A cement product particle fraction sizing device

Abstract

The present application relates to cement product particle grading technical field, specifically to a kind of cement product particle grading device, grading device includes feeding device, grading device, collection device and induced draft fan, feeding device and grading device pipeline intercommunication, induced draft fan import and grading device pipeline intercommunication, induced draft fan outlet and collection device intercommunication, feeding device is used to scatter cement, grading device is used to carry out internal circulation type grading to cement.The feeding device is used to transport cement product, and is sent into grading device for grading treatment, after treatment, through induced draft fan, it is sent into collection device, and fine powder cement particles are collected, coarse powder cement particles still remain in grading device, and flow out from the bottom discharge port, facilitate collection, and the grading device is used to carry out internal circulation to cement, to improve grading efficiency.

Description

Technical Field

[0001] This invention relates to the field of cement particle size classification technology, specifically to a cement particle size classification device. Background Technology

[0002] Cement, as one of the essential materials in the construction industry, is used to reinforce various building structures. With the continuous development of technology, the performance requirements for cement are also gradually increasing. After cement is ground, it is graded and screened to select cement of different particle sizes, and then the performance of the cement is improved by appropriate proportions.

[0003] Currently, after cement granules are ground, they are prone to sticking together due to varying storage and transportation conditions. Existing grading devices often use constant-speed feeding during the feeding process, which cannot pre-treat and separate the sticking particles, thus affecting the subsequent grading accuracy.

[0004] In addition, since cement granules are mostly in powder form, when there are too many cement granules, using a unidirectional grading structure, fine powder particles are easily mixed with coarse powder particles and settle, which can easily cause large errors during the grading process and affect the grading quality of cement particles. Summary of the Invention

[0005] The purpose of this invention is to provide a cement product particle size classification device to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a cement finished product particle size classification device.

[0007] A cement particle size classification device includes a feeding device, a grading device, a collecting device, and an induced draft fan. The feeding device and the grading device are connected by pipelines, the inlet of the induced draft fan is connected by a pipeline to the grading device, and the outlet of the induced draft fan is connected by a pipeline to the collecting device. The feeding device is used to break up the cement, and the grading device is used to perform internal circulation grading of the cement.

[0008] The feeding device is used to transport the finished cement product into the grading device for grading. After the grading is completed, the product is sent into the collection device by an induced draft fan to collect the fine cement particles. The coarse cement particles remain in the grading device and flow out from the discharge port at the bottom for easy collection. The grading device is used for internal circulation of cement to improve grading efficiency.

[0009] Furthermore, the feeding device includes a housing, a conveyor belt, and a roller. The housing is provided with a feeding chamber, the conveyor belt is arranged along the feeding chamber, and two tension rollers are provided on the inner ring of the conveyor belt. The two tension rollers are rotatably connected to the inner wall of the feeding chamber. The roller is located on the upper side of the conveyor belt, and a feeding gap is provided on the upper surface of the roller and the conveyor belt. The roller and the tension roller are set with the same diameter, and the roller rotates faster than the tension roller. A booster fan is provided at one end of the housing near the discharge port, and the inlet of the booster fan is connected to the feeding chamber.

[0010] The grading device includes a feed pipe and a cylinder. The outlet of the booster fan is connected to the feed pipe. The cylinder is provided with a working chamber. The end of the feed pipe away from the booster fan is inserted into the working chamber.

[0011] Cement granules are fed into the feeding chamber on the shell through a pipeline and fall onto the conveyor belt. The conveyor belt is driven by friction through two tension rollers on the inner ring. The grinding roller is positioned on the upper side of the conveyor belt, maintaining a feeding gap between it and the upper surface of the belt. During cement conveying, a motor drives the grinding roller and tension roller to rotate, ensuring that the linear velocity of the cement moving with the grinding roller is faster than that moving with the conveyor belt. Through this differential motion, if the cement clumps together, the grinding roller moves the upper side of the clumps forward, breaking up the adhered cement clumps and improving the accuracy of subsequent particle grading. The cement granules broken up by the differential speed are pressurized and conveyed by a booster fan and directly transported into the working chamber through the feed pipe for easy cement separation.

[0012] Furthermore, the grading device also includes a dispersant, a classifying wheel, and a drive motor. The drive motor is fastened to the cylinder, the output end of the drive motor is inserted into the working chamber, and the output end of the drive motor is fastened to the classifying wheel. The dispersant is built into the working chamber and is located between the feed pipe and the classifying wheel. The blower and part of the working chamber pipe above the classifying wheel are connected.

[0013] The classifying wheel includes two mounting plates with several blades between them. A dispersant further disperses the initially dispersed cement. Cement airflow, pressurized by a booster fan, impacts the dispersant in the feed pipe, further dispersing it through the force of the impact. The negative pressure section of the induced draft fan is connected to the working chamber, located at the upper end of the classifying wheel, creating a negative pressure. Under this pressure difference, the cement airflow impacts the dispersant. Coarse powder, due to its greater weight, experiences less pressure from the pressure difference than its own weight. It is redirected by the dispersant, impacting the working chamber wall and falling, then collected through the outlet at the bottom of the working chamber. Fine powder, under the pressure difference, floats upwards along the working chamber and passes through the gap of the classifying wheel driven by the drive motor, entering the upper layer of the working chamber and being guided into the receiving cylinder by the induced draft fan.

[0014] Furthermore, the dispersant includes a material tray and a guide ring. The lower part of the material tray is set in an inverted cone shape. Several supports are provided on the material tray, and the ends of the supports away from the material tray are fastened to the inside of the guide ring. The cylinder is provided with annular grooves, and the guide ring is rotatably connected to the annular grooves. Several material guide grooves are provided on the material tray, and the material guide grooves are arranged in a spiral.

[0015] The grading device also includes a baffle, which is arc-shaped with a larger upper diameter than a lower diameter. The baffle is located below the guide ring and is fastened to the working chamber wall.

[0016] The disperser is designed as a separate unit. The material distribution disc includes an upper conical section and a lower inverted conical section, facilitating uniform impact during cement airflow. A spiral guide chute on the disc causes lateral force on its upper wall, rotating the disc. The disc is connected to a circumferentially arranged support and guide ring, which is positioned within a groove for rotational support. During material distribution, the disc's rotation creates centrifugal force on the cement airflow, increasing its density and efficiency. The high degree of dispersion facilitates grading. By setting baffles, when the cement airflow redirected by the material distribution plate impacts the working chamber wall, it falls under gravity and flows along the inner ring of the annular baffles. A certain distance is set between the bottom of the baffles and the outlet of the feed pipe, so that most of the coarse powder falls from this distance under gravity, which is convenient for classification and collection. Since the cement airflow sprayed from the feed pipe is in a jet state, the pressure here is low, which entrains the cement guided by the baffles, allowing the fine powder to circulate internally. Through internal circulation, the grading quality is improved.

[0017] Furthermore, the feed pipe output section is provided with a shrinking orifice, a horizontal flow channel and an expanding orifice in sequence along the feeding direction. The diameter of the shrinking orifice is gradually reduced along the internal medium flow direction, the diameter of the expanding orifice is gradually increased along the internal medium flow direction, and a return flow channel is provided on the outer ring of the horizontal flow channel.

[0018] Through the sequential arrangement of shrinkage orifices, horizontal flow channels, and expansion orifices, a Venturi-like tube is formed by varying the diameter. By creating negative pressure in the return flow channel, the fine powder is guided by negative pressure and re-impacted onto the bulk material tray for cement grading.

[0019] Furthermore, the collection device includes a collection cylinder and a light detection assembly. The outlet of the blower and the collection cylinder are connected. The cylinder is provided with a light detection slot. The light detection assembly is placed in the light detection slot. The light detection assembly includes a parallel light source and a base plate. The parallel light source and the base plate are respectively placed on both sides of the light detection slot. The base plate is provided with a photosensitive layer. Two electrodes are provided in the photosensitive layer. The two electrodes are respectively connected to two terminals of the power supply.

[0020] By setting up a photodetector, the density of fine powder passing through instantaneously is detected. The higher the density of fine powder, the lower the light intensity illuminating the photosensitive layer through the parallel light source, which means fewer electron-hole pairs are excited. The circuit formed by the two electrodes and the power supply has a smaller circuit current. When the density of fine powder decreases, the light intensity illuminating the photosensitive layer increases, the number of excited electron-hole pairs increases, and the circuit current increases, thereby enabling real-time detection of fine powder particles passing through the photodetector.

[0021] As an optimization, the two electrodes and the power supply are electrically connected to form a photodetector circuit, and the induced draft fan and the photodetector circuit are electrically connected. The receiving cylinder has a built-in filter component, which can be in the form of a filter plate or a filter bag for filtration. During fine powder settling, the amount of fine powder settled at one time is relatively fixed. When the density of the fine powder increases, more fine powder is pumped at one time, the current of the photodetector circuit decreases, and the output power of the induced draft fan is reduced; conversely, the output power of the induced draft fan is increased, thereby ensuring uniform settling of the fine powder and preventing excessive instantaneous volume from causing fine powder to escape, or too low an instantaneous volume from reducing the settling efficiency.

[0022] As an optimization, the return flow channel inlet is arranged at an angle, facing the inner ring surface of the baffle. By tilting the inlet, the return flow channel inlet is positioned at a lower level, preventing the adsorption of coarse powder and primarily serving to circulate fine powder internally, thereby improving the classification quality.

[0023] Compared with the prior art, the beneficial effects achieved by this invention are as follows: During cement conveying, the invention uses a motor drive to rotate the grinding roller and tension roller, ensuring that the linear velocity of the cement movement driven by the grinding roller is faster than that driven by the conveyor belt. This differential motion causes the grinding roller to move the cement clumps forward, breaking up the adhered clumps and improving the accuracy of subsequent particle grading. Furthermore, the spiral-shaped guide chute on the material distribution disc causes a lateral force on the upper wall of the chute, which in turn drives the material distribution disc to rotate. The disc is connected to a circumferentially arranged support and a guide ring, which is positioned within the ring... Inside the trough, the material is rotated and supported. When the material is guided by the material tray, the centrifugal force caused by the rotation of the material tray increases the dispersion of the cement airflow, thus facilitating classification. By setting baffles, when the cement airflow redirected by the material tray hits the working chamber wall, it falls under the action of gravity and flows along the inner ring of the annular baffles. A certain distance is set between the bottom of the baffles and the outlet of the feed pipe, so that most of the coarse powder falls from this distance under the action of gravity, which is convenient for classification and collection. Since the cement airflow sprayed from the feed pipe is in a jet state, the pressure here is low, which entrains the cement guided by the baffles, allowing the fine powder to circulate internally. Through internal circulation, the classification quality is improved. Attached Figure Description

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, and the advantages of the present invention in the above and / or other aspects will become clearer.

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 This is a schematic diagram of the cement feeding structure of the present invention;

[0027] Figure 3 This is a schematic diagram of the cement grading structure of the present invention;

[0028] Figure 4 This is a schematic diagram of the cement diffusion structure of the present invention;

[0029] Figure 5 This is a schematic diagram of the graded wheel structure of the present invention;

[0030] Figure 6 yes Figure 4 A magnified view of a portion of the view;

[0031] Figure 7 yes Figure 4 A partial zoom-in view (B) of the view;

[0032] In the diagram: 1. Feeding device; 11. Shell; 12. Conveyor belt; 13. Tension roller; 14. Roller; 15. Booster fan; 2. Grading device; 21. Feed pipe; 211. Shrinking orifice; 212. Flow channel; 213. Expanding orifice; 214. Return flow channel; 22. Disperser; 221. Dispersing disc; 2211. Guide chute; 222. Support; 223. Guide ring; 23. Cylinder; 231. Working chamber; 232. Ring groove; 233. Detector groove; 24. Grading wheel; 25. Drive motor; 26. Baffle; 3. Collection device; 31. Collection cylinder; 32. Detector assembly; 321. Parallel light source; 322. Base plate; 323. Photosensitive layer; 324. Electrode; 4. Exhaust fan. Detailed Implementation

[0033] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0034] The present invention provides the following technical solution:

[0035] like Figure 1 As shown, a cement finished product particle size classification device includes a feeding device 1, a grading device 2, a collecting device 3, and an induced draft fan 4. The feeding device 1 and the grading device 2 are connected by pipelines. The inlet of the induced draft fan 4 is connected to the pipeline of the grading device 2, and the outlet of the induced draft fan 4 is connected to the collecting device 3. The feeding device 1 is used to disperse the cement, and the grading device 2 is used to perform internal circulation grading of the cement.

[0036] The feeding device 1 is used to convey the finished cement product into the grading device 2 for grading. After the grading is completed, it is sent into the collection device 3 by the blower 4 to collect the fine cement particles. The coarse cement particles remain in the grading device 2 and flow out from the discharge port at the bottom for easy collection. The grading device 2 is used for internal circulation of cement to improve grading efficiency.

[0037] like Figures 1-3 As shown, the feeding device 1 includes a housing 11, a conveyor belt 12, and a roller 14. The housing 11 is provided with a feeding chamber. The conveyor belt 12 is arranged along the feeding chamber. Two tension rollers 13 are provided on the inner ring of the conveyor belt 12. The two tension rollers 13 are rotatably connected to the inner wall of the feeding chamber. The roller 14 is located on the upper side of the conveyor belt 12. The upper surface of the roller 14 and the conveyor belt 12 is provided with a feeding gap. The roller 14 and the tension roller 13 are set with the same diameter. The roller 14 rotates faster than the tension roller 13. A booster fan 15 is provided at one end of the housing 11 near the discharge port. The inlet of the booster fan 15 is connected to the feeding chamber.

[0038] The grading device 2 includes a feed pipe 21 and a cylinder 23. The outlet of the booster fan 15 is connected to the feed pipe 21. The cylinder 23 is provided with a working chamber 231. The end of the feed pipe 21 away from the booster fan 15 is inserted into the working chamber 231.

[0039] Cement granules are fed into the feeding chamber on the housing 11 through a pipeline and fall onto the conveyor belt 12. The conveyor belt is driven by friction through two tension rollers 13 on the inner ring. A grinding roller 14 is placed on the upper side of the conveyor belt 12, with a feeding gap maintained between it and the upper surface of the conveyor belt 12. During cement conveying, a motor drives the grinding roller 14 and the tension roller 13 to rotate, so that the linear speed at which the grinding roller 14 moves the cement is faster than that at which the conveyor belt 12 moves the cement. Through differential motion, if the cement clumps together, the grinding roller 14 moves the upper side of the clumps forward, breaking up the cement clumps and improving the accuracy of subsequent particle grading. The cement granules broken up by differential speed are pressurized and conveyed by a booster fan 15 and directly transported into the working chamber 231 through the feed pipe 21 for cement separation.

[0040] like Figures 3-5 As shown, the grading device 2 also includes a dispersant 22, a classifying wheel 24, and a drive motor 25. The drive motor 25 is fastened to the cylinder 23. The output end of the drive motor 25 is inserted into the working chamber 231. The output end of the drive motor 25 is fastened to the classifying wheel 24. The dispersant 22 is built into the working chamber 231. The dispersant 22 is located between the feed pipe 21 and the classifying wheel 24. The blower 4 and the part of the working chamber 231 above the classifying wheel 24 are connected.

[0041] The classifying wheel 24 includes two mounting plates with several blades between them. A disperser 22 further disperses the initially dispersed cement. Cement airflow, pressurized and conveyed by the booster fan 15 within the feed pipe 21, impacts the disperser 22, further dispersing it through the force of the impact. The negative pressure section of the induced draft fan 4 is connected to the working chamber 231, with the connection point located at the upper end of the classifying wheel 24. This creates a negative pressure at the upper end of the classifying wheel 24. Under the pressure difference, the cement airflow impacts the disperser 22. Coarse powder, due to its greater weight, experiences less pressure from the pressure difference than its own weight. After being redirected by the disperser 22, it impacts the wall of the working chamber 231 and falls, being collected through the outlet at the bottom of the working chamber 231. Fine powder, under the pressure difference, floats upwards along the working chamber 231 and passes through the gap of the classifying wheel 24 driven by the drive motor 25, entering the upper layer of the working chamber 231 and being introduced into the receiving cylinder 31 by the induced draft fan 4.

[0042] like Figures 3-4 As shown, the disperser 22 includes a material tray 221 and a guide ring 223. The lower part of the material tray 221 is set in an inverted cone shape. Several supports 222 are provided outward from the material tray 221. The ends of the supports 222 away from the material tray 221 are fastened to the inside of the guide ring 223. The cylinder 23 is provided with an annular groove 232. The guide ring 223 and the annular groove 232 are rotatably connected. Several guide grooves 2211 are provided on the material tray 221. The guide grooves 2211 are spirally arranged.

[0043] The gradation device 2 also includes a baffle 26, which is arc-shaped. The diameter of the upper end of the baffle 26 is larger than that of the lower end. The baffle 26 is located below the guide ring 223 and is fastened to the wall of the working chamber 231.

[0044] The material dispersant 22 is a separate unit. The material distribution plate 221 includes a cone at the top and an inverted cone at the bottom, which facilitates uniform impact during cement airflow. The material distribution plate 221 has a spiral guide groove 2211. When the airflow impacts the guide groove 2211, the upper wall of the guide groove 2211 experiences a lateral force, causing the material distribution plate 221 to rotate. The material distribution plate 221 is connected to a circumferentially arranged bracket 222 and a guide ring 223. The guide ring 223 is placed within a ring groove 232 for rotational support. During material distribution, the rotation of the material distribution plate 221 causes centrifugal force. The cement airflow is subjected to centrifugal force, which improves the dispersion and facilitates grading. By setting baffle 26, when the cement airflow diverted by the material distribution plate 221 hits the wall of the working chamber 231, it falls under the action of gravity and flows along the inner circle of the annular baffle 26. A certain distance is set between the bottom end of the baffle 26 and the outlet of the feed pipe 21, so that most of the coarse powder falls from this distance under the action of gravity, which is convenient for classification and collection. Since the cement airflow sprayed by the feed pipe 21 is in a jet state, the pressure here is low, which entrains the cement guided by the baffle 26, allowing the fine powder to circulate internally. Through internal circulation, the grading quality is improved.

[0045] like Figure 6 As shown, the feed pipe 21 output section is provided with a shrinking orifice 211, a horizontal flow channel 212 and an expanding orifice 213 in sequence along the feeding direction. The diameter of the shrinking orifice 211 is gradually reduced along the internal medium flow direction, and the diameter of the expanding orifice 213 is gradually expanded along the internal medium flow direction. A return flow channel 214 is provided on the outer ring of the horizontal flow channel 212.

[0046] Through the sequential arrangement of the shrinkage orifice 211, the horizontal flow channel 212, and the expansion orifice 213, a Venturi-like tube is formed by the change in diameter. By creating negative pressure in the return flow channel 214, the fine powder is guided by negative pressure and re-impacted onto the bulk material plate 221 for cement classification.

[0047] like Figure 4 , Figure 7 As shown, the collecting device 3 includes a receiving cylinder 31 and a light detection component 32. The outlet of the blower 4 is connected to the receiving cylinder 31 via a pipe. A light detection groove 233 is provided on the cylinder body 23. The light detection component 32 is placed in the light detection groove 233. The light detection component 32 includes a parallel light source 321 and a base plate 322. The parallel light source 321 and the base plate 322 are respectively placed on both sides of the light detection groove 233. The base plate 322 is provided with a photosensitive layer 323. Two electrodes 324 are provided in the photosensitive layer 323. The two electrodes 324 are respectively connected to two terminals of the power supply.

[0048] By setting up the detector 233, the density of fine powder passing through instantaneously is detected. The higher the density of fine powder, the lower the light intensity irradiated on the photosensitive layer 323 by the parallel light source 321, that is, the fewer electron-hole pairs are excited. The two electrodes 324 and the power supply form a circuit, and the circuit current is smaller. When the density of fine powder decreases, the light intensity irradiated on the photosensitive layer 323 increases, the number of excited electron-hole pairs increases, and the circuit current increases, thereby enabling real-time detection of fine powder particles passing through the detector 233.

[0049] As an optimization, the two electrodes 324 and the power supply are electrically connected to form a light detection circuit, and the blower 4 is electrically connected to the light detection circuit. The receiving cylinder 31 has a built-in filter component, which can be a filter plate or a filter bag for filtration. During fine powder settling, the amount of fine powder settled at one time is relatively fixed. When the density of fine powder increases, more fine powder is pumped at one time, the current of the light detection circuit decreases, and the output power of the blower 4 is reduced; conversely, the output power of the blower 4 is increased, thereby making the fine powder settle evenly and preventing the fine powder from escaping due to excessive instantaneous amount, or the settling efficiency from being reduced due to excessive instantaneous amount.

[0050] As an optimization, the inlet of the return flow channel 214 is arranged at an angle, facing the inner annular surface of the baffle 26. By setting it at an angle, the inlet of the return flow channel 214 is at a low position, avoiding the adsorption of coarse powder, and is mainly used for internal circulation of fine powder, thereby improving the classification quality.

[0051] The working principle of this invention is as follows: During cement conveying, a motor drive is used to rotate the grinding roller 14 and the tension roller 13. This ensures that the linear velocity of the cement moving with the grinding roller 14 is faster than that of the conveyor belt 12. Through this differential motion, if the cement clumps together, the grinding roller 14 moves the upper side of the clumps forward, breaking up the adhered cement clumps and improving the accuracy of subsequent particle grading. The material guide trough 2211 on the material distribution disc 221, being spiral-shaped, causes a lateral force on the upper wall of the guide trough 2211 when airflow impacts it, thus rotating the material distribution disc 221. The material distribution disc 221 is connected to a circumferentially arranged bracket 222 and a guide ring 223. The guide ring 223 is positioned... Within the annular groove 232, rotational support is provided. When the material is guided by the material distribution disc 221, the centrifugal force caused by the rotation of the disc 221 increases the dispersion of the cement airflow, thus facilitating grading. Baffles 26 are installed so that when the cement airflow redirected by the material distribution disc 221 impacts the wall of the working chamber 231, it falls under gravity and flows along the inner ring of the annular baffles 26. A certain distance is set between the bottom of the baffles 26 and the outlet of the feed pipe 21, allowing most of the coarse powder to fall through this distance under gravity, facilitating classified collection. Because the cement airflow ejected from the feed pipe 21 is in a jet state, the pressure is low here, causing the cement guided by the baffles 26 to be drawn in, allowing the fine powder to circulate internally, thus improving the grading quality.

[0052] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A particle size classification device for finished cement products, characterized in that: The grading device includes a feeding device (1), a grading device (2), a collecting device (3), and an induced draft fan (4). The feeding device (1) and the grading device (2) are connected by pipes. The inlet of the induced draft fan (4) is connected to the grading device (2) by pipes. The outlet of the induced draft fan (4) is connected to the collecting device (3). The feeding device (1) is used to break up the cement. The grading device (2) is used to perform internal circulation grading of the cement. The feeding device (1) includes a housing (11), a conveyor belt (12), and a roller (14). The housing (11) is provided with a feeding chamber. The conveyor belt (12) is arranged along the feeding chamber. Two tension rollers (13) are provided in the inner ring of the conveyor belt (12). The two tension rollers (13) are rotatably connected to the inner wall of the feeding chamber. The roller (14) is located on the upper side of the conveyor belt (12). The roller (14) and the upper surface of the conveyor belt (12) are provided with a feeding gap. The roller (14) and the tension roller (13) are set with the same diameter. The roller (14) rotates faster than the tension roller (13). A booster fan (15) is provided at one end of the housing (11) near the discharge port. The inlet of the booster fan (15) is connected to the feeding chamber. The grading device (2) includes a feed pipe (21) and a cylinder (23). The outlet of the booster fan (15) is connected to the feed pipe (21). The cylinder (23) is provided with a working chamber (231). The end of the feed pipe (21) away from the booster fan (15) is inserted into the working chamber (231). The grading device (2) also includes a dispersant (22), a classifying wheel (24), and a drive motor (25). The drive motor (25) is fastened to the cylinder (23). The output end of the drive motor (25) is inserted into the working chamber (231). The output end of the drive motor (25) is fastened to the classifying wheel (24). The working chamber (231) contains the dispersant (22). The dispersant (22) is located between the feed pipe (21) and the classifying wheel (24). The blower (4) and the part of the working chamber (231) above the classifying wheel (24) are connected by pipes. The dispersant (22) includes a material tray (221) and a guide ring (223). The lower part of the material tray (221) is set in an inverted cone shape. Several supports (222) are provided on the material tray (221) and spread outward. The ends of the supports (222) away from the material tray (221) are fastened to the inside of the guide ring (223). The cylinder (23) is provided with an annular groove (232). The guide ring (223) and the annular groove (232) are rotatably connected. Several guide grooves (2211) are provided on the material tray (221). The guide grooves (2211) are arranged spirally. The gradation device (2) also includes a baffle (26), which is arc-shaped. The upper diameter of the baffle (26) is larger than the lower diameter. The baffle (26) is located below the guide ring (223). The baffle (26) and the working chamber (231) wall are fastened together. The feed pipe (21) output section is provided with a shrinkage orifice (211), a horizontal flow channel (212) and an expansion orifice (213) in sequence along the feeding direction. The diameter of the shrinkage orifice (211) is gradually reduced along the internal medium flow direction, and the diameter of the expansion orifice (213) is gradually expanded along the internal medium flow direction. The outer ring of the horizontal flow channel (212) is provided with a return flow channel (214).

2. The cement finished product particle size classification device according to claim 1, characterized in that: The collecting device (3) includes a receiving cylinder (31) and a light detection component (32). The outlet of the blower (4) is connected to the pipe of the receiving cylinder (31). The cylinder (23) is provided with a light detection groove (233). The light detection component (32) is placed in the light detection groove (233). The light detection component (32) includes a parallel light source (321) and a base plate (322). The parallel light source (321) and the base plate (322) are respectively placed on both sides of the light detection groove (233). The base plate (322) is provided with a photosensitive layer (323). The photosensitive layer (323) is provided with two electrodes (324). The two electrodes (324) are respectively connected to two terminals of the power supply.

3. The cement finished product particle size classification device according to claim 2, characterized in that: The two electrodes (324) and the power supply are electrically connected to form a light detection circuit, and the fan (4) is electrically connected to the light detection circuit.

4. A cement product particle size classification device according to claim 3, characterized in that: The inlet of the return flow channel (214) is arranged at an angle, and the inlet of the return flow channel (214) faces the inner ring surface of the baffle (26).

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