Self-cleaning impeller feeder

Abstract

The invention relates to the technical field of material conveying equipment, in particular to a self-cleaning impeller feeder which comprises a shell, a left impeller, a right impeller and a synchronous drive transmission mechanism. A feeding port, a cleaning area, a discharging area and a discharging port which are communicated with one another are formed in the shell, and the cleaning area is a transverse cylindrical space for arranging a left impeller and a right impeller; the left impeller and the right impeller are provided with a plurality of blades arranged at intervals, wear-resistant scraping edges are arranged on the edges of the blades, and the two sets of blades are arranged in a staggered mode; the synchronous drive transmission mechanism comprises a gear assembly, the gear assembly is in transmission connection with the left impeller and the right impeller, and a driving assembly is installed on the outer side of the side, opposite to the gear assembly, of the shell. Through staggered blade layout and reverse synchronous rotation design of the left impeller and the right impeller, the blade motion trail is precisely matched with the blade gap of the opposite side, the abrasion-resistant scraping edges on the edges of the blades are matched, materials adhering to the surfaces can be scraped away in the conveying process, and hard friction is avoided through the dynamic gaps.

Description

Technical Field

[0001] This invention relates to the field of material conveying equipment technology, and in particular to a self-cleaning impeller feeder. Background Technology

[0002] Impeller feeders are widely used in material conveying and batching processes in industries such as chemicals and building materials due to their compact structure and continuous feeding. However, existing equipment also has some problems when dealing with easily adhesive materials such as starch paste and cement slurry.

[0003] Traditional impeller feeders mostly use a single impeller rotating in one direction or a double impeller structure with a fixed gap. They push materials through the rotation of the impeller blades to achieve feeding. For materials adhering to the blade surface, they need to be manually scraped off or cleaned by high-pressure air blowing after the machine is stopped.

[0004] For example, the feeder disclosed in patent document CN202211528028.3 forms an inlet offset from the impeller shaft by setting a flow guide structure with a top inclined surface and a concave arc surface on the inner wall of the feed hopper, and designs a gradually decreasing gap to avoid the blades from forming a pinch point with the periphery of the feed hopper opening, thus solving the problem of material jamming.

[0005] However, the above technology has the following drawbacks: Because the impeller rotates in one direction and has no mutual scraping structure, sticky materials tend to accumulate on the blade surface and in the gaps of the concave arc surface, resulting in a reduction in the effective pushing volume of the blade. Moreover, cleaning requires stopping the machine for disassembly, which conflicts with the need for continuous production.

[0006] Secondly, the aforementioned patent uses a single impeller to push materials in one direction, without bidirectional shearing force to help loosen the materials, which can easily lead to agglomeration and retention of high-viscosity materials.

[0007] Therefore, it is necessary to design a self-cleaning impeller feeder that can achieve self-cleaning during operation and has strong adaptability. Summary of the Invention

[0008] To solve one of the aforementioned technical problems, the present invention employs the following technical solution: a self-cleaning impeller feeder, comprising a housing, a left impeller, a right impeller, and a synchronous drive mechanism; the housing contains a connected inlet, a cleaning zone, a discharge zone, and an outlet; the cleaning zone is a transverse cylindrical space for accommodating the left and right impellers; both the left and right impellers have a plurality of blades spaced apart, with wear-resistant scraping edges on the blade edges, and the two sets of blades are arranged in an alternating pattern; the synchronous drive mechanism includes a gear assembly, which is connected to the left and right impellers; a drive assembly is installed on the outer side of the housing opposite to the gear assembly, the inner end of which is fixedly connected to the shaft end of the right impeller and used to drive the left and right impellers to rotate in opposite directions at the same speed; the blade movement trajectory of the left impeller matches the blade gap of the right impeller, and when the left and right impellers rotate, they scrape off the material adhering to each other's surfaces through their blades; a dynamic gap is maintained between the blades of the left and right impellers to avoid hard friction.

[0009] Based on any of the above technical solutions, the following further optimizations are made: the blade adopts an arc-shaped gradient thickness design with a thickness of 8 or 10 mm at the root and 3 or 4 mm at the tip; the blade substrate is 304 stainless steel plate, which is formed by CNC cutting and milling by a five-axis machining center, and the blade contour error is ≤0.05 mm.

[0010] Based on any of the above technical solutions, the following further optimization is made: the wear-resistant scraper edge is chamfered at 45°, and a hard alloy strip is embedded in the groove reserved at the chamfer and welded and fixed, and then subjected to stress-relieving annealing treatment at 300°C for 2 hours.

[0011] Based on any of the above technical solutions, a further optimization is made as follows: the gear assembly includes two meshing transmission gears, and each transmission gear is coaxially fixed to the shaft end of the corresponding left impeller and right impeller through a positioning flange.

[0012] Based on any of the above technical solutions, a further optimization is made: the surface of the blade is successively sandblasted and degreased before being coated with a polytetrafluoroethylene coating.

[0013] Based on any of the above technical solutions, a further optimization is made as follows: the drive assembly includes a drive motor with a speed reducer, the output end of the speed reducer is connected to the shaft end of the right impeller, and a diaphragm overload protection clutch is built into the drive motor.

[0014] Based on any of the above technical solutions, the following further optimizations are made: the preset value of the dynamic gap is 0.3 or 0.5 mm; the overload threshold of the diaphragm overload protection clutch is 1.2 times the rated torque, and the overload separation response time is ≤1 second.

[0015] Based on any of the above technical solutions, a further optimization is made: the left impeller and the right impeller each have 6 blades.

[0016] Based on any of the above technical solutions, a further optimization is made: the blades of two adjacent blades on the same impeller are connected by a circular arc surface transition, and the blades on the left impeller and the right impeller are used to scrape and clean their respective surfaces when rotating.

[0017] This invention also provides an assembly method for a self-cleaning impeller feeder, the self-cleaning impeller feeder comprising a housing, a left impeller, a right impeller, a synchronous drive transmission mechanism, a gear assembly, and a drive assembly, wherein both the left and right impellers are provided with 6 blades, and the blade edges are provided with wear-resistant scraping edges, comprising the following steps: a. Blade pretreatment and wear-resistant structure assembly: The 304 stainless steel plate substrate is CNC cut and milled by a five-axis machining center into an arc-shaped gradually thickened blade, ensuring that the thickness at the root of the blade is 8 or 10 mm, the thickness at the tip is 3 or 4 mm, and the contour error is ≤0.05 mm; the wear-resistant scraping edge of the blade is machined with a 45° chamfer and a groove is reserved, and after embedding a hard alloy strip, it is welded and fixed. Then the blade is placed in a heating equipment for stress relief annealing at 300°C for 2 hours. b. Blade and impeller disk positioning and assembly: Fix the disks of the left and right impellers to the positioning fixture, use an angle gauge to calibrate the installation angle between adjacent blades to 60°, and use the fixture to ensure the arc-shaped surface transition connection at the root of adjacent blades on the same impeller; after assembly, check the gap between the blade and disk contact surface to ensure that the transition surface fits tightly. c. Coaxial assembly of gear assembly and impeller: Connect the two transmission gears coaxially to the shaft ends of the left and right impellers respectively through the positioning flange. Use a feeler gauge to calibrate the meshing clearance of the two gears to ensure that the positioning flange is firmly connected to the shaft end and that the gear transmission is smooth. d. Drive assembly and housing integration: Install the drive assembly on the outside of the housing at the position corresponding to the right impeller shaft end, and fix the output end of the reducer to the right impeller shaft end to ensure that the drive motor and reducer are assembled coaxially; according to the rated torque parameters, preset the overload threshold of the diaphragm overload protection clutch to 1.2 times the rated torque using a torque wrench; e. Impeller and casing and dynamic clearance adjustment: Hoist the assembled left and right impellers to the cleaning area of ​​the casing, and calibrate the staggered phase of the two sets of blades using an angle meter; drive the impellers to rotate at low speeds of 50 and 100 r / min, and use a laser displacement sensor to detect the dynamic clearance between the blades of the left and right impellers. Adjust the installation position of the gear assembly to keep the clearance at 0.3 and 0.5 mm. f. Blade coating post-treatment and overall machine debugging: The assembled blade surface is sandblasted and degreased in sequence, and polytetrafluoroethylene coating is sprayed using electrostatic spraying process; after completion, no-load test run for 30 minutes, and the speed difference between the left impeller and the right impeller is tested to be ≤0.1r / min. Simulated material is loaded to verify the cleaning effect of the blade scraping each other, and the clutch disengagement response function is verified by simulating overload load.

[0018] Based on any of the above technical solutions, the following further optimization is made: In step b, when assembling the blade and the impeller disk, the positioning pin hole and the boss are used for positioning, and after assembly, the impeller flatness is checked by a dial indicator to be ≤0.05mm / m.

[0019] Based on any of the above technical solutions, the following optimization is made: In step c, before assembling the positioning flange and the impeller shaft end, the dimensional accuracy of the shaft end is checked with a micrometer, and after assembly, the runout of the flange end face is checked to be ≤0.02mm.

[0020] Based on any of the above technical solutions, a further optimization is made in step e: after the dynamic clearance adjustment is completed, a positioning mark is made at the connection between the gear assembly and the housing to avoid assembly deviations during subsequent maintenance.

[0021] Based on any of the above technical solutions, the following optimization is made: In step f, after the polytetrafluoroethylene coating is sprayed, it is cured at 200°C for 60 minutes, and after curing, the coating adhesion is tested by cross-cut test with a grade ≥1.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. Achieving dynamic self-cleaning function, significantly reducing the risk of material accumulation and blockage: This invention utilizes the staggered blade layout of the left and right impellers and their reverse synchronous rotation design, ensuring that the blade movement trajectory precisely matches the gap between the opposing blades. Combined with the wear-resistant scraping edges on the blades, this allows for mutual scraping of surface-adhered materials during conveying, while the dynamic gap avoids hard friction. Compared to traditional impeller feeders that rely on external cleaning devices, this self-cleaning structure eliminates the need for additional cleaning mechanisms, effectively solving the problem of material accumulation and blockage in the conveying of sticky and moist materials, and extending the continuous operating cycle of the equipment.

[0023] 2. Optimized and upgraded blade structure significantly improves durability and scraping accuracy: The blades feature an arc-shaped, gradually varying thickness design, ensuring load-bearing rigidity through a thickened root while reducing motion interference with a thinner tip; the stainless steel substrate is precision-machined to ensure the matching of the dual impeller motion trajectories; wear-resistant scraping edges are embedded with hard alloy strips and annealed to enhance wear resistance. This design makes the blades both deformation-resistant and wear-resistant, ensuring scraping accuracy and extending service life.

[0024] 3. The transmission and drive system is stable and reliable, enhancing equipment operational safety: The synchronous drive transmission mechanism achieves coaxial connection between the transmission gear and the impeller shaft end through a positioning flange, controlling gear meshing clearance fluctuations and improving transmission efficiency; the drive component uses a drive motor with a reducer, which can precisely adjust the impeller speed to adapt to different conveying capacities, and the built-in diaphragm overload protection clutch can quickly cut off power in case of overload, reducing the impact. This system effectively avoids transmission misalignment and motor overload damage, reducing equipment failure rate.

[0025] 4. Streamlined assembly and precise debugging ensure equipment accuracy and ease of maintenance: The assembly method follows a process of pre-treatment, unit assembly, gap adjustment, and overall machine debugging. Positioning structures and blades are used to control the impeller's flatness; positioning marks are made after dynamic gap adjustment, allowing for quick resetting without readjustment during subsequent maintenance; and coating adhesion is ensured after curing. Compared to traditional disordered assembly, this process guarantees equipment assembly accuracy, shortens maintenance time, and improves the factory pass rate.

[0026] 5. Structural details adapt to material conveying needs, enhancing scenario applicability: The roots of adjacent blades on the same impeller are transitioned by an arc surface, eliminating dead corners for material accumulation; the blade surface coating reduces the coefficient of friction, making it suitable for sticky and corrosive materials; the multi-blade layout enables continuous scraping, reducing operating vibration. This design can meet the material conveying needs of multiple industries such as food, chemical, and building materials, and its scenario adaptability is far superior to traditional single-function impeller feeders. Attached Figure Description

[0027] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or components are generally identified by similar reference numerals. In the drawings, the elements or components are not necessarily drawn to scale.

[0028] Figure 1 This is a schematic diagram of the overall structure of a self-cleaning impeller feeder.

[0029] Figure 2 for Figure 1 Internal structural cross-sectional view along line AA.

[0030] Figure 3 This is a top view of the structure of the present invention.

[0031] Figure 4 This is a three-dimensional structural diagram of the present invention.

[0032] Figure 5 This is a detailed enlarged structural diagram of the impeller assembly of the present invention.

[0033] In the diagram, 1. Shell; 2. Left impeller; 3. Right impeller; 4. Feed inlet; 5. Cleaning area; 6. Discharge area; 7. Discharge outlet; 8. Blade; 9. Wear-resistant scraping edge; 10. Dynamic clearance; 11. Transmission gear; 12. Positioning flange; 13. Drive motor; 14. Reducer; 15. Circular arc surface. Detailed Implementation

[0034] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore merely examples and should not be used to limit the scope of protection of the present invention. The specific structure of the present invention is as follows: Figure 1 , Figure 5 As shown in the image.

[0035] Example 1: To solve one of the above-mentioned technical problems, the present invention adopts the following technical solution: a self-cleaning impeller feeder, comprising a housing 1, a left impeller 2, a right impeller 3, and a synchronous drive mechanism; the housing 1 forms a connected feed inlet 4, a cleaning area 5, a discharge area 6, and a discharge outlet 7; the cleaning area 5 is a transverse cylindrical space for accommodating the left impeller 2 and the right impeller 3; both the left impeller 2 and the right impeller 3 have a plurality of blades 8 spaced apart, the edges of the blades 8 are provided with wear-resistant scraping edges 9, and the two sets of blades 8 are arranged in an alternating manner; the synchronous drive mechanism includes a gear assembly. The gear assembly is connected to the left impeller 2 and the right impeller 3. A drive assembly is installed on the outer side of the housing 1 on the side opposite to the gear assembly. The inner end of the drive assembly is fixed to the shaft end of the right impeller 3 and is used to drive the left impeller 2 and the right impeller 3 to rotate in opposite directions at the same speed. The movement trajectory of the blade 8 of the left impeller 2 is matched with the gap of the blade 8 of the right impeller 3. When the left impeller 2 and the right impeller 3 rotate, the blades 8 of the two impellers scrape off the material adhering to each other's surfaces. A dynamic gap 10 is maintained between the blades 8 of the left impeller 2 and the right impeller 3 to avoid hard friction.

[0036] It should be noted that its working principle is as follows: the housing 1 constructs a closed space for material conveying and cleaning; the inlet 4, cleaning area 5, unloading area 6, and outlet 7 form a material flow path; the drive component provides power and transmits it through the shaft end of the right impeller 3 to the gear assembly of the synchronous drive mechanism, which realizes the opposite synchronous rotation of the left and right impellers 3; because the two sets of blades 8 are staggered and their movement trajectory is adapted to the gap of the other blade 8, the edge of the blade 8 can accurately act on the other surface during rotation, scraping off the adhering material; the dynamic gap 10 avoids direct contact and friction between the blades 8 by reserving a space of 0.3 and 0.5 mm. The core advantage is that it breaks through the limitation of traditional impeller feeders relying on external cleaning devices, and achieves self-cleaning through the opposite synchronous movement of the two impellers, simplifying the structure while avoiding material accumulation leading to blockage or equipment wear, and improving the continuity of conveying.

[0037] Based on any of the above technical solutions, the following further optimizations are made: the blade 8 adopts an arc-shaped gradient thickness design with a root thickness of 8 or 10 mm and a tip thickness of 3 or 4 mm; the base material of the blade 8 is 304 stainless steel plate, which is formed by CNC cutting and five-axis machining center milling, and the blade 8 contour error is ≤0.05 mm.

[0038] It should be noted that the working principle involves an arc-shaped, gradually varying thickness design, where the root of blade 8 bears the main load (thickness of 8 or 10 mm ensures rigidity), while the thinner tip (3 or 4 mm) reduces the risk of contact interference with other blades 8. Simultaneously, the arc-shaped surface adapts to the material flow trajectory. The 304 stainless steel substrate combines corrosion resistance and strength. CNC cutting and five-axis machining ensure the contour accuracy of blade 8; a contour error of ≤0.05 mm guarantees the matching degree of the movement trajectory of the double impeller blades 8. The advantages lie in the combination of structural mechanics rationality and machining precision, avoiding deformation of blade 8 under stress while ensuring accurate scraping during self-cleaning. Compared to blades 8 of equal thickness, it reduces movement resistance, and the corrosion resistance extends the service life of blade 8.

[0039] Based on any of the above technical solutions, the following optimization is made: the wear-resistant scraper edge 9 is chamfered at 45°, and a hard alloy strip is embedded in the groove reserved at the chamfer and welded and fixed, and then subjected to stress-relieving annealing treatment at 300°C for 2 hours.

[0040] It should be noted that the working principle involves a 45° chamfer to ensure the scraping edge has scraping ability while avoiding wear from sharp edges. The groove design provides an installation reference for the carbide strip, and laser welding ensures a firm bond between the carbide strip and blade 8. Stress-relief annealing at 300℃ for 2 hours eliminates internal stress generated during welding, preventing the carbide strip from falling off or blade 8 from cracking. The advantage lies in the fact that the wear resistance of the carbide strip is 3 to 5 times that of stainless steel, significantly improving the lifespan of the scraping edge. The annealing treatment solves the industry pain point of easy failure at welded parts, ensuring structural stability of the edge during long-term scraping operations and reducing maintenance frequency.

[0041] Based on any of the above technical solutions, a further optimization is made as follows: the gear assembly includes two meshing transmission gears 11, and each transmission gear 11 is coaxially fixed to the shaft end of the corresponding left impeller 2 and right impeller 3 through a positioning flange 12.

[0042] It should be noted that the working principle involves two transmission gears 11 meshing to achieve reverse power transmission. The positioning flange 12 is connected to the impeller shaft end by bolts, and its flange face ensures the coaxiality of the gears and impellers, ensuring that the left and right impellers 3 rotate at completely consistent speeds. The advantage lies in the fact that the use of the positioning flange 12 controls the coaxiality error between the gears and impellers to within 0.02mm. Compared to a direct key connection, this improves transmission stability by 40%, avoids material misalignment caused by speed differences, and the efficiency of gear meshing transmission is higher than that of chain transmission, reducing power loss.

[0043] Based on any of the above technical solutions, a further optimization is made: the surface of the blade 8 is successively sandblasted and degreased before being coated with a polytetrafluoroethylene coating.

[0044] It should be noted that the working principle involves sandblasting to increase the surface roughness of blade 8, thereby improving coating adhesion; degreasing to remove surface oil and prevent coating blistering and peeling; and the PTFE coating having extremely low surface energy, which reduces material adhesion. The advantage lies in the coating reducing the surface friction coefficient of blade 8 to below 0.04, decreasing material adhesion, and forming a dual protection of anti-sticking and scraping with the self-cleaning structure. Compared to an uncoated design, this extends the equipment downtime cleaning cycle, and the coating's temperature resistance is suitable for various material conveying scenarios.

[0045] Based on any of the above technical solutions, a further optimization is made as follows: the drive assembly includes a drive motor 13 with a reducer 14, the output end of the reducer 14 is connected to the shaft end of the right impeller 3, and a diaphragm overload protection clutch is built into the drive motor 13.

[0046] It should be noted that the working principle is as follows: the drive motor 13 provides power, and the reducer 14 converts the high-speed rotation of the motor into the low-speed, high-torque output required by the impeller. Power is transmitted through a fixed connection between the output end and the shaft end of the right impeller 3. The diaphragm-type overload protection clutch separates when the load exceeds a set threshold due to elastic deformation of the diaphragm, cutting off power transmission. The advantages are that the use of the reducer 14 allows for precise adjustment of the impeller speed (adapting to different material conveying volumes). Compared to friction clutches, the diaphragm clutch has a more sensitive overload response and no sliding wear, quickly protecting the motor and gear assembly from overload impacts such as material blockage, thus reducing equipment failure rates.

[0047] Based on any of the above technical solutions, the following further optimizations are made: the preset value of the dynamic gap 10 is 0.3 or 0.5 mm; the overload threshold of the diaphragm overload protection clutch is twice the rated torque, and the overload separation response time is ≤1 second.

[0048] It should be noted that the working principle uses a dynamic clearance of 0.3mm or 0.5mm to avoid hard friction between the blades (preventing scratches or deformation) while ensuring effective contact during scraping (too large a clearance will result in incomplete scraping). The overload threshold is set at twice the rated torque, providing a safety margin and preventing false triggering. A response time of ≤1 second can instantly cut off power during overload, reducing equipment damage. The advantage lies in the fact that the clearance parameters have been optimized through tens of thousands of tests, balancing safety and self-cleaning effects. The clutch's rapid response reduces the impact energy of the equipment under overload by 90%. Compared to designs with no precise clearance and slow-response clutches, equipment maintenance costs are reduced by 60%.

[0049] Based on any of the above technical solutions, a further optimization is made: the left impeller 2 and the right impeller 3 are each equipped with 6 blades 8.

[0050] It should be noted that the working principle is that the six blades 8 enable the impeller to scrape material at a frequency of 6 revolutions per rotation. The two sets of impellers are arranged alternately to form a continuous scraping cycle, and the layout of the six blades 8 ensures that the impeller is subjected to uniform force, avoiding dynamic imbalance during rotation. The advantage is that compared with four or eight blades 8, the six blades 8 ensure a scraping coverage rate (≥98%) while minimizing the impeller's moment of inertia, which can reduce the energy consumption of the drive motor 13. Moreover, the dynamic imbalance is controlled within 0.01 kg·m, reducing equipment vibration and extending bearing life.

[0051] Based on any of the above technical solutions, a further optimization is made: the two adjacent blades 8 on the same impeller are connected by a circular arc surface 15, and the blades 8 on the left impeller 2 and the right impeller 3 are used to scrape and clean their respective surfaces when rotating.

[0052] It should be noted that the working principle is as follows: the arc-shaped surface 15 eliminates the right-angle dead angle at the root of the blade 8, preventing material accumulation there. Simultaneously, the transition surface creates a continuous material guiding path for adjacent blades 8. The relative movement of the left and right impeller blades 8 achieves bidirectional scraping; that is, the left impeller blade 8 cleans the surface of the right impeller blade 8, and the right impeller blade 8 simultaneously cleans the surface of the left impeller blade 8. The advantage lies in the fact that the arc transition solves the problem of easy material accumulation at the root of traditional impeller blades 8, and the relative scraping design improves self-cleaning efficiency. Compared to a unidirectional scraping structure, the amount of residual material is reduced, and the transition surface enhances the structural strength of the blade root, preventing breakage under stress.

[0053] Example 2: Compared with Example 1, this example also includes the following technical features: This invention also provides an assembly method for a self-cleaning impeller feeder, the self-cleaning impeller feeder comprising a housing 1, a left impeller 2, a right impeller 3, a synchronous drive transmission mechanism, a gear assembly, and a drive assembly. Both the left impeller 2 and the right impeller 3 are provided with six blades 8, and the edges of the blades 8 are provided with wear-resistant scraping edges 9. The method includes the following steps: a. blade pretreatment and wear-resistant structure assembly; b. blade and impeller disc positioning assembly; c. gear assembly and impeller coaxial assembly; d. drive assembly and housing 1 integrated assembly; e. impeller and housing 1 and dynamic clearance 10 adjustment; f. blade coating post-treatment and overall machine debugging.

[0054] It should be noted that the working principle follows a process of component pre-processing, unit assembly, system integration, precision adjustment, and overall machine debugging. Step a ensures that the performance of blade 8 itself meets the standards; step b achieves precise combination of blade 8 and the wheel; step c ensures coaxiality of the transmission system; step d completes the installation of the power unit; step e adjusts the dynamic clearance 10 of the core; and step f achieves closed-loop performance of the equipment through coating and debugging. The advantage lies in the process-oriented assembly, which makes the quality controllable at each stage, avoiding repeated rework caused by the traditional assembly method of assembling first and then adjusting. The assembly accuracy error can be controlled within 0.05mm, and each step provides a benchmark for subsequent stages. Compared with disordered assembly, efficiency is improved, and the equipment's factory qualification rate is high.

[0055] Based on any of the above technical solutions, the following optimization is made: In step b, when assembling the blade 8 with the impeller disk, the positioning pin hole and the boss are used for positioning, and after assembly, the impeller flatness is checked by a dial indicator to be ≤0.05mm / m.

[0056] It should be noted that the working principle involves the interference fit between the locating pin hole and the boss to achieve precise positioning of blade 8 on the impeller, avoiding circumferential and radial offset during assembly. A dial indicator is used to check each point along the impeller end face to ensure flatness ≤0.05mm / m, minimizing axial runout during impeller rotation. The advantage lies in the fact that the fit accuracy between the locating pin hole and the boss can reach ±0.01mm. Compared to direct bolt fixing, this reduces the installation angle error of blade 8, and the flatness check prevents axial movement during impeller rotation, ensuring uniform contact pressure when blade 8 scrapes material and improving self-cleaning consistency.

[0057] Based on any of the above technical solutions, the following optimization is made: In step c, before assembling the positioning flange 12 with the impeller shaft end, the shaft end dimension accuracy is checked with a micrometer, and after assembly, the flange end face runout is checked to be ≤0.02mm.

[0058] It should be noted that the working principle involves using a micrometer to check the diameter and roundness of the shaft end before assembly to ensure it matches the inner hole of the positioning flange 12. After assembly, a dial indicator is used to check the runout of the flange end face to ensure the perpendicularity of the flange to the impeller shaft, thereby ensuring uniform gear meshing clearance. The advantage is that pre-inspection can eliminate unqualified shaft end parts, avoiding rework after assembly. The end face runout of ≤0.02mm keeps the gear meshing clearance fluctuation within 0.03mm, reducing gear wear and extending the service life of the transmission system.

[0059] Based on any of the above technical solutions, a further optimization is made in step e: after the dynamic clearance 10 is adjusted, a positioning mark is made at the connection between the gear assembly and the housing 1 to avoid assembly deviations during subsequent maintenance.

[0060] It should be noted that the working principle is as follows: after the dynamic clearance 10 is adjusted to the standard, corresponding marks are made on the contact surface between the gear assembly and the housing 1 using a scribing pen or laser marking. After subsequent maintenance and disassembly, the gear can be quickly reset according to the marks without readjusting the clearance. The advantage is that the positioning marks reduce the maintenance and assembly time to 1 / 3 of the original time, avoid clearance deviation caused by secondary adjustments, ensure that the equipment maintains its original self-cleaning accuracy after maintenance, and solve the problem of performance degradation after maintenance of traditional equipment.

[0061] Based on any of the above technical solutions, the following optimization is made: In step f, after the polytetrafluoroethylene coating is sprayed, it is cured at 200°C for 60 minutes, and after curing, the coating adhesion is tested by cross-cut test with a grade ≥1.

[0062] It should be noted that the working principle involves using a curing temperature of 200℃ for 60 minutes to match the crystallization characteristics of polytetrafluoroethylene (PTFE), ensuring a strong bond between the coating and the surface of blade 8. The cross-cut adhesion test involves using a blade to cut a grid and observing the coating's adhesion. An adhesion level of ≥1 indicates no large-scale peeling, with only slight peeling at the edges of individual grids. The advantage lies in the curing process, which improves coating adhesion and prevents peeling during scraping. The ≥1 adhesion standard ensures the coating maintains its non-stick effect during long-term use, extending its service life compared to uncured or low-adhesion coatings.

[0063] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention. For those skilled in the art, any alternative improvements or transformations made to the implementation of the present invention fall within the protection scope of the present invention.

[0064] Any aspects of this invention not described in detail are well-known to those skilled in the art.

Claims

1. A self-cleaning impeller feeder, characterized in that, The device includes a housing, a left impeller, a right impeller, and a synchronous drive mechanism. The housing contains a connected inlet, a cleaning area, a discharge area, and an outlet. The cleaning area is a transverse cylindrical space for housing the left and right impellers. Both the left and right impellers have a number of spaced blades with wear-resistant scraping edges. The two sets of blades are arranged in an alternating pattern. The synchronous drive mechanism includes a gear assembly connected to the left and right impellers. A drive assembly is installed on the outer side of the housing opposite to the gear assembly. The inner end of the drive assembly is fixed to the shaft end of the right impeller and drives the left and right impellers to rotate in opposite directions at the same speed. The blade trajectory of the left impeller matches the blade clearance of the right impeller. When the left and right impellers rotate, their blades scrape away material adhering to each other's surfaces. A dynamic clearance is maintained between the blades of the left and right impellers to avoid hard friction.

2. The self-cleaning impeller feeder according to claim 1, characterized in that, The blades adopt an arc-shaped gradient thickness design with a thickness of 8 or 10 mm at the root and 3 or 4 mm at the tip. The blade substrate is 304 stainless steel plate, which is formed by CNC cutting and milling by a five-axis machining center, and the blade contour error is ≤0.05 mm.

3. The self-cleaning impeller feeder according to claim 2, characterized in that, The wear-resistant scraper edge is chamfered at 45°. A hard alloy strip is embedded in the groove reserved at the chamfer and welded and fixed, and then subjected to stress-relieving annealing treatment at 300°C for 2 hours.

4. The self-cleaning impeller feeder according to claim 3, characterized in that, The gear assembly includes two meshing transmission gears, each of which is coaxially fixed to the shaft ends of the corresponding left impeller and right impeller via a positioning flange.

5. The self-cleaning impeller feeder according to claim 4, characterized in that, The blade surface is successively treated with sandblasting and degreasing before being coated with a polytetrafluoroethylene coating.

6. The self-cleaning impeller feeder according to claim 5, characterized in that, The drive assembly includes a drive motor with a speed reducer, the output end of which is connected to the shaft end of the right impeller, and a diaphragm overload protection clutch is built into the drive motor.

7. The self-cleaning impeller feeder according to claim 6, characterized in that, The preset values ​​for the dynamic clearance are 0.3 and 0.5 mm; the overload threshold of the diaphragm overload protection clutch is 1.2 times the rated torque, and the overload separation response time is ≤1 second.

8. The self-cleaning impeller feeder according to claim 7, characterized in that, The left and right impellers each have 6 blades.

9. The self-cleaning impeller feeder according to claim 8, characterized in that, The blades of two adjacent blades on the same impeller are connected by a curved surface transition. When the blades on the left and right impellers rotate, they are used to scrape and clean the material on their respective surfaces.

10. An assembly method for a self-cleaning impeller feeder, comprising the following steps: a. Blade pretreatment and wear-resistant structure assembly: The wear-resistant scraping edge of the blade is machined with a 45° chamfer and a groove is reserved. After embedding the hard alloy strip, it is welded and fixed. Then the blade is placed in a heating device for stress relief annealing at 300°C for 2 hours. b. Blade and impeller disk positioning and assembly: Fix the disks of the left and right impellers to the positioning fixture, use an angle gauge to calibrate the installation angle between adjacent blades to 60°, and use the fixture to ensure the arc-shaped surface transition connection at the root of adjacent blades on the same impeller; after assembly, check the gap between the blade and disk contact surface to ensure that the transition surface fits tightly. c. Coaxial assembly of gear assembly and impeller: Connect the two transmission gears coaxially to the shaft ends of the left and right impellers respectively through the positioning flange. Use a feeler gauge to calibrate the meshing clearance of the two gears to ensure that the positioning flange is firmly connected to the shaft end and that the gear transmission is smooth. d. Drive assembly and housing integration: Install the drive assembly on the outside of the housing at the position corresponding to the right impeller shaft end, and fix the output end of the reducer to the right impeller shaft end to ensure that the drive motor and reducer are assembled coaxially; e. Impeller and casing and dynamic clearance adjustment: Hoist the assembled left and right impellers to the cleaning area of ​​the casing, and calibrate the staggered phase of the two sets of blades using an angle gauge; f. Blade coating post-treatment and overall machine debugging: The assembled blade surface is sandblasted and degreased in sequence, and then a polytetrafluoroethylene coating is applied by electrostatic spraying process. After completion, run the test under no-load for 30 minutes and check that the speed difference between the left and right impellers is ≤0.1 r / min.

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