Equipment for preparing high-purity magnesium oxide and control method thereof

Abstract

The invention relates to the technical field of magnesium oxide preparation, in particular to equipment for preparing high-purity magnesium oxide and a control method thereof.The equipment comprises a support, the top of the support is fixedly connected with a reaction container, a controller is fixedly installed on the side wall of the support, and the equipment further comprises two screening discs used for screening and pushing target objects; the driving unit is arranged in the reaction container and is used for driving the two sieving discs to be close to or far away from each other; the two sets of swaying screening assemblies are arranged on the sides, close to each other, of the two screening discs correspondingly, and through the arrangement of the swaying screening assemblies, on one hand, stubborn large particle block raw materials can be crushed into smaller fragments, so that the particle sizes of the materials tend to be consistent, and on the other hand, the particle sizes of the materials tend to be consistent. And the newly generated small particles can be promoted to enter the swaying screening assembly conveniently.

Description

Technical Field

[0001] The invention relates to the field of magnesium oxide preparation, and in particular to a device for preparing high-purity magnesium oxide and a control method thereof. Background Art

[0002] Magnesium oxide is an oxide of magnesium, an ionic compound. It is a white solid at room temperature. High-purity magnesium oxide has excellent alkali resistance and electrical insulation at high temperatures. It has high thermal expansion coefficient and thermal conductivity and good light transmittance. It is widely used as a high-temperature heat-resistant material.

[0003] In the prior art, the production of light magnesium carbonate is usually carried out in a reaction device, which is designed to promote the chemical reaction of dolomite powder (mainly composed of calcium magnesium carbonate and magnesium carbonate) with carbon dioxide at a specific temperature and pressure to produce magnesium carbonate. However, dolomite powder has at least the following problems in the reaction device: 1. Because the particle size of solid raw materials such as dolomite is uneven and unsuitable, particles that are too large or too small will affect the uniformity of mixing and reaction; 2. There may be local accumulation and voids in dolomite powder, which may cause uneven mixing of dolomite powder and carbon dioxide, which not only affects the reaction rate of preparing high-purity magnesium oxide, but also seriously affects the purity of magnesium oxide. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a device for preparing high-purity magnesium oxide and a control method thereof.

[0005] To achieve the above objectives, in a first aspect, the present invention provides an apparatus for preparing high-purity magnesium oxide, comprising a support, a reaction vessel is fixedly connected to the top of the support, a controller is fixedly installed on the side wall of the support, and further comprising: Two screening plates for screening and pushing the target objects; A driving unit, disposed inside the reaction container, for driving the two screening plates to move closer to or farther from each other; Two sets of shaking screening components are respectively arranged on the sides of the two screening plates close to each other; In the process of the driving unit driving the two screening plates to approach each other, the two sets of the shaking screening components are used to push and aggregate the target objects on the internal travel route in the reaction container, and screen and crush the particle size in the process of pushing and aggregating; Among them, the swaying screening component will impact the remaining raw materials through swinging action during the movement. On the one hand, it helps to break up the stubborn large particles into smaller pieces to make the material particle size tend to be consistent. On the other hand, it helps to promote these newly generated small particles to enter the interior of the swaying screening component. At this time, the swaying screening component will dynamically participate in the refinement of the raw materials in this process, and after the raw materials are collected into the interior of the swaying screening component, the dynamic impact force generated by the internal swing of the swaying screening component will help to subdivide the raw materials again to ensure that they meet the required particle size specifications.

[0006] Preferably, the driving unit comprises: A first motor, wherein the first motor is fixedly mounted on a side wall of the reaction container; A bidirectional threaded rod is fixedly mounted on the output shaft end of the first motor, and the screening disc is threadedly connected to the outer wall of the bidirectional threaded rod.

[0007] Preferably: the swaying screening assembly comprises: An electric push rod is fixedly mounted on the side wall of the sieving plate; A U-shaped frame, the U-shaped frame is fixedly connected to the telescopic end of the electric push rod; A fan-shaped screening frame is rotatably connected to the side wall of the screening plate, and a filter hole is provided at the bottom of the fan-shaped screening frame; Two collecting slots are respectively provided on the two side walls of the fan-shaped screening frame; A square column is fixedly connected to the fan-shaped screening frame, and the square column is located between the two side walls of the U-shaped frame.

[0008] Preferably, it also includes multiple groups of auxiliary crushing components, and the auxiliary crushing components include: A grinding disc, rotatably connected to the side wall of the fan-shaped screening frame; A connecting column, fixedly connected to the center of one side of the grinding disc close to the fan-shaped screening frame; A rectangular filter screen is fixedly connected to an end of the connecting column away from the grinding disc; A torsion spring is fixedly installed between the rectangular filter screen and the grinding disc, and the torsion spring is sleeved between the connecting columns; A retaining column fixedly connected to the side wall of the screening screen; A plurality of groups of crushing rollers, each group of crushing rollers having a plurality of crushing rollers, are fixedly connected to the side wall of the grinding disc in a circumferential array.

[0009] Preferably, it also includes: A plurality of decomposition knives are respectively fixedly connected to two sides of the rectangular filter screen at corresponding positions.

[0010] Preferably, it also includes: A detection unit, used for obtaining weight information; A second motor, wherein the second motor is fixedly mounted on a side wall of the sieve; The crushing roller is fixedly connected to the output shaft end of the second motor.

[0011] Preferably, the detection unit is specifically a weight sensor, and the weight sensor is fixedly mounted on the inner bottom surface of the fan-shaped screening frame.

[0012] In a second aspect, the present invention provides a control method for an apparatus for preparing high-purity magnesium oxide, the control method comprising the following steps: The controller receives the weight information obtained by the weight sensor; The controller generates first control information according to the weight information; The controller sends the third control information to the motor to control the motor to start.

[0013] Preferably: the specific workflow of step one is: Set a threshold in advance; The controller compares the received weight information with the threshold value; If it is less than the threshold, no feedback will be given; If it is greater than the threshold, weight information is generated.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention adopts the setting of a swaying screening component. During the movement of the swaying screening component, the swaying screening component will impact the remaining raw materials through a swinging action. On the one hand, it helps to break up the stubborn large particles of raw materials into smaller pieces, so that the particle size of the materials tends to be consistent. On the other hand, it helps to promote these newly generated small particles to enter the interior of the swaying screening component. At this time, the swaying screening component will dynamically participate in the refinement of the raw materials in this process, and after the raw materials are collected in the interior of the swaying screening component, the dynamic impact force generated by the internal swing of the swaying screening component will help to subdivide the raw materials again to ensure that they reach the required particle size specifications.

[0015] 2. The present invention uses the rectangular filter and the crushing roller to decompose and crush the raw materials gathered in front of the fan-shaped screening frame during the deflection process, thereby helping to decompose the raw materials into small particles. After different groups of crushing rollers located on the two fan-shaped screening frames approach each other, because different crushing rollers are staggered, the two crushing rollers will cross each other, which is conducive to crushing the raw materials again. In the process of the grinding disc swinging back, the crushing rollers located in relative positions and on the same plane will also rotate, thereby effectively utilizing the synergistic effect of the double roller group, which is conducive to more detailed secondary crushing of the raw materials and ensures that the raw materials are fully decomposed to the desired particle size.

[0016] 3. The present invention obtains the weight information of the raw materials accumulated inside the fan-shaped screening frame through the setting of the crushing roller through the detection unit. If it exceeds the preset value range, the controller controls the second motor to start working, and the second motor drives the crushing roller to start rolling, thereby helping to quickly break the accumulated raw materials into small pieces; and the rectangular filter helps to push the raw materials in the direction of the crushing roller during the process of deflecting and returning to push the raw materials, thereby helping the crushing roller to crush and decompose the raw materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a flow chart of the control method of the present invention.

[0018] Figure 2 The overall structure of the detection device of the present invention is shown in FIG. Figure 1 .

[0019] Figure 3 The overall structure of the detection device of the present invention is shown in FIG. Figure 2 .

[0020] Figure 4 It is a schematic structural diagram of the present invention along the cross section of the reaction vessel.

[0021] Figure 5 For the present invention Figure 4 An enlarged schematic diagram of the structure of section A is shown.

[0022] Figure 6 The structure diagram of the connection between the sieve plate and the bidirectional threaded rod of the present invention is shown in FIG. Figure 1 .

[0023] Figure 7 The structure diagram of the connection between the sieve plate and the bidirectional threaded rod of the present invention is shown in FIG. Figure 2 .

[0024] Figure 8 For the present invention Figure 7 An enlarged schematic diagram of the structure of part B is shown.

[0025] Fig. 9It is a schematic structural diagram of the connection between the bidirectional threaded rod and the fan-shaped screening frame of the present invention.

[0026] Fig.10 For the present invention Fig. 9 An enlarged schematic diagram of the C-section structure is shown.

[0027] In the figure: 1. support; 101. feed port; 102. discharge port; 2. reaction container; 3. controller; 4. screening plate; 5. first motor; 6. bidirectional threaded rod; 7. electric push rod; 8. U-shaped frame; 9. fan-shaped screening frame; 10. filter hole; 11. collecting slot hole; 12. square column; 13. grinding plate; 14. connecting column; 15. rectangular filter; 16. torsion spring; 17. blocking column; 18. crushing roller; 19. decomposition knife; 20. second motor; 21. crushing roller; 22. weight sensor. DETAILED DESCRIPTION

[0028] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0029] Application scenario: In the prior art, the production of light magnesium carbonate is usually carried out in a reaction device, which is designed to promote the chemical reaction of dolomite powder (mainly composed of calcium magnesium carbonate and magnesium carbonate) with carbon dioxide at a specific temperature and pressure to produce magnesium carbonate. However, dolomite powder has at least the following problems in the reaction device: 1. Because the particle size of solid raw materials such as dolomite is uneven and unsuitable, particles that are too large or too small will affect the uniformity of mixing and reaction; 2. There may be local accumulation and voids in dolomite powder, which may cause uneven mixing of dolomite powder and carbon dioxide, which not only affects the reaction rate of preparing high-purity magnesium oxide, but also seriously affects the purity of magnesium oxide.

[0030] like Figures 2 to 10 The device for preparing high-purity magnesium oxide shown in the figure comprises a support 1, a reaction container 2 is fixedly connected to the top of the support 1, a controller 3 is fixedly installed on the side wall of the support 1, and further comprises: Two screening plates 4, used to screen and push the target objects; A driving unit, disposed inside the reaction container 2, for driving the two sieving plates 4 to move closer to or away from each other; Two sets of shaking screening components are respectively arranged on the sides of the two screening plates 4 close to each other; In the process of the driving unit driving the two screening plates 4 to approach each other, the two sets of shaking screening components are used to push and gather the target objects on the internal travel route in the reaction container 2, and screen and crush the particle size in the process of pushing and gathering; In the specific implementation, the operator first places the raw material to be prepared into the reaction container 2, and then adds the required substances and gas components in sequence as required. At the same time, the driving unit is started to ensure that the entire reaction process is carried out under precise control. The rotation of the driving unit will drive the two screening discs 4 to approach each other. In the process of the two screening discs 4 approaching each other, those fine particles with a diameter smaller than the sieve hole can pass smoothly, while the larger particles that cannot be screened will be pushed to the center of the reaction container 2 by the combined force of the two discs. In this interaction, the two screening discs 4 will drive the swaying screening components at the corresponding positions to approach each other, and the swaying screening components will impact the remaining screened raw materials through a swinging action during the movement, which will help to separate the stubborn particles. On the one hand, it can break up large pieces of raw materials into smaller pieces, making the particle size of the materials tend to be consistent. On the other hand, it can help to promote these newly generated small particles to enter the interior of the swaying screening component. At this time, the swaying screening component will dynamically participate in the refinement of the raw materials in this process, and after the raw materials are collected into the interior of the swaying screening component, the dynamic impact force generated by the swinging of the swaying screening component will help to subdivide the raw materials again to ensure that they reach the required particle size specifications, and the broken particles that meet the specifications will fall into the interior of the reaction vessel 2 through the swaying screening component. In this process, because the swaying screening components are gradually approaching each other, it is also helpful to prevent local accumulation of raw materials.

[0031] It should be noted that the reaction container 2 is provided with corresponding existing parts such as a feed port 101, a discharge port 102 and an air inlet, which will not be disclosed in detail here.

[0032] As a technical optimization solution of the present invention: the driving unit includes: A first motor 5, the first motor 5 is fixedly mounted on the side wall of the reaction container 2; The bidirectional threaded rod 6 is fixedly mounted on the output shaft end of the first motor 5, and the screening plate 4 is threadedly connected to the outer wall of the bidirectional threaded rod 6; In a specific implementation, the controller 3 controls the first motor 5 to start, and the first motor 5 drives the bidirectional threaded rod 6 to rotate, and the bidirectional threads drive the screening plates 4 on the corresponding threaded parts to move closer to or away from each other.

[0033] It should be noted that the diameter of the sieve disc 4 is equal to the inner diameter of the reaction container 2, the outer wall of the sieve disc 4 fits the inner diameter of the reaction container 2, and under the restriction of the inner wall of the reaction container 2, the sieve disc 4 cannot rotate, so as to help the sieve discs 4 approach each other.

[0034] As a technical optimization solution of the present invention: the swaying screening component includes: The electric push rod 7 is fixedly mounted on the side wall of the sieve plate 4; A U-shaped frame 8, which is fixedly connected to the telescopic end of the electric push rod 7; The fan-shaped screening frame 9 is rotatably connected to the side wall of the screening plate 4, and a filter hole 10 is opened at the bottom of the fan-shaped screening frame 9; Two collecting slots 11 are respectively provided on the two side walls of the fan-shaped screening frame 9; A square column 12 is fixedly connected to the fan-shaped screening frame 9, and the square column 12 is located between the two side walls of the U-shaped frame 8; In the specific implementation, the controller 3 controls the electric push rod 7 to start extension and retraction, and the electric push rod 7 pushes the U-shaped frame 8 to move. After the side wall of the U-shaped frame 8 contacts the square column 12, it will push the square column 12 to swing, and the square column 12 drives the fan-shaped screening frame 9 to swing. The fan-shaped screening frame 9 will hit the raw material blocks on the travel route during the swinging process, which helps to break down large fragments into small fragments. In this process, the fan-shaped screening frame 9 effectively pushes the raw materials deposited at the bottom of the reaction container 2 toward both sides. This process helps to evenly spread these accumulated raw materials and prevents a large amount of materials from piling up in front of the fan-shaped screening frame 9, thereby avoiding the problem of increased movement resistance caused by excessive accumulation. The swinging of the fan-shaped screening frame 9 not only promotes the dispersion of the raw materials, but also helps to ensure that its moving path is unobstructed. The raw materials dispersed by impact will enter the interior of the fan-shaped screening frame 9 through the collecting slot 11, which is conducive to utilizing the dynamic impact force generated by the swing of the fan-shaped screening frame 9 to further decompose and crush the raw materials entering the fan-shaped screening frame 9, and make the crushed materials that meet the specifications fall back through the filter hole 10 after crushing, while those that do not meet the specifications are repeatedly crushed again until they meet the requirements and are discharged.

[0035] As a technical optimization solution of the present invention: it also includes multiple sets of auxiliary crushing components, and the auxiliary crushing components include: The grinding disc 13 is rotatably connected to the side wall of the fan-shaped screening frame 9; A connecting column 14 is fixedly connected to the center of one side of the grinding disc 13 close to the fan-shaped screening frame 9; A rectangular filter screen 15 is fixedly connected to an end of the connecting column 14 away from the grinding disc 13; The torsion spring 16 is fixedly installed between the rectangular filter screen 15 and the grinding disc 13, and the torsion spring 16 is sleeved between the connecting columns 14; The blocking column 17 is fixedly connected to the side wall of the screen; A plurality of groups of crushing rollers 18, each group of crushing rollers 18 having a plurality of crushing rollers, all of which are fixedly connected to the side wall of the grinding disc 13 in a circumferential array; In the specific implementation, the above example illustrates that, with the help of the repeated action of the fan-shaped screening frame 9, the larger raw material blocks can be broken multiple times and gradually refined into small particles that meet the specified size. However, in the process of the fan-shaped screening frames 9 approaching each other, a part of the fragments that are difficult to handle often accumulates in front of them. These fragments are not easy to be completely crushed to an ideal state for various reasons. Therefore, during the swinging of the fan-shaped screening frame 9, the grinding disc 13 will also be driven to rotate, the grinding disc 13 will drive the connecting column 14 to swing, and the connecting column 14 will drive the rectangular filter 15 to swing. Due to the restriction of the blocking column 17, after the rectangular filter 15 contacts the blocking column 17, the rectangular filter 15 will deflect with the connecting column 14 as the axis. After the rectangular filter 15 deflects, the grinding disc 13 will be driven to deflect through the connecting column 14, and the grinding disc 13 will drive the crushing roller 18 to rotate, so that the crushing roller 18 is used to decompose the raw materials gathered in front of the fan-shaped screening frame 9 during the deflection process. Crushing, which helps to decompose the raw materials into small particles, and after the different groups of crushing rollers 18 located on the two fan-shaped screening frames 9 are close to each other, because the different crushing rollers 18 are staggered, the two crushing rollers 18 will cross each other, which is conducive to crushing the raw materials again, and in the process of the grinding disc 13 swinging back, the crushing rollers 18 located in the relative position and on the same plane will also rotate, thereby effectively utilizing the synergistic effect of the double roller group, which is conducive to more detailed secondary crushing of the raw materials and ensures that the raw materials are fully decomposed to the desired particle size; And in the process of the two rectangular filter screens 15 flipping back to their original positions, the spring force generated by the torsion spring 16 will push the material better toward the inner center of the fan-shaped screening frame 9 through the movement of the rectangular filter screen 15, which helps to prevent the raw materials from being thrown out through the collecting slot during the subsequent swinging process.

[0036] It should be particularly noted that there are two sector-shaped screening frames 9, and each sector-shaped screening frame 9 is provided with three groups of crushing rollers 18. The two groups of crushing rollers 18 located in different sector-shaped screening frames 9 are opposite to each other, are in relative positions and are located on the same horizontal plane. The circumferential array of each group of crushing rollers 18 forms a circle, and the circles formed by the two opposite groups of crushing rollers 18 have different diameters, so that when the opposite crushing rollers 18 are close to one of the groups, they are located in the circle of the other group.

[0037] As a technical optimization solution of the present invention: it also includes: A plurality of decomposition knives 19 are respectively fixedly connected to two sides of the rectangular filter screen 15 at corresponding positions; In the specific implementation, it is mentioned in the above embodiment that some raw materials that do not meet the particle size standard will be introduced into the fan-shaped screening frame 9 for further refinement. However, simply relying on the kinetic energy generated during the swinging process for crushing may result in a low processing rate and affect the overall production efficiency; Therefore, by providing the decomposition knife 19, the raw material is decomposed and crushed after contacting the blade of the decomposition knife 19 during the shaking process, which helps to enhance the crushing efficiency and helps to avoid the internal accumulation of the fan-shaped screening frame 9.

[0038] As a technical optimization solution of the present invention: it also includes: A detection unit, used for obtaining weight information; A second motor 20, the second motor 20 is fixedly mounted on the side wall of the sieve; The crushing roller 21 is fixedly connected to the output shaft end of the second motor 20; In a specific implementation, the detection unit obtains the weight information of the raw materials accumulated inside the fan-shaped screening frame 9. If it exceeds the predetermined value range, the controller 3 controls the second motor 20 to start working, and the second motor 20 drives the crushing roller 21 to start rolling, thereby helping to quickly break the accumulated raw materials into small pieces. In the process of the rectangular filter screen 15 deflecting and returning to push the raw material, it helps to push the raw material toward the crushing roller 21, thereby helping the crushing roller 21 to crush and decompose the raw material.

[0039] As a technical optimization solution of the present invention: the detection unit is specifically a weight sensor 22, and the weight sensor 22 is fixedly installed on the inner bottom surface of the fan-shaped screening frame 9; In a specific implementation, the weight information is obtained by the provided weight sensor 22, and the result is fed back to the controller 3 for analysis.

[0040] like Figure 1 A control method for a device for preparing high-purity magnesium oxide is shown, and the control method comprises the following steps: The controller 3 receives the weight information obtained by the weight sensor 22; The controller 3 generates first control information according to the weight information; The controller 3 sends the third control information to the motor to control the motor to start.

[0041] As a technical optimization solution of the present invention: the specific workflow of step 1 is as follows: Set a threshold in advance; The controller 3 compares the received weight information with the threshold value; If it is less than the threshold, no feedback will be given; If it is greater than the threshold, weight information is generated.

[0042] Working principle of the present invention: The operator first places the raw material to be prepared into the reaction container 2, and then adds the required substances and gas components in sequence as required. At the same time, the driving unit is started to ensure that the entire reaction process is carried out under precise control. The rotation of the driving unit will drive the two screening discs 4 to approach each other. In the process of the two screening discs 4 approaching each other, those fine particles with a diameter smaller than the sieve hole can pass smoothly, and the larger particles that cannot be screened will be pushed to the center of the reaction container 2 by the combined force of the two discs. In this interaction, the two screening discs 4 will drive the swaying screening components at the corresponding positions to approach each other, and the swaying screening components will impact the remaining raw materials through the swinging action during the movement, which will help to remove stubborn large pieces. The granular raw materials are broken into smaller pieces, so that the particle size of the materials tends to be consistent. On the other hand, it helps to encourage these newly generated small particles to enter the interior of the swaying screening component. At this time, the swaying screening component will dynamically participate in the refinement of the raw materials in this process, and after the raw materials are collected in the interior of the swaying screening component, the dynamic impact force generated by the swinging of the swaying screening component will help to subdivide the raw materials again to ensure that they reach the required particle size specifications, and the broken particles that meet the specifications will fall into the interior of the reaction vessel 2 through the swaying screening component. In this process, because the swaying screening components are gradually approaching each other, it is also helpful to prevent local accumulation of raw materials.

[0043] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention, and these changes and improvements fall within the scope of the present invention claimed.

Claims

1. A device for preparing high-purity magnesium oxide, comprising a support (1), a reaction container (2) being fixedly connected to the top of the support (1), and a controller (3) being fixedly mounted on the side wall of the support (1), characterized in that: Also includes: Two screening plates (4) for screening and pushing the target object; A driving unit, arranged inside the reaction container (2), and used for driving the two sieve plates (4) to move closer to or farther from each other; Two sets of shaking screening components are respectively arranged on the sides of the two screening plates (4) close to each other; In the process of the driving unit driving the two screening plates (4) to approach each other, the two sets of the shaking screening components are used to push and aggregate the target objects on the internal travel route in the reaction container (2), and to screen and crush the particle size during the pushing and aggregation process.

2. The device for preparing high-purity magnesium oxide according to claim 1, characterized in that: The driving unit comprises: A first motor (5), the first motor (5) being fixedly mounted on a side wall of the reaction container (2); A bidirectional threaded rod (6) is fixedly mounted on the output shaft end of the first motor (5), and the screening plate (4) is threadedly connected to the outer wall of the bidirectional threaded rod (6).

3. A device for preparing high-purity magnesium oxide according to claim 2, characterized in that: The sway screening assembly comprises: An electric push rod (7) fixedly mounted on the side wall of the sieving plate (4); A U-shaped frame (8), the U-shaped frame (8) being fixedly connected to the telescopic end of the electric push rod (7); A fan-shaped screening frame (9) is rotatably connected to the side wall of the screening plate (4), and a filter hole (10) is formed at the bottom of the fan-shaped screening frame (9); Two collecting slots (11) are respectively provided on two side walls of the fan-shaped screening frame (9); A square column (12) is fixedly connected to the fan-shaped screening frame (9), and the square column (12) is located between the two side walls of the U-shaped frame (8).

4. The device for preparing high-purity magnesium oxide according to claim 3, characterized in that: It also includes multiple sets of auxiliary crushing components, the auxiliary crushing components include: A grinding disc (13) rotatably connected to a side wall of the fan-shaped screening frame (9); A connecting column (14) fixedly connected to the center of one side of the grinding disc (13) close to the fan-shaped screening frame (9); A rectangular filter screen (15) fixedly connected to an end of the connecting column (14) away from the grinding disc (13); A torsion spring (16) is fixedly mounted between the rectangular filter screen (15) and the grinding disc (13), and the torsion spring (16) is sleeved between the connecting columns (14); A retaining column (17) fixedly connected to the side wall of the screen; A plurality of groups of crushing rollers (18), each group of crushing rollers (18) having a plurality of crushing rollers (18), are fixedly connected to the side wall of the grinding disc (13) in a circular array.

5. The device for preparing high-purity magnesium oxide according to claim 4, characterized in that: Also includes: A plurality of decomposition knives (19) are respectively fixedly connected to two sides of the rectangular filter screen (15) at corresponding positions.

6. The device for preparing high-purity magnesium oxide according to claim 3, characterized in that: Also includes: A detection unit, used for obtaining weight information; A second motor (20), the second motor (20) being fixedly mounted on a side wall of the sieve; The crushing roller (21) is fixedly connected to the output shaft end of the second motor (20).

7. The device for preparing high-purity magnesium oxide according to claim 6, characterized in that: The detection unit is specifically a weight sensor (22), and the weight sensor (22) is fixedly mounted on the inner bottom surface of the fan-shaped screening frame (9).

8. A control method for a device for preparing high-purity magnesium oxide, applicable to the device for preparing high-purity magnesium oxide according to claim 7, characterized in that: The control method comprises the following steps: The controller (3) receives weight information acquired by the weight sensor (22); The controller (3) generates first control information according to the weight information; The controller (3) sends third control information to the motor to control the start of the motor.

9. A control method for a device for preparing high-purity magnesium oxide according to claim 8, characterized in that: The specific workflow of step one is as follows: Set a threshold in advance; The controller (3) compares the received weight information with a threshold value; If it is less than the threshold, no feedback will be given; If it is greater than the threshold, weight information is generated.

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