Mica sheet intelligent screening device and system based on multi-stage vibration

Abstract

The present invention relates to the field of solid screening technology, and specifically to a multi-stage vibration-based intelligent screening device and system for mica sheets. The device adopts a multi-stage screening mechanism to ensure that the mica sheets are graded according to particle size. The cleaning mechanism helps to realize the automatic cleaning of the screen, so that the material on the screen plate is automatically cleaned and collected after the screening is completed, thereby improving the screening efficiency. The feedback adjustment mechanism can improve the screening efficiency of the corresponding screen plates at each level. The system monitors the weight of the material on each screen plate in real time during the screening process, analyzes the size of the material mass in different levels, and combines the changing characteristics of the material mass during the screening process to obtain the adjustment requirements of the vibration amplitude of the screening boxes at different levels, and adjusts the vertical vibration amplitude. This operation avoids the influence of the material staying on each screen plate during the screening process on the actual passing efficiency, improves the accuracy of the vibration amplitude adjustment, and further improves the screening efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of solid screening, and in particular to a mica sheet intelligent screening device and system based on multi-stage vibration. Background Art

[0002] Mica flakes are important industrial raw materials, and their screening and grading are key links in the production process, which directly affect product quality and production efficiency. However, existing screening devices have the following defects that need to be addressed:

[0003] The drawback of a single vibration mode: Existing equipment generally uses a single vibration mode with fixed parameters, and the vibration amplitude must be manually preset. In actual production, when faced with mica raw materials with different particle size distributions, the fixed vibration parameters cannot be dynamically adapted to the uneven particle size distribution, resulting in insufficient screening of fine particles or over-crushing of coarse particles.

[0004] Low cleaning and maintenance efficiency defect: For the accumulation of materials, it depends on manual disassembly and cleaning, which increases the idle time of the screening device and reduces the daily screening efficiency.

[0005] Amplitude adjustment error defect: The use of vertical vibration can reduce material accumulation to a certain extent, but as the screening process proceeds, there is a certain probability that the material that could have passed through the screen layer will stay in the layer. At this time, if the vertical vibration amplitude is directly adjusted according to the material weight obtained by the screen plate, it may lead to a large vibration error, thereby reducing the screening efficiency.

[0006] The contradiction between dynamic adjustment and equipment loss: During the screening process, the material has a certain probability of staying in the corresponding screening box at a certain level, so if the amplitude is adjusted continuously, it is easy to cause equipment loss to increase and reduce its service life. Summary of the Invention

[0007] In order to solve the above technical problems, the purpose of the present invention is to provide a mica sheet intelligent screening device and system based on multi-stage vibration. The technical solutions adopted are as follows:

[0008] One embodiment of the present invention provides a multi-stage vibration-based intelligent screening device for mica sheets, the screening device comprising a screening device body, the screening device further comprising an inlet and outlet mechanism, a multi-stage screening mechanism, a cleaning mechanism, and a feedback adjustment mechanism, each of which is mounted on the screening device body. The inlet and outlet mechanism allows material to enter or exit the screening device, the multi-stage screening mechanism is used to screen materials of different particle sizes, the cleaning mechanism is used to clean material on a screen plate 9, and the feedback adjustment mechanism is used to adjust the vibration amplitude of the screening box 3 of each target level in real time;

[0009] The feedback adjustment mechanism includes a weight sensor 19 installed at the end of each screen plate 9, a central processing unit and a control panel 17 located on one side of the screening device, and the signal output end of the weight sensor 19 is connected to the signal input end of the central processing unit and the control panel 17;

[0010] The weight sensor 19 is used to collect the material weight data of the screen plate 9 from the start-up moment of the screening device to the current moment; the central processing unit and control panel 17 are used to determine the actual weight of the material of the screening box 3 of each target level at each target moment based on the received material weight data of the screen plate 9 of each target level at each target moment, combined with the gravity coefficient and the vertical vibration frequency; wherein the target moment is the moment corresponding to the maximum point, and the target level is the second level or the third level; according to the actual weight of the material at each target moment, the vibration amplitude adjustment coefficient at the current moment is determined; the vibration amplitude adjustment coefficient is used to determine whether to adjust the vibration amplitude at the current moment, and if adjusted, the vibration amplitude adjustment system is used to adjust the vibration amplitude at the current moment to obtain the vibration amplitude at the next moment of the current moment.

[0011] Furthermore, the feeding and discharging mechanism includes a feeding assembly, a discharging assembly and a collecting tank 11;

[0012] The feed assembly is used to allow materials to enter the screening device, and the feed assembly includes a feed trough 2 and a dustproof port 13; the feed trough 2 is placed at the top of the screening device, and the dustproof port 13 is located between the feed trough 2 and the screening device. After a batch of materials is added, the dustproof port 13 is closed to prevent the mica flake dust from being dispersed;

[0013] The discharging assembly is used to discharge the material from the screening device, and the discharging assembly includes a guide plate 5 and a discharging port 10; the guide plate 5 is connected to the external collecting mechanism, and the guide plate 5 is used to guide the material into the external collecting mechanism; the discharging port 10 is located on one side of the screening box 3 of each level, and is closed during the screening process. When the screening is completed and the screen plate 9 needs to be cleaned, the discharging port 10 is opened;

[0014] The collecting trough 11 is placed at the bottom of the screening device and above the servo motor 16. The collecting trough 11 moves in a push-pull manner in the horizontal direction to collect materials after multi-stage screening.

[0015] Furthermore, the multi-stage screening mechanism includes a drive motor 1, a screening box 3, a screen plate 9, a swing assembly 12, a transmission rod 14, a drive assembly 15, a servo motor 16 and a horizontal vibration device 18;

[0016] The driving motor 1 is connected to the swing assembly 12, and the driving motor 1 provides power for the operation of the swing assembly 12;

[0017] The sieve plate 9 is placed at the bottom of the screening box 3, the aperture of the sieve plate 9 at the upper layer is larger than the aperture of the sieve plate 9 at the middle layer, and the aperture of the sieve plate 9 at the middle layer is larger than the aperture of the sieve plate 9 at the lower layer;

[0018] The screening box 3 located at each layer of the screening device has a set inclination angle to prevent material from piling up;

[0019] The swing assembly 12 is used to swing the screening box 3 on the upper layer, and the swing assembly 12 is installed on both sides of the screening box 3 on the upper layer;

[0020] The horizontal vibration device 18 is placed on the side of the screening box 3 in the middle and lower layers, and is used to generate horizontal vibration with a set frequency and amplitude, so that the screening box 3 vibrates back and forth in the horizontal direction;

[0021] The servo motor 16 is installed at the bottom of the screening device, causing the drive assembly 15 to generate vertical vibration, which is transmitted to the screening box 3 through the transmission rod 14;

[0022] For the screening boxes 3 in the middle and lower layers, the transmission rods 14 on the opposite sides are responsible for transmitting vibration and fixing them;

[0023] The vertical vibration frequency and amplitude to which the screening boxes 3 in the middle layer and the lower layer are subjected are consistent.

[0024] Furthermore, the swing assembly 12 includes a dial 121, a lever 122, a connecting seat 123, an optical axis 124, a connecting shaft 125 and a guide column 126; the operation process of the swing assembly 12 includes:

[0025] The driving motor 1 provides power to make the dial 121 rotate counterclockwise. The dial 121 is connected to the lever 122 through the guide column 126, and drives the lever 122 to move up and down. The other end of the lever 122 is connected to the connecting seat 123 through the connecting shaft 125. The connecting seat 123 is fixed on one side of the screening box 3. The connecting shaft 125 is driven by the lever 122 to rotate. When the lever 122 moves, the connecting seat 123 moves up and down along the optical axis 124; when the guide column 126 on the dial 121 rotates one circle, the connecting seat 123 moves back and forth along the optical axis 124 accordingly.

[0026] The dials 121 of the two sets of swing assemblies 12 located on the same side of the screening device have the same diameter, so that the relative position of the guide column 126 on the dial 121 is always at the farthest position in a straight line during the movement, thereby keeping the center position of the screening box 3 on the upper layer at a fixed height, while the heights on both sides change periodically.

[0027] Furthermore, the cleaning mechanism includes a baffle 4, a fixed slider 6, a flexible brush 7 and a slide rail 8; the baffle 4 is perpendicular to the sieve plate 9 and is fixed by the fixed sliders 6 on both sides; the flexible brush 7 is installed at the bottom of the baffle 4; the inclination angle of the baffle 4 is adjusted by the connecting shaft of the fixed slider 6; the slide rail 8 parallel to the sieve plate 9 is installed on each level of the screening box 3;

[0028] During the screening process, the fixed slider 6 is located at the end corresponding to the screening box 3, and the baffle 4 is in contact with the wall of the screening box;

[0029] When the screening is completed, the operation process of the cleaning mechanism includes: the fixed slider 6 drives the baffle 4 to move toward the side with the discharge port 10, the baffle 4 is used to apply lateral force to move the material, and the flexible brush 7 cleans the material particles, assisting the material particles to be screened or pass through the discharge port 10; when the fixed slider 6 moves to the position of the discharge port 10, the fixed slider 6 moves to the end for a second cleaning, and the baffle 4 is parallel to the screen plate 9 during the movement; when the baffle 4 reaches the end, it rotates and makes the plane where the baffle 4 is located perpendicular to the screen plate 9.

[0030] One embodiment of the present invention further provides a mica sheet intelligent screening system based on multi-stage vibration, comprising a memory and a processor, wherein the processor is configured to process instructions stored in the memory to implement the following process:

[0031] From the moment the screening device is started to the current moment, the material weight data of the sieve plate of each target level at each target moment is obtained; wherein the target moment is the moment corresponding to the maximum point; the target level is the second level or the third level;

[0032] According to the material weight data at each target moment, combined with the gravity coefficient and vertical vibration frequency, the actual weight of the material in the screening box of each target level at each target moment is determined;

[0033] Determining the vibration amplitude adjustment coefficient at the current moment according to the actual weight of the material at each target moment;

[0034] Using the vibration amplitude adjustment coefficient to determine whether to adjust the vibration amplitude at the current moment;

[0035] If adjustment is required, the vibration amplitude adjustment system is used to adjust the vibration amplitude at the current moment to obtain the vibration amplitude at the next moment after the current moment.

[0036] Furthermore, the actual weight of the material in each target level screening box at each target moment is determined based on the material weight data at each target moment in combination with the gravity coefficient and the vertical vibration frequency, including:

[0037] For any target level of the screening box and any target time, the vertical vibration frequency is used as the acceleration of the screening box;

[0038] Calculate the value of the acceleration plus the gravity coefficient; and use the ratio of the material weight data at the target moment to the added value as the actual weight of the material at the target moment.

[0039] Furthermore, the determining of the vibration amplitude adjustment coefficient at the current moment according to the actual weight of the material at each target moment includes:

[0040] For the screening box of the current level, a preset number of target moments adjacent to the current moment are obtained, and each target moment adjacent to the current moment constitutes the current time period;

[0041] According to the actual weight of the material at each target moment in the current period, the actual weight difference between adjacent target moments is analyzed to determine the adjustment requirement index of the vertical vibration of the current level screening box at the current moment;

[0042] Obtaining the sieve plate aperture value of the current level screening box, and determining the simulated volume of the material passing through the current level screening box according to the sieve plate aperture value;

[0043] Determine the screening efficiency index of the current level screening box at the current moment based on the simulated volume of the passed material and the actual weight of the material in the current level screening box at the current moment;

[0044] The vibration amplitude adjustment coefficient at the current moment is determined by combining the adjustment demand index and the screening efficiency index corresponding to the screening box of each target level at the current moment.

[0045] Furthermore, the actual weight of the material at each target moment in the current period is analyzed, and the actual weight difference between adjacent target moments is analyzed to determine the adjustment requirement index of the vertical vibration of the current level screening box at the current moment, including:

[0046] Calculate the actual weight difference of the materials between the previous target time and the next target time in the current period to obtain the actual weight difference of each material;

[0047] Determine the average value and variance value of all actual weight differences of the materials, and determine the adjustment requirement index of the vertical vibration of the current level screening box at the current moment according to the average value and variance value.

[0048] Furthermore, determining whether to adjust the vibration amplitude at the current moment using the vibration amplitude adjustment coefficient includes:

[0049] Determining the vibration amplitude adjustment system as an adjustment determination indicator and setting an adjustment determination threshold;

[0050] If the adjustment determination index at the current moment is greater than the adjustment determination threshold, the vibration amplitude at the current moment is adjusted; if the adjustment determination index at the current moment is less than or equal to the adjustment determination threshold, the vibration amplitude at the current moment is not adjusted.

[0051] The present invention has the following beneficial effects:

[0052] The present invention provides a multi-stage vibration-based intelligent mica flake screening device and system. The device includes a feed and discharge mechanism, a multi-stage screening mechanism, a cleaning mechanism, and a feedback adjustment mechanism. Each mechanism is mounted on the screening device body. The feed and discharge mechanism allows material to enter or exit the screening device. The multi-stage screening mechanism is used to screen materials of different particle sizes. The cleaning mechanism is used to clean material on the screen plate. The feedback adjustment mechanism is used to adjust the vibration amplitude of the screening box at each target level in real time. The multi-stage screening mechanism ensures that the mica flakes are graded according to particle size. The cleaning mechanism enables automatic cleaning of the screen, allowing the material on the screen plate to be automatically cleaned and collected after screening. This reduces the need for manual disassembly and cleaning, resulting in longer gaps and improves screening efficiency. The feedback adjustment mechanism effectively improves the screening efficiency of the corresponding screen plates at each level.

[0053] The system monitors the weight of the material on each screen plate during the screening process in real time, and obtains the adjustment requirements of the vibration amplitude of the screening boxes at different levels by analyzing the size of the material mass in different layers and combining the changing characteristics of the material mass during the screening process, thereby adjusting the vertical vibration amplitude. This operation avoids the influence of the material staying on each screen plate during the screening process on the actual passing efficiency, improves the accuracy of the vibration amplitude adjustment, and improves the screening efficiency at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the technical solutions and advantages of the embodiments of the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0055] Figure 1 Schematic diagram of the shell surface of a mica sheet intelligent screening device based on multi-stage vibration according to an embodiment of the present invention Figure 1 ;

[0056] Figure 2 Schematic diagram of the shell surface of a mica sheet intelligent screening device based on multi-stage vibration according to an embodiment of the present invention Figure 2 ;

[0057] Figure 3 Schematic diagram of the internal structure of a mica sheet intelligent screening device based on multi-stage vibration according to an embodiment of the present invention Figure 1 ;

[0058] Figure 4 Schematic diagram of the internal structure of a mica sheet intelligent screening device based on multi-stage vibration according to an embodiment of the present invention Figure 2 ;

[0059] Figure 5 Schematic diagram C of the detailed structure of a feeding assembly of a mica sheet intelligent screening device based on multi-stage vibration according to an embodiment of the present invention;

[0060] Figure 6 Schematic diagram D of the detailed structure of a discharging assembly of a mica sheet intelligent screening device based on multi-stage vibration according to an embodiment of the present invention;

[0061] Figure 7 Schematic diagram A of the detailed structure of the swing assembly 12 of a mica sheet intelligent screening device based on multi-stage vibration according to an embodiment of the present invention;

[0062] Figure 8 Schematic diagram B of the detailed structure of a cleaning mechanism of a mica sheet intelligent screening device based on multi-stage vibration according to an embodiment of the present invention;

[0063] Figure 9 This is an execution flow chart of a mica sheet intelligent screening system based on multi-stage vibration according to an embodiment of the present invention;

[0064] The reference numerals are as follows:

[0065] 1 is the driving motor, 2 is the feeding trough, 3 is the screening box, 4 is the baffle, 5 is the guide plate, 6 is the fixed slider, 7 is the flexible brush, 8 is the slide rail, 9 is the screen plate, 10 is the discharge port, 11 is the collecting trough, 12 is the swing assembly, 121 is the dial, 122 is the lever, 123 is the connecting seat, 124 is the optical axis, 125 is the connecting shaft, 126 is the guide column, 13 is the dustproof port, 14 is the transmission rod, 15 is the driving assembly, 16 is the servo motor, 17 is the central processing unit and control panel, 18 is the horizontal vibration device, and 19 is the weight sensor. DETAILED DESCRIPTION

[0066] To further illustrate the technical means and effects employed by the present invention to achieve its intended objectives, the following, in conjunction with the accompanying drawings and preferred embodiments, describes in detail the specific implementations, structures, features, and effects of the technical solutions proposed by the present invention. In the following description, references to "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics of one or more embodiments may be combined in any suitable manner.

[0067] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0068] One embodiment of the present invention provides a multi-stage vibration-based intelligent screening device for mica sheets. The screening device includes not only a screening device body (which serves as the basic screening equipment), but also advantageous feed and discharge mechanisms, a multi-stage screening mechanism, a cleaning mechanism, and a feedback adjustment mechanism, all of which are mounted on the screening device body. The feed and discharge mechanism is used to allow material to enter or exit the screening device, the multi-stage screening mechanism is used to screen materials of different particle sizes, the cleaning mechanism is used to clean material from the screen plate 9, and the feedback adjustment mechanism is used to adjust the vibration amplitude of the screening box 3 at each target level in real time.

[0069] The outer shell surface of the screening device in this embodiment is schematically shown. Figure 1 like Figure 1 As shown, the shell surface schematic Figure 2 like Figure 2 As shown, the internal structure Figure 1 like Figure 3 As shown, the internal structure is shown Figure 2 like Figure 4 As shown, the various mechanisms corresponding to the screening device include:

[0070] First, the feeding and discharging mechanism includes a feeding assembly, a discharging assembly and a collecting tank 11.

[0071] First, the feeding assembly is used to allow the material to enter the screening device, including the feeding trough 2 and the dustproof port 13. The detailed structural diagram C of the feeding assembly is as follows: Figure 5 shown.

[0072] The feed trough 2 is placed on the top of the screening device and can be connected to other automatic feeding equipment to achieve closed-loop automatic control.

[0073] Because the mica flakes have already been crushed, the mica flakes added through the feed chute 2 contain smaller particles, which may become dispersed during the screening process. Therefore, a dustproof port 13 is incorporated into the feed assembly. This port is located between the feed chute 2 and the screening device. When a certain amount of crushed mica flakes is added, the port moves horizontally, allowing the material to enter the screening device. After the material is added, the port moves horizontally. After a batch of material is added, the port closes to prevent the release of mica dust.

[0074] Secondly, the discharge assembly is used to discharge the material from the screening device, including a guide plate 5 and a discharge port 10. The detailed structural diagram D of the discharge assembly is as follows: Figure 6 shown.

[0075] The material guide plate 5 is connected to the external collecting mechanism and has a smooth surface, and is used to guide the material into the external collecting mechanism.

[0076] The discharge port 10 is located on one side of the screening box 3 at each level. The discharge port 10 is closed during the screening process. When the screen plate 9 needs to be cleaned after the screening is completed, the discharge port 10 is opened to discharge the large particles through the discharge port.

[0077] Finally, the collecting trough 11 is placed at the bottom of the screening device and above the servo motor 16. The collecting trough 11 is pushed and pulled in the horizontal direction to facilitate the staff to collect materials.

[0078] The collecting trough 11 is used to collect materials after multi-stage screening. Specifically, when the mica sheets pass through multi-stage screening, the materials with particle sizes larger than the corresponding apertures of the sieve plate 9 will remain in the corresponding screening box 3, and the materials with smaller particle sizes will fall into the collecting trough 11 after passing through three stages of screening.

[0079] It is worth noting that the feeding and discharging mechanism in this embodiment can effectively prevent particles with extremely small particle sizes from floating in the space during the screening process by adding a dustproof port 13, that is, reduce the emission of dust during the screening process.

[0080] Second, the multi-stage screening mechanism includes a drive motor 1 , a screening box 3 , a screen plate 9 , a swing assembly 12 , a transmission rod 14 , a drive assembly 15 , a servo motor 16 and a horizontal vibration device 18 .

[0081] It should be noted that after crushing, mica flakes form bulk particles of varying sizes. Passing only through a single-aperture sieve or sieve plate can easily result in the final screened particles being too large, leading to material waste and low efficiency throughout the screening process. Therefore, to avoid the aforementioned issues, the screening device of this embodiment includes three levels of screening, i.e., three screening boxes 3.

[0082] First, the driving motor 1 is connected to the swing assembly 12 , and the driving motor 1 provides power for the operation of the swing assembly 12 .

[0083] Secondly, for the screening box 3, the screening box located at the top of the screening device is a first-level screening box, the screening box located in the middle layer is a second-level screening box, and the screening box located at the bottom layer is a third-level screening box. In addition, the screening plate 9 is placed at the bottom of the screening box 3, the aperture of the screening plate 9 located at the top layer is larger than the aperture of the screening plate 9 located at the middle layer, and the aperture of the screening plate 9 located at the middle layer is larger than the aperture of the screening plate 9 located at the bottom layer.

[0084] Since the multi-stage screening assembly will block materials larger than the aperture of the screen plate 9, the materials will accumulate on the screen plate 9 and cause the screen plate to be blocked. For larger materials, their mass is large, and the displacement generated by horizontal vibration is small, especially when the materials themselves have different shapes after crushing, there are single large materials or multiple medium-sized materials stacked, which will cause the aperture of the screen plate 9 to be blocked. Common screening devices need to be manually disassembled and cleaned, which reduces the screening efficiency.

[0085] In this embodiment, for the first-level screening box 3, a large-scale swinging component is used to improve the pass rate and reduce the probability of blockage; for each level of screening box 3, each level of screening box 3 can be made to have a certain inclination angle, and the inclination angle can range from 5° to 10°, which can make the material more susceptible to vibration during the screening process and cause it to roll, thereby improving the screening efficiency and facilitating the subsequent collection and cleaning of materials on the surface of the screen plate 9.

[0086] The swing of the first-stage screening box 3 is realized specifically by the swing assembly 12, which is mounted on both sides of the first-stage screening box 3. The detailed structural diagram A of the swing assembly 12 is shown in FIG. Figure 7 As shown. The swing assembly 12 includes a dial 121, a lever 122, a connecting seat 123, an optical axis 124, a connecting shaft 125 and a guide column 126. The operation process of the swing assembly 12 includes:

[0087] The driving motor 1 provides power to make the dial 121 rotate counterclockwise. The dial 121 is connected to the dial rod 122 through the guide column 126, and drives the dial rod 122 to move up and down. The other end of the dial rod 122 is connected to the connecting seat 123 through the connecting shaft 125. The connecting seat 123 is fixed on one side of the screening box. The connecting shaft 125 is driven to rotate by the dial rod 122. When the dial rod 122 moves, the connecting seat 123 moves up and down along the optical axis 124; when the guide column 126 on the dial 121 rotates one circle, the connecting seat 123 moves back and forth along the optical axis 124 accordingly.

[0088] Similarly, identical swing assemblies 12 are installed on opposite sides of the first-stage screening box 3, resulting in a total of four swing assemblies. The two swing assemblies 12 located on the same side of the screening device have the same diameter of the dial 121, so that the relative position of the guide column 126 on the dial 121 is always at the farthest position in a straight line during movement. This allows the center position of the first-stage screening box 3 to remain at a fixed height, while the heights of the two sides change periodically. When the first-stage screening box 3 swings back and forth, the large-volume material on the screen plate 9 can be rolled back and forth to adjust the screening posture, while the small-volume material is directly screened and falls into the second-stage screening box 3.

[0089] For the second and third level screening boxes 3, on the basis of having a certain inclination angle, since the volume and mass of the materials staying on the screen plate 9 are relatively small, theoretically a larger amplitude vibration should be used to make the materials with smaller particle sizes pass through the gaps between the materials with larger particle sizes and be screened. However, the use of the above-mentioned swing component 12 will not be able to provide higher frequency vibration due to equipment loss problems.

[0090] Therefore, for the second and third level screening boxes 3, a horizontal vibration device 18 is installed on its side and fixed to the outside of the screening device through one side of the screening box to prevent it from falling. The horizontal vibration device 18 can generate horizontal vibrations of a certain frequency and amplitude, causing the second and third level screening boxes 3 to vibrate back and forth in the horizontal direction.

[0091] However, horizontal vibration has limited ability to adjust the posture of large and heavy materials.

[0092] Therefore, a servo motor 16 is installed at the bottom of the screening device, causing the drive assembly 15 to generate vertical vibrations, which are transmitted to the second and third level screening boxes 3 through the transmission rod 14. A shock-absorbing mechanism is installed at the connection between the drive assembly 15 and the screening device to reduce wear on the structural components. The drive assembly 15 can cause large volumes of material on the screening boxes 3 to roll, adjust their posture, and improve the material throughput rate.

[0093] The second and third level screening boxes 3 are respectively fixed by two sets of transmission rods 14 on opposite sides to transmit vibration; the second and third level screening boxes 3 are subjected to the same vertical vibration frequency and amplitude.

[0094] It is worth noting that the screening methods of the screening boxes at different levels in the multi-stage screening mechanism in this embodiment are different. For the screening boxes at the first level, a swing assembly is used to achieve material screening, while for the screening boxes at the second and third levels, a combination of inclination, horizontal vibration and vertical vibration is used. This can effectively improve the screening efficiency of the corresponding screen plates at each level, and to a certain extent overcome the existing defect of the single vibration mode.

[0095] Third, the cleaning mechanism includes a baffle 4, a fixed slider 6, a flexible brush 7 and a slide rail 8.

[0096] It should be noted that after a screening process, common screening devices usually need to be disassembled to clean the material on the screen plate. The manual disassembly and cleaning process takes a long time, which reduces the screening efficiency. Therefore, the screening device for screening mica sheet materials in this embodiment has a cleaning mechanism. The detailed structural diagram B of the cleaning mechanism is shown in FIG. Figure 8 shown.

[0097] The connection methods of the various components of the cleaning mechanism include: the baffle 4 is perpendicular to the screen plate 9 and is fixed by the fixed sliders 6 on both sides; a flexible brush 7 is installed at the bottom of the baffle 4; the inclination angle of the baffle 4 is adjusted by the connecting axis of the fixed slider 6; on each level of the screening box 3, a slide rail 8 parallel to the screen plate 9 is installed.

[0098] During the screening process, the fixed slider 6 is located at the end of the corresponding screening box 3, and the baffle 4 is in contact with the wall of the screening box.

[0099] When the screening is completed, the operation process of the cleaning mechanism includes: the fixed slider 6 drives the baffle 4 to move to the side with the discharge port 10, the baffle 4 is used to apply lateral force to move the material, and the flexible brush 7 cleans the material particles, assisting the material particles to be screened or pass through the discharge port 10; when the fixed slider 6 moves to the position of the discharge port 10, the fixed slider 6 moves to the end again for a second cleaning. During the movement, the baffle 4 rotates so that the plane of the baffle 4 is parallel to the screen plate 9, thereby avoiding moving the material in the opposite direction and improving the cleaning efficiency; when the baffle 4 reaches the end, it rotates and makes the plane of the baffle 4 perpendicular to the screen plate 9; at this time, the large volume of material on the current screen plate 9 is discharged through the guide plate 5, and the small volume of material accumulated between the large volume of material can fall and pass through the screen plate 9, thereby improving the screening efficiency.

[0100] It is worth noting that the cleaning mechanism in this embodiment can achieve the purpose of cleaning the material on the screen plate without disassembling the equipment, avoiding spending a long time in the cleaning process and improving the screening efficiency to a certain extent.

[0101] Third, the feedback adjustment mechanism. The feedback adjustment mechanism includes a weight sensor 19 installed at the end of each screen plate 9, a central processing unit and a control panel 17 located on one side of the screening device, and the signal output end of the weight sensor 19 is connected to the signal input end of the central processing unit and the control panel 17.

[0102] It should be noted that during multi-layer screening, the material can easily cause uneven force on the screen. Using vertical vibration can reduce material accumulation to a certain extent. Furthermore, as the screening process progresses, the amount of material remaining on the screen plates at each target level changes. Therefore, it is necessary to adjust the vibration amplitude corresponding to the screening boxes at different levels. Adjusting the amplitude of the screening boxes is equivalent to adjusting the vibration of the screen plates.

[0103] First, the weight sensor 19 is used to collect the material weight data of the screen plate 9 from the start time of the screening device to the current time.

[0104] Secondly, the central processing unit and control panel 17 are used to determine the actual weight of the material in the screening box 3 of each target level at each target moment based on the received material weight data of the screen plate 9 of each target level at each target moment, combined with the gravity coefficient and the vertical vibration frequency; wherein the target moment is the moment corresponding to the maximum point, and the target level is the second level or the third level; according to the actual weight of the material at each target moment, the vibration amplitude adjustment coefficient at the current moment is determined; the vibration amplitude adjustment coefficient is used to determine whether to adjust the vibration amplitude at the current moment, and if so, the vibration amplitude adjustment system is used to adjust the vibration amplitude at the current moment to obtain the vibration amplitude at the next moment of the current moment.

[0105] In this embodiment, the material weight data collected by the weight sensor 19 can be transmitted to the central processor and control panel 17 for analysis and processing via the Internet of Things, thereby achieving feedback adjustment. In addition, it should be noted that the central processor and control panel 17 can be operated by staff to implement various instructions.

[0106] The detailed implementation steps of the central processing unit and the control panel 17 for adjusting the vibration amplitude in the vertical direction of the screening box for each target level are consistent with the implementation steps of the processor in the following multi-stage vibration-based mica sheet intelligent screening system, that is, the processor of the mica sheet intelligent screening system is the central processing unit and the central processing unit in the control panel 17, and the same implementation steps will not be repeated here.

[0107] Since the weight data collected by the weight sensor is affected by the vibration of the screening box, its weight data is in a state of continuous fluctuation, which will interfere with the material content on each screen plate during the actual screening process. Based on the premise of inaccurate material weight data, the subsequent feedback control of vertical vibration is inaccurate.

[0108] Therefore, in order to improve the accuracy of regulating the vertical vibration amplitude, another embodiment of the present invention provides a mica sheet intelligent screening system based on multi-level vibration, including a memory and a processor, wherein the processor is used to process instructions stored in the memory, such as Figure 9As shown, to achieve the following process:

[0109] S1, from the start-up time of the screening device to the current time, obtain the material weight data of each target level of the sieve plate at each target time.

[0110] Here, the target moment is the moment corresponding to the maximum point, and the target level is the second level or the third level.

[0111] When the screening box is in a descending state during vertical vibration or the material on the surface of the screening box is in a falling state, the material itself is in a free fall state, and the weight data collected is zero for a certain period of time until the screening box's descending acceleration is less than the gravity coefficient and the weight data is collected again when it comes into contact with the material. When the screening box is in an ascending state during vertical vibration, it applies an upward thrust to the material, and the weight data collected at this time appears to increase first and then decrease. When the weight data collected at a certain moment is a maximum value, it means that at that corresponding moment, the weight sensor is affected by the gravity of the material and the maximum thrust generated during the ascending process of the screening box, resulting in the maximum force acting on it. Therefore, the weight of the material remaining in the screening box can be determined by analyzing the weight data of each ascending stage, that is, by analyzing the weight data at the corresponding moment of each maximum value point.

[0112] It should be noted that, since the vertical vibration frequency is fixed, the time intervals between the maximum points are the same.

[0113] In this embodiment, the motion trajectory labels of the corresponding weight sensors in different time periods can be assigned according to the motion trajectories of the second-level and third-level screening boxes, so as to determine the material weight data corresponding to each maximum point from the start-up moment of the screening device to the current moment.

[0114] S2, based on the material weight data at each target moment, combined with the gravity coefficient and the vertical vibration frequency, determines the actual weight of the material in the screening box of each target level at each target moment.

[0115] Here, material weight data refers to the weight data directly collected by the weight sensor and is affected by gravity and acceleration. The actual material weight refers to the weight on the sieve deck of the target-level screening box, which is affected only by the actual material weight. To improve the accuracy of vertical vibration amplitude adjustment based on material weight, it is necessary to combine the gravity coefficient and vertical vibration frequency to determine the actual material weight of each target-level screening box at each target time.

[0116] As an exemplary embodiment, the above step S2 can be implemented through steps S21 to S22:

[0117] S21, for any target level of the screening box and any target time, taking the vertical vibration frequency as the acceleration of the screening box.

[0118] S22, calculating the value obtained by adding the acceleration and the gravity coefficient; and taking the ratio of the material weight data at the target moment to the added value as the actual weight of the material at the target moment.

[0119] In this embodiment, according to the laws of physics, there is an expression for weight data as follows:

[0120] ; In the formula, F represents the material weight data at the target time, a represents the acceleration of the screening box, g represents the gravity coefficient, and m represents the actual weight of the material at the target time.

[0121] The frequency of vertical vibration is known and can be used as the acceleration of the screening box. g is a known parameter and F is the measured weight data. , we can get the actual weight m of the material in the current level screening box at the target time.

[0122] With reference to the above-mentioned process of determining the actual weight of the material of the screening box of any target level at any target time, the actual weight of the material of the screening box of each target level at each target time can be obtained.

[0123] It is worth noting that the actual material weight determined at this time does not take into account the effects of gravity and acceleration. Gravity and acceleration will affect the actual material weight. If these factors are not eliminated, the measured weight may be affected by external forces, resulting in errors. The vertical vibration amplitude of the screen plate is adjusted to optimize the screening effect. If the vibration amplitude adjustment is affected by gravity and acceleration, it may lead to unstable or inconsistent vibration amplitude measurement, thereby affecting screening efficiency. The material is affected by vibration during the screening process. Accurate weight data can reflect the characteristics of the material, such as particle size and density.

[0124] Therefore, by eliminating the influence of external factors such as gravity and acceleration, the actual weight data obtained is purer, can accurately reflect the true condition of the material, and help make more scientific and reasonable adjustments during the screening process, which is helpful to subsequently obtain a vibration amplitude adjustment coefficient with higher numerical accuracy.

[0125] S3, determining the vibration amplitude adjustment coefficient at the current moment according to the actual weight of the material at each target moment.

[0126] During the vertical vibration screening process, there is a certain probability that the material that could have passed through will remain on the screen plate. At this time, if the vertical vibration amplitude is directly adjusted according to the actual weight of the material at the current moment, the determined vibration error will be large, which will reduce the screening efficiency of the screening box.

[0127] As an exemplary embodiment, the above step S3 can be implemented through steps S31 to S35:

[0128] S31 , for the screening box of the current level, obtain a preset number of target moments adjacent to the current moment, and form the current time period with each target moment adjacent to the current moment.

[0129] In this embodiment, as screening proceeds, the total amount of material larger than the corresponding aperture retained between each sieve plate tends to balance, and the fluctuation in the obtained material quality gradually decreases. Therefore, for the current moment of real-time collection, the actual weight of the material at the moments corresponding to the preset number of maximum points adjacent to the current moment is obtained, specifically, the actual weight of the material at the historical 10 target moments adjacent to the current moment is obtained.

[0130] The preset number may be set to 10, but the implementer may set the size of the preset number according to the actual situation, and no specific limitation is made here.

[0131] S32, based on the actual weight of the material at each target moment in the current period, analyzing the actual weight difference between adjacent target moments, and determining the adjustment requirement index for the vertical vibration of the current level screening box at the current moment.

[0132] Here, the adjustment demand index refers to the demand for vibration amplitude adjustment of the material screening status of the current level screening box. The larger the adjustment demand index, the worse the material screening status of the current level screening box, and the greater the degree of vibration amplitude adjustment.

[0133] As an exemplary implementation, the above step S32 can be implemented through steps S321 to S322:

[0134] S321, calculating the actual weight difference of the materials between the previous target moment and the next target moment in the current time period, and obtaining the actual weight difference of each material.

[0135] In this embodiment, the previous target moment is an earlier time point, and the next target moment is a later time point. Here, the actual weight of the material at the previous target moment is used as the minuend in order to analyze the change in the weight of the material on the screen plate as time goes by.

[0136] S322, determining the average value and variance value of all actual weight differences of the materials, and determining the adjustment requirement index of the vertical vibration of the current level screening box at the current moment based on the average value and variance value.

[0137] The larger the variance of the actual weight difference of the material in the current period, the higher the degree of unstable falling of the material in the current period, which further indicates that there are still many small-volume materials that have not passed through the screening box at the current level. The more unstable the weight change is, the higher the need for adjusting the vibration amplitude.

[0138] The average value of the actual weight difference of the material in the current time period can be positive or negative. When the average value is positive, it means that the material in the current level screening box in the current time period is in a decreasing state. The larger the average value, the more the material weight monitored by the weight sensor of the current level screening box in the current time period can show a decreasing trend, the less necessary it is to adjust the amplitude of the vertical vibration of the current level screening box at the current moment, and the smaller the adjustment demand index; the smaller the average value, the material weight monitored by the weight sensor of the current level screening box in the current time period has not changed significantly, and blockage may occur. At this time, the more necessary it is to adjust the amplitude of the vertical vibration of the current level screening box at the current moment, and the larger the adjustment demand index.

[0139] When the average value is negative, it means that the material in the screening box of the current level in the current period is in an increasing state. The larger the absolute value of the average value is, the more obvious the increasing trend of the material weight monitored by the weight sensor of the screening box of the current level in the current period is, the more likely the screen plate is to be blocked, the greater the necessity of adjusting the amplitude of the vertical vibration of the screening box of the current level at the current moment is, and the greater the adjustment demand index is; on the contrary, the smaller the absolute value of the average value is, the less obvious the increasing trend of the material weight monitored by the weight sensor of the screening box of the current level in the current period is, the less necessary the amplitude of the vertical vibration of the screening box of the current level at the current moment is, and the smaller the adjustment demand index is.

[0140] In this embodiment, by combining two calculation factors related to the vertical vibration adjustment demand to determine the adjustment demand index, the numerical accuracy of the adjustment demand index can be effectively improved.

[0141] As an example, the calculation formula for the adjustment requirement index of the vertical vibration of the screening box of the i-th target level at the current moment can be:

[0142] Where, It represents the adjustment requirement index of the vertical vibration of the screening box of the i-th target level at the current moment, It represents the average value of the actual weight difference of all materials in the screening box of the target level i in the current period. It represents the variance of the actual weight difference of all materials in the screening box of the i-th target level in the current period.

[0143] It should be noted that and The related operations do not consider the dimension effect, and only the numerical value can be used for analysis. In addition, due to the continuous influence of the screening process, in general There is no zero possibility. When there is an extreme case, Assign a non-zero constant, such as 0.01.

[0144] The second and third level screening boxes are affected by the same frequency and amplitude vibrations. However, the sieve plate apertures corresponding to the different levels of screening boxes are different, and the proportion of the different volumes of mica flakes contained in different batches added to the screening varies. The material proportion cannot be directly obtained. Therefore, if the amplitude is adjusted based solely on the adjustment requirement index for the vertical vibration, it is likely to lead to a decrease in the material pass rate in the third level screening box, resulting in a decrease in overall screening efficiency. Therefore, this embodiment proposes the following steps S33 to S34.

[0145] S33, obtaining the sieve plate aperture value of the current level screening box, and determining the simulated volume of the material passing through the current level screening box according to the sieve plate aperture value.

[0146] During vertical screening, the smaller the sieve plate aperture, the smaller the required vibration amplitude. Therefore, for each target level of screening box, the sieve plate aperture value of the current level of screening box is obtained, and the material simulation volume can be determined based on the sieve plate aperture value.

[0147] In this embodiment, since the actual mica sheet material is a polygon, the cube of the sieve plate aperture value can be obtained to simulate the maximum passing volume of the material as the simulated volume of the passing material.

[0148] S34, determining the screening efficiency index of the current level screening box at the current moment according to the simulated volume of the passed material and the actual weight of the material in the current level screening box at the current moment.

[0149] The greater the mass of the material in the screening box of the current level, the greater the real-time screening efficiency of the corresponding screening box. Therefore, when quantitatively analyzing the screening efficiency index, it is necessary to combine the actual weight of the material in the screening box of the current level at the current moment.

[0150] As an example, the calculation formula for the screening efficiency index of the screening box of the i-th target level at the current moment can be:

[0151] Where, It represents the screening efficiency index of the screening box of the i-th target level at the current moment, Indicates the sieve plate aperture value of the sieve box at the i-th target level, Indicates the simulated volume of the material passing through the screening box of the i-th target level, Indicates the actual weight of the material in the screening box of the i-th target level at the current moment, The material weight data does not consider the influence of gravity and acceleration.

[0152] In the calculation formula of the screening efficiency index, the smaller the simulated volume of the material passing through, the higher the material passing rate of the screening box at the current level, and the better the screening effect of the screening box. Therefore, the simulated volume of the material passing through is negatively correlated with the screening efficiency index; the greater the actual weight of the material, the more material that needs to be screened by the screening box at the current level, and the higher the screening efficiency of the screening box; on the basis of a smaller screening volume, the more material on the screening box at the current level, the higher the screening efficiency of the screening box at the current level. and The multiplication operation does not consider the dimension effect, and only the numerical value can be used for analysis.

[0153] S35 , determining the vibration amplitude adjustment coefficient at the current moment by combining the adjustment demand index and the screening efficiency index corresponding to each target level screening box at the current moment.

[0154] In this embodiment, the higher the adjustment demand index corresponding to the screening box at the current moment, the greater the possibility that the screening box corresponding to the target level will adjust the vertical vibration amplitude, and the higher the screening efficiency index corresponding to the screening box at the current moment, the less likely it is that the screening box corresponding to the target level will adjust the vertical vibration amplitude. The adjustment demand index and the screening efficiency index are both dimensionless indicators used to determine the vibration amplitude adjustment coefficient at the current moment.

[0155] As an example, the calculation formula for the vibration amplitude adjustment coefficient at the current moment can be:

[0156] Where, Indicates the vibration amplitude adjustment coefficient at the current moment, n indicates the number of target levels, It represents the adjustment requirement index of the vertical vibration of the screening box of the i-th target level at the current moment, It represents the screening efficiency index of the screening box of the i-th target level at the current moment, and norm represents the normalization function, which is used to realize the The normalization processing is performed so that the value range of the vibration amplitude adjustment coefficient is limited to between 0 and 1.

[0157] S4, using the vibration amplitude adjustment coefficient to determine whether to adjust the vibration amplitude at the current moment.

[0158] During the screening process, there is a certain probability that the material will stay in the screening box corresponding to a certain target level. If the amplitude is adjusted continuously, it will easily lead to increased equipment wear and shortened equipment life. Therefore, after obtaining the current vibration amplitude adjustment coefficient, it is determined based on the vibration amplitude adjustment coefficient whether to adjust the current vibration amplitude.

[0159] Specifically, the vibration amplitude adjustment system is determined as the adjustment judgment index, and an adjustment judgment threshold is set; if the adjustment judgment index at the current moment is greater than the adjustment judgment threshold, the vibration amplitude at the current moment is adjusted; if the adjustment judgment index at the current moment is less than or equal to the adjustment judgment threshold, the vibration amplitude at the current moment is not adjusted.

[0160] In this embodiment, the adjustment determination threshold is set to 0.5. When it is greater than 0.5, the vibration amplitude at the current moment is adjusted as the vibration amplitude at the next moment. When it is less than or equal to 0.5, the vibration amplitude at the current moment is not adjusted, and the vibration amplitude at the next moment remains unchanged from the vibration amplitude at the current moment.

[0161] S5, if adjustment is required, the vibration amplitude adjustment system is used to adjust the vibration amplitude at the current moment to obtain the vibration amplitude at the next moment after the current moment.

[0162] In this embodiment, in the process of adjusting the vibration amplitude at the current moment, the adjustment is performed according to a linear formula, thereby obtaining the vibration amplitude at the next moment after the current moment, specifically:

[0163] when hour, It represents the average value of the actual weight difference of all materials in the screening boxes of all target levels in the current period. It means that the weight of materials in the screening boxes of each target level in the current period is decreasing. The vibration amplitude at the current moment should be reduced. The expression of the vibration amplitude at the next moment is: Where, Indicates the vibration amplitude at the next moment from the current moment, Indicates the vibration amplitude at the current moment, Indicates the vibration amplitude adjustment coefficient at the current moment.

[0164] when , it indicates that the material weight of the screening boxes at each target level in the current period is increasing. The vibration amplitude at the current moment should be increased. The expression of the vibration amplitude at the next moment is: .

[0165] It is worth noting that when the vibration amplitude adjustment indicator approaches 0 at the current moment, it indicates that the screening boxes of each target level have completed the screening process and the weight has stabilized. Therefore, if the adjustment indicator remains at zero for a rated period of 30 seconds, the entire screening device is shut down, and the material in the screening boxes of each level is cleaned and collected, thus completing the mica sheet screening process. After cleaning is completed, the dustproof port is opened and the next batch of material is added for screening.

[0166] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A mica sheet intelligent screening device based on multi-stage vibration, the screening device comprising a screening device body, characterized in that: The screening device further includes an inlet and outlet mechanism, a multi-stage screening mechanism, a cleaning mechanism and a feedback adjustment mechanism, each of which is installed on the screening device body, the inlet and outlet mechanism allows materials to enter or discharge the screening device, the multi-stage screening mechanism is used to screen materials of different particle sizes, the cleaning mechanism is used to clean materials on the screen plate, and the feedback adjustment mechanism is used to adjust the vibration amplitude of the screening boxes of each target level in real time; wherein, the screening box located at the topmost layer of the screening device is a screening box of the first level, the screening box located at the middle layer is a screening box of the second level, and the screening box located at the bottom layer is a screening box of the third level; the screen plate is placed at the bottom of the screening box, the aperture of the screen plate located at the upper layer is larger than the aperture of the screen plate located at the middle layer, and the aperture of the screen plate located at the middle layer is larger than the aperture of the screen plate located at the lower layer; The feedback adjustment mechanism includes a weight sensor installed at the end of each screen plate, a central processing unit and a control panel located on one side of the screening device, and the signal output end of the weight sensor is connected to the signal input end of the central processing unit and the control panel; The weight sensor is used to collect the material weight data of the screen plate from the start-up time of the screening device to the current time; the central processing unit and the control panel are used to determine the actual weight of the material in the screening box of each target level at each target time based on the received material weight data of the screen plate of each target level at each target time, combined with the gravity coefficient and the vertical vibration frequency; wherein, the target time is the time corresponding to the maximum point, and the target level is the second level or the third level; according to the actual weight of the material at each target time, the vibration amplitude adjustment coefficient at the current time is determined; the vibration amplitude adjustment coefficient is used to determine whether to adjust the vibration amplitude at the current time, and if so, the vibration amplitude adjustment coefficient is used to adjust the vibration amplitude at the current time to obtain the vibration amplitude at the next moment after the current time; The step of determining the vibration amplitude adjustment coefficient at the current moment according to the actual weight of the material at each target moment includes: For the screening box of the current level, a preset number of target moments adjacent to the current moment are obtained, and each target moment adjacent to the current moment constitutes the current time period; According to the actual weight of the material at each target moment in the current period, the actual weight difference between adjacent target moments is analyzed to determine the adjustment requirement index of the vertical vibration of the current level screening box at the current moment; Obtaining the sieve plate aperture value of the current level screening box, and determining the simulated volume of the material passing through the current level screening box according to the sieve plate aperture value; Determine the screening efficiency index of the current level screening box at the current moment based on the simulated volume of the passed material and the actual weight of the material in the current level screening box at the current moment; The vibration amplitude adjustment coefficient at the current moment is determined by combining the adjustment demand index and the screening efficiency index corresponding to the screening box of each target level at the current moment.

2. The intelligent screening device for mica sheets based on multi-stage vibration according to claim 1 is characterized in that: The feeding and discharging mechanism includes a feeding component, a discharging component and a collecting tank; The feed assembly is used to allow materials to enter the screening device, and the feed assembly includes a feed trough and a dustproof port; the feed trough is placed at the top of the screening device, and the dustproof port is located between the feed trough and the screening device. After a batch of materials is added, the dustproof port is closed to prevent the mica flake dust from being dispersed; The discharging assembly is used to discharge the material from the screening device, and the discharging assembly includes a material guide plate and a material outlet; the material guide plate is connected to the external collection mechanism, and the material guide plate is used to guide the material into the external collection mechanism; the material outlet is located on one side of the screening box of each level, and is in a closed state during the screening process. When the screening is completed and the screen plate needs to be cleaned, the material outlet is opened; The collecting trough is placed at the bottom of the screening device and above the servo motor. The collecting trough moves in a push-pull manner in the horizontal direction and is used to collect materials after passing through multi-stage screening.

3. The intelligent screening device for mica sheets based on multi-stage vibration according to claim 1 is characterized in that: The multi-stage screening mechanism includes a drive motor, a screening box, a screen plate, a swing assembly, a transmission rod, a drive assembly, a servo motor and a horizontal vibration device; The driving motor is connected to the swing assembly, and the driving motor provides power for the operation of the swing assembly; The sieve plate is placed at the bottom of the sieving box, the pore size of the sieve plate at the upper layer is larger than the pore size of the sieve plate at the middle layer, and the pore size of the sieve plate at the middle layer is larger than the pore size of the sieve plate at the lower layer; The screening box located at each layer of the screening device has a set inclination angle to prevent material from piling up; The swing assembly is used to swing the screening box on the upper layer, and the swing assembly is installed on both sides of the screening box on the upper layer; The horizontal vibration device is placed on the side of the screening box in the middle and lower layers, and is used to generate horizontal vibration with a set frequency and amplitude, so that the screening box vibrates back and forth in the horizontal direction; The servo motor is installed at the bottom of the screening device to make the driving assembly generate vertical vibration, which is transmitted to the screening box through the transmission rod; For the screening boxes in the middle and lower layers, the transmission rods located on the opposite sides are responsible for transmitting vibration and fixing them respectively; The vertical vibration frequency and amplitude to which the screening boxes in the middle layer and the lower layer are subjected are consistent.

4. The intelligent screening device for mica sheets based on multi-stage vibration according to claim 3 is characterized in that: The swing assembly includes a dial, a lever, a connecting seat, an optical axis, a connecting axis and a guide column; the operation process of the swing assembly includes: The driving motor provides power to make the dial rotate counterclockwise, and the dial is connected to the lever through the guide column, and drives the lever to move up and down. The other end of the lever is connected to the connecting seat through a connecting shaft. The connecting seat is fixed on one side of the screening box. The connecting shaft is driven to rotate by the lever. When the lever moves, the connecting seat moves up and down along the optical axis; when the guide column on the dial rotates one circle, the connecting seat moves back and forth along the optical axis accordingly. The dials of the two sets of swing assemblies on the same side of the screening device have the same diameter, so that the relative position of the guide column on the dial is always at the farthest position in a straight line during the movement, so that the center position of the screening box on the upper layer is maintained at a fixed height, while the heights on both sides change periodically.

5. The intelligent screening device for mica sheets based on multi-stage vibration according to claim 1 is characterized in that: The cleaning mechanism includes a baffle, a fixed slider, a flexible brush, and a slide rail; the baffle is perpendicular to the screen plate and is fixed by the fixed sliders on both sides; the flexible brush is installed at the bottom of the baffle; the inclination angle of the baffle is adjusted by the connecting shaft of the fixed slider; the slide rail parallel to the screen plate is installed on each level of the screening box; During the screening process, the fixed slider is located at the end corresponding to the screening box, and the baffle is in contact with the wall of the screening box; When the screening is completed, the operation process of the cleaning mechanism includes: the fixed slider drives the baffle to move toward the side with the discharge port, the baffle is used to apply lateral force to move the material, and the flexible brush cleans the material particles, assisting the material particles to be screened or pass through the discharge port; when the fixed slider moves to the discharge port position, the fixed slider moves to the end for a second cleaning, and the baffle is parallel to the screen plate during the movement; when the baffle reaches the end, it rotates and makes the plane where the baffle is located perpendicular to the screen plate.

6. A mica sheet intelligent screening system based on multi-stage vibration, applied to the screening device according to claim 1, characterized in that: The system comprises a memory and a processor, wherein the processor is configured to process instructions stored in the memory to implement the following process: From the moment the screening device is started to the current moment, the material weight data of the sieve plate of each target level at each target moment is obtained; wherein the target moment is the moment corresponding to the maximum point; the target level is the second level or the third level; According to the material weight data at each target moment, combined with the gravity coefficient and vertical vibration frequency, the actual weight of the material in the screening box of each target level at each target moment is determined; Determining the vibration amplitude adjustment coefficient at the current moment according to the actual weight of the material at each target moment; Using the vibration amplitude adjustment coefficient to determine whether to adjust the vibration amplitude at the current moment; If adjustment is required, the vibration amplitude at the current moment is adjusted using the vibration amplitude adjustment coefficient to obtain the vibration amplitude at the next moment after the current moment; The step of determining the vibration amplitude adjustment coefficient at the current moment according to the actual weight of the material at each target moment includes: For the screening box of the current level, a preset number of target moments adjacent to the current moment are obtained, and each target moment adjacent to the current moment constitutes the current time period; According to the actual weight of the material at each target moment in the current period, the actual weight difference between adjacent target moments is analyzed to determine the adjustment requirement index of the vertical vibration of the current level screening box at the current moment; Obtaining the sieve plate aperture value of the current level screening box, and determining the simulated volume of the material passing through the current level screening box according to the sieve plate aperture value; Determine the screening efficiency index of the current level screening box at the current moment based on the simulated volume of the passed material and the actual weight of the material in the current level screening box at the current moment; The vibration amplitude adjustment coefficient at the current moment is determined by combining the adjustment demand index and the screening efficiency index corresponding to the screening box of each target level at the current moment.

7. The multi-stage vibration-based intelligent screening system for mica sheets according to claim 6 is characterized in that: The method of determining the actual weight of the material at each target level of the screening box at each target time based on the material weight data at each target time, combined with the gravity coefficient and the vertical vibration frequency, includes: For any target level of the screening box and any target time, the vertical vibration frequency is used as the acceleration of the screening box; Calculate the value of the acceleration plus the gravity coefficient; and use the ratio of the material weight data at the target moment to the added value as the actual weight of the material at the target moment.

8. The multi-stage vibration-based intelligent screening system for mica sheets according to claim 6 is characterized in that: The method of analyzing the actual weight difference between adjacent target moments based on the actual weight of the material at each target moment in the current period and determining the adjustment requirement index of the vertical vibration of the current level screening box at the current moment includes: Calculate the actual weight difference of the materials between the previous target time and the next target time in the current period to obtain the actual weight difference of each material; Determine the average value and variance value of all actual weight differences of the materials, and determine the adjustment requirement index of the vertical vibration of the current level screening box at the current moment according to the average value and variance value.

9. The intelligent mica sheet screening system based on multi-stage vibration according to claim 6, characterized in that: Determining whether to adjust the vibration amplitude at the current moment using the vibration amplitude adjustment coefficient includes: Determining the vibration amplitude adjustment coefficient as an adjustment determination index and setting an adjustment determination threshold; If the adjustment determination index at the current moment is greater than the adjustment determination threshold, the vibration amplitude at the current moment is adjusted; if the adjustment determination index at the current moment is less than or equal to the adjustment determination threshold, the vibration amplitude at the current moment is not adjusted.

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