Production device and method for preparing precision casting mullite sand powder

Abstract

The invention relates to the related technical field of preparation of precision casting sand powder, in particular to a production device and method for preparing precision casting mullite sand powder.The production device comprises a flour mill, a valve is arranged on the surface of one side of the flour mill, a feeding groove is formed in the surface of one side of the flour mill, and a discharging port is formed in the surface of one side of the flour mill; a rack is fixedly mounted on the lower surface of the flour mill, a conveying mechanism is arranged on the surface of one side of the flour mill, and a screening mechanism is arranged on the surface of one side of the rack. According to the production device and method for preparing the precision casting mullite sand powder, when raw materials are conveyed into the flour mill, the raw materials firstly enter the material conveying opening, at the moment, the material rolling motor is started, the raw materials are conveyed into the material storage tank through the material conveying pipe, and then the raw materials enter the flour mill through the material conveying opening to be crushed; the arrangement of the material storage tank can ensure the continuous supply of the raw materials, thereby avoiding the idle running of the flour mill caused by insufficient supply of the raw materials, improving the production efficiency and reducing the energy consumption.

Description

Technical Field

[0001] The invention relates to the technical field related to preparation of precision casting sand powder, and in particular to a production device and method for preparing precision casting mullite sand powder. Background Art

[0002] Preparation of precision casting sand powder is an important technology in the foundry industry. Precision casting sand powder is widely used in the field of investment casting industry. The traditional precision casting sand production method is to crush the block kaolinite ore into granular materials after calcination, and then screen them into precision casting sand products of different particle sizes. Because the calcined kaolinite block has a high hardness, the Mohs hardness is seven to eight. The production process using this process has a lot of dust, low output, high labor intensity, and large wear and tear on the crushing equipment during the crushing process. Impurities such as foreign iron are easily mixed into the crushed material. In order to improve production efficiency, reduce energy consumption, reduce environmental pollution, and ensure the quality of precision casting sand powder, a production device and method for preparing precision casting mullite sand powder is particularly needed.

[0003] However, the existing production equipment for preparing precision casting mullite sand powder has some shortcomings, such as complex equipment structure, inconvenient operation, high maintenance cost, and poor adaptability to the environment during the production process. Most traditional methods for preparing precision casting sand powder also have problems such as low efficiency, high energy consumption, and serious dust pollution, which are difficult to meet the requirements of modern industry for the quality and production efficiency of precision casting sand powder. Summary of the invention

[0004] The purpose of the present invention is to provide a production device and method for preparing precision casting mullite sand powder, so as to solve some of the shortcomings mentioned in the above background technology, such as complex equipment structure, inconvenient operation, high maintenance cost, and poor adaptability to the environment during the production process. Most traditional methods for preparing precision casting sand powder still have problems such as low efficiency, high energy consumption, and serious dust pollution, and it is difficult to meet the requirements of modern industry for the quality and production efficiency of precision casting sand powder.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solutions: a production device and method for preparing precision casting mullite sand powder, comprising a grinding mill, a valve is arranged on one side surface of the grinding mill, a feed trough is arranged on one side surface of the grinding mill, a discharge port is arranged on one side surface of the grinding mill, a frame is fixedly mounted on the lower surface of the grinding mill, a feeding mechanism is arranged on one side surface of the grinding mill, and a screening mechanism is arranged on one side surface of the frame;

[0006] The feeding mechanism includes a feeding pipe, a storage tank, a bracket, a feeding port and a coiling motor. The feeding pipe is fixedly connected to one side surface of the grinding mill, the feeding pipe is fixedly connected to one side surface of the storage tank, a bracket is sleeved on the outer surface of the storage tank, the feeding port is fixedly connected to one side surface of the storage tank, and a coiling motor is arranged on one side surface of the feeding port.

[0007] Preferably, a grinding mill is fixedly connected to one side surface of the feed pipe, and a storage tank is fixedly connected to the other side surface of the feed pipe.

[0008] Preferably, the coiling motor cooperates with the feeding port to feed materials, and the bracket is symmetrically arranged with respect to the width center axis of the feeding port.

[0009] Preferably, the screening mechanism includes a base, a limit column, a spring, a shell, a vibration motor, a screen, a first discharging plate and a second discharging plate. The base is placed on one side surface of the frame, the upper surface of the base is fixedly connected to the limit column, the outer surface of the limit column is sleeved and fixed with a spring, one side surface of the spring is fixedly connected to the shell, one side surface of the shell is fixedly installed with a vibration motor, the inner surface of the shell is fixedly connected to the screen, the inner surface of the shell is fixedly connected to the first discharging plate, and the inner surface of the shell is fixedly connected to the second discharging plate.

[0010] Preferably, the first discharge plate and the second discharge plate are symmetrically arranged with respect to the central axis of the shell, and the discharge directions of the first discharge plate and the second discharge plate are opposite.

[0011] Preferably, one side surface of the spring is fixedly connected to a base, and the other side surface of the spring is fixedly connected to a shell.

[0012] Preferably, the upper and lower positions of the limit posts correspond one to one, and are both arranged on the inner surface of the spring, and the first discharge plate is fixedly connected to one side surface of the screen.

[0013] Preferably, the spring and the housing form a telescopic structure, and the limiting columns are symmetrically arranged with respect to the central axis of the base.

[0014] Preferably, a production device and method for preparing precision casting mullite sand powder and a method of using the production device and method for preparing precision casting mullite sand powder as described above are characterized in that the steps are as follows:

[0015] S1, raw material mixing;

[0016] S2, mixed solution preparation;

[0017] S3, sand mold preparation;

[0018] S4, taking out the mold and drying.

[0019] Compared with the prior art, the invention has the following beneficial effects: the production device and method for preparing precision casting mullite sand powder have the following beneficial effects:

[0020] 1. Through the setting of the feeding pipe, storage tank, bracket, feeding port and coiling motor, when the raw materials are conveyed into the grinding mill, the raw materials first enter the feeding port, then the coiling motor is started, and the raw materials are conveyed to the storage tank through the feeding pipe, and then the raw materials enter the grinding mill through the feeding port for crushing. The setting of the storage tank can ensure the continuous supply of raw materials, avoid the idling of the grinding mill due to insufficient raw material supply, improve production efficiency and reduce energy consumption.

[0021] 2. Through the arrangement of the base, the limit column, the spring, the housing, the vibration motor, the screen, the first discharge plate and the second discharge plate, after the raw materials are crushed by the grinding mill, mullite sand powder of different particle sizes can be obtained. The start of the vibration motor causes the screen in the housing to vibrate, thereby screening the crushed material. The fine mullite sand powder falls into the second discharge plate through the pores of the screen, while the larger particles are intercepted by the screen and slide to the first discharge plate. In this way, the particle size of the mullite sand powder can be accurately controlled to ensure the quality of the final product.

[0022] 3. When processing raw materials, raw material selection and processing: First, select minerals with a kaolinite content greater than 90% as raw materials, crush and screen them, calcination: send the screened sand into the rotary kiln for calcination, the calcination temperature is controlled at 1100-1500℃, and the calcination time is generally 1-4 hours. This process aims to improve the physical and chemical properties of the raw materials through high-temperature treatment, and prepare for subsequent shaping and impurity removal. Shaping and impurity removal: After calcination, the product is shaped and impurity removed to remove impurities and improve the shape and size of the product. This step is crucial to improving the quality and performance of the product. Screening again: After shaping and impurity removal, the product is screened again to obtain products of different specifications. This step can adjust the sieved particle size and specifications according to specific needs to meet the needs of different applications. Quality assurance: During the production process, a strict quality inspection and quality assurance system is implemented to ensure that the quality and performance of the product meet the standards. This includes strict control of each zirconium mullite from ore mining, calcination, dust removal and iron removal finishing to performance testing. Through the above steps, it can be made Prepare precision casting mullite sand powder with high mullite phase, good refractory and low melting point to meet the needs of precision casting and other fields. Mix the raw materials, mix silicate, quartz powder and aluminum materials in a certain proportion to ensure uniform mixing. Mixed liquid preparation: add appropriate amount of water and adhesive to the mixed raw materials to make a mixed liquid, among which the water content should be 8% to 11%, and the adhesive content should be about 1% to 3%. After the mixed liquid is made, it needs to be stirred and sieved. Sand mold preparation: inject the mixed liquid into the sand mold, pass The sand mold is fully filled by vibration and compaction, and then the sand mold is placed in an environment with suitable temperature. After it solidifies, it is demolded. Demolding and drying: take out the sand mold and dry it to below room temperature to eliminate moisture and adhesives to ensure the strength and stability of the sand mold for subsequent precision casting operations. High-quality precision casting mullite sand powder can be prepared to meet the strict requirements of the precision casting industry for sand powder. The entire production process realizes the precise proportioning, mixing, preparation, crushing, screening, refining and packaging of raw materials to ensure the stability and consistency of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall appearance structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the structure of the screening mechanism of the present invention;

[0025] Figure 3 It is a schematic diagram of the structure of the feeding mechanism of the present invention;

[0026] Figure 4 It is a front view structural schematic diagram of the present invention;

[0027] Figure 5 For the present invention Figure 2 The enlarged structural diagram at A in the middle;

[0028] Figure 6 The present invention is a schematic structural diagram of the production method for preparing precision casting mullite sand powder.

[0029] In the figure: 1. grinding mill; 2. valve; 3. feed chute; 4. discharge port; 5. frame; 6. feeding mechanism; 601. feeding pipe; 602. storage tank; 603. bracket; 604. feeding port; 605. winding motor; 7. screening mechanism; 701. base; 702. limit column; 703. spring; 704. housing; 705. vibration motor; 706. screen; 707. first discharge plate; 708. second discharge plate. DETAILED DESCRIPTION

[0030] 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.

[0031] See also Figure 1-6 The present invention provides a technical solution: a production device and method for preparing precision casting mullite sand powder, comprising a grinding mill 1, a valve 2 is provided on one side surface of the grinding mill 1, a feeding trough 3 is provided on one side surface of the grinding mill 1, a discharge port 4 is provided on one side surface of the grinding mill 1, a frame 5 is fixedly installed on the lower surface of the grinding mill 1, a feeding mechanism 6 is provided on one side surface of the grinding mill 1, and a screening mechanism 7 is provided on one side surface of the frame 5;

[0032] The feeding mechanism 6 includes a feeding pipe 601, a storage tank 602, a bracket 603, a feeding port 604 and a coiling motor 605. The feeding pipe 601 is fixedly connected to one side surface of the grinding mill 1, the storage tank 602 is fixedly connected to one side surface of the feeding pipe 601, the storage tank 602 is sleeved on the outer surface of the storage tank 602, the feeding port 604 is fixedly connected to one side surface of the storage tank 602, and the coiling motor 605 is arranged on one side surface of the feeding port 604. 602, bracket 603, feed port 604 and coil motor 605 are set. When the raw material is conveyed into the grinding mill 1, the raw material first enters the feed port 604, and then the coil motor 605 is started to convey the raw material to the storage tank 602 through the feed pipe 601. Then the raw material enters the grinding mill 1 through the feed port 604 for crushing. The setting of the storage tank 602 can ensure the continuous supply of raw materials, avoid the idling of the grinding mill 1 due to insufficient raw material supply, and improve production efficiency.

[0033] Furthermore, the screening mechanism 7 includes a base 701, a limiting column 702, a spring 703, a shell 704, a vibration motor 705, a screen 706, a first discharging plate 707 and a second discharging plate 708. The base 701 is placed on one side surface of the frame 5, the limiting column 702 is fixedly connected to the upper surface of the base 701, the spring 703 is fixedly mounted on the outer surface of the limiting column 702, the shell 704 is fixedly connected to one side surface of the spring 703, the shell 704 is fixedly installed to one side surface of the shell 704, the screen 706 is fixedly connected to the inner side surface of the shell 704, the first discharging plate 707 is fixedly connected to the inner side surface of the shell 704, and the second discharging plate 708 is fixedly connected to the inner side surface of the shell 704. The second discharging plate 708 is provided with a base 701, a limit column 702, a spring 703, a housing 704, a vibration motor 705, a screen 706, a first discharging plate 707 and a second discharging plate 708. After the raw material is crushed by the grinding mill 1, mullite sand powder of different particle sizes can be obtained. The start of the vibration motor 705 causes the screen 706 in the housing 704 to vibrate, thereby screening the crushed material. The fine mullite sand powder falls into the second discharging plate 708 through the pores of the screen 706, while the larger particles are intercepted by the screen 706 and slide to the first discharging plate 707. In this way, the particle size of the mullite sand powder can be accurately controlled to ensure the quality of the final product.

[0034] Furthermore, the coil motor 605 cooperates with the feed port 604 to feed the material, and the bracket 603 is symmetrically arranged with the width center axis of the feed port 604. Through the arrangement of the coil motor 605, continuous and uniform feeding of the raw material can be achieved, ensuring the stable operation of the grinding mill 1. The speed of the coil motor 605 can be adjusted according to actual production needs to adapt to raw materials of different types and particle sizes, ensuring the uniformity and continuity of the raw materials during the feeding process.

[0035] Furthermore, one side surface of the feed pipe 601 is fixedly connected to the grinding mill 1, and the other side surface of the feed pipe 601 is fixedly connected to the storage tank 602. Through the setting of the feed pipe 601, the raw materials can be effectively transported from the storage tank 602 to the grinding mill 1. The length and diameter of the feed pipe 601 can be designed according to actual production requirements.

[0036] Furthermore, the first discharge plate 707 and the second discharge plate 708 are symmetrically arranged with respect to the central axis of the shell 704, and the discharge directions of the first discharge plate 707 and the second discharge plate 708 are opposite. Through the setting of the second discharge plate 708, the fine mullite sand powder can be collected and guided to the corresponding collection device, while the first discharge plate 707 is responsible for transporting larger particles of material to a designated area for further processing or screening.

[0037] Furthermore, one side surface of the spring 703 is fixedly connected to the base 701, and the other side surface of the spring 703 is fixedly connected to the shell 704. Through the setting of the spring 703, the screening mechanism 7 can be buffered during the vibration process, reducing the noise generated by the vibration and the impact on the equipment, thereby improving the stability and service life of the equipment.

[0038] Furthermore, the upper and lower positions of the limit columns 702 correspond one to one, and are both arranged on the inner surface of the spring 703. The first discharge plate 707 is fixedly connected to the side surface of the screen 706. Through the setting of the limit columns 702, it can be ensured that the first discharge plate 707 remains stable during the vibration process to prevent it from being displaced or tilted during the vibration, thereby ensuring the correct sorting of the material.

[0039] Furthermore, the spring 703 and the housing 704 form a telescopic structure, and the limiting column 702 is symmetrically arranged with respect to the central axis of the base 701. Through the arrangement of the housing 704, stable support for the screening during the vibration process can be achieved.

[0040] Furthermore, a production device and method for preparing precision casting mullite sand powder is characterized by the following steps:

[0041] S1, raw material mixing;

[0042] S2, mixed solution preparation;

[0043] S3, sand mold preparation;

[0044] S4, taking out the mold and drying.

[0045] Mullite needs to be synthesized before sintering mullite sand powder.

[0046] The process of synthesizing mullite involves mixing an aluminum source and a silicon source in a certain proportion. The aluminum source usually used includes aluminum hydroxide, aluminum oxide or aluminum salt, while the silicon source can be sodium silicate, potassium silicate or silica gel, etc. The mixed raw materials need to be fully dried and ground to ensure the uniformity of the reactants.

[0047] When sintering to synthesize mullite, attention should usually be paid to controlling the Al2O3 / SiO2 ratio, the Al2O3 content is 71.8% to 77.2%, and the SiO2 content is 22.8% to 28.2%. The aluminum-silicon ratio should be between 2.55 and 3.40. If high-purity industrial alumina and fused quartz are used, the Al2O3 content should generally be 1% to 3% higher than the theoretical content of mullite. The activity of the raw materials, the synthesis of mullite by sintering is mainly completed through solid-phase reaction, so the activity of the raw materials has an important influence on its sintering performance. Proper selection of raw materials is conducive to solid-phase reaction sintering. First of all, raw materials with easy reaction and lattice defects should be selected, such as kaolinite and high-alumina bauxite. Both of them produce dehydration and phase change during heating, produce higher activity, and are conducive to solid-phase reaction and sintering. In industrial production, impurities are inevitably introduced, among which the most harmful is the semi-oxide R2O. At high temperatures, R2O inhibits the formation of mullite, which may cause mullite to decompose at high temperatures and produce more silicon-rich glass, thereby reducing the high-temperature performance of the material. The mixing and grinding method and fineness of the raw materials usually adopt wet fine grinding to improve grinding efficiency and increase the specific surface area of ​​the particles. The finer the particle size, the more structural defects it has, and the more conducive it is to the solid-phase reaction of mullite, which can shorten the sintering time, reduce the sintering temperature, sintering temperature and insulation time. Synthetic mullite generally begins to form at 1100℃, and completes the first stage at 1450℃. Then, as the temperature rises, the mullite crystals grow and develop (the second stage). At 1600-1700℃, the mullite content is almost unchanged, mainly because the sintering is more dense. At this time, the apparent porosity of the clinker is the lowest and the volume density is the highest. It is actually the third stage with a small amount of liquid phase involved. At about 1700℃, the sintering process has actually entered the final stage. Further heating will reduce the density. Coal-based lightly burned kaolin or high-purity quartz sand and industrial alumina (γ-Al2O3) are used as raw materials (particle size <325 mesh) to synthesize high-purity mullite. The Al2O3 content is designed to be 68%, 70% and 72% respectively. After batching, fine grinding, molding and drying, the raw materials are sintered in two steps at 1580℃×3h, 1630℃×3h, and 1380℃×3h+1580℃×3h. The mullite synthesized with kaolin and industrial alumina as raw materials is white, with a content higher than 90%, and its mullite content is higher than that synthesized with quartz sand. When the Al2O3 content is 68% and 72%, the mullite content is higher than 95%.2a% ZnO and 1b% zircon sand were added to the raw material with Al2O3 content of 68%. After two-step calcination at 1380℃×3h and 1580℃×3h, high-quality mullite was synthesized. The content of physical phase mullite was 97% and the volume density was 2.89g·cm-3. The mullite was prepared by wet grinding homogenization process and sintering. It was found that when the temperature was 1200℃, a small amount of mullite was generated, that is, kaolinite was transformed into primary mullite, and the mullite crystals were flaky at this time; when the temperature was 1500℃, a large amount of mullite was generated, and as the temperature continued to rise, the amount of mullite was stable, indicating that mullitization had been completed at 1500℃, and the mullite crystals developed into imperfect needles or thin strips, forming a discontinuous network structure; when the temperature was 1500℃, a large amount of mullite was generated, and as the temperature continued to rise, the amount of mullite was stable, indicating that the .... The temperature is 1700℃, and the well-developed mullite columnar crystals form a continuous and staggered spatial network structure. When processing raw materials, raw material selection and processing: First, select minerals with a kaolinite content of more than 90% as raw materials, crush and screen them, calcination: send the screened sand into the rotary kiln for calcination, and the calcination temperature is controlled at 1100-1500℃. The calcination time is generally 1-4 hours. This process aims to improve the physical and chemical properties of the raw materials through high-temperature treatment, and prepare for subsequent shaping and impurity removal. Shaping and impurity removal: After calcination, the product is shaped and impurity-removed to remove impurities and improve the shape and size of the product. This step is crucial to improving the quality and performance of the product. Screening again: After shaping and impurity removal, the product is shaped and impurity-removed again. Screening is performed to obtain products of different specifications. This step can adjust the particle size and specifications of the screening according to specific needs to meet the needs of different applications. Quality assurance: During the production process, a strict quality inspection and quality assurance system is implemented to ensure that the quality and performance of the products meet the standards. This includes strict control of each link from raw ore mining, calcination, dust removal and iron removal finishing to performance testing. Through the above steps, precision casting mullite sand powder with high mullite phase, good refractoriness and low melting point content can be prepared to meet the needs of precision casting and other fields. Raw material mixing: silicate, quartz powder and aluminum material are mixed in a certain proportion to ensure uniform mixing. Mixed liquid preparation: Add appropriate amount of water and adhesive to the mixed raw materials to make a mixed liquid , where the water content should be between 8% and 11%, and the adhesive content should be around 1% to 3%. After the mixed liquid is made, it needs to be stirred and sieved. Sand mold preparation: inject the mixed liquid into the sand mold, and fully fill the sand mold through vibration and compaction. Then place the sand mold in an environment with suitable temperature, and take the mold after it solidifies. Mold taking and drying: take out the sand mold and dry it to below room temperature to eliminate moisture and adhesives, ensure the strength and stability of the sand mold, so as to carry out subsequent precision casting operations. High-quality precision casting mullite sand powder can be prepared to meet the strict requirements of the precision casting industry for sand powder. The entire production process realizes the precise proportioning, mixing, preparation, crushing, screening, refining and packaging of raw materials, ensuring the stability and consistency of the product.

[0048] Working principle: Accurate proportioning and mixing of raw materials: Through an accurate metering system, different types of raw materials are mixed in a predetermined ratio to ensure the uniformity of the raw materials. The mixing process is usually carried out in a mixer to ensure that the various raw materials are fully mixed to form a uniform material. Crushing and screening: The mixed raw materials are first sent to the grinding mill 1 for crushing. The crushing action of the grinding mill 1 breaks the raw materials into fine particles, and then the screen 706 in the housing 704 is driven by the vibration motor 705 to vibrate. The vibration screening action separates materials of different particle sizes. The fine mullite sand powder passes through the pores of the screen 706 and falls into the second discharge plate 708, while the larger particles are intercepted by the screen 706 and slide to the first discharge plate 707. Refining and shaping: The mullite sand powder obtained after screening is further processed as needed. Refining treatment, such as re-calcination, shaping and impurity removal, to improve the purity of the product and the uniformity of particle size distribution. Quality inspection and control: During the production process, the raw materials and finished products are strictly inspected to ensure that they meet the standards of precision casting mullite sand powder. Quality control includes testing the chemical composition, particle size distribution, refractory properties, etc. of the raw materials to ensure the stability of the quality of the final product. Packaging and storage: After packaging, qualified precision casting mullite sand powder is stored in a dry and clean environment to prevent moisture absorption and contamination, and ensure the storage stability of the product. The design of the entire production device fully considers the fluidity of the material, screening efficiency and stability of the equipment. Through precise control and adjustment, the high quality and consistency of the precision casting mullite sand powder are ensured. At the same time, the device also has the characteristics of easy operation, convenient maintenance and low energy consumption, which is suitable for large-scale industrial production.

[0049] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A production device and method for preparing precision casting mullite sand powder, comprising a grinding mill (1), characterized in that: A valve (2) is provided on one side surface of the grinding mill (1), a material inlet trough (3) is provided on one side surface of the grinding mill (1), a material outlet (4) is provided on one side surface of the grinding mill (1), a frame (5) is fixedly mounted on the lower surface of the grinding mill (1), a material feeding mechanism (6) is provided on one side surface of the grinding mill (1), and a screening mechanism (7) is provided on one side surface of the frame (5); The feeding mechanism (6) comprises a feeding pipe (601), a storage tank (602), a bracket (603), a feeding port (604) and a coiling motor (605); the feeding pipe (601) is fixedly connected to one side surface of the grinding mill (1); the feeding pipe (601) is fixedly connected to one side surface of the feeding pipe (601); the storage tank (602) is fixedly connected to one side surface of the feeding pipe (601); the outer surface of the storage tank (602) is sleeved with a bracket (603); the feeding port (604) is fixedly connected to one side surface of the storage tank (602); and the coiling motor (605) is arranged on one side surface of the feeding port (604).

2. A production device and method for preparing precision casting mullite sand powder according to claim 1, characterized in that: A grinding machine (1) is fixedly connected to one side surface of the feed pipe (601), and a material storage tank (602) is fixedly connected to the other side surface of the feed pipe (601).

3. The production device and method for preparing precision casting mullite sand powder according to claim 1, characterized in that: The coiling motor (605) cooperates with the feeding port (604) to feed materials, and the bracket (603) is symmetrically arranged with respect to the width center axis of the feeding port (604).

4. The production device and method for preparing precision casting mullite sand powder according to claim 1, characterized in that: The screening mechanism (7) comprises a base (701), a limiting column (702), a spring (703), a shell (704), a vibration motor (705), a screen (706), a first discharge plate (707) and a second discharge plate (708). The base (701) is placed on one side surface of the frame (5), the limiting column (702) is fixedly connected to the upper surface of the base (701), the spring (703) is sleeved and fixed on the outer surface of the limiting column (702), the shell (704) is fixedly connected to one side surface of the spring (703), the vibration motor (705) is fixedly installed on one side surface of the shell (704), the screen (706) is fixedly connected to the inner side surface of the shell (704), the first discharge plate (707) is fixedly connected to the inner side surface of the shell (704), and the second discharge plate (708) is fixedly connected to the inner side surface of the shell (704).

5. A production device and method for preparing precision casting mullite sand powder according to claim 4, characterized in that: The first discharge plate (707) and the second discharge plate (708) are symmetrically arranged with respect to the central axis of the housing (704), and the first discharge plate (707) and the second discharge plate (708) have opposite discharge directions.

6. A production device and method for preparing precision casting mullite sand powder according to claim 4, characterized in that: One side surface of the spring (703) is fixedly connected to a base (701), and the other side surface of the spring (703) is fixedly connected to a housing (704).

7. A production device and method for preparing precision casting mullite sand powder according to claim 4, characterized in that: The upper and lower positions of the limiting columns (702) correspond one to one, and are both arranged on the inner surface of the spring (703), and the first discharge plate (707) is fixedly connected to one side surface of the screen (706).

8. The production device and method for preparing precision casting mullite sand powder according to claim 4, characterized in that: The spring (703) and the housing (704) form a telescopic structure, and the limiting columns (702) are symmetrically arranged with respect to the central axis of the base (701).

9. A production device and method for preparing precision casting mullite sand powder. A production device and method for preparing precision casting mullite sand powder as described in any one of claims 1 to 8, characterized in that: Here are the steps: S1, raw material mixing; S2, mixed solution preparation; S3, sand mold preparation; S4, taking out the mold and drying.

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