Screen hole blocking condition detection method and particle size screening device

Abstract

The invention relates to the technical field of particle size control of particle raw materials, in particular to a sieve pore blocking condition detection method and a particle size screening device. The sieve pore blocking condition detection method comprises the steps that a pressure sensor and a detection needle are arranged, and an elastic piece is arranged between the detection needle and the pressure sensor; when the screen holes are not blocked, the pressure sensor is controlled to move towards the screen holes by a preset distance, and pressure-time data detected by the pressure sensor in the process serve as standard data; during detection, the pressure sensor is controlled to move towards the sieve holes by a preset distance, and pressure-time data detected by the pressure sensor in the process are collected as pressure change data; and if the corresponding pressure in the pressure change data is greater than the corresponding pressure in the standard data at the same time point, determining that the sieve pores are blocked. The screening device can conveniently and sensitively detect the blocking condition of the screening holes and help to judge whether the screening holes are in the optimal working state or not, and therefore it is guaranteed that screening work is conducted smoothly.

Description

Technical Field

[0001] The invention relates to the technical field of particle size control of granular raw materials, and in particular to a sieve hole clogging condition detection method 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] In the prior art, there is often a problem of insufficient separation at a single time. In order to ensure the adequacy of separation, the separation operation usually needs to be repeated, which seriously slows down the production efficiency. In addition, in actual operation, there is often a problem that "even after repeated separation, the broken particles or debris are still not separated sufficiently."

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

[0005] The first object 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 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.

[0007] The embodiment of the present invention is achieved as follows: A method for detecting sieve hole blockage conditions comprises the following steps: S1. A pressure sensor and a detection needle are provided. The tip of the detection needle is used to insert into the sieve hole. An elastic member is provided between the detection needle and the pressure sensor.

[0008] 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.

[0009] 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.

[0010] 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 blocked.

[0011] Furthermore, the sieve hole blockage detection method further comprises the following steps: 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.

[0012] Furthermore, the sieve hole blockage detection method further comprises the following steps: 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.

[0013] Furthermore, the sieve hole blockage detection method further comprises the following steps: S7. In the pressure change data, determine the earliest time point 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 is.

[0014] A particle size screening device comprises a frame, a roller, a control arm, a reference column, a detection needle and a control end.

[0015] The drum is rotatably mounted on the frame and driven by the first driver, and a sieve hole is provided 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.

[0016] The control arm is arranged along the axial direction of the drum and is spaced apart from the drum. The reference column is fixedly installed on the control arm, and the reference column is arranged along the radial direction of the drum.

[0017] The reference column has an inner cavity, which extends along the length direction of the reference column. A sliding member is slidably matched in the inner cavity, and a pressure sensor is arranged on the end wall of the inner cavity away from the roller. An elastic member is abutted between the sliding member and the pressure sensor, so that in a natural state, the sliding member fits against the end wall of the inner cavity close to the roller.

[0018] A connecting rod is fixedly connected to one side of the sliding member close to the roller, and the connecting rod penetrates the end wall of the reference column and extends outside the reference column. A detection needle is arranged along the length direction of the reference column and fixedly connected to one end of the connecting rod away from the sliding member, and the tip of the detection needle is arranged toward the roller.

[0019] The outer diameter of the detection needle decreases in the direction from the end of the detection needle away from the roller to the tip, and the maximum outer diameter of the detection needle is greater than the aperture of the sieve hole.

[0020] 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.

[0021] The first driver, the second driver and the pressure sensor are all electrically connected to the control end. The control end is used to control the second driver to drive the control arm close to the roller when the sieve hole moves to the detection needle, so that the detection needle is inserted into the sieve hole. The control end is also used to execute the above-mentioned sieve hole blocking condition detection method to determine the blocking condition of the sieve hole.

[0022] Furthermore, a first baffle is provided at the discharge end, the first baffle is provided perpendicular to the central axis of the drum, the first baffle is rotatably matched with the discharge end and driven by a third driver, and the periphery of the first baffle is in contact with the inner wall of the drum.

[0023] The first baffle plate is provided with a material discharging notch, and the material discharging notch extends from the periphery of the first baffle plate to the middle thereof.

[0024] 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 fitted with the inner wall of the drum.

[0025] The second baffle is matched 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.

[0026] The beneficial effects of the technical solution of the embodiment of the present invention include: The sieve hole blockage detection method provided in the embodiment of the present invention can detect and analyze the actual situation of the sieve hole, thereby helping to monitor the stability of the sieve hole's screening ability 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 processed to ensure the efficiency and quality of the screening work.

[0027] 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, and help determine whether the sieve hole is in the best working state, thereby ensuring the smooth progress of the screening work.

[0028] The particle size screening device provided by the embodiment of the present invention can detect and analyze the actual situation of the drum, thereby helping to monitor the stability of the screening ability of the drum in real time. If it is found that many screen holes are blocked, which will obviously affect the screening efficiency, the screen holes of the drum can be uniformly dredged and processed to ensure the efficiency and quality of the screening work.

[0029] 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

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0031] 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 in an embodiment of the present invention; Figure 2 A schematic diagram of the structure of the particle size screening device provided by an embodiment of the present invention from the perspective of the drum end; Figure 3 A schematic diagram of the structure of a particle size screening device provided by an embodiment of the present invention in a side view; Figure 4 It is a schematic diagram of the structure when the control arm is away from the drum; Figure 5 It is a schematic diagram of the structure when the control arm is close to the drum; Figure 6 It is a structural schematic diagram when the discharge notch is at the lowest position; Figure 7 It is a structural schematic diagram when the discharge gap is located between the lowest position and the highest position; Figure 8 It is a structural schematic diagram when the discharge gap is at the highest position.

[0032] Description of reference numerals: 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

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 here can be arranged and designed in various different configurations.

[0034] 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 claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] 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, further definition and explanation thereof is not required in subsequent drawings.

[0036] The terms “first”, “second”, “third”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0037] In addition, the terms "parallel", "vertical", etc. do not mean that the components must be absolutely parallel or vertical, but can be slightly tilted. For example, "parallel" only means that its direction is more parallel than "vertical", and does not mean that the structure must be completely parallel, but can be slightly tilted.

[0038] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting", "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a communication between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] The inventor of the present application has found that in actual operation, the problem of "fragments or debris are still not separated sufficiently even after repeated separation" often occurs. This is usually caused by the sieve holes of the sieve plate being partially or completely blocked during the separation process. If the sufficiency of separation is to be ensured, the sieve plate needs to be cleaned frequently, which greatly increases the extra burden and further reduces production efficiency.

[0040] In order to overcome the defects in the prior art, this embodiment provides a method for detecting a sieve hole blockage condition, and the sieve hole blockage condition detection method comprises the following steps: S1. A pressure sensor 330 and a detection needle 400 are provided. The tip 410 of the detection needle 400 is used to be inserted into the sieve hole. An elastic member 340 is provided between the detection needle 400 and the pressure sensor 330. Figure 1 shown.

[0041] 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 in this process as standard data.

[0042] S3. During detection, the pressure sensor 330 is controlled to move a preset distance toward the sieve hole, and the “pressure-time” data detected by the pressure sensor 330 during this process is collected as pressure change data.

[0043] 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 blocked.

[0044] Furthermore, the sieve hole blockage detection method further comprises the following steps: 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.

[0045] 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.

[0046] S7. In the pressure change data, determine the earliest time point 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 is.

[0047] It should be noted that if the mesh hole is partially or completely blocked, the detection needle 400 will be blocked when inserted into the mesh hole, resulting in the detection needle 400 actually being inserted to a depth less than when the mesh hole is not blocked. Since the insertion of the detection needle 400 is blocked to a certain extent, the detection needle 400 will be closer to the pressure sensor 330, so the elastic member 340 is compressed to a greater extent, and the pressure detected by the pressure sensor 330 is greater than when it is not blocked.

[0048] In S7, the blockage is judged by the front degree of the abnormal time point, mainly because when the blockage occurs, it often starts from the debris and powder adhering to the hole wall of the sieve hole, that is, the origin of the blockage problem is often the hole wall of the sieve hole. When only a small amount of powder / small particles adhere to the hole wall, there is still a large flow area in the middle of the sieve hole. When the detection needle 400 is inserted, the tip 410 of the detection needle 400 enters first, and the tip 410 is not easily blocked. As the insertion length gradually increases, the corresponding outer diameter of the detection needle 400 gradually increases. When the outer wall of the detection needle 400 contacts the powder / small particles adhering to the hole wall of the sieve hole, it will form a blockage for the detection needle 400. Therefore, if the blockage of the sieve hole is not serious, the less the amount of powder / small particles adhering to the hole wall, the later the time when the detection needle 400 is blocked. If the blockage of the sieve hole is serious, the more the amount of powder / small particles adhering to the hole wall, the earlier the time when the detection needle 400 is blocked.

[0049] Through the above design, the actual situation of the sieve holes can be detected and analyzed, so as to help monitor the stability of the sieve hole's screening capacity in real time. If it is found that many sieve holes are blocked, it will obviously affect the screening efficiency. The sieve holes can be uniformly dredged and processed to ensure the efficiency and quality of the screening work.

[0050] 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, and help determine whether the sieve hole is in the best working state, thereby ensuring the smooth progress of the screening work.

[0051] Please refer to Figure 2-Figure 5 The present embodiment further 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).

[0052] The drum 100 is cylindrical, rotatably mounted on the frame and driven by a first driver (not shown in the figure), and a sieve hole is provided on the side wall of the drum 100. The number, distribution density and aperture of the sieve holes can be flexibly set according to actual needs, and are not specifically limited in this application.

[0053] One end of the drum 100 is a feed end 110, and the other end is a discharge end 120. When the drum 100 is mounted on the frame, in the height direction, the feed end 110 is higher than the discharge end 120. The degree to which the feed end 110 is higher than the discharge end 120 can be flexibly set according to actual conditions. Generally, when the length and rotation speed of the drum 100 are constant, the higher the height of the feed end 110 is than the height of the discharge end 120, the shorter the time required for the material to reach the discharge end 120 from the feed end 110.

[0054] The control arm 200 is located outside the drum 100, and 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 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.

[0055] The reference column 300 has an inner cavity 310, which is cylindrical and extends along the length direction of the reference column 300. Optionally, the inner cavity 310 and the reference column 300 are coaxially arranged.

[0056] A sliding member 320 is slidably fitted in the inner cavity 310, and a pressure sensor 330 is provided at one end wall of the inner cavity 310 away from the drum 100. An elastic member 340 is abutted between the sliding member 320 and the pressure sensor 330, so that in a natural state, the sliding member 320 can be attached to one end wall of the inner cavity 310 close to the drum 100 under the elastic force of the elastic member 340.

[0057] A connecting rod 350 is fixedly connected to one side of the sliding member 320 close to the drum 100 . The connecting rod 350 penetrates the end wall of the reference column 300 and extends outside the reference column 300 .

[0058] The detection needle 400 is arranged along the length direction of the reference column 300 and fixedly connected to one 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.

[0059] The outer diameter of the detection needle 400 decreases in the 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 greater than the aperture of the sieve.

[0060] 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 .

[0061] In this embodiment, the control arm 200 , the reference column 300 and the detection needle 400 are all located directly above the drum 100 .

[0062] The first driver, the second driver and the pressure sensor 330 are all electrically connected to the control end.

[0063] The control end is used to adjust the rotation speed of the first driver when driving 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 .

[0064] When the mesh moves to the detection needle 400, the control end controls the second driver to drive the control arm 200 to approach the drum 100, so that the detection needle 400 is inserted into the mesh, and the mesh is evaluated whether it is blocked according to the pressure change data of the pressure sensor 330. The duration of the second driver driving the control arm 200 to approach the drum 100 and then move away from the drum 100 can be flexibly set according to the actual situation (for example, the rotation speed of the drum 100), and it is necessary to ensure that the rotation angle of the drum 100 is controlled within a reasonable range during the period when the detection needle 400 is inserted into the mesh and withdrawn from the mesh, so as to avoid damage to the detection needle 400.

[0065] The control end is also used to execute the above-mentioned sieve hole blockage condition detection method to determine the blockage condition of the sieve hole.

[0066] Specifically, when the control end executes the above-mentioned sieve hole blockage condition detection method, it includes executing the following process (it should be noted that, since the pressure sensor 330, the elastic member 340 and the detection needle 400 are already provided in the particle size screening device, the control end no longer executes S1 in the above-mentioned sieve hole blockage condition detection method): D1. Collect standard data. The standard data is obtained in the following way: when the mesh is not blocked, when the mesh moves to the detection needle 400, control the second driver to drive the control arm 200 to move toward the drum 100 by a preset distance (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 is inserted into the mesh and abuts against the drum 100, and the sliding member 320 is separated from the end wall of the inner cavity 310 close to the drum 100. The "pressure-time" data detected by the pressure sensor 330 in this process is used as the standard data.

[0067] 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.

[0068] 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 blocked.

[0069] 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.

[0070] 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.

[0071] D6. In the pressure change data, determine the earliest time point 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 is.

[0072] The above method is based on the following principle: if the sieve hole is partially or completely blocked, the detection needle 400 will be blocked when inserted into the sieve hole, resulting in the detection needle 400 actually being inserted to a depth less than when the sieve hole is not blocked. Since the insertion of the detection needle 400 is blocked to a certain extent, the detection needle 400 is closer to the reference column 300, which makes the sliding member 320 closer to the pressure sensor 330. Therefore, the elastic member 340 is compressed to a greater extent, and the pressure detected by the pressure sensor 330 is greater than when it is not blocked.

[0073] In D6, the blockage is judged by the front degree of the abnormal time point, mainly because when the blockage occurs, it often starts from the debris and powder adhering to the hole wall of the sieve hole, that is, the origin of the blockage problem is often the hole wall of the sieve hole. When only a small amount of powder / small particles adhere to the hole wall, there is still a large flow area in the middle of the sieve hole. When the detection needle 400 is inserted, the tip 410 is not easily blocked because it enters first. As the insertion length gradually increases, the corresponding outer diameter of the detection needle 400 gradually increases. When the outer wall of the detection needle 400 contacts the powder / small particles adhering to the hole wall of the sieve hole, it will form a blockage for the detection needle 400. Therefore, if the blockage of the sieve hole is not serious, the less the amount of powder / small particles adhering to the hole wall, the later the time when the detection needle 400 is blocked. If the blockage of the sieve hole is serious, the more the amount of powder / small particles adhering to the hole wall, the earlier the time when the detection needle 400 is blocked.

[0074] Through the above design, the actual situation of the drum 100 can be detected and analyzed, thereby helping to monitor the stability of the screening ability of the drum 100 in real time. If it is found that many screen holes are blocked, which will obviously affect the screening efficiency, the screen holes of the drum 100 can be uniformly dredged and processed to ensure the efficiency and quality of the screening work.

[0075] 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.

[0076] When the rotation is intermittent, it is easier for the detection needle 400 to detect the corresponding mesh 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 mesh hole, but it is not limited thereto.

[0077] The aperture of the sieve hole can be set to the lower limit of the required particle size. When screening starts, the drum 100 is driven to feed the material from the feed end 110 of the drum 100. Crumbs and powders with smaller particle sizes can fall from the sieve holes of the drum 100 and be separated.

[0078] 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 uniformity of the particle size of the granular raw materials.

[0079] In this embodiment, the sieve holes of the drum 100 are evenly spaced in the circumferential direction and are also evenly spaced in the axial direction. That is to say, in the circumferential direction, it can be regarded as a plurality of rows of sieve holes evenly spaced in the circumferential direction. 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 to match any row of sieve holes. When the control arm 200 drives the reference posts 300 to approach the drum 100, a row of sieve holes can be detected at the same time.

[0080] In this embodiment, the discharge end 120 is provided with a first baffle 500, which is arranged perpendicular to the central axis of the drum 100, and the first baffle 500 is rotatably matched with the discharge end 120 and driven by a third driver (not shown in the figure), and the periphery of the first baffle 500 is in contact with the inner side wall of the drum 100. The rotation axis of the first baffle 500 is arranged to coincide with the rotation axis of the drum 100. The first baffle 500 is provided with a discharge notch 510, which extends from the periphery of the first baffle 500 to the middle thereof. During the screening process, the drum 100 can smoothly rotate relative to the first baffle 500, and the first baffle 500 is only controlled by the third driver.

[0081] 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 .

[0082] When the discharge notch 510 is at the lowest position, Figure 6 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, 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 at the first time.

[0083] When the discharge notch 510 is located slightly higher than the lowest position, as Figure 7As shown, at this time, during the rotation of the drum 100, the position of the discharge notch 510 does not change. 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 notch 510, and then the material can leave the drum 100 through the discharge notch 510.

[0084] 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 to the left 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 . With this design, the drum 100 continuously turns the materials at the bottom upwards during the rotation process, and the turned materials at the bottom enter the upper layer and flow to the position of the discharge notch 510, and finally smoothly leave the discharge notch 510. This is equivalent to extending the average residence time of the materials in the drum 100 to a certain extent. When the first baffle 500 rotates to make the height of the discharge notch 510 continue to increase, the residence time of the materials in the drum 100 can be further extended.

[0085] 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.

[0086] 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 time that the material can stay in the drum 100 gradually becomes longer, thereby meeting different screening time requirements.

[0087] Furthermore, the feed end 110 is provided with a second baffle 600 , which is arranged perpendicular to the central axis of the drum 100 , and 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 .

[0088] 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 is rotatably matched with the second baffle 600. The feed pipe 610 is used to communicate with the conveying channel for conveying materials, so as to introduce the materials into the drum 100.

[0089] Optionally, a shell 700 may be provided, the shell 700 is cylindrical, and the shell 700 is a hollow structure. The drum 100 and the shell 700 are coaxially arranged, and the two ends of the drum 100 respectively penetrate the two end walls of the shell 700, and the drum 100 is rotatably matched with the shell 700. A gap is left between the outer wall of the drum 100 and the inner wall of the shell 700, that is, the inner diameter of the shell 700 is larger than the outer diameter of the drum 100. A drop opening 710 for powder / small particles to fall out is provided at the bottom of the shell 700, so as to facilitate the collection of powder / small particles and avoid dust.

[0090] In addition, a clearance hole 720 for making way 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 .

[0091] 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) are screened.

[0092] 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 a positive significance for improving the particle size uniformity of the granular raw materials. The above description 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 may 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 method for detecting sieve hole blockage, characterized in that: The steps include: S1. Setting a pressure sensor and a detection needle, wherein the tip of the detection needle is used to insert into a sieve hole, and an elastic member is provided between the detection needle and the pressure sensor; S2, collecting standard data, wherein the standard data is obtained in the following manner: when the sieve hole is not blocked, controlling the pressure sensor to move toward the sieve hole by a preset distance so that the detection needle moves into the sieve hole, and using the "pressure-time" data detected by the pressure sensor in this process as the standard data; S3, during detection, controlling the pressure sensor to move toward the sieve hole by the preset distance, and collecting the "pressure-time" data detected by the pressure sensor during this process as the pressure change data; 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.

2. The method for detecting sieve hole blockage according to claim 1, characterized in that: The following steps are also included: 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.

3. The method for detecting sieve hole blockage according to claim 1, characterized in that: The following steps are also included: 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.

4. The method for detecting sieve hole blockage according to claim 1, characterized in that: The following steps are also included: S7. In the pressure change data, determine the earliest time point 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 is.

5. A particle size screening device, characterized in that: include: Frame, roller, control arm, reference column, detection pin and control end; The drum is rotatably mounted on the frame and driven by a first driver, and a sieve hole is provided on a side wall of the drum; one end of the drum is a feed end, and the other end is a discharge end; in height direction, the feed end is higher than the discharge end; The control arm is arranged along the axial direction of the drum and is spaced apart from the drum, the reference column is fixedly mounted on the control arm, and the reference column is arranged along the radial direction of the drum; The reference column has an inner cavity, and the inner cavity extends along the length direction of the reference column; a sliding member is slidably matched in the inner cavity, and a pressure sensor is arranged on an end wall of the inner cavity away from the roller; an elastic member is abutted between the sliding member and the pressure sensor, so that in a natural state, the sliding member is attached to the end wall of the inner cavity close to the roller; A connecting rod is fixedly connected to one side of the sliding member close to the roller, and the connecting rod penetrates the end wall of the reference column and extends outside the reference column; the detection needle is arranged along the length direction of the reference column and fixedly connected to an end of the connecting rod away from the sliding member, and the tip of the detection needle is arranged toward the roller; In the direction from the end of the detection needle away from the roller to the tip, the outer diameter of the detection needle decreases; the maximum outer diameter of the detection needle is greater than the aperture of the sieve hole; The control arm is driven by a second driver so that the control arm can move closer to and farther from the drum in the radial direction of the drum; The first driver, the second driver and the pressure sensor are all electrically connected to the control end; The control end is used to control the second driver to drive the control arm close to the roller when the sieve hole moves to the detection needle, so that the detection needle is inserted into the sieve hole; the control end is also used to execute the sieve hole blockage condition detection method as described in any one of claims 1 to 4 to determine the blockage condition of the sieve hole.

6. The particle size screening device according to claim 5, characterized in that: The discharge end is provided with a first baffle, which is arranged perpendicular to the central axis of the drum, and the first baffle is rotatably matched with the discharge end and driven by a third driver, and the periphery of the first baffle is in contact with the inner side wall of the drum; The first baffle plate is provided with a discharge notch, and the discharge notch extends from the periphery of the first baffle plate to the middle thereof.

7. The particle size screening device according to claim 5, characterized in that: The feed end is provided with a second baffle, the second baffle is arranged perpendicular to the central axis of the drum, the second baffle is fixedly matched with the feed end, and the periphery of the second baffle is in contact with the inner side wall of the drum; The second baffle is matched with a feed pipe, the feed pipe is coaxially arranged with the roller, and the feed pipe passes through the second baffle and is rotatably matched with the second baffle.

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