Efficient light and superfine powder mixing and stirring device

Abstract

The utility model relates to an efficient light and superfine powder mixing and stirring device which is characterized in that a guide cylinder, a stirring device I and a stirring device II are arranged in a lower tank body of a mixing tank, an outer shaft and an inner shaft positioned in the outer shaft are vertically and rotatably mounted on the guide cylinder, and the outer shaft and the inner shaft penetrate through the bottom of the mixing tank; the first stirring device is fixedly connected with an inner shaft at the lower end of the guide cylinder, the second stirring device is fixedly connected with an outer shaft of the guide cylinder and installed at the lower end of the first stirring device, the first stirring device is driven by an outer shaft driving device to rotate and stir materials to move, and the second stirring device is driven by an inner shaft driving device to rotate and stir materials to move. The light superfine powder mixing device has the advantages that the mixing efficiency of light superfine powder materials is improved through the first stirring device, the second stirring device and the scraping device, the materials can be powerfully suspended and stirred through the first stirring device, the first stirring device, the second stirring device and the scraping plate are all driven by the variable frequency motor, the mixing time is shortened, and the mixing efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of material mixing process and control technology in the refractory materials industry, and in particular to a high-efficiency lightweight and ultrafine powder mixing and stirring device. Background Technology

[0002] Existing material mixing technologies in the refractory materials industry generally use ordinary powder mixing equipment, including mixers and blenders, to mix the materials to be mixed. With the increasing demand for long service life and erosion resistance in refractory bricks from the refractory materials industry, refractory bricks made from ordinary powder mixtures and then pressed are difficult to meet the requirements of the steel industry. The successful development of lightweight and ultrafine powder materials in the refractory materials industry can solve the steel industry's requirement for long-life refractory bricks, but existing equipment is difficult to meet the requirements for uniform and efficient mixing of ultrafine powder materials used in the production of high-quality refractory bricks.

[0003] In the prior art, patent publication number CN211246283U, entitled "A Mixing and Stirring Device for Refractory Material Production," states that this patent "provides a technical solution: a mixing and stirring device for refractory material production, including a mixing tank 1, a stirring shaft 2, stirring blades 3, a scraper 4, a discharge plate 5, a baffle 6, a support plate 7, a feeding hole 8, a fixed column 9, a feeding mechanism 10, a storage hopper 11, and a toothed disc 12. The stirring shaft 2 is rotatably mounted on the upper middle part of the mixing tank 1, and the stirring blades 3 are welded and fixed to the outer side of the stirring shaft 2. The scraper 4 is integrally provided at the bottom end of the stirring shaft 2. The discharge plate 5 is provided at the lower end of the left side surface of the mixing tank 1, and the baffle 6 is installed inside the discharge plate 5. The support plate 7 is fixed to the upper end of the side wall of the mixing tank 1 by welding, and the upper surface of the mixing tank 1 is at equal angles." The device has a feeding hole 8, and a fixing column 9 fixed to the mixing tank 1 is provided on the outside of the feeding hole 8. A feeding mechanism 10 is installed on the outside of the fixing column 9 through a bearing. A toothed disc 12 is provided on the outside of the feeding mechanism 10. The storage hopper 11 is located above the feeding mechanism 10. The feeding mechanism 10 includes a feeding box 1001, a loading chamber 1002, a rubber pad 1003, and a sealing plate 1004. The loading chamber 1002 is reserved in the middle of the feeding box 1001. The rubber pad 1003 is attached and fixed to both the upper and lower surfaces of the feeding box 1001. The sealing plate 1004 is attached and fixed to the outer surface of the rubber pad 1003. This patented mixing device has only one stirring blade driven by a motor. It does not have an inlet for additives, water, or other auxiliary materials. It cannot perform complex mixing of multiple materials and additives, and the mixing efficiency of light and ultrafine powders is low. Summary of the Invention

[0004] The purpose of this invention is to provide a high-efficiency mixing and stirring device for lightweight and ultrafine powders, which improves the mixing efficiency of lightweight and ultrafine powder materials, and performs strong suspension stirring of the mixture, thereby improving its dispersibility and uniformity.

[0005] To achieve the above objectives, this utility model employs the following technical solution:

[0006] A high-efficiency lightweight and ultrafine powder mixing device includes a mixing tank, a first mixing device, a second mixing device, a guide cylinder, a discharge device, and a hopper. The guide cylinder, the first mixing device, and the second mixing device are located in the lower part of the mixing tank. An outer shaft and an inner shaft located within the outer shaft are vertically rotatably mounted on the guide cylinder, and the outer shaft and the inner shaft pass through the bottom of the mixing tank. The first mixing device is fixedly connected to the inner shaft at the lower end of the guide cylinder, and the second mixing device is fixedly connected to the outer shaft of the guide cylinder. The second mixing device is installed at the lower end of the first mixing device. The lower side of the mixing tank is connected to the discharge device, and the other end of the discharge device is connected to the hopper. The first mixing device is driven by the outer shaft drive device to rotate and agitate the material, and the second mixing device is driven by the inner shaft drive device to rotate and agitate the material. The mixing tank, the first mixing device, the second mixing device, the guide cylinder, and the outer and inner shafts of the guide cylinder are all located on the same vertical central axis.

[0007] The mixing device includes an upper impeller and a middle impeller, both of which are fixedly connected to the inner shaft of the guide tube. The middle impeller is located at the lower end of the upper impeller. The inner shaft drive device includes a variable frequency motor, which is located on one side of the mixing tank. The variable frequency motor is connected to the drive pulley of the upper impeller, and the lower end of the inner shaft is connected to the high-speed pulley of the inner shaft. A belt is installed between the drive pulley of the upper impeller and the high-speed pulley of the inner shaft. The variable frequency motor is used to drive the upper impeller and the middle impeller to rotate and stir the material. Both the upper impeller and the middle impeller are equipped with blades.

[0008] The second stirring device includes a low-speed lower impeller, and the outer shaft drive device includes a second variable frequency motor. The second variable frequency motor is located on one side of the mixing tank and is connected to the driving pulley of the low-speed lower impeller. The lower end of the outer shaft is connected to the low-speed pulley of the outer shaft. A second belt is installed between the driving pulley of the low-speed lower impeller and the low-speed pulley of the outer shaft. The second variable frequency motor is used to drive the low-speed lower impeller to rotate and stir the material. The low-speed lower impeller is equipped with blades.

[0009] It also includes a scraping device. The upper tank of the mixing tank is equipped with a scraping device, and the tank cover of the mixing tank is equipped with a scraping drive device. The main shaft of the scraping drive device is connected to the scraping device, and the scraping device is driven to rotate by the scraping drive device. The scraping drive device is a variable frequency motor, and the scraping device is a scraping plate with blades evenly arranged on the scraping plate.

[0010] The mixing tank consists of an upper tank and a lower tank. The upper tank is smaller and the lower tank is larger. The upper tank and the lower tank are sealed with a sealing ring.

[0011] The mixing tank lid includes a rotating mechanism and a crank-connecting rod mechanism. The rotating mechanism includes a drive shaft, ball bearings, bearing housings, end caps, bases, handles, and a base fixing plate. Ball bearings are installed inside the bearing housings. The drive shaft is connected to the bearing housings via ball bearings. The mixing tank lids are fixedly connected to the bearing housings. The bearing housings rotate together with the mixing tank lids. The end caps are fixedly connected to the bearing housings via bolts. The bases are fixedly connected to the base fixing plate via bolts. The vertical height of the drive shafts is adjusted via the handles.

[0012] The crank-connecting rod mechanism includes a crank-connecting rod, a spherical bearing, a door-opening drive cylinder, a cylinder base, a bearing housing, a bearing, an end cap, and a rotating shaft. The crank-connecting rod connects the door-opening drive cylinder to the mixing tank lid. The cylinder rod of the door-opening drive cylinder is connected to the crank-connecting rod via a spherical bearing. The cylinder body of the drive cylinder is connected to the cylinder base via a spherical bearing. The rotating shaft is hinged to the crank-connecting rod via a spherical bearing to support the opening and closing of the lid. The end cap is bolted to the rotating shaft, and the bearing is installed between the bearing housing and the rotating shaft. The door-opening drive cylinder drives the crank-connecting rod to open and close the mixing tank lid around the spherical bearing by extending and retracting the cylinder rod.

[0013] The discharge device is equipped with a discharge valve, which includes a cylinder body, a cylinder rod, and a pusher. The cylinder body is fixed on the discharge valve housing. The cylinder rod is used to drive the pusher to extend and retract. The bottom of the pusher rests against the mixing tank. The mixture in the mixing tank is not discharged. When the pusher retracts, the mixture in the mixing tank can be discharged into the material box through the chute below the pusher.

[0014] The mixing tank cover is equipped with main raw material inlet, auxiliary material inlet, binder inlet, wash water inlet, steam dust collection inlet, dust collection return inlet, air exhaust filter and dust collection inlet, additive inlet, and water inlet, and is connected to the corresponding control valves through pipelines.

[0015] A cylinder is installed on the hopper cover. The cylinder is used to drive the parallel four-bar linkage to open or close the hopper door.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] 1. Mixing device one and mixing device two are fixedly connected to the guide cylinder. Mixing device two is installed at the lower end of mixing device one. A scraper is installed in the upper tank of the mixing tank to improve the mixing efficiency of lightweight ultrafine powder materials. Mixing device one can strongly suspend and mix the materials. Mixing device one, mixing device two and scraper are all driven by variable frequency motors. The variable frequency motors are driven by corresponding frequency converters to reduce mixing time and improve mixing efficiency, so that the materials can be uniformly mixed in a short time.

[0018] 2. The mixing and stirring device is suitable for mixing various lightweight, mutually compatible ultrafine powders, as well as mixing immiscible particles, ensuring good dispersion and uniformity of the mixed media. The mixing process can also further refine the particles, resulting in efficient and uniform mixing. The mixing tank and discharge device are sealed, and the upper and lower tanks are sealed with a sealing ring, making the entire operation environmentally friendly and safe.

[0019] 3. The mixing tank consists of an upper tank and a lower tank, with the upper tank being smaller and the lower tank being larger. Lightweight materials, due to their low density, tend to concentrate at the top in a suspended state or adhere to the top. The small top area of ​​the mixing tank facilitates the drawing of these materials into the guide tube at the stirring center shaft, forcing them to participate in the mixing. A sealing ring is used between the upper and lower tanks to achieve a reliable seal. The tank body is made of stainless steel, which has strong corrosion resistance, a long service life, and is suitable for mixing various alkaline, acidic, and corrosive ultrafine powder media. Its excellent sealing performance also makes it fully suitable for mixing liquid media and mixing liquid and solid media.

[0020] 4. The low-speed impeller is located at the bottom of the mixing tank. It throws up the material near the blades of the low-speed impeller at the bottom and mixes the material around the tank wall with the material thrown and diffused by the upper and middle impellers. The low-speed impeller has a large circumferential radius, which improves the material tumbling effect, accelerates the suspension, refinement and diffusion of the material, increases the material contact area, and facilitates efficient mixing of different materials.

[0021] 5. The guide tube is located in the center of the tank and rotates together with the upper and middle impellers. This can greatly accelerate the mixing process of the ultrafine powder that is difficult to mix and is suspended at the top, thus improving the mixing efficiency. It is especially effective for mixing light and insoluble materials.

[0022] 6. A significant portion of the ultrafine powder agitated at high speed remains suspended at the top of the tank and does not participate in the material mixing, which seriously affects the mixing efficiency. The blades of the scraper device can return the suspended material at the top to the material mixing flow, thereby improving the mixing efficiency and the uniformity of the mixture.

[0023] 7. The mixing tank lid adopts a rotating mechanism and a crank-connecting rod mechanism to realize the opening and closing action of the mixing tank lid. The structure is simple, reduces the number of parts, and reduces the later maintenance cost.

[0024] 8. The cylinder air source comes from the air storage tank, ensuring a stable air supply. The pipeline pressure monitoring pressure switch ensures that an alarm signal is issued when the pipeline pressure exceeds the set range. Silencers are installed at the exhaust ports of each solenoid valve in the air circuit to ensure the personal safety of employees.

[0025] 9. A crank-parallel four-bar linkage mechanism is used to open and close the hopper cover. The drive uses a fast-acting cylinder as the power source to ensure that the mixed material is discharged into the hopper safely and reliably. Attached Figure Description

[0026] Figure 1 This is a front view of the layout of a high-efficiency lightweight and ultrafine powder mixing device.

[0027] Figure 2 This is a top view of the layout of a high-efficiency lightweight and ultrafine powder mixing device.

[0028] Figure 3 This is a side view of the layout of a high-efficiency lightweight and ultrafine powder mixing device.

[0029] Figure 4 This is a cross-sectional view of the mixing and stirring device.

[0030] Figure 5 This is a structural diagram of the mixing tank door.

[0031] Figure 6 This is a diagram of the rotating mechanism of the mixing tank lid BB.

[0032] Figure 7 This is a diagram of the CC crank-connecting rod mechanism of the mixing tank lid.

[0033] In the diagram: 1-Inner shaft (high-speed shaft) 2-Outer shaft (low-speed shaft) 3-Shaft box 4-Outer shaft bearing upper cover 5-Outer shaft bearing lower cover 6-Inner shaft high-speed pulley 7-Outer shaft low-speed pulley 8-Shaft collar and seal 9-Sleeve 10-Inner shaft bearing lower cover 11-Inner shaft bearing box 12-Sealing cover 13-Inner shaft pulley set nut 14-Bearing box 15-Outer shaft pulley set nut 16-Lubricating copper pipe 17-Lower impeller 18-Intermediate impeller 19 -Key 20- Upper impeller 21-Key 22- Lower impeller set nut 23-Impeller spacer ring 24- Upper impeller set nut 25-Sealing ring 26-Scraper blade 27-Bearing 28-Ball bearing 29-Double row roller bearing 30-Bearing 31-Shaft seal 32-Lower tank body 33-Upper tank body 34-Screw or propeller-type guide tube 35-Scraper blade bearing housing 36-Scraper blade drive motor reducer 37-Scraper blade 38-Upper impeller drive motor reducer 9-Upper impeller drive pulley; 40-Drive shaft; 41-Ball bearing; 42-Bearing housing; 43-End cover; 44-Base; 45-Handle; 46-Base fixing plate; 47-Crank connecting rod; 48-Spherical bearing; 49-Door opening drive cylinder; 50-Cylinder base; 51-Bearing housing; 52-Bearing; 53-End cover; 54-Rotating shaft; 55-Mixing tank cover; 101-Mixing tank cover, inlet / outlet; 102-Upper inlet / outlet of mixing tank; 103-Mixed material discharge valve device 104 - Upper impeller agitator; 105 - Bottom drain of mixing tank; 106 - Scraper; 107 - Lower impeller agitator; 108 - Lower impeller agitator drive pulley; 109 - Water addition port; 110 - Main raw material inlet; 111 - Wash water inlet; 112 - Dust collection return port; 113 - Steam dust collector inlet; 114 - Binder inlet; 115 - Binder inlet; 116 - Air exhaust filter and dust collector inlet; 117 - Secondary raw material inlet. Detailed Implementation

[0034] The present invention will now be described in detail with reference to the accompanying drawings. However, it should be noted that the implementation of the present invention is not limited to the following embodiments.

[0035] The following embodiments are implemented based on the technical solution of this utility model, providing detailed implementation methods and specific operation processes. However, the protection scope of this utility model is not limited to the following embodiments. Unless otherwise specified, the methods used in the following embodiments are conventional methods.

[0036]

Example 1

[0037] See Figure 1-4A novel, high-efficiency mixing and stirring device for lightweight and ultrafine powders includes a mixing tank (comprising a lower tank 32 and an upper tank 33), an upper high-speed stirring device, a lower impeller low-speed stirring device, a screw-type or propeller-type guide tube 34, a scraper device, a mixture discharge valve device, a pneumatic system, and a material tank cover opening and closing device. The mixing tank is a split trapezoidal arc tank, employing a split trapezoidal structure of the lower tank 32 and the upper tank 33 (with an internal volume of approximately 2m³). 3 The mixing tank is composed of an arc-shaped structure, wider at the bottom and narrower at the top, which is conducive to the mixing of lightweight materials. The joint between the lower tank 32 and the upper tank 33 is reliably sealed using a pressure-sealed ring and a stop structure. A scraping device is installed at the top of the mixing tank, which includes a scraper drive motor reducer 36, a scraper bearing, and a scraper 37 connected in sequence. The scraper bearing is located in the scraper bearing housing 35. A high-speed stirring impeller, a screw-type flow guide device 34, and a low-speed stirring impeller 17 are installed at the bottom of the mixing tank. The high-speed stirring impeller includes an upper impeller 20 and a middle impeller 18. The mixing tank body is made of stainless steel, which is highly corrosion-resistant, has a long service life, and is suitable for mixing various alkaline, acidic, and corrosive ultrafine powder media. The upper and lower tanks are sealed with a sealing ring, which is fully suitable for mixing liquid media and mixing liquid and solid media.

[0038] The high-speed stirring impeller is the main stirring and mixing drive part of the material mixing device. It is located at the bottom of the lower tank 32, and it throws the material near the upper impeller 20 and the middle impeller 18 at high speed to achieve high-speed throwing, generate shear force, accelerate the suspension, refinement and diffusion of the material, increase the material contact area, and facilitate the mixing of different materials. The low-speed stirring impeller 17 is located at the bottom of the tank, which makes the material tumble and mixes the material around the cylinder wall with the material thrown and diffused by the high-speed stirring impeller. Although the rotation speed of the low-speed stirring impeller 17 is lower, its circumferential radius is larger, so the shear force it brings to the material is also large, resulting in a good tumbling effect. The screw (or propeller) type guide tube 34 is located in the center of the tank and works in conjunction with the high-speed stirring impeller. When the wheels rotate together, the high-speed rotating propeller blades 34 inside the screw (or propeller) type guide tube generate a downward thrust, causing the material in the center of the mixing tank to form a concave material surface flow. This causes the material flow inside the guide tube to flow from top to bottom, accelerating the adsorption of light fine powder material floating on the material surface into the guide tube and moving downwards, thus accelerating the mixing process of light materials and improving mixing efficiency. The scraper device at the top of the mixing tank, driven by the variable frequency motor reducer 36, throws a considerable portion of the ultrafine powder material at high speed, which is suspended at the top of the upper tank 33 and does not participate in the material mixing, seriously affecting the mixing efficiency. The blades 37 of the upper scraper device can bring the material suspended at the top and edges back into the material mixing, improving the mixing efficiency and the uniformity of the mixing.

[0039] The upper impeller 20 and the middle impeller 18 each have 8 blades evenly distributed within a 360° circumference. The upper impeller 20 is driven by the upper impeller drive frequency conversion motor reducer 38, which drives the upper impeller drive belt pulley 39, the inner shaft high-speed belt pulley 6, and the inner shaft 1, which in turn drive the middle impeller 18 and the upper impeller 20 to rotate and stir the material.

[0040] The screw or propeller-type guide tube 34 is mounted on the upper impeller 20 and consists of a guide tube and a screw (or propeller) blade. The propeller blade or the propeller-type blade can be selected according to the material and mixing medium.

[0041] The low-speed lower impeller 17 has three anchor-shaped blades evenly distributed within its 360° circumference. The lower impeller drives the variable frequency motor reducer, which in turn drives the lower impeller drive pulley, the outer shaft low-speed pulley 7, and the outer shaft 2 to rotate the lower impeller 17 (composed of three blades evenly distributed within its 360° circumference) and stir the material at the bottom.

[0042] See Figure 5 , Figure 6 The mixing tank cover rotation device is fixed to the lower tank body via a lower base fixing plate 46 and a base 44, and a shaft seat 42 is fixed to the upper tank body. The upper and lower tank bodies can rotate relative to each other. The adjustment handle 45 can adjust the vertical position of the rotating shaft 40. The mixing tank cover rotation device includes a rotation mechanism and a crank-connecting rod mechanism, which are mounted on the mixing tank body. The rotation mechanism includes a drive shaft 40, ball bearings 41 and 42, bearing seats, an end cover 43, a base 44, a handle 45, and a base fixing plate 46. A ball bearing 41 is installed inside the bearing seat 42. The drive shaft 40 is connected to the bearing seat 42 via the ball bearing 41. The mixing tank cover is fixedly connected to the bearing seat 42. The bearing seat 42 rotates together with the mixing tank cover. The end cover 43 is fixedly connected to the bearing seat 42 via bolts. The base 44 is fixedly connected to the base fixing plate 46 via bolts. The vertical height of the drive shaft 40 is adjusted via the handle 45.

[0043] See Figure 5 , Figure 7The mixer door opening shaft seat is powered by the door opening drive cylinder 49 and is fixedly connected to the mixing tank cover through the crank connecting rod 47. The middle part of the crank connecting rod 47 forms a linkage mechanism with the bearing seat 51 and the rotating pulley 54 through the spherical bearing 48. The mixing tank cover is opened and closed. The bearing 52 supports the rotation. The end cover 53 controls the axial movement of the rotating shaft 54 ​​through the bearing 52. The crank-connecting rod mechanism includes a crank-connecting rod 47, a spherical bearing 48, a door-opening drive cylinder 49, a cylinder base 50, a bearing housing 51, a bearing 52, an end cap 53, and a rotating shaft 54. The crank-connecting rod 47 connects the door-opening drive cylinder 49 to the mixing tank lid. The cylinder rod of the door-opening drive cylinder 49 is connected to the crank-connecting rod 47 via a spherical bearing. The cylinder body of the drive cylinder 49 is connected to the cylinder base 50 via a spherical bearing, providing a relatively large swing margin. The rotating shaft 54 ​​is hinged to the crank-connecting rod 47 via a spherical bearing 48 to support the opening and closing of the lid. The end cap 53 is fixed to the rotating shaft 54 ​​with bolts. The bearing 52 is installed between the bearing housing 51 and the rotating shaft 54. The door-opening drive cylinder 49 drives the crank-connecting rod 47 to open and close the mixing tank lid around the spherical bearing 48 by extending and retracting the cylinder rod.

[0044] See Figure 2 The tank cover device shown is equipped with main raw material inlet, auxiliary raw material inlet, binder inlet, washing water inlet, water addition port, air exhaust filter and dust collection port, steam dust collection port, dust collection return port, mixing tank cover water inlet and outlet pipes, mixing tank upper water inlet and outlet port, mixing tank bottom drain pipe, and inspection door. The pneumatic valves connected to each inlet are required to be equipped with opening and closing limit switches. Due to the unique structure of this mixing tank, the connections between these inlets and the outside are all flexible connections.

[0045] The material bin cover opening and closing device adopts a crank parallel four-bar mechanism to open and close the material bin cover. It uses a fast-acting cylinder as the crank power source and uses limit switches to collect the opening and closing position signals of the material bin door to ensure that the mixed material is discharged into the material bin.

[0046] The mixture discharge valve device uses a cylinder-driven reciprocating movement method to discharge materials. The discharge device is equipped with a reciprocating push limit switch and a vibration discharge device to ensure the reliability of discharge and improve the discharge efficiency.

[0047] The discharge device is equipped with a discharge valve, which includes a cylinder body, a cylinder rod, and a pusher. The cylinder body is fixed on the discharge valve housing. The cylinder rod is used to drive the pusher to extend and retract. The bottom of the pusher rests against the mixing tank. The mixture in the mixing tank is not discharged. When the pusher retracts, the mixture in the mixing tank can be discharged into the material box through the chute below the pusher. The discharge is achieved by using a cylinder to drive the pusher to achieve reciprocating movement, which ensures the reliability of discharge and improves the discharge efficiency.

[0048] Work process:

[0049] Stirring device one uses high-speed rotation, while stirring device two uses low-speed rotation;

[0050] The mixing device throws the material in the lower tank up at high speed, generating shear force to accelerate the suspension, refinement and diffusion of the material, and increase the material contact area.

[0051] The second mixing device mixes the material around the cylinder wall with the material thrown and dispersed by the first mixing device. Since the diameter of the rotating blades used in the second mixing device is larger than that in the first mixing device, the second mixing device exerts a greater shear force on the material than the first mixing device, which is used to accelerate the tumbling of the material.

[0052] The guide tube is located in the center of the tank and rotates together with the stirring device. The upper and middle impellers generate downward thrust, and the material in the center of the mixing tank forms a concave material surface flow, so that the material flow in the guide tube flows from top to bottom, accelerating the light fine powder material floating on the material surface to be adsorbed into the guide tube and move downward, which is used to accelerate the mixing process of light materials.

[0053] The ultrafine powder that is thrown up at high speed is partially suspended at the top of the upper tank. The blades of the scraper device bring the material suspended at the top and edge back into the material mixing process, thereby increasing the mixing efficiency and uniformity.

[0054] This utility model has two mixing devices, namely mixing device 1 and mixing device 2, which are fixedly connected to the guide cylinder. Mixing device 2 is installed at the lower end of mixing device 1. A scraper is installed in the upper part of the mixing tank, which improves the mixing efficiency of lightweight ultrafine powder materials. Mixing device 1 can strongly suspend and stir the material. Mixing device 1, mixing device 2, and scraper are all driven by variable frequency motors. The variable frequency motors are driven by corresponding frequency converters, which reduces the mixing time and improves the mixing efficiency. The material can be uniformly mixed in a short time. The mixing device is suitable for mixing various lightweight, mutually compatible meson ultrafine powders, and is also suitable for mixing immiscible mesons. It makes the dispersion and uniformity of the mixed media good. The mixing process can also further refine the particles, and the mixing is efficient and uniform. The mixing tank and discharge device are sealed, with a sealing ring between the upper and lower tanks. The entire operation is environmentally friendly and safe. The mixing tank consists of an upper tank and a lower tank, with the upper tank being smaller and the lower tank larger. Lightweight materials, due to their low density, tend to concentrate at the top in a suspended state or adhere to the top. The small top area of ​​the mixing tank facilitates the drawing of these materials into the guide tube at the mixing center shaft, forcing them to participate in the mixing. A reliable seal is achieved between the upper and lower tanks using a sealing ring. The tank body is made of stainless steel, which is highly corrosion-resistant, has a long service life, and is suitable for mixing various alkaline, acidic, and corrosive ultrafine powder media. Its excellent sealing performance also makes it suitable for mixing liquid media and liquid-solid media. Low-speed lower impeller. Located at the bottom of the mixing tank, the impeller at the bottom, agitates the material near the blades of the low-speed impeller, and mixes the material around the tank wall with the material agitated and diffused by the upper and middle impellers. The large circumference of the low-speed impeller improves the tumbling effect of the material, accelerates the suspension, refinement, and diffusion of the material, and increases the material contact area, which is beneficial for efficient mixing of different materials. The guide tube is located in the center of the tank and rotates together with the upper and middle impellers. It can greatly accelerate the mixing process of ultrafine powders that are difficult to mix and are suspended at the top, improving the mixing efficiency. It is especially effective for mixing light, insoluble materials. A considerable portion of the ultrafine powders agitated at high speed are suspended at the top of the tank and do not participate in the mixing, which seriously affects the mixing efficiency. The scraper blades can return the material suspended at the top to the material mixing flow, improving mixing efficiency and uniformity. The mixing tank lid uses a rotating mechanism and a crank-connecting rod mechanism to realize the rotation, opening, and closing of the mixing tank lid. The structure is simple, reduces parts, and lowers later maintenance costs. The cylinder air source comes from the air storage tank, ensuring a stable air supply. The pipeline pressure monitoring pressure switch ensures that an alarm signal is issued when the pipeline pressure exceeds the set range. Silencers are installed at the exhaust ports of each solenoid valve in the air circuit to ensure the personal safety of employees. A crank-parallel four-bar linkage mechanism is used to open and close the material box lid. The drive uses a fast-acting cylinder as the power source to ensure that the mixed material is discharged into the material box safely and reliably.

Claims

1. A high-efficiency mixing and stirring device for lightweight and ultrafine powders, characterized in that, The system includes a mixing tank, a stirring device 1, a stirring device 2, a guide cylinder, a discharge device, and a hopper. The guide cylinder, stirring device 1, and stirring device 2 are located in the lower part of the mixing tank. An outer shaft and an inner shaft located within the outer shaft are vertically rotatably mounted on the guide cylinder. The outer and inner shafts pass through the bottom of the mixing tank. Stirring device 1 is fixedly connected to the inner shaft at the lower end of the guide cylinder, and stirring device 2 is fixedly connected to the outer shaft of the guide cylinder. Stirring device 2 is installed at the lower end of stirring device 1. The lower side of the mixing tank is connected to the discharge device, and the other end of the discharge device is connected to the hopper. Stirring device 1 is driven by an outer shaft drive to rotate and agitate the material, and stirring device 2 is driven by an inner shaft drive to rotate and agitate the material. The mixing tank, stirring device 1, stirring device 2, guide cylinder, and the outer and inner shafts of the guide cylinder are all located on the same vertical central axis.

2. The high-efficiency lightweight and ultrafine powder mixing and stirring device according to claim 1, characterized in that, The stirring device includes an upper impeller and a middle impeller, both of which are fixedly connected to the inner shaft of the guide tube. The middle impeller is located at the lower end of the upper impeller. The inner shaft drive device includes a variable frequency motor, which is located on one side of the mixing tank. The variable frequency motor is connected to the drive pulley of the upper impeller, and the lower end of the inner shaft is connected to the high-speed pulley of the inner shaft. A belt is installed between the drive pulley of the upper impeller and the high-speed pulley of the inner shaft. The variable frequency motor is used to drive the upper impeller and the middle impeller to rotate and stir the material. Both the upper impeller and the middle impeller are equipped with blades.

3. The high-efficiency lightweight and ultrafine powder mixing and stirring device according to claim 1, characterized in that, The second stirring device includes a low-speed lower impeller, and the outer shaft drive device includes a second variable frequency motor. The second variable frequency motor is located on one side of the mixing tank and is connected to the driving pulley of the low-speed lower impeller. The lower end of the outer shaft is connected to the low-speed pulley of the outer shaft. A second belt is installed between the driving pulley of the low-speed lower impeller and the low-speed pulley of the outer shaft. The second variable frequency motor is used to drive the low-speed lower impeller to rotate and stir the material. The low-speed lower impeller is equipped with blades.

4. The high-efficiency lightweight and ultrafine powder mixing and stirring device according to claim 1, characterized in that, It also includes a scraping device. The upper tank of the mixing tank is equipped with a scraping device, and the tank cover of the mixing tank is equipped with a scraping drive device. The main shaft of the scraping drive device is connected to the scraping device, and the scraping device is driven to rotate by the scraping drive device. The scraping drive device is a variable frequency motor, and the scraping device is a scraping plate with blades evenly arranged on the scraping plate.

5. The high-efficiency lightweight and ultrafine powder mixing and stirring device according to claim 1, characterized in that, The mixing tank includes an upper tank and a lower tank. The upper tank is smaller and the lower tank is larger. The upper tank and the lower tank are sealed with a sealing ring.

6. The high-efficiency lightweight and ultrafine powder mixing and stirring device according to claim 1, characterized in that, The mixing tank lid includes a rotating mechanism and a crank-connecting rod mechanism. The rotating mechanism includes a drive shaft, ball bearings, bearing seats, end caps, bases, handles, and base fixing plates. Ball bearings are installed inside the bearing seats. The drive shaft is connected to the bearing seats through the ball bearings. The mixing tank lid is fixedly connected to the bearing seats. The bearing seats rotate together with the mixing tank lid. The end caps are fixedly connected to the bearing seats through bolts. The bases are fixedly connected to the base fixing plates through bolts. The vertical height of the drive shaft is adjusted by the handle. The crank-connecting rod mechanism includes a crank-connecting rod, a spherical bearing, a door-opening drive cylinder, a cylinder base, a bearing housing, a bearing, an end cap, and a rotating shaft. The crank-connecting rod connects the door-opening drive cylinder to the mixing tank lid. The cylinder rod of the door-opening drive cylinder is connected to the crank-connecting rod via a spherical bearing. The cylinder body of the door-opening drive cylinder is connected to the cylinder base via a spherical bearing. The rotating shaft is hinged to the crank-connecting rod via a spherical bearing to support the opening and closing of the lid. The end cap is fixed to the rotating shaft with bolts. The bearing is installed between the bearing housing and the rotating shaft. The door-opening drive cylinder drives the crank-connecting rod to open and close the mixing tank lid around the spherical bearing by extending and retracting the cylinder rod.

7. The high-efficiency lightweight and ultrafine powder mixing and stirring device according to claim 1, characterized in that, The discharge device is equipped with a discharge valve, which includes a cylinder body, a cylinder rod, and a pusher. The cylinder body is fixed on the discharge valve housing. The cylinder rod is used to drive the pusher to extend and retract. The bottom of the pusher rests against the mixing tank. The mixture in the mixing tank is not discharged. When the pusher retracts, the mixture in the mixing tank can be discharged into the material box through the chute below the pusher.

8. The high-efficiency lightweight and ultrafine powder mixing and stirring device according to claim 1, characterized in that, The mixing tank cover is equipped with a main raw material inlet, a secondary material inlet, a binder inlet, a wash water inlet, a steam dust collection inlet, a dust collection return inlet, an air exhaust filter and dust collection inlet, an additive inlet, and a water inlet, and is connected to the corresponding control valves through pipelines.

9. The high-efficiency lightweight and ultrafine powder mixing and stirring device according to claim 1, characterized in that, A cylinder is installed on the hopper cover, which drives a parallel four-bar linkage to open or close the hopper door.

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