A bottom-spraying coating adjustable air distribution plate and fluidized bed

Abstract

The application provides a bottom-spraying coating adjustable air distribution plate and a fluidized bed, and belongs to the technical field of fluidized beds, and comprises an outer ring hole plate, an inner ring fixed plate and an inner ring adjusting plate. A first mounting hole is formed in the middle of the outer ring hole plate; the inner ring fixed plate is mounted in the first mounting hole, a second mounting hole is formed in the middle of the inner ring fixed plate, and a plurality of first strip-shaped holes are formed on the inner ring fixed plate in a radial arrangement; the inner ring adjusting plate is attached and mounted on the lower end face of the inner ring fixed plate, a center avoiding hole is formed in the middle of the inner ring adjusting plate, a plurality of second strip-shaped holes are formed on the inner ring adjusting plate in a radial arrangement, and the inner ring adjusting plate can rotate circumferentially along the center avoiding hole to adjust the flow gap between the second strip-shaped holes and the first strip-shaped holes. The bottom-spraying coating adjustable air distribution plate provided by the application can form different flow gaps for different drugs, and a plurality of hole plates do not need to be prepared for testing, so that the manufacturing cost is reduced, the operation is convenient, and the production efficiency can be greatly improved.

Description

Technical Field

[0001] This invention belongs to the field of fluidized bed technology, and more specifically, relates to a bottom spray coating adjustable air distribution plate and a fluidized bed. Background Technology

[0002] The fluidized bed Uster bottom spray coating structure mainly consists of a spacer ring, a coating pan, an orifice plate, and a spray gun.

[0003] The material is placed in the coating pan, and hot air passes through the perforated plate from the bottom and enters the inside and outside of the separator ring respectively. Due to the difference in the opening ratio and pore size of the perforated plate inside and outside the separator ring, a certain pressure difference is generated inside and outside the separator ring.

[0004] The material between the separator and the coating pan reaches a state of slight boiling. Then, under the pressure difference between the inside and outside of the separator, the material passes through the gap between the perforated plate and the bottom of the separator (the gap is adjustable) and enters the interior of the separator. The material inside the separator rises under the force of hot air, then passes through the top area of ​​the separator and gradually falls outside. The slurry produced by the spray gun nozzle combines with the rising material, coats and dries it, and this process is repeated to achieve the effect of coating the material.

[0005] Orifice plates require careful consideration of parameters such as particle size and density to determine the size, spacing, and arrangement of the inner orifices. Furthermore, for pharmaceutical manufacturers, each drug is confidential, making it impossible to find a suitable orifice plate for reference. This necessitates the fabrication of numerous orifice plates for continuous experimentation until a suitable plate is found. This not only increases manufacturing costs but also makes the process extremely cumbersome, severely impacting production efficiency. Summary of the Invention

[0006] The purpose of this invention is to provide an adjustable air distribution plate for bottom spray coating, which can form different flow gaps for different drugs, eliminating the need to prepare many orifice plates for testing, reducing manufacturing costs, facilitating operation, and significantly improving production efficiency.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is: to provide an adjustable air distribution plate for bottom spray coating, including an outer ring perforated plate, an inner ring fixing plate, and an inner ring adjusting plate;

[0008] The outer ring perforated plate is installed at the bottom of the coating pan, and a first mounting hole is opened in the middle of the outer ring perforated plate. Multiple vent holes are evenly opened on the outer ring perforated plate.

[0009] The inner ring fixing plate is installed in the first mounting hole. The middle part of the inner ring fixing plate is provided with a second mounting hole for installing the spray gun. The inner ring fixing plate is provided with a plurality of first strip holes, which are arranged radially with the second mounting hole as the center.

[0010] The inner ring adjusting plate is fitted onto the lower end face of the inner ring fixing plate. The inner ring adjusting plate has a center hole for avoiding the spray gun in the middle. The inner ring adjusting plate has a plurality of second strip holes, which are arranged radially around the center hole. The inner ring adjusting plate can rotate circumferentially along the center hole to adjust the flow gap between the second strip holes and the first strip holes.

[0011] In one possible implementation, the outer ring of the inner ring fixing plate is provided with an annular airflow adjustment area, the inner diameter of the airflow adjustment area is the same as the outer diameter of the clearance center hole, and a plurality of the first strip holes are radially opened in the airflow adjustment area.

[0012] The inner ring of the inner ring fixing plate is provided with an annular material accumulation area. The outer diameter of the material accumulation area is the same as the outer diameter of the clearance center hole. The second mounting hole is opened in the middle of the material accumulation area. Multiple third strip holes are opened on the material accumulation area. The multiple third strip holes are arranged radially with the second mounting hole as the center.

[0013] In one possible implementation, the first and second strip holes have the same shape and the same number, and the length of the third strip hole is less than the number of the first strip holes.

[0014] In one possible implementation, the first strip hole is a fan-shaped hole, and the width of the first strip hole gradually increases from the center of the inner ring fixing plate to the edge;

[0015] The second strip hole is a fan-shaped hole, and the width of the second strip hole gradually increases from the center of the inner ring adjusting plate to the edge;

[0016] The third strip hole is a fan-shaped hole, and the width of the third strip hole gradually increases from the center of the inner ring adjusting plate to the edge.

[0017] In one possible implementation, the two sides of the first and third strip holes are arranged radially along the inner ring fixing plate, and the two sides of the second strip hole are arranged radially along the inner ring adjusting plate.

[0018] The inner ring fixing plate is used to construct a first annular line arranged concentrically. The first annular line passes through a plurality of first strip holes. The width of the first annular line located in the same first strip hole is a1, and the width of the first annular line located in two adjacent first strip holes is b1, where a1 = b1.

[0019] The inner ring adjustment plate is used to construct a second annular line arranged concentrically. The second annular line passes through multiple second strip holes. The width of the second annular line located in the same second strip hole is a2, and the width of the second annular line located in two adjacent second strip holes is b2, where a2 = b2.

[0020] In one possible implementation, the number of the third strip holes is the same as the number of the first strip holes. The third strip holes are arranged radially between two adjacent first strip holes along the inner ring fixing plate, and the two sides of the third strip holes are respectively located on the same radius line as the opposite sides of the two adjacent first strip holes.

[0021] In one possible implementation, the lower end face of the inner ring fixing plate is coaxially provided with a mounting sleeve, which is inserted into the first mounting hole; the inner ring adjusting plate is provided with a downwardly extending connecting sleeve in the circumferential direction, which is inserted into the mounting sleeve from bottom to top and rotates with the mounting sleeve.

[0022] In one possible implementation, the inner wall of the mounting sleeve is provided with a plurality of radially extending connecting posts, the outer wall of the connecting sleeve is provided with a plurality of circumferentially extending rotating grooves, and the outer wall of the connecting sleeve is also provided with a plurality of longitudinally arranged communicating grooves. The lower ends of the plurality of communicating grooves are connected one-to-one to the same end of the plurality of rotating grooves, and the upper ends of the plurality of communicating grooves extend to the upper end face of the connecting sleeve. The connecting posts move through the corresponding communicating grooves and along the length direction of the rotating grooves, so that the inner ring adjusting plate rotates axially relative to the inner ring fixing plate.

[0023] In one possible implementation, the lower end face of the inner ring fixing plate forms an annular overlapping surface in the area outside the mounting sleeve, and the annular overlapping surface overlaps the inner edge of the upper end face of the outer ring perforated plate and is welded and fixed.

[0024] The beneficial effects of the adjustable air distribution plate for bottom spray coating provided by this invention are as follows: Compared with the prior art, the outer ring perforated plate is installed at the bottom of the coating pan, and the inner ring fixing plate is installed in the middle of the outer ring perforated plate through the first mounting hole. The inner ring fixing plate has a plurality of first strip-shaped holes arranged radially. The inner ring adjusting plate is fitted onto the inner ring fixing plate, and the inner ring adjusting plate has a plurality of second strip-shaped holes arranged radially. The inner ring adjusting plate rotates axially relative to the inner ring fixing plate, thereby continuously changing the flow gap formed by the first strip-shaped holes and the second strip-shaped holes. Different flow gaps can be formed for different drugs. There is no need to prepare many perforated plates for testing, which reduces manufacturing costs, is convenient to operate, and can greatly improve production efficiency.

[0025] The present invention also provides a fluidized bed, including a coating pan, an air inlet sleeve, a spray gun, and a spacer ring. The air inlet sleeve is connected to the lower end of the coating pan. The bottom of the coating pan is provided with the bottom spray coating adjustable air distribution plate. The spacer ring is located in the middle of the inner cavity of the coating pan. A feeding gap is formed between the spacer ring and the inner ring fixing plate. The spray gun passes through the second mounting hole from top to bottom and extends into the interior of the spacer ring.

[0026] The beneficial effects of the fluidized bed provided by this invention are as follows: Compared with the prior art, since the above-mentioned bottom spray coating adjustable air distribution plate is used, the fluidized bed can also form different flow gaps for different drugs, eliminating the need to prepare many orifice plates for testing, reducing manufacturing costs, facilitating operation, and significantly improving production efficiency. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of an adjustable air distribution plate for bottom spray coating provided in an embodiment of the present invention;

[0029] Figure 2 This is a top view of the outer ring perforated plate provided in an embodiment of the present invention;

[0030] Figure 3 This is a top view of the inner ring fixing plate provided in an embodiment of the present invention;

[0031] Figure 4 This is a top view of the inner ring adjusting plate provided in an embodiment of the present invention;

[0032] Figure 5 for Figure 1 A magnified view of a section at point A in the middle;

[0033] Figure 6 This is a cross-sectional view of the inner ring fixing plate provided in an embodiment of the present invention;

[0034] Figure 7 This is a side view of the inner ring adjusting plate provided in an embodiment of the present invention.

[0035] Explanation of reference numerals in the attached figures:

[0036] 100. Coated pan;

[0037] 200. Intake sleeve;

[0038] 300. Spray gun;

[0039] 400, spacer ring;

[0040] 500, Outer ring perforated plate; 510, First mounting hole; 520, Vent hole;

[0041] 600 Inner ring fixing plate; 601 Annular overlapping surface; 610 Second mounting hole; 620 First strip hole; 630 Air volume adjustment area; 640 Material accumulation area; 650 Third strip hole; 660 First annular line; 670 Radius line; 680 Mounting sleeve; 690 Connecting column;

[0042] 700, Inner ring adjusting plate; 710, Clearance center hole; 720, Second strip hole; 730, Second annular line; 740, Connecting sleeve; 750, Rotating groove; 760, Connecting groove. Detailed Implementation

[0043] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0044] Please see Figures 1 to 7 The present invention will now describe an adjustable air distribution plate for bottom spray coating. An adjustable air distribution plate for bottom spray coating includes an outer perforated plate 500, an inner fixed plate 600, and an inner adjusting plate 700.

[0045] An outer ring perforated plate 500 is installed at the bottom of the coating pan 100. A first mounting hole 510 is provided in the middle of the outer ring perforated plate 500, and multiple vent holes 520 are evenly provided on the outer ring perforated plate 500. An inner ring fixing plate 600 is installed in the first mounting hole 510. A second mounting hole 610 for installing a spray gun 300 is provided in the middle of the inner ring fixing plate 600, and multiple first strip-shaped holes 620 are provided on the inner ring fixing plate 600, which are arranged in a radiating pattern around the second mounting hole 610. The inner ring adjusting plate 700 is fitted onto the lower end face of the inner ring fixing plate 600. The inner ring adjusting plate 700 has a center hole 710 for avoiding the spray gun 300 in the middle. The inner ring adjusting plate 700 has a plurality of second strip holes 720. The plurality of second strip holes 720 are arranged radially around the center hole 710. The inner ring adjusting plate 700 can rotate circumferentially along the center hole 710 to adjust the flow gap between the second strip holes 720 and the first strip holes 620.

[0046] This invention provides an adjustable air distribution plate for bottom spray coating. Compared with the prior art, the outer ring perforated plate 500 is installed at the bottom of the coating pan 100, and the inner ring fixing plate 600 is installed in the middle of the outer ring perforated plate 500 through the first mounting hole 510. The inner ring fixing plate 600 has a plurality of first strip-shaped holes 620 arranged radially. The inner ring adjusting plate 700 is fitted onto the inner ring fixing plate 600 and has a plurality of second strip-shaped holes 720 arranged radially. The inner ring adjusting plate 700 rotates axially relative to the inner ring fixing plate 600, thereby continuously changing the flow gap formed by the first strip-shaped holes 620 and the second strip-shaped holes 720. Different flow gaps can be formed for different drugs. There is no need to prepare many perforated plates for testing, which reduces manufacturing costs, is convenient to operate, and can greatly improve production efficiency.

[0047] In some embodiments, please refer to Figure 4 The inner ring fixing plate 600 has an annular airflow adjustment area 630 on its outer ring. The inner diameter of the airflow adjustment area 630 is the same as the outer diameter of the clearance center hole 710. Multiple first strip holes 620 are radially opened in the airflow adjustment area 630. The inner ring fixing plate 600 has an annular material accumulation area 640 on its inner ring. The outer diameter of the material accumulation area 640 is the same as the outer diameter of the clearance center hole 710. A second mounting hole 610 is opened in the middle of the material accumulation area 640. Multiple third strip holes 650 are opened on the material accumulation area 640. The multiple third strip holes 650 are radially arranged with the second mounting hole 610 as the center.

[0048] In this embodiment, both the airflow adjustment zone 630 and the material accumulation zone 640 are annular areas. The airflow adjustment zone 630 is located on the outer ring of the material accumulation zone 640. Multiple first strip-shaped holes 620 are radially arranged within the airflow adjustment zone 630, forming a hot air channel. Since the spray gun 300 is installed from bottom to top through the second mounting hole 610, and the nozzle of the spray gun 300 is located above the second mounting hole 610, the material easily accumulates around the upper structure of the spray gun 300 passing through the second mounting hole 610. Multiple third strip-shaped holes 650 are arranged radially around the second mounting hole 610. Hot air can flow upward through the multiple third strip-shaped holes 650, thereby blowing away the material accumulated around the upper structure of the spray gun 300, preventing the material from not being fully coated due to accumulation.

[0049] In some embodiments, please refer to Figures 2 to 4 The first strip hole 620 and the second strip hole 720 have the same shape and the same number, and the length of the third strip hole 650 is less than the number of the first strip holes 620.

[0050] In this embodiment, the first strip-shaped holes 620 and the second strip-shaped holes 720 have the same shape and the same number. When the inner ring adjusting plate 700 rotates relative to the inner ring fixing plate 600 until all the first strip-shaped holes 620 and the second strip-shaped holes 720 are completely aligned, maximum ventilation can be provided. At the same time, the airflow can be ensured to pass evenly through the inner ring adjusting plate 700 and the inner ring fixing plate 600. As the inner ring adjusting plate 700 gradually rotates relative to the inner ring fixing plate 600, the flow gap formed between the second strip-shaped holes 720 and the first strip-shaped holes 620 gradually decreases, and the airflow of hot air through the inner ring adjusting plate 700 and the inner ring fixing plate 600 gradually decreases to match the needs of different medicines. As the inner ring adjusting plate 700 gradually rotates relative to the inner ring fixing plate 600, the areas where all the first strip-shaped holes 620 and the second strip-shaped holes 720 are staggered and blocked are the same, which can also ensure that the hot air passes evenly through the inner ring adjusting plate 700 and the inner ring fixing plate 600.

[0051] Specifically, the first strip hole 620 is a fan-shaped hole, and the width of the first strip hole 620 gradually increases from the center of the inner ring fixing plate 600 to the edge; the second strip hole 720 is a fan-shaped hole, and the width of the second strip hole 720 gradually increases from the center of the inner ring adjusting plate 700 to the edge; the third strip hole 650 is a fan-shaped hole, and the width of the third strip hole 650 gradually increases from the center of the inner ring adjusting plate 700 to the edge.

[0052] In some embodiments, the inner ring fixing plates 600 on both sides of the first strip hole 620 and the third strip hole 650 are radially arranged, and the inner ring adjusting plates 700 on both sides of the second strip hole 720 are radially arranged.

[0053] In this embodiment, the inner ring fixing plates 600 are radially arranged along both sides of the first strip-shaped hole 620, and the inner ring adjusting plates 700 are radially arranged along both sides of the second strip-shaped hole 720. As the inner ring adjusting plate 700 rotates relative to the inner ring fixing plate 600, the second strip-shaped hole 720 gradually blocks the first strip-shaped hole 620 from one side. When the rotation angle of the inner ring adjusting plate 700 relative to the inner ring fixing plate 600 is the same, the area of ​​the first strip-shaped hole 620 that is blocked is the same. That is to say, as the inner ring adjusting plate 700 rotates relative to the inner ring fixing plate 600, the change in the flow gap formed by the second strip-shaped hole 720 and the first strip-shaped hole 620 is uniform, and there will be no sudden change in ventilation volume. This ensures that the ventilation volume changes evenly throughout the adjustment process, enabling more precise matching for different drugs.

[0054] Please see Figure 3 and Figure 4A first annular line 660 is concentrically arranged using an inner ring fixing plate 600. The first annular line 660 passes through multiple first strip holes 620. The width of the first annular line 660 located in the same first strip hole 620 is a1, and the width of the first annular line 660 located in two adjacent first strip holes 620 is b1, where a1 = b1. A second annular line 730 is concentrically arranged using an inner ring adjusting plate 700. The second annular line 730 passes through multiple second strip holes 720. The width of the second annular line 730 located in the same second strip hole 720 is a2, and the width of the second annular line 730 located in two adjacent second strip holes 720 is b2, where a2 = b2.

[0055] First, an arbitrary first annular line 660 is constructed in the inner ring fixing plate 600. The first annular line 660 passes through multiple first strip holes 620. The width of the first annular line 660 located in the same first strip hole 620 is a1, and the width of the first annular line 660 located in two adjacent first strip holes 620 is b1, where a1 = b1. Obviously, the through-hole area formed by the same first strip hole 620 has the same shape as the blocking area between two adjacent first strip holes 620. Similarly, the through-hole area formed by the same second strip hole 720 has the same shape as the blocking area between two adjacent second strip holes 720.

[0056] Furthermore, since the number, shape, and distribution of the first and second strip-shaped holes 620 and 720 are identical, the through-hole areas formed by the same first strip-shaped hole 620, the through-hole areas formed by the same second strip-shaped hole 720, the blocking areas between adjacent first strip-shaped holes 620, and the blocking areas between adjacent second strip-shaped holes 720 all maintain the same shape. This ensures that as the inner ring adjusting plate 700 rotates relative to the inner ring fixing plate 600, the first and second strip-shaped holes 620 can transition from fully matched opening to gradually and evenly varying blocking, then to complete blocking, and finally gradually and evenly opening again. Throughout the entire rotation process, there are no ineffective rotation areas, improving the efficiency and accuracy of adjustment.

[0057] In some embodiments, please refer to Figure 4 The number of third strip holes 650 is the same as the number of first strip holes 620. The third strip holes 650 are arranged radially between two adjacent first strip holes 620 along the inner ring fixing plate 600, and the two sides of the third strip hole 650 are respectively located on the same radius line 670 with the opposite sides of the two adjacent first strip holes 620.

[0058] In this embodiment, the third strip-shaped hole 650 forms an interleaved air channel with the air channel formed by the first strip-shaped hole 620. When the accumulated material is blown upward using the third strip-shaped hole 650, it can avoid the hot air passing through the first strip-shaped hole 620. Instead, it diffuses outward through the shielding area between two adjacent first strip-shaped holes 620, and further disperses the material tangentially with the help of the hot air passing through the first strip-shaped hole 620, forming an upward and outward diffusion pattern to ensure that the accumulated material is evenly dispersed and to ensure the effect of subsequent coating.

[0059] In some embodiments, please refer to Figures 3 to 7 An mounting sleeve 680 is coaxially provided on the lower end face of the inner ring fixing plate 600, and the mounting sleeve 680 is inserted into the first mounting hole 510; the inner ring adjusting plate 700 is provided with a downwardly extending connecting sleeve 740 in the circumference, and the connecting sleeve 740 is inserted into the mounting sleeve 680 from bottom to top and rotates with the mounting sleeve 680.

[0060] Specifically, the inner wall of the mounting sleeve 680 is provided with a plurality of radially extending connecting posts 690, the outer wall of the connecting sleeve 740 is provided with a plurality of circumferentially extending rotating grooves 750, and the outer wall of the connecting sleeve 740 is also provided with a plurality of longitudinally arranged connecting grooves 760. The lower ends of the plurality of connecting grooves 760 are connected to the same end of the plurality of rotating grooves 750, and the upper ends of the plurality of connecting grooves 760 extend to the upper end face of the connecting sleeve 740. The connecting posts 690 move through the corresponding connecting grooves 760 and along the length direction of the rotating grooves 750, so that the inner ring adjusting plate 700 rotates axially relative to the inner ring fixing plate 600.

[0061] When installing the inner ring adjusting plate 700, place it directly below the inner ring fixing plate 600, aligning the multiple connecting slots 760 of the inner ring adjusting plate 700 with the multiple connecting posts 690 on the inner ring fixing plate 600. Moving the inner ring adjusting plate 700 upwards causes the connecting slots 760 to move upwards, allowing the connecting posts 690 to be fully inserted into the bottom of the connecting slots 760. At this time, the upper end face of the inner ring adjusting plate 700 is against the lower end face of the inner ring fixing plate 600. Axially rotating the inner ring adjusting plate 700 causes the connecting posts 690 to slide within the connecting slots, thereby adjusting the flow gap formed between the first and second strip-shaped holes 620. The inner ring adjusting plate 700 can rotate relative to the inner ring fixing plate 600 without falling off.

[0062] Preferably, the lower end face of the inner ring fixing plate 600 forms an annular overlapping surface 601 in the area outside the mounting sleeve 680. The annular overlapping surface 601 overlaps the inner edge of the upper end face of the outer ring hole plate 500 and is welded and fixed. Welding is performed in the circumferential direction of the annular overlapping surface 601, thereby stably fixing the inner ring fixing plate 600 on the outer ring hole plate 500.

[0063] Based on the same inventive concept, the present invention also provides a fluidized bed, including a coating pan 100, an air inlet sleeve 200, a spray gun 300, and a spacer ring 400. The air inlet sleeve 200 is connected to the lower end of the coating pan 100. The bottom of the coating pan 100 is provided with the aforementioned bottom spray coating adjustable air distribution plate. The spacer ring 400 is located in the middle of the inner cavity of the coating pan 100. A feeding gap is formed between the spacer ring 400 and the inner ring fixing plate 600. The spray gun 300 passes through the second mounting hole 610 from top to bottom and extends into the interior of the spacer ring 400.

[0064] By rotating the inner ring adjusting plate 700, the flow gap formed between the inner ring fixed plate 600 and the inner ring adjusting plate 700 is adjusted, thereby achieving the adjustment of the hot air volume to meet the fluidized bed's requirements for coating different drugs.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A bottom-spray coating adjustable air distribution plate, characterized in that, It includes an outer ring perforated plate (500), an inner ring fixing plate (600), and an inner ring adjusting plate (700); The outer ring perforated plate (500) is installed at the bottom of the coating pan (100), and a first mounting hole (510) is provided in the middle of the outer ring perforated plate (500). A plurality of vent holes (520) are evenly provided on the outer ring perforated plate (500). The inner ring fixing plate (600) is installed in the first mounting hole (510). The middle part of the inner ring fixing plate (600) is provided with a second mounting hole (610) for mounting the spray gun (300). The inner ring fixing plate (600) is provided with a plurality of first strip holes (620). The plurality of first strip holes (620) are arranged radially with the second mounting hole (610) as the center. The inner ring adjusting plate (700) is fitted onto the lower end face of the inner ring fixing plate (600). The inner ring adjusting plate (700) has a center hole (710) for avoiding the spray gun (300) in the middle. The inner ring adjusting plate (700) has a plurality of second strip holes (720) arranged radially around the center hole (710). The inner ring adjusting plate (700) can rotate circumferentially along the center hole (710) to adjust the flow gap between the second strip holes (720) and the first strip holes (620). The outer ring of the inner ring fixing plate (600) is provided with an annular air volume adjustment area (630). The inner diameter of the air volume adjustment area (630) is the same as the outer diameter of the clearance center hole (710). A plurality of first strip holes (620) are radially opened in the air volume adjustment area (630). The inner ring of the inner ring fixing plate (600) is provided with an annular material accumulation area (640). The outer diameter of the material accumulation area (640) is the same as the outer diameter of the clearance center hole (710). The second mounting hole (610) is opened in the middle of the material accumulation area (640). The material accumulation area (640) is provided with a plurality of third strip holes (650). The plurality of third strip holes (650) are arranged radially with the second mounting hole (610) as the center. The first strip hole (620) is a fan-shaped hole, and the width of the first strip hole (620) gradually increases from the center of the inner ring fixing plate (600) to the edge; The second strip hole (720) is a fan-shaped hole, and the width of the second strip hole (720) gradually increases from the center of the inner ring adjusting plate (700) to the edge; The third strip hole (650) is a fan-shaped hole, and the width of the third strip hole (650) gradually increases from the center of the inner ring adjusting plate (700) to the edge; The number of the third strip hole (650) is the same as the number of the first strip hole (620). The third strip hole (650) is arranged radially between two adjacent first strip holes (620) along the inner ring fixing plate (600), and the two sides of the third strip hole (650) are respectively located on the same radius line (670) with the opposite sides of the two adjacent first strip holes (620).

2. The adjustable air distribution plate for bottom spray coating as described in claim 1, characterized in that, The first strip hole (620) and the second strip hole (720) have the same shape and the same number, and the length of the third strip hole (650) is less than the number of the first strip holes (620).

3. The adjustable air distribution plate for bottom spray coating as described in claim 1, characterized in that, The two sides of the first strip hole (620) and the third strip hole (650) are arranged radially along the inner ring fixing plate (600), and the two sides of the second strip hole (720) are arranged radially along the inner ring adjusting plate (700). The inner ring fixing plate (600) is used to construct a first annular line (660) arranged concentrically. The first annular line (660) passes through a plurality of first strip holes (620). The width of the first annular line (660) located in the same first strip hole (620) is a1, and the width of the first annular line (660) located in two adjacent first strip holes (620) is b1, where a1=b1; The inner ring adjusting plate (700) is used to construct a second annular line (730) arranged concentrically. The second annular line (730) passes through a plurality of second strip holes (720). The width of the second annular line (730) located in the same second strip hole (720) is a2, and the width of the second annular line (730) located in two adjacent second strip holes (720) is b2, where a2=b2.

4. The adjustable air distribution plate for bottom spray coating as described in any one of claims 1-3, characterized in that, The lower end face of the inner ring fixing plate (600) is coaxially provided with a mounting sleeve (680), which is inserted into the first mounting hole (510); the inner ring adjusting plate (700) is provided with a downwardly extending connecting sleeve (740) in the circumferential direction, which is inserted into the mounting sleeve (680) from bottom to top and rotates with the mounting sleeve (680).

5. The adjustable fabric air plate for bottom spray coating as described in claim 4, characterized in that, The inner wall of the mounting sleeve (680) is provided with a plurality of radially extending connecting posts (690), the outer wall of the connecting sleeve (740) is provided with a plurality of circumferentially extending rotating grooves (750), and the outer wall of the connecting sleeve (740) is also provided with a plurality of longitudinally arranged communicating grooves (760). The lower ends of the plurality of communicating grooves (760) are connected one-to-one to the same end of the plurality of rotating grooves (750), and the upper ends of the plurality of communicating grooves (760) extend to the upper end face of the connecting sleeve (740). The connecting posts (690) move through the corresponding communicating grooves (760) and along the length direction of the rotating grooves (750) so that the inner ring adjusting plate (700) rotates axially relative to the inner ring fixing plate (600).

6. The adjustable fabric air plate for bottom spray coating as described in claim 4, characterized in that, The lower end face of the inner ring fixing plate (600) forms an annular overlapping surface (601) in the area outside the mounting sleeve (680). The annular overlapping surface (601) overlaps the inner edge of the upper end face of the outer ring perforated plate (500) and is welded and fixed.

7. A fluidized bed, characterized in that, The coating includes a coating pan (100), an air inlet sleeve (200), a spray gun (300), and a spacer ring (400). The air inlet sleeve (200) is connected to the lower end of the coating pan (100). The bottom of the coating pan (100) is provided with an adjustable air distribution plate for bottom spray coating as described in any one of claims 1-6. The spacer ring (400) is located in the middle of the inner cavity of the coating pan (100). A feeding gap is formed between the spacer ring (400) and the inner ring fixing plate (600). The spray gun (300) passes through the second mounting hole (610) from top to bottom and extends into the interior of the spacer ring (400).

Images