Impurity removing device for food-grade potassium phosphate production

Abstract

The invention is applicable to the field of production of potassium phosphate, and provides an impurity removing device for production of food-grade potassium phosphate, which comprises a base and further comprises a centrifugal chamber, the centrifugal chamber is positioned on one side of the base and comprises a barrel fixedly arranged on the base and a drum component positioned in the barrel, a sealing cover component is arranged at the top of the barrel, and the drum component is positioned in the barrel. A main shaft is rotationally arranged in the center of the bottom in the barrel, and the top of the main shaft is fixedly connected with a connecting disc connected with the bottom of the drum assembly; the driving assembly is located on the base and used for driving the main shaft in the barrel and the rotary drum assembly to rotate; and the self-adaptive locking disc is fixedly arranged on the main shaft and located at the bottom of the rotary drum assembly, and the bottom of the rotary drum assembly is fixedly connected with a limiting clamping ring. The device has the beneficial effects that on the basis that the stable rotation of the rotary drum assembly is realized, the installation of the rotary drum assembly is more flexible.

Description

Technical Field

[0001] The present invention belongs to the field of potassium phosphate production, and particularly relates to an impurity removal device for producing food-grade potassium phosphate salts. Background Art

[0002] Potassium phosphate salts are a class of compounds containing two essential macronutrients for plants, phosphorus (P) and potassium (K), and they have a wide range of applications in agriculture, horticulture, and industry. For example, common fertilizers are of course also used as food additives in the food industry.

[0003] In the production process of potassium phosphate salts, removing impurities is a very important step. This is not only to improve the purity of the product but also to meet the requirements of different application fields for product quality. During the synthesis of potassium phosphate salts, a suspension containing solid particles is generated. At this time, a centrifuge can play a role, enabling solid-liquid separation to achieve the purpose of removing impurities and making the obtained potassium phosphate crystal purer.

[0004] In the prior art, centrifuges all use a rotating drum rotating at high speed to achieve solid-liquid separation. Impurities will be blocked and gathered on the side wall of the rotating drum to form a filter cake. Due to high-speed rotation, the filter cake has a relatively high density and tightly adheres to the side wall of the rotating drum. To remove these filter cakes, the centrifuge needs to be opened and then cleaned by scraping, which is inconvenient. Therefore, an impurity removal device for producing food-grade potassium phosphate salts is proposed to solve the above problems. Summary of the Invention

[0005] The purpose of the embodiments of the present invention is to provide an impurity removal device for producing food-grade potassium phosphate salts, aiming to solve the problems mentioned in the above background art.

[0006] The embodiments of the present invention are implemented as follows. An impurity removal device for producing food-grade potassium phosphate salts includes a base, and further includes:

[0007] A centrifugation chamber located on one side of the base. The centrifugation chamber includes a cylinder fixedly arranged on the base and a drum assembly located inside the cylinder. A cover assembly is arranged at the top of the cylinder, and a main shaft is rotatably arranged at the center of the bottom inside the cylinder. The top of the main shaft is fixedly connected to a connection disk for connecting to the bottom of the drum assembly. When the connection disk is connected to the drum assembly, the movement of the drum assembly in the vertical direction is not restricted;

[0008] A driving assembly located on the base and used to drive the main shaft and the drum assembly inside the cylinder to rotate;

[0009] The adaptive locking disc is fixedly arranged on the main shaft and is located at the bottom of the drum assembly. A limit snap ring is fixedly connected to the bottom of the drum assembly. When the main shaft and the drum assembly rotate, the adaptive locking disc is used to cooperate with the limit snap ring to fix the drum assembly.

[0010] Preferably, a feeding pipe for conveying materials is fixedly connected to the cover assembly, and one end of the feeding pipe located inside the cylinder body is also inside the drum assembly. The top of the drum assembly is of an open structure. A sunken collection tank is arranged at the edge of the bottom of the cylinder body. A discharge port is opened in the collection tank, and the discharge port is communicated with a discharge pipe fixedly connected to the base.

[0011] Preferably, the drum assembly is a cylindrical structure with distributed filter holes on the side facing the side wall of the cylinder body. A plurality of positioning holes are evenly distributed on the connecting disc. A plurality of positioning columns corresponding to the positioning holes are fixedly connected to the bottom of the drum assembly. When the connecting disc is connected to the drum assembly, the positioning columns are located in the positioning holes. The limit snap ring is located outside the connecting disc, and the contour diameters of the limit snap ring and the adaptive locking disc located on the main shaft are both smaller than the contour diameter of the drum assembly.

[0012] An adjustable air-blowing assembly is arranged on the cover assembly, and the adjustable air-blowing assembly is used to blow air into the drum assembly through the distributed filter holes.

[0013] Preferably, the adaptive locking disc includes a disc body fixedly sleeved on the main shaft. A plurality of sliding grooves are evenly arranged on the disc body along the radial direction of the disc body. A moving block is slidably connected in the sliding groove. A claw for cooperating with the limit snap ring is fixedly connected to the moving block. An elastic reset member connected to the moving block is also arranged in the sliding groove. A sealing ring is fixedly connected to the edge of the disc body, and the sealing ring is located outside the limit snap ring.

[0014] Preferably, a circular hole is opened on the cover assembly. The adjustable air-blowing assembly includes a straight-through pipe located in the circular hole and in a vertical state. One end of the straight-through pipe located inside the cylinder body is fixedly connected with an arc-shaped closed cover facing the side of the drum assembly. The arc-shaped closed cover is located between the drum assembly and the side wall of the cylinder body. A trachea connected to an external air supply system is arranged at the top of the straight-through pipe. A horizontal cross frame is fixedly connected to the top of the straight-through pipe. Telescopic members facing the cover assembly and in a vertical state are fixedly connected to both ends of the cross frame. The bottom of the telescopic member is fixedly connected with a driving slide seat. The driving slide seat is in cooperation connection with a guide rail fixedly connected to the cover assembly. The guide rails on both sides are distributed along the radial direction of the cover assembly. The telescopic member is used to drive the arc-shaped closed cover to move vertically in the cylinder body, and the driving slide seat is used to drive the arc-shaped closed cover to move horizontally in the cylinder body.

[0015] Preferably, a mounting ring is slidably sleeved on the straight-through pipe, and a sealing rubber film connected to the circular hole is fixedly connected to the mounting ring.

[0016] Preferably, the driving assembly includes a driving member fixedly connected to the base and located on one side of the cylinder, the driving member is connected to the main shaft through a transmission member located at the bottom of the base, and the rotation speed of the main shaft is greater than the output rotation speed of the driving member.

[0017] An impurity removal device for food-grade potassium phosphate production provided by an embodiment of the present invention has the following beneficial effects: the main structure of the device is similar to that of a conventional centrifuge, and is characterized in that, for the improvement of the interior of the centrifugal chamber, the conventional connection method between the drum assembly and the main shaft is changed, and the drum assembly can be driven to rotate by the main shaft driving connecting disk. During the rotation process, the adaptive locking disk can automatically cooperate with the limiting clamp ring at the bottom of the drum assembly to lock the drum assembly, which serves to improve the instability of the drum assembly in a non-fixed connection state. When the main shaft stops rotating, the main shaft is connected to the drum assembly only by the connecting disk, so that the drum assembly can be conveniently taken out as a whole. At this time, it will be obviously more convenient to clean the filter cake in the drum assembly. Therefore, on the basis of realizing the stable rotation of the drum assembly, the device makes the installation of the drum assembly more flexible and the daily cleaning work easier to carry out. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A three-dimensional structural diagram of an impurity removal device for producing food-grade potassium phosphate provided by an embodiment of the present invention;

[0019] Figure 2 A front view of an impurity removal device for producing food-grade potassium phosphate provided by an embodiment of the present invention;

[0020] Figure 3 A three-dimensional structural diagram of a centrifugal chamber provided in an embodiment of the present invention;

[0021] Figure 4 An internal structural diagram of a centrifugal chamber provided by an embodiment of the present invention;

[0022] Figure 5 A three-dimensional structural diagram of a drum assembly provided in an embodiment of the present invention;

[0023] Figure 6 A three-dimensional structural diagram of an adaptive locking disk provided in an embodiment of the present invention;

[0024] Figure 7 A diagram showing the positional relationship between the rotating drum assembly and the adjustable blowing assembly provided in an embodiment of the present invention.

[0025] In the attached drawings: 1. Base; 2. Cylinder body; 3. Drum assembly; 301. Positioning column; 4. Cover assembly; 401. Circular hole position; 5. Main shaft; 6. Connecting plate; 601. Positioning hole; 7. Adaptive locking disc; 701. Disc body; 702. Chute; 703. Moving block; 704. Claw; 705. Elastic reset member; 706. Sealing ring; 8. Limit snap ring; 9. Feeding pipe; 10. Collection tank; 11. Discharge port; 12. Discharge pipe; 13. Adjustable blowing assembly; 1301. Straight pipe; 1302. Arc-shaped closed cover; 1303. Air pipe; 1304. Cross frame; 1305. Telescopic member; 1306. Driving slide; 1307. Guide rail; 14. Mounting ring; 15. Sealing film; 16. Driving member; 17. Transmission member; 18. Protective cover. Detailed implementation manners

[0026] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the attached drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0027] The following describes in detail the specific implementation of the present invention with reference to specific embodiments.

[0028] As Figure 1 and Figure 3 shown, an impurity removal device for food-grade potassium phosphate production provided by an embodiment of the present invention includes a base 1, and further includes:

[0029] A centrifugal chamber, the centrifugal chamber is located on one side of the base 1. The centrifugal chamber includes a cylinder body 2 fixedly arranged on the base 1 and a drum assembly 3 located inside the cylinder body 2. A cover assembly 4 is arranged at the top of the cylinder body 2. The cover assembly 4 can be opened and is fixed to the top of the cylinder body 2 by means of a lock. A main shaft 5 is rotatably arranged at the center position of the inner bottom of the cylinder body 2. The top of the main shaft 5 is fixedly connected with a connecting plate 6 for connecting with the bottom of the drum assembly 3. When the connecting plate 6 is connected to the drum assembly 3, the movement of the drum assembly 3 in the vertical direction is not restricted, that is, the movement of the drum assembly 3 towards the top of the cylinder body 2 is not locked.

[0030] A driving assembly, the driving assembly is located on the base 1 and is used to drive the main shaft 5 and the drum assembly 3 inside the cylinder body 2 to rotate.

[0031] An adaptive locking disc 7, the adaptive locking disc 7 is fixedly arranged on the main shaft 5 and is located at the bottom of the drum assembly 3. A limit snap ring 8 is fixedly connected to the bottom of the drum assembly 3. When the main shaft 5 and the drum assembly 3 rotate, the adaptive locking disc 7 is used to cooperate with the limit snap ring 8 to fix the drum assembly 3.

[0032] In an embodiment of the present invention, the main structure of the device is similar to that of a conventional centrifuge. The feature lies in the improvement of the interior of the centrifugal chamber, which changes the connection mode between the conventional drum assembly 3 and the main shaft 5. By driving the connection disk 6 through the main shaft 5, the drum assembly 3 can be driven to rotate. During the rotation process, the adaptive locking disk 7 can automatically cooperate with the limit snap ring 8 at the bottom of the drum assembly 3 to lock the drum assembly 3. Its function is to improve the instability of the drum assembly 3 in a non-fixed connection state. When the main shaft 5 stops rotating, the main shaft 5 is only connected to the drum assembly 3 through the connection disk 6, and the entire drum assembly 3 can be easily taken out. At this time, it is obviously more convenient to clean the filter cake in the drum assembly 3. Therefore, on the basis of realizing the stable rotation of the drum assembly 3, the installation of the drum assembly 3 is more flexible, and the daily cleaning work is also easier to carry out.

[0033] In an example of the present invention, as Figure 2 and Figure 3 shown, a dosing pipe 9 for conveying materials is fixedly connected to the cover assembly 4, and one end of the dosing pipe 9 located inside the cylinder 2 is also inside the drum assembly 3. The top of the drum assembly 3 is an open structure. A sunken collection tank 10 is provided at the edge of the bottom of the cylinder 2. A discharge port 11 is opened in the collection tank 10, and the discharge port 11 is communicated with a discharge pipe 12 fixedly connected to the base 1. The liquid of potassium phosphate can be conveyed into the drum assembly 3 through the dosing pipe 9. After the centrifugal action of the drum assembly 3, the liquid will be thrown out, while the impurities will remain in the drum assembly 3. Because a sunken collection tank 10 is provided at the bottom of the cylinder 2, the liquid can be more easily discharged from the discharge pipe 12; as Figure 2 shown, the driving assembly includes a driving member 16 fixedly connected to the base 1 and located on one side of the cylinder 2. The driving member 16 is connected to the main shaft 5 through a transmission member 17 located at the bottom of the base 1, and the rotation speed of the main shaft 5 is greater than the output rotation speed of the driving member 16. The driving member 16 can adopt the same motor as that of the existing centrifuge. The transmission member 17 can adopt the form of belt transmission, and of course, it can also adopt the form of chain transmission. The structural composition of this part is relatively conventional, so it will not be described in detail. It should be noted that the driving member 16 in this device can adjust the rotation speed of the drum assembly 3, mainly to cooperate with the working process of the adjustable blowing assembly 13.

[0034] As Figure 4 and Figure 5As shown, as a preferred embodiment of the present invention, the drum assembly 3 is a cylindrical structure with arranged filter holes on its side surface facing the side wall of the cylinder body 2. A plurality of positioning holes 601 are evenly distributed on the connecting disk 6, and a plurality of positioning columns 301 corresponding to the positioning holes 601 are fixedly connected to the bottom of the drum assembly 3. When the connecting disk 6 is connected to the drum assembly 3, the positioning columns 301 are located within the positioning holes 601. The limit retaining ring 8 is located outside the connecting disk 6, and the contour diameters of both the limit retaining ring 8 and the adaptive locking disk 7 located on the main shaft 5 are smaller than the contour diameter of the drum assembly 3.

[0035] In one case of this embodiment, as Figure 6 shown, the adaptive locking disk 7 includes a disk body 701 fixedly sleeved on the main shaft 5. A plurality of sliding grooves 702 arranged radially along the disk body 701 are evenly distributed on the disk body 701. A moving block 703 is slidably connected within the sliding grooves 702. A claw 704 for cooperating with the limit retaining ring 8 is fixedly connected to the moving block 703. An elastic reset member 705 connected to the moving block 703 is further provided within the sliding grooves 702. A sealing ring 706 is fixedly connected to the edge of the disk body 701, and the sealing ring 706 is located outside the limit retaining ring 8. The elastic reset member 705 can be in the form of a spring, and of course, it can also be in the form of an elastic telescopic rod. When the taken-out drum assembly 3 needs to be installed, after opening the cover assembly 4, the drum assembly 3 can be placed on the connecting disk 6. By adjusting the position, the positioning columns 301 are made to enter the positioning holes 601, and the preliminary installation of the drum assembly 3 is completed. The liquid of ammonium phosphate is added to the drum assembly 3, and the main shaft 5 is controlled to start by the driving assembly. During this process, the drum assembly 3 may be unstable during the rotation acceleration stage. At this time, the moving block 703 will be thrown to the outside, and the claw 704 will fix the limit retaining ring 8 from the inside, enabling a stable connection between the drum assembly 3 and the main shaft 5, thereby ensuring the stable progress of centrifugal separation. When the impurity removal work is completed, the drum assembly 3 will stop rotating. At this time, the moving block 703 will automatically reset. Currently, only the connecting disk 6 on the main shaft 5 cooperates with the drum assembly 3. At this time, if the drum assembly 3 needs to be taken, it is very convenient. To sum up, the drum assembly 3 in this device can be stably connected during operation, and the stable structural connection can be released after stopping, which very much meets the actual requirements for cleaning the filter cake. The function of the sealing ring 706 is to prevent the splashing liquid from entering the disk body 701, thereby affecting the function of the adaptive locking disk 7.

[0036] As Figure 1 、 Figure 2 and Figure 7 shown, as a preferred embodiment of the present invention, an adjustable air-blowing assembly 13 is provided on the cover assembly 4, and the adjustable air-blowing assembly 13 is used to blow air into the drum assembly 3 through the arranged filter holes.

[0037] In one case of the present embodiment, a circular hole 401 is provided on the sealing component 4, and the adjustable blowing component 13 includes a straight pipe 1301 located in the circular hole 401 and in a vertical state, one end of the straight pipe 1301 located in the cylinder 2 is fixedly connected to an arc-shaped closed cover 1302 arranged toward the side of the drum component 3, and the arc-shaped closed cover 1302 is located between the drum component 3 and the side wall of the cylinder 2, and an air pipe 1303 connected to an external air supply system is arranged on the top of the straight pipe 1301, and a horizontally arranged cross frame 1304 is fixedly connected to the top of the straight pipe 1301, and both ends of the cross frame 1304 are fixedly connected to telescopic members 1305 facing the sealing component 4 and in a vertical state, and the telescopic members 1305 can be adopted In the form of electric telescopic or hydraulic telescopic, the bottom of the telescopic member 1305 is fixedly connected with a driving slide 1306, and the driving slide 1306 is matched with a guide rail 1307 fixedly connected to the cover assembly 4. The guide rails 1307 on both sides are distributed along the radial direction of the cover assembly 4. The telescopic member 1305 is used to drive the arc-shaped closure cover 1302 to move in the vertical direction in the cylinder 2, and the driving slide 1306 is used to drive the arc-shaped closure cover 1302 to move in the horizontal direction in the cylinder 2. Generally speaking, the drum structure of the centrifuge needs to be used with filter paper. If the filter cake is in direct contact with the inner wall of the drum, the filter cake will inevitably be difficult to remove, and even need to be processed with a scraper. If there is filter paper blocking the filter cake and the inner wall of the drum, it can not only The degree of separation can be improved and the filter cake can be easier to clean. However, the filter paper will also be tightly attached to the inner wall of the drum, and cleaning is not easy. The adjustable blowing component 13 in this embodiment solves this problem. The specific working process is used to illustrate. When there are more filter cakes remaining in the drum assembly 3 and the efficiency of impurity separation is affected, the arc-shaped closing cover 1302 is controlled to move downward by the telescopic member 1305 (when the drum assembly 3 is in the working state, the arc-shaped closing cover 1302 is located above the cylinder 2 and will not affect its work). After the arc-shaped closing cover 1302 is driven to move horizontally by the driving slide 1306, it can be attached to the outer wall of the drum assembly 3. At this time, blowing will cause airflow to enter the drum assembly 3. Thereby, the filter paper is promoted to separate from the inner wall of the drum assembly 3. By controlling the rotation of the drum assembly 3 and the up and down movement of the arc-shaped closing cover 1302, the outer wall of the drum assembly 3 can be blown in turn. The main purpose is to increase the gap between the filter paper and the inner wall of the drum assembly 3, so that the filter paper and the filter cake can be more easily taken out. The straight-through pipe 1301 is slidably sleeved with a mounting ring 14, and the mounting ring 14 is fixedly connected with a sealing film 15 connected to the circular hole 401. This solves the problem of insufficient sealing of the entire cylinder 2 without affecting the movement of the straight-through pipe 1301. In addition, the protective cover 18 for isolating the adjustable blowing assembly 13 is fixedly connected to the cover assembly 4, which serves as a safety protection for the operator of the device.

[0038] It is obvious to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, in any aspect, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

[0039] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0040] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An impurity removal device for the production of food-grade potassium phosphate salts, comprising a base (1), characterized in that, It further includes: A centrifugal chamber located on one side of the base (1). The centrifugal chamber includes a cylinder body (2) fixedly arranged on the base (1) and a drum assembly (3) located inside the cylinder body (2). A cover assembly (4) is arranged at the top of the cylinder body (2). A main shaft (5) is rotatably arranged at the center of the inner bottom of the cylinder body (2). A connection disk (6) for connecting to the bottom of the drum assembly (3) is fixedly connected to the top of the main shaft (5). When the connection disk (6) is connected to the drum assembly (3), the movement of the drum assembly (3) in the vertical direction is not restricted. A driving assembly located on the base (1) and used to drive the main shaft (5) and the drum assembly (3) inside the cylinder body (2) to rotate. An adaptive locking disk (7) fixedly arranged on the main shaft (5) and located at the bottom of the drum assembly (3). A limiting clamping ring (8) is fixedly connected to the bottom of the drum assembly (3). When the main shaft (5) and the drum assembly (3) rotate, the adaptive locking disk (7) is used to cooperate with the limiting clamping ring (8) to fix the drum assembly (3).

2. The impurity removal device for food-grade potassium phosphate production according to claim 1, characterized in that, A dosing pipe (9) for conveying materials is fixedly connected to the cover assembly (4), and one end of the dosing pipe (9) located inside the cylinder body (2) is also inside the drum assembly (3). The top of the drum assembly (3) is an open structure. A sunken collection tank (10) is arranged at the edge of the bottom of the cylinder body (2). A discharge port (11) is opened in the collection tank (10), and the discharge port (11) is communicated with a discharge pipe (12) fixedly connected to the base (1).

3. The impurity removal device for food-grade potassium phosphate production according to claim 1, characterized in that, The drum assembly (3) is a cylindrical structure with distributed filter holes on the side facing the side wall of the cylinder body (2). A plurality of positioning holes (601) are evenly distributed on the connection disk (6). A plurality of positioning columns (301) corresponding to the positioning holes (601) are fixedly connected to the bottom of the drum assembly (3). When the connection disk (6) is connected to the drum assembly (3), the positioning columns (301) are located inside the positioning holes (601). The limiting clamping ring (8) is located outside the connection disk (6), and the contour diameters of both the limiting clamping ring (8) and the adaptive locking disk (7) located on the main shaft (5) are smaller than the contour diameter of the drum assembly (3). An adjustable air-blowing assembly (13) is arranged on the cover assembly (4), and the adjustable air-blowing assembly (13) is used to blow air into the drum assembly (3) through the distributed filter holes.

4. The impurity removal device for the production of food-grade potassium phosphate salts according to claim 3, characterized in that, The adaptive locking disk (7) includes a disk body (701) fixedly sleeved on the main shaft (5). A plurality of sliding grooves (702) arranged radially along the disk body (701) are evenly distributed on the disk body (701). A moving block (703) is slidably connected in the sliding grooves (702). A clamping claw (704) for cooperating with the limiting clamping ring (8) is fixedly connected to the moving block (703). An elastic resetting member (705) connected to the moving block (703) is also arranged in the sliding grooves (702). A sealing ring (706) is fixedly connected to the edge of the disk body (701), and the sealing ring (706) is located outside the limiting clamping ring (8).

5. The impurity removal device for the production of food-grade potassium phosphate salts according to claim 3, characterized in that, A circular hole (401) is formed in the cover assembly (4). The adjustable air-blowing assembly (13) includes a straight pipe (1301) that is located within the circular hole (401) and is in a vertical state. One end of the straight pipe (1301) located within the cylinder body (2) is fixedly connected to an arc-shaped closed cover (1302) that is arranged facing the side of the drum assembly (3). The arc-shaped closed cover (1302) is located between the drum assembly (3) and the side wall of the cylinder body (2). A trachea (1303) connected to an external air supply system is provided at the top of the straight pipe (1301). A horizontally arranged cross frame (1304) is fixedly connected to the top of the straight pipe (1301). Telescopic members (1305) that are arranged facing the cover assembly (4) and are in a vertical state are fixedly connected to both ends of the cross frame (1304). The bottom of the telescopic member (1305) is fixedly connected to a driving slider (1306). The driving slider (1306) is in mating connection with a guide rail (1307) fixedly connected to the cover assembly (4). The two guide rails (1307) are distributed along the radial direction of the cover assembly (4). The telescopic member (1305) is used to drive the arc-shaped closed cover (1302) to move vertically within the cylinder body (2), and the driving slider (1306) is used to drive the arc-shaped closed cover (1302) to move horizontally within the cylinder body (2).

6. The impurity removal device for the production of food-grade potassium phosphate salt according to claim 5, characterized in that, An installation ring (14) is slidably sleeved on the straight pipe (1301). A sealing rubber film (15) connected to the circular hole (401) is fixedly connected to the installation ring (14).

7. The impurity removal device for the production of food-grade potassium phosphate salt according to claim 1, characterized in that, The driving assembly includes a driving member (16) that is fixedly connected to the base (1) and is located on one side of the cylinder body (2). The driving member (16) is connected to the main shaft (5) through a transmission member (17) located at the bottom of the base (1), and the rotational speed of the main shaft (5) is greater than the output rotational speed of the driving member (16).

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