A lifting agitator and filter tank

Abstract

This utility model relates to the field of sodium pyrophosphate production and processing technology, and discloses a lifting agitator and filter tank, including a mixing box. A guide frame is provided on one side of the mixing box. The mixing structure is rotatably arranged inside the mixing box. The mixing structure includes a guide cylinder, a keyway rod, a cooperating ring, a shaft, a mixing rod, a mixing paddle, and a feeding rod. The guide cylinder is movably arranged above the mixing box. The keyway rod is rotatably arranged inside the guide cylinder. The cooperating ring is fixedly arranged above the shaft and slidably sleeved on the keyway rod. The mixing rod, the mixing paddle, and the feeding rod are all fixedly arranged at the bottom of the shaft. The shaft rotates under the drive of a motor and generates axial spiral motion under the linkage of the double spiral cylinder and the cooperating ring. The mixing rod forms a mixing and stirring action. The diamond-shaped blades of the feeding rod form a high-frequency shearing zone under high-speed rotation, which initially breaks down the crystal blocks. The spiral blades of the mixing paddle forcefully convey the material, thereby fundamentally solving the problems of mixing dead zones and unevenness.

Description

Technical Field

[0001] This utility model belongs to the field of sodium pyrophosphate production and processing technology, specifically, it relates to a lifting stirrer and a filter tank. Background Technology

[0002] Filtration is an indispensable step in the production of sodium pyrophosphate, used to separate solid sodium pyrophosphate from the mother liquor. Currently, most filter tanks used in production are equipped with lifting agitators to prevent solid particles from settling and the filter screen from clogging.

[0003] The prior art discloses a filter tank with a lifting agitator (CN206676050U), which includes a filter tank body, a slag discharge port on the left side wall of the filter tank body, a drain outlet on the right side wall of the filter tank body, and a stirring box on the top left side of the filter tank body, which is connected to the filter tank body. Compared with the existing filter tank with a lifting agitator, this utility model has a simple structure and is easy to operate. This utility model adds an electric heater and a temperature sensor to the existing filter tank with a lifting agitator. During the stirring process of crude sodium pyrophosphate slurry, the crude sodium pyrophosphate slurry is heated, which accelerates the dissolution rate of the crude sodium pyrophosphate slurry, thereby reducing the effective components in the solid residue and improving the utilization rate of crude sodium pyrophosphate.

[0004] Research revealed that the viscosity of sodium pyrophosphate varies greatly during production, especially during the cooling and crystallization stage, where uneven crystallization blocks are easily formed. Existing technologies using fixed stirring blades are unable to effectively break up these crystallization blocks, leading to dead zones and uneven mixing. Furthermore, sodium pyrophosphate crystals tend to form a dense layer on the surface of the filter screen. Existing technologies use inclined filter screens in the filter tank, but under the influence of gravity, a small amount of crystals still tend to stagnate on the filter screen pores, causing blockage and reducing production efficiency.

[0005] In view of this, this utility model is hereby proposed. Utility Model Content

[0006] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by this utility model is as follows: A lifting mixer includes a mixing tank, and a guide frame is provided on one side of the mixing tank; The stirring structure is rotatably disposed within a mixing tank. The stirring structure includes a guide cylinder, a keyway rod, a cooperating ring, a shaft, a stirring rod, a mixing paddle, and a feeding rod. The guide cylinder is movably disposed above the mixing tank. The keyway rod is rotatably disposed within the guide cylinder. The cooperating ring is fixedly disposed above the shaft and slidably sleeved on the keyway rod. The stirring rod, mixing paddle, and feeding rod are all fixedly disposed at the bottom of the shaft.

[0007] In a preferred embodiment of this utility model, a hydraulic cylinder is fixedly installed on the inner bottom surface of the guide frame, a lifting beam is slidably provided on the top of the guide frame, the output end of the hydraulic cylinder is connected to one end of the bottom surface of the lifting beam, and the stirring structure is rotatably arranged on the end of the lifting beam away from the guide frame.

[0008] In a preferred embodiment of this utility model, a motor is fixedly installed on the top surface of the end of the lifting beam away from the guide frame, and a guide cylinder is fixedly installed on the bottom surface of the end of the lifting beam away from the guide frame, with the guide cylinder located directly below the motor.

[0009] In a preferred embodiment of this utility model, the output end of the motor is connected to the top of the keyway rod via a coupling. The keyway rod is rotatably disposed at the end of the lifting beam away from the guide frame. The keyway rod is rotatably embedded in the guide cylinder. The cooperating ring is slidably embedded between the guide cylinder and the keyway rod.

[0010] In a preferred embodiment of this utility model, a double helical cylinder is fixedly provided on the inner side of the guide cylinder. The double helical cylinder is embedded between the cooperating ring and the guide cylinder. A linkage cylinder is fixedly provided on the bottom surface of the cooperating ring. A shaft is fixedly connected to the bottom surface of the linkage cylinder. The linkage cylinder is sleeved on the keyway rod. The linkage cylinder slides between the double helical cylinder and the keyway rod.

[0011] In a preferred embodiment of this utility model, a stirring rod, a mixing paddle, and a feeding rod are sequentially installed on the bottom curved surface of the shaft. The stirring rod array is fixed in two rows, with four stirring rods in each row. The end of the stirring rod away from the shaft is U-shaped, and a silicone scraper is fixed inside the U-shaped end of the stirring rod by bolts.

[0012] In a preferred embodiment of this utility model, the mixing paddle is composed of multiple spiral blades, the feeding rod has an I-shaped cross-section, and both ends of the feeding rod are composed of multiple rhomboid blades, which are arranged in a ring array.

[0013] A filter tank includes a filter tank, in which all of the above-mentioned lifting agitators are installed. The top two ends of the filter tank are respectively fixedly connected to a mixing box and a guide frame. A filter screen is installed inside one end of the filter tank. A slag discharge port and a drain outlet are respectively installed on the outer sides of both ends of the filter tank. The slag discharge port and the drain outlet are symmetrically arranged. The filter screen is located directly below the mixing box.

[0014] Compared with the prior art, the present invention has the following advantages: 1. The shaft of this utility model rotates under the drive of a motor, and generates axial spiral motion under the linkage of the double spiral drum and the cooperating ring. This expands the motion trajectory of the stirring rod, mixing paddle and material pusher rod from a simple cylindrical surface to a dynamically changing telescopic rotation. The rhomboid blades of the material pusher rod form a high-frequency shearing zone under high-speed rotation, which initially breaks down the crystal blocks. Subsequently, the spiral blades of the mixing paddle forcefully convey the material, further dispersing and grinding the crystal particles during the flow process. Its range of action can reach every corner of the filter tank, especially near the filter screen, and forcefully agitate the material that is close to stagnation due to gravity, thereby fundamentally solving the problems of dead corners and uneven mixing.

[0015] 2. During the descent of the stirring structure, the silicone scraper fixed to the end of the stirring rod, driven by the spiral motion of the shaft, does not simply press vertically against the filter screen, but rather sweeps across the filter screen and the surface of the mixing tank in a reciprocating up-and-down and rotating scraping manner. The silicone material ensures the scraping effect while avoiding damage to the metal filter screen. This process is carried out automatically and continuously during normal stirring and filtration operations without the need for machine shutdown for special cleaning. It directly solves the pain point of reduced production efficiency caused by filter pore blockage in the background technology, ensuring the continuity and high efficiency of the filtration process.

[0016] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings. Attached Figure Description

[0017] In the attached diagram: Figure 1 This is a cross-sectional view of the overall structure of this utility model; Figure 2 This is a schematic diagram showing the placement of the guide frame and hydraulic rod of this utility model; Figure 3 This is a schematic diagram of the stirring structure of this utility model; Figure 4 This is a disassembled schematic diagram of the stirring structure of this utility model; Figure 5 This is a schematic diagram showing the disassembled state of the guide tube of this utility model.

[0018] In the diagram: 10. Mixing tank; 11. Filter tank; 12. Slag discharge port; 13. Drain outlet; 14. Filter screen; 15. Guide frame; 16. Hydraulic cylinder; 17. Lifting beam; 18. Motor; 19. Guide cylinder; 20. Keyway rod; 21. Coordinating ring; 22. Linkage cylinder; 23. Shaft; 24. Mixing rod; 25. Mixing paddle; 26. Feeding rod; 27. Silicone scraper; 28. Double spiral drum. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this utility model.

[0020] A lifting agitator, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, including The mixing tank 10 is a rectangular box with an opening at one end of the top. The mixing tank 10 has a reserved channel inside for the mixing structure to pass through. The top side is provided with an inlet for guiding the sodium pyrophosphate liquid into the filter tank 11. A guide frame 15 is provided on one side of the mixing tank 10. The guide frame 15 is a rectangular box structure. Its bottom surface is fixed to the top surface of the filter tank 11 away from the mixing tank 10. The interior is hollow for installing the components that drive the mixing structure to lift and lower. The stirring structure is rotatably disposed within the mixing tank 10. The stirring structure includes a guide cylinder 19, a keyway rod 20, a cooperating ring 21, a shaft 23, a stirring rod 24, a mixing paddle 25, and a material-pushing rod 26. The guide cylinder 19 is movably disposed above the mixing tank 10. The keyway rod 20 is rotatably disposed within the guide cylinder 19. The cooperating ring 21 is fixedly disposed above the shaft 23 and is slidably sleeved on the keyway rod 20. The stirring rod 24, the mixing paddle 25, and the material-pushing rod 26 are all fixedly disposed at the bottom of the shaft 23.

[0021] First, this embodiment is specifically designed for the stirring of the liquid and the solid-liquid filtration process after cooling and crystallization in the production of sodium pyrophosphate. The whole is composed of two parts: a lifting stirrer and a filter tank 11. The materials of each component are preferably corrosion-resistant 316L stainless steel, and the easily worn or sealed parts are made of polytetrafluoroethylene or food-grade silicone.

[0022] like Figure 1 and Figure 2 As shown, a hydraulic cylinder 16 is fixedly installed on the inner bottom surface of the guide frame 15, and a lifting beam 17 is slidably provided on the top of the guide frame 15. The output end of the hydraulic cylinder 16 is connected to one end of the bottom surface of the lifting beam 17, and the stirring structure is rotatably set on the end of the lifting beam 17 away from the guide frame 15.

[0023] Specifically, based on the viscosity of the sodium pyrophosphate solution detected by external equipment, the initial speed of the motor 18 is set by the frequency converter, and the piston rod of the hydraulic cylinder 16 is controlled to extend to the maximum stroke, so that the lifting beam 17 is in the highest position, and the shaft 23 drives the stirring component to rise to the highest position, which facilitates the injection of the solution.

[0024] like Figure 1 and Figure 2As shown, a motor 18 is fixedly installed on the top surface of the end of the lifting beam 17 away from the guide frame 15 via a motor bracket. The output end of the motor 18 faces downward. The motor 18 uses a variable frequency reduction motor, and its speed can be adjusted by the built-in frequency converter to adapt to sodium pyrophosphate liquid of different viscosities. A guide cylinder 19 is fixedly installed on the bottom surface of the end of the lifting beam 17 away from the guide frame 15. The guide cylinder 19 is a cylindrical structure and is coaxially located directly below the motor 18. like Figure 3 , Figure 4 and Figure 5 As shown, the output end of the motor 18 is connected to the top of the keyway rod 20 through a coupling. The keyway rod 20 is a cylindrical rod. The keyway rod 20 is rotatably set at the end of the lifting beam 17 away from the guide frame 15. The middle and lower parts of the keyway rod 20 are rotatably embedded in the guide cylinder 19. A keyway is provided on the keyway rod 20. The inner side of the cooperating ring 21 is provided with a protrusion that matches the keyway. The keyway and the protrusion of the cooperating ring 21 cooperate to transmit rotational power. The outer side of the cooperating ring 21 is provided with a sliding column that matches the spiral groove of the double spiral cylinder 28. The cooperating ring 21 is slidably embedded between the guide cylinder 19 and the keyway rod 20. like Figure 3 , Figure 4 and Figure 5 As shown, a double spiral cylinder 28 is fixedly provided on the inner side of the guide cylinder 19. The outer wall of the double spiral cylinder 28 is welded and fixed to the inner wall of the guide cylinder 19. A spiral groove resembling a parallelogram is opened on the double spiral cylinder 28 to guide the sliding column of the cooperating ring 21 to slide along the spiral groove, thereby realizing the lifting and lowering of the shaft 23. The double spiral cylinder 28 is embedded between the cooperating ring 21 and the guide cylinder 19. A linkage cylinder 22 is fixedly provided on the bottom surface of the cooperating ring 21. The shaft 23 is fixedly connected to the bottom surface of the linkage cylinder 22. The linkage cylinder 22 is sleeved on the keyway rod 20. The linkage cylinder 22 slides between the double spiral cylinder 28 and the keyway rod 20. The cooperating ring 21 drives the linkage cylinder 22 to realize the transmission of power to the shaft 23, thereby realizing the sliding of the stirring structure along the axial direction of the keyway rod 20 and the synchronous rotation with the keyway rod 20.

[0025] Specifically, the cooled and crystallized sodium pyrophosphate solution is slowly injected through the top inlet of the mixing tank 10. The solution flows into the filter tank 11 along the mixing tank 10 until the solution level reaches the limit height of the filter tank 11, at which point the injection is stopped. The motor 18 is started, and the stirring structure begins to rotate. At the same time, the piston rod of the hydraulic cylinder 16 is slowly retracted, causing the stirring structure to gradually descend. When the silicone scraper 27 of the stirring rod 24 contacts the solution, the hydraulic cylinder 16 stops at a suitable middle position for mixing, maintaining this stirring depth. During this period, the state of the solution is observed through the external observation window on the mixing tank 10. If there are still obvious large crystals, the speed of the motor 18 can be increased. If the solution is uniform and without obvious lumps, the filtration stage begins.

[0026] like Figure 3 and Figure 4 As shown, the lower part of the shaft 23 extends vertically into the filter tank 11. The bottom curved surface of the shaft 23 is sequentially equipped with a stirring rod 24, a mixing paddle 25, and a feeding rod 26. The stirring rods 24 are fixed in two rows, with four stirring rods in each row. The end of the stirring rod 24 away from the shaft 23 is U-shaped. A silicone scraper 27 is fixed inside the U-shaped end of the stirring rod 24 by bolts. There is a small gap between the outer side of the silicone scraper 27 and the inner wall of the filter tank 11, which is used to scrape off the sodium pyrophosphate crystals attached to the tank wall. like Figure 3 and Figure 4 As shown, the mixing paddle 25 consists of multiple spiral blades made of 316L stainless steel with a polished surface. These blades are used to agitate the liquid and prevent dead zones in the mixing process. The material-pushing rod 26 has an I-shaped cross-section. The middle of the material-pushing rod 26 is connected to the diamond-shaped blade groups at both ends via a connecting rod. The bottom of the shaft 23 has a through hole, and the connecting rod is rotatably connected to the bottom through hole of the shaft 23 via a sealed bearing. Both ends of the material-pushing rod 26 consist of multiple diamond-shaped blades arranged in a ring array to break up the sodium pyrophosphate clumps at the bottom of the mixing tank 10 and prevent clogging of the filter screen 14.

[0027] Specifically, while maintaining the operating speed of motor 18, slowly open the manual gate valve of discharge port 12. The sodium pyrophosphate filter residue on filter screen 14, propelled by the feeding rod 26, slides along the inclined surface of filter screen 14 towards discharge port 12 and is discharged into the external filter residue collection container. During the discharge process, the piston rod of hydraulic cylinder 16 is slowly retracted, causing the feeding rod 26 to gradually descend to its lowest point. The stirring structure is slightly higher than the top inclined surface of filter screen 14 to avoid excessive wear and to assist in the discharge of filter residue. If discharge port 12 becomes blocked, motor 18 can be briefly turned off. 8. When the rotation speed is increased, the material liquid flows rapidly due to the strong agitation of the material-pulling rod 26, thereby causing the filter residue to float. Then, the filtration process is repeated to clear the slag discharge port. After the filter residue is completely discharged, the manual gate valve of the slag discharge port 12 is closed, the motor 18 is stopped, and the piston rod of the hydraulic cylinder 16 is extended to the maximum stroke to reset the stirring component to the highest position, completing one production cycle. If continuous production is required, the steps can be repeated. If the machine is to be shut down for a long time, the filter tank 11 and the stirring structure should be rinsed with clean water to remove residual sodium pyrophosphate liquid and prevent crystallization and blockage of the components.

[0028] A filter tank, such as Figure 1As shown, the device includes a filter tank 11. The aforementioned lifting agitator is installed inside the filter tank 11, enabling the device to achieve uniform mixing and improve production efficiency. The top two ends of the filter tank 11 are fixedly connected to a mixing box 10 and a guide frame 15, respectively. A filter screen 14 is installed at an angle of approximately 15° inside one end of the filter tank 11 to facilitate the sliding of filter residue towards the discharge port 12. Discharge ports 12 and drain ports 13 are installed on the outer sides of both ends of the filter tank 11, respectively. The discharge ports 12 and 13 are symmetrically arranged, and gate valves and check valves are installed on the discharge ports 12 and 13, respectively. The filter screen 14 is located directly below the mixing box 10 and within the mixing coverage area of ​​the mixing rod 24 and the mixing paddle 25, ensuring that the liquid is filtered while being stirred, reducing crystal deposition. The material-pulling rod 26 is located above the filter screen 14, and its rotation trajectory covers the effective filtration area of ​​the filter screen 14, allowing it to agitate the crystal particles on the filter screen in real time, preventing the formation of a dense filter layer.

[0029] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. A lifting agitator, characterized in that, include A mixing tank (10) is provided with a guide frame (15) on one side. The stirring structure is rotatably disposed inside the stirring tank (10). The stirring structure includes a guide cylinder (19), a keyway rod (20), a cooperating ring (21), a shaft (23), a stirring rod (24), a mixing paddle (25), and a material-pushing rod (26). The guide cylinder (19) is movably disposed above the stirring tank (10). The keyway rod (20) is rotatably disposed inside the guide cylinder (19). The cooperating ring (21) is fixedly disposed above the shaft (23) and is slidably sleeved on the keyway rod (20). The stirring rod (24), the mixing paddle (25), and the material-pushing rod (26) are all fixedly disposed at the bottom of the shaft (23).

2. The lifting agitator according to claim 1, characterized in that, A hydraulic cylinder (16) is fixedly installed on the inner bottom surface of the guide frame (15). A lifting beam (17) is slidably provided on the top of the guide frame (15). The output end of the hydraulic cylinder (16) is connected to one end of the bottom surface of the lifting beam (17). The stirring structure is rotatably set on the end of the lifting beam (17) away from the guide frame (15).

3. A lifting agitator according to claim 2, characterized in that, A motor (18) is fixedly installed on the top surface of the lifting beam (17) away from the guide frame (15), and a guide cylinder (19) is fixedly installed on the bottom surface of the lifting beam (17) away from the guide frame (15). The guide cylinder (19) is located directly below the motor (18).

4. A lifting agitator according to claim 3, characterized in that, The output end of the motor (18) is connected to the top of the keyway rod (20) via a coupling. The keyway rod (20) is rotatably disposed at the end of the lifting beam (17) away from the guide frame (15). The keyway rod (20) is rotatably embedded in the guide cylinder (19). The cooperating ring (21) is slidably embedded between the guide cylinder (19) and the keyway rod (20).

5. A lifting agitator according to claim 4, characterized in that, The inner side of the guide cylinder (19) is fixedly provided with a double helix cylinder (28), which is embedded between the cooperating ring (21) and the guide cylinder (19). The bottom surface of the cooperating ring (21) is fixedly provided with a linkage cylinder (22), and the bottom surface of the linkage cylinder (22) is fixedly connected to the shaft (23). The linkage cylinder (22) is sleeved on the keyway rod (20), and the linkage cylinder (22) slides between the double helix cylinder (28) and the keyway rod (20).

6. A lifting agitator according to claim 1, characterized in that, A stirring rod (24), a mixing paddle (25), and a feeding rod (26) are sequentially installed on the bottom curved surface of the shaft (23). The stirring rods (24) are arranged in two rows, with four stirring rods in each row. The end of the stirring rod (24) away from the shaft (23) is U-shaped, and a silicone scraper (27) is fixed inside the U-shaped end of the stirring rod (24) by bolts.

7. A lifting agitator according to claim 6, characterized in that, The mixing paddle (25) is composed of multiple spiral blades, and the feeding rod (26) has an I-shaped cross-section. Both ends of the feeding rod (26) are composed of multiple rhomboid blades, which are arranged in a ring array.

8. A filter tank, comprising a filter tank (11), characterized in that, The filter tank (11) is equipped with a lifting stirrer as described in any one of claims 1-7. The top two ends of the filter tank (11) are respectively fixedly connected to the stirring box (10) and the guide frame (15). A filter screen (14) is installed inside one end of the filter tank (11). A slag discharge port (12) and a drain outlet (13) are respectively installed on the outer sides of both ends of the filter tank (11). The slag discharge port (12) and the drain outlet (13) are symmetrically arranged. The filter screen (14) is located directly below the stirring box (10).

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