A cobalt carbonate raw material production drying equipment

Abstract

This invention relates to a drying equipment for cobalt carbonate raw material production in the field of mineral processing, comprising a pre-drying chamber, a re-drying chamber, and a spray chamber. A spray disc is rotatably mounted on the inner side of the spray chamber, and a concentrating air cover is slidably fitted onto the lower side of the spray disc. A first jet pipe connected to a high-pressure hot air device is fixedly connected to the concentrating air cover. This design allows the spray disc to maintain its rotation during operation. High-pressure hot air sprayed upwards from the concentrating air cover passes through the spray disc, clearing any blockages. The high-pressure hot air entering the pre-drying chamber pre-dries the material within. Larger particles blown upwards from the spray disc by the high-pressure hot air can return to the pre-drying chamber for further drying. Then, the material is blown downwards from the spray disc, evenly dispersing it in the re-drying chamber, where it continues to receive high-pressure hot air drying treatment. This results in better drying performance and eliminates the need for machine shutdown and spray disc cleaning, leading to higher operational efficiency.

Description

Technical Field

[0001] The invention relates to drying equipment, in particular to cobalt carbonate raw material production drying equipment applied to the field of mineral processing. Background Art

[0002] Cobalt carbonate is an important chemical raw material, widely used in batteries, pigments, ceramics and other industries. The cobalt carbonate raw material needs to go through a drying process during the production process to remove moisture from the raw material and improve its quality and storage stability.

[0003] A more refined and efficient method is to use spray drying, which can obtain cobalt carbonate powder with a more uniform particle size, and has both drying and crushing effects, which can reduce the time cost of preparation. For example, a cobalt carbonate production device disclosed in patent publication number CN117680074A includes a reactor, a mixing bin, a screw feeder and a spray drying device. Raw materials for preparing cobalt carbonate are added to the reactor to precipitate and prepare cobalt carbonate. A discharge port is set at the bottom of the reactor and is connected to the mixing bin through a pipeline. A gear set and a mixing roller are provided in the mixing bin. The gear set pumps the precipitate mixed with the reaction solution discharged from the reactor into the mixing bin through high-speed rotation. The mixing roller rolls and mixes the pumped precipitate. The end of the mixing bin is connected to the screw feeder through a pipeline. The screw feeder mixes the precipitate rolled by the mixing roller evenly. The spray drying device includes a spray part and a drying part. The spray part sprays the precipitate discharged from the screw feeder into the drying part, and the drying part dries the sprayed atomized precipitate.

[0004] Based on the above search and in combination with the prior art, it is found that when the existing cobalt carbonate raw material production drying equipment sprays materials, the nozzle is easily clogged by the material and needs to be stopped for processing, which is troublesome and reduces the operating efficiency. Therefore, a cobalt carbonate raw material production drying equipment is proposed to improve the above problems. Summary of the invention

[0005] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that when the existing cobalt carbonate raw material production drying equipment sprays materials, the nozzle is easily blocked by the materials, and the equipment needs to be shut down for processing, which is troublesome and reduces the operating efficiency.

[0006] In order to solve the above problems, the present invention provides a cobalt carbonate raw material production drying equipment, comprising:

[0007] A pre-drying bin, the upper end of which is provided with a feed inlet;

[0008] A re-drying bin, which is located at the lower side of the pre-drying bin and has a discharge port at the lower end thereof;

[0009] The spray chamber is fixed between the pre-drying chamber and the re-drying chamber, and a spray disc is installed inside the spray chamber;

[0010] The spray disc is disc-shaped and horizontally rotatably mounted on the inner side of the spray bin. A wind collecting shell cover is slidably fitted on the lower side of the spray disc. A first jet pipe is fixedly connected to the wind collecting shell cover. The first jet pipe runs through the re-drying bin. A high-pressure hot air device is mounted on the end of the first jet pipe located outside the re-drying bin.

[0011] The wind collecting shell cover is a shape formed by the combination of two radii forming an acute angle of the spray disc and the circumference of the circle where they are located.

[0012] In the above-mentioned cobalt carbonate raw material production drying equipment, the spray plate keeps rotating during the operation, and high-pressure hot air is sprayed upward through the first jet pipe in cooperation with the wind gathering shell cover. The high-pressure hot air passes through the spray plate from bottom to top, which can play a bottom-up dredging role on the spray plate. The high-pressure hot air entering the pre-drying bin pre-dries the material in the pre-drying bin, and the larger particle material blown out of the spray plate from bottom to top by the high-pressure hot air can return to the pre-drying bin for drying again, and then blown out from top to bottom through the spray plate, so that the material is evenly dispersed in the re-drying bin, and continues to be dried by the high-pressure hot air in the re-drying bin, so that the drying effect is better, and there is no need to stop the machine to clean the spray plate, and the operation efficiency is higher.

[0013] As a further supplement to the present application, a rotating shaft is vertically fixed at the center of the upper end of the spray disc, and a wind transmission mechanism is arranged between the rotating shaft and the wind gathering shell cover. When the first jet pipe sprays through the wind gathering shell cover, the spray disc is rotated by the wind transmission mechanism and the rotating shaft.

[0014] As a further supplement to the present application, the wind power transmission mechanism includes a transmission assembly and a blade;

[0015] The wheel blade is located on the upper side of the spray disc and on the upper side of the wind collecting shell cover 1, and the wheel blade is vertically rotatably installed on the inner side of the spray bin, and the wheel blade is connected with the rotating shaft through a transmission component.

[0016] As a further supplement to the present application, the transmission assembly includes a transmission gear 1 and a transmission gear 2 meshing with each other;

[0017] The transmission gear 1 is fixed coaxially with the wheel blade, and the transmission gear 2 is fixed coaxially with the rotating shaft. The high-pressure hot air is sprayed upward through the first jet pipe in cooperation with the wind collecting shell cover 1. The high-pressure hot air blows the wheel blade after passing through the spray disc from bottom to top. Under the meshing action of the transmission gear 1 and the transmission gear 2, the rotating shaft rotates with the spray disc, and there is no need to add additional driving equipment to make the spray disc rotate, which is more energy-saving.

[0018] As a further supplement to the present application, an air gathering ring is installed on the inner side of the spray bin, and the air gathering ring is slidably fitted on the upper end surface of the spray disc, and the air gathering ring is sleeved on the outer side of the blade; the air gathering ring can make the high-pressure hot air sprayed upward gather on the inner side of the air gathering ring, so as to stably blow the blade;

[0019] A windshield is coaxially arranged on the lower side of the transmission gear 1, which is fixed to the side end of the spray bin and has a diameter larger than the diameter of the transmission gear 1; this can prevent the high-pressure hot air blown from bottom to top from directly impacting the transmission gear 1 and causing excessive torque on the rotation of the impeller.

[0020] As a further supplement to the present application, a plurality of first sieve plates are installed equidistantly from top to bottom on the inner side of the pre-drying bin, and a plurality of second sieve plates are installed equidistantly from top to bottom on the inner side of the re-drying bin; both the first sieve plates and the second sieve plates are helpful in dispersing the material.

[0021] As a further supplement to the present application, mixing rods are slidably fitted on the upper and lower sides of the first screen plate, and multiple mixing rods are installed on the side ends of the rotating shaft; the mixing rods rotate with the rotating shaft, and can cooperate with the first screen plate to exert a certain shearing effect on the material, especially for larger particle materials blown out of the spray plate from bottom to top by high-pressure hot air, which can further improve the dispersion effect of the material, thereby improving the drying effect.

[0022] As a further supplement to the present application, the sieve holes on two adjacent second sieve plates are staggered to extend the passage path of the material, thereby improving the drying effect.

[0023] As another improvement of the present application, a second air collecting shell cover is slidably fitted on the upper side of the spray disc, and a second air injection pipe is fixedly connected to the second air collecting shell cover, and the second air injection pipe passes through the pre-drying chamber and is connected to the high-pressure hot air device;

[0024] The second wind gathering shell cover is also a shape formed by the combination of two radii of the spray disc that form an acute angle and the circumference of the circle on which they are located; high-pressure hot air is blown out through the second jet pipe in cooperation with the second wind gathering shell cover, and the high-pressure hot air passes through the spray disc from top to bottom. Compared with the high-pressure hot air that passes through the spray disc from top to bottom through the pre-drying chamber, the high-pressure hot air that passes through the spray disc from top to bottom through the second wind gathering shell cover has a relatively higher pressure, and can better clear the spray disc from top to bottom.

[0025] As another improvement supplement to the present application, the second wind gathering shell cover is arranged adjacent to the first wind gathering shell cover, and the second wind gathering shell cover is located on the side of the first wind gathering shell cover facing away from the rotation direction of the spray disk; the second wind gathering shell cover can blow the material that is in the spray disk but has not passed through the spray disk in time downward, and at the same time can prevent the material from continuing to enter the spray disk, playing a transition role, and preventing the first wind gathering shell cover from blowing the material that is in the spray disk but has not passed through the spray disk back into the pre-drying bin again.

[0026] In summary, the present invention provides a cobalt carbonate raw material production drying device, which has the following beneficial effects:

[0027] The high-pressure hot air is sprayed upward through the first jet pipe in cooperation with the wind-gathering shell cover 1, and the high-pressure hot air passes through the spray disc from bottom to top and blows the wheel blades. Under the meshing action of the transmission gear 1 and the transmission gear 2, the rotating shaft rotates with the spray disc. At the same time, the high-pressure hot air sprayed upward through the first jet pipe in cooperation with the wind-gathering shell cover 1 passes through the spray disc, which can play a role of dredging the spray disc from bottom to top. The high-pressure hot air entering the pre-drying bin pre-dries the material in the pre-drying bin, and the larger particles of material blown out of the spray disc from bottom to top by the high-pressure hot air can return to the pre-drying bin for drying again; because the mixing rod rotates with the rotating shaft, it can cooperate with the first screen plate to play a certain shearing effect on the material, especially for the High-pressure hot air blows out larger particles of material from the spray plate from bottom to top, which can further improve the dispersion effect of the material, thereby improving the drying effect. Then it is blown out from top to bottom through the spray plate, so that the material is evenly dispersed in the re-drying bin and continues to be dried by the high-pressure hot air in the re-drying bin. At the same time, high-pressure hot air is blown out through the second jet pipe in cooperation with the second wind gathering shell cover, and the high-pressure hot air passes through the spray plate from top to bottom. Compared with the high-pressure hot air passing through the spray plate from top to bottom through the pre-drying bin, the high-pressure hot air passing through the spray plate from top to bottom through the second wind gathering shell cover has a relatively higher pressure, which can better dredge the spray plate from top to bottom, and at the same time can further improve the drying effect, without the need to stop the machine to clean the spray plate, and the operating efficiency is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the first embodiment of the present application;

[0029] Figure 2 This is a schematic cross-sectional view of the first embodiment of the present application;

[0030] Figure 3 This is a schematic diagram of the planar structure of the pre-drying chamber in the first embodiment of the present application;

[0031] Figure 4 This is a schematic diagram of the three-dimensional structure of the wind power transmission mechanism of the first embodiment of the present application;

[0032] Figure 5 The three-dimensional structure of the spray plate of the first embodiment of the present application is shown in FIG. Figure 1 ;

[0033] Figure 6 The three-dimensional structure of the spray plate of the first embodiment of the present application is shown in FIG. Figure 2 ;

[0034] Figure 7 This is a schematic diagram of the side structure of the spray plate of the first embodiment of the present application;

[0035] Figure 8 This is a top perspective view of the first embodiment of the present application.

[0036] Description of the numbers in the figure:

[0037] 1. Pre-drying chamber; 101. Feeding port; 2. Re-drying chamber; 201. Discharging port; 3. Spraying chamber; 4. Spraying disc; 5. First jetting pipe; 6. Wind collecting shell cover 1; 7. Impeller; 8. Transmission gear 1; 9. Transmission gear 2; 10. Rotating shaft; 11. Mixing rod; 12. First sieve plate; 13. Second sieve plate; 14. Second jetting pipe; 15. Wind collecting shell cover 2; 16. Wind collecting ring; 17. Wind shield. DETAILED DESCRIPTION

[0038] The following describes two implementation modes of the present application in detail with reference to the accompanying drawings.

[0039] The first implementation method:

[0040] The present invention provides a cobalt carbonate raw material production drying equipment, please refer to Figure 1-Figure 6 , including a pre-drying chamber 1, a re-drying chamber 2 and a spraying chamber 3.

[0041] Among them, a feed port 101 is provided at the upper end of the pre-drying bin 1, the re-drying bin 2 is located at the lower side of the pre-drying bin 1, and a discharge port 201 is provided at the lower end of the re-drying bin 2, the spray bin 3 is fixed between the pre-drying bin 1 and the re-drying bin 2, and a spray disc 4 is installed on the inner side of the spray bin 3.

[0042] Regarding the spray disc 4, specifically, the spray disc 4 is disc-shaped, and the spray disc 4 is horizontally rotatably installed on the inner side of the spray bin 3, and a wind gathering shell cover 6 is slidably fitted on the lower side of the spray disc 4. The wind gathering shell cover 6 is fixedly connected with a first jet pipe 5, and the first jet pipe 5 passes through the re-drying bin 2. A high-pressure hot air device (not shown in the figure) is installed at the end of the first jet pipe 5 located on the outer side of the re-drying bin 2, and the wind gathering shell cover 6 is a shape formed by the combination of two radii forming an acute angle of the spray disc 4 and the circumference thereof.

[0043] When the cobalt carbonate raw material production drying equipment is in operation, the spray disc 4 keeps rotating during the operation, and high-pressure hot air is sprayed upward through the first jet pipe 5 in cooperation with the wind gathering shell cover 6. The high-pressure hot air passes through the spray disc 4 from bottom to top, and can play a bottom-up dredging role on the spray disc 4. The high-pressure hot air entering the pre-drying bin 1 pre-dries the material in the pre-drying bin 1, and the larger particles of material blown out of the spray disc 4 from bottom to top by the high-pressure hot air can return to the pre-drying bin 1 for drying again, and then blown out from top to bottom through the spray disc 4, so that the material is evenly dispersed in the re-drying bin 2, and continues to be dried by the high-pressure hot air in the re-drying bin 2, so that the drying effect is better, and there is no need to stop the machine to clean the spray disc 4, and the operation efficiency is higher.

[0044] Furthermore, a rotating shaft 10 is vertically fixed at the center of the upper end of the spray disc 4, and a wind transmission mechanism is provided between the rotating shaft 10 and the wind gathering shell 6. When the first jet pipe 5 sprays through the wind gathering shell 6, the spray disc 4 is rotated by the wind transmission mechanism and the rotating shaft 10.

[0045] Among them, regarding the wind power transmission mechanism, specifically, Figure 2-Figure 6 As shown, the wind transmission mechanism includes a transmission assembly and a wheel blade 7. The wheel blade 7 is located on the upper side of the spray disc 4 and on the upper side of the wind collecting shell cover 6. The wheel blade 7 is vertically rotatably installed on the inner side of the spray bin 3. The wheel blade 7 is connected to the rotating shaft 10 through the transmission assembly. The transmission assembly includes a meshing transmission gear 1 8 and a transmission gear 2 9. The transmission gear 1 8 is coaxially fixed to the wheel blade 7, and the transmission gear 2 9 is coaxially fixed to the rotating shaft 10.

[0046] Based on the coordinated arrangement of the above structure, high-pressure hot air is sprayed upward through the first jet pipe 5 in cooperation with the wind-collecting shell cover 6. The high-pressure hot air passes through the spray disc 4 from bottom to top and blows the wheel blades 7. Under the meshing action of the transmission gear 1 8 and the transmission gear 2 9, the rotating shaft 10 makes the spray disc 4 rotate. There is no need to add additional driving equipment to make the spray disc 4 rotate, which is more energy-saving.

[0047] Among them, a wind focusing ring 16 is installed on the inner side of the spray chamber 3, and the wind focusing ring 16 is slidably fitted on the upper end surface of the spray disc 4, and the wind focusing ring 16 is sleeved on the outer side of the blade 7. The wind focusing ring 16 can make the high-pressure hot air sprayed upward gather on the inner side of the wind focusing ring 16, thereby stably blowing the blade 7.

[0048] A windshield 17 is coaxially arranged on the lower side of the transmission gear 8. The windshield 17 is fixed to the side end of the spray bin 3, and the diameter of the windshield 17 is larger than the diameter of the transmission gear 8, which can prevent the high-pressure hot air blown from bottom to top from directly impacting the transmission gear 8 and causing excessive torque on the rotation of the impeller 7.

[0049] Among them, a plurality of first sieve plates 12 are installed equidistantly from top to bottom on the inner side of the pre-drying bin 1, and a plurality of second sieve plates 13 are installed equidistantly from top to bottom on the inner side of the re-drying bin 2; both the first sieve plates 12 and the second sieve plates 13 are helpful for dispersing the materials.

[0050] Mixing rods 11 are slidably mounted on both upper and lower sides of the first screen plate 12 , and a plurality of mixing rods 11 are mounted on the side ends of the rotating shaft 10 .

[0051] Based on the coordinated arrangement of the above structure, the mixing rod 11 rotates with the rotating shaft 10, and can cooperate with the first screen plate 12 to exert a certain shearing effect on the material, especially for larger particle materials blown out of the spray disc 4 from bottom to top by high-pressure hot air, which can further improve the dispersion effect of the material and thus improve the drying effect.

[0052] The sieve holes on two adjacent second sieve plates 13 are arranged in a staggered manner. This design can extend the passage path of the material, thereby improving the drying effect.

[0053] Working principle: The high-pressure hot air is sprayed upward through the high-pressure hot air device and the first jet pipe 5 in cooperation with the wind-gathering shell 6. The high-pressure hot air passes through the spray plate 4 from bottom to top and blows the wheel blade 7. Under the meshing action of the transmission gear 1 8 and the transmission gear 2 9, the rotating shaft 10 rotates with the spray plate 4. At the same time, the high-pressure hot air sprayed upward through the first jet pipe 5 in cooperation with the wind-gathering shell 6 passes through the spray plate 4, which can play a role in dredging the spray plate 4 from bottom to top. The high-pressure hot air entering the pre-drying bin 1 pre-dries the material in the pre-drying bin 1, and is blown out of the spray plate 4 from bottom to top by the high-pressure hot air. Large particle materials can return to the pre-drying bin 1 for drying again; since the mixing rod 11 rotates with the rotating shaft 10, it can cooperate with the first screen plate 12 to play a certain shearing effect on the material, especially for larger particle materials blown out of the spray disc 4 from bottom to top by the high-pressure hot air, the dispersion effect of the material can be further improved, thereby improving the drying effect, and then blown out from top to bottom through the spray disc 4, so that the material is evenly dispersed in the re-drying bin 2, and continues to receive the drying treatment of the high-pressure hot air in the re-drying bin 2, which can further improve the drying effect, and there is no need to stop the machine to clean the spray disc 4, and the operation efficiency is higher.

[0054] Second implementation method:

[0055] This embodiment is based on the embodiment 1, and the following structure is added, so that the present application has a better dredging effect on the spray plate 4, and the specific configuration is as follows: Figure 1-Figure 8As shown, a second wind gathering shell cover 15 is slidably fitted on the upper side of the spray disc 4, and a second air injection pipe 14 is fixedly connected to the second wind gathering shell cover 15. The second air injection pipe 14 passes through the pre-drying chamber 1 and is connected to a high-pressure hot air device (not shown in the figure). The second wind gathering shell cover 15 is also a shape formed by the combination of two radii forming an acute angle of the spray disc 4 and the circumference thereof.

[0056] High-pressure hot air is blown out through the second jet pipe 14 in cooperation with the wind gathering shell 15, and passes through the spray plate 4 from top to bottom. Compared with the high-pressure hot air passing through the spray plate 4 from top to bottom through the pre-drying chamber 1, the high-pressure hot air passing through the spray plate 4 from top to bottom through the wind gathering shell 15 has a relatively higher pressure, and can better clear the spray plate 4 from top to bottom.

[0057] Among them, Figure 5 and Figure 8 As shown, the wind gathering shell cover 2 15 is arranged adjacent to the wind gathering shell cover 1 6, and the wind gathering shell cover 2 15 is arranged on the side of the wind gathering shell cover 1 6 facing away from the rotation direction of the spray disc 4; the wind gathering shell cover 2 15 can blow out downward the materials that are located in the spray disc 4 but have not passed through the spray disc 4, and at the same time can prevent the materials from continuing to enter the spray disc 4, playing a transition role, preventing the wind gathering shell cover 1 6 from blowing the materials that are located in the spray disc 4 but have not passed through the spray disc 4 back into the pre-drying bin 1 again.

[0058] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. A cobalt carbonate raw material production drying equipment, characterized in that: include: A pre-drying bin (1), wherein a feed inlet (101) is provided at an upper end of the pre-drying bin (1); A re-drying bin (2), the re-drying bin (2) being located at the lower side of the pre-drying bin (1), and a discharge port (201) being provided at the lower end of the re-drying bin (2); A spray bin (3), the spray bin (3) being fixed between the pre-drying bin (1) and the re-drying bin (2), and a spray disc (4) being installed inside the spray bin (3); The spray disc (4) is disc-shaped and is horizontally rotatably mounted on the inner side of the spray bin (3). A wind collecting shell cover (6) is slidably mounted on the lower side of the spray disc (4). A first air injection pipe (5) is fixedly connected to the wind collecting shell cover (6). The first air injection pipe (5) passes through the re-drying bin (2). A high-pressure hot air device is mounted on the end of the first air injection pipe (5) located outside the re-drying bin (2). The wind collecting shell cover 1 (6) is a shape formed by combining two radii of the spray disc (4) forming an acute angle and the circumference thereof; A rotating shaft (10) is vertically fixed at the center of the upper end of the spray disc (4), and a wind transmission mechanism is provided between the rotating shaft (10) and the wind gathering shell cover (6). When the first spray pipe (5) sprays air through the wind gathering shell cover (6), the spray disc (4) is rotated by the wind transmission mechanism and the rotating shaft (10); A plurality of first sieve plates (12) are installed at equal intervals from top to bottom on the inner side of the pre-drying bin (1), and a plurality of second sieve plates (13) are installed at equal intervals from top to bottom on the inner side of the re-drying bin (2); A second air collecting shell (15) is slidably mounted on the upper side of the spray plate (4), and a second air-injection pipe (14) is fixedly connected to the second air-injection shell (15), wherein the second air-injection pipe (14) passes through the pre-drying chamber (1) and is connected to the high-pressure hot air device; The second wind collecting shell cover (15) is also a shape formed by combining the two radii of the spray disc (4) forming an acute angle and the circumference thereof.

2. A cobalt carbonate raw material production drying equipment according to claim 1, characterized in that: The wind power transmission mechanism comprises a transmission assembly and a wheel blade (7); The wheel blade (7) is located on the upper side of the spray disc (4) and is located directly above the wind collecting shell cover (6), and the wheel blade (7) is vertically rotatably mounted on the inner side of the spray bin (3), and the wheel blade (7) is connected to the rotating shaft (10) via the transmission assembly.

3. A cobalt carbonate raw material production drying equipment according to claim 2, characterized in that: The transmission assembly comprises a transmission gear 1 (8) and a transmission gear 2 (9) meshing with each other; The transmission gear 1 (8) is coaxially fixed to the impeller (7), and the transmission gear 2 (9) is coaxially fixed to the rotating shaft (10).

4. A cobalt carbonate raw material production drying equipment according to claim 3, characterized in that: An air gathering ring (16) is installed on the inner side of the spray chamber (3), the air gathering ring (16) is slidably fitted on the upper end surface of the spray disc (4), and the air gathering ring (16) is sleeved on the outer side of the impeller (7); A windshield plate (17) is coaxially arranged on the lower side of the transmission gear 1 (8), the windshield plate (17) is fixed to the side end of the spray bin (3), and the diameter of the windshield plate (17) is greater than the diameter of the transmission gear 1 (8).

5. A cobalt carbonate raw material production drying equipment according to claim 4, characterized in that: Mixing rods (11) are slidably mounted on both upper and lower sides of the first screen plate (12), and a plurality of the mixing rods (11) are mounted on the side ends of the rotating shaft (10).

6. A cobalt carbonate raw material production drying equipment according to claim 1, characterized in that: The sieve holes on two adjacent second sieve plates (13) are arranged in a staggered manner.

7. A cobalt carbonate raw material production drying equipment according to claim 1, characterized in that: The second wind gathering shell cover (15) is arranged adjacent to the first wind gathering shell cover (6), and the second wind gathering shell cover (15) is arranged on a side of the first wind gathering shell cover (6) facing away from the rotation direction of the spray disc (4).

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