A multi-stage automatic screening device for preparing high compression ratio powder

Abstract

The present invention discloses a multi-stage automatic screening device for preparing high compression ratio powder, comprising: at least two slurry barrels, an atomizing furnace, a hot air furnace, a cooler, a multi-stage screening mechanism and a conveying system; each slurry barrel is used to configure slurry of different concentrations, the interior of the atomizing furnace is equipped with at least two slurry spray guns, each slurry barrel conveys slurry to the slurry spray gun through a plunger pump, the hot air furnace is used to supply hot air to the atomizing furnace, the cooler is arranged at the discharge port at the bottom of the atomizing furnace, the multi-stage screening mechanism is arranged directly below the cooler, the multi-stage screening mechanism is driven by a vibration motor for screening, and the conveying system is used to convey the granular powder screened by the multi-stage screening mechanism. The present invention uses at least two slurries to configure slurries of different concentrations, so as to obtain more accurate powder particle grading, reduce the number of solid particles, and increase the number of spherical particles; through multi-stage screening, selective particle grading can be obtained to a certain extent.

Description

Technical Field

[0001] The invention relates to the technical field of ceramic powder materials, and in particular to a multi-stage automatic screening device for preparing high compression ratio powder materials. Background Art

[0002] The compression ratio of conventional powder is generally 2.3~2.4. For 13mm thick bricks (ordinary ceramic tiles), the filling depth is about 30mm and the pressing stroke is 17mm; while for 3mm thick large plates (products of this project), the filling depth is only 7mm and the pressing stroke is 4mm. Obviously, the shorter the pressing stroke, the greater the chance of horizontal density differences, especially for 2700×1200mm large plates. Conventional ceramic tile spray granulation powder, due to the large proportion of solid fine powder, has poor fluidity, and generally has a natural repose angle of ≥20° (20°~23°); secondly, the traditional granulation process is a single system slurry supply, and the particle grading control means are subject to certain restrictions. The traditional spray granulation process generally uses a 10-mesh sieve for sorting, which can only remove sticky false particles, but cannot screen out solid tiny particles and adjust the proportion of particles of different sizes. This results in the production of powder containing a certain number of solid small particles, short columnar particles and irregular particles, which is difficult to meet the production and molding requirements of ultra-thin ceramic large plates. To this end, we propose a multi-stage automatic screening device for preparing high compression ratio powder to solve the above-mentioned problems. Summary of the invention

[0003] In view of the defects of the conventional granulation process in the prior art that a single system supplies slurry, the means for controlling particle gradation is subject to certain limitations, and a more accurate powder particle gradation cannot be obtained through screening, the present invention provides a multi-stage automatic screening device for preparing high compression ratio powder to overcome the above defects.

[0004] A multi-stage automatic screening device for preparing high compression ratio powder, comprising:

[0005] At least two slurry barrels, each slurry barrel is used to prepare slurry of different concentrations;

[0006] An atomizing furnace, wherein at least two slurry spray guns are installed inside the atomizing furnace, and each of the slurry barrels conveys the slurry to the slurry spray gun through a plunger pump;

[0007] A hot air furnace, which is used to supply hot air to the atomizing furnace;

[0008] A cooler, the cooler being arranged at a discharge port at the bottom of the atomizing furnace;

[0009] A multi-stage screening mechanism, which is arranged directly below the cooler and driven by a vibration motor for screening;

[0010] A conveying system is used to convey granular powder after being screened by a multi-stage screening mechanism.

[0011] As a preferred solution, the slurry spray gun includes a high-concentration slurry spray gun and a low-concentration slurry spray gun; the high-concentration slurry spray gun and the low-concentration slurry spray gun are both arranged around the inner wall of the atomizing furnace.

[0012] As a preferred solution, the number of the high-concentration spray guns is 22 to 26; the atomization pressure of the high-concentration spray guns is 1.8 to 1.9 MPa; the number of the low-concentration spray guns is 16 to 20; the atomization pressure of the low-concentration spray guns is 1.6 to 1.7 MPa.

[0013] As a preferred solution, the slurry barrel comprises a low-concentration slurry barrel and a high-concentration slurry barrel; the water content of the slurry in the low-concentration slurry barrel is 34-36%; the water content of the slurry in the high-concentration slurry barrel is 31-33%.

[0014] As a preferred solution, the slurry in the low-concentration slurry barrel is transported to the low-concentration slurry spray gun via a first plunger pump; and the slurry in the high-concentration slurry barrel is transported to the high-concentration slurry spray gun via a second plunger pump.

[0015] As a preferred solution, an air distributor is provided on the top of the atomizing furnace; the air distributor is connected to the hot air furnace through an air duct; the temperature of the hot air furnace is ≥1250°C; the temperature of the air inlet to the air distributor is 580~620°C.

[0016] As a preferred embodiment, the multi-stage screening mechanism includes a 16-mesh sieve, a 40-mesh sieve, a 60-mesh sieve and an 80-mesh sieve from top to bottom; the 16-mesh sieve is placed directly below the cooler.

[0017] As a preferred solution, the conveying system includes a first conveying system; the first conveying system is placed below the 80-mesh sieve and is used to receive the powder particles filtered by the 80-mesh sieve.

[0018] As a preferred solution, the conveying system also includes a second conveying system; the second conveying system has a multi-stage conveying function, and each stage corresponds to a 16-mesh sieve, a 40-mesh sieve and a 60-mesh sieve.

[0019] As a preferred embodiment, the second conveying system has a three-level conveying function, the upper level of the second conveying system corresponds to a 60-mesh screen setting; the middle level of the second conveying system corresponds to a 40-mesh screen setting; and the lower level of the second conveying system corresponds to a 16-mesh screen setting.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The present invention uses at least two slurries to configure slurries of different concentrations. By configuring a dual system for slurry supply, different fluidity (concentration) slurries, atomization pressures, atomization components (spray sheets, spray cores) and other slurry supply parameters are used respectively, and dual means are used for control and adjustment, so as to obtain a more accurate powder particle gradation, reduce the number of solid particles, and increase the number of spherical particles.

[0022] 2. The present invention adopts a multi-stage screening mechanism to sort the powder particles. Through multi-stage screening, selective particle grading can be obtained to a certain extent according to process requirements. Compared with the traditional spray granulation process that only uses a 10-mesh sieve for sorting, this solution can not only remove sticky false particles, but also screen out solid tiny particles, and at the same time adjust the proportion of particles of different sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the present invention.

[0024] Figure 2 (a) is a powder product prepared by the present invention.

[0025] Figure 2 (b) It is a powder product obtained by ordinary spraying method.

[0026] In the figure: 1- low concentration slurry barrel; 2- first plunger pump; 3- high concentration slurry barrel; 4- second plunger pump; 5- atomizing furnace; 6- high concentration slurry spray gun; 7- low concentration slurry spray gun; 8- hot air furnace; 9- air separator; 10- air duct; 11- cooler; 12- multi-stage screening mechanism; 13- first conveying system; 14- second conveying system. DETAILED DESCRIPTION

[0027] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0028] In the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention; the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance; in addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] like Figure 1 As shown, the present invention provides a multi-stage automatic screening device for preparing high compression ratio powder, comprising: at least two slurry barrels, an atomizing furnace 5, a hot air furnace 8, a cooler 11, a multi-stage screening mechanism 12 and a conveying system, each slurry barrel is used to configure slurry of different concentrations; the interior of the atomizing furnace 5 is equipped with at least two slurry spray guns, and each of the slurry barrels conveys the slurry to the slurry spray gun through a plunger pump; the hot air furnace 8 is used to supply hot air to the atomizing furnace 5; the cooler 11 is arranged at the discharge port at the bottom of the atomizing furnace 5; the multi-stage screening mechanism 12 is arranged directly below the cooler 11, and the multi-stage screening mechanism 12 is driven by a vibration motor for screening; the conveying system is used to convey the granular powder screened by the multi-stage screening mechanism 12; the present invention uses at least two slurries to configure slurries of different concentrations, so as to obtain more accurate powder particle grading, reduce the number of solid particles, and increase the number of spherical particles; through multi-stage screening, selective particle grading can be obtained to a certain extent.

[0030] In some examples of the present invention, the slurry spray gun includes a high-concentration slurry spray gun 6 and a low-concentration slurry spray gun 7; the high-concentration slurry spray gun 6 and the low-concentration slurry spray gun 7 are both arranged around the inner wall of the atomizing furnace 5; the number of the high-concentration spray guns 6 is 22 to 26; the atomization pressure of the high-concentration spray gun 6 is 1.8 to 1.9 MPa; the number of the low-concentration spray guns 7 is 16 to 20; the atomization pressure of the low-concentration spray gun 7 is 1.6 to 1.7 MPa; the slurry barrel includes a low-concentration slurry barrel 1 and a high-concentration slurry barrel 2; the water content of the slurry in the low-concentration slurry barrel 1 is 34 to 36%; the water content of the slurry in the high-concentration slurry barrel 2 is 31 to 33%; the slurry in the low-concentration slurry barrel 1 is transported to the low-concentration slurry spray gun 7 via the first plunger pump 2; the high-concentration The slurry in the slurry barrel 2 is transported to the high-concentration slurry spray gun 6 through the second plunger pump 4; an air distributor 9 is provided on the top of the atomizing furnace 5; the air distributor 9 is connected to the hot blast furnace 8 through the air guide 10; the temperature of the hot blast furnace is ≥1250°C; the temperature of the air inlet to the air distributor 9 is 580~620°C; the present invention adopts at least two slurries to configure slurries of different concentrations, and adopts different fluidity (concentration) slurries, atomization pressures, atomization components (spray sheets, spray cores) and other slurry supply parameters by configuring dual systems for slurry supply, respectively, and adopts dual means for control and adjustment, so as to obtain more accurate powder particle grading, reduce the number of solid particles, and increase the number of spherical particles; conventional ceramic tile spray granulation powder, due to the large proportion of solid fine powder and poor fluidity, generally has a natural repose angle ≥20° (20°~23°), which is difficult to meet the production and molding requirements of ultra-thin ceramic slabs. The powder prepared by this scheme has a large compression ratio (400kg / cm 2 It has the characteristics of high compression ratio under pressure ≥3), good fluidity (natural repose angle ≤18°, 15°~18°), and basically hollow spherical shape.

[0031] In some examples of the present invention, the multi-stage screening mechanism 12 includes a 16-mesh sieve, a 40-mesh sieve, a 60-mesh sieve and an 80-mesh sieve from top to bottom; the 16-mesh sieve is placed directly below the cooler 11; the conveying system includes a first conveying system 13; the first conveying system 13 is placed below the 80-mesh sieve, for receiving powder particles filtered by the 80-mesh sieve; the conveying system also includes a second conveying system 14; the second conveying system 14 has a multi-stage conveying function, and each stage corresponds to a 16-mesh sieve, a 40-mesh sieve and a 60-mesh sieve setting; the second conveying system 14 has a three-stage conveying function, the upper level of the second conveying system 14 corresponds to a 60-mesh sieve setting; the middle level of the second conveying system 14 corresponds to a 40-mesh sieve setting; the lower level of the second conveying system 14 corresponds to a 16-mesh sieve setting. The present invention uses a multi-stage screening mechanism 12 to sort powder particles. Through multi-stage screening, selective particle grading can be obtained to a certain extent according to process requirements, such as Figure 2As shown in (a), compared with the traditional spray granulation process using a 10-mesh sieve for sorting, Figure 2 As shown in (b), this scheme can not only remove sticky false particles, but also screen out solid tiny particles, and at the same time adjust the proportion of particles of different sizes; among them, the corresponding relationship between the sieve mesh and the aperture is: 10 mesh (2.00mm), 16 mesh (1.18mm), 40 mesh (0.42mm), 60 mesh (0.25mm), 80 mesh (0.18mm).

[0032] In the description of this specification, the description with reference to the terms "one embodiment", "certain embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0033] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0034] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A multi-stage automatic screening device for preparing high compression ratio powder, characterized in that: include: At least two slurry barrels, each slurry barrel is used to prepare slurry of different concentrations; An atomizing furnace, wherein at least two slurry spray guns are installed inside the atomizing furnace, and each of the slurry barrels conveys the slurry to the slurry spray gun through a plunger pump; A hot air furnace, which is used to supply hot air to the atomizing furnace; A cooler, the cooler being arranged at a discharge port at the bottom of the atomizing furnace; A multi-stage screening mechanism, which is arranged directly below the cooler and driven by a vibration motor for screening; A conveying system, wherein the conveying system is used to convey the granular powder after being screened by the multi-stage screening mechanism; The slurry spray gun includes a high-concentration slurry spray gun and a low-concentration slurry spray gun; the high-concentration slurry spray gun and the low-concentration slurry spray gun are both arranged around the inner wall of the atomizing furnace; The slurry barrel comprises a low-concentration slurry barrel and a high-concentration slurry barrel; the water content of the slurry in the low-concentration slurry barrel is 34-36%; the water content of the slurry in the high-concentration slurry barrel is 31-33%.

2. A multi-stage automatic screening device for preparing high compression ratio powder according to claim 1, characterized in that: The number of the high-concentration spray guns is 22 to 26; the atomization pressure of the high-concentration spray guns is 1.8 to 1.9 MPa; the number of the low-concentration spray guns is 16 to 20; the atomization pressure of the low-concentration spray guns is 1.6 to 1.7 MPa.

3. A multi-stage automatic screening device for preparing high compression ratio powder according to claim 1, characterized in that: The slurry in the low-concentration slurry barrel is transported to the low-concentration slurry spray gun via the first plunger pump; the slurry in the high-concentration slurry barrel is transported to the high-concentration slurry spray gun via the second plunger pump.

4. A multi-stage automatic screening device for preparing high compression ratio powder according to claim 3, characterized in that: An air distributor is provided on the top of the atomizing furnace; the air distributor is connected to the hot air furnace through an air guide pipe; the temperature of the hot air furnace is ≥1250°C; the temperature of the air entering the air distributor is 580~620°C.

5. A multi-stage automatic screening device for preparing high compression ratio powder according to claim 4, characterized in that: The multi-stage screening mechanism includes a 16-mesh screen, a 40-mesh screen, a 60-mesh screen and an 80-mesh screen from top to bottom; the 16-mesh screen is placed directly below the cooler.

6. A multi-stage automatic screening device for preparing high compression ratio powder according to claim 5, characterized in that: The conveying system includes a first conveying system; the first conveying system is placed below the 80-mesh sieve and is used to receive powder particles filtered by the 80-mesh sieve.

7. A multi-stage automatic screening device for preparing high compression ratio powder according to claim 6, characterized in that: The conveying system also includes a second conveying system; the second conveying system has a multi-stage conveying function, and each stage corresponds to a 16-mesh sieve, a 40-mesh sieve and a 60-mesh sieve.

8. The multi-stage automatic screening device for preparing high compression ratio powder according to claim 7, characterized in that: The second conveying system has a three-level conveying function, the upper level of the second conveying system corresponds to a 60-mesh screen setting; the middle level of the second conveying system corresponds to a 40-mesh screen setting; and the lower level of the second conveying system corresponds to a 16-mesh screen setting.

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