A mixing device for silicon nitride ceramic slurry

Abstract

The present invention discloses a mixing device for silicon nitride ceramic slurry, including a mixing silo, a height difference between the first outlet of the mixing silo and the inlet of a granulation tower, for the outflow of materials and the entry into the granulation tower, a first pipeline for reducing the reflux of light materials is connected between the outlet of the mixing silo and the inlet of the granulation tower, a solenoid valve is provided on the first pipeline, a second outlet of the mixing silo close to the upper layer is connected to a second pipeline, the other end outlet of the second pipeline is connected to the inlet of the granulation tower, and the light materials are transported to the granulation tower through a suction pump. The device allows the heavier lower layer materials to enter the granulation tower below through the first pipeline, while the lighter upper layer materials are directly transported to the granulation tower through the second pipeline connected to the upper end of the mixing silo and through a diaphragm plate, and the ratio of the lower layer materials to the upper layer materials is accurately controlled by controlling the diameter ratio of the first pipeline to the second pipeline.

Description

Technical Field

[0001] The invention relates to the technical field of ceramic mixing, and in particular to a mixing device for silicon nitride ceramic slurry. Background Art

[0002] The mixing process is a necessary process for mixing silicon nitride ceramic slurry. In the production process of ceramics, it is basically necessary to add solvents, binders and plasticizers to the raw materials to improve the comprehensive performance of the ceramics. At the same time, the above materials are required to be evenly mixed in a certain proportion to ensure the final use effect of the ceramics. However, binders and plasticizers are light substances compared to ceramic raw materials. When the existing mixing equipment mixes the above materials, since binders and plasticizers are lighter and ceramic raw materials are heavier, when mixing in the mixing container, the light substances and ceramic raw materials cannot be evenly mixed in the required proportion, resulting in the final ceramic performance failing to meet the requirements.

[0003] The existing bulletin number CN214871700U provides a quantitative feeding device for a bulletproof ceramic mixer, which utilizes a feed pipe, a feed bin and an electronic scale to weigh the bulletproof ceramic raw materials in the feed bin by an electronic scale, and then introduces the bulletproof ceramic raw materials of known weight in the feed bin into a mixing box through the feed pipe, thereby improving the ratio accuracy of various bulletproof ceramic production raw materials in the mixer. Although the ratio accuracy can also be improved, it still leads to the situation that the mixing cannot be uniformly performed. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a mixing device for silicon nitride ceramic slurry, comprising a stirring silo;

[0005] There is a height difference between the first outlet of the mixing silo and the inlet of the granulation tower, which is used for the outflow of materials and the inflow of materials into the granulation tower. A first pipeline for reducing the backflow of light materials is connected between the outlet of the mixing silo and the inlet of the granulation tower, and a solenoid valve is provided on the first pipeline;

[0006] The second outlet of the mixing silo close to the upper layer is connected to a second pipeline, the other end outlet of the second pipeline is connected to the inlet of the granulation tower, and the light material is transported to the granulation tower through a suction pump.

[0007] As a further description of the above technical solution, a reflux pipe is connected to the second pipe near the inlet of the granulation tower, and the reflux pipe is communicated with the stirring silo.

[0008] As a further description of the above technical solution, the reflux port of the reflux pipe is connected to the upper end of the stirring silo.

[0009] As a further description of the above technical solution, a section of the second pipeline close to the granulation tower is provided with a check valve, and a bend is provided at the connection between the check valve and the return pipeline.

[0010] As a further description of the above technical solution, the first pipeline includes a feed pipe, a discharge pipe and a plurality of bent pipes arranged between the feed pipe and the discharge pipe, and the bent pipes are used to block the backflow of lightweight materials.

[0011] As a further description of the above technical solution, the diameter ratio of the bent pipe to the second pipe is N.

[0012] As a further description of the above technical solution, the first pipeline is a vertical pipeline, and at least one one-way valve is sequentially arranged on the pipeline, and the flow direction of the medium in the one-way valve is from the stirring silo to the granulation silo.

[0013] As a further description of the above technical solution, a plurality of inclined baffles are staggeredly arranged inside the first pipeline.

[0014] As a further description of the above technical solution, the baffle is semi-elliptical.

[0015] As a further description of the above technical solution, the size of the baffle is adapted to the size of the first pipeline.

[0016] The present invention has the following beneficial effects:

[0017] The present invention allows the heavier lower layer materials to enter the granulation tower below through the first pipe, while the lighter upper layer materials are directly transported to the granulation tower through the second pipe connected to the upper end of the stirring silo and through the diaphragm plate, and by controlling the diameter ratio of the first pipe and the second pipe, the ratio of the lower layer materials to the upper layer materials is accurately controlled for mixing.

[0018] The bent pipe provided in the middle of the first pipe can reduce the light material that has entered the granulation tower from flowing back into the mixing silo through the first pipe, thereby affecting the ratio of the ceramic raw material to the light material. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the mixing equipment proposed in Example 1 of the present application;

[0020] Figure 2 This is a schematic diagram of the mixing equipment proposed in Example 2 of the present application;

[0021] Figure 3 This is a schematic diagram of the mixing equipment proposed in Example 3 of the present application.

[0022] Legend:

[0023] 1. Mixing silo; 101. First outlet; 102. Second outlet; 2. Granulating tower; 3. First pipeline; 301. Feed pipe; 302. Discharge pipe; 303. Bend pipeline; 4. Second pipeline; 5. Suction pump; 6. Reflux pipeline; 7. Check valve; 8. Bend pipe; 9. One-way valve; 10. Baffle. DETAILED DESCRIPTION

[0024] 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.

[0025] Embodiment 1:

[0026] Reference Figure 1 The mixing equipment for silicon nitride ceramic slurry provided by the present invention comprises a stirring silo 1, i.e., a slurry stirring silo, wherein a first outlet 101 at a lower end thereof is connected to an inlet of a granulation tower 2, and there is a certain height difference between the first outlet 101 and the inlet of the granulation tower 2, and the specific height difference value can be adjusted according to the actual installation needs, so that the ceramic raw materials inside the stirring silo 1 can fall into the granulation tower 2 below through a first pipe 3 under the action of their own gravity for the next process, and the first pipe 3 includes, in addition to a feed pipe 301 and a discharge pipe 302 respectively connected to the stirring silo 1 and the granulation tower 2, a further comprising a A feed pipe 301 and multiple bent pipes 303 between the discharge pipe 302, and a solenoid valve is provided on the discharge pipe 302, which is used to control the amount of ceramic raw materials falling into the granulation tower 2 below. This can prevent lightweight materials such as adhesives and plasticizers in the granulation tower from flowing back into the mixing silo at the upper end due to their lightness, resulting in a mixing ratio in the granulator being different from the pre-set ratio, affecting the final quality of the finished product. The specific number and length of the bent pipes 303 can also be set according to specific needs. In this embodiment, the number of bent pipes 303 is two, and the bent pipes 303 are of an S-shaped structure.

[0027] The second outlet 102 at the upper end of the mixing silo 1 is connected to the discharge pipe 302 through the second pipe 4, and a suction pump is provided on the second pipe 4 to directly draw light materials such as adhesives and plasticizers floating on the upper layer of the mixing silo 1 into the granulation tower 2. The diameter ratio of the first pipe 3 and the second pipe 4 is N. The value of N can be adjusted according to actual conditions. In this embodiment, N is 2. When the diameters of the first pipe 3 and the second pipe 4 are 2:1, that is, the diameter of the first pipe 3 is twice the diameter of the second pipe 14, the ratio of ceramic raw materials to light materials entering from the mixing silo 1 into the granulation tower 2 below is 2:1, thereby achieving the effect of accurately controlling the proportion of ceramic raw materials and light materials, and the structure of the entire device is simple.

[0028] A reflux pipe 6 is connected to the second pipe 4, the other end of the reflux pipe 6 is connected to the upper side of the stirring silo 1, and a check valve 7 is provided at a position of the second pipe 4 close to the granulation tower 2. The check valve 7 can return the excess slurry extracted by the suction pump 5, i.e., the diaphragm pump, to the stirring silo 1 through the reflux pipe 6, thereby ensuring that the ratio of the ceramic raw material and the light material entering the granulation tower 2 is sufficiently accurate.

[0029] Embodiment 2:

[0030] Reference Figure 2 The mixing equipment for silicon nitride ceramic slurry provided by the present invention is different from that in Example 1 in that, in this embodiment, a plurality of baffles 10 are staggered in the bent pipe 303, and the baffle 10 is a semi-elliptical thin plate, whose shape and size are adapted to the inner wall of the bent pipe 303, and there is a certain angle with the central axis of the bent pipe 303. Simply put, the baffle 10 faces the direction of raw material flow, that is, the direction of flow from the stirring silo 1 into the granulation tower 2. While ensuring the smooth flow of the ceramsite raw material, the inclined baffle 10 can also reduce the reflux of lightweight materials.

[0031] Embodiment three:

[0032] Reference Figure 3 The mixing equipment for silicon nitride ceramic slurry provided by the present invention is different from the first and second embodiments in that, in this embodiment, the first pipeline 3 is a straight pipeline, and a plurality of one-way valves 9 are arranged on the first pipeline 3. The one-way valves 9 define the flow direction of the material, so that the material can only flow from the mixing silo 1 into the granulation tower 2, avoiding the backflow of light materials. The number of one-way valves 9 can be adjusted according to the length of the first pipeline 3 in the actual application scenario, and in this embodiment, three one-way valves 9 are arranged.

[0033] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A mixing device for silicon nitride ceramic slurry, characterized in that: Including mixing silo; There is a height difference between the first outlet of the mixing silo and the inlet of the granulation tower, which is used for the outflow of materials and the inflow of materials into the granulation tower. A first pipeline for reducing the backflow of light materials is connected between the outlet of the mixing silo and the inlet of the granulation tower, and a solenoid valve is provided on the first pipeline; The second outlet of the mixing silo close to the upper layer is connected to a second pipe, the other end outlet of the second pipe is connected to the inlet of the granulation tower, and the light material is transported to the granulation tower through a suction pump; The first pipeline includes a feed pipe, a discharge pipe, and a plurality of bent pipes arranged between the feed pipe and the discharge pipe, wherein the bent pipes are used to block the backflow of the light material; A reflux pipe is connected to the second pipe near the inlet of the granulation tower, and the reflux pipe is communicated with the stirring silo.

2. The mixing device according to claim 1, characterized in that: The reflux port of the reflux pipe is communicated with the upper end of the stirring silo.

3. The mixing device according to claim 1, characterized in that: A section of the second pipeline close to the granulation tower is provided with a check valve, and a bend is provided at the connection between the check valve and the return pipeline.

4. The mixing device according to claim 1, characterized in that: The diameter ratio of the bent pipe to the second pipe is N.

5. The mixing device according to claim 1, characterized in that: The first pipeline is a vertical pipeline, and at least one one-way valve is sequentially arranged on the pipeline, and the flow direction of the medium in the one-way valve is from the stirring silo to the granulation silo.

6. The mixing device according to claim 1, characterized in that: A plurality of inclined baffles are arranged alternately inside the first pipe.

7. The mixing device according to claim 6, characterized in that: The baffle is semi-elliptical.

8. The mixing device according to claim 6, characterized in that: The size of the baffle is matched with the size of the first pipe.

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