Automatic screening device for spicy strip production raw materials
By coordinating the shaking sieve system and the reciprocating rotation system, the problems of low screening efficiency and poor accuracy in spicy strip production are solved, achieving efficient and automated screening, reducing the risk of manual intervention and equipment blockage, and meeting the screening needs of different products.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-18
- Publication Date
- 2026-04-03
AI Technical Summary
Existing spicy snack production equipment suffers from low screening efficiency, poor precision control, easy clogging, and insufficient automation, resulting in high labor costs and significant hygiene and safety hazards.
The system employs a coordinated linkage between a shaking screen system and a reciprocating rotation system. A dual-head motor drives the screen box to reciprocate intermittently, while a servo motor drives the reciprocating table to perform variable frequency and variable range motion, thereby achieving composite motion of the screen belt. Combined with air blowing cleaning and automatic switching of screening zones, this ensures screening accuracy and efficiency.
It improves screening efficiency, reduces manual intervention costs, ensures screening accuracy and equipment versatility, meets the fineness requirements of different products, and reduces screen clogging and accumulation problems.
Smart Images
Figure CN121776100A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of screening device technology, specifically to an automatic screening device for raw materials used in the production of spicy snacks. Background Technology
[0002] In the large-scale production of spicy strips, the fineness of chili powder screening is a crucial step in determining the uniformity of product texture, flavor release efficiency, and suitability for subsequent processing. Currently, the raw material screening devices used in the industry mainly rely on traditional vibrating screens, fixed-aperture drum screens, or semi-automatic belt screens. However, long-term practical production has gradually revealed multi-dimensional technical bottlenecks, making it difficult to meet the comprehensive demands of modern food industry for screening efficiency, precision control, automation, and equipment versatility. The existing technologies have the following problems: Existing devices mostly use vibration screening with a single vibration frequency and fixed amplitude or uniform speed belt conveyor screening mode. The movement trajectory of the raw material on the screen surface is fixed, which easily leads to local accumulation dead corners due to poor force uniformity. This causes some raw materials to fail to fully contact the screen holes. At the same time, in the single movement mode, fine raw materials are prone to continuous compression of the screen holes, causing blockage. Frequent manual shutdowns for cleaning are required, which seriously restricts screening efficiency and continuity. Existing devices lack a real-time cleaning mechanism for the screen surface. After screening, raw materials are easy to adhere to the screen holes or the surface of the screen belt, which not only affects the subsequent screening accuracy, but also requires manual disassembly and cleaning at regular intervals, increasing labor costs and posing food hygiene and safety hazards. Based on this, the present invention provides an automatic screening device for raw materials used in the production of spicy strips to solve the problems mentioned in the background art. Summary of the Invention
[0003] This invention addresses the technical problems existing in the prior art by providing an automatic screening device for raw materials used in the production of spicy snacks.
[0004] To achieve the above objectives, the technical solution adopted by this invention is: an automatic screening device for raw materials used in spicy snack production, comprising a frame and a screening box. It also includes a shaking screen system, which is used to intermittently and repeatedly change the angle between the frame and the screen box; Two rollers and two pressing rollers are rotatably mounted on a screen box. Each roller is connected to a first toothed belt, which is connected to the pressing rollers respectively. The rollers are linked by a second toothed belt. A screen belt is wound between the rollers. The screen belt has a set of screening zones. Each screening zone has screen holes that are equidistantly arranged. The screen holes in each screening zone have different diameters. Each pressing roller is equipped with a set of regularly distributed rubber protrusions that fit against the screen belt. Two tensioning systems are used to keep the screen belt taut; The reciprocating table is slidably installed on the screen box. An upper pressure roller and a lower pressure roller are rotatably installed on the reciprocating table. A guide slot that fits the screen belt is provided between the upper pressure roller and the lower pressure roller. A reciprocating drive system is used to drive a reciprocating table to move back and forth, and the reciprocating stroke and reciprocating frequency of the reciprocating table change periodically. The screening zone switching mechanism is used to change the relative position of each screening zone and the roller. The reciprocating rotary system is driven by a reciprocating table and drives the screen belt to move back and forth when the screen zone switching mechanism is not working.
[0005] As a preferred embodiment of the present invention, the shaking screen system includes a double-headed motor mounted on a frame, the screen box being hinged to the frame, and drive wheels mounted on both output shafts of the double-headed motor. Each drive wheel has two alternating first meshing sections and a first non-meshing section. A rotating shaft is rotatably mounted on the frame, and driven gears are mounted on the rotating shaft at positions corresponding to the two drive wheels. The two first meshing sections alternately mesh with the driven gears. Two eccentric wheels are mounted on the rotating shaft, and connecting rods are hinged to the eccentric positions of the two eccentric wheels. The other ends of the two connecting rods are hinged to the screen box.
[0006] As a preferred embodiment of the present invention, the central angles corresponding to the two first meshing sections are 120° and 80° respectively, the central angles corresponding to the two first non-meshing sections are both 80°, and the radius of the drive wheel is 5 to 7 times the radius of the driven gear.
[0007] As a preferred technical solution of the present invention, both tensioning systems include a first tensioning platform slidably connected to the screen box, a tensioning spring that is limited by the screen box is installed on the side of the first tensioning platform, and a tensioning roller is rotatably installed on the first tensioning platform, the roller surface of the tensioning roller being rolledly connected to the screen belt.
[0008] As a preferred technical solution of the present invention, the reciprocating drive system includes a servo motor mounted on the screen box, a transmission wheel mounted on the output shaft end of the servo motor, three second meshing sections and three second non-meshing sections alternately arranged on the transmission wheel, an internal rack plate mounted on the reciprocating table, the three second meshing sections alternately meshing with the internal rack plate, a return spring mounted on the bottom surface of the reciprocating table, and the other end of the return spring fixedly connected to the screen box.
[0009] As a preferred technical solution of the present invention, the central angles corresponding to the three second meshing sections in the clockwise direction are 50°, 60° and 70° respectively, and the central angles corresponding to the three second non-meshing sections are all 60°. The first meshing section, the second meshing section and the internal rack plate are all provided with an anti-impact protective coating, and the thickness of the anti-impact protective coating is 0.15mm.
[0010] As a preferred technical solution of the present invention, the reciprocating rotation system includes an outer rack plate mounted on a reciprocating table, a synchronous shaft rotatably mounted on the screen box, a synchronous gear meshing with the outer rack plate mounted on the synchronous shaft, and a third toothed belt drivingly connecting the synchronous shaft and one of the rollers.
[0011] As a preferred technical solution of the present invention, the screen area switching mechanism includes a conversion motor mounted on the screen box, an incomplete gear mounted on the output shaft end of the conversion motor, the center angle corresponding to the effective meshing section of the incomplete gear being 150°, a driven gear meshing with the incomplete gear mounted on one of the rollers, a second tensioning platform slidably connected to the screen box, an electric push rod mounted between the second tensioning platform and the screen box, a tensioning wheel rotatably mounted on the second tensioning platform, and the tensioning wheel being connected to a third toothed belt drive.
[0012] As a preferred technical solution of the present invention, fine material discharge nozzles and coarse material discharge nozzles are respectively installed on the screen box and at the position corresponding to the bottom of the screen belt. The screen belt is a thin strip of 304 stainless steel, and a PLC controller is installed on the frame.
[0013] As a preferred technical solution of the present invention, it further includes an air blowing pump installed on the fine material discharge nozzle, an air blowing channel is provided inside the upper pressure roller, a plurality of air blowing holes are provided on the upper pressure roller, the air blowing holes are connected to the air blowing channel, and a set of regularly distributed positioning protrusions that fit against the screen belt are installed on both the upper and lower pressure rollers, the positioning protrusions being made of rubber.
[0014] Compared with the prior art, the present invention has the following advantages: 1. This invention solves the problems of raw material accumulation, screen hole blockage, and low screening efficiency caused by the single screening mode in the prior art by the coordinated linkage of the shaking screen system and the reciprocating rotation system. The shaking screen system uses a double-headed motor to drive the drive wheel with different center angles in the first meshing section, which alternately meshes with the driven gear to drive the eccentric wheel to rotate. The connecting rod pulls the screen box to achieve intermittent reciprocating changes in the included angle. The radius ratio of the drive wheel to the driven gear can ensure stable driving force and make the swing amplitude and frequency of the screen box change periodically. At the same time, the reciprocating drive system uses a servo motor to drive the transmission wheel with three different center angles in the second meshing section, which cooperates with the internal rack plate to drive the reciprocating table to perform reciprocating motion with variable stroke and frequency. The external rack plate on the side of the reciprocating table drives the winding roller through the synchronous gear, synchronous shaft, and third toothed belt. The rotation of the screen belt enables its reciprocating movement. This dual-dimensional coordinated motion of the screen box oscillation and the screen belt reciprocating creates an irregular composite motion trajectory for the raw material on the screen belt. This effectively breaks the dead zone of raw material accumulation under traditional single vibration or uniform speed transmission, increases the contact probability between the raw material and the screen holes, and reduces the leakage rate of fine materials. In addition, the setting of the first non-meshing section in the shaking screen system provides a short period of stillness for the screen box. Combined with the reciprocating movement of the screen belt, it allows the raw material that meets the aperture size to fall fully. The air blowing channel built into the upper pressure roller is linked with the air blowing pump at the fine material discharge nozzle. The air blowing holes blow out air in real time to clean the fine materials embedded in the screen holes. Combined with the squeezing and peeling action of the rubber convex plate on the press roller on the screen belt, it solves the problem of frequent shutdowns for cleaning blockages required by existing devices. The effective operating rate of the equipment is improved, and the cost of manual intervention is greatly reduced.
[0015] 2. This invention designs a linkage structure between the screening zone switching mechanism and the tensioning system. When it is necessary to switch screening zones with different apertures on the screen belt, the PLC controller controls the electric push rod to pull the second tensioning table to slide, causing the tensioning wheel to disengage from the third toothed belt, cutting off the power connection between the reciprocating rotation system and the roller. Subsequently, the conversion motor drives the incomplete gear to mesh with the driven gear on the roller, driving the roller to rotate precisely and move the target screening zone to the working position. The encoder built into the conversion motor can precisely control the rotation angle. After the switching is completed, the electric push rod pushes the tensioning wheel to reset, re-tensioning the third toothed belt to resume the screening operation. The switching process eliminates the need for manual disassembly of the screen, reducing time consumption. Furthermore, it can achieve automated switching for multiple batches of production through a PLC controller, meeting the differentiated requirements for raw material fineness for different products such as chewy and soft spicy strips. The equipment's versatility is improved compared to traditional fixed-aperture screening devices. Meanwhile, the tension springs in the two tensioning systems push the first tensioning platform to slide through elastic force, ensuring that the tensioning rollers remain in close contact with the screen belt. During the reciprocating movement of the screen belt or the switching of screening zones, the slack is automatically compensated, avoiding the problem of screening zone offset caused by screen belt slack, further ensuring the stability and accuracy of screening switching. Attached Figure Description
[0016] Figure 1A schematic diagram of the overall structure of an automatic screening device for raw materials used in spicy snack production; Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure; Figure 3 A schematic diagram of the structure of the roller and the rubber convex plate; Figure 4 This is a schematic diagram of the structure of the roller and the synchronous shaft; Figure 5 for Figure 4 A magnified schematic diagram of the partial structure at point A in the middle; Figure 6 This is a schematic diagram of the structure of the roller and the press roller; Figure 7 This is a magnified schematic diagram of the local structure at point B in convex 6; Figure 8 A schematic diagram of the structure of a driven gear and an incomplete gear; Figure 9 A schematic diagram of the synchronous shaft and synchronous gear; Figure 10 A schematic diagram of the positioning convex ring and the internal rack plate; Figure 11 This is a schematic diagram of the eccentric wheel and connecting rod.
[0017] The attached diagram lists the components represented by each number as follows: 1. Frame; 2. Screen box; 3. Roller; 4. Press roller; 5. Screen belt; 6. Rubber convex plate; 7. Reciprocating table; 8. Upper pressure roller; 9. Lower pressure roller; 10. Dual-head motor; 11. Drive wheel; 12. First meshing section; 13. First non-meshing section; 14. Rotary shaft; 15. Driven gear; 16. Eccentric wheel; 17. Connecting rod; 18. First tensioning table; 19. Tensioning spring; 20. Tensioning roller; 21. Servo motor; 22. Transmission wheel; 2 3. Second meshing section; 24. Second non-meshing section; 25. Internal rack plate; 26. Return spring; 27. External rack plate; 28. Synchronous shaft; 29. Synchronous gear; 30. Conversion motor; 31. Incomplete gear; 32. Driven gear; 33. Second tensioning table; 34. Electric actuator; 35. Tensioning wheel; 36. Fine material discharge nozzle; 37. Coarse material discharge nozzle; 38. PLC controller; 39. Air blow hole; 40. Positioning convex ring; 41. Air blow pump. Detailed Implementation
[0018] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.
[0019] The present invention provides the following preferred embodiments. like Figure 1-11As shown, the automatic screening device for raw materials used in spicy snack production includes a frame 1 and a sieve box 2. A PLC controller 38 is mounted on the mounting bracket 1; It also includes a shaking screen system, which is used to intermittently and repeatedly change the angle between the frame 1 and the screen box 2; The shaking screen system includes a double-headed motor 10 mounted on a base 1, a screen box 2 hinged to the base 1, and drive wheels 11 mounted on both output shafts of the double-headed motor 10. Each drive wheel 11 is alternately provided with two first meshing sections 12 and two first non-meshing sections 13. A rotating shaft 14 is rotatably mounted on the base 1. Driven gears 15 are mounted on the rotating shaft 14 at positions corresponding to the two drive wheels 11. The two first meshing sections 12 alternately mesh with the driven gears 15. Two eccentric wheels 16 are mounted on the rotating shaft 14. Connecting rods 17 are hinged to the eccentric positions of the two eccentric wheels 16. The other ends of the two connecting rods 17 are hinged to the screen box 2. The central angles corresponding to the two first meshing sections 12 are 120° and 80°, respectively, and the central angles corresponding to the two first non-meshing sections 13 are both 80°. In a preferred embodiment, the radius of the drive wheel 11 is 6 times the radius of the driven gear 15; When the dual-head motor 10 drives two drive wheels 11 with different center angles and first meshing sections 12 to rotate, it can drive the rotating shaft 14 and the eccentric wheel 16 to rotate intermittently through alternating meshing with the driven gear 15; The eccentric wheel 16 pulls the screen box 2 to swing back and forth around the hinge point with the base 1 via the connecting rod 17, realizing the intermittent reciprocating change of the angle between the base 1 and the screen box 2. This design, combined with the radius ratio of the drive wheel 11 and the driven gear 15, can both amplify the driving force through deceleration to ensure the stable swing of the screen box 2, and utilize the difference in the center angle of different meshing sections to make the swing amplitude and frequency of the screen box 2 change periodically, avoiding the accumulation of raw materials on the screen belt 5 and improving screening efficiency. Meanwhile, the first non-meshing section 13 is configured to provide a short settling time for the screen box 2, which allows the raw materials that meet the aperture size to fall fully and reduces screening omissions. Two rollers 3 and two pressing rollers 4 are rotatably mounted on the screen box 2. Each of the two rollers 3 is connected to a first toothed belt. The two first toothed belts are respectively connected to the two pressing rollers 4. The two rollers 3 are linked by a second toothed belt. A screen belt 5 is wound between the two rollers 3. Screen belt 5 is made of 304 stainless steel thin strip; Fine material discharge nozzles 36 and coarse material discharge nozzles 37 are installed on the screen box 2 and at the positions corresponding to the lower part of the screen belt 5, respectively. The screen belt 5 is provided with a set of screening zones. Each screening zone is provided with screen holes at equal intervals. The aperture of the screen holes in each screening zone is different. Each press roller 4 is equipped with a set of regularly distributed rubber protrusions 6 that are in contact with the screen belt 5. The rubber protrusions 6 are located on the outside of the screen belt 5 and are made of rubber. Specifically, this device is mainly suitable for screening chili powder during the production of spicy strips; The aperture of the screening holes in each screening zone can be customized according to the filtration requirements of chili powder; The two rollers 3 rotate synchronously through the linkage of the second toothed belt, ensuring the stable movement of the screen belt 5; When the roller 3 drives the pressing roller 4 to rotate through the first toothed belt, the rubber protrusion 6 on the pressing roller 4 can peel off the residual chili powder on the screen belt 5 by squeezing and deforming the screen belt 5, thereby reducing the residual rate of chili powder on the screen belt 5 after screening. The screen design with different apertures in different screening zones on the screen belt 5 can meet the different screening requirements of chili powder and satisfy the requirements of different textures of raw materials in the production of spicy strips. The 304 stainless steel thin strip screen belt 5 has wear-resistant and corrosion-resistant properties, meets the hygiene requirements of food production, and is easy to clean; The fine material discharge nozzle 36 and coarse material discharge nozzle 37 below can collect screening products of different fineness respectively, realizing the integration of screening and collection and improving production continuity. Two tensioning systems are used to keep the screen belt 5 taut; Both tensioning systems include a first tensioning platform 18 slidably connected to the screen box 2. A tensioning spring 19, which is limited by the screen box 2, is installed on the side of the first tensioning platform 18. A tensioning roller 20 is rotatably installed on the first tensioning platform 18. The roller surface of the tensioning roller 20 is in rolling connection with the screen belt 5. When the screen belt 5 becomes loose during operation, or when tension fluctuations occur during reciprocating movement and transmission, the tension spring 19 can push the first tensioning table 18 to slide through its elastic force, causing the tension roller 20 to press tightly against the surface of the screen belt 5, automatically compensating for the looseness of the screen belt 5, and ensuring that the screen belt 5 is always in a taut state. This elastic tensioning structure eliminates the need for frequent manual adjustments, which can avoid problems such as screening zone shift and raw material leakage caused by the loosening of the screen belt 5. It can also reduce the slippage between the screen belt 5 and the roller 3 and the pressing roller 4, ensuring the stability of the transmission and screening action of the screen belt 5 and extending the service life of the screen belt 5. The reciprocating table 7 is slidably installed on the screen box 2. The upper pressure roller 8 and the lower pressure roller 9 are rotatably installed on the reciprocating table 7. A guide seam that fits with the screen belt 5 is provided between the upper pressure roller 8 and the lower pressure roller 9. It also includes an air pump 41 installed on the fine material discharge nozzle 36, an air blowing channel is opened inside the upper pressure roller 8, and multiple sets of air blowing holes 39 are opened on the upper pressure roller 8. The air blowing holes 39 are connected to the air blowing channel. A set of regularly distributed positioning protrusions 40 that fit with the screen belt 5 are installed on both the upper pressure roller 8 and the lower pressure roller 9. The positioning protrusions 40 are made of rubber.
[0020] The guide gap between the upper pressure roller 8 and the lower pressure roller 9 can limit and guide the screen belt 5, ensuring that the screen belt 5 does not deviate or wrinkle during reciprocating movement, and ensuring the accurate relative position of the screening area and the discharge port. The air pump 41 on the fine material discharge nozzle 36 can blow air from the air blowing hole 39 to the surface of the screen belt 5 through the air blowing channel in the upper pressure roller 8, so as to clean the fine raw materials that are blocked in the screen holes in time and avoid the screen holes from being blocked and causing a decrease in screening efficiency. The rubber positioning protrusion 40 can further enhance the fit between the screen belt 5 and the pressure roller, prevent the screen belt 5 from slipping, and at the same time, the flexibility of rubber can avoid causing hard wear to the screen belt 5. This structure balances the positioning stability and cleanliness of the screen belt 5, improving the continuous working capability of the device. A reciprocating drive system is used to drive the reciprocating table 7 to move back and forth, and the reciprocating stroke and reciprocating frequency of the reciprocating table 7 change periodically. The reciprocating drive system includes a servo motor 21 mounted on the screen box 2. A transmission wheel 22 is mounted on the output shaft end of the servo motor 21. Three second meshing sections 23 and three second non-meshing sections 24 are alternately arranged on the transmission wheel 22. An internal rack plate 25 is mounted on the reciprocating table 7. The three second meshing sections 23 alternately mesh with the internal rack plate 25. A return spring 26 is mounted on the bottom surface of the reciprocating table 7. The other end of the return spring 26 is fixedly connected to the screen box 2.
[0021] The central angles of the three second meshing sections 23 along the clockwise direction are 50°, 60° and 70° respectively, and the central angles of the three second non-meshing sections 24 are all 60°. The first meshing section 12, the second meshing section 23 and the internal rack plate 25 are all provided with an anti-impact protective coating with a thickness of 0.15mm. When the servo motor 21 drives the transmission wheel 22 with three different center angle second meshing sections 23 to rotate, it can drive the reciprocating table 7 to slide along the screen box 2 through alternating meshing with the internal rack plate 25. The return spring 26 pulls the reciprocating table 7 to return to its original position during the non-engaging phase, thereby realizing the reciprocating movement of the reciprocating table 7. Because the center angles of the three second meshing sections 23 are different, combined with the uniform rotation of the transmission wheel 22, the reciprocating stroke and reciprocating frequency of the reciprocating table 7 will change periodically. This variable parameter reciprocating motion can make the raw material on the screen belt 5 continuously change its movement trajectory, avoid the accumulation of raw material in "dead corners" due to a single movement mode, significantly increase the contact probability between the raw material and the screen holes, and improve the screening efficiency. In addition, the 0.15mm thick anti-impact protective coating can reduce the collision wear of the tooth surface during meshing and extend the service life of the transmission components; The reciprocating rotation system is driven by the reciprocating table 7 and drives the screen belt 5 to reciprocate when the screen area switching mechanism is not working.
[0022] The reciprocating rotary system includes an outer rack plate 27 mounted on the reciprocating table 7, a synchronous shaft 28 rotatably mounted on the screen box 2, a synchronous gear 29 that meshes with the outer rack plate 27 mounted on the synchronous shaft 28, and a third toothed belt that drives the synchronous shaft 28 to a roller 3.
[0023] When the reciprocating table 7 moves back and forth, the outer rack plate 27 on its side will drive the synchronous gear 29 on the synchronous shaft 28 to rotate in both directions. The synchronous shaft 28 then drives the roller 3 to rotate back and forth through the third toothed belt, thus realizing the reciprocating movement of the screen belt 5. The system cleverly utilizes the power of the reciprocating table 7, eliminating the need for an additional drive source, simplifying the device structure and reducing energy consumption; When the screen switching mechanism is not working, the reciprocating movement of the screen belt 5 can work in synergy with the reciprocating shaking of the screen box 2, so that the raw material can both swing up and down and move back and forth on the screen belt 5, further enhancing the dispersion of the raw material and improving the screening accuracy. At the same time, reciprocating movement can reduce the continuous pressure of raw materials on a single screen hole, reducing the risk of screen blockage; The screening zone switching mechanism is used to change the relative position of each screening zone and the roller 3; The screen zone switching mechanism includes a conversion motor 30 mounted on the screen box 2. An incomplete gear 31 is mounted on the output shaft end of the conversion motor 30. The center angle corresponding to the effective meshing section on the incomplete gear 31 is 150°. A driven gear 32 that meshes with the incomplete gear 31 is mounted on a roller 3. A second tensioning platform 33 is slidably connected to the screen box 2. An electric push rod 34 is installed between the second tensioning platform 33 and the screen box 2. A tensioning wheel 35 is rotatably mounted on the second tensioning platform 33. The tensioning wheel 35 is connected to a third toothed belt drive.
[0024] The conversion motor 30 has a built-in encoder, which precisely limits whether the incomplete gear 31 and the driven gear 32 mesh, as well as the number of rotations and rotation angle of the conversion motor 30 when driving the screen belt 5, thereby precisely controlling the position of each screening zone relative to the roller 3. When it is necessary to switch the screening zone on the screen belt 5, the electric push rod 34 pulls the second tensioning table 33 to slide, so that the tensioning wheel 35 disengages from the third toothed belt, cutting off the power connection between the reciprocating rotation system and the roller 3. Subsequently, the conversion motor 30 drives the incomplete gear 31 to rotate, which meshes with the passive gear 32 on the roller 3, thereby driving the roller 3 to rotate and moving the target screening area to the working position. The 150° effective meshing section of the incomplete gear 31, in conjunction with the encoder built into the conversion motor 30, can precisely control the rotation angle of the roller 3, ensuring the accuracy of the screening zone switching. After the screening area is switched, the electric actuator 34 pushes the tensioning wheel 35 to reset, re-tensions the third toothed belt, and restores the driving function of the reciprocating rotation system; The conversion process is highly automated, with precise and rapid switching, requiring no manual intervention. It can meet the screening needs of different batches of raw materials in spicy strip production, improving the versatility of the equipment and production flexibility.
[0025] The above description is only a preferred embodiment of the present invention and is 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. An automatic screening device for raw materials used in spicy snack production, comprising a frame (1) and a sieve box (2), characterized in that: It also includes a shaking screen system for intermittently and repeatedly changing the angle between the frame (1) and the screen box (2); Two rollers (3) and two pressing rollers (4) are rotatably mounted on the screen box (2). The two rollers (3) are connected to a first toothed belt. The two first toothed belts are respectively connected to the two pressing rollers (4). The two rollers (3) are linked by a second toothed belt. A screen belt (5) is wound between the two rollers (3). A set of screening areas is provided on the screen belt (5). Each screening area is provided with screen holes at equal intervals. The aperture of the screen holes in each screening area is different. Each pressing roller (4) is equipped with a set of regularly distributed rubber convex plates (6) that fit against the screen belt (5). Two tensioning systems are used to keep the screen belt (5) taut; The reciprocating table (7) is slidably installed on the screen box (2). The upper pressure roller (8) and the lower pressure roller (9) are rotatably installed on the reciprocating table (7). A guide seam that fits with the screen belt (5) is provided between the upper pressure roller (8) and the lower pressure roller (9). A reciprocating drive system is used to drive the reciprocating table (7) to move back and forth, and the reciprocating stroke and reciprocating frequency of the reciprocating table (7) change periodically. The screening zone switching mechanism is used to change the relative position of each screening zone and the roller (3); The reciprocating rotation system is driven by the reciprocating table (7) and drives the screen belt (5) to move back and forth when the screen area switching mechanism is not working.
2. The automatic screening device for raw materials in spicy strip production according to claim 1, characterized in that: The shaking screen system includes a double-headed motor (10) mounted on a frame (1). The screen box (2) is hinged to the frame (1). Both output shafts of the double-headed motor (10) are equipped with drive wheels (11). Each drive wheel (11) has two alternating first meshing sections (12) and first non-meshing sections (13). A rotating shaft (14) is rotatably mounted on the frame (1). A driven gear (15) is mounted on the rotating shaft (14) at a position corresponding to the two drive wheels (11). The two first meshing sections (12) alternately mesh with the driven gear (15). Two eccentric wheels (16) are mounted on the rotating shaft (14). A connecting rod (17) is hinged to the eccentric position of each of the two eccentric wheels (16). The other end of each of the two connecting rods (17) is hinged to the screen box (2).
3. The automatic screening device for raw materials in spicy strip production according to claim 2, characterized in that: The central angles corresponding to the two first meshing sections (12) are 120° and 80° respectively, and the central angles corresponding to the two first non-meshing sections (13) are both 80°. The radius of the drive wheel (11) is 5 to 7 times the radius of the driven gear (15).
4. The automatic screening device for raw materials for spicy strip production according to claim 1, characterized in that: Both tensioning systems include a first tensioning platform (18) slidably connected to the screen box (2), a tensioning spring (19) limited by the screen box (2) is installed on the side of the first tensioning platform (18), and a tensioning roller (20) is rotatably installed on the first tensioning platform (18), the roller surface of the tensioning roller (20) is tumbledly connected to the screen belt (5).
5. The automatic screening device for raw materials in spicy strip production according to claim 3, characterized in that: The reciprocating drive system includes a servo motor (21) mounted on the screen box (2). A transmission wheel (22) is mounted on the output shaft end of the servo motor (21). Three second meshing sections (23) and three second non-meshing sections (24) are alternately arranged on the transmission wheel (22). An internal rack plate (25) is mounted on the reciprocating table (7). The three second meshing sections (23) alternately mesh with the internal rack plate (25). A return spring (26) is mounted on the bottom surface of the reciprocating table (7). The other end of the return spring (26) is fixedly connected to the screen box (2).
6. The automatic screening device for raw materials in spicy strip production according to claim 3, characterized in that: The central angles of the three second meshing sections (23) in the clockwise direction are 50°, 60° and 70° respectively, and the central angles of the three second non-meshing sections (24) are all 60°. The first meshing section (12), the second meshing section (23) and the internal rack plate (25) are all provided with an anti-impact protective coating, and the thickness of the anti-impact protective coating is 0.15mm.
7. The automatic screening device for raw materials in spicy strip production according to claim 1, characterized in that: The reciprocating rotation system includes an external rack plate (27) mounted on a reciprocating table (7), a synchronous shaft (28) rotatably mounted on the screen box (2), a synchronous gear (29) meshing with the external rack plate (27) mounted on the synchronous shaft (28), and a third toothed belt drivingly connecting the synchronous shaft (28) and one of the rollers (3).
8. The automatic screening device for raw materials in spicy strip production according to claim 6, characterized in that: The screen area switching mechanism includes a conversion motor (30) installed on the screen box (2). An incomplete gear (31) is installed on the output shaft end of the conversion motor (30). The center angle corresponding to the effective meshing section on the incomplete gear (31) is 150°. A driven gear (32) meshing with the incomplete gear (31) is installed on one of the rollers (3). A second tensioning platform (33) is slidably connected on the screen box (2). An electric push rod (34) is installed between the second tensioning platform (33) and the screen box (2). A tensioning wheel (35) is rotatably installed on the second tensioning platform (33). The tensioning wheel (35) is connected to a third toothed belt drive.
9. The automatic screening device for raw materials in spicy strip production according to claim 1, characterized in that: Fine material discharge nozzle (36) and coarse material discharge nozzle (37) are respectively installed on the screen box (2) and below the screen belt (5). The screen belt (5) is a thin strip of 304 stainless steel. A PLC controller (38) is installed on the frame (1).
10. The automatic screening device for raw materials in spicy strip production according to claim 9, characterized in that: It also includes an air pump (41) installed on the fine material discharge nozzle (36). An air blowing channel is provided inside the upper pressure roller (8). Multiple sets of air blowing holes (39) are provided on the upper pressure roller (8). The air blowing holes (39) are connected to the air blowing channel. A set of regularly distributed positioning protrusions (40) that fit with the screen belt (5) are installed on both the upper pressure roller (8) and the lower pressure roller (9). The positioning protrusions (40) are made of rubber.