Friction strip type gangue falling prevention carrier roller structure for TBM belt conveyor

Abstract

The friction strip type waste rock falling prevention carrier roller structure for the TBM belt conveyor comprises an installation frame, transverse supporting plates are vertically and symmetrically connected between the bottom edges of the inner walls of the ends of the two long edges of the installation frame respectively, and rotatable upper carrier rollers are transversely suspended on the inner side faces of the two transverse supporting plates respectively along the long axis of the installation frame. Inclined strut assemblies are symmetrically arranged on the two sides of the upper carrier roller in the long edge direction of the mounting frame; the inclined supporting assembly comprises two inclined supporting plates which are perpendicularly connected to the top faces of the ends of the corresponding transverse supporting plates respectively, and the back faces of the inclined supporting plates are fixedly connected with the inner walls of the corresponding long edges of the installation frame in an abutting mode. Two steel channels which are in clearance abutting connection side by side are transversely and fixedly connected between the inclined faces of the two inclined supporting plates in an attached mode, and wear-resisting rubber strips are detachably clamped and matched in the steel channels. According to the utility model, the channel steel and the wear-resistant rubber strip which are fixedly mounted are adopted to replace the original rotatable and easily damaged inclined carrier roller, so that the problem that the inclined carrier roller is easily collapsed by pressing is solved.

Description

Technical Field

[0001] This utility model belongs to the technical field of TBM belt conveyors, and specifically relates to a friction strip type anti-drop idler structure for TBM belt conveyors. Background Technology

[0002] TBM (Tunnel Boring Machine) belt conveyors are important equipment used for transporting excavated material during tunnel construction. Their main function is to continuously and efficiently transport the excavated material generated during the TBM excavation process out of the tunnel.

[0003] The idler structure above the mounting frame of existing TBM belt conveyors is generally a three-section trough idler assembly, consisting of a central upper idler and two side inclined idlers. During operation, when the side inclined idlers are subjected to impacts from waste rock exceeding their design load or due to fatigue, they may break and detach. The detached idlers cause the belt edges to lose support, allowing waste rock to fall from there. When the TBM belt conveyor operates in a long, narrow, and partially enclosed space (TBM-conveyor belt conveyor), waste rock will fall from the unsupported edge of the conveyor belt into the narrow gap between the conveyor belt and the frame. Due to the confinement of the narrow and partially enclosed space, the trapped waste rock cannot be cleared in time, leading to waste rock accumulation or entangling between the rollers and the belt, creating localized high-pressure points. This directly causes belt scratches, abrasions, and even longitudinal tears. Simultaneously, waste rock accumulation causes belt misalignment, further exacerbating waste rock falling, causing conveyor belt wear and generating high temperatures, which can easily lead to a fire. This problem seriously leads to the need for long-term shutdowns to clean up gangue and frequent belt replacements during TBM construction, increasing construction costs. Utility Model Content

[0004] This utility model addresses the shortcomings of existing technologies by providing a friction strip type anti-slag drop idler structure for TBM belt conveyors. The specific technical solution is as follows:

[0005] This utility model provides a friction strip type anti-drop idler structure for TBM belt conveyors, including an installation frame. The bottom edge of the inner wall of the two long side ends of the installation frame is vertically and symmetrically connected with a cross brace. The inner side of the two cross braces is rotatable upper idler suspended in the transverse direction along the long axis of the installation frame. The two sides of the upper idler are symmetrically provided with diagonal brace components along the long side direction of the installation frame.

[0006] The diagonal bracing assembly includes two diagonal bracing plates that are vertically connected to the top surface of the corresponding cross bracing plate, and the back of the diagonal bracing plate is fixedly abutted against the inner wall of the corresponding long side of the mounting frame; two channel steels with parallel gaps are fixedly attached to the inclined surfaces of the two diagonal bracing plates, and wear-resistant rubber strips are detachably snapped into the channel steels.

[0007] As a preferred technical solution of this utility model, a long steel groove adapted to it is fixedly embedded in the middle of the bottom surface of the wear-resistant rubber strip, and a limiting protrusion is integrally and vertically symmetrically connected to the inner edge of the bottom opening of the long steel groove;

[0008] The long steel channel is fitted with a pressure strip through a gap, and the two sides of the pressure strip are pressed against the corresponding limiting protrusion. The two ends of the pressure strip are respectively fastened to the bottom surface of the corresponding channel steel by matching fastening bolts.

[0009] As a preferred technical solution of this utility model, the two channel steel end faces of the inclined brace assembly are positively engaged with U-shaped rods. The lower part of the two cantilever ends of the U-shaped rods are respectively symmetrically provided with square slots, which are longitudinally engaged with the slots and the slots are vertically fixed to the side of the corresponding channel steel.

[0010] As a preferred technical solution of this utility model, the two outer sides of the long steel channel are respectively connected vertically and symmetrically with anti-detachment protrusions, and the anti-detachment protrusions are fixedly embedded with wear-resistant rubber strips.

[0011] As a preferred embodiment of this utility model, the longitudinal section of the pressure strip is a T-shaped structure, and the width of the vertical part of the pressure strip is the same as the distance between the two limiting protrusions.

[0012] As a preferred technical solution of this utility model, the wear-resistant rubber strip has a high molecular weight polyethylene layer integrally bonded to its top surface.

[0013] As a preferred technical solution of this utility model, an upper stop roller is inclinedly suspended at the middle of the top edge of the inner wall of the long side of the mounting frame. The inclination of the upper stop roller is the same as the inclination of the wear-resistant rubber strip, and the top surface of the upper stop roller is higher than the top surface of the high molecular weight polyethylene layer.

[0014] As a preferred technical solution of this utility model, a lower support roller is suspended horizontally directly below the cross support plate, and the end of the lower support roller is rotatably connected to the corresponding longitudinal support block that is vertically fixed to the bottom surface of the long side of the mounting frame; lower stop rollers are vertically and symmetrically suspended on the inner sides of the ends of the two lower support rollers respectively.

[0015] As a preferred technical solution of this utility model, a matching conveyor belt is wound between the upper idler, the wear-resistant rubber strip, and the lower idler.

[0016] The beneficial effects of this utility model are:

[0017] This utility model relates to a friction strip-type anti-rockfall idler structure for TBM belt conveyors. It replaces the original rotatable and easily damaged inclined idler with a fixed-installation channel steel and wear-resistant rubber strips. The wear-resistant rubber strip itself has high elasticity and toughness, while the channel steel provides robust support. When large pieces of rock impact, the wear-resistant rubber strip undergoes elastic deformation to absorb the impact force, unlike metal inclined idler rollers which are less likely to be bent, broken, or cause bearing damage. This solves a series of problems caused by the collapse of inclined idler rollers, such as rock jamming, belt damage, belt misalignment, and high-temperature fires caused by jamming friction.

[0018] The wear-resistant rubber strip provides a continuous, low-friction planar support surface, forming a trough structure with the upper idler roller. This structure does not hinder the operation of the conveyor belt, prevents the falling of gangue during transport, and protects the upper idler roller from damage. The smooth rubber surface of the wear-resistant rubber strip itself causes less wear on the conveyor belt than the metal roller surface, and it is less likely to scratch the conveyor belt surface. In addition, the wear-resistant rubber strip is also flame-retardant. Attached Figure Description

[0019] Figure 1 A three-dimensional structural schematic diagram of the present invention is shown;

[0020] Figure 2 A schematic diagram of the wear-resistant rubber strip in this invention is shown;

[0021] Figure 3 It shows Figure 2 Enlarged view of the structure at part A in the middle;

[0022] Figure 4 A schematic diagram of the structure of two side-by-side channel steels in this utility model is shown;

[0023] Figure 5 It shows Figure 4 Enlarged view of the structure of part B in the middle;

[0024] Figure 6 The main structural view of this utility model is shown;

[0025] Figure 7 A three-dimensional structural schematic diagram of the conveyor belt of this utility model is shown;

[0026] Figure 8 The diagram shows a top view of the structure of the conveyor belt of this utility model.

[0027] The diagram shows: 1. Mounting frame; 11. Horizontal support plate; 12. Longitudinal support block; 2. Upper idler roller; 3. Diagonal brace assembly; 31. Diagonal support plate; 32. Channel steel; 321. Pressure strip; 322. Fastening bolt; 323. U-shaped rod; 3231. Slot; 324. Block; 33. Wear-resistant rubber strip; 331. Long steel channel; 3311. Limiting protrusion; 3312. Anti-detachment protrusion; 332. Polyethylene layer; 4. Upper retaining roller; 5. Lower idler roller; 6. Lower retaining roller; 7. Conveyor belt. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this utility model.

[0029] Example 1

[0030] To address the technical problems in the background section, the following friction strip type anti-slag drop idler structure for TBM belt conveyors is provided:

[0031] Combination Figures 1-8 As shown, the friction strip type anti-slag roller structure for TBM belt conveyor includes a mounting frame 1. Horizontal support plates 11 are vertically and symmetrically connected between the bottom edges of the inner walls of the two long sides of the mounting frame 1. Rotatable upper rollers 2 are suspended laterally along the long axis of the mounting frame 1 on the inner sides of the two horizontal support plates 11. Inclined bracing components 3 are symmetrically arranged on both sides of the upper rollers 2 along the long side of the mounting frame 1.

[0032] The diagonal bracing assembly 3 includes two diagonal bracing plates 31 that are vertically connected to the top surface of the corresponding end of the cross bracing plate 11, and the back of the diagonal bracing plate 31 is fixedly abutted against the inner wall of the corresponding long side of the mounting frame 1; two channel steels 32 are horizontally fixedly attached between the inclined surfaces of the two diagonal bracing plates 31 with a gap between them, and wear-resistant rubber strips 33 are detachably snapped into the channel steels 32.

[0033] In the above technical solution, the friction strip type anti-rockfall idler structure for TBM belt conveyors replaces the original rotatable and easily damaged inclined idlers with fixed-installation channel steel 32 and wear-resistant rubber strips 33. The wear-resistant rubber strips 33 themselves have high elasticity and toughness, and the channel steel 32 provides robust support. When large pieces of rock impact, the wear-resistant rubber strips 33 will undergo elastic deformation to absorb the impact force, and are not easily bent, broken, or have their bearings damaged like metal inclined idlers; thus solving a series of problems such as rock jamming, belt damage, belt misalignment, and high-temperature fires caused by jamming friction, which are easily crushed by inclined idlers.

[0034] The wear-resistant rubber strip 33 provides a continuous, low-friction planar support surface, forming a trough structure together with the upper idler roller 2. This structure does not hinder the operation of the conveyor belt 7, prevents the gangue from falling off during transport, and protects the upper idler roller 2 from being crushed. The smooth rubber surface of the wear-resistant rubber strip 33 itself causes less wear on the conveyor belt 7 than the metal roller surface, and is less likely to scratch the surface of the conveyor belt 7. In addition, the wear-resistant rubber strip 33 is also flame-retardant.

[0035] like Figure 1 , Figure 7 and Figure 8 As shown, a lower support roller 5 is horizontally suspended directly below the cross support plate 11. The end of the lower support roller 5 is rotatably connected to the longitudinal support block 12, which is vertically fixed to the bottom surface of the long side of the mounting frame 1. Lower guide rollers 6 are vertically and symmetrically suspended on the inner sides of the ends of the two lower support rollers 5. A matching conveyor belt 7 is wound around the upper support roller 2, the wear-resistant rubber strip 33, and the lower support roller 5.

[0036] In the above technical solution, the lower guide roller 6, together with the upper idler roller 2 and the wear-resistant rubber strip 33, constitute the transmission assembly of the conveyor belt 7. The lower idler roller 5 provides continuous and stable rolling support for the conveyor belt 7 on the return section, preventing the conveyor belt 7 from sagging or shaking and reducing running resistance. The longitudinal support block 12 directly transmits the force of the lower idler roller 5 to the mounting frame 1, enhancing the overall structural rigidity and preventing the lower idler roller 5 from deforming due to belt tension or impact from gangue. The lower guide roller 6 vertically constrains the lateral displacement of the conveyor belt 7 from both sides, and together with the upper guide roller 4, prevents the conveyor belt 7 from running off-track due to vibration, uneven load, or jamming. The conveyor belt 7 is also made of flame-retardant materials.

[0037] Example 2

[0038] Combination Figures 1-7 As shown, based on the above embodiments, this embodiment further provides the following:

[0039] In this embodiment, as Figures 2-6 As shown, a long steel groove 331 that is adapted to it is fixedly embedded in the middle of the bottom surface of the wear-resistant rubber strip 33, and a limit protrusion 3311 is integrally and vertically symmetrically connected to the bottom opening of the long steel groove 331.

[0040] The long steel channel 331 is fitted with a pressure strip 321 through a gap, and the two sides of the pressure strip 321 are pressed against the corresponding limiting protrusion 3311. The two ends of the pressure strip 321 are respectively fastened to the bottom surface of the corresponding channel steel 32 by a fastening bolt 322 that is adapted to it.

[0041] In the above technical solution, the bottom of the wear-resistant rubber strip 33 is invertedly embedded with a long steel groove 331, and the long steel groove 331 is provided with a limiting protrusion 3311; it is matched with an independent pressure strip 321 and a vertical fastening bolt 322. In this way, by loosening the fastening bolt 322, raising the pressure strip 321, the long steel groove 331 of the wear-resistant rubber strip 33 is directly passed through the pressure strip 321, the pressure strip 321 is lowered so that its side is close to the limiting protrusion 3311, and the bolt 322 is tightened. The whole process does not require laborious hammering from the side or aligning multiple holes, and the operation is simple and quick. The clearance fit between the long steel groove 331 and the pressure strip 321, as well as the constraint of the side of the pressure strip 321 on the limiting protrusion 3311, together ensure that the wear-resistant rubber strip 33 and the channel steel 32 can be detachably installed and fixed.

[0042] The tightened fastening bolts 322 press the two sides of the pressure strip 321 tightly against the upper surface of the limiting protrusion 3311 at the bottom of the long steel channel 331. The downward pulling force generated by the fastening bolts 322 is converted into a downward restraining force on the limiting protrusion 3311 through the pressure strip 321; this firmly locks the wear-resistant rubber strip 33 into the channel steel 32, preventing it from loosening, jumping, or popping upward during operation. This restraining force acts directly on the long steel channel 331 structure into which the wear-resistant rubber strip 33 is embedded, avoiding localized tearing damage to the wear-resistant rubber strip 33 itself.

[0043] The pressure strip 321 and fastening bolt 322 are both located below the wear-resistant rubber strip 33 and embedded in the channel steel 32. The long steel channel 331 and the wear-resistant rubber strip 33 are integrated into the design, so that the fixing structure is completely hidden inside the channel steel 32 and below the wear-resistant rubber strip 33. This will not create new protrusions or obstacles on the running path of the conveyor belt 7, and eliminate the potential risk of scraping the conveyor belt 7 or getting stuck with gangue.

[0044] The main wear-resistant component is still the wear-resistant rubber strip 33 itself; the pressure strip 321 and the fastening bolt 322, as fixing components, are protected and not easily damaged. When the wear-resistant rubber strip 33 wears out and needs to be replaced, simply loosen the fastening bolt 322, remove the old strip, and replace it with a new one. The fixing components are usually reusable, resulting in low maintenance costs.

[0045] like Figures 4-6 As shown, the two end faces of the diagonal brace assembly 3 are engaged with a U-shaped rod 323. The lower part of the two cantilever ends of the U-shaped rod 323 is symmetrically provided with square slots 3231. The slots 3231 are engaged with the locking blocks 324 that are vertically fixed to the side of the corresponding channel steel 32 in a longitudinal engagement.

[0046] In the above technical solution, the U-shaped rod 323 is positioned across the ends of the two channel steels 32. The tight engagement of the slot 3231 and the locking block 324 forms a rigid axial stop. This directly prevents the wear-resistant rubber strip 33 from sliding or shifting along the length of the channel steel 32 under the axial friction force generated by the operation of the conveyor belt 7.

[0047] During installation, simply align the slot 3231 of the U-shaped rod 323 with the locking block 324 and lower or push it into place; disassembly is done by reversing the operation. The entire process is extremely simple and requires no tools such as wrenches.

[0048] like Figure 3 As shown, the two outer sides of the long steel channel 331 are respectively vertically and symmetrically connected with anti-detachment protrusions 3312, and the anti-detachment protrusions 3312 are fixedly embedded with the wear-resistant rubber strip 33.

[0049] In the above technical solution, the anti-detachment protrusion 3312 can better ensure that the wear-resistant rubber strip 33 and the long steel groove 331 are tightly connected, preventing them from separating.

[0050] like Figure 5 As shown, the longitudinal section of the pressure strip 321 is a T-shaped structure, and the width of the vertical part of the pressure strip 321 is the same as the distance between the two limiting protrusions 3311.

[0051] The above technical solution enables the pressure strip 321 to more reliably fix the long steel groove 331 and the wear-resistant rubber strip 33.

[0052] like Figure 3 As shown, the wear-resistant rubber strip 33 has a high molecular weight polyethylene layer 332 integrally bonded to its top surface.

[0053] In the above technical solution, the surface of the high molecular weight polyethylene layer 332 is smooth and does not damage the conveyor belt 7, thus better protecting the conveyor belt 7.

[0054] like Figure 1 , Figure 6 and Figure 7 As shown, an upper stop roller 4 is inclinedly suspended at the middle of the top edge of the inner wall of the long side of the mounting frame 1. The inclination of the upper stop roller 4 is the same as the inclination of the wear-resistant rubber strip 33, and the top surface of the upper stop roller 4 is higher than the top surface of the high molecular weight polyethylene layer 332.

[0055] In the above technical solution, the upper guide roller 4 can prevent the conveyor belt 7 from deviating during operation and can also guide the conveyor belt 7 in a rolling manner.

[0056] Working principle and usage process of this utility model:

[0057] In use, this utility model is first installed on the inner side of the cross brace 11 of the mounting frame 1, and a rotatable upper roller 2 is installed. The top of both ends of the cross brace 11 is vertically welded with diagonal brace 31 so that its back is in close contact with the inner wall of the long side of the frame. Two side-by-side channel steels 32 are horizontally fixed between the inclined surfaces of the diagonal brace 31 on both sides.

[0058] Then, the wear-resistant rubber strip 33 (with a high molecular weight polyethylene layer 332 attached to its top surface) pre-embedded in the long steel channel 331 is inserted into the channel steel 32; the pressure strip 321 is inserted into the long steel channel 331, and the vertical part of the pressure strip 321 is pressed tightly against the inner side of the limiting protrusion 3311; the pressure strip 321 is pulled down with the fastening bolt 322 and locked to the bottom surface of the channel steel 32; a U-shaped rod 323 is installed at the end of the channel steel 32 and is engaged with the locking block 324 through the locking groove 3231 to prevent the wear-resistant rubber strip 33 from moving axially.

[0059] Finally, the lower idler roller 5 is installed below the horizontal support plate 11 via the longitudinal support block 12; vertical lower guide rollers 6 are symmetrically installed on the inner side of the end of the lower idler roller 5. The upper guide roller 4 is installed obliquely on the top edge of the long side of the mounting frame 1; the conveyor belt 7 is wound around the upper idler roller 2, the wear-resistant rubber strip 33 and the lower idler roller 5 to form a closed conveying loop.

[0060] During operation, the gangue generated by the TBM tunneling falls onto the trough section of the conveyor belt 7, which is formed by the upper idler roller 2 and the wear-resistant rubber strips 33 on both sides. The continuous planar support of the wear-resistant rubber strips 33 prevents the gangue from falling, and the high-molecular polyethylene layer 332 reduces the friction of the conveyor belt 7. The upper stop roller 4 limits the deviation of the upper edge of the conveyor belt 7. The lower stop roller 6 restrains the lower edge of the return conveyor belt 7. The lower idler roller 5 provides rolling support for the return conveyor belt 7, reducing sagging resistance. When large pieces of gangue impact, the wear-resistant rubber strips 33 absorb energy through elastic deformation, preventing collapse. The fixing structure formed by the pressure strip 321 and the U-shaped rod 323 ensures that the wear-resistant rubber strips 33 do not shift, eliminating the risk of gangue jamming.

[0061] During maintenance, remove the U-shaped rod 323 and loosen the fastening bolt 322; lift the high pressure bar 321 and pull out the old wear-resistant rubber strip 33; insert the new wear-resistant rubber strip 33, reset the pressure bar 321 and tighten the bolt, and snap the U-shaped rod back in place.

[0062] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A friction strip type anti-slag roller structure for TBM belt conveyors, including a mounting frame (1), characterized in that: The mounting frame (1) has horizontal support plates (11) vertically and symmetrically connected between the bottom edges of the inner walls of the two long sides. The inner sides of the two horizontal support plates (11) are respectively suspended with rotatable upper rollers (2) along the long axis of the mounting frame (1). The upper rollers (2) are respectively symmetrically provided with diagonal support components (3) along the long side of the mounting frame (1). The diagonal bracing assembly (3) includes two diagonal bracing plates (31) that are vertically connected to the top surface of the corresponding horizontal bracing plate (11), and the back of the diagonal bracing plate (31) is fixedly abutted against the inner wall of the corresponding long side of the mounting frame (1); two channel steels (32) with parallel gaps are fixedly attached to the inclined surfaces of the two diagonal bracing plates (31), and wear-resistant rubber strips (33) are detachably snapped into the channel steels (32).

2. The friction strip type anti-slag drop idler structure for TBM belt conveyors according to claim 1, characterized in that: The wear-resistant rubber strip (33) has a long steel groove (331) that is adapted to it fixedly embedded in the middle of the bottom surface. The long steel groove (331) has a limit protrusion (3311) that is integrated vertically and symmetrically connected along the bottom edge of the long steel groove (331). A pressure strip (321) is inserted into the long steel channel (331) with a gap, and the two sides of the pressure strip (321) are pressed against the corresponding limiting protrusion (3311). The two ends of the pressure strip (321) are respectively fastened to the bottom surface of the corresponding channel steel (32) by fastening bolts (322) that are adapted to it.

3. The friction strip type anti-slag drop idler structure for TBM belt conveyors according to claim 2, characterized in that: The two channel steels (32) of the diagonal bracing assembly (3) are connected to a U-shaped rod (323) in a forward-facing engagement. The lower part of the two cantilever ends of the U-shaped rod (323) is symmetrically provided with square slots (3231). The slots (3231) are longitudinally engaged with the locking blocks (324) that are vertically fixed to the side of the corresponding channel steel (32).

4. The friction strip type anti-slag drop idler structure for TBM belt conveyors according to claim 2, characterized in that: The two outer sides of the long steel channel (331) are respectively vertically and symmetrically connected with anti-detachment protrusions (3312), and the anti-detachment protrusions (3312) are fixedly embedded with the wear-resistant rubber strip (33).

5. The friction strip type anti-slag drop idler structure for TBM belt conveyors according to claim 2, characterized in that: The longitudinal section of the pressure strip (321) is a T-shaped structure, and the width of the vertical part of the pressure strip (321) is the same as the distance between the two limiting protrusions (3311).

6. The friction strip type anti-slag drop idler structure for TBM belt conveyors according to claim 1, characterized in that: The wear-resistant rubber strip (33) has an integrally bonded high molecular weight polyethylene layer (332) on its top surface.

7. The friction strip type anti-slag drop idler structure for TBM belt conveyors according to claim 6, characterized in that: The mounting frame (1) has an upper stop roller (4) suspended at the middle of the top edge of the long inner wall. The inclination of the upper stop roller (4) is the same as that of the wear-resistant rubber strip (33), and the top surface of the upper stop roller (4) is higher than the top surface of the high molecular weight polyethylene layer (332).

8. The friction strip type anti-slag drop idler structure for TBM belt conveyors according to claim 1, characterized in that: A lower support roller (5) is suspended horizontally directly below the cross support plate (11). The end of the lower support roller (5) is rotatably connected to the longitudinal support block (12) which is vertically fixed to the bottom surface of the long side of the mounting frame (1). Lower stop rollers (6) are vertically and symmetrically suspended on the inner side of the ends of the two lower support rollers (5).

9. The friction strip type anti-slag drop idler structure for TBM belt conveyors according to claim 8, characterized in that: A matching conveyor belt (7) is wound around the upper idler (2), wear-resistant rubber strip (33), and lower idler (5).

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