Efficient lightweight and superfine powder mixing and stirring device and method

Abstract

The present application relates to a kind of high-efficiency light and superfine powder mixing and stirring device and method, flow guide tube, stirring device one, stirring device two are arranged in the lower part of tank body in mixing tank, outer shaft and inner shaft in outer shaft are vertically rotatably installed on flow guide tube, outer shaft and inner shaft pass through the bottom of mixing tank, stirring device one is fixedly connected with the inner shaft of the lower end of flow guide tube, stirring device two is fixedly connected with the outer shaft of flow guide tube, stirring device two is installed in the lower end of stirring device one, stirring device one is driven by outer shaft driving device and rotates to stir material movement, stirring device two is driven by inner shaft driving device and rotates to stir material movement.The present application has the advantages that: stirring device one, stirring device two, scraping device, improve the mixing efficiency of light superfine powder material, stirring device one can carry out strong suspension stirring, stirring device one, stirring device two, scraper plate are all driven by variable frequency motor, reduce mixing time, improve mixing efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of material mixing process and control in refractory industry, and particularly relates to a high-efficiency light and superfine powder mixing and stirring device and method. BACKGROUND

[0002] The existing material mixing technology in the refractory industry generally uses ordinary powder mixing and processing equipment, including various mixers and mixers to mix and process the materials to be mixed. With the requirement of long service life and erosion resistance of refractory bricks in the refractory industry, it is difficult for ordinary powder mixed and pressed refractory bricks to meet the requirements of the steel industry for refractory materials. The development of light and superfine powder materials in the refractory industry can solve the requirement of long service life of refractory bricks in the steel industry, but the existing equipment cannot meet the requirements of uniform and efficient mixing of superfine powder materials for producing high-quality refractory bricks.

[0003] In the prior art, patent No. CN211246283U, patent name "mixing and stirring device for refractory material production", points out that the present patent "provides a technical solution: a mixing and stirring device for refractory material production, including mixing tank 1, stirring shaft 2, stirring blade 3, scraper 4, guide plate 5, baffle 6, support plate 7, feeding hole 8, fixed column 9, feeding mechanism 10, storage hopper 11 and gear disc 12, the upper end of the mixing tank 1 is rotatably installed with the stirring shaft 2, and the outer side of the stirring shaft 2 is welded with the stirring blade 3, and the bottom end of the stirring shaft 2 is integrally provided with the scraper 4, the left side surface of the mixing tank 1 is provided with the guide plate 5 at the lower end, and the inside of the guide plate 5 is provided with the baffle 6, the support plate 7 is fixed on the side wall of the mixing tank 1 by welding, and the upper surface of the mixing tank 1 is provided with the feeding hole 8 at equal angles, and the outer side of the feeding hole 8 is provided with the fixed column 9 fixed on the mixing tank 1, the outer side of the fixed column 9 is provided with the feeding mechanism 10 through the bearing, and the outer side of the feeding mechanism 10 is provided with the gear disc 12, the storage hopper 11 is located above the feeding mechanism 10, the feeding mechanism 10 includes a feeding box 1001, a charging cavity 1002, a rubber pad 1003 and a sealing plate 1004, the middle part of the feeding box 1001 is reserved with the charging cavity 1002, the upper and lower surfaces of the feeding box 1001 are both pasted with the rubber pad 1003, and the outer side surface of the rubber pad 1003 is pasted with the sealing plate 1004", the mixing equipment of the present patent has only one stirring blade driven by a motor, and has no feeding port for additives, water and other auxiliary materials, and cannot perform complex mixing of multiple materials and additives. The mixing efficiency of light and superfine powder materials is low. SUMMARY

[0004] The purpose of the present application is to provide a high-efficiency light and superfine powder mixing and stirring device and method, which improves the mixing efficiency of light and superfine powder materials, performs strong suspension stirring on the mixed materials, and improves the dispersibility and uniformity.

[0005] To achieve the above object, the present application is realized by the following technical solutions:

[0006] A high-efficiency light and superfine powder mixing and stirring device, comprising a mixing tank, a stirring device one, a stirring device two, a flow guide cylinder, a discharge device, and a material box, the flow guide cylinder, the stirring device one, and the stirring device two are arranged in the lower tank body of the mixing tank, the flow guide cylinder is vertically rotatably provided with an outer shaft and an inner shaft located in the outer shaft, the outer shaft and the inner shaft penetrate through the bottom of the mixing tank, the stirring device one is fixedly connected with the inner shaft at the lower end of the flow guide cylinder, the stirring device two is fixedly connected with the outer shaft of the flow guide cylinder, the stirring device two is installed at the lower end of the stirring device one, the lower end of the side of the mixing tank is communicated with the discharge device, the other end of the discharge device is communicated with the material box, the stirring device one is driven to rotate and stir the material by the outer shaft driving device, the stirring device two is driven to rotate and stir the material by the inner shaft driving device, the mixing tank, the stirring device one, the stirring device two, the flow guide cylinder, the outer shaft, and the inner shaft of the flow guide cylinder are located on the same vertical central axis.

[0007] The stirring device one comprises an upper impeller and a middle impeller, both of which are fixedly connected with the inner shaft of the flow guide cylinder, the middle impeller is arranged at the lower end of the upper impeller, the inner shaft driving device comprises a variable frequency motor one, which is arranged on one side of the mixing tank, the variable frequency motor one is connected with the upper impeller driving pulley, the lower end of the inner shaft is connected with the inner shaft high-speed pulley, a belt one is installed between the upper impeller driving pulley and the inner shaft high-speed pulley, and the variable frequency motor one 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 provided with paddles.

[0008] The stirring device two comprises a low-speed lower impeller, the outer shaft driving device comprises a variable frequency motor two, which is arranged on one side of the mixing tank, the variable frequency motor two is connected with the low-speed lower impeller stirring driving pulley, the lower end of the outer shaft is connected with the outer shaft low-speed pulley, a belt two is installed between the low-speed lower impeller stirring driving pulley and the outer shaft low-speed pulley, and the variable frequency motor two is used to drive the low-speed lower impeller to rotate and stir the material; the low-speed lower impeller is provided with paddles.

[0009] It also comprises a material scraping device, the material scraping device is arranged in the upper tank body of the mixing tank, a material scraping driving device is arranged on the tank cover of the mixing tank, the main shaft of the material scraping driving device is connected with the material scraping device, and the material scraping device is driven to rotate by the material scraping driving device; the material scraping driving device is a variable frequency motor three, the material scraping device is a material scraping plate, and paddles are uniformly arranged on the material scraping 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 the upper tank body and the lower tank body are sealed by a sealing ring.

[0011] The mixed 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, the ball bearing is arranged in the bearing seat, the transmission shaft is connected with the bearing seat through the ball bearing, the mixed tank cover is fixedly connected with the bearing seat, the bearing seat rotates together with the mixed tank cover, the end cover is fixedly connected with the bearing seat through bolts, and the base is fixedly connected with the base fixing plate through bolts; the transmission shaft is adjusted in height in the vertical direction through the handle;

[0012] The crank connecting rod mechanism comprises a crank connecting rod, a joint 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 for connecting the door opening driving cylinder and the mixed tank cover, the cylinder rod of the door opening driving cylinder is connected with the crank connecting rod through the joint bearing, the cylinder body of the driving cylinder is connected with the cylinder base through the joint bearing, the rotating shaft is hinged with the crank connecting rod through the joint bearing, and is used for supporting the opening and closing of the upper cover; the end cover is fixed on the rotating shaft through 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 mixed tank cover around the joint bearing through the extension and retraction of the cylinder rod.

[0013] The discharging device is provided with a discharging valve, the discharging valve comprises a cylinder body, a cylinder rod and a push head, the cylinder body is fixed on the discharging valve shell, the cylinder rod is used for driving the push head to extend and retract, the push head is in contact with the mixed tank, the mixed material in the mixed tank is not discharged, the push head is retracted, and the mixed material in the mixed tank can be discharged into the material box through the chute below the push head.

[0014] The mixed tank cover is provided with a main raw material feeding port, a secondary material feeding port, a binder feeding port, a washing water injection port, a steam dust collection port, a dust collection return port, an air discharge filter and a dust collection port, an additive feeding port and an additive water injection port, and is connected with corresponding control valves through pipelines.

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

[0016] A high-efficiency light-weight and superfine powder mixing and stirring method, the content is as follows:

[0017] The first stirring device adopts high-speed rotation, and the second stirring device adopts low-speed rotation;

[0018] The first stirring device throws and beats the material in the lower tank body to complete high-speed material throwing and form a shearing force, so as to accelerate the suspension, refinement, diffusion and increase of the contact area of the material;

[0019] The second stirring device mixes the material around the cylinder wall with the material thrown and beaten and diffused by the first stirring device, since the diameter of the rotating blade of the second stirring device is greater than that of the first stirring device, the shearing force brought by the second stirring device to the material is greater than that of the first stirring device, so as to accelerate the tumbling of the material;

[0020] The draft tube is arranged at the central part of the tank body and rotates together with the stirring device, the upper impeller and the middle impeller generate downward thrust, the material at the central part of the mixing tank forms a concave material surface flow, the material flow in the draft tube forms flow from top to bottom, the light fine powder material floating on the upper part of the material surface is adsorbed into the draft tube and moves downward, which is used for accelerating the mixing process of the light material;

[0021] The high-speed thrown ultra-fine powder is partially suspended on the top of the upper tank body, the paddle of the material scraping device makes the material suspended on the top and the edge return to the material mixing, which is used for increasing the mixing efficiency and the uniformity of the mixing.

[0022] Compared with the prior art, the beneficial effects of the present application are:

[0023] 1. The stirring device one, the stirring device two and the draft tube are fixedly connected, the stirring device two is installed at the lower end of the stirring device one, the material scraping device is arranged in the upper tank body of the mixing tank, the mixing efficiency of the light ultra-fine powder material is improved, the stirring device one can strongly suspend and stir the material, and the mixing time is reduced under the action of the draft tube, because the stirring device one, the stirring device two and the scraping plate are driven by the variable frequency motor, the variable frequency motor is driven by the corresponding frequency converter, the mixing time is reduced and the mixing efficiency is improved, the stirring device two can make the material tumble, the rotating directions of the stirring device one and the stirring device two are opposite, a strong counterflow is formed, the material can be uniformly mixed in a short time, and the granulation effect can also be achieved under certain conditions;

[0024] 2. The mixing and stirring device is suitable for mixing a plurality of light mutual-soluble medium ultra-fine powders and is also suitable for mixing mutual-insoluble media, so that the dispersibility and uniformity of the mixed media are good, the mixing process can further refine the particles, the mixing is efficient and uniform, the mixing tank and the discharging device are closed, the upper tank body and the lower tank body are sealed by the sealing ring, the whole operation process is environmentally friendly and safe in operation;

[0025] 3. The mixing tank comprises the upper tank body and the lower tank body, the structure form is that the upper tank body is small and the lower tank body is large, the light material is in the suspended state or adhered to the top due to the small density, the small top area of the mixing tank is beneficial to the draft tube at the stirring central shaft to absorb the light material into the draft tube to participate in the mixing, the upper tank body and the lower tank body are reliably sealed by the sealing ring, the tank body is made of stainless steel, has strong corrosion resistance, has a long service life, is suitable for mixing a plurality of alkaline and acidic and corrosive ultra-fine powder mixing media, and the good sealing property is completely suitable for mixing liquid media and solid media.

[0026] 4. The low-speed lower impeller is arranged at the bottom of the mixing tank body, the material near the paddle of the low-speed lower impeller is thrown up, and the material around the tank wall is mixed with the material thrown and diffused by the upper impeller and the middle impeller. The low-speed lower impeller rotates at a low speed, which is energy-saving. The large circumferential radius of the low-speed lower impeller brings a large shear force to the material, improves the rolling effect of the material, accelerates the suspension and refinement of the material, increases the contact area of the material, and is beneficial to the efficient mixing of different materials.

[0027] 5. The flow guide cylinder is arranged at the center of the tank body and rotates with the upper impeller and the middle impeller, which greatly accelerates the mixing process of the ultra-fine powder suspended at the top and improves the mixing efficiency. It is especially effective for mixing between light and insoluble materials.

[0028] 6. A considerable part of the ultra-fine powder thrown at a high speed is suspended at the top of the tank body and does not participate in the mixing of the material, which seriously affects the mixing efficiency. The paddle of the scraping device can make the material suspended at the top return to the material mixing flow, greatly improving the mixing efficiency and uniformity.

[0029] 7. The mixing tank cover adopts a rotating mechanism and a crank connecting rod mechanism to realize the rotation and opening and closing of the mixing tank cover. The structure is simple, the number of parts is reduced, and the maintenance cost is reduced.

[0030] 8. The gas cylinder gas source comes from the gas storage tank, which ensures the stability of the gas source. The pipeline pressure monitoring pressure switch ensures that an alarm signal is sent when the pipeline pressure exceeds the set range. An silencer is arranged at the exhaust port of each electromagnetic valve in the gas circuit to ensure the personal safety of employees.

[0031] 9. A crank parallel four-bar mechanism is used to open and close the tank cover, and a gas cylinder with fast action is used as a power source to ensure that the mixed material is safely and reliably discharged into the tank. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is a layout front view of the high-efficiency light and ultra-fine powder mixing and stirring device.

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

[0034] Figure 3 It is a layout side view of the high-efficiency light and ultra-fine powder mixing and stirring device.

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

[0036] Figure 5 It is a structure diagram of the mixing tank door.

[0037] Figure 6 is a mixed tank cover B-B rotating mechanism diagram.

[0038] Figure 7 is a mixed tank cover C-C crank connecting rod mechanism diagram.

[0039] Figure: 1 - inner shaft (high speed shaft) 2 - outer shaft (low speed shaft) 3 - shaft 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 - seal cover 13 - inner shaft pulley tight nut 14 - bearing box 15 - outer shaft pulley tight nut 16 - lubricating copper pipe 17 - lower impeller 18 - middle impeller 19 - key 20 - upper impeller 21 - key 22 - lower impeller tight nut 23 - impeller spacer ring 24 - upper impeller tight nut 25 - sealing ring 26 - powder scraping 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 draft tube 35 - scraper bearing box 36 - scraper drive motor reducer 37 - scraper 38 - upper impeller drive motor reducer 39 - 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 - joint bearing 49 - door opening drive cylinder 50 - cylinder base 51 - bearing seat 52 - bearing 53 - end cover 54 - rotating shaft 55 - mixed tank cover 101 - mixed tank cover inlet and outlet 102 - mixed tank upper inlet and outlet 103 - mixed material discharge valve device 104 - upper impeller stirring device 105 - mixed tank bottom water outlet 106 - scraping device 107 - lower impeller stirring device 108 - lower impeller stirring driving pulley 109 - standby water adding port 110 - main raw material feeding port 111 - washing water feeding port 112 - dust collection return port 113 - steam dust collection port 114 - binder feeding port 115 - binder feeding port 116 - air discharge filter and dust collection port 117 - secondary raw material feeding port DETAILED DESCRIPTION

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

[0041] The following examples are implemented on the premise of the technical solution of the present application, and detailed implementation methods and specific operation processes are given, but the protection scope of the present application 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 Figures 1-4 A new type of high-efficiency light and superfine powder mixing and stirring device, comprising a mixing tank body (including a lower tank body 32, an upper tank body 33), an upper high-speed stirring device, a lower impeller low-speed stirring device, a screw or propeller guide vane 34, a scraping device, a mixed material discharge valve device, a pneumatic system, a material box cover opening and closing door device, the mixing tank body is a split trapezoidal arc tank body, which adopts a split trapezoidal structure (the volume in the tank is about 2m 3 ) composed of a lower tank body 32 and an upper tank body 33, an upper small and lower large circular arc structure, which is beneficial to the mixing of light materials, the combination part of the lower tank body 32 and the upper tank body 33 adopts a pressurized sealing ring and a stop opening structure for reliable sealing, the mixing tank body top is provided with a scraping device, the scraping device comprises a scraping plate driving motor reducer 36, a scraping plate bearing and a scraping plate 37 connected in sequence, the scraping plate bearing is arranged in the scraping plate bearing box 35, the bottom of the mixing tank body is provided with a high-speed stirring impeller, a screw guide device 34 and a low-speed stirring impeller 17, the high-speed stirring impeller comprises 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, and is suitable for mixing of various alkaline, acidic and corrosive superfine powder mixing media, the upper tank body and the lower tank body are sealed by a sealing ring, which is completely suitable for mixing of liquid media and solid media.

[0044] The high-speed stirring impeller is the main stirring and mixing driving part of the material mixing device, which is arranged at the bottom of the lower tank body 32 to throw and beat the material near the upper impeller 20 and the middle impeller 18 at the bottom to complete high-speed material throwing, form shear force, accelerate material suspension, fine and diffusion, increase material contact area, and facilitate mixing of different materials; the low-speed stirring impeller 17 is arranged at the bottom of the tank body to make the material roll and mix 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 low, the circumferential radius is large, so the shear force brought to the material is also large, which makes the material roll well; the screw (or propeller) guide cylinder 34 is arranged at the center of the tank body and rotates with the high-speed stirring impeller, the high-speed rotating propeller blade 34 in the screw (or propeller) guide cylinder generates downward thrust, which makes the material at the center of the mixing tank form a concave material surface flow, and the material flow in the guide cylinder flows from top to bottom, accelerates the light fine powder material floating on the upper part of the material surface to be adsorbed into the guide cylinder and move downward, accelerates the light material mixing process, and improves the mixing efficiency; the scraping device at the upper part of the mixing tank can make a considerable part of the superfine powder thrown and beaten by the scraping plate driving frequency conversion motor reducer 36 36 suspended at the top of the upper tank body 33, which does not participate in material mixing, seriously affecting the mixing efficiency, the upper scraping device paddle 37 can make the material suspended at the top and edge return to the material mixing, improving the mixing efficiency and uniformity.

[0045] The upper impeller 20 and the middle impeller 18 are each uniformly distributed with 8 paddle blades in 360° circumference, the upper impeller 20 is driven by the upper impeller drive variable frequency motor reducer 38 to drive the upper impeller driving pulley 39, the inner shaft high-speed pulley 6, the inner shaft 1, the middle impeller 18 and the upper impeller 20 to rotate and stir the material.

[0046] The screw or propeller type draft tube 34 is installed on the upper impeller 20 and is composed of a draft tube and a helical (or propeller) paddle, which is selected according to the material and the mixing medium.

[0047] The low-speed lower impeller 17 is uniformly distributed with 3 anchor-type paddle blades in 360° circumference, which is driven by the lower impeller drive variable frequency motor reducer to drive the lower impeller driving pulley, the outer shaft low-speed pulley 7, the outer shaft 2 and the lower impeller 17 (three 360° circumferentially distributed paddle blades) to rotate and stir the bottom material.

[0048] See Figure 5 、 Figure 6 The mixing tank upper cover rotating device is fixed on the lower tank body through the lower base fixing plate 46 and the base 44, the shaft seat 42 is fixed on 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 vertical position of the rotating shaft 40. The mixing tank upper cover rotating device comprises a rotating mechanism and a crank connecting rod mechanism, the rotating mechanism and the crank connecting rod mechanism are arranged on the mixing tank body, the rotating mechanism comprises a transmission shaft 40, a ball bearing 41, a bearing seat 42, an end cover 43, a base 44, a handle 45, a base fixing plate 46, the ball bearing 41 is arranged in the bearing seat 42, the transmission shaft 40 is connected with the bearing seat 42 through the ball bearing 41, the mixing tank cover is fixedly connected with the bearing seat 42, the bearing seat 42 rotates together with the mixing tank cover, the end cover 43 is fixedly connected with the bearing seat 42 through bolts, the base 44 is fixedly connected with the base fixing plate 46 through bolts, and the transmission shaft 40 adjusts the vertical height through the handle 45;

[0049] See Figure 5 、 Figure 7, the mixing machine door shaft seat is driven by the opening door driving cylinder 49, is fixedly connected with the mixing tank cover through the crank connecting rod 47, the middle part of the crank connecting rod 47 is connected with the bearing seat 51 and the rotating shaft 54 through the joint bearing 48, and the mixing tank cover is opened and closed; the bearing 52 supports 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 the crank connecting rod 47, the joint bearing 48, the opening door driving cylinder 49, the cylinder base 50, the bearing seat 51, the bearing 52, the end cover 53 and the rotating shaft 54; the crank connecting rod 47 is used for connecting the opening door driving cylinder 49 and the mixing tank cover; the cylinder rod of the opening door driving cylinder 49 is connected with the crank connecting rod 47 through the joint bearing; the cylinder body of the driving cylinder 49 is connected with the cylinder base 50 through the joint bearing; the swing allowance is relatively large; the rotating shaft 54 is hinged with the crank connecting rod 47 through the joint bearing 48, and is used for supporting the opening and closing of the upper cover; the end cover 53 is fixed on the rotating shaft 54 through bolts; and the bearing 52 is installed between the bearing seat 51 and the rotating shaft 54. The opening door driving cylinder 49 drives the crank connecting rod 47 to open and close the mixing tank cover around the joint bearing 48 through the extension and retraction of the cylinder rod.

[0050] See Figure 2 The tank cover device is provided with a main raw material feeding port, a secondary raw material feeding port, a binder feeding port, a washing water injection port, an additional water standby interface, an air discharge filter and a dust collecting port, a steam dust collecting port, a dust collecting return port, a mixing tank cover inlet and outlet water pipe, a mixing tank upper inlet and outlet water port, a mixing tank bottom water discharge pipe and an inspection door. Each feeding port is provided with an opening and closing limit switch. Since the mixing tank has a unique structure, the ports are connected with the outside through soft connections.

[0051] The material box cover opening and closing door device adopts a crank parallel four-bar linkage mechanism, is used for opening and closing the material box cover, adopts a quick-acting cylinder as a crank power source, adopts a limit switch to collect the material box door opening and closing position signal, and ensures that the mixed material is discharged into the material box.

[0052] The mixing material discharge valve device adopts a reciprocating movement mode driven by a cylinder, is provided with a reciprocating pushing material limit switch and a vibrating discharge device, ensures the reliability of the discharge and improves the discharge efficiency.

[0053] The discharge device is provided with a discharge valve, the discharge valve comprises a cylinder body, a cylinder rod one and a push head, the cylinder body is fixed on the discharge valve shell, the cylinder rod one is used for driving the push head to stretch and retract, the push head is in contact with the mixing tank, the mixed material in the mixing tank is not discharged, the push head is retracted, the mixed material in the mixing tank can be discharged into the material box through the chute below the push head, the push head is driven by a cylinder to realize the reciprocating movement mode discharge, ensures the reliability of the discharge and improves the discharge efficiency.

[0054] A high-efficiency light and superfine powder mixing and stirring method, the content is as follows:

[0055] The first stirring device rotates at high speed and the second stirring device rotates at low speed;

[0056] The first stirring device throws the material in the lower tank to the top to complete high-speed throwing and form shearing force, which is used to accelerate the suspension and refinement of the material, increase the contact area of the material, and increase the contact area of the material.

[0057] The second stirring device mixes the material around the cylinder wall with the material thrown and diffused by the first stirring device. Since the diameter of the rotating blade of the second stirring device is larger than that of the first stirring device, the shearing force brought by the second stirring device to the material is greater than that of the first stirring device, which is used to accelerate the rolling of the material.

[0058] The flow guide cylinder is arranged at the center of the tank and rotates with the first stirring device. The upper impeller and the middle impeller generate downward thrust to form a concave material surface flow in the center of the mixing tank, so that the material flow in the flow guide cylinder flows from top to bottom, and the light fine powder material floating on the upper part of the material surface is adsorbed into the flow guide cylinder and moves downward, which is used to accelerate the mixing process of light material.

[0059] The part of the ultra-fine powder thrown at high speed is suspended at the top of the upper tank, and the paddle of the scraping device makes the material suspended at the top and the edge return to the material mixing, which is used to increase the mixing efficiency and uniformity.

[0060] The stirring device one and the stirring device two are fixedly connected with the flow guide cylinder, the stirring device two is installed at the lower end of the stirring device one, the scraping device is arranged in the upper tank body of the mixing tank, the mixing efficiency of the light super fine powder material is improved, the stirring device one can perform strong suspension stirring on the material, and the mixing time is reduced under the action of the flow guide cylinder, because the stirring device one, the stirring device two and the scraping plate are all driven by the frequency conversion motor, the frequency conversion motor is driven by the corresponding frequency converter, the mixing time is reduced and the mixing efficiency is improved, the stirring device two can make the material tumble, the rotating directions of the stirring device one and the stirring device two are opposite, a strong countercurrent is formed, the material can be uniformly mixed in a short time, and the granulation effect can also be achieved under certain conditions; the mixing stirring device is suitable for mixing of various light mutual solubility medium super fine powder, and is also suitable for mixing between mutual insoluble medium, the dispersion and uniformity of the mixed medium are good, the mixing process can further refine the particles, the mixing is efficient and uniform; the mixing tank and the discharging device are closed, the upper tank body and the lower tank body are sealed by the sealing ring, the whole operation process is environmentally friendly and safe in operation; the mixing tank comprises the upper tank body and the lower tank body, the structure of the upper tank body being small and the lower tank body being large, the light material is concentrated at the top in a suspended state or adhered to the top due to the small density, the small area of the top of the mixing tank is beneficial to the flow guide cylinder at the stirring center shaft to suck the material into the flow guide cylinder to participate in the mixing, the upper tank body and the lower tank body are reliably sealed by the sealing ring, the tank body is made of stainless steel, has strong corrosion resistance, long service life, and is suitable for mixing of various alkaline and acidic and corrosive super fine powder mixing media, the good sealing property is also completely suitable for mixing of liquid medium, and the liquid and solid medium are mixed; the low-speed lower impeller is arranged at the bottom of the tank body in the mixing tank, the material near the paddle of the low-speed lower impeller is thrown and beaten, and the material around the tank wall of the mixing tank is mixed with the material thrown and diffused by the upper impeller and the middle impeller, the low-speed lower impeller rotates at a low speed, is energy-saving, has a large circumferential radius, has great shearing force on the material, improves the tumbling effect of the material, accelerates the suspension, refinement, diffusion and expansion of the material, increases the contact area of the material, and is beneficial to efficient mixing of different materials; the flow guide cylinder is arranged at the center of the tank body and rotates together with the upper impeller and the middle impeller, can greatly accelerate the mixing process of the super fine powder material suspended at the top and improve the mixing efficiency, and is particularly effective for mixing between light insoluble material media; a considerable part of the super fine powder material thrown and beaten at a high speed is suspended at the top of the tank body and does not participate in the mixing of the material, seriously affecting the mixing efficiency, the paddle of the scraping device can make the material suspended at the top return to the material mixing flow, greatly improving the mixing efficiency and uniformity; the tank cover of the mixing tank adopts a rotating mechanism and a crank connecting rod mechanism, realizes the rotation of the tank cover of the mixing tank and the opening and closing actions, has a simple structure, reduces parts, and reduces the maintenance cost in the later period.The air cylinder air source is from the air storage tank, which ensures the stability of the air source. The pipeline pressure monitoring pressure switch is arranged to ensure that the pipeline pressure exceeds the set range and sends an alarm signal. An silencer is arranged at the exhaust port of each electromagnetic valve in the air circuit to ensure the personal safety of employees. A crank parallel four-bar linkage mechanism is adopted to open and close the material box cover. The driving adopts a fast-acting air cylinder as a power source to ensure that the mixed material is safely and reliably discharged into the material box.

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 shaft and the inner shaft 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. 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. The aforementioned device enables a highly efficient method for mixing and stirring lightweight and ultrafine powders, as detailed below: Stirring device one uses high-speed rotation, while stirring device two uses low-speed rotation; 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. 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. 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. 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.

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, 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.

5. 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.

6. 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.

7. 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.

8. 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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