A method for detecting sieve hole blockage and a particle size screening device

Abstract

The present invention relates to the technical field of particle size control of granular raw materials, and specifically to a method for detecting the blockage condition of sieve holes and a particle size screening device. The method for detecting the blockage condition of sieve holes comprises: providing a pressure sensor and a detection needle, with an elastic member provided between the detection needle and the pressure sensor; when the sieve hole is not blocked, controlling the pressure sensor to move a preset distance toward the sieve hole, and using the "pressure-time" data detected by the pressure sensor during this process as standard data; during detection, controlling the pressure sensor to move a preset distance toward the sieve hole, and collecting the "pressure-time" data detected by the pressure sensor during this process as pressure change data; if at the same time point, the corresponding pressure in the pressure change data is greater than the corresponding pressure in the standard data, then it is determined that the sieve hole is blocked. It can conveniently and sensitively detect the blockage condition of the sieve hole, help determine whether the sieve hole is in the best working state, and thus ensure the smooth progress of the screening work.

Description

Technical Field

[0001] The present invention relates to the technical field of particle size control of granular raw materials, and in particular to a method for detecting sieve hole blockage conditions and a particle size screening device. Background Art

[0002] In production activities that require the use of granular raw materials, the granular raw materials are prone to produce smaller particles or debris after a long period of transportation, which will directly affect the particle size uniformity and particle size range of the granular raw materials. Before use, these smaller particles or debris need to be separated.

[0003] Existing technologies often suffer from insufficient separation in a single pass. To ensure adequate separation, repeated separation operations are often required, significantly slowing production efficiency. Furthermore, in actual operations, the problem of insufficient separation of particles or debris often arises, even after repeated separations.

[0004] In view of this, this application is hereby filed. Summary of the Invention

[0005] The first purpose of the present invention is to provide a method for detecting the blockage condition of the sieve holes, which can conveniently and sensitively detect the blockage condition of the sieve holes, help determine whether the sieve holes are in the best working state, and thus ensure the smooth progress of the screening work.

[0006] The second object of the present invention is to provide a particle size screening device, which can effectively improve the separation efficiency of smaller particles and debris in granular raw materials, maintain the continuous stability of the separation effect, and has positive significance for improving the particle size uniformity of granular raw materials.

[0007] The embodiment of the present invention is achieved as follows:

[0008] A method for detecting sieve hole blockage comprises the following steps:

[0009] S1. Set a pressure sensor and a detection needle. The tip of the detection needle is used to insert into the sieve hole. An elastic member is set between the detection needle and the pressure sensor.

[0010] S2. Collect standard data. The standard data is obtained in the following way: when the sieve hole is not blocked, control the pressure sensor to move a preset distance toward the sieve hole so that the detection needle moves into the sieve hole, and use the "pressure-time" data detected by the pressure sensor in this process as standard data.

[0011] S3. During detection, the pressure sensor is controlled to move a preset distance toward the sieve hole, and the “pressure-time” data detected by the pressure sensor during this process is collected as pressure change data.

[0012] S4. Compare the pressure change data with the standard data. If, at the same time point, the corresponding pressure in the pressure change data is greater than the corresponding pressure in the standard data, it is determined that the sieve hole is clogged.

[0013] Furthermore, the sieve hole blockage detection method further includes the following steps:

[0014] S5. If it is determined in S4 that there is blockage, and the pressure corresponding to the last time point in the pressure change data is greater than the pressure corresponding to the last time point in the standard data, it is determined that the sieve hole is blocked.

[0015] Furthermore, the sieve hole blockage detection method further includes the following steps:

[0016] S6. If it is determined in S4 that there is blockage, and the pressure corresponding to the last time point in the pressure change data is equal to the pressure corresponding to the last time point in the standard data, it is determined that the sieve hole has been unblocked.

[0017] Furthermore, the sieve hole blockage detection method further includes the following steps:

[0018] S7. Determine the earliest time point in the pressure change data where "the pressure corresponding to the pressure change data is greater than the pressure corresponding to the standard data at the same time point" and record this as the abnormal time point. The earlier the abnormal time point, the larger the flow area of the sieve hole that is blocked.

[0019] A particle size screening device comprises a frame, a roller, a control arm, a reference column, a detection needle and a control end.

[0020] The drum is rotatably mounted on the frame and driven by a first driver. A sieve hole is formed on the side wall of the drum. One end of the drum is a feed end, and the other end is a discharge end. In the height direction, the feed end is higher than the discharge end.

[0021] The control arm is arranged along the axial direction of the roller and spaced apart from the roller. The reference column is fixedly installed on the control arm and arranged along the radial direction of the roller.

[0022] The reference post has an inner cavity extending along its length. A sliding member slidably engages within the inner cavity, and a pressure sensor is disposed on an end wall of the inner cavity distal to the roller. An elastic member abuts the sliding member against the pressure sensor, ensuring that, in a natural state, the sliding member adheres to the end wall of the inner cavity proximal to the roller.

[0023] A connecting rod is fixedly connected to the side of the sliding member closest to the roller. The connecting rod passes through the end wall of the reference column and extends beyond the reference column. A detection needle is arranged along the length of the reference column and fixedly connected to the end of the connecting rod away from the sliding member, with the tip of the detection needle facing the roller.

[0024] The outer diameter of the detection needle decreases in a direction from the end of the detection needle away from the roller to the tip thereof, and the maximum outer diameter of the detection needle is larger than the aperture of the sieve hole.

[0025] The control arm is driven by the second driver so that the control arm can move close to and away from the drum in the radial direction of the drum.

[0026] The first driver, second driver, and pressure sensor are all electrically connected to a control terminal. The control terminal is configured to control the second driver to drive the control arm toward the roller when the sieve aperture moves toward the detection needle, thereby inserting the detection needle into the sieve aperture. The control terminal is also configured to execute the aforementioned sieve aperture blockage detection method to determine the sieve aperture blockage status.

[0027] Furthermore, a first baffle is provided at the discharge end, which is arranged perpendicular to the central axis of the drum. The first baffle is rotatably engaged with the discharge end and is driven by a third driver, and the periphery of the first baffle is in contact with the inner wall of the drum.

[0028] The first baffle is provided with a discharge notch, which extends from the periphery of the first baffle to the middle thereof.

[0029] Furthermore, a second baffle is provided at the feed end, the second baffle is provided perpendicular to the central axis of the drum, the second baffle is fixedly fitted to the feed end, and the periphery of the second baffle is in contact with the inner wall of the drum.

[0030] The second baffle is equipped with a feed pipe, which is coaxially arranged with the roller. The feed pipe passes through the second baffle and is rotatably matched with the second baffle.

[0031] The beneficial effects of the technical solutions of the embodiments of the present invention include:

[0032] The sieve hole blockage detection method provided by the embodiments of the present invention can detect and analyze the actual condition of the sieve holes, thereby helping to monitor the stability of the sieve hole's screening capacity in real time. If a large number of sieve holes are found to be blocked, significantly affecting screening efficiency, the sieve holes can be uniformly cleared and treated to ensure the efficiency and quality of the screening work.

[0033] In general, the sieve hole blockage condition detection method provided in the embodiment of the present invention can conveniently and sensitively detect the blockage condition of the sieve hole, help determine whether the sieve hole is in the best working state, and thus ensure the smooth progress of the screening work.

[0034] The particle size screening device provided by the embodiments of the present invention can detect and analyze the actual conditions of the drum, thereby helping to monitor the stability of the drum's screening capacity in real time. If a large number of screen holes are found to be clogged, significantly affecting screening efficiency, the screen holes of the drum can be uniformly cleared and treated to ensure the efficiency and quality of the screening work.

[0035] In general, the particle size screening device provided in the embodiment of the present invention can effectively improve the separation efficiency of smaller particles and debris in the granular raw materials, maintain the continuous stability of the separation effect, and has positive significance for improving the particle size uniformity of the granular raw materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0037] Figure 1 A schematic diagram of the coordination relationship between the pressure sensor and the detection needle in the sieve hole blockage detection method provided by an embodiment of the present invention;

[0038] Figure 2 A schematic structural diagram of a particle size screening device provided by an embodiment of the present invention from the perspective of the drum end;

[0039] Figure 3 A schematic diagram of the structure of a particle size screening device provided by an embodiment of the present invention when viewed from the side;

[0040] Figure 4 This is a schematic diagram of the structure when the control arm is away from the drum;

[0041] Figure 5 This is a schematic diagram of the structure when the control arm is close to the drum;

[0042] Figure 6 This is a structural diagram when the discharge notch is at the lowest position;

[0043] Figure 7 It is a structural diagram when the discharge gap is located between the lowest position and the highest position;

[0044] Figure 8 This is a structural diagram when the discharge notch is at the highest position.

[0045] Description of reference numerals:

[0046] Roller 100; feed end 110; discharge end 120; control arm 200; reference column 300; inner cavity 310; sliding member 320; pressure sensor 330; elastic member 340; connecting rod 350; detection needle 400; tip 410; first baffle 500; discharge notch 510; second baffle 600; feed pipe 610; outer shell 700; drop opening 710; clearance hole 720. DETAILED DESCRIPTION

[0047] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0048] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0049] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0050] The terms "first", "second", "third", etc. are only used for distinction and description and should not be understood as indicating or implying relative importance.

[0051] Furthermore, the terms "parallel" and "perpendicular" do not necessarily mean that the components must be absolutely parallel or perpendicular, but rather that they can be slightly tilted. For example, "parallel" simply means that the direction is more parallel than "perpendicular," not that the structure must be completely parallel, but rather that it can be slightly tilted.

[0052] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0053] The inventors of this application have discovered that, in actual operations, the problem of insufficient separation of particles or debris, even after repeated separations, often occurs. This is usually caused by the sieve holes of the sieve plate becoming partially or completely blocked during the separation process. To ensure adequate separation, the sieve plate must be frequently cleaned, which significantly increases the burden and further reduces production efficiency.

[0054] In order to overcome the defects in the prior art, this embodiment provides a method for detecting sieve hole blockage, which includes the following steps:

[0055] S1. Set up a pressure sensor 330 and a detection needle 400. The tip 410 of the detection needle 400 is used to insert into the sieve hole. An elastic member 340 is set between the detection needle 400 and the pressure sensor 330. Figure 1 shown.

[0056] S2. Collect standard data. The standard data is obtained in the following manner: when the sieve hole is not blocked, control the pressure sensor 330 to move a preset distance toward the sieve hole so that the detection needle 400 moves into the sieve hole, and use the "pressure-time" data detected by the pressure sensor 330 during this process as standard data.

[0057] S3. During detection, the pressure sensor 330 is controlled to move toward the sieve hole by a preset distance, and the “pressure-time” data detected by the pressure sensor 330 during this process is collected as pressure change data.

[0058] S4. Compare the pressure change data with the standard data. If, at the same time point, the corresponding pressure in the pressure change data is greater than the corresponding pressure in the standard data, it is determined that the sieve hole is clogged.

[0059] Furthermore, the sieve hole blockage detection method further includes the following steps:

[0060] S5. If it is determined in S4 that there is blockage, and the pressure corresponding to the last time point in the pressure change data is greater than the pressure corresponding to the last time point in the standard data, it is determined that the sieve hole is blocked.

[0061] S6. If it is determined in S4 that there is blockage, and the pressure corresponding to the last time point in the pressure change data is equal to the pressure corresponding to the last time point in the standard data, it is determined that the sieve hole has been unblocked.

[0062] S7. Determine the earliest time point in the pressure change data where "the pressure corresponding to the pressure change data is greater than the pressure corresponding to the standard data at the same time point" and record this as the abnormal time point. The earlier the abnormal time point, the larger the flow area of the sieve hole that is blocked.

[0063] It should be noted that if the sieve hole is partially or completely blocked, the detection needle 400 will be obstructed when inserted into the sieve hole, resulting in the actual insertion depth of the detection needle 400 being less than the depth when the sieve hole is not blocked. Since the insertion of the detection needle 400 is somewhat obstructed, this brings the detection needle 400 closer to the pressure sensor 330, thus further compressing the elastic member 340 and causing the pressure detected by the pressure sensor 330 to be greater than when the sieve hole is not blocked.

[0064] In S7, the proximity of the abnormal time point is used to determine the blockage situation. This is primarily because blockage often begins when debris or powder adheres to the sieve's pore walls. In other words, the sieve's pore walls often serve as the source of the blockage. When only a small amount of powder or small particles adhere to the pore walls, the central portion of the sieve still has a large flow area. Therefore, when the detection needle 400 is inserted, the tip 410 enters first, making it less likely to be obstructed. As the insertion length increases, the corresponding outer diameter of the detection needle 400 increases. When the outer wall of the detection needle 400 contacts the powder or small particles adhered to the sieve's pore walls, an obstruction forms. Therefore, if the sieve's pores are not severely blocked, the less powder or small particles adhere to the pore walls, and the later the blockage occurs. If the sieve's pores are severely blocked, the more powder or small particles adhere to the pore walls, and the earlier the blockage occurs.

[0065] The above design can detect and analyze the actual situation of the sieve holes, thereby helping to monitor the stability of the sieve hole screening capacity in real time. If it is found that a large number of sieve holes are blocked, which will significantly affect the screening efficiency, the sieve holes can be uniformly dredged and treated to ensure the efficiency and quality of the screening work.

[0066] In general, the sieve hole blockage condition detection method provided in the embodiment of the present invention can conveniently and sensitively detect the blockage condition of the sieve hole, help determine whether the sieve hole is in the best working state, and thus ensure the smooth progress of the screening work.

[0067] Please refer to Figure 2-Figure 5 This embodiment also provides a particle size screening device, which includes: a frame (not shown in the figure), a roller 100, a control arm 200, a reference column 300, a detection needle 400 and a control end (not shown in the figure).

[0068] The drum 100 is cylindrical and rotatably mounted on a frame and driven by a first driver (not shown). The sidewalls of the drum 100 are provided with mesh holes. The number, distribution density, and aperture of the mesh holes can be flexibly set according to actual needs and are not specifically limited in this application.

[0069] One end of the drum 100 is the feed end 110, and the other end is the discharge end 120. When the drum 100 is mounted on a frame, the feed end 110 is higher in height than the discharge end 120. The degree to which the feed end 110 is higher than the discharge end 120 can be flexibly adjusted based on actual conditions. Generally, for a given length and rotational speed of the drum 100, the higher the feed end 110 is relative to the discharge end 120, the shorter the time required for material to travel from the feed end 110 to the discharge end 120.

[0070] The control arm 200 is located outside the drum 100, and the control arm 200 is arranged along the axial direction of the drum 100 and spaced apart from the drum 100. The reference column 300 is fixedly installed on the control arm 200, and the reference column 300 is arranged along the radial direction of the drum 100. The reference column 300 is located on the side of the control arm 200 close to the drum 100.

[0071] The reference post 300 has an inner cavity 310, which is cylindrical and extends along the length of the reference post 300. Optionally, the inner cavity 310 and the reference post 300 are coaxially arranged.

[0072] A sliding member 320 slidably engages within the inner cavity 310. A pressure sensor 330 is provided on the end wall of the inner cavity 310 away from the drum 100. An elastic member 340 abuts between the sliding member 320 and the pressure sensor 330. In a natural state, the sliding member 320 adheres to the end wall of the inner cavity 310 closer to the drum 100 due to the elastic force of the elastic member 340.

[0073] A connecting rod 350 is fixedly connected to one side of the sliding member 320 close to the drum 100 . The connecting rod 350 passes through the end wall of the reference column 300 and extends outside the reference column 300 .

[0074] The detection needle 400 is arranged along the length of the reference column 300 and is fixedly connected to the end of the connecting rod 350 away from the sliding member 320. The detection needle 400, the sliding member 320 and the connecting rod 350 are arranged coaxially. The tip 410 of the detection needle 400 is arranged toward the drum 100.

[0075] The outer diameter of the detection needle 400 decreases in a direction from the end of the detection needle 400 away from the drum 100 to the tip 410. The cross section of the detection needle 400 is circular, and the maximum outer diameter of the detection needle 400 is larger than the aperture of the sieve.

[0076] The control arm 200 is driven by a second driver (not shown in the drawings) so that the control arm 200 can approach and move away from the drum 100 in the radial direction of the drum 100 .

[0077] In this embodiment, the control arm 200 , the reference post 300 and the detection needle 400 are all located directly above the drum 100 .

[0078] The first driver, the second driver and the pressure sensor 330 are all electrically connected to the control terminal.

[0079] The control end is used to adjust the rotation speed of the drum 100 when the first driver drives the drum 100 , and determine the time point when the sieve hole moves to the detection needle 400 according to the rotation speed of the drum 100 .

[0080] When the sieve aperture moves to the detection needle 400, the control end controls the second driver to drive the control arm 200 toward the drum 100, thereby inserting the detection needle 400 into the sieve aperture. The control end then assesses whether the sieve aperture is clogged based on the pressure change data from the pressure sensor 330. The duration that the second driver drives the control arm 200 toward and away from the drum 100 can be flexibly set based on actual conditions (e.g., the rotation speed of the drum 100). It is important to ensure that the rotation angle of the drum 100 during the period of time during which the detection needle 400 is inserted into and removed from the sieve aperture is controlled within a reasonable range to prevent damage to the detection needle 400.

[0081] The control end is further used to execute the above-mentioned sieve hole blockage condition detection method to determine the blockage condition of the sieve hole.

[0082] Specifically, when the control end executes the above-mentioned sieve hole blockage detection method, it includes executing the following process (it should be noted that since the particle size screening device is already provided with the pressure sensor 330, the elastic member 340 and the detection needle 400, the control end no longer executes S1 in the above-mentioned sieve hole blockage detection method):

[0083] D1. Collect standard data. Standard data is obtained as follows: When the sieve aperture is not blocked and the sieve aperture moves to the detection needle 400, the second actuator is controlled to drive the control arm 200 to move a preset distance toward the drum 100 (the specific value of the preset distance can be flexibly adjusted according to actual needs). After the control arm 200 moves the preset distance, the detection needle 400 enters the sieve aperture and abuts against the drum 100, and the slider 320 separates from the end wall of the inner cavity 310 closest to the drum 100. The "pressure-time" data detected by the pressure sensor 330 during this process is used as standard data.

[0084] D2. During the screening process, when the sieve hole moves to the detection needle 400, the second driver is controlled to drive the control arm 200 to move a preset distance toward the drum 100, and the "pressure-time" data detected by the pressure sensor 330 during this process is collected as pressure change data.

[0085] D3. Compare the pressure change data with the standard data. If, at the same time point, the corresponding pressure in the pressure change data is greater than the corresponding pressure in the standard data, it is determined that the sieve hole is clogged.

[0086] D4. If it is determined in D3 that there is blockage, and the pressure corresponding to the last time point in the pressure change data is greater than the pressure corresponding to the last time point in the standard data, it is determined that the sieve hole is blocked.

[0087] D5. If it is determined in D3 that there is blockage, and the pressure corresponding to the last time point in the pressure change data is equal to the pressure corresponding to the last time point in the standard data, it is determined that the sieve hole has been unblocked.

[0088] D6. In the pressure change data, determine the earliest time point where the pressure in the pressure change data is greater than the pressure in the standard data at the same time point. This is recorded as the abnormal time point. The earlier the abnormal time point, the larger the flow area of the sieve hole that is blocked.

[0089] The above method is based on the following principle: if the sieve hole is partially or completely blocked, the detection needle 400 will be obstructed during insertion, resulting in the actual insertion depth of the detection needle 400 being less than the depth it would have been if the sieve hole were not blocked. Because the insertion of the detection needle 400 is somewhat obstructed, the detection needle 400 is closer to the reference post 300, which in turn brings the sliding member 320 closer to the pressure sensor 330. As a result, the elastic member 340 is compressed to a greater extent, and the pressure detected by the pressure sensor 330 is greater than when the sieve hole is not blocked.

[0090] In D6, the proximity of abnormal time points is used to determine blockage. This is primarily because blockage often begins when debris or powder adheres to the sieve's pore walls. In other words, the sieve's pore walls often serve as the source of the blockage. When only a small amount of powder or small particles adhere to the pore walls, the central portion of the sieve still retains a large flow area. Therefore, when the test needle 400 is inserted, the tip 410 enters first, making it less likely to be obstructed. As the insertion length increases, the corresponding outer diameter of the test needle 400 increases. When the outer wall of the test needle 400 comes into contact with the powder or small particles adhered to the sieve's pore walls, it becomes an obstruction. Therefore, if the sieve's pores are not severely blocked, the less powder or small particles adhere to the pore walls, and the later the blockage occurs. If the sieve's pores are severely blocked, the more powder or small particles adhere to the pore walls, and the earlier the blockage occurs.

[0091] The above design allows for detection and analysis of the actual conditions of the drum 100, thereby helping to monitor in real time the stability of the screening capacity of the drum 100. If a large number of mesh holes are found to be clogged, significantly affecting the screening efficiency, the mesh holes of the drum 100 can be uniformly cleared and treated to ensure the efficiency and quality of the screening work.

[0092] It should be noted that when the first driver drives the drum 100 to rotate, the drum 100 may be driven to rotate continuously at a preset speed or intermittently.

[0093] When the rotation is intermittent, it is easier for the detection needle 400 to detect the corresponding sieve hole, while avoiding accidental damage to the detection needle 400. In this case, the drum 100 can be stopped after rotating a preset number of times to detect the sieve hole, but is not limited thereto.

[0094] The aperture of the sieve can be set to the lower limit of the required particle size. When screening begins, the drum 100 is driven and the material is fed from the feed end 110 of the drum 100. Debris, powder, etc. with smaller particle sizes can fall from the sieve holes of the drum 100 and be separated.

[0095] In general, the particle size screening device provided in this embodiment can effectively improve the separation efficiency of smaller particles and debris in the granular raw materials, maintain the continuous stability of the separation effect, and has positive significance for improving the particle size uniformity of the granular raw materials.

[0096] In this embodiment, the sieve holes of the drum 100 are evenly spaced circumferentially and axially. In other words, the sieve holes can be considered to be evenly spaced in several rows. Accordingly, the number of reference posts 300 provided on the control arm 200 is the same as the number of sieve holes in a row. These reference posts 300 are evenly spaced along the axial direction of the drum, allowing them to be matched with any row of sieve holes. When the control arm 200 drives the reference posts 300 toward the drum 100, the entire row of sieve holes can be inspected simultaneously.

[0097] In this embodiment, the discharge end 120 is provided with a first baffle 500, which is positioned perpendicular to the central axis of the drum 100. The first baffle 500 is rotatably engaged with the discharge end 120 and driven by a third driver (not shown). The periphery of the first baffle 500 is aligned with the inner sidewall of the drum 100. The rotation axis of the first baffle 500 coincides with the rotation axis of the drum 100. The first baffle 500 defines a discharge notch 510, extending from the periphery to the center of the first baffle 500. During the screening process, the drum 100 can rotate smoothly relative to the first baffle 500, which is controlled solely by the third driver.

[0098] During the screening process, the first baffle 500 may be driven to rotate by the third driver, thereby changing the angle of the discharge notch 510 .

[0099] When the discharge notch 510 is at the lowest position, Figure 6 As shown, at this time, the position of the discharge notch 510 does not change during the rotation of the drum 100. In this state, when the material moves from the feed end 110 to the discharge end 120, it can leave the drum 100 through the discharge notch 510 as soon as possible.

[0100] When the discharge notch 510 is located slightly higher than the lowest position, as shown in FIG. Figure 7 As shown, at this time, the position of the discharge gap 510 does not change during the rotation of the drum 100. In this state, when the material moves from the feed end 110 to the discharge end 120, it will first be blocked by the first baffle 500. As the feed end 110 continues to feed, the amount of material in the drum 100 further increases, and the height of the material at the first baffle 500 increases until it reaches the height of the discharge gap 510. Then the material can leave the drum 100 through the discharge gap 510.

[0101] Optional, such as Figure 7 As shown in the figure, the position of the discharge notch 510 is located on the right side of the lowest position of the discharge end 120 of the drum 100, so the rotation direction of the drum 100 can be set as follows Figure 7 When the position of the discharge notch 510 is located on the left side of the lowest position of the discharge end 120 of the drum 100, the rotation direction of the drum 100 can be set as follows: Figure 7 , counterclockwise from the perspective shown in . This design continuously flips the material at the bottom upward during rotation. The flipped material at the bottom enters the upper layer and flows toward the discharge notch 510, ultimately exiting smoothly through the discharge notch 510. This effectively extends the average residence time of the material within the drum 100 to a certain extent. As the first baffle 500 rotates, further raising the height of the discharge notch 510, the residence time of the material within the drum 100 can be further extended.

[0102] When the discharge notch 510 is at the highest position, Figure 8 As shown, at this time, during the rotation of the drum 100 , the position of the discharge notch 510 does not change. In this state, the material can stay in the drum 100 for the longest time.

[0103] from Figure 6-Figure 8 It can be seen from the changes that as the height of the discharge notch 510 becomes higher and higher, the average residence time of the material in the drum 100 gradually becomes longer, thereby meeting different screening time requirements.

[0104] Furthermore, the feed end 110 is provided with a second baffle 600 , which is arranged perpendicular to the central axis of the drum 100 . The second baffle 600 is fixedly fitted to the feed end 110 , and the periphery of the second baffle 600 is in contact with the inner wall of the drum 100 .

[0105] The second baffle 600 is equipped with a feed pipe 610, which is coaxially arranged with the drum 100, passes through the second baffle 600 and rotates with the second baffle 600. The feed pipe 610 is used to communicate with the conveying channel for conveying materials, thereby introducing the materials into the drum 100.

[0106] Optionally, a cylindrical, hollow housing 700 may be provided. The drum 100 and the housing 700 are coaxially arranged, with the ends of the drum 100 extending through the end walls of the housing 700. The drum 100 is rotatably engaged with the housing 700. A gap is provided between the outer wall of the drum 100 and the inner wall of the housing 700, meaning that the inner diameter of the housing 700 is larger than the outer diameter of the drum 100. A drop opening 710 is provided at the bottom of the housing 700 for powder / small particles to fall out, thereby facilitating the collection of the powder / small particles and preventing dust.

[0107] In addition, a clearance hole 720 for the reference column 300 needs to be opened on the housing 700 to facilitate the movement of the reference column 300 toward the drum 100.

[0108] As an application example of the particle size screening device provided in this embodiment, the particle size screening device can be used to screen silicon source particles (e.g. SiO x particles) for sieving.

[0109] In summary, the particle size screening device provided in the embodiment of the present invention can effectively improve the separation efficiency of smaller particles and debris in the granular raw materials, maintain the continuous stability of the separation effect, and has positive significance for improving the particle size uniformity of the granular raw materials. The above is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A particle size screening method, characterized in that: include: Equipped with particle size screening device; The cam is fixedly mounted on the roller and has a first end for receiving the roller and a second end for receiving the roller, wherein the cam is fixedly mounted on the roller and has a first end for receiving the roller and a second end for receiving the roller. The first baffle is provided at the discharge end, the first baffle being arranged perpendicular to the central axis of the drum, the first baffle being rotatably engaged with the discharge end and being driven by a third driver, the peripheral edge of the first baffle being in contact with the inner side wall of the drum; the first baffle being provided with a discharge notch, the discharge notch extending from the peripheral edge of the first baffle to the middle thereof; The control end is used to collect standard data, and the standard data is obtained by: when the sieve hole is not blocked, controlling the control arm to move a preset distance toward the sieve hole so as to move the detection needle into the sieve hole, and using the "pressure-time" data detected by the pressure sensor during this process as the standard data; During detection, the control arm is controlled by the control end to move the preset distance toward the sieve hole, and the "pressure-time" data detected by the pressure sensor during this process is collected as pressure change data; The control end is used to compare the pressure change data with the standard data. If, at the same time point, the corresponding pressure in the pressure change data is greater than the corresponding pressure in the standard data, it is determined that the sieve hole is clogged.

2. The particle size screening method according to claim 1, wherein Also includes: If the control end determines that the sieve hole is clogged, and the pressure corresponding to the last time point in the pressure change data is greater than the pressure corresponding to the last time point in the standard data, the control end determines that the sieve hole is clogged.

3. The particle size screening method according to claim 1, wherein Also includes: If the control end determines that the sieve hole is blocked, and the pressure corresponding to the last time point in the pressure change data is equal to the pressure corresponding to the last time point in the standard data, the control end determines that the sieve hole has been unblocked.

4. The particle size screening method according to claim 1, characterized in that Also includes: The control end is used to determine the earliest time point in the pressure change data at which "at the same time point, the corresponding pressure in the pressure change data is greater than the corresponding pressure in the standard data", and record it as the abnormal time point; the earlier the abnormal time point is, the larger the flow area of the sieve hole that is blocked.

5. The particle size screening method according to claim 1, characterized in that: When configuring the particle size screening device, it also includes: a second baffle is set at the feed end, the second baffle is set perpendicular to the central axis of the drum, the second baffle is fixedly fitted to the feed end, and the periphery of the second baffle is in contact with the inner wall of the drum; the second baffle is equipped with a feed pipe, the feed pipe is coaxially arranged with the drum, and the feed pipe passes through the second baffle and rotates with the second baffle.

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