-sectional view of a rotary kiln system provided in an embodiment of the present application;

[0023] Figure 7 for Figure 6 Enlarged view at B.

[0024] Among them, the reference numerals in the figure are:

[0025] 100, rotary kiln dust suction device; 10, dust collector; 20, annular dust suction hood; 21, annular hood body; 211, dust inlet; 212, dust outlet; 213, annular portion; 214, conical portion; 22, connecting pipe portion; 23, mounting plate portion; 24, semi-annular portion; 241, fixing plate; 242, fixing hole; 30, dust suction pipe; 40, regulating air valve; 50, collecting container; 60, collecting pipe; 70, filter; 80, recovery container;

[0026] 200, rotary kiln; 201, kiln tail; 202, kiln tube; 203, packing gland;

[0027] 300. Annular gap. DETAILED DESCRIPTION

[0028] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0029] In the description of the present application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0031] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0032] like Figure 1 As shown, an embodiment of the present application provides a rotary kiln dust collection device 100, including a vacuum cleaner 10, an annular vacuum hood 20 and a plurality of vacuum pipes 30. The annular vacuum hood 20 is used to be mounted on the rotary kiln 200 and is arranged corresponding to the gap between the kiln tail 201 and the kiln barrel 202 of the rotary kiln 200. The plurality of vacuum pipes 30 are distributed at intervals along the circumference of the annular vacuum hood 20. One end of the vacuum pipe 30 is connected to the inner cavity of the annular vacuum hood 20, and the other end of the vacuum pipe 30 is connected to the vacuum cleaner 10.

[0033] During operation, the vacuum cleaner 10 sucks air from the annular dust hood 20, forming a negative pressure in the annular dust hood 20, and the dust sprayed from the gap between the kiln tail 201 and the kiln tube 202 of the rotary kiln 200 enters the annular dust hood 20, and then flows along the dust pipe 30 to the vacuum cleaner 10 with the air flow, thereby collecting the dust, and effectively avoiding the environmental pollution and increased cleaning costs caused by the dust being sprayed into the external environment. By providing a plurality of dust pipes 30, the plurality of dust pipes 30 are distributed at intervals along the circumference of the annular dust hood 20, so that the dust entering the annular dust hood 20 can enter each dust pipe 30 in a dispersed manner, thereby improving the dust collection efficiency.

[0034] In one embodiment, in combination Figure 3 and Figure 4 As shown, a dust inlet 211 is provided on the inner ring side of the annular dust hood 20, and the dust inlet 211 extends in a ring shape along the circumference of the annular dust hood 20, and a plurality of dust outlets 212 are provided on the outer ring side of the annular dust hood 20, and the plurality of dust outlets 212 are distributed at intervals along the circumference of the annular dust hood 20, and are connected to a plurality of dust suction pipes 30 in a one-to-one correspondence, and the dust outlets 212 are narrowed in a direction away from the dust inlet 211. It should be noted that the inner ring side of the annular dust hood 20 refers to the side of the annular dust hood 20 facing the rotary kiln 200 when the annular dust hood 20 is sleeved on the rotary kiln 200, and conversely, the outer ring side of the annular dust hood 20 refers to the side of the annular dust hood 20 facing away from the rotary kiln 200 when the annular dust hood 20 is sleeved on the rotary kiln 200. During operation, the dust sprayed from the gap between the kiln tail 201 and the kiln barrel 202 enters the inner cavity of the annular dust hood 20 from the dust inlet 211. Since the dust inlet 211 extends in a ring shape along the circumference of the annular dust hood 20, the dust can enter the annular dust hood 20 from all directions, which is beneficial to improving the dust collection efficiency; the dust entering the annular dust hood 20 disperses and flows to each dust outlet 212, and enters the corresponding dust collection pipe 30 from the dust outlet 212. Since the dust outlet 212 is narrowed in the direction away from the dust inlet 211, the dust can be guided to quickly enter the dust collection pipe 30, thereby improving the dust collection efficiency. The number of dust outlets 212 is not limited. For example, the number of dust outlets 212 is four. Of course, in some other embodiments, the number of dust outlets 212 can be two, three, five or more than five.

[0035] In one embodiment, the plurality of dust outlets 212 may be evenly spaced along the circumference of the annular dust hood 20. The even distribution of the plurality of dust outlets 212 is conducive to evenly distributing the dust in the annular dust hood 20 to each dust collection pipe 30, thereby facilitating the dust collection efficiency.

[0036] In one embodiment, in combination Figure 2 and Figure 4As shown, the annular dust hood 20 includes a circular ring portion 213 and a plurality of conical portions 214, a dust inlet 211 is provided on the inner ring side of the circular ring portion 213, a plurality of conical portions 214 are spaced apart along the circumference of the circular ring portion 213, one end of the conical portion 214 is connected to the outer ring side of the circular ring portion 213, the other end of the conical portion 214 is connected to the dust suction pipe 30, a dust outlet 212 is formed in the conical portion 214, and the dust outlet 212 is connected to the inner cavity of the circular ring portion 213. It should be noted that the inner ring side of the circular ring portion 213 refers to the side of the circular ring portion 213 facing the rotary kiln 200 when the circular ring portion 213 is sleeved on the rotary kiln 200, and conversely, the outer ring side of the circular ring portion 213 refers to the side of the circular ring portion 213 facing away from the rotary kiln 200 when the circular ring portion 213 is sleeved on the rotary kiln 200. During operation, the dust ejected from the gap between the kiln tail 201 and the kiln tube 202 first enters the annular portion 213 from the dust inlet 211, and then dispersedly enters each conical portion 214. The larger end of the two ends of the conical portion 214 is connected to the outer ring side of the annular portion 213, and the smaller end of the two ends of the conical portion 214 is connected to the dust suction pipe 30. A conical dust outlet 212 is formed in the conical portion 214. The dust passes through the conical portion 214 and enters the corresponding dust suction pipe 30. The annular portion 213 has the advantages of simple structure and easy manufacturing, and has a regular shape, which is conducive to uniform distribution of dust to each conical portion 214, and the setting of the conical portion 214 facilitates the formation of a conical dust outlet 212.

[0037] In one embodiment, in combination Figure 2 and Figure 5 As shown, the annular dust hood 20 includes two semi-annular parts 24, and the two semi-annular parts 24 are detachably connected. The annular dust hood 20 is composed of two semi-annular parts 24, which can reduce the difficulty of manufacturing the annular dust hood 20 on the one hand, and on the other hand, it is convenient to clean the inner cavity of the annular dust hood 20 by disassembling the two semi-annular parts 24.

[0038] In one embodiment, Figure 5 As shown, both ends of the semi-circular portion 24 are provided with fixing plates 241, and the fixing plates 241 are provided with fixing holes 242. When the two semi-circular portions 24 are spliced, the fixing plates 241 of the two semi-circular portions 24 fit together, and the fixing holes 242 are aligned. During installation, the fixing holes 242 can be penetrated by screws to achieve the fixation of the two semi-circular portions 24, and the installation is very convenient.

[0039] In one embodiment, Figure 1As shown, one of the dust suction pipes 30 is connected to the bottom of the annular dust hood 20. Part of the dust in the annular dust hood 20 will be deposited at the bottom of the annular dust hood 20 under the action of gravity, and by connecting one of the multiple dust suction pipes 30 to the bottom of the annular dust hood 20, the dust deposited at the bottom of the annular dust hood 20 can be sucked away, thereby improving the dust recovery rate. Specifically, in the embodiment of the present application, the number of dust suction pipes 30 is four, and the four dust suction pipes 30 are respectively connected to the top, left side, right side and bottom of the annular dust hood 20.

[0040] In one embodiment, Figure 1 As shown, an adjusting air valve 40 is provided on the dust suction pipe 30. The different lengths of the dust suction pipes 30 may cause the problem of unbalanced vacuum degree of each dust suction pipe 30. By providing the adjusting air valve 40 on the dust suction pipe 30 to adjust the vacuum degree of the dust suction pipe 30, the vacuum degree of each dust suction pipe 30 can be balanced, so that the dust in the annular dust suction hood 20 can evenly enter each dust suction pipe 30, which is conducive to improving the dust collection efficiency. Specifically, the adjusting air valve 40 can be a wafer-type butterfly valve.

[0041] In one embodiment, Figure 1 As shown, the rotary kiln dust collecting device 100 further includes a collecting container 50 and a collecting pipe 60. One end of the dust collecting pipe 30 away from the annular dust collecting cover 20 is connected to the collecting container 50, and the collecting container 50 is connected to the dust collector 10 through the collecting pipe 60. During operation, the dust in the annular dust collecting cover 20 is dispersed into each dust collecting pipe 30, and the dust is collected in the collecting container 50 after passing through each dust collecting pipe 30, and then transported to the dust collector 10 through the collecting pipe 60. By providing the collecting container 50 and the collecting pipe 60, on the one hand, a buffering effect is played, and on the other hand, the length of the dust collecting pipe 30 can be shortened, so that the overall structure of the rotary kiln dust collecting device 100 is more concise.

[0042] In one embodiment, Figure 1 As shown, the collection pipe 60 is connected to the bottom of the collection container 50. Part of the dust entering the collection container 50 will be deposited at the bottom of the collection container 50 under the action of gravity, and by connecting the collection pipe 60 to the bottom of the collection container 50, the dust deposited at the bottom of the collection container 50 can be sucked away, thereby improving the dust recovery rate.

[0043] In one embodiment, Figure 1 As shown, the bottom of the collection container 50 is narrowed toward the collection pipe. By setting the bottom of the collection container 50 to be narrowed, the dust can be guided into the collection pipe 60, effectively preventing the dust from being deposited at the bottom of the collection container 50, and improving the dust recovery rate.

[0044] In one embodiment, a cleaning port is provided at the bottom of the collecting pipe 60. When the vacuum cleaner 10 stops working, the dust in the collecting pipe 60 will settle at the bottom of the collecting pipe 60 under the action of gravity. By providing a cleaning port at the bottom of the collecting pipe 60, the dust in the collecting pipe 60 can be taken out through the cleaning port.

[0045] In one embodiment, the rotary kiln dust suction device 100 further includes a cover, which is arranged at the cleaning port. During the dust suction operation, the cover blocks the cleaning port to prevent dust from being ejected from the cleaning port to the external environment. After the dust suction operation is completed, the cover is opened to remove the dust in the collecting pipe 60 from the cleaning port.

[0046] In one embodiment, Figure 1 As shown, the rotary kiln dust collection device 100 also includes a filter 70 and a recovery container 80. The dust collection pipe 30 is connected to the dust collector 10 through the filter 70. The recovery container 80 is arranged at the bottom of the filter 70. The dust intercepted by the filter 70 can fall into the recovery container 80. During operation, the dust is transported to the dust collector 10 along with the air in the dust collection pipe 30. When reaching the filter 70, the filter 70 can allow the air to pass through and intercept the dust. The air enters the dust collector 10 after passing through the filter 70, and then is discharged to the external environment. The dust intercepted by the filter 70 passes through the bottom of the filter 70 under the action of gravity and enters the recovery container 80, thereby realizing the separation of air and dust. Specifically, the dust collection pipe 30 is indirectly connected to the filter 70. A collection container 50 and a collection pipe 60 are also arranged between the dust collection pipe 30 and the filter 70. The dust collection pipe 30 is connected to the collection container 50, the collection container 50 is connected to the collection pipe 60, and the collection pipe 60 is connected to the filter 70.

[0047] like Figure 1 As shown, the embodiment of the present application also provides a rotary kiln system, including a rotary kiln 200 and the above-mentioned rotary kiln dust collection device 100, and the rotary kiln 200 includes a kiln tail 201 and a kiln barrel 202. The rotary kiln system provided by the embodiment of the present application adopts the above-mentioned rotary kiln dust collection device 100. When working, the dust collector 10 absorbs the air in the annular dust collection hood 20, and forms a negative pressure in the annular dust collection hood 20. The dust sprayed from the gap between the kiln tail 201 and the kiln barrel 202 of the rotary kiln 200 enters the annular dust collection hood 20, and then flows to the dust collector 10 along the dust collection pipe 30 with the air flow, so as to realize the collection of dust, effectively avoiding the environmental pollution and the increase of cleaning cost caused by the dust spraying into the external environment, and the number of the dust collection pipes 30 is multiple, and the multiple dust collection pipes 30 are distributed at intervals along the circumference of the annular dust collection hood 20, so that the dust entering the annular dust collection hood 20 can be dispersedly entered into each dust collection pipe 30, thereby improving the dust collection efficiency.

[0048] In one embodiment, in combination Figure 6 and Figure 7 As shown, the kiln tail 201 is sleeved on one end of the kiln barrel 202, and the kiln barrel 202 can rotate relative to the kiln tail 201. The annular dust hood 20 is sleeved on the kiln barrel 202 and fixed on the kiln tail 201, and an annular gap 300 is provided between the annular dust hood 20 and the kiln barrel 202. By reserving the annular gap 300 between the annular dust hood 20 and the kiln barrel 202, on the one hand, it is possible to avoid friction between the kiln barrel 202 and the annular dust hood 20 when rotating, and on the other hand, the inside of the rotary kiln 200 can be connected with the external environment through the annular gap 300, so that the gas pressure balance can be maintained.

[0049] Specifically, combined Figure 3 and Figure 7 As shown, the annular dust hood 20 includes a mounting plate portion 23, a connecting pipe portion 22 and an annular cover body portion 21 which are sequentially arranged in a direction away from the kiln tail 201. The mounting plate portion 23 is fixed on the kiln tail 201, and can be fixed by screws. One end of the connecting pipe portion 22 is fixed on the mounting plate portion 23, and the other end of the connecting pipe portion 22 is fixed on the annular cover body portion 21. An annular gap 300 is provided between the end of the annular cover body portion 21 away from the connecting pipe portion 22 and the kiln barrel 202. Specifically, the annular cover body portion 21 includes the above-mentioned annular portion 213 and a conical portion 214. It should be noted that there are gaps between the kiln tail 201 and the kiln barrel 202, the connecting pipe portion 22 and the kiln barrel 202, and the end of the annular cover body portion 21 connected to the connecting pipe portion 22 and the kiln barrel 202. The dust inside the rotary kiln 200 can pass through the above gaps and enter the annular cover body portion 21. There is an annular gap 300 between the end of the annular cover 21 away from the connecting pipe 22 and the kiln tube 202, which can prevent the kiln tube 202 from rubbing against the annular cover 21. At the same time, air in the external environment can enter the rotary kiln 200 through the annular gap 300 to maintain gas pressure balance. Specifically, the annular gap 300 can be selected to be 1.5 mm.

[0050] In one embodiment, Figure 7 As shown, the rotary kiln 200 further includes a packing gland 203 , which is fixed between the kiln tail 201 and the mounting plate 23 , and is used to compress the packing, thereby playing a sealing role between the kiln tail 201 and the kiln tube 202 .

[0051] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A rotary kiln dust collection device, characterized in that: include: Vacuum cleaner; An annular dust hood, which is used to be sleeved on the rotary kiln and is arranged corresponding to the gap between the kiln tail and the kiln tube of the rotary kiln; A plurality of dust suction pipes are distributed at intervals along the circumference of the annular dust suction hood, one end of the dust suction pipe is communicated with the inner cavity of the annular dust suction hood, and the other end of the dust suction pipe is connected to the vacuum cleaner.

2. The rotary kiln dust suction device according to claim 1, characterized in that: A dust inlet is provided on the inner ring side of the annular dust hood, and the dust inlet extends in a ring shape along the circumference of the annular dust hood. A plurality of dust outlets are provided on the outer ring side of the annular dust hood, and the plurality of dust outlets are distributed at intervals along the circumference of the annular dust hood and are connected to the plurality of dust pipes one by one, and the dust outlets are narrowed in the direction away from the dust inlet.

3. The rotary kiln dust suction device according to claim 2, characterized in that: The annular dust hood includes a circular portion and multiple conical portions, the dust inlet is provided on the inner ring side of the circular portion, the multiple conical portions are distributed at intervals along the circumference of the circular portion, one end of the conical portion is connected to the outer ring side of the circular portion, the other end of the conical portion is connected to the dust suction pipe, the dust outlet is formed in the conical portion, and the dust outlet is connected to the inner cavity of the circular portion.

4. The rotary kiln dust suction device according to any one of claims 1 to 3, characterized in that: The dust suction pipe is provided with an adjusting air valve.

5. The rotary kiln dust suction device according to any one of claims 1 to 3, characterized in that: The rotary kiln dust collection device also includes a collecting container and a collecting pipe. One end of the dust collection pipe away from the annular dust collection cover is connected to the collecting container, and the collecting container is connected to the dust collector through the collecting pipe.

6. The rotary kiln dust collection device according to claim 5, characterized in that: A cleaning port is provided at the bottom of the collecting pipe.

7. The rotary kiln dust suction device according to any one of claims 1 to 3, characterized in that: The rotary kiln dust collection device also includes a filter and a recovery container. The dust collection pipe is connected to the dust collector through the filter. The recovery container is arranged at the bottom of the filter. The dust intercepted by the filter can fall into the recovery container.

8. A rotary kiln system, characterized in that: The invention comprises a rotary kiln and a rotary kiln dust collecting device as claimed in any one of claims 1 to 7, wherein the rotary kiln comprises a kiln tail and a kiln tube.

9. The rotary kiln system according to claim 8, characterized in that: The kiln tail is sleeved on one end of the kiln cylinder, and the kiln cylinder can rotate relative to the kiln tail. The annular dust hood is sleeved on the kiln cylinder and fixed on the kiln tail, and an annular gap is provided between the annular dust hood and the kiln cylinder.

10. The rotary kiln system according to claim 9, characterized in that: The annular dust hood includes a mounting plate portion, a connecting pipe portion and an annular hood body portion which are sequentially arranged in a direction away from the kiln tail, the mounting plate portion is fixed to the kiln tail, one end of the connecting pipe portion is fixed to the mounting plate portion, and the other end of the connecting pipe portion is fixed to the annular hood body portion, and an annular gap is provided between one end of the annular hood body portion away from the connecting pipe portion and the kiln tube.

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