Flash drying device for polyvinylidene fluoride material production

Abstract

The invention belongs to the technical field of flash drying, and particularly relates to a polyvinylidene fluoride material production flash drying device which comprises a drying tank, an air inlet pipe, a discharging pipe and a feeding pipe are fixedly installed on the drying tank in a penetrating mode, and an air distribution plate is fixedly installed in the drying tank and located above the air inlet pipe. A draught fan fixedly installed on the inner wall of the bottom of the drying tank is arranged below the gas distribution plate, a first inverted conical barrel, a filter barrel and a positive conical barrel are rotationally installed in the drying tank, and the discharging pipe, the first inverted conical barrel and the feeding pipe are sequentially arranged from top to bottom. Through cooperation of a second inverted conical cylinder, a third inverted conical cylinder and a plurality of first arc-shaped plates, the situation that materials are stacked can be avoided, materials falling on the second inverted conical cylinder through a feeding pipe are continuously thrown to the inner wall of the drying tank by centrifugal force generated by the first arc-shaped plates, large-particle materials can be crushed through impact, and the crushing efficiency is improved. And subsequent grinding is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of flash drying, in particular to a flash drying device for producing polyvinylidene fluoride materials. Background Art

[0002] In recent years, polyvinylidene fluoride has been increasingly widely used in lithium battery materials, engineering plastics, coatings, insulating materials, ion exchange membrane materials, filter elements and other fields. When preparing polyvinylidene fluoride powder, the polyvinylidene fluoride particles are usually ground and crushed. Since the polyvinylidene fluoride particles absorb a part of moisture during storage, they need to be dried while being ground and crushed. In the prior art, a flash drying device refers to a mechanical device that uses thermal energy to reduce the moisture content of a material. It is used for drying the material and also has the function of crushing the material. Flash drying vaporizes and releases moisture (generally water or other volatile liquid components) in the material by heating. The purpose of drying is for the use of the material or further processing. Therefore, it is very suitable for crushing and drying polyvinylidene fluoride particles.

[0003] However, some existing flash drying equipment may cause material accumulation during operation. In this case, the material cannot be fully contacted with the hot air, resulting in poor drying effect. Therefore, a flash drying device for producing polyvinylidene fluoride material is proposed. Summary of the invention

[0004] In order to solve the shortcomings in the prior art, the present invention proposes a flash drying device for producing polyvinylidene fluoride materials.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a flash drying device for producing polyvinylidene fluoride materials, which is used to crush and dry granular polyvinylidene fluoride into powdery polyvinylidene fluoride, including a drying tank, on which an air inlet pipe, a discharge pipe and a feed pipe are fixedly installed in a through-type manner, an air distribution plate is fixedly installed in the drying tank, the air distribution plate is located above the air inlet pipe, and a fan fixedly installed on the inner wall of the bottom of the drying tank is arranged below the air distribution plate, an inverted cone cylinder 1, a filter cylinder and a normal cone cylinder are rotatably installed in the drying tank, the discharge pipe, the inverted cone cylinder 1 and the feed pipe are arranged in sequence from top to bottom, and the two ends of the filter cylinder are fixedly connected to the inverted cone cylinder 1 and the normal cone cylinder respectively, a motor for driving the inverted cone cylinder 1 to rotate is provided on the top of the drying tank, and a crushing mechanism is sleeved on the outer side of the filter cylinder, and the crushing mechanism is used to impact and crush the material, and screen and grind the mixture of granular material and powdery material formed after the impact and crushing.

[0006] Preferably, the crushing mechanism includes an inverted cone cylinder 2 fixedly mounted on the inner wall of the drying tank, and the inverted cone cylinder 2 is located below the feed pipe. The crushing mechanism also includes an inverted cone cylinder 3 fixedly sleeved on the outside of the filter cylinder, and a plurality of arc plates 1 distributed in a circular array are fixedly mounted on the top of the inverted cone cylinder 3, and the top of the arc plate 1 is slidably connected to the bottom of the inverted cone cylinder 2.

[0007] Preferably, the crushing mechanism also includes an annular filter plate fixedly mounted on the inner wall of the drying tank, and a plurality of arc plates 2 distributed in a circular array are fixedly mounted on the bottom of the inverted cone cylinder 3, the bottoms of the plurality of arc plates 2 are all slidably connected to the top of the annular filter plate, and the side of the arc plate 2 away from the center of the annular filter plate is slidably connected to the inner wall of the drying tank.

[0008] Preferably, a scraper slidably connected to the inner wall of the drying tank is fixedly mounted on the top of each of the plurality of arc-shaped plates; one side of the scraper is fixedly connected to the three side surfaces of the inverted cone; and the top of the scraper is slidably connected to the bottom of the second inverted cone.

[0009] Preferably, the rotation directions of the arc plate 2 and the scraper plate are the same, and the rotation directions of the arc plate 2 and the arc plate 1 are opposite.

[0010] Preferably, a cylinder is fixedly mounted on the inner side of the annular filter plate, the cylinder is sleeved on the outer side of the filter cylinder, and a heating channel is formed between the filter cylinder and the cylinder.

[0011] Preferably, a grinding surface 1 is provided on the top of the annular filter plate, a grinding surface 2 is provided on the bottom of the inverted cone cylinder 3, and an inverted cone-shaped grinding channel is formed between the grinding surface 1 and the grinding surface 2.

[0012] Preferably, the forward cone is provided with a plurality of through openings distributed in a circular array, and the discharge pipe is connected to a multi-stage cyclone separator.

[0013] Preferably, the motor is fixedly mounted on the top of the drying tank, the output shaft of the motor rotates and extends into the drying tank and is fixedly mounted with a connecting frame, and the bottom end of the connecting frame is fixedly connected to an inner side of the inverted cone.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The present invention can avoid the accumulation of materials through the cooperation of the inverted cone cylinder 2, the inverted cone cylinder 3 and the plurality of arc-shaped plates 1. The materials falling on the inverted cone cylinder 2 through the feed pipe will be continuously thrown onto the inner wall of the drying tank by the centrifugal force generated by the plurality of arc-shaped plates 1, and the large particles of materials can be broken by the impact, so that they are convenient for subsequent grinding. The materials falling on the annular filter plate will be continuously gathered towards the center of the annular filter plate due to the scraping of multiple arc plates 2 rotating with the inverted cone cylinder 3. During this movement, the conical grinding channel formed between the grinding surface 1 and the grinding surface 2 will grind and crush the materials. In the process of arc plate 2 scraping over the top of the annular filter plate, not only can the materials be gathered toward the center of the annular filter plate, but also in the process of scraping over the materials, some powder materials that have reached the target size due to being broken or ground in a short time will directly fall through the holes on the annular filter plate. Therefore, the situation in which the powder materials are blocked in the conical grinding channel formed between grinding surface 1 and grinding surface 2 and affect the grinding of granular materials occurs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the overall structure of a flash drying device for producing polyvinylidene fluoride materials proposed by the present invention; Figure 2 It is a partial side cross-sectional view of a flash drying device for producing polyvinylidene fluoride materials proposed by the present invention; Figure 3 for Figure 2 A schematic diagram of the enlarged structure of part A; Figure 4 A partial side section of a drying tank and a crushing mechanism in a flash drying device for producing polyvinylidene fluoride materials proposed by the present invention; Figure 5 A partial side section 2 of a drying tank and a crushing mechanism in a flash drying device for producing polyvinylidene fluoride materials proposed by the present invention; Figure 6 The invention proposes a method for preventing the explosion of a crushing mechanism in a flash drying device for producing polyvinylidene fluoride materials. Figure 1 ; Figure 7 The invention proposes a method for preventing the explosion of a crushing mechanism in a flash drying device for producing polyvinylidene fluoride materials. Figure 2 ; Figure 8 The present invention provides a schematic structural diagram of an annular filter plate and an inverted cone cylinder three in a flash drying device for producing polyvinylidene fluoride materials.

[0016] In the figure: 1. drying tank; 11. air inlet pipe; 12. discharge pipe; 13. feed pipe; 2. air distribution plate; 3. fan; 4. motor; 41. connecting frame; 5. inverted cone cylinder 1; 6. filter cylinder; 7. normal cone cylinder; 71. through port; 8. crushing mechanism; 81. inverted cone cylinder 2; 82. annular filter plate; 821. grinding surface 1; 83. inverted cone cylinder 3; 831. grinding surface 2; 84. arc plate 1; 85. arc plate 2; 86. scraper; 87. cylinder; 9. heating channel; 10. multi-stage cyclone separator. DETAILED DESCRIPTION

[0017] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] Please refer to Figure 1-Figure 8 The present invention provides a technical solution: a flash drying device for producing polyvinylidene fluoride materials, comprising a drying tank 1, an air inlet pipe 11, a discharge pipe 12 and a feed pipe 13 are fixedly installed on the drying tank 1, an air distribution plate 2 is fixedly installed in the drying tank 1, the air distribution plate 2 is located above the air inlet pipe 11, and a fan 3 fixedly installed on the inner wall of the bottom of the drying tank 1 is arranged below the air distribution plate 2, an inverted cone cylinder 5, a filter cylinder 6 and a positive cone cylinder 7 are rotatably installed in the drying tank 1, the discharge pipe 12, the inverted cone cylinder 5 and the feed pipe 13 are arranged in sequence from top to bottom, and the two ends of the filter cylinder 6 are fixedly connected to the inverted cone cylinder 5 and the positive cone cylinder 7 respectively, a motor 4 for driving the inverted cone cylinder 5 to rotate is arranged on the top of the drying tank 1, and a crushing mechanism 8 is sleeved on the outer side of the filter cylinder 6, and the crushing mechanism 8 is used to impact and crush the material, and screen and grind the granular material and powdery material mixture formed after the impact and crushing.

[0019] The crushing mechanism 8 includes an inverted cone cylinder 81 fixedly mounted on the inner wall of the drying tank 1, and the inverted cone cylinder 81 is located below the feed pipe 13. The crushing mechanism 8 also includes an inverted cone cylinder 83 fixedly sleeved on the outside of the filter cylinder 6, and a plurality of arc plates 84 distributed in a circular array are fixedly mounted on the top of the inverted cone cylinder 83, and the top of the arc plate 84 is slidably connected to the bottom of the inverted cone cylinder 81.

[0020] The crushing mechanism 8 also includes an annular filter plate 82 fixedly mounted on the inner wall of the drying tank 1, and a plurality of arc plates 85 distributed in a circular array are fixedly mounted on the bottom of the inverted cone 83, the bottoms of the plurality of arc plates 85 are all slidably connected to the top of the annular filter plate 82, and the side of the arc plate 85 away from the center of the annular filter plate 82 is slidably connected to the inner wall of the drying tank 1.

[0021] A scraper 86 slidably connected to the inner wall of the drying tank 1 is fixedly installed on the top of the plurality of arc plates 2 85 , one side of the scraper 86 is fixedly connected to the side of the inverted cone cylinder 3 83 , and the top of the scraper 86 is slidably connected to the bottom of the inverted cone cylinder 2 81 .

[0022] Furthermore, since the filter cylinder 6 is provided with evenly distributed holes, when the rising high-temperature drying cyclone wind field passes through the filter cylinder 6, the heat will be conducted through the filter cylinder 6 to the inverted cone cylinder 2 81, the annular filter plate 82 and the inverted cone cylinder 3 83. Therefore, the material can be heated when it is between the inverted cone cylinder 2 81 and the inverted cone cylinder 3 83 or between the inverted cone cylinder 3 83 and the annular filter plate 82, and the moisture generated by drying will be discharged through the holes on the filter cylinder 6 following the rising cyclone wind field.

[0023] The rotation directions of the arc plate 2 85 and the scraper 86 are the same, and the rotation directions of the arc plate 2 85 and the arc plate 1 84 are opposite.

[0024] Further, such as Figure 2 , Figure 4-Figure 7 As shown, during the clockwise rotation of the inverted cone cylinder 3 83 following the filter cylinder 6, the multiple arc plates 1 84 will provide centrifugal force to the materials gathered at the center of the inverted cone cylinder 3 83, making it move away from the center of the inverted cone cylinder 3 83, while the multiple arc plates 2 85 will continuously gather the materials falling on the top of the annular filter plate 82 at the center of the annular filter plate 82.

[0025] A cylinder 87 is fixedly installed on the inner side of the annular filter plate 82 . The cylinder 87 is sleeved on the outer side of the filter cylinder 6 . A heating channel 9 is formed between the filter cylinder 6 and the cylinder 87 .

[0026] Furthermore, the powdered material after being ground in the conical grinding channel between grinding surface 1 821 and grinding surface 2 831 will be spread out in the process of passing through the heating channel 9. Due to the cyclone wind field formed by the rising high-temperature dry air in the filter cartridge 6, the heat will be transferred to the powdered material flowing through the heating channel 9 through the filter cartridge 6, so that it will be initially heated, and the generated moisture will enter the inner side of the filter cartridge 6 through the holes on the filter cartridge 6 and be carried away by the rising airflow.

[0027] A grinding surface 1 821 is provided on the top of the annular filter plate 82 , a grinding surface 2 831 is provided on the bottom of the inverted cone cylinder 83 , and an inverted cone-shaped grinding channel is formed between the grinding surface 1 821 and the grinding surface 2 831 .

[0028] The positive cone 7 is provided with a plurality of through openings 71 distributed in a circular array, and the discharge pipe 12 is connected to a multi-stage cyclone separator 10 .

[0029] The motor 4 is fixedly installed on the top of the drying tank 1, and the output shaft of the motor 4 rotates and extends into the drying tank 1 and is fixedly installed with a connecting frame 41, and the bottom end of the connecting frame 41 is fixedly connected to the inner side of the inverted cone cylinder 5.

[0030] Furthermore, the starting motor 4 can drive the inverted cone cylinder 1 5 , the filter cylinder 6 and the positive cone cylinder 7 to rotate through the connecting frame 41 , and the inverted cone cylinder 3 83 will rotate synchronously with the filter cylinder 6 .

[0031] In this embodiment: a screw conveyor is used to convey the material into the drying tank 1 through the feed pipe 13, and the motor 4 is started to drive the inverted cone cylinder 1 5, the filter cylinder 6 and the positive cone cylinder 7 to rotate. After the material is discharged from the feed pipe 13, it will fall on the inverted cone cylinder 2 81. At the same time, high-temperature dry air is injected into the air inlet pipe 11, and the fan 3 is started. After that, under the action of gravity, the material will continue to gather at the center of the inverted cone cylinder 2 81, and the material falling from the center of the inverted cone cylinder 2 81 will fall on the inverted cone cylinder 3 83; The inverted cone barrel 3 83 which rotates synchronously with the filter barrel 6 will throw out the materials gathered at the center of the inverted cone barrel 3 83 through the multiple arc plates 1 84. Under the action of centrifugal force, the multiple arc plates 1 84 throw the materials onto the inner wall of the drying tank 1. After the materials hit the drying tank 1, they will be cracked. After the cracks, the materials fall downward and fall on the annular filter plate 82. At the same time, some powdered materials will stick to the inner wall of the drying tank 1. During the rotation of the inverted cone barrel 3 83, the multiple scrapers 86 will be driven to rotate synchronously and scrape the inner wall of the drying tank 1. The powdered materials attached to the inner wall of the drying tank 1 due to the impact can be scraped off and fall on the annular filter plate 82. The materials falling on the annular filter plate 82 will be continuously gathered towards the center of the annular filter plate 82 due to the sweeping of the multiple arc plates 2 85 rotating with the inverted cone cylinder 3 83. During this movement, the conical grinding channel formed between the grinding surface 1 821 and the grinding surface 2 831 will grind and crush the materials, and the powder materials crushed into the target diameter will fall into the cylinder 87. In the process of the arc plate 2 85 scraping the top of the annular filter plate 82, some powder materials that are broken or reach the target size after a short time of grinding will directly fall through the holes on the annular filter plate 82, thereby reducing the blockage of the powder materials in the conical grinding channel formed between the grinding surface 1 821 and the grinding surface 2 831, so that the grinding of the granular materials will not be affected; The material falling into the cylinder 87 will be heated by the heat conducted by the heating channel 9 during the process of falling through the heating channel 9. Finally, the completely powdered material will pass through multiple through ports 71 and fall on the air distribution plate 2. The working fan 3 will make the high-temperature dry air discharged from the air inlet pipe 11 form a rotating wind field on the top of the air distribution plate 2. The powdered material falling on the top of the air distribution plate 2 will continuously gather toward the center of the circle of the air distribution plate 2 and move upward. Finally, the powdered material will pass through the filter cartridge 6 and enter the multi-stage cyclone separator 10 through the discharge pipe 12. In the process of the powdered material passing through the filter cartridge 6, the high-temperature dry air will heat and dry it. In this process, if the powdered material is not completely dried, the rising cyclone wind field will not be able to bring it to the specified height, so that it will always be suspended in the filter cartridge 6 for drying. Only when the powdered material is completely dried and its mass becomes lighter will it be transported to the discharge pipe 12 along with the cyclone wind field. After entering the multi-stage cyclone separator 10, the powder will be cooled by cyclones for many times, so that the material can be flash dried and crushed and then cooled quickly.

[0032] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A flash drying device for producing polyvinylidene fluoride materials, comprising a drying tank (1), characterized in that: An air inlet pipe (11), a discharge pipe (12) and a feed pipe (13) are fixedly installed through the drying tank (1); an air distribution plate (2) is fixedly installed inside the drying tank (1); the air distribution plate (2) is located above the air inlet pipe (11); a fan (3) is fixedly installed on the inner wall of the bottom of the drying tank (1) below the air distribution plate (2); an inverted cone cylinder (5), a filter cylinder (6) and a forward cone cylinder (7) are rotatably installed inside the drying tank (1); the discharge pipe (12), The inverted cone cylinder (5) and the feed pipe (13) are arranged in sequence from top to bottom. The two ends of the filter cylinder (6) are fixedly connected to the inverted cone cylinder (5) and the positive cone cylinder (7) respectively. The top of the drying tank (1) is provided with a motor (4) for driving the inverted cone cylinder (5) to rotate. The outer side of the filter cylinder (6) is provided with a crushing mechanism (8). The crushing mechanism (8) is used to impact crush the material, and to screen and grind the granular material and powdery material mixture formed after the impact crushing.

2. A flash drying device for producing polyvinylidene fluoride materials according to claim 1, characterized in that: The crushing mechanism (8) comprises an inverted cone cylinder 2 (81) fixedly mounted on the inner wall of the drying tank (1), the inverted cone cylinder 2 (81) being located below the feed pipe (13), the crushing mechanism (8) further comprises an inverted cone cylinder 3 (83) fixedly sleeved on the outside of the filter cylinder (6), a plurality of arc-shaped plates 1 (84) distributed in a circular array being fixedly mounted on the top of the inverted cone cylinder 3 (83), the top of the arc-shaped plates 1 (84) being slidably connected to the bottom of the inverted cone cylinder 2 (81).

3. A flash drying device for producing polyvinylidene fluoride materials according to claim 2, characterized in that: The crushing mechanism (8) further comprises an annular filter plate (82) fixedly mounted on the inner wall of the drying tank (1); a plurality of arc-shaped plates (85) distributed in a circumferential array are fixedly mounted on the bottom of the inverted cone cylinder (83); the bottoms of the plurality of arc-shaped plates (85) are all slidably connected to the top of the annular filter plate (82); and a side of the arc-shaped plate (85) away from the center of the annular filter plate (82) is slidably connected to the inner wall of the drying tank (1).

4. A flash drying device for producing polyvinylidene fluoride materials according to claim 3, characterized in that: A scraper (86) slidably connected to the inner wall of the drying tank (1) is fixedly mounted on the top of each of the plurality of arc-shaped plates (85); one side of the scraper (86) is fixedly connected to the side surface of the inverted cone cylinder (83); and the top of the scraper (86) is slidably connected to the bottom of the inverted cone cylinder (81).

5. A flash drying device for producing polyvinylidene fluoride materials according to claim 4, characterized in that: The arc plate 2 (85) and the scraper plate (86) have the same rotation direction, and the arc plate 2 (85) and the arc plate 1 (84) have opposite rotation directions.

6. A flash drying device for producing polyvinylidene fluoride materials according to claim 3, characterized in that: A cylinder (87) is fixedly mounted on the inner side of the annular filter plate (82); the cylinder (87) is sleeved on the outer side of the filter cylinder (6); a heating channel (9) is formed between the filter cylinder (6) and the cylinder (87).

7. The flash drying device for producing polyvinylidene fluoride materials according to claim 3, characterized in that: A first grinding surface (821) is provided at the top of the annular filter plate (82), a second grinding surface (831) is provided at the bottom of the third inverted cone cylinder (83), and an inverted cone-shaped grinding channel is formed between the first grinding surface (821) and the second grinding surface (831).

8. The flash drying device for producing polyvinylidene fluoride materials according to claim 1, characterized in that: The positive cone cylinder (7) is provided with a plurality of through openings (71) distributed in a circular array, and the discharge pipe (12) is connected to a multi-stage cyclone separator (10).

9. The flash drying device for producing polyvinylidene fluoride materials according to claim 1, characterized in that: The motor (4) is fixedly mounted on the top of the drying tank (1); the output shaft of the motor (4) rotates and extends into the drying tank (1) and is fixedly mounted with a connecting frame (41); the bottom end of the connecting frame (41) is fixedly connected to the inner side of the inverted cone cylinder (5).

Images