A layered screening device for flour processing

Abstract

This invention relates to the field of flour processing technology and proposes a layered screening device for flour processing. The device includes a housing with a feed hopper fixedly connected to the top. A screening mechanism is located inside the feed hopper, comprising two inclined first guide frames. Each of the two first guide frames has a first movable seat slidably connected to its end. A first screen plate is fixedly connected to the top of each first movable seat. Below the first guide frames are two second guide frames, each with a second movable seat slidably connected to its end. A second screen plate is fixedly connected to the top of each second movable seat. A driving component is located inside the housing. A receiving mesh frame is located at the bottom of the second screen plate, and a collection box is located below the receiving mesh frame. A slag discharge mechanism is located at the outlet end of the receiving mesh frame. This invention solves the problem of screening blockage by combining double-layer vibrating screening with fixed toothed crushing.

Description

Technical Field

[0001] This invention relates to the field of flour processing technology, and more specifically, to a layered screening device for flour processing. Background Technology

[0002] In the flour processing industry, screening (sieving) is a crucial post-processing step. Its main purpose is to classify the ground material according to particle size, separate out flour that meets the requirements, and remove bran, coarse particles, or other impurities. Efficient screening can directly improve the purity, fineness, and final product quality of the flour.

[0003] Existing commonly used flour screening devices (such as vibrating screens, flat rotary screens, and high square screens) typically have the following shortcomings in practical applications: First, flour with slightly higher moisture content is prone to clumping during the sieving process. Most existing sieving equipment relies solely on the vibration of the screen and lacks a mechanism to actively break up the clumps. These clumps will clog the screen holes, severely reducing the effective sieving area and sieving rate, resulting in decreased sieving efficiency and requiring frequent shutdowns for cleaning, which affects continuous production. Secondly, the existing screening equipment uses a simple single-layer screen or screen combination method, and the material is screened only once or a limited number of times. This may result in imprecise grading, and some particles of intermediate size may not be effectively separated, affecting the uniformity and extraction rate of flour. Third, the bran and other residues left after screening often contain fine flour particles that were not completely removed. Existing equipment often discharges the residues directly, resulting in flour waste (reduced yield). At the same time, the discharge process lacks effective dust control, which can easily generate dust. This not only causes material loss but also pollutes the workshop environment, endangers workers' health, and poses a safety hazard of dust explosion.

[0004] In view of this, the present invention proposes a layered screening device for flour processing. Summary of the Invention

[0005] This invention proposes a layered screening device for flour processing, which solves the problem of screen clogging caused by flour clumping in the prior art.

[0006] The technical solution of the present invention is as follows: A layered screening device for flour processing includes a box body, a feeding hopper fixedly connected to the top of the box body, a screening mechanism provided on the inner side of the feeding hopper, the screening mechanism including two inclined first guide frames fixedly connected to the inner wall of the box body, a first movable seat slidably connected to both ends of the two first guide frames, a first sieve plate fixedly connected to the top of the first movable seat and parallel to the first guide frame, two second guide frames fixedly connected to the inner wall of the box body are inclinedly arranged below the first guide frames, a second movable seat slidably connected to both ends of the two second guide frames, a second sieve plate fixedly connected to the top of the second movable seat and parallel to the second guide frame, and a driving member for driving the first movable seat and the second movable seat to slide back and forth on the inner side of the box body; The bottom end of the second sieve plate is provided with a receiving mesh frame for receiving slag and fixedly connected to the inner wall of the box. Below the receiving mesh frame is a collecting box for collecting flour. The outlet end of the receiving mesh frame is provided with a slag discharge mechanism for discharging slag.

[0007] Preferably, the first guide frame and the second guide frame have opposite tilting directions and the same tilt angle.

[0008] Preferably, the driving component includes a first rotating shaft and a second rotating shaft arranged in parallel. The first rotating shaft and the second rotating shaft are rotatably connected to the inner side of the housing. Cams are fixedly connected to both ends of the first rotating shaft and the second rotating shaft. A connecting rod is rotatably connected to the outer edge of the cam. The end of the connecting rod away from the cam is rotatably connected to the corresponding first movable seat and second movable seat.

[0009] Preferably, the driving component further includes a first motor fixedly installed on the outside of the housing, the output shaft of the first motor being fixedly connected to a first rotating shaft, and a transmission pulley being fixedly connected to the middle of both the first rotating shaft and the second rotating shaft, with the two transmission pulleys connected by a belt drive.

[0010] Preferably, a crushing component is provided above both the first screen plate and the second screen plate. The crushing component includes a fixed plate fixedly connected to the inside of the box, an mounting plate fixedly connected to the bottom of the fixed plate, and a plurality of toothed nails fixedly connected to the bottom of the mounting plate, which move in conjunction with the first screen plate and the second screen plate to crush the agglomerated material.

[0011] Preferably, the slag discharge mechanism includes a slag discharge box fixedly connected to the outside of the box body and communicating with the inside of the receiving mesh frame. A second motor is fixedly installed at one end of the top of the slag discharge box, and a suction fan is fixedly installed at the other end of the top of the slag discharge box. The output shaft of the second motor is fixedly connected to the impeller shaft of the suction fan. A suction pipe is fixedly connected to the inlet end of the suction fan, and the inlet end of the suction pipe communicates with the inside of the slag discharge box. Two parallel electrostatic dust removal rods are rotatably connected to the inside of the slag discharge box. A first gear is fixedly connected to one end of each of the two electrostatic dust removal rods, and the two first gears mesh with each other. A transmission component is provided on one side of the slag discharge box to drive the electrostatic dust removal rods to rotate by cooperating with the starting of the second motor. A cleaning component is provided on the inside of the slag discharge box to clean the surface of the electrostatic dust removal rods by cooperating with the rotation of the electrostatic dust removal rods.

[0012] Preferably, the transmission component includes a first bevel gear fixedly connected to the output shaft of the second motor, a third rotating shaft rotatably connected to the slag discharge box, a second bevel gear fixedly connected to one end of the third rotating shaft, the second bevel gear meshing with the first bevel gear, a first pulley fixedly connected to the other end of the third rotating shaft, and a second pulley fixedly connected to one end of one of the electrostatic dust removal rods, the second pulley being connected to the first pulley via a belt drive.

[0013] Preferably, the ratio of the number of teeth of the first bevel gear to the number of teeth of the second bevel gear is 1:4.

[0014] Preferably, the cleaning component includes a pin rotatably connected to the inside of the slag discharge box, a scraper fixedly connected to the pin, the front end of the scraper abutting against the outer wall of the electrostatic dust removal rod, a torsion spring sleeved on one end of the pin, and the two ends of the torsion spring being welded to the scraper and the inner wall of the slag discharge box, respectively.

[0015] Preferably, the bottom end of the box is provided with a discharge port, and an operating door is hinged to the inner side of the discharge port.

[0016] The working principle and beneficial effects of this invention are as follows: 1. This invention features a first and second sieve plate with opposite inclination directions, forming a two-stage screening process. Materials pass through sieve plates of different mesh sizes in succession, enabling more effective separation of particles of different sizes, resulting in more thorough screening and improved flour uniformity and extraction rate. Both sieve plates are designed with inclination and combined with reciprocating vibration. Unscreened materials (clumps or residue) can automatically slide to the next stage or the discharge port under the action of vibration and their own gravity, achieving continuous and automatic material flow, reducing material jamming and manual intervention, and improving overall processing efficiency.

[0017] 2. This invention features a crushing component with toothed spikes fixedly installed above the first and second sieve plates. When the sieve plates vibrate, the clumps of material on them collide and scrape against the fixed toothed spikes, effectively breaking them up. This fundamentally solves the problem of clogging the sieve holes due to flour clumping from moisture, ensuring the effective screening area and screening rate, and reducing the need for downtime cleaning.

[0018] 3. The slag discharge mechanism of this invention integrates negative pressure suction and electrostatic adsorption technology. The suction fan generates negative pressure in the slag discharge box, sucking in the floating fine flour dust; the electrostatic dust removal rods then strongly adsorb these dust particles, separating them from the airflow and attaching them to the surface of the rods. This process can recover flour that would otherwise be wasted mixed in with the slag, directly improving flour yield and economic efficiency.

[0019] 4. This invention utilizes a transmission mechanism and a single motor to drive the electrostatic dust collector rods to rotate slowly. Combined with a scraper that remains in close contact with the rod surface under torsion spring pressure, the dust adsorbed on the rod's surface can be automatically and continuously scraped off during operation, causing it to fall to the bottom of the collection box for unified discharge. This ensures the continuous adsorption capacity of the dust collector rods, eliminating the need for manual cleaning by stopping the machine. This design significantly reduces the possibility of flour dust escaping from the device into the workshop air. This effectively reduces dust pollution in the workplace, improves the working environment for workers, and fundamentally reduces the safety risk of dust explosions. Attached Figure Description

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0021] Figure 1 This is a schematic diagram of the structure of a layered screening device for flour processing according to the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the structure of a layered screening device for flour processing according to the present invention. Figure 2 ; Figure 3 This is a partial cross-sectional view of a layered screening device for flour processing according to the present invention; Figure 4 This is a schematic diagram of the screening mechanism of the present invention; Figure 5 This is a schematic diagram of the structure of the driving component of the present invention; Figure 6 This is a schematic diagram of the structure of the crushing component of the present invention; Figure 7 This is a schematic diagram of the slag discharge mechanism of the present invention; Figure 8 This is a schematic diagram of the transmission component of the present invention; Figure 9 This is a schematic diagram of the cleaning component of the present invention.

[0022] In the diagram: 1. Housing; 2. Feed hopper; 3. Screening mechanism; 31. First guide frame; 32. First movable seat; 33. First screen plate; 34. Second guide frame; 35. Second movable seat; 36. Second screen plate; 37. Driving component; 371. First rotating shaft; 372. Second rotating shaft; 373. Cam; 374. Connecting rod; 375. Transmission pulley; 376. First motor; 38. Crushing component; 381. Fixed plate; 382. Mounting plate; 383. 4. Toothed nail; 5. Material receiving mesh frame; 6. Collection box; 7. Slag discharge mechanism; 8. Slag discharge box; 9. Second motor; 10. Fan; 11. First gear; 12. Suction pipe; 13. Electrostatic dust removal rod; 24. Transmission component; 15. First bevel gear; 26. Third rotating shaft; 37. Second bevel gear; 48. First pulley; 59. Second pulley; 60. Cleaning component; 11. Pin shaft; 12. Scraper; 13. Torsion spring; 40. Operating door. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0024] like Figures 1 to 9 As shown, this embodiment proposes a layered screening device for flour processing, including a box 1, a feeding hopper 2 fixedly connected to the top of the box 1, a screening mechanism 3 provided inside the feeding hopper 2, a discharge port opened at the bottom of the box 1, and an operating door 7 hinged to the inside of the discharge port. The screening mechanism 3 includes two inclined first guide frames 31 fixedly connected to the inner wall of the housing 1. Each end of the two first guide frames 31 is slidably connected to a first movable seat 32. The top of each first movable seat 32 is fixedly connected to a first sieve plate 33 parallel to the first guide frame 31. Below the first guide frames 31, two inclined second guide frames 34 fixedly connected to the inner wall of the housing 1 are arranged. The first guide frames 31 and the second guide frames 34 are inclined in opposite directions, and their inclination angles are the same. The two ends of the second guide frames 34... The first movable seat 32 and the second movable seat 35 are slidably connected to each other. The top of the second movable seat 35 is fixedly connected to a second sieve plate 36 that is parallel to the second guide frame 34. The inner side of the box body 1 is provided with a driving component 37 for driving the first movable seat 32 and the second movable seat 35 to slide back and forth. The bottom end of the second sieve plate 36 is provided with a receiving mesh frame 4 for receiving slag and fixedly connected to the inner wall of the box body 1. The bottom of the receiving mesh frame 4 is provided with a collecting box 5 for collecting flour. The outlet end of the receiving mesh frame 4 is provided with a slag discharge mechanism 6 for discharging slag.

[0025] In this embodiment, flour is fed into the housing 1 through the feed hopper 2, and first falls onto the first sieve plate 33 supported by the first guide frame 31 and the first movable seat 32. The drive unit 37 operates, driving the first movable seat 32 to slide back and forth along the inclined first guide frame 31, thereby causing the first sieve plate 33 to vibrate back and forth. During this process, flour particles that meet the aperture requirements of the first sieve plate 33 are sieved down, while larger lumps or impurities remain on the first sieve plate 33 and slide towards the lower end due to its inclined setting, finally falling onto the second sieve plate 36 set below. The second sieve plate 36 is driven by the drive unit. Driven by 37, the second movable seat 35 slides back and forth along the second guide frame 34 for secondary screening. The qualified flour that has been screened by the second screen plate 36 falls through the screen holes, while the remaining residue remains on the second screen plate 36. All the screened flour eventually falls into the collection box 5 at the bottom, while the residue on the second screen plate 36 is guided to the receiving mesh frame 4 below it. The receiving mesh frame 4 allows a small amount of flour that may be mixed in to fall down and transports the main residue to the slag discharge mechanism 6 at its outlet end for centralized processing and discharge. The operating door 7 at the bottom of the box 1 is used to open and take out the collection box full of flour. This design utilizes a first screen plate 33 and a second screen plate 36, both tilted and with controllable vibration direction. Material undergoes two separate screenings, improving screening accuracy and thoroughness, and more effectively separating particles and impurities of different sizes. The tilted screen plates allow unscreened material to automatically slide to the next screen surface or discharge port under vibration and gravity, achieving continuous automatic material flow and improving processing efficiency. The collection paths for flour and residue are separated (flour enters collection box 5, residue enters receiving mesh frame 4) for convenient separate processing.

[0026] In a further preferred embodiment of the present invention, the driving component 37 includes a first rotating shaft 371 and a second rotating shaft 372 arranged in parallel. The first rotating shaft 371 and the second rotating shaft 372 are both rotatably connected to the inner side of the housing 1. Cams 373 are fixedly connected to both ends of the first rotating shaft 371 and the second rotating shaft 372. A connecting rod 374 is rotatably connected to the outer edge of the cam 373. The end of the connecting rod 374 away from the cam 373 is rotatably connected to the corresponding first movable seat 32 and second movable seat 35. A first motor 376 is fixedly installed on the outer side of the housing 1. The output shaft of the first motor 376 is fixedly connected to the first rotating shaft 371. A transmission pulley 375 is fixedly connected to the middle of the first rotating shaft 371 and the second rotating shaft 372. The two transmission pulleys 375 are connected by belt drive.

[0027] In this embodiment, the first motor 376 starts, driving the first rotating shaft 371 and the cams 373 at both ends to rotate. Through the transmission pulley 375 and belt, the second rotating shaft 372 rotates synchronously. The rotational motion of each cam 373 is converted into linear reciprocating motion at the other end of the connecting rod 374, which is rotatably connected to it. Since this end of the connecting rod 374 is rotatably connected to the first movable seat 32 or the second movable seat 35, it drives the movable seat and the screen plate (first screen plate 33 or second screen plate 36) fixed on it to perform precise reciprocating sliding along the corresponding guide frame (first guide frame 31 or second guide frame 34). The coordinated work of the two pairs of cams 373 and connecting rods 374 ensures that both the upper and lower screen plates receive stable and synchronous driving force for vibratory screening. The cam 373-linkage 374 mechanism of this design can stably convert rotary motion into linear reciprocating motion, providing a definite stroke and frequency for the screen plate and ensuring the effectiveness of the screening action. Through a first rotating shaft 371, a second rotating shaft 372, and a simple combination of transmission pulley 375 and belt, a first motor 376 can simultaneously drive four movable seats (two first movable seats 32 and two second movable seats 35), realizing the synchronization of the movement of the upper and lower screen plates, simplifying the drive system, and reducing energy consumption and cost.

[0028] In a further preferred embodiment of the present invention, a crushing component 38 is provided above both the first screen plate 33 and the second screen plate 36. The crushing component 38 includes a fixing plate 381 fixedly connected to the inside of the housing 1. A mounting plate 382 is fixedly connected to the bottom of the fixing plate 381. A plurality of toothed nails 383 are fixedly connected to the bottom of the mounting plate 382, ​​which are used to crush agglomerated materials by cooperating with the movement of the first screen plate 33 and the second screen plate 36.

[0029] In this embodiment, when the first sieve plate 33 or the second sieve plate 36 slides back and forth at high speed under the drive of the drive member 37, the material on the sieve plate (especially the clump of flour) will move accordingly. During this process, the clump of material will continuously collide with and scrape the fixed toothed nails 383. The blocking and cutting effect of the toothed nails 383 can effectively break up and crush the clump of material, making it smaller and thus easier to pass through the mesh of the sieve plate. This design mechanically breaks up flour lumps through the relative action of the moving screen plate and the fixed toothed nail 383, solving the problem of material clumping and clogging the screen holes due to moisture and other reasons, which affects screening efficiency and accuracy. The crushing component 38 itself is fixed and does not require a motor or drive device. Its crushing function is achieved entirely by utilizing the vibration energy of the screen plate itself, which is energy-saving and has a simple structure.

[0030] In a further preferred embodiment of the present invention, the slag discharge mechanism 6 includes a slag discharge box 61 fixedly connected to the outside of the box body 1 and communicating with the inside of the receiving mesh frame 4. A second motor 62 is fixedly installed at one end of the top of the slag discharge box 61, and a suction fan 63 is fixedly installed at the other end of the top of the slag discharge box 61. The output shaft of the second motor 62 is fixedly connected to the impeller shaft of the suction fan 63. A suction pipe 65 is fixedly connected to the inlet end of the suction fan 63. The inlet end of the suction pipe 65 communicates with the inside of the slag discharge box 61. Two parallel electrostatic dust removal rods 66 are rotatably connected to the inside of the slag discharge box 61. A first gear 64 is fixedly connected to one end of each of the two electrostatic dust removal rods 66. The two first gears 64 mesh with each other. A transmission component 67 is provided on one side of the slag discharge box 61 to drive the electrostatic dust removal rods 66 to rotate by cooperating with the start of the second motor 62. A cleaning component 68 is provided on the inside of the slag discharge box 61 to clean the surface of the electrostatic dust removal rods 66 by cooperating with the rotation of the electrostatic dust removal rods 66.

[0031] In this embodiment, the second motor 62 is started, which simultaneously drives the impeller shaft of the suction fan 63. The suction fan 63 operates, generating negative pressure (suction) within the slag discharge box 61 through the suction pipe 65. This negative pressure, on the one hand, draws in the fine flour dust mixed with the slag during the screening process into the slag discharge box 61, preventing it from escaping and causing waste and pollution; on the other hand, it helps guide the slag to gather towards the discharge port. Simultaneously, the electrostatic dust removal rods 66 installed inside the slag discharge box 61 are energized, generating an electrostatic field on their surface. This field strongly adsorbs the flour dust drawn into the slag discharge box 61, causing it to adhere to the rod surface, thus achieving gas-solid separation. Clean air may be discharged or circulated through the suction fan 63. The electrostatic dust removal rods 66, with adsorbed dust, are driven to rotate slowly by the transmission component 67. The dust on their surface is scraped off by the cleaning component 68 and falls to the bottom of the slag discharge box 61, ultimately being discharged along with other slag. This design combines negative pressure suction and electrostatic adsorption technologies to efficiently capture and recover fine flour dust mixed in with the slag, significantly reducing flour loss during the slag discharge process, increasing flour yield, and providing economic benefits. The electrostatic dust removal rod 66 effectively prevents flour dust from escaping from the slag discharge port into the outside of the device or into the workshop air, reducing the risk of dust explosion and improving the cleanliness of the production environment, meeting environmental protection and safe production requirements.

[0032] In a further preferred embodiment of the present invention, the transmission component 67 includes a first bevel gear 671 fixedly connected to the output shaft of the second motor 62, a third rotating shaft 672 rotatably connected to the slag discharge box 61, a second bevel gear 673 fixedly connected to one end of the third rotating shaft 672, the second bevel gear 673 meshing with the first bevel gear 671, the gear ratio of the first bevel gear 671 to the second bevel gear 673 being 1:4, a first pulley 674 fixedly connected to the other end of the third rotating shaft 672, and a second pulley 675 fixedly connected to one end of one of the electrostatic dust removal rods 66, the second pulley 675 and the first pulley 674 being connected by belt drive.

[0033] In this embodiment, when the second motor 62 starts, its output shaft drives the first bevel gear 671 to rotate. The second bevel gear 673, which meshes with the first bevel gear 671, rotates accordingly, but its speed changes (gear ratio 1:4, which reduces speed and increases torque). The second bevel gear 673 drives the third shaft 672 to rotate, and the first pulley 674, which is fixed at the other end of the third shaft 672, rotates accordingly. Through belt drive, the first pulley 674 transmits power to the second pulley 675, which is fixed at one end of one of the electrostatic precipitators 66, thereby driving the electrostatic precipitator 66 to rotate. Since the first gears 64 at the ends of the two electrostatic precipitators 66 mesh with each other, when one electrostatic precipitator 66 rotates, it will drive the other electrostatic precipitator 66 to rotate synchronously in the opposite direction. The design, through a pair of meshing first gears 64, ensures that two parallel electrostatic dust removal rods 66 can rotate in opposite directions but at the same speed, so that their entire cylindrical surface can participate in the adsorption of dust and be scraped by the cleaning component 68, thereby improving the utilization rate and working efficiency of the dust removal rod surface.

[0034] In a further preferred embodiment of the present invention, the cleaning component 68 includes a pin 681 rotatably connected to the inner side of the slag discharge box 61, a scraper 682 fixedly connected to the pin 681, the front end of the scraper 682 abutting against the outer wall of the electrostatic dust removal rod 66, and a torsion spring 683 sleeved on one end of the pin 681, the two ends of the torsion spring 683 being welded to the scraper 682 and the inner wall of the slag discharge box 61 respectively.

[0035] In this embodiment, under the preload of the torsion spring 683, the front end of the scraper 682 is always pressed against the outer circumferential surface of the electrostatic precipitator rod 66. When the electrostatic precipitator rod 66 rotates slowly under the drive of the transmission component 67, the flour dust layer adhering to its surface rotates to the position of contact with the scraper 682. The sharp edge of the scraper 682 scrapes off the dust tightly adhering to the surface of the rod. The scraped dust falls into the bottom of the slag discharge box 61. The function of the torsion spring 683 is to provide a continuous and finely adjustable clamping force to ensure that even if there is a slight eccentricity or uneven diameter of the electrostatic precipitator rod 66 during manufacturing or installation, the scraper 682 can always maintain effective contact with it, ensuring the continuity and stability of the cleaning effect. This design can simultaneously and automatically scrape off the dust adsorbed on the surface of the electrostatic precipitator rod 66 during operation, without the need for manual cleaning by stopping the machine, thus ensuring the continuity and efficiency of the dust removal work.

[0036] Overall workflow: I. Initial Screening: The flour material to be processed enters the housing 1 through the top feed hopper 2 and first falls onto the first sieve plate 33, which is in an inclined state. At this time, the drive unit 37 works, specifically the first motor 376 starts, which drives the first rotating shaft 371 and the second rotating shaft 372 to rotate synchronously through the transmission pulley 375 and belt. The cams 373 at both ends of the two rotating shafts rotate, and push the first movable seat 32 and the second movable seat 35 respectively through the connecting rod 374, so that the first sieve plate 33 and the second sieve plate 36 slide (vibrate) at high speed along their respective first guide frame 31 and second guide frame 34. Under the vibration of the first sieve plate 33, fine flour particles smaller than its aperture are sieved down, while larger lumps, bran and other impurities remain on the sieve surface and gradually slide to the lower end due to the inclination of the sieve plate and the vibration. Secondary screening: Larger particles sliding off the first sieve plate 33 fall onto the second sieve plate 36, which is inclined in the opposite direction. The second sieve plate 36 vibrates synchronously under the drive of the drive unit 37, performing secondary screening. During this process, flour that meets the aperture requirements of the second sieve plate 36 is sieved down, while coarser material remains on the second sieve plate 36. At the same time, during the vibration of the first sieve plate 33 and the second sieve plate 36, the fixed toothed pins 383 above them collide and scrape against the moving material clumps, thereby breaking up and crushing the clumps of flour, making it easier for them to pass through the sieve holes and effectively preventing sieve blockage. III. Flour Collection: The qualified flour sieved from the first sieve plate 33 and the second sieve plate 36 passes through the mesh of the receiving frame 4 below the second sieve plate 36 and finally falls into the collection box 5 placed at the bottom, thus completing the collection of flour. IV. Waste Treatment: The residue remaining on the second sieve plate 36 is guided to the receiving mesh frame 4 below it under the action of vibration and tilting. While the receiving mesh frame 4 carries the residue, it allows a small amount of flour that may be mixed in to leak back into the collection box 5, while the residue is conveyed to the slag discharge mechanism 6 at its outlet end. The residue and dust raised during the screening process enter the slag discharge box 61. At this time, the slag discharge mechanism 6 is activated, and the specific working process is as follows: The second motor 62 drives the suction fan 63 to work, generating negative pressure suction in the slag discharge box 61. On the one hand, it guides the slag, and on the other hand, it sucks in the floating fine flour dust. The electrostatic dust removal rod 66 generates an electrostatic field on its surface, which strongly adsorbs the flour dust sucked into the slag discharge box 61. At the same time, the output of the second motor 62 drives one of the electrostatic dust removal rods 66 to rotate through the transmission components 67 (first bevel gear 671, second bevel gear 673, third rotating shaft 672, first pulley 674, belt and second pulley 675), and drives the other electrostatic dust removal rod 66 to rotate synchronously in the opposite direction through the meshing first gear 64. The dust layer adsorbed on the surface of the rotating electrostatic dust removal rod 66 is scraped off by the scraper 682, which is always in close contact with the surface of the rod under the action of the torsion spring 683, when it passes the cleaning component 68. The scraped dust falls into the bottom of the slag discharge box 61, collects with other slag, and is finally discharged from the device.

[0037] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A layered screening device for flour processing, comprising a housing (1), wherein a feed hopper (2) is fixedly connected to the top of the housing (1), characterized in that, A screening mechanism (3) is provided on the inner side of the feed hopper (2), and the screening mechanism (3) includes: Two inclined first guide frames (31) are fixedly connected to the inner wall of the box (1). Two first movable seats (32) are respectively slidably connected to both ends of the two first guide frames (31); A first sieve plate (33) is fixedly connected to the top of the first movable seat (32) and is arranged parallel to the first guide frame (31); Two second guide frames (34) are inclinedly arranged below the first guide frame (31) and fixedly connected to the inner wall of the box (1). Two second movable seats (35) are respectively slidably connected to both ends of the two second guide frames (34); A second sieve plate (36) is fixedly connected to the top of the second movable seat (35) and is arranged parallel to the second guide frame (34); A drive member (37) is disposed on the inner side of the housing (1) and is used to drive the first movable seat (32) and the second movable seat (35) to slide back and forth. The bottom end of the second sieve plate (36) is provided with a receiving mesh frame (4) for receiving slag and fixedly connected to the inner wall of the box (1). Below the receiving mesh frame (4) is a collecting box (5) for collecting flour. The outlet end of the receiving mesh frame (4) is provided with a slag discharge mechanism (6) for discharging slag.

2. The layered screening device for flour processing according to claim 1, characterized in that, The first guide frame (31) and the second guide frame (34) have opposite tilting directions and the same tilt angle.

3. The layered screening device for flour processing according to claim 1, characterized in that, The drive component (37) includes a first rotating shaft (371) and a second rotating shaft (372) arranged in parallel. The first rotating shaft (371) and the second rotating shaft (372) are rotatably connected to the inner side of the housing (1). Cams (373) are fixedly connected to both ends of the first rotating shaft (371) and the second rotating shaft (372). A connecting rod (374) is rotatably connected to the outer edge of the cam (373). The end of the connecting rod (374) away from the cam (373) is rotatably connected to the corresponding first movable seat (32) and second movable seat (35).

4. The layered screening device for flour processing according to claim 3, characterized in that, The drive unit (37) also includes a first motor (376) fixedly installed on the outside of the housing (1). The output shaft of the first motor (376) is fixedly connected to the first rotating shaft (371). The middle parts of the first rotating shaft (371) and the second rotating shaft (372) are both fixedly connected to a transmission pulley (375). The two transmission pulleys (375) are connected by belt drive.

5. A layered screening device for flour processing according to claim 1, characterized in that, Both the first screen plate (33) and the second screen plate (36) are provided with crushing components (38). The crushing components (38) include a fixing plate (381) fixedly connected to the inside of the box (1). The bottom of the fixing plate (381) is fixedly connected to an mounting plate (382). The bottom of the mounting plate (382) is fixedly connected to a plurality of toothed nails (383) that work together with the first screen plate (33) and the second screen plate (36) to crush the agglomerated material.

6. The layered screening device for flour processing according to claim 1, characterized in that, The slag discharge mechanism (6) includes a slag discharge box (61) fixedly connected to the outside of the box body (1) and communicating with the inside of the receiving mesh frame (4). A second motor (62) is fixedly installed at one end of the top of the slag discharge box (61), and a suction fan (63) is fixedly installed at the other end of the top of the slag discharge box (61). The output shaft of the second motor (62) is fixedly connected to the impeller shaft of the suction fan (63). A suction pipe (65) is fixedly connected to the inlet end of the suction fan (63). The inlet end of the suction pipe (65) is connected to the inside of the slag discharge box (61). The inner side of the slag box (61) is rotatably connected to two parallel electrostatic dust removal rods (66). One end of each of the two electrostatic dust removal rods (66) is fixedly connected to a first gear (64). The two first gears (64) mesh with each other. One side of the slag discharge box (61) is provided with a transmission component (67) that drives the electrostatic dust removal rods (66) to rotate by cooperating with the start of the second motor (62). The inner side of the slag discharge box (61) is provided with a cleaning component (68) that cleans the surface of the electrostatic dust removal rods (66) by cooperating with the rotation of the electrostatic dust removal rods (66).

7. A layered screening device for flour processing according to claim 6, characterized in that, The transmission component (67) includes a first bevel gear (671) fixedly connected to the output shaft of the second motor (62), a third shaft (672) rotatably connected to the slag discharge box (61), a second bevel gear (673) fixedly connected to one end of the third shaft (672), the second bevel gear (673) meshing with the first bevel gear (671), a first pulley (674) fixedly connected to the other end of the third shaft (672), and a second pulley (675) fixedly connected to one end of one of the electrostatic dust removal rods (66), the second pulley (675) and the first pulley (674) being connected by belt drive.

8. A layered screening device for flour processing according to claim 7, characterized in that, The ratio of the number of teeth of the first bevel gear (671) to the number of teeth of the second bevel gear (673) is 1:

4.

9. A layered screening device for flour processing according to claim 6, characterized in that, The cleaning component (68) includes a pin (681) rotatably connected to the inside of the slag discharge box (61). A scraper (682) is fixedly connected to the pin (681). The front end of the scraper (682) abuts against the outer wall of the electrostatic dust removal rod (66). A torsion spring (683) is sleeved on one end of the pin (681). The two ends of the torsion spring (683) are welded to the scraper (682) and the inner wall of the slag discharge box (61), respectively.

10. A layered screening device for flour processing according to claim 1, characterized in that, The bottom end of the box (1) is provided with a discharge port, and an operating door (7) is hinged to the inside of the discharge port.

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