Wear-resistant double-edge hob

Abstract

The utility model relates to shield cutter technology field especially relates to a wear -resisting type double -edged cutter, including cutter ring, the section of cutter ring is trapezoidal structure, the both sides of cutter ring are provided with limiting mechanism, the periphery of cutter ring is provided with a plurality of first wear -resistant edges and second wear -resistant edges, a plurality of first wear -resistant edges and a plurality of second wear -resistant edges are staggered arrangement, and the height of first wear -resistant edge is greater than the height of second wear -resistant edge, the utility model discloses the cutter ring of trapezoidal section, utilize stress dispersion effect, even transmission to the deep part of matrix along the slope of impact load, cooperate the axial constraint of limiting mechanism, make cutter ring keep stable cutting posture under complex working condition, in the cutting process of rock debris, first wear -resistant edge as main cutting edge bears main crushing function, and its higher edge body structure effectively prolongs the service life of cutter ring core working surface, and second wear -resistant edge as auxiliary cutting unit, through the lower edge height formation ladder type wear compensation mechanism.

Description

Technical Field

[0001] This utility model relates to the field of tunnel boring machine cutterhead technology, and in particular to a wear-resistant double-edged cutterhead. Background Technology

[0002] Tunnel boring machines (TBMs) and shield tunneling machines (TBMs) are the core equipment for modern tunnel construction. Their rock-breaking efficiency and engineering costs mainly depend on the service performance of their key consumable component, the cutter head. The cutter head rolls and shears rock under extremely high loads, and the long-term reliability of its cutter ring directly determines the tunneling distance per cutter replacement, equipment utilization rate, and total construction cost.

[0003] As tunnel engineering develops towards deeper and more complex geological conditions, traditional cutterheads often face problems such as rapid wear of the cutter ring and chipping of the cutting edge during the excavation process, resulting in a shortened maintenance cycle and increased construction costs. Currently, the main solution is to weld a wear-resistant coating around the cutter ring to improve its wear resistance. However, the bonding strength between the wear-resistant treatment layer on the cutter ring surface and the substrate is limited, and it is prone to peeling off under long-term high-load wear.

[0004] Therefore, to address the above issues, a wear-resistant double-edged hob can be designed. By optimizing the cutting edge structure and adding a double wear-resistant ridge structure to the cutting edge of the cutter ring, the impact resistance, wear resistance, installation stability, and working reliability under high temperature conditions of the hob can be comprehensively improved, thereby extending the tool life and ensuring the efficiency and continuity of tunnel excavation operations. Utility Model Content

[0005] To overcome the problems of rapid wear of the cutter ring and chipping of the cutting edge that traditional cutterheads often face during tunneling, which leads to a shortened maintenance cycle and increased construction costs, a wear-resistant coating is welded onto the outside of the cutter ring to improve wear resistance. However, the wear-resistant coating has limited bonding strength with the substrate and is prone to peeling off under long-term high-load wear.

[0006] The technical solution of this utility model is as follows: a wear-resistant double-edged hob includes a cutter shaft, a bearing, and a cutter hub. The cutter hub is disposed around the cutter shaft and is rotatably connected to the cutter shaft through the bearing. It also includes a cutter ring sleeved around the cutter hub. The cutter ring has a trapezoidal cross-section. Limiting mechanisms are provided on both sides of the cutter ring. A plurality of first wear-resistant ridges and second wear-resistant ridges are provided circumferentially around the cutter ring. The plurality of first wear-resistant ridges and the plurality of second wear-resistant ridges are arranged alternately, and the height of the first wear-resistant ridges is greater than the height of the second wear-resistant ridges.

[0007] Preferably, the rotational assembly between the cutter hub and the cutter shaft is achieved through bearings, and the cutter hub supports and installs the cutter ring. When the trapezoidal cutter ring impacts the rock, the huge reaction force is transmitted more evenly to the deep part of the cutter ring base along the inclined surface of the trapezoid, avoiding excessive stress concentration at the tip and greatly reducing the risk of edge chipping. At the same time, its wide base provides excellent lateral support rigidity, making the cutter less prone to deflection or vibration during tunneling, and making the operation more stable. The axial limiting mechanism of the cutter ring further prevents uneven wear. During the cutting of rock chips, the first wear-resistant edge, as the main cutting edge, undertakes the main crushing function. Its high prism structure effectively extends the service life of the core working surface of the cutter ring. The second wear-resistant edge, as an auxiliary cutting unit, forms a stepped wear compensation mechanism through its lower edge height. When the main edge wears down to the same level as the auxiliary edge, the auxiliary edge automatically takes over as the new main cutting edge, realizing the adaptive wear balance of the cutter ring.

[0008] Preferably, the blade ring base, the first wear-resistant edge, and the second wear-resistant edge are all integrally formed from cemented carbide material.

[0009] Preferably, the cutting edge of the blade ring, the surface of the first wear-resistant edge and the second wear-resistant edge are all coated with a TiN or TiAlN composite coating.

[0010] Preferably, the sidewall of the cutter ring is welded with several reinforcing ribs, which are evenly arranged circumferentially around the axis of the cutter ring.

[0011] Preferably, the bearing is made of silicon nitride ceramic material.

[0012] Preferably, an end cover is provided between the end face of the cutter hub and the cutter shaft. The surface of the end cover is provided with an oil injection hole, which is a threaded hole with an oil plug connected inside by a thread.

[0013] Preferably, the outer periphery of the blade hub is provided with two sets of positioning grooves, and each set of positioning grooves is engaged with a set of retaining rings.

[0014] Preferably, the lower end face of the cutter ring has beveled surfaces on both sides, and the contact surface between the retaining ring and the cutter ring has a corresponding beveled surface.

[0015] The beneficial effects of this utility model are: When the trapezoidal cutter ring impacts rock, the enormous reaction force is transmitted more evenly to the deep part of the cutter ring base along the inclined surface of the trapezoid, avoiding excessive stress concentration at the tip and greatly reducing the risk of edge chipping. At the same time, its wide base provides excellent lateral support rigidity, making the cutter less prone to deflection or vibration during excavation, resulting in smoother operation. The axial limiting mechanism further prevents uneven wear of the cutter ring. During rock cutting, the first wear-resistant edge, as the main cutting edge, undertakes the main crushing function. Its high prism structure effectively extends the service life of the core working surface of the cutter ring. The second wear-resistant edge, as an auxiliary cutting unit, forms a stepped wear compensation mechanism through its lower edge height. When the main edge wears down to the same level as the auxiliary edge, the auxiliary edge automatically takes over as the new main cutting edge, achieving adaptive wear balance of the cutter ring. Attached Figure Description

[0016] Figure 1 The diagram shown is a first three-dimensional structural schematic of the wear-resistant double-edged hob of this utility model; Figure 2 The diagram shown is a second three-dimensional structural schematic of the wear-resistant double-edged hob of this utility model; Figure 3 The diagram shown is a third-dimensional structural schematic of the wear-resistant double-edged hob of this utility model. Figure 4 The diagram shown is a three-dimensional structural schematic of the wear-resistant double-edged hobbing cutter clamping assembly of this utility model; Explanation of reference numerals in the attached drawings: 1. Cutter shaft; 2. Bearing; 3. Cutter hub; 301. Positioning groove; 4. Cutter ring; 401. First wear-resistant ridge; 402. Second wear-resistant ridge; 403. Reinforcing rib; 5. Snap ring; 6. End cap; 601. Oil injection hole; 602. Oil plug. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Please see Figure 1 , Figure 2 and Figure 4This utility model provides an embodiment: a wear-resistant double-edged hob, including a cutter shaft 1, a bearing 2, and a cutter hub 3. The cutter hub 3 is disposed around the cutter shaft 1 and is rotatably connected to the cutter shaft 1 via the bearing 2. It also includes a cutter ring 4 sleeved around the cutter hub 3. The cutter ring 4 has a trapezoidal cross-section. Limiting mechanisms are provided on both sides of the cutter ring 4. A plurality of first wear-resistant ridges 401 and second wear-resistant ridges 402 are arranged circumferentially around the outer periphery of the cutter ring 4. The plurality of first wear-resistant ridges 401 and second wear-resistant ridges 402 are arranged alternately, and the height of the first wear-resistant ridges 401 is greater than the height of the second wear-resistant ridges 402. The bearing 2 enables the rotational assembly between the cutter hub 3 and the cutter shaft 1, and the cutter hub 3 supports and installs the cutter ring 4. When the cutting edge of the trapezoidal cutter ring 4 impacts rock, the enormous reaction force... The stress is transmitted more evenly to the deep part of the cutter ring 4 base along the trapezoidal slope, avoiding excessive local concentration of stress at the tip of the cutting edge and greatly reducing the risk of edge chipping. At the same time, its wide base provides excellent lateral support rigidity, making the cutter less prone to deflection or vibration during tunneling, and making the operation more stable. The axial limiting mechanism of the cutter ring 4 further prevents uneven wear. During the cutting of rock chips, the first wear-resistant edge 401 serves as the main cutting edge and undertakes the main crushing function. Its high prism structure effectively extends the service life of the core working surface of the cutter ring 4. The second wear-resistant edge 402 serves as an auxiliary cutting unit. Through the lower edge height, a stepped wear compensation mechanism is formed. When the main edge wears down to the same level as the auxiliary edge, the auxiliary edge automatically takes over as the new main cutting edge, realizing the adaptive wear balance of the cutter ring 4.

[0019] Please see Figure 1 and Figure 4 In this embodiment, the cutter ring 4 substrate, the first wear-resistant ridge 401, and the second wear-resistant ridge 402 are all integrally formed from cemented carbide material. The integral forming process using cemented carbide ensures excellent bonding strength and fatigue resistance between components, effectively avoiding the risk of detachment that may occur with separate structures. Simultaneously, the high hardness of cemented carbide significantly improves the wear resistance and impact resistance of the cutter ring 4, maintaining stable cutting performance even under harsh working conditions. TiN or TiA is deposited on the surfaces of the cutting edge, the first wear-resistant ridge 401, and the second wear-resistant ridge 402 of the cutter ring 4. TiN / TiAlN composite coating; the TiN / TiAlN composite coating, through its dense nanostructure, forms a low-friction coefficient protective barrier at the cutting interface, effectively reducing the adhesive wear of rock cuttings on the cutting edge. At the same time, the high-temperature stability of the coating can resist the local high temperature generated during tunneling, delaying thermal fatigue failure, and enabling the cutter ring 4 to maintain sharpness and dimensional stability during high-speed cutting. The sidewalls of the cutter ring 4 are welded with several reinforcing ribs 403, which are evenly circumferentially arranged around the axis of the cutter ring 4. The reinforcing ribs 403 can effectively improve the structural strength of the cutter ring 4.

[0020] Please see Figure 2 and Figure 3In this embodiment, the bearing 2 is made of silicon nitride ceramic material. Due to its self-lubricating properties and low-density, high-strength characteristics, the silicon nitride ceramic bearing 2 can reduce vibration caused by centrifugal force under high-speed rotation conditions, reducing internal friction loss. Simultaneously, its corrosion resistance can withstand acidic or alkaline media erosion in the tunneling environment, ensuring long-term operational accuracy and improving system reliability. An end cover 6 is provided between the end face of the cutter hub 3 and the cutter shaft 1. An oil injection hole 601 is provided on the surface of the end cover 6. The oil injection hole 601 is a threaded hole, with an oil plug 602 threadedly connected inside. The integrated design of the end cover 6 and the threaded oil injection hole 601 forms a closed lubrication channel, allowing precise control of the amount of lubricating grease injected. The distribution and sealing structure of the oil plug 602 not only prevent lubricant leakage but also prevent impurities from entering the bearing 2 cavity. Two sets of positioning grooves 301 are provided on the outer periphery of the cutter hub 3. A set of retaining rings 5 ​​are engaged inside each of the two sets of positioning grooves 301. The lower end face of the cutter ring 4 has a bevel structure on both sides, and the contact surface between the retaining ring 5 and the cutter ring 4 is a corresponding bevel structure. The axial double locking structure of the double positioning grooves 301 and the retaining rings 5, together with the radial support of the retaining rings 5, improves the installation stability of the cutter ring 4 under complex working conditions. The wedge-shaped fit design of the bevel contact replaces the traditional point contact with surface contact. When the cutter ring 4 is subjected to eccentric wear force during operation, the bevel structure will provide a reaction force to maintain the stability of the cutter ring 4.

[0021] Through the above steps, the trapezoidal cross-section of the cutter ring 4 utilizes the stress dispersion effect to uniformly transfer the impact load along the inclined plane to the deep part of the substrate. Combined with the axial constraint of the limiting mechanism, the cutter ring 4 maintains a stable cutting posture under complex working conditions. During the cutting of rock chips, the first wear-resistant ridge 401 serves as the main cutting edge and undertakes the main crushing function. Its higher ridge structure effectively extends the service life of the core working surface of the cutter ring 4. The second wear-resistant ridge 402 serves as an auxiliary cutting unit, forming a stepped wear compensation mechanism through its lower ridge height. This addresses the problem that traditional cutters often face the issue of excessive wear and edge breakage of the cutter ring 4 during tunneling, leading to a shortened maintenance cycle and increased construction costs. While wear resistance can be improved by overlaying a wear-resistant coating on the outside of the cutter ring 4, the bonding strength between the wear-resistant treatment layer and the substrate is limited, making it prone to peeling off under long-term high-load wear.

[0022] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. 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.

Claims

1. A wear-resistant double-edged hob, comprising a cutter shaft (1), a bearing (2), and a cutter hub (3), wherein the cutter hub (3) is disposed around the cutter shaft (1), and the cutter hub (3) is rotatably connected to the cutter shaft (1) via the bearing (2), characterized in that: It also includes a cutter ring (4) fitted around the cutter hub (3). The cutter ring (4) has a trapezoidal cross section. Limiting mechanisms are provided on both sides of the cutter ring (4). Several first wear-resistant ridges (401) and second wear-resistant ridges (402) are provided around the periphery of the cutter ring (4). The several first wear-resistant ridges (401) and several second wear-resistant ridges (402) are arranged alternately, and the height of the first wear-resistant ridge (401) is greater than the height of the second wear-resistant ridge (402).

2. The wear-resistant double-edged hob according to claim 1, characterized in that: The blade ring (4) base, the first wear-resistant edge (401) and the second wear-resistant edge (402) are all integrally formed from cemented carbide material.

3. The wear-resistant double-edged hob according to claim 1, characterized in that: The cutting edge of the blade ring (4), the first wear-resistant edge (401), and the second wear-resistant edge (402) are all coated with TiN or TiAlN composite coating.

4. The wear-resistant double-edged hob according to claim 2, characterized in that: The sidewall of the cutter ring (4) is welded with several reinforcing ribs (403), which are evenly arranged circumferentially around the axis of the cutter ring (4).

5. The wear-resistant double-edged hob according to claim 1, characterized in that: The bearing (2) is made of silicon nitride ceramic material.

6. The wear-resistant double-edged hob according to claim 1, characterized in that: An end cover (6) is provided between the end face of the cutter hub (3) and the cutter shaft (1). An oil injection hole (601) is provided on the surface of the end cover (6). The oil injection hole (601) is a threaded hole, and an oil plug (602) is connected to its internal thread.

7. The wear-resistant double-edged hob according to claim 1, characterized in that: Two sets of positioning grooves (301) are provided on the outer periphery of the blade hub (3), and a set of retaining rings (5) are engaged inside the two sets of positioning grooves (301).

8. A wear-resistant double-edged hob according to claim 6, characterized in that: The lower end face of the cutter ring (4) has a beveled structure on both sides, and the contact surface between the retaining ring (5) and the cutter ring (4) has a corresponding beveled structure.

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