Smoke exhaust device of walking beam type heating furnace

Abstract

The utility model discloses a smoke exhaust device of a walking beam type heating furnace, which belongs to the technical field of metallurgical industry and comprises a chimney body, a flue is arranged on one side of the bottom of the chimney body, a first processing component is arranged above the flue and positioned at the bottom of the inner wall of the chimney body, and an air outlet end of an exhaust fan is communicated with a first partition plate. The first partition plate is arranged on the inner wall of the chimney body, a second partition plate is arranged above the first partition plate, a third partition plate is arranged above the second inclined plate, air outlet holes are formed in the third partition plate, second treatment assemblies are arranged on the two sides of the third partition plate, and the second treatment assemblies communicate with second flow guide assemblies. And the second flow guide assembly is arranged above the outer wall of the chimney body, a waterproof assembly is further arranged at the top of the inner wall of the chimney body, the situation that part of toxic and harmful substances contained in smoke are directly discharged into the atmosphere to cause certain damage to the environment can be avoided, and the waterproof assembly can prevent rainwater from entering the chimney body to affect the smoke discharging effect.

Description

Technical Field

[0001] The utility model belongs to the technical field of metallurgical industry, in particular to a smoke exhaust device of a walking beam type heating furnace. Background Art

[0002] The metallurgical industry refers to the industrial sector that mines, selects, sinters metal ores and smelts and processes them into metal materials. It is divided into: ferrous metallurgical industry, that is, the industrial sector that produces iron, chromium, manganese and their alloys, which mainly provides raw materials for modern industry, transportation, infrastructure and military equipment; non-ferrous metallurgical industry, that is, the metal refining industrial sector that produces non-ferrous metals, such as copper smelting industry, aluminum industry, lead and zinc industry, nickel and cobalt industry, tin smelting industry, precious metal industry, rare metal industry and other departments. In steel enterprises, heating furnaces are often used to smelt steel.

[0003] At present, some existing walking beam heating furnaces will generate a large amount of flue gas when in use. The flue gas passes through the air and gas preheating pipes and is discharged through the chimney. The flue gas contains some toxic and harmful substances (SO2, NOx, H2S, particulate matter, etc.). Direct discharge into the atmosphere will cause certain damage to the environment and may have a certain impact on people living nearby.

[0004] Therefore, the utility model provides a smoke exhaust device for a walking beam type heating furnace to solve the problems raised in the above background technology. Utility Model Content

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A smoke exhaust device for a walking beam heating furnace, comprising a chimney body, a flue is arranged on one side of the bottom of the chimney body, a first processing assembly is arranged above the flue, the first processing assembly is located at the bottom of the inner wall of the chimney body, first inclined plates are arranged on both sides of the bottom of the inner wall of the chimney body, a connecting pipe is arranged between two of the first inclined plates, the connecting pipe is connected to an air inlet end of an exhaust fan through a first connecting pipe, the exhaust fan is arranged on the inner wall of the chimney body, an air outlet end of the exhaust fan is connected to a first partition, the first partition is arranged on the inner wall of the chimney body, a second partition is arranged above the first partition, and a first flow guide assembly is arranged on the first partition;

[0007] Second connecting pipes are arranged on both sides of the second partition plate, and the two second connecting pipes are both connected to the second inclined plate through the second inclined plate, and the two second inclined plates are symmetrically arranged on the upper part of the inner wall of the chimney body, and a liquid collecting pipe is arranged between the two second inclined plates;

[0008] A third partition is arranged above the second inclined plate, an air outlet is arranged on the third partition, second processing components are arranged on both sides of the third partition, the second processing component is connected with a second flow guide component, and the second flow guide component is arranged above the outer wall of the chimney body;

[0009] A waterproof component is also arranged on the top of the inner wall of the chimney body.

[0010] Further solution: The first processing component includes a fixed block, a spring, a filter plate, a pull plate and bolts. The fixed block is arranged on one side of the inner wall of the bottom of the chimney body. The filter plate is slidably connected in the chimney body. A spring is clamped between the filter plate and the fixed block. The spring is fixedly connected to the fixed block. A pull plate is arranged on the side of the filter plate away from the fixed block, and a fastening bolt is arranged on the pull plate.

[0011] A further solution: The first diversion component includes a first water pump and a first water outlet pipe. The first water pump is arranged on the first partition. The water inlet of the first water pump is connected to the first water outlet pipe. One end of the first water outlet pipe passes through the inner wall of the chimney body. The water outlet of the first water pump is arranged between the first partition and the second partition.

[0012] A further solution: the water inlet end of the collecting pipe is arranged between the two second inclined plates, and the water outlet end of the collecting pipe penetrates the inner wall of the chimney body and is arranged on one side of the outer wall of the chimney body.

[0013] Further solution: The second processing component includes a first fixed box, a first protective box, a motor, a transmission rod, a first gear, a spray head and a second gear. The first fixed box is fixedly connected to the third partition plate, the motor is fixedly connected to the bottom of the inner wall of the first fixed box, the first protective box is arranged on the outside of the motor, the output end of the motor is fixedly connected to the transmission rod, the transmission rod is rotatably connected to the outside of the first fixed box, the outside of the transmission rod is fixedly connected to the first gear, the outside of the first gear is meshingly connected to the second gear, the spray head is fixedly connected to the second gear, the spray head is rotatably connected to the bottom of the first fixed box, and one side of the first fixed box is connected to the second guide component through a liquid outlet pipe.

[0014] A further solution: The second diversion assembly includes a second fixed box, a second water pump and a second water outlet pipe. The second fixed box is arranged on the outer wall of the chimney body. A second water pump is arranged in the second fixed box. The water inlet end of the second water pump is arranged in the second fixed box. The water outlet end of the second water pump is connected to the first fixed box through a liquid outlet pipe. A second water outlet pipe is arranged on one side of the second fixed box.

[0015] A further solution: the waterproof assembly includes a plurality of support rods and rain covers, wherein a plurality of the support rods are arranged above the chimney body, and a plurality of rain covers are arranged above the support rods.

[0016] A further solution is that a rain collecting trough is arranged in the middle of the rain cover, and the rain collecting trough is connected to a plurality of water flow troughs, and the plurality of water flow troughs are arranged on the rain cover in a circumferential direction.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] After the flue gas passes through the air and gas preheating pipes, the flue gas enters the chimney body through the flue. Under the action of the first processing component, the large particles in the flue gas are absorbed. After the absorption is completed, the exhaust fan is started at this time, and the air outlet end of the exhaust fan is introduced into the cavity formed by the first partition and the second partition, so that the water-soluble substances in the flue gas are absorbed by the moisture. The staff can replace and treat the moisture in the cavity formed by the first partition and the second partition through the first guide component. The smoke that has absorbed the moisture reaches the cavity formed by the third partition and the two second inclined plates through the second connecting pipe. The staff starts the second guide component to transport the treatment liquid to the inside of the second processing component, and the second processing component sprays the treatment liquid to absorb and treat the toxic and harmful substances in the flue gas. The treated flue gas is transported to the top of the chimney body through the air outlet, and the wastewater generated after the treatment is discharged to the outside by the collecting pipe, which can avoid the presence of some toxic and harmful substances in the flue gas. Direct discharge into the atmosphere will cause certain damage to the environment, and the waterproof component can prevent rainwater from entering the chimney body and affecting the emission effect of the flue gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to facilitate understanding by those skilled in the art, the present invention is further described below in conjunction with the accompanying drawings.

[0020] Figure 1 It is an overall structural diagram of a smoke exhaust device of a walking beam type heating furnace;

[0021] Figure 2 An overall structural cross-sectional view provided for an embodiment of the utility model;

[0022] Figure 3 for Figure 2 A schematic diagram of the enlarged structure of the middle A area;

[0023] Figure 4 A schematic diagram of the three-dimensional structure of a first processing component provided in an embodiment of the utility model;

[0024] Figure 5 for Figure 2 A schematic diagram of the structure of the middle B region;

[0025] Figure 6 for Figure 2 Schematic diagram of the enlarged structure of the middle C region.

[0026] In the figure: 1. chimney body; 2. flue;

[0027] 3. First processing assembly; 31. Fixed block; 32. Spring; 33. Filter plate; 34. Pull plate; 35. Bolt;

[0028] 4. First inclined plate; 5. Connecting pipe; 6. First connecting pipe; 7. Exhaust fan; 8. First partition plate; 9. Second partition plate;

[0029] 10. First flow guide assembly; 101. First water pump; 102. First water outlet pipe;

[0030] 11. second connecting pipe; 12. second inclined plate; 13. liquid collecting pipe; 14. third partition plate; 141. air outlet;

[0031] 15. Second processing assembly; 151. First fixed box; 152. First protective box; 153. Motor; 154. Transmission rod; 155. First gear; 156. Spray head; 157. Second gear; 16. Liquid outlet pipe;

[0032] 17. second flow guide assembly; 171. second fixed box; 172. second water pump; 173. second water outlet pipe;

[0033] 18. Waterproof assembly; 181. Support rod; 182. Rain cover; 1821. Rain collecting trough; 1822. Water flow trough. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model, that is, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the utility model provided in the accompanying drawings is not intended to limit the scope of the utility model claimed for protection, but merely represents selected embodiments of the utility model. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0036] See also Figures 1 to 6In an embodiment of the utility model, a smoke exhaust device of a walking beam type heating furnace comprises a chimney body 1, a flue 2 is arranged on one side of the bottom of the chimney body 1, a first processing component 3 is arranged above the flue 2, the first processing component 3 is located at the bottom of the inner wall of the chimney body 1, first inclined plates 4 are arranged on both sides of the bottom of the inner wall of the chimney body 1, a connecting pipe 5 is arranged between the two first inclined plates 4, the connecting pipe 5 is connected to the air inlet end of the exhaust fan 7 through the first connecting pipe 6, the exhaust fan 7 is arranged on the inner wall of the chimney body 1, the air outlet end of the exhaust fan 7 is connected to the first partition 8, the first partition 8 is arranged on the inner wall of the chimney body 1, a second partition 9 is arranged above the first partition 8, and a first guide component 10 is arranged on the first partition 8;

[0037] Second connecting pipes 11 are provided on both sides of the second partition plate 9, and the two second connecting pipes 11 are fixedly penetrated and connected with the second inclined plate 12 (one end of the second connecting pipe 11 is fixedly connected to the second partition plate 9, and the other end penetrates the inner wall of the second inclined plate 12, and is used to introduce the smoke filtered by the first partition plate 8 and the second partition plate 9 to the upper part of the chimney body 1 for spraying treatment by the second treatment component 15), and the two second inclined plates 12 are symmetrically arranged on the upper part of the inner wall of the chimney body 1, and a liquid collecting pipe 13 is arranged between the two second inclined plates 12;

[0038] A third partition plate 14 is arranged above the second inclined plate 12, and an air outlet 141 is arranged on the third partition plate 14. Second processing components 15 are arranged on both sides of the third partition plate 14. The second processing component 15 is connected to a second flow guide component 17 through a liquid outlet pipe 16. The second flow guide component 17 is arranged above the outer wall of the chimney body 1, and a waterproof component 18 is also arranged on the top of the inner wall of the chimney body 1.

[0039] After the flue gas passes through the air and gas preheating pipeline, the flue 2 gate is opened, and the flue gas enters the chimney body 1 through the flue 2. Under the action of the first processing component 3, the large particulate matter in the flue gas is absorbed. After the flue gas is absorbed by the first processing component 3, the exhaust fan 7 is started at this time, and the flue gas is introduced into the first connecting pipe 6 through the connecting pipe 5 between the two first inclined plates 4, and is introduced into the air inlet end of the exhaust fan 7 by the first connecting pipe 6, and is introduced into the cavity formed by the first partition 8 and the second partition 9 by the air outlet end of the exhaust fan 7. At this time, the cavity formed by the first partition 8 and the second partition 9 is filled with moisture sucked from the external environment by the first guide component 10, so that the water-soluble substances in the flue gas are absorbed by the moisture. The staff can use the first guide component 10 to adjust the first partition 8 and the second partition 9 The moisture in the formed cavity is replaced and treated, and the flue gas that has absorbed the moisture reaches the cavity formed by the third partition 14 and the two second inclined plates 12 through the second connecting pipe 11. The staff starts the second guide component 17 to transport the treatment liquid to the inside of the second treatment component 15, and the second treatment component 15 sprays the toxic and harmful substances in the flue gas in the cavity formed by the third partition 14 and the two second inclined plates 12. The treated flue gas is transported to the top of the chimney body 1 through the air outlet 141, and the wastewater generated after the treatment is discharged to the outside by the collecting pipe 13, which can avoid the presence of some toxic and harmful substances in the flue gas, and directly discharge it into the atmosphere will cause certain damage to the environment, and the waterproof component 18 can prevent rainwater from entering the chimney body 1 and affecting the emission effect of the flue gas.

[0040] In one embodiment, see Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the first processing component 3 includes a fixing block 31, a spring 32, a filter plate 33, a pull plate 34 and a bolt 35. The fixing block 31 is arranged at one side of the inner wall at the bottom of the chimney body 1. The filter plate 33 is slidably connected in the chimney body 1. A spring 32 is clamped between the filter plate 33 and the fixing block 31. The spring 32 is fixedly connected to the fixing block 31. A pull plate 34 is arranged on the side of the filter plate 33 away from the fixing block 31. A fastening bolt 35 is arranged on the pull plate 34. In the installed state, the filter plate 33 slides to the installation position and squeezes the spring 32 fixed on the fixing block 31. The spring 32 is clamped between the fixing block 31 and the filter plate 33. Then, the pull plate 34 is fixed to one side of the outer wall of the chimney body 1 by the bolt 35. When the filter plate 33 is used for a long time, the staff rotates the bolt 35 so that the bolt 35 is disengaged from the inside of the chimney body 1. Under the elastic force of the spring 32, the filter plate 33 is ejected. The staff pulls the pull plate 34 to take out the filter plate 33 for cleaning or replacement.

[0041] In one embodiment, see Figure 1 and Figure 2As shown, the first guide component 10 includes a first water pump 101 and a first water outlet pipe 102. The first water pump 101 is arranged on the first partition 8. The water inlet of the first water pump 101 is connected to the first water outlet pipe 102. One end of the first water outlet pipe 102 passes through the inner wall of the chimney body 1. The water outlet of the first water pump 101 is arranged between the first partition 8 and the second partition 9. When the first water pump 101 is started, the external water flow is introduced into the water inlet of the first water pump 101 through the first water outlet pipe 102, and then introduced into the cavity formed between the first partition 8 and the second partition 9 through the water outlet of the first water pump 101, so as to absorb and filter the smoke passing through the first partition 8 and the second partition 9.

[0042] In one embodiment, see Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, the second processing assembly 15 includes a first fixed box 151, a first protective box 152, a motor 153, a transmission rod 154, a first gear 155, a spray head 156 and a second gear 157. The first fixed box 151 is fixedly connected to the third partition plate 14. The motor 153 is fixedly connected to the bottom of the inner wall of the first fixed box 151. The first protective box 152 is arranged on the outside of the motor 153. The output end of the motor 153 is fixedly connected to the transmission rod 154. The transmission rod 154 is rotatably connected to the outside of the first fixed box 151. The first gear 155 is fixedly connected to the outside of the first gear 155. The second gear 157 is meshed and connected to the outside of the first gear 155. The spray head 156 is fixedly connected to the second gear 157. The spray head 156 is rotatably connected to the first fixed box 151. At the bottom of the box 151, one side of the first fixed box 151 is connected to the second guide component 17 through the liquid outlet pipe 16. When it is necessary to process the flue gas introduced by the second connecting pipe 11 into the cavity formed by the third partition plate 14 and the two second inclined plates 12 again, the second guide component 17 is started to introduce the treated liquid from the liquid outlet pipe 16 into the first fixed box 151, and the motor 153 is started to drive the transmission rod 154 to rotate, and the rotation of the transmission rod 154 drives the first gear 155 to rotate, and the rotation of the first gear 155 drives the second gear 157 to rotate, thereby driving the spray head 156 to rotate outside the first fixed box 151 to evenly spray the treated liquid, and the treated flue gas is transported to the top of the chimney body 1 through the air outlet 141, and the wastewater generated after treatment is discharged to the outside by the liquid collecting pipe 13.

[0043] In one embodiment, see Figure 1 and Figure 2As shown, the second guide component 17 includes a second fixed box 171, a second water pump 172 and a second water outlet pipe 173. The second fixed box 171 is arranged on the outer wall of the chimney body 1, and the second water pump 172 is arranged in the second fixed box 171. The water inlet end of the second water pump 172 is arranged in the second fixed box 171, and the water outlet end of the second water pump 172 is connected to the first fixed box 151 through the liquid outlet pipe 16. A second water outlet pipe 173 is arranged on one side of the second fixed box 171. When the second water pump 172 is started, the treatment liquid in the second water outlet pipe 173 is introduced into the second fixed box 171, and then sucked by the water inlet end of the second water pump 172, and then introduced into the liquid outlet pipe 16 by the water outlet end of the second water pump 172, and then introduced into the first fixed box 151 by the liquid outlet pipe 16 for spraying and treatment by the second treatment component 15.

[0044] In one embodiment, see Figure 1 and Figure 2 As shown, the waterproof component 18 includes a plurality of support rods 181 and a rain cover 182. The plurality of support rods 181 are arranged above the chimney body 1, and a rain cover 182 is arranged above the plurality of support rods 181. The rain cover 182 is arranged above the chimney body 1 to prevent external rainwater from entering the chimney body 1 and affecting the emission of smoke.

[0045] In one embodiment, see Figure 1 and Figure 2 As shown, a rain collecting trough 1821 is provided in the middle of the rain cover 182, and the rain collecting trough 1821 is connected to a plurality of water flow troughs 1822, and the plurality of water flow troughs 1822 are arranged in a circular direction on the rain cover 182. Rainwater is introduced into each water flow trough 1822 through the rain collecting trough 1821, and then discharged to the outside of the chimney body 1 by each water flow trough 1822.

[0046] The present invention is limited only by the claims and their full scope and equivalents. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0047] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", etc. 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, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] The above contents are merely examples and explanations of the structure of the utility model. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the utility model or exceed the scope defined in the claims, they should all fall within the protection scope of the utility model.

Claims

1. A smoke exhaust device for a walking beam heating furnace, comprising a chimney body (1), characterized in that: A flue (2) is provided at one side of the bottom of the chimney body (1), a first processing assembly (3) is provided above the flue (2), the first processing assembly (3) is located at the bottom of the inner wall of the chimney body (1), first inclined plates (4) are provided on both sides of the bottom of the inner wall of the chimney body (1), a connecting pipe (5) is provided between the two first inclined plates (4), the connecting pipe (5) is connected to the air inlet end of an exhaust fan (7) through a first connecting pipe (6), the exhaust fan (7) is provided on the inner wall of the chimney body (1), the air outlet end of the exhaust fan (7) is connected to a first partition (8), the first partition (8) is provided on the inner wall of the chimney body (1), a second partition (9) is provided above the first partition (8), and a first flow guide assembly (10) is provided on the first partition (8); Second connecting pipes (11) are provided on both sides of the second partition plate (9), the two second connecting pipes (11) are fixedly penetrated and connected with second inclined plates (12), the two second inclined plates (12) are symmetrically arranged on the upper part of the inner wall of the chimney body (1), and a liquid collecting pipe (13) is arranged between the two second inclined plates (12); A third partition plate (14) is arranged above the second inclined plate (12), an air outlet hole (141) is arranged on the third partition plate (14), second processing components (15) are arranged on both sides of the third partition plate (14), the second processing component (15) is connected to a second flow guide component (17) through a liquid outlet pipe (16), and the second flow guide component (17) is arranged above the outer wall of the chimney body (1); A waterproof component (18) is also provided on the top of the inner wall of the chimney body (1).

2. The smoke exhaust device of a walking beam heating furnace according to claim 1, characterized in that: The first processing assembly (3) comprises a fixed block (31), a spring (32), a filter plate (33), a pull plate (34) and a bolt (35); the fixed block (31) is arranged on one side of the inner wall at the bottom of the chimney body (1); the filter plate (33) is slidably connected in the chimney body (1); a spring (32) is clamped between the filter plate (33) and the fixed block (31); the spring (32) is fixedly connected to the fixed block (31); a pull plate (34) is arranged on the side of the filter plate (33) away from the fixed block (31); and a fastening bolt (35) is arranged on the pull plate (34).

3. The smoke exhaust device of a walking beam heating furnace according to claim 1, characterized in that: The first flow guide component (10) comprises a first water pump (101) and a first water outlet pipe (102); the first water pump (101) is arranged on a first partition plate (8); a water inlet of the first water pump (101) is connected to the first water outlet pipe (102); one end of the first water outlet pipe (102) passes through the inner wall of the chimney body (1); and the water outlet of the first water pump (101) is arranged between the first partition plate (8) and the second partition plate (9).

4. The smoke exhaust device of a walking beam heating furnace according to claim 1, characterized in that: The water inlet end of the liquid collecting pipe (13) is arranged between the two second inclined plates (12), and the water outlet end of the liquid collecting pipe (13) penetrates the inner wall of one side of the chimney body (1).

5. The smoke exhaust device of a walking beam heating furnace according to claim 1, characterized in that: The second processing assembly (15) comprises a first fixed box (151), a first protective box (152), a motor (153), a transmission rod (154), a first gear (155), a spray head (156) and a second gear (157); the first fixed box (151) is fixedly connected to the third partition plate (14); the bottom of the inner wall of the first fixed box (151) is fixedly connected to the motor (153); the outer side of the motor (153) is provided with the first protective box (152); the output end of the motor (153) is fixedly connected to the transmission rod (154); A transmission rod (154) is rotatably connected to the outside of a first fixed box (151); a first gear (155) is fixedly connected to the outside of the transmission rod (154); a second gear (157) is meshingly connected to the outside of the first gear (155); a spray head (156) is fixedly connected to the second gear (157); the spray head (156) is rotatably connected to the bottom of the first fixed box (151); and a second flow guide component (17) is connected to one side of the first fixed box (151) through a liquid outlet pipe (16).

6. The smoke exhaust device of a walking beam heating furnace according to claim 1, characterized in that: The second flow guide component (17) comprises a second fixed box (171), a second water pump (172) and a second water outlet pipe (173); the second fixed box (171) is arranged on the outer wall of the chimney body (1); the second water pump (172) is arranged in the second fixed box (171); the water inlet end of the second water pump (172) is arranged in the second fixed box (171); the water outlet end of the second water pump (172) is connected to the first fixed box (151) through the liquid outlet pipe (16); and the second water outlet pipe (173) is arranged on one side of the second fixed box (171).

7. The smoke exhaust device of a walking beam heating furnace according to claim 1, characterized in that: The waterproof assembly (18) comprises a plurality of support rods (181) and rain covers (182); a plurality of the support rods (181) are arranged above the chimney body (1); and a plurality of the support rods (181) are provided with rain covers (182) above them.

8. The smoke exhaust device of a walking beam heating furnace according to claim 7, characterized in that: A rain collecting trough (1821) is arranged in the middle of the rain cover (182), and the rain collecting trough (1821) is connected to a plurality of water flow troughs (1822), and the plurality of water flow troughs (1822) are arranged on the rain cover (182) in a circumferential direction.

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