A scraper conveyor for viscous, hygroscopic, caking materials

Abstract

A kind of scraper conveyor for viscous, easy to be absorbed and to be blocked material, including head, tail, middle shell and scraper chain, the scraper of the scraper chain includes first toothed scraper, second toothed scraper, flat scraper, anti-sticking scraper, first toothed scraper, second toothed scraper, flat scraper, anti-sticking scraper are arranged along the direction of track of scraper chain interval, wherein, first toothed scraper, second toothed scraper outside are distributed with scraper tooth, and the scraper tooth of first toothed scraper, second toothed scraper is staggered distribution in vertical projection plane.The scraper conveyor for viscous, easy to be absorbed and to be blocked material provided in the utility model can avoid viscous material adhesion, overcome blocked material jam, improve running stability.

Description

Technical Field

[0001] This utility model relates to the field of buried scraper conveyors, and in particular to a scraper conveyor for viscous, moisture-absorbing and caking materials. Background Technology

[0002] For conveying viscous, moisture-absorbing, and easily caking materials (such as fertilizers, starch, sugar powder, damp coal powder, clay, etc.), the main challenges faced by traditional scraper conveyors include: Severe Adhesion and Residue: Materials readily adhere to the inner walls, bottom plate, scrapers, and chain / scraper connections of the conveyor. The adhesive layer thickens continuously, reducing the effective conveying cross-section, increasing running resistance, decreasing conveying efficiency, and even causing blockages. Cleaning is extremely difficult, affecting production continuity and increasing maintenance costs. Existing methods include using low-friction coefficient materials such as ultra-high molecular weight polyethylene as linings (a single measure with unsatisfactory results); spraying non-stick coatings such as Teflon onto the trough surface (high manufacturing cost and short service life); and periodic manual cleaning or high-pressure water washing (inefficient and impacting production).

[0003] Moisture absorption, clumping, and bridging: During transport, materials absorb moisture from the air, causing a sharp decrease in flowability and the formation of hard lumps. These lumps can become stuck between scrapers, accumulate in corners of the trough, or at the outlet, causing severe blockages (bridging) and forcing a shutdown for repair. Moisture-absorbed materials also exhibit stronger adhesion. Existing methods include wrapping the conveyor with insulation or heat tracing pipes to prevent condensation, or introducing dry, hot air inside the conveyor (high cost, high energy consumption, and potential impact on material properties); and installing anti-bridging devices (such as vibrators or agitators) at the top of the trough, but these methods have limited effectiveness and may exacerbate dust generation or damage the material. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide a scraper conveyor for sticky, moisture-absorbing and caking materials, which can prevent sticky materials from adhering, overcome the jamming of caking materials, and improve the stability of operation.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: A scraper conveyor for sticky, moisture-absorbing, and caking materials includes a head section, a tail section, an intermediate shell, and a scraper chain. The scrapers of the scraper chain include a first toothed scraper, a second toothed scraper, a flat scraper, and an anti-sticking scraper. The first toothed scraper, the second toothed scraper, the flat scraper, and the anti-sticking scraper are arranged at intervals along the trajectory direction of the scraper chain. The outer sides of the first toothed scraper and the second toothed scraper are all distributed with scraping teeth, and the scraping teeth of the first toothed scraper and the second toothed scraper are staggered on the vertical projection plane.

[0006] Wear-resistant blocks are fixed at the left and right corners of the upper end of the flat scraper.

[0007] The scraper chain uses a double-row bushing roller chain as the traction component.

[0008] The diameter of the roller in a sleeve roller chain is larger than the diameter of the chain rod.

[0009] Side liners are installed on both sides of the bearing cavity of the intermediate shell, and a bottom liner is installed on the bottom surface of the bearing cavity.

[0010] The side lining, bottom lining, and anti-stick scraper are all made of UHMWPE material.

[0011] The intermediate shell's carrying cavity and return cavity are separated by an intermediate partition.

[0012] The middle partition is fixed with an upper guide rail and a lower guide rail, which are in rolling contact with the sleeve roller chain of the scraper chain.

[0013] This utility model provides a scraper conveyor for sticky, moisture-absorbing, and caking materials, which has the following technical advantages: 1) Double-row scraper chain: ① This results in a more even load distribution, reducing the stress on individual chains and enabling high-capacity conveying or conveying materials with higher specific gravity. ② Enhanced impact resistance: When faced with large materials or sudden loads (such as clumping and jamming), the double-row chain reduces the risk of chain breakage by sharing the load. ③ Strong anti-deviation capability: The symmetrical structure of the double-row chain can offset the scraper chain deviation caused by tension deviation on one side of the chain. ④ Resistance to torsional loads: When conveying viscous or easily clumped materials, the scraper may experience uneven resistance; the double-row chain can balance the torsional torque and prevent chain twisting.

[0014] 2) Adopting a large roller sleeve roller chain: ① Smoother operation: Reduces meshing impact, and the meshing process between the large roller and the head and tail gear teeth is smoother. ② Enhanced wear resistance: Replacing sliding friction with rolling friction significantly improves the service life of the scraper chain and guide rail. ③ Lower noise: Replacing sliding friction with rolling friction reduces operating noise (10-15 decibels less than that of a forged chain). 3) Scraper chain with outward-facing high scraper: ① The high scraper increases the material contact area, improving conveying efficiency. ② The high scraper adopts a bending and welding integrated molding process, which makes it more rigid and resistant to bending than traditional welded scrapers, and can withstand greater material resistance. ③ Reinforcing ribs are added to the rear side of the high scraper to further prevent scraper deformation and extend its service life.

[0015] 4) A rigid partition separates the carrying chamber and the return chamber: ① Direct pressing effect: The partition is located above the carrying branch chain, mechanically restricting the chain's upward tendency caused by material agglomeration or adhesion. ② Dynamic stability: Even when the chain fluctuates slightly due to material resistance, the partition provides continuous downward pressure, maintaining smooth chain operation. ③ Optimized space utilization: The compact layout eliminates the traditional support rod of the return chamber. Upper and lower wear-resistant guide rails are welded to both sides of the partition, allowing the scraper chains of the carrying branch and return branch to slide on the upper and lower wear-resistant guide rails respectively, enabling a smaller vertical height and saving equipment installation space (especially suitable for situations where the feed height is limited).

[0016] 5) Both the base plate and side plates are lined with UHMWPE sheets: ① Excellent anti-stick properties: Significantly reduces material adhesion, thereby reducing the risk of material clumping. ② Excellent corrosion resistance: Can replace stainless steel materials in highly corrosive environments, greatly reducing costs. ③ Impact resistance and noise reduction: Reduces operating noise by 15-20 decibels.

[0017] 6) A combined design employing a cross-distribution of first-tooth scraper, second-tooth scraper, flat scraper, and anti-stick scraper: ① Multi-functional synergy: The cross-tooth scraper (metal material) excels at breaking up agglomerated materials. The flat scraper ensures the stability of the basic conveying system. The anti-stick scraper reduces material adhesion, lowering operating resistance and noise. ② Adaptive to material characteristics: The proportion of different scrapers can be adjusted according to material characteristics (e.g., increasing the number of anti-stick scrapers for sticky materials, and increasing the number of toothed scrapers for easily agglomerated materials) to achieve an integrated "anti-sticking-breaking-conveying" process. ③ Wear-resistant steel plates are welded to the two right-angled sections on the flat scraper used to scrape off material at the junction of the side and bottom liners. This effectively prevents material from agglomerating in the dead corners at the junction of the side and bottom liners, increasing abrasiveness and thus grinding the right angles on the scraper into rounded corners. This prevents material from intruding into the lower part of the scraper, raising the scraper chain, and increasing the risk of a floating chain.

[0018] In summary, by adopting the above structure: 1. Completely avoids material adhesion and blockage: The UHMWPE full lining + polymer scraper + partition isolation design completely solves the problem of sticky material adhesion, ensuring continuous unobstructed conveying channels, especially suitable for easily sticky materials such as white mud and wet clay. 2. Strongly overcomes the problem of clumping material jamming: Through the combination design of double-row chain load equalization + staggered tooth scraper + partition pressure plate, it effectively breaks up and deals with material clumping, solving the problems of chain jamming, chain skipping, and floating chain caused by clumping in traditional scraper conveyors, especially suitable for easily clumping materials such as fertilizers and mineral powders. 3. Significantly improves operational stability and service life: The synergistic effect of large roller sleeve roller chain + high scraper reinforcement structure + wear-resistant lining makes the equipment run more smoothly when conveying sticky / clumped materials, significantly reduces wear, and extends the maintenance cycle, especially suitable for high-load continuous operation conditions. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the present invention.

[0020] Figure 2 for Figure 1 Cross-sectional view at point A.

[0021] Figure 3 This is a left view of the scraper chain in this utility model.

[0022] Figure 4 This is a top view of the scraper chain in this utility model.

[0023] Figure 5 for Figure 3 Cross-sectional view at point B.

[0024] Figure 6 for Figure 3 Cross-sectional view at point C.

[0025] Figure 7 for Figure 3 Cross-sectional view at point D.

[0026] Figure 8 for Figure 3 Cross-sectional view at point E in the middle.

[0027] Figure 9 This is a top sectional view of the head in this utility model.

[0028] Figure 10 This is a top sectional view of the tail section of this utility model.

[0029] Figure 11 This is a schematic diagram showing the meshing of the scraper chain with the head wheel and tail wheel in this utility model.

[0030] In the diagram: Head 1, Head wheel 11, Head shaft 12, Transition section 2, Middle section 3, Middle partition 31, Upper guide rail 32, Lower guide rail 33, Side liner 34, Bottom liner 35, Scraper chain 4, Reinforcing plate 41, First tooth scraper 42, Scraper fixing back plate 43, Large roller sleeve roller chain 44, Second tooth scraper 45, Wear-resistant block 46, Flat scraper 47, Anti-stick scraper 48, Feed port 5, Tail end 6, Tail wheel 61, Tail shaft 62, Discharge port 7, Chain conveyor mechanism 8, Gear motor 9. Detailed Implementation

[0031] like Figure 1 As shown, a scraper conveyor for sticky, moisture-absorbing and caking materials includes a head section 1 and a tail section 6. An intermediate shell is installed between the head section 1 and the tail section 6. The intermediate shell includes a transition section 2 and an intermediate section 3. A scraper chain 4 is arranged inside the intermediate shell.

[0032] like Figure 1 , Figures 9-11 As shown, a head wheel assembly is installed inside the head 1, which includes a head wheel 11 and a head shaft 12. A tail wheel assembly is installed inside the tail 6, which includes a tail wheel 61 and a tail shaft 62. A scraper chain 4 is wound around the head wheel 11 and the tail wheel 61. A reduction motor 9 is installed above the head 1. The reduction motor 9 drives the head wheel assembly to rotate through a chain transmission mechanism 8. The head wheel assembly drives the scraper chain 4 to move linearly within the intermediate housing, and the scraper chain 4 drives the conveyed material to move horizontally.

[0033] like Figure 1 As shown, the bottom of the head 1 is provided with a discharge port 7, and the top of the middle section 3 is provided with a feeding port 5. After the material enters from the feeding port 5, it is scraped to the discharge port 7 by the scraper chain 4, thus completing the purpose of conveying the material from the inlet to the outlet.

[0034] like Figure 4 As shown, the scraper chain 4 uses two rows of sleeve roller chains as traction components, which makes the load distribution more uniform, improves the overall impact resistance of the scraper chain 4, and reduces the risk of chain breakage; the symmetrical structure of the double-row chain can offset the scraper chain 4 running off track caused by the tension deviation of the chain on one side; the double-row chain can balance the uneven resistance that the scraper may bear during operation and avoid the scraper chain 4 from twisting.

[0035] like Figure 3 As shown, the bushing roller chain uses a large roller bushing roller chain 44 with a roller diameter larger than the chain rod diameter. The large roller bushing roller chain 44 has rolling friction with the upper guide rail 32 and the lower guide rail 33. Compared with the traditional die-forged chain, this can significantly improve the service life of the scraper chain 4, the upper guide rail 32, and the lower guide rail 33, and greatly reduce operating noise. The large roller bushing roller chain 44 also makes the meshing process of the scraper chain 4 with the head wheel 11 and the tail wheel 61 smoother, reduces meshing impact, and improves running stability.

[0036] like Figures 5-8 As shown, the scraper chain 4 employs an alternating arrangement of first-tooth scraper 42, second-tooth scraper 45, flat scraper 47, and anti-stick scraper 48. The outer edges of the first-tooth scraper 42 and second-tooth scraper 45 are respectively machined with serrated contours, and these contours compensate for each other, allowing for the cleaning of agglomerated materials over a larger area and avoiding blind spots. Simultaneously, it ensures more even wear on the side liner 34 and bottom liner 35, preventing deep grooves from being scraped into them by a single scraper tooth tip. This combined design is flexible and adaptable, allowing the proportion of different functional scrapers to be adjusted according to material characteristics (e.g., increasing the number of anti-stick scrapers for sticky materials and increasing the number of toothed scrapers for easily agglomerated materials).

[0037] Preferably, the anti-stick scraper 48, the side liner 34, and the bottom liner 35 are all made of UHMWPE material.

[0038] like Figure 7 As shown, preferably, when the scraper chain 4 transports materials in the lower bearing cavity, a running gap must be left between the scraper chain 4 and the side liner 34 on the intermediate housing. Therefore, a dead angle exists at the junction of the side liner 34 and the bottom liner 35. This will cause the material to clump together in this dead angle. After the material clumps together, its abrasiveness increases, thereby accelerating the wear of the scraper. In this device, wear-resistant blocks 46 are welded onto the flat scraper 47 to prevent the right angles on the scraper from being ground into rounded corners, which would cause material to intrude into the lower part of the scraper, raise the scraper chain 4, and increase the risk of the chain floating.

[0039] like Figure 2 As shown, preferably, the bearing cavity and return cavity of the intermediate shell are separated by an intermediate partition 31. This mechanically restricts the upward tendency of the scraper chain 4 caused by material agglomeration or adhesion. When the scraper chain 4 fluctuates slightly due to material resistance, the intermediate partition 31 can provide continuous downward pressure to keep the scraper chain 4 running smoothly.

[0040] like Figure 2 As shown, preferably, a lower guide rail 33 is welded to the lower part of the middle partition 31. Even after the scraper chain 4 floats up, the large roller sleeve roller chain 44 on the scraper chain 4 and the lower guide rail 33 are subject to rolling friction, which can greatly reduce frictional resistance, reduce power consumption, and improve service life.

[0041] The combined design of the intermediate partition 31 and the large roller sleeve roller chain 44 is suitable not only for horizontal scraper conveyors but also for overall inclined scraper conveyors. The reason for its suitability for overall inclined scraper conveyors is that the scraper chain of such conveyors has a horizontal force component, making it more prone to chain levitation compared to horizontal conveyors. Therefore, the intermediate partition 31 is more effective in preventing chain levitation. It is also more suitable for C-type scraper conveyors because C-type scraper conveyors have curved sections. When the scraper chain passes through the bearing cavity of these curved sections, it inevitably exerts significant positive pressure on the intermediate partition. Therefore, the combined design of the intermediate partition 31 and the large roller sleeve roller chain 44 can greatly reduce frictional resistance, reduce power consumption, and improve service life.

Claims

1. A scraper conveyor for sticky, moisture-absorbing, and caking materials, comprising a head (1), a tail (6), an intermediate shell, and a scraper chain (4), characterized in that: The scraper chain (4) includes a first tooth scraper (42), a second tooth scraper (45), a flat scraper (47), and an anti-stick scraper (48). The first tooth scraper (42), the second tooth scraper (45), the flat scraper (47), and the anti-stick scraper (48) are arranged at intervals along the trajectory direction of the scraper chain (4). The outer sides of the first tooth scraper (42) and the second tooth scraper (45) are both distributed with scraping teeth, and the scraping teeth of the first tooth scraper (42) and the second tooth scraper (45) are staggered on the vertical projection plane.

2. The scraper conveyor for viscous, moisture-absorbing, and agglomerated materials according to claim 1, characterized in that: Wear-resistant blocks (46) are fixed at the left and right corners of the upper end of the flat scraper (47).

3. The scraper conveyor for viscous, moisture-absorbing, and agglomerated materials according to claim 1, characterized in that: The scraper chain (4) uses a double-row sleeve roller chain as the traction component.

4. A scraper conveyor for viscous, moisture-absorbing, and agglomerated materials according to claim 3, characterized in that: The diameter of the roller in a sleeve roller chain is larger than the diameter of the chain rod.

5. A scraper conveyor for viscous, moisture-absorbing, and agglomerated materials according to claim 1, characterized in that: Side liner plates (34) are installed on both sides of the bearing cavity of the intermediate shell, and bottom liner plates (35) are installed on the bottom surface of the bearing cavity.

6. A scraper conveyor for viscous, moisture-absorbing, and agglomerated materials according to claim 5, characterized in that: The side liner (34), bottom liner (35), and anti-stick scraper (48) are all made of UHMWPE material.

7. A scraper conveyor for viscous, moisture-absorbing, and agglomerated materials according to claim 1, characterized in that: The intermediate shell is separated from the bearing cavity and the return cavity by a middle partition plate (31).

8. A scraper conveyor for viscous, moisture-absorbing, and agglomerating materials according to claim 7, characterized in that: The middle partition (31) is fixed with an upper guide rail (32) and a lower guide rail (33) on the top and bottom respectively. The upper guide rail (32) and the lower guide rail (33) are in rolling contact with the sleeve roller chain of the scraper chain (4).

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