Efficient light and superfine powder mixing and stirring device and method

Abstract

The invention relates to an efficient light and superfine powder mixing and stirring device and method.The efficient light and superfine powder mixing and stirring device is characterized in that a guide cylinder, a first stirring device and a second stirring device are arranged in a lower tank body of a mixing tank, an outer shaft and an inner shaft located in the outer shaft are vertically and rotationally installed 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 first stirring device can strongly suspend and stir the materials, 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] The invention relates to the field of material mixing process and control technology in the refractory industry, and in particular to a high-efficiency, lightweight and ultra-fine powder mixing and stirring device and method. Background Art

[0002] The existing material mixing technology in the refractory industry generally uses ordinary powder mixing and processing equipment, including various stirrers and mixers to mix and process the materials that need to be mixed. As the refractory industry requires refractory bricks to have a long life and be resistant to erosion, refractory bricks formed by pressing and molding ordinary powders after mixing are difficult to meet the requirements of the steel industry for refractory materials. The successful development of lightweight and ultrafine powder materials in the refractory industry can solve the steel industry's requirements for long-life refractory bricks, but the existing equipment is difficult to meet the requirements for uniform and efficient mixing of ultrafine powder materials used to produce high-quality refractory bricks.

[0003] In the prior art, the patent announcement number is CN211246283U, and the patent name is "A mixing and stirring device for the production of refractory materials". It points out that this patent "provides a technical solution: a mixing and stirring device for the production of refractory materials, including a mixing tank 1, a stirring shaft 2, a stirring blade 3, a scraper 4, a guide 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 installed in the middle of the upper end of the mixing tank 1, and the stirring blade 3 is welded and fixed on the outer side of the stirring shaft 2, and the scraper 4 is integrally arranged at the bottom end of the stirring shaft 2. The lower end of the left surface of the mixing tank 1 is provided with a guide plate 5, and the inside of the guide plate 5 is provided with a baffle 6. 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 angularly spaced. A feeding hole 8 is provided, and a fixed column 9 fixed on the mixing tank 1 is arranged on the outside of the feeding hole 8, a feeding mechanism 10 is installed on the outside of the fixed column 9 through a bearing, and a toothed disc 12 is arranged on the outside of the feeding mechanism 10, and a storage hopper 11 is located above the feeding mechanism 10, and the feeding mechanism 10 includes a feeding box 1001, a charging cavity 1002, a rubber pad 1003 and a closed plate 1004, a charging cavity 1002 is reserved in the middle of the feeding box 1001, and the upper and lower surfaces of the feeding box 1001 are both pasted and fixed with rubber pads 1003, and the outer surface of the rubber pad 1003 is pasted and fixed with a closed plate 1004". The patented mixing equipment has only one stirring blade driven by a motor, and there is no inlet for various auxiliary materials such as additives and water, so it cannot carry out 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 the present invention is to provide an efficient light and ultrafine powder mixing and stirring device and method, which improves the mixing efficiency of light ultrafine powder materials, strongly suspends and stirs the mixture, and improves dispersibility and uniformity.

[0005] To achieve the above object, the present invention is implemented through the following technical solutions:

[0006] A high-efficiency, lightweight and ultra-fine powder mixing and stirring device comprises a mixing tank, a stirring device 1, a stirring device 2, a guide tube, a discharging device and a material box. The guide tube, the stirring device 1 and the stirring device 2 are arranged in the lower tank body of the mixing tank. An outer shaft and an inner shaft located in the outer shaft are vertically rotatably mounted on the guide tube. The outer shaft and the inner shaft pass through the bottom of the mixing tank. The stirring device 1 is fixedly connected to the inner shaft at the lower end of the guide tube. The stirring device 2 is fixedly connected to the outer shaft of the guide tube. The stirring device 2 is installed at the lower end of the stirring device 1. The lower end of the side of the mixing tank is connected to the discharging device, and the other end of the discharging device is connected to the material box. The stirring device 1 is driven by an outer shaft driving device to rotate and stir the material, and the stirring device 2 is driven by an inner shaft driving device to rotate and stir the material. The mixing tank, the stirring device 1, the stirring device 2, the guide tube, and the outer shaft and the inner shaft of the guide tube are on the same vertical central axis.

[0007] 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 arranged at the lower end of the upper impeller, and the inner shaft driving device includes a variable frequency motor, which is arranged on one side of the mixing tank, the variable frequency motor is connected to the upper impeller driving pulley, the lower end of the inner shaft is connected to the inner shaft high-speed pulley, a belt is installed between the upper impeller driving pulley and the inner shaft high-speed pulley, and the variable frequency motor is used to drive the upper impeller and the middle impeller to rotate and stir the material to move; the upper impeller and the middle impeller are both provided with paddles.

[0008] The second stirring device includes a low-speed lower impeller, and the external shaft driving device includes a second frequency conversion motor. The second frequency conversion motor is arranged on one side of the mixing tank, the second frequency conversion motor is connected to the low-speed lower impeller stirring active pulley, the lower end of the external shaft is connected to the external shaft low-speed pulley, and a second belt is installed between the low-speed lower impeller stirring active pulley and the external shaft low-speed pulley. The second frequency conversion motor is used to drive the low-speed lower impeller to rotate and stir the material to move; the low-speed lower impeller is provided with a paddle.

[0009] It also includes a scraper device. The scraper device is arranged in the upper tank body of the mixing tank. A scraper driving device is arranged on the tank cover of the mixing tank. The main shaft of the scraper driving device is connected with the scraper device, and the scraper device is driven to rotate by the scraper driving device. The scraper driving device is a variable frequency motor three, and the scraper device is a scraper plate, and paddles are evenly arranged on the scraper plate.

[0010] The mixing tank comprises an upper tank body and a lower tank body, the upper tank body is small, the lower tank body is large, and a sealing ring is used to seal the upper tank body and the lower tank body.

[0011] The mixing tank cover includes a rotating mechanism and a crank-connecting rod mechanism. The rotating mechanism includes a transmission shaft, a ball bearing, a bearing seat, an end cover, a base, a handle, and a base fixing plate. A ball bearing is arranged in the bearing seat. The transmission shaft is connected to the bearing seat through the ball bearing. The mixing tank cover is fixedly connected to the bearing seat. The bearing seat rotates with the mixing tank cover. The end cover is fixedly connected to the bearing seat through bolts. The base is fixedly connected to the base fixing plate through bolts. The transmission shaft is adjusted in vertical height through the handle.

[0012] The crank-connecting rod mechanism includes a crank-connecting rod, a spherical bearing, a door-opening driving cylinder, a cylinder base, a bearing seat, a bearing, an end cover and a rotating shaft. The crank-connecting rod is used to connect the door-opening driving cylinder and the mixing tank cover. The cylinder rod of the door-opening driving cylinder is connected to the crank-connecting rod through a spherical bearing, the cylinder body of the driving cylinder is connected to the cylinder base through a spherical bearing, the rotating shaft and the crank-connecting rod are hinged together through a spherical bearing to support the opening and closing of the upper cover. The end cover is fixed to the rotating shaft by bolts, and the bearing is installed between the bearing seat and the rotating shaft; the door-opening driving cylinder drives the crank-connecting rod to open and close the mixing tank cover around the spherical bearing through the extension and retraction of the cylinder rod.

[0013] A discharge valve is arranged in the discharge device, and the discharge valve comprises a cylinder body, a cylinder rod and a pusher head. The cylinder body is fixed on the discharge valve housing, and the cylinder rod is used to drive the pusher head to extend and retract. The bottom of the pusher head rests on the mixing tank, and the mixed material in the mixing tank is not discharged. When the pusher head is retracted, the mixed material in the mixing tank can be discharged into the material box through the chute below the pusher head.

[0014] The cover of the mixing tank is provided with a main raw material input port, a secondary material input port, a binder input port, a washing water injection port, a steam dust collection port, a dust collection return port, an air exhaust filter and a dust collection port, an additive input port, and an additional water injection port, and is connected to the corresponding control valve through a pipeline.

[0015] A cylinder is arranged on the material box cover, and the cylinder is used to drive the parallel four-bar linkage to open or close the material box door.

[0016] A highly efficient light and ultrafine powder mixing method, the contents are as follows:

[0017] The stirring device 1 rotates at a high speed, and the stirring device 2 rotates at a low speed;

[0018] The stirring device throws the material in the lower tank up, completes high-speed material throwing, forms shear force, and is used to accelerate the suspension, refinement, and diffusion of the material, thereby increasing the contact area of ​​the material;

[0019] The stirring device 2 mixes the materials around the cylinder wall with the materials thrown and spread by the stirring device 1. Since the diameter of the rotating blades used in the stirring device 2 is larger than that of the stirring device 1, the shear force brought to the materials by the stirring device 2 is greater than that of the stirring device 1, which is used to accelerate the tumbling of the materials.

[0020] The guide cylinder is set in the center of the tank body and rotates together with the stirring device. The upper impeller and the middle impeller 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 cylinder flows from top to bottom, accelerating the light fine powder floating on the upper surface of the material to be adsorbed into the guide cylinder and move downward, which is used to accelerate the mixing process of light materials;

[0021] The ultra-fine powder thrown up at high speed is partially suspended on the top of the upper tank body, and the paddles of the scraper device make the suspended materials on the top and edge return to the material mix to increase the mixing efficiency and mixing uniformity.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The stirring device 1 and the stirring device 2 are fixedly connected with the guide tube. The stirring device 2 is installed at the lower end of the stirring device 1. A scraper device is arranged in the upper tank body of the mixing tank to improve the mixing efficiency of the light ultrafine powder material. The stirring device 1 can strongly suspend and stir the material, and reduce the mixing time under the action of the guide tube, because the stirring device 1, the stirring device 2 and the scraper plate are all driven by a variable frequency motor, and the variable frequency motor is driven by a corresponding frequency converter, which reduces the mixing time and improves the mixing efficiency. The stirring device 2 can make the material tumble. The rotation direction of the stirring device 1 is opposite to that of the stirring device 2, forming a strong countercurrent, which can make the material evenly mixed in a short time, and can also play a granulation role under certain conditions;

[0024] 2. The mixing and stirring device is suitable for mixing a variety of lightweight mutually compatible meson ultrafine powders, and is also suitable for mixing mutually insoluble mesons, so that the dispersion and uniformity of the mixed media are good. The mixing process can also further refine the particles and mix efficiently and evenly. The mixing tank is sealed with the discharge device, and the upper tank body and the lower tank body are sealed with a sealing ring. The entire operation process is environmentally friendly and safe.

[0025] 3. The mixing tank includes an upper tank body and a lower tank body. The upper tank body is small and the lower tank body is large. Lightweight materials are concentrated in a suspended state or adhere to the top due to their low density. The top area of ​​the mixing tank is small, which is conducive to the guide tube at the stirring center axis to suck them into the guide tube for forced mixing. A sealing ring is used between the upper tank body and the lower tank body to achieve reliable sealing. The stainless steel used in the tank body has strong corrosion resistance and long service life. It is suitable for mixing a variety of alkaline, acidic and corrosive ultrafine powder mixed media. The good sealing performance is also fully suitable for the mixing of liquid media and the mixing of liquid and solid media;

[0026] 4. The low-speed lower impeller is set at the bottom of the mixing tank body, which throws up the materials near the blades of the low-speed lower impeller at the bottom, and mixes the materials around the wall of the mixing tank with the materials thrown and diffused by the upper and middle impellers. The low-speed lower impeller rotates at a lower speed, which is energy-saving. The circumferential radius of the low-speed lower impeller is large, and the shear force it brings to the material is also very large, which improves the tumbling effect of the material, accelerates the suspension, refinement and diffusion of the material, increases the contact area of ​​the material, and is conducive to the efficient mixing of different materials;

[0027] 5. The guide tube is set in the center of the tank body and rotates together with the upper impeller and the middle impeller. It can greatly speed up the mixing process of the ultra-fine powder suspended on the top that is difficult to mix and improve the mixing efficiency. It is especially effective for mixing light insoluble material media;

[0028] 6. A considerable part of the ultra-fine powder thrown up at high speed is suspended on 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 make the suspended material on the top return to the material mixing flow, greatly improving the mixing efficiency and mixing uniformity;

[0029] 7. The mixing tank cover adopts a rotating mechanism and a crank-connecting rod mechanism to realize the rotation, opening and closing of the mixing tank cover. It has a simple structure, reduces parts and reduces the cost of later maintenance.

[0030] 8. The gas source of the cylinder comes from the gas storage tank, which ensures the stability of the gas source. The pipeline pressure monitoring pressure switch is set to ensure that an alarm signal is issued when the pipeline pressure exceeds the set range. Mufflers are installed at the exhaust ports of each solenoid valve in the gas circuit to ensure the personal safety of employees;

[0031] 9. A crank parallel four-bar linkage is used to open and close the material box cover. The drive uses a fast-acting cylinder as the power source to ensure that the mixed materials are discharged into the material box, which is safe and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is the front view of the layout of the high-efficiency, lightweight and ultra-fine powder mixing and stirring device.

[0033] Figure 2 It is a top view of the layout of a high-efficiency, lightweight and ultra-fine powder mixing and stirring device.

[0034] Figure 3 It is a side view of the arrangement of a highly efficient, lightweight and ultrafine powder mixing and stirring device.

[0035] Figure 4 It is a cross-sectional view of a mixing and stirring device.

[0036] Figure 5 This is the structural diagram of the mixing tank door.

[0037] Figure 6 This is a diagram of the BB rotating mechanism of the mixing tank cover.

[0038] Figure 7 This is the CC crank-connecting rod mechanism diagram of the mixing tank cover.

[0039] In the figure: 1-inner shaft (high-speed shaft) 2-outer shaft (low-speed shaft) 3-axle box 4-outer shaft bearing upper end cover 5-outer shaft bearing lower end cover 6-inner shaft high-speed pulley 7-outer shaft low-speed pulley 8-shaft ring and seal 9-sleeve 10-inner shaft bearing lower end cover 11-inner shaft bearing box 12-sealing cover 13-inner shaft pulley fixing nut 14-bearing box 15-outer shaft pulley fixing nut 16-lubricating copper tube 17-lower impeller 18-middle impeller 19 -key 20-upper impeller 21-key 22-lower impeller fixing nut 23-impeller spacer 24-upper impeller fixing nut 25-sealing ring 26 scraper plate 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 plate bearing box 36 scraper plate drive motor reducer 37-scraper plate 38-upper impeller drive motor reducer 3 9-upper impeller driving pulley 40-transmission shaft 41-ball bearing 42-bearing seat 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 seat 52-bearing 53-end cover 54-rotating shaft 55-mixing tank cover 101-mixing tank cover water inlet and outlet 102-mixing tank upper water inlet and outlet 103-mixed material discharge valve device 104-upper impeller stirring device 105-water outlet at the bottom of the mixing tank 106-scraping device 107-lower impeller stirring device 108-lower impeller stirring active pulley 109-water adding standby interface 110-main raw material input port 111-wash water injection port 112-dust collection return port 113-steam dust collection port 114-adhesive input port 115-adhesive input port 116-air discharge filter and dust collection port 117-auxiliary raw material input port DETAILED DESCRIPTION

[0040] The present invention is described in detail below in conjunction with the accompanying drawings, but it should be noted that the implementation of the present invention is not limited to the following embodiments.

[0041] The following examples are implemented on the premise of the technical solution of the present invention, and provide detailed implementation methods and specific operation processes, but the protection scope of the present invention is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.

[0042] [Example 1]

[0043] See Figure 1-4 A new type of high-efficiency, lightweight and ultra-fine powder mixing and stirring device, including a mixing tank body (including a lower tank body 32 and an upper tank body 33), an upper high-speed stirring device, a lower impeller low-speed stirring device, a screw-type or propeller-type guide tube 34, a scraping device, a mixed material discharge valve device, a pneumatic system, and a material box cover opening and closing device. The mixing tank body is a split trapezoidal arc tank body, adopting a split trapezoidal structure of the lower tank body 32 and the upper tank body 33 (the volume inside the tank is about 2m 3 ), an arc-shaped structure with a small top and a large bottom, which is conducive to the mixing of light materials. The joint between the lower tank body 32 and the upper tank body 33 is reliably sealed by a pressurized sealing ring and a stop structure. A scraper device is installed at the top of the mixing tank body. The scraper device includes a scraper plate drive motor reducer 36, a scraper plate bearing, and a scraper plate 37 connected in sequence. The scraper plate bearing is arranged in a scraper plate bearing box 35. A high-speed stirring impeller, a screw-type guide device 34, and a low-speed stirring impeller 17 are arranged at the bottom of the mixing tank body. 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 has strong corrosion resistance and long service life. It is suitable for mixing a variety of alkaline, acidic and corrosive ultrafine powder mixed media. A sealing ring is used to seal the upper tank body and the lower tank body, which is fully suitable for mixing liquid media and mixing of liquid and solid media.

[0044] The high-speed stirring impeller is the main stirring and mixing driving part of the material mixing device. It is arranged at the bottom of the lower tank body 32, and the materials near the upper impeller 20 and the middle impeller 18 at the bottom are thrown up, completing the high-speed throwing of materials, forming shear force, accelerating the suspension, refinement and diffusion of materials, increasing the contact area of ​​materials, and facilitating the mixing of different materials; the bottom low-speed stirring impeller 17 is arranged at the bottom of the tank body to make the materials roll, and mix the materials around the cylinder wall with the materials thrown and diffused by the high-speed stirring impeller. Although the rotation speed of the low-speed stirring impeller 17 is lower, the circumferential radius is large, so the shear force brought to the materials is also very large, so that the materials have a good rolling effect; the screw (or propeller) type guide tube 34 is arranged at the center of the tank body, and the high-speed stirring impeller The wheels rotate together, and the high-speed rotating propeller blades 34 in the screw (or propeller) type guide tube generate downward thrust, so that the material in the central part of the mixing tank forms a concave material surface flow, and the material flow in the guide tube forms a flow from top to bottom, accelerating the light fine powder floating on the upper surface of the material to be adsorbed into the guide tube and move downward, accelerating the light material mixing process and improving the mixing efficiency; the scraper device on the upper part of the mixing tank, when the scraper plate drives the variable frequency motor reducer 36 to throw up a considerable part of the ultra-fine powder at a high speed, is suspended on the top of the upper tank body 33, and does not participate in the material mixing, which seriously affects the mixing efficiency. The upper scraper device blades 37 can make the suspended materials on the top and edge return to the material mixing, thereby improving the mixing efficiency and the uniformity of the mixing.

[0045] The upper impeller 20 and the middle impeller 18 have 8 blades evenly distributed within a 360° circumference of each impeller. The upper impeller 20 is driven by the upper impeller drive frequency conversion motor reducer 38 to drive the upper impeller active pulley 39, the inner shaft high-speed pulley 6, the inner shaft 1, and the middle impeller 18 and the upper impeller 20 to rotate and stir the material.

[0046] The screw or propeller type guide tube 34 is installed on the upper impeller 20, and is composed of a guide tube and a screw (or propeller) blade. The propeller blade or the propeller type blade is selected according to the conditions of the material and the mixed medium.

[0047] The low-speed lower impeller 17 has three anchor-type paddle blades evenly distributed within a 360° circumference of the impeller. The lower impeller drives the variable frequency motor reducer to drive the lower impeller active pulley, the outer shaft low-speed pulley 7, and the outer shaft 2 to drive the lower impeller 17 (composed of three paddle blades evenly distributed within a 360° circumference) to rotate and stir the bottom material to move.

[0048] See Figure 5 , Figure 6 The mixing tank upper cover rotating device is fixed to the lower tank body through the lower base fixing plate 46 and the base 44, and the shaft seat 42 is fixed to the upper tank body. The upper tank body and the lower tank body can rotate relative to each other, and the adjusting handle 45 can adjust the upper and lower positions of the rotating shaft 40. The mixing tank upper cover rotating device includes a rotating mechanism and a crank connecting rod mechanism, and the rotating mechanism and the crank connecting rod mechanism are arranged on the mixing tank body. The rotating mechanism includes a transmission shaft 40, a ball bearing 41, a bearing seat 42, an end cover 43, a base 44, a handle 45, and a base fixing plate 46. A ball bearing 41 is arranged in the bearing seat 42, and the transmission shaft 40 is connected to the bearing seat 42 through the ball bearing 41. The mixing tank cover is fixedly connected to the bearing seat 42, and the bearing seat 42 rotates with the mixing tank cover. The end cover 43 is fixedly connected to the bearing seat 42 by bolts, and the base 44 is fixedly connected to the base fixing plate 46 by bolts. The transmission shaft 40 is adjusted in height in the vertical direction by the handle 45;

[0049] 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 connecting rod mechanism with the bearing seat 51 and the rotary pump 54 through the joint bearing 48 to open and close the mixing tank cover. The bearing 52 supports the rotation, and the end cover 53 controls the axial movement of the rotating shaft 54 ​​through the bearing 52. The crank-connecting rod mechanism comprises a crank-connecting rod 47, a spherical bearing 48, a door-opening driving cylinder 49, a cylinder base 50, a bearing seat 51, a bearing 52, an end cover 53 and a rotating shaft 54. The crank-connecting rod 47 is used to connect the door-opening driving cylinder 49 and the mixing tank cover. The cylinder rod of the door-opening driving cylinder 49 is connected to the crank-connecting rod 47 through a spherical bearing, and the cylinder body of the driving cylinder 49 is connected to the cylinder base 50 through a spherical bearing. The swing margin is relatively large. The rotating shaft 54 ​​and the crank-connecting rod 47 are hinged together through the spherical bearing 48 to support the opening and closing of the upper cover. The end cover 53 is fixed to the rotating shaft 54 ​​by bolts, and the bearing 52 is installed between the bearing seat 51 and the rotating shaft 54. The door-opening driving cylinder 49 drives the crank-connecting rod 47 to open and close the mixing tank cover around the spherical bearing 48 through the extension and retraction of the cylinder rod.

[0050] See Figure 2 The tank cover device shown in the figure is provided with a main raw material input port, a secondary raw material input port, a binder input port, a washing water injection port, a water addition standby interface, an air exhaust filter and a dust collecting port, a steam dust collecting port, a dust collecting return port, a mixing tank cover water inlet and outlet pipes, a mixing tank upper water inlet and outlet, a mixing tank bottom drain pipe, and an inspection door. The pneumatic valves connected to each input port are required to be equipped with an opening and closing limit switch. Due to the unique structure of this mixing tank, these inlets are connected to the outside world using soft connections.

[0051] The material box cover opening and closing device adopts a crank parallel four-bar linkage mechanism to open and close the material box cover. It uses a fast-acting cylinder as the crank power source and a limit switch to collect the material box door opening and closing position signal to ensure that the mixed material is discharged into the material box.

[0052] The mixed material discharge valve device adopts a reciprocating movement method driven by a cylinder to discharge the material. The discharging device is provided with a reciprocating push limit switch and a vibration discharging device to ensure the reliability of discharging and improve the discharging efficiency.

[0053] A discharge valve is arranged in the discharge device, and the discharge valve comprises a cylinder body, a cylinder rod and a pusher head. The cylinder body is fixed on the discharge valve housing, and the cylinder rod is used to drive the pusher head to extend and retract. The bottom of the pusher head rests on the mixing tank, and the mixed material in the mixing tank is not discharged. When the pusher head is retracted, the mixed material in the mixing tank can be discharged into the material box through the chute under the pusher head. The cylinder is used to push the pusher head to realize reciprocating movement discharging, thereby ensuring the reliability of discharging and improving the discharging efficiency.

[0054] A highly efficient light and ultrafine powder mixing method, the contents are as follows:

[0055] The stirring device 1 rotates at a high speed, and the stirring device 2 rotates at a low speed;

[0056] The stirring device throws the material in the lower tank up, completes high-speed material throwing, forms shear force, and is used to accelerate the suspension, refinement, and diffusion of the material, thereby increasing the contact area of ​​the material;

[0057] The stirring device 2 mixes the materials around the cylinder wall with the materials thrown and spread by the stirring device 1. Since the diameter of the rotating blades used in the stirring device 2 is larger than that of the stirring device 1, the shear force brought to the materials by the stirring device 2 is greater than that of the stirring device 1, which is used to accelerate the tumbling of the materials.

[0058] The guide cylinder is set in the center of the tank body and rotates together with the stirring device. The upper impeller and the middle impeller 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 cylinder flows from top to bottom, accelerating the light fine powder floating on the upper surface of the material to be adsorbed into the guide cylinder and move downward, which is used to accelerate the mixing process of light materials;

[0059] The ultra-fine powder thrown up at high speed is partially suspended on the top of the upper tank body, and the paddles of the scraper device make the suspended materials on the top and edge return to the material mix to increase the mixing efficiency and mixing uniformity.

[0060] The stirring device 1 and the stirring device 2 of the present invention are fixedly connected to the guide cylinder, the stirring device 2 is installed at the lower end of the stirring device 1, and a scraping device is arranged in the upper tank body of the mixing tank, so as to improve the mixing efficiency of the light ultrafine powder material. The stirring device 1 can strongly suspend and stir the material, and reduce the mixing time under the action of the guide cylinder, because the stirring device 1, the stirring device 2, and the scraping plate are all driven by a variable frequency motor, and the variable frequency motor is driven by a corresponding frequency converter, so as to reduce the mixing time and improve the mixing efficiency, and the stirring device 2 can make the material tumble, and the rotation direction of the stirring device 1 is opposite to that of the stirring device 2, so as to form a strong countercurrent, so as to make the material evenly mixed in a short time, and can also play a granulation role under certain conditions. ; The mixing and stirring device is suitable for mixing a variety of lightweight mutually compatible meson ultrafine powders, and is also suitable for mixing mutually insoluble mesons, so that the dispersion and uniformity of the mixed media are good. The mixing process can also further refine the particles and make the mixing efficient and uniform. The mixing tank is sealed with the discharge device, and the upper tank body and the lower tank body are sealed with a sealing ring. The entire operation process is environmentally friendly and safe. The mixing tank includes an upper tank body and a lower tank body, and the upper tank body is small and the lower tank body is large. The lightweight material is concentrated in the top suspended state or adhered to the top due to its low density. The top area of ​​the mixing tank is small, which is conducive to the guide tube at the central axis of the mixing to suck them into the guide tube and force them to participate in the mixing. The upper tank body and the lower tank body are sealed with a sealing ring. It has reliable sealing, and the stainless steel used in the tank body has strong corrosion resistance and long service life. It is suitable for mixing a variety of alkaline, acidic and corrosive ultrafine powder mixed media. The good sealing performance is also fully suitable for mixing liquid media and liquid and solid media. The low-speed lower impeller is set at the bottom of the mixing tank body to toss up the materials near the blades of the low-speed lower impeller at the bottom, and mix the materials around the mixing tank cylinder wall with the materials tossed and diffused by the upper and middle impellers. The low-speed lower impeller rotates at a lower speed, which is energy-saving. The circumferential radius of the low-speed lower impeller is large, and the shear force it brings to the material is also very large, which improves the tumbling effect of the material, accelerates the suspension, refinement and diffusion of the material, increases the contact area of ​​the material, and is conducive to efficient mixing. Different materials; The guide tube is set in the center of the tank body and rotates with the upper impeller and the middle impeller, which can greatly speed up the mixing process of the ultra-fine powder suspended on the top that is difficult to mix and improve the mixing efficiency. It is especially effective for the mixing of light insoluble materials. A considerable part of the ultra-fine powder thrown up at high speed is suspended on the top of the tank body and does not participate in the material mixing, which seriously affects the mixing efficiency. The blades of the scraper device can make the material suspended on the top return to the material mixing flow, greatly improving the mixing efficiency and mixing uniformity. The cover of the mixing tank adopts a rotating mechanism and a crank-connecting rod mechanism to realize the rotation of the cover of the mixing tank and the opening and closing actions. It has a simple structure, reduces parts, and reduces the cost of later maintenance.The cylinder gas source comes from the gas storage tank, which ensures the stability of the gas source. The pipeline pressure monitoring pressure switch is set to ensure that the alarm signal is issued when the pipeline pressure exceeds the set range. Mufflers are set at the exhaust ports of each solenoid valve in the gas circuit to ensure the personal safety of employees. A crank parallel four-bar linkage is used to open and close the material box cover. The drive uses a fast-moving cylinder as the power source to ensure that the mixed material is discharged into the material box safely and reliably. ;

Claims

1. A highly efficient, lightweight and ultra-fine powder mixing and stirring device, characterized in that: It includes a mixing tank, a stirring device 1, a stirring device 2, a guide tube, a discharging device, and a material box. The guide tube, the stirring device 1, and the stirring device 2 are arranged in the lower tank body of the mixing tank. An outer shaft and an inner shaft located in the outer shaft are vertically rotatably installed on the guide tube. The outer shaft and the inner shaft pass through the bottom of the mixing tank. The stirring device 1 is fixedly connected to the inner shaft at the lower end of the guide tube, the stirring device 2 is fixedly connected to the outer shaft of the guide tube, the stirring device 2 is installed at the lower end of the stirring device 1, the lower end of the side of the mixing tank is connected with the discharging device, and the other end of the discharging device is connected with the material box. The stirring device 1 is driven by an outer shaft driving device to rotate and stir the material, and the stirring device 2 is driven by an inner shaft driving device to rotate and stir the material. The mixing tank, the stirring device 1, the stirring device 2, the guide tube, and the outer shaft and the inner shaft of the guide tube are on the same vertical central axis.

2. A highly efficient, lightweight and ultra-fine powder mixing and stirring device according to claim 1, characterized in that: The stirring device comprises an upper impeller and a middle impeller, both of which are fixedly connected to the inner shaft of the guide cylinder, the middle impeller is arranged at the lower end of the upper impeller, and the inner shaft driving device comprises a variable frequency motor, which is arranged on one side of the mixing tank, the variable frequency motor is connected to the upper impeller driving pulley, the lower end of the inner shaft is connected to the inner shaft high-speed pulley, a belt is installed between the upper impeller driving pulley and the inner shaft high-speed pulley, and the variable frequency motor is used to drive the upper impeller and the middle impeller to rotate and stir the material to move; the upper impeller and the middle impeller are both provided with paddles.

3. The high-efficiency, lightweight and ultra-fine powder mixing and stirring device according to claim 1 is characterized in that: The second stirring device includes a low-speed lower impeller, and the external shaft driving device includes a second frequency conversion motor. The second frequency conversion motor is arranged on one side of the mixing tank, and the second frequency conversion motor is connected to the low-speed lower impeller stirring active pulley. The lower end of the external shaft is connected to the external shaft low-speed pulley. A second belt is installed between the low-speed lower impeller stirring active pulley and the external shaft low-speed pulley. The second frequency conversion motor is used to drive the low-speed lower impeller to rotate and stir the material to move; the low-speed lower impeller is provided with a paddle.

4. The high-efficiency, lightweight and ultra-fine powder mixing and stirring device according to claim 1 is characterized in that: It also includes a scraper device. The scraper device is arranged in the upper tank body of the mixing tank. A scraper driving device is arranged on the tank cover of the mixing tank. The main shaft of the scraper driving device is connected with the scraper device, and the scraper device is driven to rotate by the scraper driving device. The scraper driving device is a variable frequency motor three, and the scraper device is a scraper plate, and paddles are evenly arranged on the scraper plate.

5. The high-efficiency, lightweight and ultra-fine powder mixing and stirring device according to claim 1, characterized in that: The mixing tank comprises an upper tank body and a lower tank body, the upper tank body is small, the lower tank body is large, and a sealing ring is used to seal the upper tank body and the lower tank body.

6. The high-efficiency, light-weight and ultra-fine powder mixing and stirring device according to claim 1, characterized in that: The mixing tank cover comprises a rotating mechanism and a crank-connecting rod mechanism, the rotating mechanism comprises a transmission shaft, a ball bearing, a bearing seat, an end cover, a base, a handle, and a base fixing plate, a ball bearing is arranged in the bearing seat, the transmission shaft is connected to the bearing seat through the ball bearing, the mixing tank cover is fixedly connected to the bearing seat, the bearing seat rotates with the mixing tank cover, the end cover is fixedly connected to the bearing seat through bolts, the base is fixedly connected to the base fixing plate through bolts, and the transmission shaft is adjusted in vertical height through the handle; The crank-connecting rod mechanism includes a crank-connecting rod, a spherical bearing, a door-opening driving cylinder, a cylinder base, a bearing seat, a bearing, an end cover and a rotating shaft. The crank-connecting rod is used to connect the door-opening driving cylinder and the mixing tank cover. The cylinder rod of the door-opening driving cylinder is connected to the crank-connecting rod through a spherical bearing. The cylinder body of the door-opening driving cylinder is connected to the cylinder base through a spherical bearing. The rotating shaft and the crank-connecting rod are hinged together through a spherical bearing to support the opening and closing of the upper cover. The end cover is fixed to the rotating shaft by bolts, and the bearing is installed between the bearing seat and the rotating shaft. The door-opening driving cylinder drives the crank-connecting rod to open and close the mixing tank cover around the spherical bearing through the extension and retraction of the cylinder rod.

7. The high-efficiency, lightweight and ultra-fine powder mixing and stirring device according to claim 1, characterized in that: A discharge valve is arranged in the discharge device, and the discharge valve comprises a cylinder body, a cylinder rod 1, and a pusher head. The cylinder body is fixed on the discharge valve housing, and the cylinder rod 1 is used to drive the pusher head to extend and retract. The bottom of the pusher head rests on the mixing tank, and the mixed material in the mixing tank is not discharged. The pusher head is retracted, and the mixed material in the mixing tank can be discharged into the material box through the chute below the pusher head.

8. The high-efficiency, lightweight and ultra-fine powder mixing and stirring device according to claim 1, characterized in that: The mixing tank cover is provided with a main raw material input port, a secondary material input port, a binder input port, a washing water injection port, a steam dust collection port, a dust collection return port, an air exhaust filter and a dust collection port, an additive input port, and an additional water injection port, and is connected to the corresponding control valve through a pipeline.

9. The high-efficiency, lightweight and ultra-fine powder mixing and stirring device according to claim 1, characterized in that: A cylinder is arranged on the material box cover, and the cylinder is used to drive the parallel four-bar linkage mechanism to open or close the material box door.

10. A highly efficient light and ultrafine powder mixing method is realized by the device according to any one of claims 1 to 9, characterized in that: The content is as follows: The stirring device 1 rotates at a high speed, and the stirring device 2 rotates at a low speed; The stirring device throws the material in the lower tank up, completes high-speed material throwing, forms shear force, and is used to accelerate the suspension, refinement, and diffusion of the material, thereby increasing the contact area of ​​the material; The stirring device 2 mixes the materials around the cylinder wall with the materials thrown and spread by the stirring device 1. Since the diameter of the rotating blades used in the stirring device 2 is larger than that of the stirring device 1, the shear force brought to the materials by the stirring device 2 is greater than that of the stirring device 1, which is used to accelerate the tumbling of the materials. The guide cylinder is set in the center of the tank body and rotates together with the stirring device. The upper impeller and the middle impeller 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 cylinder flows from top to bottom, accelerating the light fine powder floating on the upper surface of the material to be adsorbed into the guide cylinder and move downward, which is used to accelerate the mixing process of light materials; The ultra-fine powder thrown up at high speed is partially suspended on the top of the upper tank body, and the paddles of the scraper device make the suspended materials on the top and edge return to the material mix to increase the mixing efficiency and mixing uniformity.

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