ITO powder homogenizing device with stable quality

Abstract

The invention discloses a stable-quality ITO (indium tin oxide) powder homogenizing device, which relates to the technical field of ITO powder processing, and comprises a spray drying tower, an auxiliary tower, an ITO slurry stirring tank, a powder tank and a homogenizing and mixing barrel, a negative pressure fan mechanism is arranged at the top of the auxiliary tower, a vacuum pumping machine is connected between the homogenizing and mixing barrel and the powder tank in a matched mode, and the device further comprises a first vibration screening mechanism, a recycling and grinding mechanism and a material supplementing mechanism. The material supplementing bin is arranged to supplement coarse powder or fine powder to mixed powder entering the homogenizing and mixing barrel, the proportion of the coarse powder to the fine powder in the mixed powder is adjusted in time, in the material supplementing process, the powder is guided into the homogenizing and mixing barrel through the transition barrel, uniform mixing is accelerated through stirring of the stirring shaft, and the uniform mixing effect is improved. And meanwhile, the transition barrel slides in a reciprocating manner, so that the supplemented powder can be conveniently dispersed into the homogenizing and mixing barrel, the uniform mixing effect is improved, the uniform distribution of the powder is ensured, and the quality stability of subsequent I TO powder prepared products is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of ITO powder processing, and in particular to an ITO powder homogenizing device with stable quality. Background Art

[0002] ITO powder is a composite material composed of indium oxide and tin oxide. It has excellent transparency and conductivity and can be used to make ITO targets. ITO targets are mainly used to make liquid crystals, flat panels, plasma displays, touch screens, solar cells, antistatic coatings and other products. ITO powder with stable quality and high quality is a key core material in the field of display panels.

[0003] In the existing preparation of ITO powder, the ITO slurry is first transported to a spray drying device for spray drying, so that the slurry forms countless small droplets and is dispersed, and then dried by hot air to obtain powder. The powder generally contains two specifications of coarse and fine. The two specifications of powder are then sucked into a homogenizing mixing barrel at the same time for mixing, thereby obtaining the finished ITO powder.

[0004] The shortcomings of the existing ITO powder preparation device are: although the existing ITO powder can rely on spray drying to obtain two specifications of powder during the preparation process, and then mix them in a homogenizing mixing barrel, it is only a simple mixing. It is easy to have uneven and unqualified parameters such as loose density of powder during mixing. For example, the ratio of coarse powder and fine powder in the mixed powder does not meet the specifications, which will lead to uneven loose density and poor uniformity of ITO powder in the entire batch. If this ITO powder with poor uniformity is used in the manufacture of electronic display screens, the product quality will be unstable and poor; in addition, in the screening process after the ITO powder is spray-dried, the coarse powder with larger particles produced needs to be extracted and processed by complex means such as chemical reduction, and then undergo a series of processes to be re-made into ITO powder. This process is time-consuming and long, greatly increasing the manufacturing cost, reducing production efficiency, and is not conducive to large-scale industrial production. Summary of the invention

[0005] The purpose of the present invention is to provide an ITO powder homogenizing device with stable quality, so as to solve the technical problem that in the prior art, the ITO powder is simply mixed during the homogenizing mixing process, which easily leads to uneven and unqualified parameters such as loose packed density of the powder, making it inconvenient to handle and resulting in unstable quality.

[0006] The technical problem to be solved by the present invention can be achieved by the following technical solutions:

[0007] A device for homogenizing ITO powder with stable quality, comprising a spray drying tower, a sub-tower, an ITO slurry stirring tank, a powder tank and a homogenizing mixing cylinder; a negative pressure fan mechanism connected to the spray drying tower is arranged on the top of the sub-tower, a vacuum pump is connected between the homogenizing mixing cylinder and the powder tank, and further comprising:

[0008] A first vibrating screening mechanism and a recovery grinding mechanism, wherein the first vibrating screening mechanism is arranged at the bottom of the spray drying tower, one side of the first vibrating screening mechanism is connected to the powder tank, the first vibrating screening mechanism is used to screen the ITO powder discharged from the spray drying tower, and the recovery grinding mechanism is used to grind the coarse powder screened by the first vibrating screening mechanism, and transport the ground coarse powder to the ITO slurry stirring tank;

[0009] The feeding mechanism comprises a feeding bin and a transition feeding mechanism, and the transition feeding mechanism is used to guide the powder in the feeding bin into the homogenizing mixing cylinder.

[0010] As a further solution of the present invention: the first vibrating screening mechanism includes a screening drum, a driving motor and a vibrating screen plate, the screening drum is fixedly arranged at the bottom of the spray drying tower, the vibrating screen plate is obliquely arranged inside the screening drum, and the vibrating screen plate is also slidably connected to the screening drum, the side of the screening drum close to the ITO slurry stirring tank is fixedly connected with an inclined conduit, and the vibrating screen plate and the inclined conduit are cooperated and docked, the bottom of the screening drum is an inclined plate shape, and one side of the bottom of the screening drum is connected to the powder tank, the end of the inclined conduit is connected to a dispersion tank, and the dispersion tank is connected to the recovery and grinding mechanism, the bottom of the vibrating screen plate is fixedly connected with guide rods on both sides, and the guide rods slide through the bottom of the screening drum, a limiting spring is connected between the guide rod and the screening drum, and a lifting linkage mechanism is cooperated and connected between the guide rod and the driving motor.

[0011] As a further solution of the present invention: the lifting linkage mechanism includes a linkage plate and a cam, the linkage plate is fixedly connected to the bottom of the guide rod, the cam is fixedly connected to the main shaft of the drive motor, and the cam is fitted at the bottom of the linkage plate.

[0012] As a further solution of the present invention: the recovery grinding mechanism includes a sand mill, a suction pump for conveying liquid to the sand mill is installed on one side of the bottom of the dispersion tank, and a conveying pump body connected to the ITO slurry stirring tank is fixedly installed on one side of the bottom of the sand mill.

[0013] As a further solution of the present invention: a drying blower and a water mist generator are installed on the side wall of the homogenizing mixing drum, a discharge pipe is fixedly connected to the bottom of the homogenizing mixing drum, and a first solenoid valve is installed on the discharge pipe, a second vibrating screening mechanism is installed at the bottom of the discharge pipe, and the second vibrating screening mechanism has the same structure as the first vibrating screening mechanism, and the dispersion tank of the second vibrating screening mechanism is connected to the sand mill, and a finished product discharge pipe is installed on one side of the bottom of the screening drum of the second vibrating screening mechanism.

[0014] As a further solution of the present invention: the negative pressure fan mechanism includes an exhaust fan, a filter element and a suction pipe, the exhaust fan is installed at the top of the auxiliary tower, and the filter element is installed at the communication position between the exhaust fan and the auxiliary tower, one end of the suction pipe is located inside the spray drying tower, and the other end is connected to the auxiliary tower, a conical baffle cap is fixedly installed on the end of the suction pipe located inside the spray drying tower, and suction holes are circumferentially opened on the suction pipe near the conical baffle cap, and the bottom of the auxiliary tower is connected to the powder tank.

[0015] As a further solution of the present invention: the transition feeding mechanism includes a transition tube and a support rail, a layered bracket is arranged on one side of the auxiliary tower, the feeding bin is arranged on the top of the layered bracket, a second solenoid valve is fixedly installed on the bottom of the feeding bin, a corrugated hose is connected between the second solenoid valve and the top of the transition tube, the corrugated hose connects the second solenoid valve and the transition tube, the transition feeding mechanism also includes a trigger control mechanism, the trigger control mechanism is used to control the switch of the second solenoid valve, the support rail is horizontally fixedly connected to the layered bracket near the top position, the transition tube is slidably connected to the support rail The homogenizing mixing barrel is fixedly arranged on the layered bracket, and a strip-shaped feed port is provided on the top of the homogenizing mixing barrel, and the bottom of the transition barrel is connected with the strip-shaped feed port. The bottom of the transition barrel is also fixedly connected with a closed slide that fits in with the outer wall of the homogenizing mixing barrel, and the closed slide is used to close the strip-shaped feed port. A stirring shaft is rotatably arranged inside the homogenizing mixing barrel, and a telescopic rotating linkage mechanism coaxially arranged with the stirring shaft is arranged on the outside of the homogenizing mixing barrel, the telescopic rotating linkage mechanism cooperates with the main shaft of the driving motor, and a reciprocating sliding mechanism is also cooperated and connected between the stirring shaft and the closed slide.

[0016] As a further solution of the present invention: the reciprocating sliding mechanism includes a first steering bevel gear, a second steering bevel gear, a first linkage rod and a second linkage rod, the first steering bevel gear is rotatably arranged on the outside of the homogenizing mixing barrel, one end of the stirring shaft extends to the outside of the homogenizing mixing barrel, and the second steering bevel gear is coaxially connected to the end of the stirring shaft, and the second steering bevel gear is meshed with the first steering bevel gear, one side of the first steering bevel gear is coaxially fixedly connected with an extension shaft, the first linkage rod is vertically fixedly connected to the end of the extension shaft, the end of the first linkage rod is rotatably connected to the second linkage rod, and the end of the second linkage rod is away from the first linkage rod and is rotatably connected to the closed slide.

[0017] As a further solution of the present invention: the telescopic and rotating linkage mechanism includes a square telescopic rod, a first bevel friction wheel, a second bevel friction wheel and a transmission belt, the square telescopic rod is coaxially fixedly connected to the extended end of the stirring shaft, the first bevel friction wheel is coaxially fixedly connected to the telescopic end of the square telescopic rod, the square telescopic rod is also fixedly connected to a limiting ring, a push-pull ring is arranged between the limiting ring and the first bevel friction wheel, an auxiliary electric telescopic rod is fixedly connected to the top of the layered bracket, the telescopic end of the auxiliary electric telescopic rod is fixedly connected to the push-pull ring, the trigger control mechanism is electrically connected to the auxiliary electric telescopic rod, the second bevel friction wheel is cooperatively arranged on one side of the first bevel friction wheel, and the second bevel friction wheel is rotatably connected to one side of the layered bracket, the main shaft end of the drive motor and the second bevel friction wheel are both coaxially fixedly connected to a transmission wheel, and the two transmission wheels are cooperatively connected by a transmission belt.

[0018] As a further solution of the present invention: the trigger control mechanism includes a main electric telescopic rod, a first switch group and a second switch group, the main electric telescopic rod is fixedly connected to the top of the layered bracket, and the telescopic end of the main electric telescopic rod is provided with a protrusion, the first switch group and the second switch group are distributed on both sides of the protrusion, the first switch group is distributed with a valve opening switch for controlling the opening of the corresponding second solenoid valve, and is also distributed with an extension control switch for controlling the extension of the auxiliary electric telescopic rod, the second switch group is distributed with a valve closing switch for controlling the closing of the corresponding second solenoid valve, and is also distributed with a contraction control switch for controlling the contraction of the auxiliary electric telescopic rod.

[0019] Beneficial effects of the present invention:

[0020] 1. The present invention provides a feeding bin to supplement the mixed powder entering the homogeneous mixing cylinder with coarser powder or finer powder, and timely adjusts the ratio of coarser powder to finer powder in the mixed powder. During the feeding process, the powder in the feeding bin first enters the transition cylinder, is introduced into the homogeneous mixing cylinder by the transition cylinder, and is accelerated by stirring with a stirring shaft. At the same time, the stirring shaft also drives the transition cylinder to slide back and forth through steering bevel gears, linkage rods and other components, so that the supplemented powder is dispersed into the homogeneous mixing cylinder, the mixing effect is improved, and the powder is evenly distributed, so that the difference between different batches of ITO powder is extremely small, which provides reliable raw material guarantee for the large-scale production of downstream products and ensures the quality stability of subsequent ITO powder preparation products.

[0021] 2. The present invention relies on the first vibrating screening mechanism to screen the powder obtained by spray drying. The first vibrating screening mechanism relies on the driving motor to drive the cam to continuously act on the linkage plate, so that the vibrating screen plate vibrates up and down, which promotes the screening effect, makes it convenient to mix the screened large-particle coarse powder with water to form a liquid and recover it to the sand mill for grinding, and finally returns it to the ITO slurry stirring tank again, which is convenient and fast for recycling, improves the recovery efficiency and utilization rate of the coarse powder, and reduces the production cost.

[0022] 3. When the corresponding feeding bin needs to be opened for feeding, the present invention controls the corresponding main electric telescopic rod to extend and run, and the main electric telescopic rod acts on the first switch group, so that the second solenoid valve corresponding to the feeding bin is opened to discharge the material, and at the same time, the main electric telescopic rod drives the first inclined friction wheel to contact the second inclined friction wheel, and the second inclined friction wheel relies on the transmission wheel and the transmission belt to rotate with the driving motor of the first vibrating screening mechanism, so that the power source of the first vibrating transition mechanism can be used to link the first inclined friction wheel to rotate, and the first inclined friction wheel drives the stirring shaft to rotate, so as to facilitate the reciprocating motion of the transition cylinder for feeding, that is, when the second solenoid valve of the feeding bin is opened to start feeding, the transition cylinder and the stirring shaft run automatically, and there is no need to rely solely on the power source to drive, thereby improving the convenience of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below in conjunction with the accompanying drawings.

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 It is a schematic diagram of the overall rear view structure of the present invention;

[0026] Figure 3 It is a schematic diagram of the cross-sectional structure of the spray drying tower in the present invention;

[0027] Figure 4 It is a schematic diagram of the structure of the driving motor, the first bevel friction wheel and the second bevel friction wheel in the present invention;

[0028] Figure 5 It is a schematic structural diagram of the first steering bevel gear, the second steering bevel gear and the first bevel friction wheel in the present invention;

[0029] Figure 6 It is a schematic diagram of the structure of the transition cylinder and the homogenizing mixing cylinder in the present invention;

[0030] Figure 7 yes Figure 6 A schematic diagram of the enlarged structure at A in the middle;

[0031] Figure 8It is a schematic diagram of the state when the first bevel friction wheel and the second bevel friction wheel are butt-jointed together in the present invention.

[0032] In the figure: 1, spray drying tower; 2, sprayer; 3, hot air blower; 4, ITO slurry stirring tank; 5, sand mill; 6, dispersion tank; 7, feeding bin; 8, layered support; 9, screening cylinder; 10, auxiliary tower; 11, powder tank; 12, transition cylinder; 13, homogenizing mixing cylinder; 14, discharge pipe; 15, first vibrating screening mechanism; 16, second vibrating screening mechanism; 17, vacuum extractor; 18, second steering bevel gear; 19, closed slide plate; 20, second linkage rod; 21, first linkage rod; 22, first steering bevel gear; 23, transmission belt; 2 4. Driving motor; 25. Cam; 26. Transmission wheel; 27. Second inclined friction wheel; 28. Support guide rail; 29. ​​Inclined guide tube; 30. Vibrating screen plate; 31. Guide rod; 32. Limit spring; 33. Linkage plate; 34. Suction tube; 35. First inclined friction wheel; 36. Auxiliary electric telescopic rod; 37. Push-pull ring; 38. Limit ring; 39. Main electric telescopic rod; 40. Second solenoid valve; 41. Strip feed port; 42. Stirring shaft; 43. First solenoid valve; 44. First switch group; 45. Second switch group; 46. Square telescopic rod. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] like Figure 1-Figure 8As shown, a device for homogenizing ITO powder with stable quality comprises a spray drying tower 1, a sub-tower 10, an ITO slurry stirring tank 4, a powder tank 11 and a homogenizing mixing cylinder 13; a sprayer 2 is arranged on the top of the spray drying tower 1, and the sprayer 2 can be a high-speed rotating spray element or a fixed spray nozzle, and a circle of atomizing spray holes are distributed on the surface; the ITO slurry stirring tank 4 stores the original slurry for preparing ITO powder, and is equipped with a stirring element for continuous stirring to avoid precipitation; a delivery pump is installed on one side of the bottom of the ITO slurry stirring tank 4, and the ITO slurry stirring tank 4 delivers ITO slurry to the sprayer 2 through the delivery pump, and then the ITO slurry is atomized and sprayed into the inside of the spray drying tower 1 by the sprayer 2; a hot air blower 3 is installed on one side of the spray drying tower 1, and the hot air blower 3 inputs high-temperature gas into the spray drying tower 1 for contacting with the atomized droplets to evaporate and dry them, thereby obtaining ITO powder. TO powder; a negative pressure fan mechanism connected to the spray drying tower 1 is arranged on the top of the auxiliary tower 10, and the negative pressure fan mechanism is used to suck out the evaporated water, and at the same time, the fine powder can be sucked into the auxiliary tower 10; the powder tank 11 is used to store the ITO powder produced by the spray drying tower 1, and a vacuum pump 17 is connected between the homogenizing mixing cylinder 13 and the powder tank 11, and the vacuum pump 17 is used to transport the ITO powder in the powder tank 11 to the homogenizing mixing cylinder 13. A sampling hole is arranged on one side of the bottom of the homogenizing mixing cylinder 13, and the sampling hole is threadedly connected with a sealing plug. After the powder enters the homogenizing mixing cylinder 13, the sampling hole can be opened to take out a part of the ITO powder, and then the moisture content and bulk density of the powder sample are tested by instruments, for example, a high-precision capacitive moisture sensor and a bulk density detector are used to measure the moisture and bulk density respectively, and record them;

[0035] The homogenizing device also includes a first vibrating screening mechanism 15, a recovery grinding mechanism and a feeding mechanism. The first vibrating screening mechanism 15 is arranged at the bottom of the spray drying tower 1. A material guide pipe is provided on one side of the first vibrating screening mechanism 15, and the first vibrating screening mechanism 15 is connected to the powder tank 11 through the material guide pipe. The first vibrating screening mechanism 15 is used to screen the ITO powder discharged from the spray drying tower, and screen out the coarse powder with larger particles so that the coarse powder that meets the specifications can pass. The recovery grinding mechanism is used to grind the coarse powder screened by the first vibrating screening mechanism 15, and transport the ground coarse powder to the ITO slurry stirring tank 4, so as to remix it into slurry, and then spray dry it again, without the need for chemical reduction reaction treatment, thereby reducing the processing time and improving the overall processing and preparation efficiency.

[0036] The feeding mechanism includes a feeding bin 7 and a transition feeding mechanism. Two groups of feeding bins 7 can be provided. Since the ITO powder obtained by drying is a mixture of coarser powder and finer powder, in order to adjust its loose density and ensure that the ratio of coarser powder to finer powder in the ITO powder is qualified, different feeding bins 7 can be used to supplement the corresponding powder to improve the uniformity of the powder, thereby improving the product quality. The transition feeding mechanism is used to guide the powder in the feeding bin 7 into the homogenizing mixing cylinder 13.

[0037] It should be noted that a drying blower and a water mist generator can also be installed at the upper position of the side wall of the homogenizing mixing barrel 13, which is not shown in the specific figure, and the air supply end of the drying blower and the water mist discharge end of the water mist generator are located on the inner wall of the homogenizing mixing barrel 13, but do not protrude, and the entire homogenizing device can be equipped with a control system. After sampling and detecting the moisture content and loose density data of the powder, the data are input into the control system, and qualified data are set in advance as a comparison data group. Then the control system compares and analyzes the input actual data with the pre-set qualified data. When the analysis shows that the actual moisture data is too large or too small, and the loose density does not meet the specifications, the control system controls the drying blower or the water mist generator to start, replenish water or dry, and controls the corresponding feeding bin 7 to replenish and adjust in time; it should be noted that the feeding bin 7 is equipped with a weighing sensing component, which can detect the overall weight of the feeding bin 7, so that the control system can open or close the corresponding feeding bin 7 in time according to the weight of the required discharged powder.

[0038] In some specific embodiments, in combination Figures 1 to 3As shown, the first vibrating screening mechanism 15 includes a screening drum 9, a driving motor 24 and a vibrating screen plate 30. The screening drum 9 is fixedly arranged at the bottom of the spray drying tower 1, and the two are connected through a pipe body. The vibrating screen plate 30 is tiltedly arranged inside the screening drum 9, and the vibrating screen plate 30 is also slidably connected to the screening drum 9. Screen holes are evenly distributed on the vibrating screen plate 30. An inclined conduit 29 is fixedly connected to the side of the screening drum 9 close to the ITO slurry stirring tank 4, and the vibrating screen plate 30 is matched with the inclined conduit 29 and docked, specifically connected to the inclined conduit 29 at the lower end. The inclined conduit 29 can be designed into a corresponding shape according to the shape and size of the screening drum 9. For example, the inclined conduit 29 is designed as a flat plate-shaped conduit, the bottom of the screening drum 9 is an inclined plate, and one side of the bottom of the screening drum 9 is connected to the powder tank 11 through a conduit, and the connection side is the lower side, that is, it meets the requirements. The required powder passes through the vibrating screen plate 30, and then flows into the powder tank 11 along the inclined bottom. The larger coarse powder that does not meet the requirements flows to the inclined conduit 29 through the vibrating screen plate 30. The end of the inclined conduit 29 is connected to a dispersion tank 6. Pure water can be injected into the dispersion tank 6 to facilitate the dispersion of the larger coarse powder discharged along the inclined conduit 29 into the water to become a fluid. The dispersion tank 6 is connected to the recovery grinding mechanism to facilitate the transportation of the water-powder mixture to the recovery grinding mechanism for grinding. Guide rods 31 are fixedly connected to both sides of the bottom of the vibrating screen plate 30, and the guide rods 31 slide through the bottom of the screening drum 9. A limit spring 32 is connected between the guide rod 31 and the screening drum 9, and the limit spring 32 is outside the screening drum 9 and is in a compressible state. A lifting linkage mechanism is connected between the guide rod 31 and the drive motor 24.

[0039] Among them, the lifting linkage mechanism includes a linkage plate 33 and a cam 25. The linkage plate 33 is fixedly connected to the bottom of the guide rod 31. The cam 25 is fixedly connected to the main shaft of the driving motor 24 through a shaft rod, and the cam 25 is cooperated to be located at the bottom of the linkage plate 33. After the driving motor 24 is started, the cam 25 is driven to rotate. During the rotation process, the cam 25 continuously squeezes the linkage plate 33 through the end, so that the linkage plate 33 drives the guide rod 31 to rise, and the guide rod 31 drives the vibrating screen plate 30 to rise a certain distance. During this process, the limit spring 32 is compressed to generate a rebound force. Whenever the cam 25 is separated from the linkage plate 33, the guide rod 31 drives the vibrating screen plate 30 to descend and reset under the action of the rebound force of the limit spring 32, and this is repeated, thereby realizing up and down vibration, which is convenient for promoting the vibration screening effect.

[0040] In some specific embodiments, in order to facilitate the grinding of liquid coarse powder raw materials mixed in water, the recovery and grinding mechanism includes a sand mill 5, which is also called a bead mill and is mainly used for wet grinding of chemical liquid products. A filter cartridge is arranged inside the sand mill 5, and grinding media, such as zirconium sand, are dispersed in the filter cartridge. A zirconium disk driven to rotate by a motor is also arranged. A suction pump for conveying liquid to the sand mill 5 is installed on one side of the bottom of the dispersion tank 6. The sand mill 5 stirs the liquid by the zirconium disk so that the dispersed zirconium sand continuously collides and grinds the liquid coarse sand. A conveying pump body connected to the ITO slurry stirring tank 4 is fixedly installed on one side of the bottom of the sand mill 5. The recycled ground coarse sand is conveyed to the ITO slurry stirring tank 4 by the conveying pump body, and then spray-dried again.

[0041] In some specific embodiments, a discharge pipe 14 is fixedly connected to the bottom of the homogenizing mixing barrel 13, and a first solenoid valve 43 is installed on the discharge pipe 14, a second vibrating screening mechanism 16 is installed at the bottom of the discharge pipe 14, and the second vibrating screening mechanism 16 has the same structure as the first vibrating screening mechanism 15, and the dispersion tank 6 of the second vibrating screening mechanism 16 is connected to the sand mill 5 through a pump body, and a finished product discharge pipe is installed on one side of the bottom of the screening barrel 9 of the second vibrating screening mechanism 16 for discharging the finished product powder.

[0042] In some specific embodiments, such as Figure 3 As shown, the negative pressure fan mechanism includes an exhaust fan, a filter element and a suction pipe 34. The exhaust fan is installed on the top of the auxiliary tower 10, and a filter element is installed at the connection position between the exhaust fan and the auxiliary tower 10. One end of the suction pipe 34 is inside the spray drying tower 1, and the other end is connected with the auxiliary tower 10. A conical baffle cap is fixedly installed at one end of the suction pipe 34 inside the spray drying tower 1, and suction holes are circumferentially opened on the suction pipe 34 near the conical baffle cap. The exhaust fan generates negative pressure when it is running, so that the suction pipe 34 relies on the suction holes to suck away the air in the spray drying tower 1, take away the evaporated and dried water, and suck the generated fine powder into the auxiliary tower 10, and the bottom of the auxiliary tower 10 is connected with the powder tank 11 through the tube body, so that the sucked powder is conveniently settled in the powder tank 11 for easy use. It should be noted that the suction negative pressure generated by the exhaust fan here is set to a suitable value to avoid sucking coarse powder and to achieve separate recovery by relying on the weight difference between coarse powder and fine powder.

[0043] In some specific embodiments, such as Figure 2 and Figure 6As shown, the transition feeding mechanism includes a transition barrel 12 and a support rail 28, a layered bracket 8 is arranged on one side of the auxiliary tower 10, and the layered bracket 8 includes a support vertical rod and a layered plate, a feeding bin 7 is arranged on the top of the layered bracket 8, and the feeding bin 7 is supported by a weighing sensing component, and a second solenoid valve 40 is fixedly installed at the bottom of the feeding bin 7, and a corrugated hose is connected between the second solenoid valve 40 and the top of the transition barrel 12, and the corrugated hose communicates with the second solenoid valve 40 and the transition barrel 12, and the transition feeding mechanism also includes a trigger control mechanism, and the trigger control mechanism is used to control the switch of the second solenoid valve 40, the support rail 28 is horizontally fixedly connected to the layered bracket 8 near the top, the transition barrel 12 is slidably connected to the support rail 28, and the homogenizing mixing barrel 13 is fixedly arranged on the layered bracket 8, A strip-shaped feed port 41 is provided at the top of the homogenizing mixing barrel 13, and the bottom of the transition barrel 12 is funnel-shaped and connected to the strip-shaped feed port 41. A closed slide 19 that fits in with the outer wall of the homogenizing mixing barrel 13 is also fixedly connected to the bottom of the transition barrel 12, and the closed slide 19 is used to close the strip-shaped feed port 41. The length and width of the closed slide 19 are both larger than the corresponding dimensions of the strip-shaped feed port 41, and it can slide back and forth laterally relative to the strip-shaped feed port 41 to ensure closure. A stirring shaft 42 is rotatably arranged inside the homogenizing mixing barrel 13, and a telescopic rotating linkage mechanism coaxially arranged with the stirring shaft 42 is arranged on the outside of the homogenizing mixing barrel 13. The telescopic rotating linkage mechanism cooperates with the main shaft of the driving motor 24, and a reciprocating sliding mechanism is also connected between the stirring shaft 42 and the closed slide 19.

[0044] The reciprocating sliding mechanism includes a first steering bevel gear 22, a second steering bevel gear 18, a first linkage rod 21 and a second linkage rod 20. The first steering bevel gear 22 is rotatably arranged on the outside of the homogenizing mixing barrel 13. Specifically, a bracket is fixedly connected to the outer wall of the homogenizing mixing barrel 13, and the first steering bevel gear 22 is rotatably connected to the bracket through a rotating shaft. One end of the stirring shaft 42 extends to the outside of the homogenizing mixing barrel 13, and the second steering bevel gear 18 is coaxially connected to the end of the stirring shaft 42. The two rotate synchronously, and the second steering bevel gear 18 is meshed with the first steering bevel gear 22. One side of the first steering bevel gear 22 is coaxially fixed. An extension shaft is fixedly connected, and the first linkage rod 21 is vertically fixedly connected to the end of the extension shaft. The end of the first linkage rod 21 forms an eccentric structure relative to the first steering bevel gear 22. The end of the first linkage rod 21 is rotatably connected to the second linkage rod 20 through a swivel pin, and the end of the second linkage rod 20 away from the first linkage rod 21 is rotatably connected to the closed slide 19 through a swivel pin. It should be noted that if the end of the second linkage rod 20 cannot be directly connected to the closed slide 19, a connecting frame can be welded on one side of the closed slide 19, and then the second linkage rod 20 is rotatably connected to the connecting frame through a rotating shaft, and is indirectly connected to the closed slide 19.

[0045] When the stirring shaft 42 rotates, it drives the first steering bevel gear 22 to rotate through the second steering bevel gear 18, and the first steering bevel gear 22 drives the first linkage rod 21 to rotate. The first linkage rod 21 pushes and pulls the closed slide plate 19 through the second linkage rod 20, so that the closed slide plate 19 drives the transition tube 12 to slide back and forth along the support guide rail 28, which is convenient for sliding feeding during feeding, ensuring that the supplementary powder is quickly dispersed and added to the original powder, which is convenient for accelerating mixing.

[0046] In some specific embodiments, in combination Figures 4 to 6 As shown, the telescopic rotation linkage mechanism includes a square telescopic rod 46, a first bevel friction wheel 35, a second bevel friction wheel 27 and a transmission belt 23. The square telescopic rod 46 is coaxially fixedly connected to the extended end of the stirring shaft 42. The first bevel friction wheel 35 is coaxially fixedly connected to the telescopic end of the square telescopic rod 46. A limit ring 38 is also fixedly connected to the square telescopic rod 46. A push-pull ring 37 is arranged between the limit ring 38 and the first bevel friction wheel 35. The square telescopic rod 46, the limit ring 38 and the first bevel friction wheel 35 can rotate relative to the push-pull ring 37, and the outer diameters of the limit ring 38 and the first bevel friction wheel 35 are larger than the outer diameter of the push-pull ring 37. An auxiliary electric telescopic rod 36 is fixedly connected to the top of the layered bracket 8. The telescopic end of the auxiliary electric telescopic rod 36 is fixedly connected to the push-pull ring 37 through the rod body. The trigger control mechanism is electrically connected to the auxiliary electric telescopic rod 36 for controlling the extension and retraction of the auxiliary electric telescopic rod 36. The second bevel friction wheel 27 is cooperatively arranged on the first bevel friction wheel 27. The first and second inclined friction wheels 27 are both truncated cone-shaped and have anti-skid grooves on the inclined surfaces. The two wheels are not in contact with each other in the initial state. The main shaft end of the driving motor 24 and the second inclined friction wheel 27 are coaxially fixedly connected with a transmission wheel 26. The two transmission wheels 26 are connected by a transmission belt 23. During the operation of the driving motor 24, the second inclined friction wheel 27 is driven to rotate synchronously through the transmission wheel 26 and the transmission belt 23. When the auxiliary electric telescopic rod 36 is extended, since the push-pull ring 37 is between the limit ring 38 and the first inclined friction wheel 35, the square telescopic rod 46 can be extended through the push-pull ring 37, so that the first inclined friction wheel 35 contacts the second inclined friction wheel 27. In this way, the first inclined friction wheel 35 can be driven to rotate by the rotating second inclined friction wheel 27, thereby linking the stirring shaft 42 to rotate synchronously.

[0047] In some specific embodiments, such as Figure 7As shown, when two groups of feeding bins 7 are provided, two groups of trigger control mechanisms are also provided, which are respectively used to control the switch of the second solenoid valve 40 corresponding to the feeding bin 7 and the extension and retraction of the auxiliary electric telescopic rod 36. The trigger control mechanism includes a main electric telescopic rod 39, a first switch group 44 and a second switch group 45. The main electric telescopic rod 39 is fixedly connected to the top of the layered bracket 8, and a protrusion is provided at the extension end of the main electric telescopic rod 39. The first switch group 44 and the second switch group 45 are distributed on both sides of the protrusion, and the first switch group 44 and the second switch group 45 are fixedly connected to the top of the layered bracket 8. A valve opening switch for controlling the opening of the corresponding second solenoid valve 40 is also provided, and an extension control switch for controlling the extension of the auxiliary electric telescopic rod 36 is also provided. The second switch group 45 is provided with a valve closing switch for controlling the closing of the corresponding second solenoid valve 40, and a contraction control switch for controlling the contraction of the auxiliary electric telescopic rod 36. The valve opening switch, the valve closing switch, the extension control switch, and the contraction control switch are all pressure switches, which generate pressure feedback when squeezed, so that it is convenient to rely on the matching controller to control the corresponding second solenoid valve 40 switch and control the extension and contraction of the auxiliary electric telescopic rod 36.

[0048] When it is necessary to open the corresponding feeding bin 7 to replenish the powder in the homogenizing mixing barrel 13, the control system controls the corresponding main electric telescopic rod 39 to extend, and the telescopic end of the main electric telescopic rod 39 is squeezed onto the first switch group 44 by the convex block, so that the valve opening switch and the extension control switch are acted on. The valve opening switch opens the corresponding second solenoid valve 40, and at the same time, the extension control switch extends the auxiliary electric telescopic rod 36 to facilitate feeding. In this process, the weight of the feeding bin 7 is monitored by the weighing sensing component. When the weight is reduced to the corresponding value, the main electric telescopic rod 39 is controlled to retract. At this time, the convex block at the telescopic end of the main electric telescopic rod 39 is squeezed onto the valve closing switch and the contraction control switch on the second switch group 45, so that the auxiliary electric telescopic rod 36 is retracted and reset, and the second solenoid valve 40 is closed in time.

[0049] In order to facilitate the understanding of the embodiments of this solution by those skilled in the art, the working principle of this solution is briefly described in combination with specific application scenarios:

[0050] First, the ITO slurry is stirred and mixed by the ITO slurry stirring tank 4, and then the ITO slurry is delivered to the sprayer 2 through the delivery pump. The ITO slurry is atomized by the sprayer 2 and sprayed into the spray drying tower 1 to form countless small droplets. At the same time, the hot air blower 3 inputs high-temperature gas into the spray drying tower 1 to contact the atomized droplets to evaporate and dry them, thereby obtaining ITO powder; and the negative pressure fan mechanism is used to suck and discharge the evaporated water, and at the same time, the fine powder is sucked into the auxiliary tower 10, and then falls into the powder tank 11.

[0051] The coarse powder obtained in the spray drying falls into the screening cylinder 9 and is screened by the vibrating screen plate 30. The driving motor 24 continuously drives the cam 25 to rotate. During the rotation process, the cam 25 continuously squeezes the linkage plate 33 through the end, so that the linkage plate 33 drives the guide rod 31 to rise, and the guide rod 31 drives the vibrating screen plate 30 to rise a distance. During this process, the limit spring 32 is compressed to generate a rebound force. Whenever the cam 25 is separated from the linkage plate 33, the guide rod 31 drives the vibrating screen plate 30 to descend and reset under the action of the rebound force of the limit spring 32, and this is repeated, thereby realizing up and down vibration, which is convenient for promoting the vibration screening effect.

[0052] The powder that meets the requirements passes through the vibrating screen plate 30, and then flows into the powder tank 11 along the inclined bottom. The larger coarse powder that does not meet the requirements flows through the vibrating screen plate 30 to the inclined conduit 29, and enters the dispersion tank 6 through the inclined conduit 29. The dispersion tank 6 is filled with pure water, which makes it convenient for the larger coarse powder discharged along the inclined conduit 29 to be dispersed in the water to become a fluid, and then transported to the sand mill 5 for grinding, and finally returned to the ITO slurry stirring tank 4, and then transported to the spray drying tower 1 again for drying.

[0053] The powder entering the powder tank 11 is transported to the homogenizing mixing cylinder 13 by the vacuum pump 17, and then a portion of the ITO powder is taken out through the sampling hole on one side of the bottom of the homogenizing mixing cylinder 13, and then the moisture content and bulk density of the powder sample are detected by instruments, for example, a high-precision capacitive moisture sensor and a bulk density detector are used to measure the moisture and bulk density respectively, and the data are input into the control system, and the control system compares and analyzes the input actual data with the pre-set qualified data. When the analysis shows that the actual moisture data is too large or too small, the control system controls the drying blower or the water mist generator to start, replenish water or dry, and controls the drying blower to output hot air with appropriate temperature and flow rate according to the detected moisture data, or controls the water mist emitter to run for a corresponding time;

[0054] When the analysis shows that the bulk density does not meet the specification, the corresponding feeding bin 7 is controlled to feed, and the ratio of coarse powder to fine powder in the powder is adjusted in time. The specific feeding process is: the corresponding main electric telescopic rod 39 is controlled to extend, and the telescopic end of the main electric telescopic rod 39 is squeezed onto the first switch group 44 by the convex block, so that the valve opening switch and the extension control switch are acted on, and the valve opening switch causes the corresponding second solenoid valve 40 to open, and at the same time, the extension control switch causes the auxiliary electric telescopic rod 36 to extend, and the powder in the feeding bin 7 with the second solenoid valve 40 opened flows into the transition tube 12. At the same time, when the auxiliary electric telescopic rod 36 is extended, since the push-pull ring 37 is between the limit ring 38 and the first inclined friction wheel 35, the square telescopic rod 46 can be pushed to extend through the push-pull ring 37, so that the first inclined friction wheel 35 contacts the second inclined friction wheel 27;

[0055] During the operation of the driving motor 24, the second inclined friction wheel 27 is driven to rotate synchronously through the transmission wheel 26 and the transmission belt 23, so that the first inclined friction wheel 35 can be driven to rotate by the rotating second inclined friction wheel 27, thereby linking the stirring shaft 42 to rotate synchronously, so as to facilitate the stirring and mixing of the powder in the homogenizing mixing barrel 13, so that the added powder can be quickly and evenly mixed;

[0056] At the same time, when the stirring shaft 42 rotates, it drives the first steering bevel gear 22 to rotate through the second steering bevel gear 18, and the first steering bevel gear 22 drives the first linkage rod 21 to rotate, and the first linkage rod 21 pushes and pulls the closed slide plate 19 through the second linkage rod 20, so that the closed slide plate 19 drives the transition cylinder 12 to slide back and forth along the support guide rail 28, which is convenient for reciprocating motion when replenishing materials, ensuring that the supplementary powder is quickly dispersed and added to the original powder, facilitating accelerated mixing, thereby facilitating uniform distribution of each part of the powder in the mixture, improving the overall quality of the powder, and ensuring stable product quality. Finally, the first solenoid valve 43 at the bottom of the homogenizing mixing cylinder 13 is opened, and the material is discharged to the second vibrating screening mechanism 16 for re-screening through the discharge pipe 14, and the possible aggregates are screened out, and then transported to the sand mill 5 for grinding again, while other finished powders are discharged for subsequent processing.

[0057] Several embodiments of the present invention are described in detail above, but the embodiments of the present invention are not limited thereto and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A device for homogenizing ITO powder with stable quality, comprising a spray drying tower (1), a sub-tower (10), an ITO slurry stirring tank (4), a powder tank (11) and a homogenizing mixing cylinder (13); a negative pressure fan mechanism connected to the spray drying tower (1) is arranged on the top of the sub-tower (10); a vacuum pump (17) is connected between the homogenizing mixing cylinder (13) and the powder tank (11), characterized in that: Also includes: A first vibrating screening mechanism (15) and a recovery grinding mechanism, wherein the first vibrating screening mechanism (15) is arranged at the bottom of the spray drying tower (1), one side of the first vibrating screening mechanism (15) is connected to the powder tank (11), the first vibrating screening mechanism (15) is used to screen the ITO powder discharged from the spray drying tower (1), and the recovery grinding mechanism is used to grind the coarse powder screened by the first vibrating screening mechanism (15), and transport the ground coarse powder to the ITO slurry stirring tank (4); A feeding mechanism, the feeding mechanism comprising a feeding bin (7) and a transition feeding mechanism, the transition feeding mechanism being used to guide the powder in the feeding bin (7) into the homogenizing mixing cylinder (13).

2. The ITO powder homogenizing device with stable quality according to claim 1, characterized in that: The first vibrating screening mechanism (15) comprises a screening drum (9), a driving motor (24) and a vibrating screen plate (30), wherein the screening drum (9) is fixedly arranged at the bottom of the spray drying tower (1), the vibrating screen plate (30) is obliquely arranged inside the screening drum (9), and the vibrating screen plate (30) is also slidably connected to the screening drum (9), a side of the screening drum (9) close to the ITO slurry stirring tank (4) is fixedly connected to an inclined conduit (29), and the vibrating screen plate (30) cooperates with and docks with the inclined conduit (29), and the screening drum (9) The bottom of the vibrating screen plate (30) is in the shape of an inclined plate, and one side of the bottom of the screening drum (9) is connected to the powder tank (11). The end of the inclined guide tube (29) is connected to a dispersion tank (6), and the dispersion tank (6) is connected to a recovery grinding mechanism. Both sides of the bottom of the vibrating screen plate (30) are fixedly connected to guide rods (31), and the guide rods (31) slide through the bottom of the screening drum (9). A limit spring (32) is connected between the guide rod (31) and the screening drum (9), and a lifting linkage mechanism is connected between the guide rod (31) and the driving motor (24).

3. The ITO powder homogenizing device with stable quality according to claim 2, characterized in that: The lifting linkage mechanism comprises a linkage plate (33) and a cam (25); the linkage plate (33) is fixedly connected to the bottom of the guide rod (31); the cam (25) is fixedly connected to the main shaft of the drive motor (24), and the cam (25) is located at the bottom of the linkage plate (33).

4. The ITO powder homogenizing device with stable quality according to claim 2, characterized in that: The recovery grinding mechanism comprises a sand mill (5), a suction pump for conveying liquid into the sand mill (5) is installed on one side of the bottom of the dispersion tank (6), and a conveying pump body connected to the ITO slurry stirring tank (4) is fixedly installed on one side of the bottom of the sand mill (5).

5. The ITO powder homogenizing device with stable quality according to claim 2, characterized in that: A drying blower and a water mist generator are installed on the side wall of the homogenizing mixing cylinder (13); a discharge pipe (14) is fixedly connected to the bottom of the homogenizing mixing cylinder (13), and a first solenoid valve (43) is installed on the discharge pipe (14); a second vibrating screening mechanism (16) is installed at the bottom of the discharge pipe (14); the second vibrating screening mechanism (16) has the same structure as the first vibrating screening mechanism (15), and the dispersion tank (6) of the second vibrating screening mechanism (16) is connected to the sand mill (5); and a finished product discharge pipe is installed on one side of the bottom of the screening cylinder (9) of the second vibrating screening mechanism (16).

6. The ITO powder homogenizing device with stable quality according to claim 1, characterized in that: The negative pressure fan mechanism comprises an exhaust fan, a filter element and a suction pipe (34); the exhaust fan is installed on the top of the auxiliary tower (10), and the filter element is installed at the position where the exhaust fan and the auxiliary tower (10) are connected; one end of the suction pipe (34) is located inside the spray drying tower (1), and the other end is connected to the auxiliary tower (10); a conical blocking cap is fixedly installed on the end of the suction pipe (34) located inside the spray drying tower (1), and suction holes are circumferentially opened on the suction pipe (34) near the conical blocking cap; the bottom of the auxiliary tower (10) is connected to the powder tank (11) through a pipe body.

7. The ITO powder homogenizing device with stable quality according to claim 1, characterized in that: The transition feeding mechanism comprises a transition barrel (12) and a support rail (28), a layered support (8) is arranged on one side of the auxiliary tower (10), the feeding bin (7) is arranged on the top of the layered support (8), a second solenoid valve (40) is fixedly installed at the bottom of the feeding bin (7), a corrugated hose is connected between the second solenoid valve (40) and the top of the transition barrel (12), the corrugated hose connects the second solenoid valve (40) and the transition barrel (12), the transition feeding mechanism also comprises a trigger control mechanism, the trigger control mechanism is used to control the switch of the second solenoid valve (40), the support rail (28) is horizontally fixedly connected to the layered support (8) near the top, the transition barrel (12) is slidably connected to the support rail (28), and the homogenizing mixing barrel ( 13) is fixedly arranged on the layered bracket (8), and a strip-shaped feed port (41) is opened on the top of the homogenizing mixing barrel (13), and the bottom of the transition barrel (12) is connected to the strip-shaped feed port (41), and the bottom of the transition barrel (12) is also fixedly connected to a closed slide plate (19) which is matched with the outer wall of the homogenizing mixing barrel (13), and the closed slide plate (19) is used to close the strip-shaped feed port (41), and a stirring shaft (42) is rotatably arranged inside the homogenizing mixing barrel (13), and a telescopic rotating linkage mechanism coaxially arranged with the stirring shaft (42) is arranged on the outer side of the homogenizing mixing barrel (13), and the telescopic rotating linkage mechanism is matched with the main shaft of the driving motor (24), and a reciprocating sliding mechanism is also matched between the stirring shaft (42) and the closed slide plate (19).

8. The ITO powder homogenizing device with stable quality according to claim 7, characterized in that: The reciprocating sliding mechanism comprises a first steering bevel gear (22), a second steering bevel gear (18), a first linkage rod (21) and a second linkage rod (20); the first steering bevel gear (22) is rotatably arranged on the outside of the homogenizing mixing barrel (13); one end of the stirring shaft (42) extends to the outside of the homogenizing mixing barrel (13); the second steering bevel gear (18) is coaxially connected to the end of the stirring shaft (42); the second steering bevel gear (18) is meshed with the first steering bevel gear (22); one side of the first steering bevel gear (22) is coaxially fixedly connected to an extension shaft; the first linkage rod (21) is vertically fixedly connected to the end of the extension shaft; the end of the first linkage rod (21) is rotatably connected to the second linkage rod (20); the end of the second linkage rod (20) away from the first linkage rod (21) is rotatably connected to the closed slide plate (19).

9. The ITO powder homogenizing device with stable quality according to claim 7, characterized in that: The telescopic rotation linkage mechanism comprises a square telescopic rod (46), a first inclined friction wheel (35), a second inclined friction wheel (27) and a transmission belt (23); the square telescopic rod (46) is coaxially fixedly connected to the extended end of the stirring shaft (42); the first inclined friction wheel (35) is coaxially fixedly connected to the telescopic end of the square telescopic rod (46); a limit ring (38) is also fixedly connected to the square telescopic rod (46); a push-pull ring (37) is provided between the limit ring (38) and the first inclined friction wheel (35); the top of the layered bracket (8) is fixedly connected to An auxiliary electric telescopic rod (36), the telescopic end of the auxiliary electric telescopic rod (36) is fixedly connected to the push-pull ring (37), the trigger control mechanism is electrically connected to the auxiliary electric telescopic rod (36), the second bevel friction wheel (27) is arranged on one side of the first bevel friction wheel (35), and the second bevel friction wheel (27) is rotatably connected to one side of the layered bracket (8), the main shaft end of the drive motor (24) and the second bevel friction wheel (27) are coaxially fixedly connected with a transmission wheel (26), and the two transmission wheels (26) are connected by a transmission belt (23).

10. The ITO powder homogenizing device with stable quality according to claim 9, characterized in that: The trigger control mechanism comprises a main electric telescopic rod (39), a first switch group (44) and a second switch group (45); the main electric telescopic rod (39) is fixedly connected to the top of the layered bracket (8); a protrusion is arranged at the telescopic end of the main electric telescopic rod (39); the first switch group (44) and the second switch group (45) are distributed on both sides of the protrusion; the first switch group (44) is provided with a valve opening switch for controlling the opening of the corresponding second solenoid valve (40), and is also provided with an extension control switch for controlling the extension of the auxiliary electric telescopic rod (36); the second switch group (45) is provided with a valve closing switch for controlling the closing of the corresponding second solenoid valve (40), and is also provided with a contraction control switch for controlling the contraction of the auxiliary electric telescopic rod (36).

Images