Floating scraper assembly and resistance-reducing wear-resisting scraper conveyor

Abstract

The invention relates to the technical field of scraper conveyors, in particular to a floating scraper assembly and an anti-drag wear-resistant scraper conveyor, which comprises a core assembly and a shell assembly, the shell assembly is provided with a guide structure along the length direction, the core assembly is in sliding fit with the guide structure, and the core assembly is provided with a connecting structure for connecting a scraper chain. Through the transverse sliding design between the core assembly and the shell assembly, the shell assembly is allowed to transversely move when being extruded by the bending section groove body, and the core assembly and the scraper chain can basically keep a linear state or reduce the bending degree. Additional resistance generated by excessive bending of the chain at the bending section is avoided, so that the running resistance of the whole transmission system is remarkably reduced, and the traction efficiency and the energy utilization rate are improved.

Description

Technical Field

[0001] This invention relates to the field of scraper conveyor technology, and more specifically, to a floating scraper assembly and a drag-reducing and wear-resistant scraper conveyor. Background Technology

[0002] The double-chain scraper conveyor (with two chains arranged parallel in the middle of the conveyor) is the preferred choice for modern long-distance, high-capacity, and highly reliable scraper conveyors. Driven synchronously by a drive sprocket, the two chains, through a scraper beam, drive the scraper, propelling the material forward within the central trough. The main structural components of the double-chain conveyor include: scraper, chain, and connecting parts (beam, E-bolts, etc.). The chain is the main component transmitting traction force, while the scraper connects the two chains and directly propels the material. Currently existing double-chain scraper conveyors use a fixed connection between the scraper and chain, resulting in a relatively fixed positional relationship and the following problems during operation: Currently, as the scraper conveyor moves forward in an "S" shape, the scraper chain experiences increased resistance in the following ways: 1) Lateral friction and compression resistance: In the curved section, the chain and scraper are no longer parallel to the chute's centerline, but instead experience continuous contact and friction with the chute's sidewalls. Furthermore, the scraper continuously squeezes and scrapes the chute's sidewalls during operation, generating significant frictional resistance. 2) Additional bending resistance: The chain is forced to bend in both horizontal and vertical directions. A chain moving in a straight line needs to overcome inertia and change direction at the bending point; this forced bending requires additional chain traction. Moreover, the chain experiences uneven rotation at the hinge point with the sprocket or scraper at the bend, generating jamming resistance. 3) At the S-bend inflection point, the gap between the scraper and the chute decreases, making chain jamming highly likely. At this point, the chain tension increases dramatically. Furthermore, due to uneven force distribution, chain slippage may also occur, increasing the risk of chain breakage. Therefore, when traditional scraper conveyors and scrapers are in an S-curve, the wear between the scraper and the chute intensifies due to the increase in additional resistance, the risk of chain jamming and breakage increases, the overall power consumption of the scraper conveyor increases, and the service life of the scraper conveyor is reduced.

[0003] Therefore, it is necessary to improve existing technologies. Summary of the Invention

[0004] To overcome the shortcomings of the existing technology, a floating scraper assembly and a drag-reducing and wear-resistant scraper conveyor are provided to reduce the resistance and wear caused by chain bending.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A floating scraper assembly includes a core assembly and a housing assembly. The housing assembly has a guide structure along its length. The core assembly slides in conjunction with the guide structure. The core assembly has a connecting structure for connecting a scraper chain.

[0006] Preferably, the outer shell assembly is provided with a through hole in the front-to-back direction for the scraper chain to pass through, and the guide structure includes a transverse sliding hole provided inside the outer shell assembly. The length of the transverse sliding hole is greater than the length of the core assembly. The core assembly is disposed in the transverse sliding hole and can slide left and right relative to the outer shell assembly. The outer casing assembly includes a detachably connected upper casing and a lower casing. The through hole and the transverse sliding hole are both formed by assembling the upper casing and the lower casing, and the transverse sliding hole and the through hole are interconnected.

[0007] Preferably, a rectangular countersunk hole I is provided at the middle of the upper end of the lower housing, and a planar or rectangular countersunk hole II that mates with the rectangular countersunk hole I is provided at the middle of the lower end of the upper housing.

[0008] Preferably, the lower end face of the lower housing is a plane, and screw holes are provided on the left and right sides of the upper end of the lower housing. Countersunk holes are provided on the left and right ends of the upper housing, and the countersunk holes are connected to the screw holes on the corresponding sides by screws.

[0009] Preferably, the core assembly includes a detachably connected upper core mold and a lower core mold. The upper core mold and the lower core mold are each provided with a semi-circular hole on the side that is close to each other. The semi-circular hole of the upper core mold and the corresponding semi-circular hole of the lower core mold are combined to form a limiting circular hole. The connection structure includes two limiting circular holes that limit the two sides of the scraper chain ring respectively. There are two connection structures.

[0010] Preferably, the upper core mold and the lower core mold are connected by countersunk bolts.

[0011] A drag-reducing and wear-resistant scraper conveyor includes a central trough of the scraper conveyor, a scraper chain and a scraper chain traction device, as well as the aforementioned floating scraper assembly.

[0012] Preferably, the scraper chain is a double chain, and the connecting structure is configured as two.

[0013] The beneficial effects of this invention compared to the prior art are as follows: 1. In this invention, by designing a floating scraper, the chain and sprocket centerlines are parallel in the curved section, which greatly reduces the lateral friction and squeezing resistance, additional bending resistance, and uneven force distribution between the scraper and the chute in S-bends of traditional scraper conveyors. This reduces the overall operating resistance and wear of the scraper conveyor, reduces the risk of chain skipping and jamming, lowers power consumption, and extends its service life.

[0014] 2. This invention, through a lateral sliding design between the core assembly and the outer shell assembly, allows the outer shell assembly to move laterally when compressed by the curved section groove, while the core assembly and scraper chain can remain essentially straight or have reduced bending. This avoids the additional tension generated by excessive bending of the chain in the curved section, thereby significantly reducing the operating resistance of the entire transmission system and improving traction efficiency and energy utilization.

[0015] 3. In traditional structures, the scraper ends experience intense positive compression and friction against the sidewalls of the chain track in the middle of the trough at the curved sections. The floating design of this invention allows the outer shell assembly to slide laterally in accordance with the curvature of the trough, significantly reducing the contact pressure and friction between the scraper shell and the sidewalls of the trough, thereby reducing wear on the scraper assembly itself and extending its service life.

[0016] 4. The outer shell assembly and the core assembly adopt a split structure, which greatly facilitates the assembly and disassembly of the scraper assembly itself, as well as its assembly with the scraper chain. The limiting circular hole design on the core assembly for connecting the scraper chain, and the optimized arrangement of countersunk bolts between the connecting structures, ensure the robustness and reliability of power transmission between the scraper chain and the floating scraper assembly. Attached Figure Description

[0017] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0018] Figure 1 A schematic diagram of a scraper conveyor pushing a chute; Figure 2 This is a schematic diagram of the operation of a traditional double-chain scraper conveyor. Figure 3 This is a schematic diagram of the working operation of the drag-reducing and wear-resistant scraper conveyor of the present invention; Figure 4 This is a schematic diagram of the scraper assembly installation. Figure 5 for Figure 4 A side view of the structure shown; Figure 6 a, Figure 6 b、 Figure 6 c represents schematic diagrams of the scraper assembly in the center, left, and right positions, respectively; Figure 7 This is a structural diagram of the core component; Figure 8 This is a structural diagram of the housing assembly; In the figure: 1-Core assembly; 11-Upper core mold; 12-Lower core mold; 13-Limiting hole; 14-Counterhead bolt; 2-Outer shell assembly; 21-Through hole; 22-Transverse sliding hole; 23-Upper shell; 24-Lower shell; 25-Rectangular countersunk hole I; 26-Screw; 3-Scraper chain; 4-Central trough of scraper conveyor; 5-Scraper assembly. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Example 1 like Figures 3 to 8 As shown, a floating scraper assembly includes a core assembly 1 and a housing assembly 2. The housing assembly 2 is provided with a guide structure along its length. The core assembly 1 is slidably engaged with the guide structure. The core assembly 1 is provided with a connecting structure for connecting a scraper chain 3.

[0021] When the core assembly 1 moves forward under the drive of the scraper chain 3, the core assembly 1 can drive the outer shell assembly 2 to move forward to achieve the material pushing operation. When the scraper conveyor moves forward in an "S" shape, causing the side of the outer shell assembly 2 to be squeezed against the curved section trough, the outer shell assembly 2 can move laterally relative to the core assembly 1 (or scraper chain 3) to reduce the contact force between the outer shell assembly 2 and the curved section trough.

[0022] To prevent interference between the scraper chain 3 and the outer casing assembly 2, the outer casing assembly 2 is provided with a through hole 21 in the front-back direction for the scraper chain 3 to pass through. The guide structure includes a transverse sliding hole 22 provided inside the outer casing assembly 2. The length of the transverse sliding hole 22 is greater than the length of the core assembly 1. The core assembly 1 is provided in the transverse sliding hole 22 and can slide left and right relative to the outer casing assembly 2.

[0023] To facilitate the assembly of the core component 1 and the outer shell component 2, the outer shell component 2 includes a detachably connected upper shell 23 and a lower shell 24. Specifically, the lower end face of the lower shell 24 is flat, and screw holes are provided on the left and right sides of the upper end of the lower shell 24. Countersunk holes are provided on the left and right ends of the upper shell 23, and the countersunk holes are connected to the screw holes on the corresponding side by screws 26.

[0024] Both the through hole 21 and the transverse sliding hole 22 are formed by assembling the upper shell 23 and the lower shell 24, with the transverse sliding hole 22 communicating with the through hole 21. Specifically, a rectangular countersunk hole I 25 is provided in the middle of the upper end of the lower shell 24, and a planar or rectangular countersunk hole II that mates with the rectangular countersunk hole I 25 is provided in the middle of the lower end of the upper shell 23. In this embodiment, a rectangular countersunk hole II is provided in the middle of the lower end of the upper shell 23, and the rectangular countersunk hole II and the rectangular countersunk hole I 25 mate with each other to form the transverse sliding hole 22.

[0025] To facilitate the connection between the scraper chain 3 and the core assembly 1, the core assembly 1 includes a detachably connected upper core mold 11 and a lower core mold 12, which are connected by countersunk bolts 14. Semicircular holes are provided on the sides of the upper core mold 11 and the lower core mold 12 that are close to each other. The semicircular holes of the upper core mold 11 and the corresponding semicircular holes of the lower core mold 12 are combined to form a limiting circular hole 13.

[0026] The connecting structure includes two adjacent limiting holes 13 that respectively limit the movement of the flat ring on both sides of the scraper chain 3. For a double-chain scraper conveyor, two connecting structures are provided. Preferably, at least one countersunk bolt 14 is located between the two limiting holes 13 of the connecting structure to ensure the reliability of the connection between the connecting structure and the scraper chain 3.

[0027] like Figure 1 As shown, during the operation of the scraper conveyor, "pushing the chute" refers to the operation of the pushing jacks on the hydraulic support after the coal mining machine has cut the coal, pushing the scraper conveyor chute towards the coal wall by a cutting depth B. During this pushing process, the scraper conveyor forms an "S"-shaped curved section.

[0028] like Figure 2 As shown, in the existing scraper conveyor, in the "S"-shaped bend of the chute, the scraper conveyor chain is located on both sides of the center of the scraper. When the chain spacing is 2D, the distance from the chain to the center of the scraper is D. The chain bends as the chute bends. The tension of the chain will generate additional "additional resistance".

[0029] like Figure 3 As shown, when the floating scraper assembly of this application is applied to a scraper conveyor, in the "S" bend section of the push conveyor, the scraper conveyor chain does not bend and remains straight. The distances of the chain from the center of the scraper are different, namely D1 and D2. The chain does not generate additional resistance to the scraper.

[0030] The floating scraper assembly has three different extreme operating states, such as Figure 6 As shown in (a), when the scraper conveyor is in a non-pushing state, the scraper chain is in the middle position driven by the scraper conveyor sprocket, the core of the scraper assembly is located in the middle position of the scraper assembly housing, and there is an equal gap L on both sides. Figure 6 As shown in (b) and 6(c), when the scraper conveyor is in the pushing state, the core of the scraper assembly is located in the non-middle position of the scraper assembly housing, and the maximum chain offset is L, which is greater than or equal to the maximum chute displacement (i.e., for...). Figure 1 As shown, L should be set as: L≥slot length * tan1°.

[0031] Example 2 A drag-reducing and wear-resistant scraper conveyor includes a central trough 4, a scraper chain 3, a scraper chain traction device, and a floating scraper assembly as described in Embodiment 1. The connection scheme of the central trough 4, the scraper chain 3, and the scraper chain traction device adopts the existing connection scheme for scraper conveyors. The floating scraper assembly and the scraper chain 3 are connected in the manner described in Embodiment 1.

[0032] When this floating scraper assembly is applied to a scraper conveyor, it effectively alleviates the positive extrusion and friction forces exerted by both ends of the scraper on the sidewalls of the chain track in the middle trough, extending the life of the scraper assembly and the middle trough. At the same time, it can reduce the bending and tension of the chain, improve transmission efficiency, and help to achieve efficient and energy-saving transportation of coal underground.

[0033] The above description only illustrates the preferred embodiments of the present invention. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention, and all such changes should be included within the protection scope of the present invention.

Claims

1. A floating scraper assembly, characterized in that: It includes a core assembly (1) and a shell assembly (2). The shell assembly (2) has a guide structure along its length. The core assembly (1) slides with the guide structure. The core assembly (1) has a connecting structure for connecting the scraper chain (3).

2. The floating scraper assembly according to claim 1, characterized in that: The outer shell assembly (2) is provided with a through hole (21) in the front-back direction for the scraper chain (3) to pass through. The guide structure includes a transverse sliding hole (22) provided inside the outer shell assembly (2). The length of the transverse sliding hole (22) is greater than the length of the core assembly (1). The core assembly (1) is provided in the transverse sliding hole (22) and can slide left and right relative to the outer shell assembly (2). The outer shell assembly (2) includes a detachably connected upper shell (23) and lower shell (24). The through hole (21) and the transverse sliding hole (22) are both formed by the upper shell (23) and the lower shell (24), and the transverse sliding hole (22) and the through hole (21) are interconnected.

3. A floating scraper assembly according to claim 2, characterized in that: The lower housing (24) has a rectangular countersunk hole I (25) at the middle of its upper end, and the upper housing (23) has a planar or rectangular countersunk hole II that mates with the rectangular countersunk hole I (25) at the middle of its lower end.

4. A floating scraper assembly according to claim 2, characterized in that: The lower end face of the lower housing (24) is flat, and screw holes are provided on the left and right sides of the upper end of the lower housing (24). Countersunk holes are provided on the left and right ends of the upper housing (23). The countersunk holes are connected to the screw holes on the corresponding side by screws (26).

5. A floating scraper assembly according to claim 1, characterized in that: The core assembly (1) includes a detachably connected upper core mold (11) and lower core mold (12). The upper core mold (11) and the lower core mold (12) are provided with semi-circular holes on their respective sides. The semi-circular holes of the upper core mold (11) and the corresponding semi-circular holes of the lower core mold (12) are combined to form limiting holes (13). The connection structure includes two limiting holes (13) that limit the two sides of the scraper chain (3) ring respectively. There are two connection structures.

6. A floating scraper assembly according to claim 5, characterized in that: The upper core mold (11) and the lower core mold (12) are connected by countersunk bolts (14).

7. A drag-reducing and wear-resistant scraper conveyor, comprising a central trough (4) of the scraper conveyor, a scraper chain (3) and a scraper chain traction device, characterized in that: It also includes a floating scraper assembly as described in any one of claims 1 to 6.

8. The drag-reducing and wear-resistant scraper conveyor according to claim 7, characterized in that: The scraper chain (3) is a double chain, and the connection structure is set to two.

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