CN217380556U - Disc cutter of tunnel boring machine - Google Patents
Disc cutter of tunnel boring machine Download PDFInfo
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- CN217380556U CN217380556U CN202221347830.8U CN202221347830U CN217380556U CN 217380556 U CN217380556 U CN 217380556U CN 202221347830 U CN202221347830 U CN 202221347830U CN 217380556 U CN217380556 U CN 217380556U
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- cutter
- shaft
- outer sleeve
- bearing
- roller
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Abstract
The utility model provides a tunnel boring machine disk hobbing cutter in tunnel boring machine field. The cutter comprises a cutter body, a cutter ring embedded on the cutter body, a retainer ring for fixing the cutter ring, a cutter shaft assembled in the cutter body, a locking end cover for locking the cutter shaft, an end cover for fastening the cutter body and a floating seal accommodated by the end cover; the inner wall of the cutter body is provided with an outer sleeve hole assembly outer sleeve, the cutter shaft is provided with a rectangular ring groove for accommodating the roller, the outer sleeve and the rectangular ring groove correspond to form an annular channel, a closed cavity is formed between the outer sleeve and the rectangular ring groove, the roller is in contact with the outer sleeve and the rectangular ring groove together, and the roller and the outer sleeve form a roller bearing without an inner ring and are arranged between the cutter shaft and the cutter body; the cutter shaft is provided with a bearing platform, and a thrust bearing is assembled on the bearing platform. The utility model arranges the rectangular ring groove installation roller on the cutter shaft, increases the diameter of the cutter shaft and the width of the bearing surface, and improves the bearing capacity of the disc cutter; a thrust bearing is arranged on the cutter shaft to decompose the axial force of the disc cutter. The disc cutter is suitable for being used as a disc cutter of a tunnel boring machine.
Description
Technical Field
The utility model relates to a hobbing cutter in tunnel boring machine field especially relates to a tunnel boring machine dish hobbing cutter.
Background
The disc-shaped hob of the tunnel boring machine is arranged on a cutterhead, a hob ring is wedged into rock under the thrust action of the cutterhead, then the hob passively rotates along with the rotation of the cutterhead to realize continuous rock breaking, and the disc-shaped hob rotates around the central shaft of the cutterhead on one hand and rotates around the axis of the disc-shaped hob on the other hand; under the action of thrust and torque of the cutter head, the disc cutter cuts a series of concentric circular grooves on the face of the rock, and the disc cutter completes one-time rock breaking process.
The disc cutter is a cutter with a replaceable cutter ring, main supporting and sealing parts such as a tapered roller bearing, a floating seal and the like are arranged in the existing disc cutter, the cutter needs to be pre-tightened before use, and the installation is complicated and time-consuming; the sealing requirement is strict, and leakage of the lubricant can cause serious consequences such as failure of the hob and the like; simultaneously, because the cutter body of hobbing cutter is great, also relatively great with the required power of other cutting rocks. Generally, due to the relatively large radial dimension of the disc cutter, the current design is not satisfactory for cutting devices that are limited in position and do not provide sufficient thrust.
The bearing is used as an important component of the disc cutter, the price is high, the service life is limited, in addition, the load of the cutter is deeply influenced by the load of the bearing, when the hardness of rock is high, the tunnel boring machine cannot increase the thrust to push the cutter continuously because the load of the bearing is small, and the cutter can only grind a cutter ring on the basis.
The service life of the hob directly influences the construction progress, risk and construction cost of the project, and the most important point of failure mode of the hob in the construction of the tunnel boring machine is bearing damage. It is known that hob bearings are replaced frequently, and when the bearings reach extreme operating times, the bearings are replaced with new ones even if they are not damaged. Not only is time and labor consuming, but also the cost is increased. How to solve the problem of frequent bearing replacement, increase the tunneling time and improve the tunneling efficiency is worth deeply researching by manufacturers of tunnel boring machines.
Referring to the attached figure 1 of the specification, the conventional disc cutter is internally provided with a tapered roller bearing, a cutter shaft penetrates through the bearing, and two ends of the cutter shaft are additionally provided with closed end covers to seal the bearing. The disc cutter drives the cutter ring to rotate through the tapered roller bearing, and when the disc cutter works, the disc cutter is subjected to the tangential friction force of the cutter ring and the action of the interaction force in the lateral direction besides the circumferential positive pressure of the cutter ring, so that the stress is complex. However, the inventor finds the following problems in the construction process:
1. the load capacity of the bearing directly influences the load capacity of the disc cutter, when the hardness of rock is high, the load which can be borne by the bearing is small, so that the shield tunneling machine cannot increase the thrust to propel the disc cutter continuously, the disc cutter can only grind a cutter ring on the basis, rock cannot be effectively broken, the cutter ring is abraded, and early failure of the cutter is easily caused;
2. the bearing damage is caused by the overweight load of the bearing in the hob, so that the disc hob can not work normally, the rock breaking effect is influenced, and the construction progress is delayed;
3. the service life of the bearing in the hob is limited, and the bearing needs to be replaced regularly after reaching the limit running time, so that time and labor are wasted, and the cost is increased.
4. When the hob is passively rotated, the contact surface between the cutter ring and rocks is large, the friction force is large, the resistance is large, the rotation of the bearing in the hob is not smooth enough, the tunneling efficiency is low, the conditions that the hob cutter ring is broken and the abrasion is too fast are easily caused, and the service life of the hob is greatly reduced.
5. When the inside bearing of hobbing cutter was changed, the dismouting flow is loaded down with trivial details, and the bearing inner race need use special desk-top press extrusion, and the construction process requirement is higher, will ensure leakproofness and rotation smoothness nature simultaneously, with changing the degree of difficulty big.
Disclosure of Invention
In order to solve at least one of the above-mentioned background art problems, the utility model provides a tunnel boring machine dish hobbing cutter. The disc cutter is provided with the roller bearing without the inner ring by assembling the cylindrical roller and the outer sleeve in the cutter body, and is combined with the thrust bearing to replace the tapered roller bearing, the cutter shaft and the cutter body directly serve as a rolling body of the cylindrical roller, the bearing of the disc cutter is increased, the axial force of the cutter shaft is counteracted, the service life of the disc cutter is not limited by the running time of the bearing, and the service life of the disc cutter is prolonged; the cylindrical roller moves smoothly in the rectangular annular groove cavity of the cutter shaft, and when the cutter ring is worn in place, the hob can be continuously used only after the cutter ring is replaced. The technical problem of a disc hob of a tunnel boring machine is solved.
The utility model provides a scheme that technical problem adopted is:
the disc-shaped hob for the tunnel boring machine comprises a hob body, a hob ring embedded on the hob body, a retaining ring for fixing the hob ring, a cutter shaft assembled in the hob body, a locking end cover for locking the cutter shaft, an end cover for fastening the hob body and a floating seal accommodated by the end cover; an outer sleeve hole is formed in the inner wall of the cutter body, an outer sleeve is assembled in the outer sleeve hole, a rectangular ring groove is formed in the cutter shaft, and a roller is accommodated in the rectangular ring groove; the outer sleeve and the rectangular ring groove correspondingly form an annular channel, a closed cavity is formed between the outer sleeve and the rectangular ring groove, the roller is in contact with the outer sleeve and the rectangular ring groove together, and the roller and the outer sleeve form a roller bearing without an inner ring and are arranged between the cutter shaft and the cutter body; the cutter shaft is provided with a shaft platform, and a thrust bearing is assembled on the shaft platform.
In order to further solve the technical problem to be solved by the invention, in the cutter body provided by the invention, stepped holes are arranged at two ends of the inner wall of the cutter body for installing the end covers, a transition hole is arranged in the middle of the inner wall of the cutter body, and the two sides of the transition hole are provided with the outer sleeve holes for installing the outer sleeve.
Further, the cutter shaft is a symmetrical stepped shaft, a shaft shoulder is arranged in the middle of the cutter shaft, the shaft platforms are arranged on two sides of the shaft shoulder, rectangular ring grooves are formed in the shaft platforms, and two ends of the cutter shaft are fixedly connected through the end covers and the locking end covers; the thrust bearing is installed on the boss, and the side face of the shaft shoulder is axially limited to the thrust bearing.
The utility model has the advantages that the roller is installed by arranging the rectangular ring groove on the cutter shaft, and the outer sleeve, the roller and the cutter shaft form a rolling bearing structure without an inner ring, thereby replacing a tapered roller bearing, increasing the diameter of the cutter shaft and the width of a bearing surface and improving the bearing capacity of the disc cutter; meanwhile, a thrust bearing is arranged on the cutter shaft, so that the axial force applied to the disc cutter during working is effectively decomposed; the combination of the rolling bearing and the thrust bearing improves the limit of bearing load and prolongs the service life of the disc cutter. The disc cutter is suitable for being used as a disc cutter of a tunnel boring machine.
Drawings
FIG. 1 is a front sectional view of a conventional disc cutter;
fig. 2 is a front sectional view of the present invention.
In the figure, 1, a cutter body, 11, an outer sleeve hole and 12 transition holes;
2. a cutter ring;
3. a retainer ring;
4. a cutter shaft, 41 shaft shoulders, 42 shaft platforms and 43 rectangular ring grooves;
5. an end cap;
6. locking the end cover;
7. floating sealing;
8. roller, 8.0. tapered roller bearing;
9. outer sleeve, 91, seal groove;
10. and a thrust bearing.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in the figure, the disc-shaped hob of the tunnel boring machine comprises a cutter body 1, a cutter ring 2 embedded on the cutter body 1, a retainer ring 3 for fixing the cutter ring 2, a cutter shaft 4 assembled in the cutter body 1, a locking end cover 6 for locking the cutter shaft 4, an end cover 5 for fastening the cutter body 1, and a floating seal 7 accommodated in the end cover 5; an outer sleeve hole 11 is formed in the inner wall of the cutter body 1, an outer sleeve 9 is assembled in the outer sleeve hole 11, a rectangular ring groove 43 is formed in the cutter shaft 4, a roller 8 is accommodated in the rectangular ring groove 43, the outer sleeve 9 and the rectangular ring groove 43 correspondingly form an annular channel, a closed cavity is formed between the outer sleeve 9 and the rectangular ring groove 43, the roller 8, the outer sleeve 9 and the outer sleeve 9 are in contact with each other together, and the roller 8 and the outer sleeve 9 form a roller bearing without an inner ring and are installed between the cutter shaft 4 and the cutter body 1; the arbor 4 is provided with an arbor table 42, and the arbor table 42 is provided with a thrust bearing 10.
In a preferred embodiment, the cutter ring 2 is fixed on the cutter body 1 through the retaining ring 3, the cutter body 1 can rotate relative to the cutter shaft 4 through the roller 8 and the thrust bearing 10, the roller 8 and the outer sleeve 9 form an inner ring-free roller and are combined with the thrust bearing 10 to form a combined bearing, instead of the tapered roller bearing 8.0, the combined bearing is not limited by the tapered roller bearing selected in the prior art, the inner ring of the bearing is not used, the diameter of the cutter shaft 4 and the width of the outer sleeve 9 are increased, the load limit which can be born by the disc cutter is improved, and the combined bearing is not influenced by the load limit of the bearing; the thrust bearing can effectively decompose the axial force applied to the disc cutter during working, so that the roller 8 can rotate in the rectangular ring groove cavity more smoothly. Thereby leading the cutter ring to rotate smoothly and improving the rock breaking efficiency. The service life of the disc cutter is effectively prolonged, the disc cutter can be continuously used only by replacing the cutter ring 2, and the installation is convenient and rapid.
In order to guarantee the utility model discloses the stability of structure, 1 inner wall both ends of cutter body are provided with the shoulder hole installation end cover 5 1 inner wall middle part of cutter body is equipped with transition hole 12, 12 both sides in transition hole set up outer cover hole 11 is installed overcoat 9.
In the preferred embodiment, the outer sleeve holes 11 spaced by the transition holes 12 in the cutter body 1 eliminate the tapered roller retainer rings in the prior art, and this structure facilitates the machining of the outer sleeve 12 and meets the requirement of coaxiality.
In order to further ensure the structural stability of the utility model, the cutter shaft 4 is a symmetrical stepped shaft, a shaft shoulder 41 is arranged in the middle of the cutter shaft, the shaft shoulders 42 are arranged on two sides of the shaft shoulder 41, a rectangular ring groove 43 is arranged on the shaft shoulder 42, and two ends of the cutter shaft 4 are fixedly connected through the end cover 5 and the locking end cover 6; the thrust bearing 10 is mounted on the pillow block 42, and the side surface of the shaft shoulder 41 axially limits the thrust bearing 10.
The end covers 5 and the locking end covers 6 are arranged at two ends of the cutter shaft 4 for assembly, so that the cutter shaft is non-directional in installation, simple and convenient to use and quick to disassemble; and the single-sided floating seal 7 is used for sealing, so that the cost is further reduced.
In the preferred embodiment, the knife shaft 4 is a stepped shaft, and the shoulder 41 is in clearance fit with the transition hole 12; therefore, the diameter of the cutter shaft 4 is increased, the strength of the cutter shaft 4 is improved, and the cutter body 1 is stably supported.
In order to optimize the structure of the utility model, the outer sleeve 9 is a shaft sleeve, the inner wall of the outer sleeve is provided with an annular cavity for accommodating the roller 8, and the outer surface of the outer sleeve is provided with a sealing groove 91 for installing a sealing ring; the inner cavity of the cutter body 1 is sealed and isolated from the external environment, so that the roller 8 and the thrust bearing are prevented from being damaged by external invasion impurities, and the service life of the combined bearing is prolonged.
In order to optimize the structure of the present invention, the array of rollers 8 is arranged uniformly in the rectangular ring groove 43, and in the preferred embodiment, the rollers 8 are arranged in three rows.
In order to optimize the structure of the present invention, the thrust bearing 10 is a cylindrical thrust roller bearing, a tapered thrust roller bearing, or a needle roller thrust bearing.
As a conventional technical option, the thrust bearing 10 is oppositely assembled on two sides of the shaft shoulder 41, and the tight rings are abutted against two sides of the shaft shoulder 41 to decompose the axial force applied to the disc cutter during operation.
Preferably, the cutter ring 2 can be assembled with a single-edge cutter ring or a multi-edge cutter ring according to construction requirements.
The utility model discloses a theory of operation:
the cutter shaft is provided with the rectangular ring groove embedded with the roller, the inner ring of the tapered roller bearing is eliminated, a roller bearing structure without the inner ring is formed, the diameters of the roller and the cutter shaft are increased, and the bearing capacity of the disc cutter is improved.
The thrust bearing is arranged on the cutter shaft to offset the axial force of the cutter shaft, the cutter ring smoothly rotates, and the stability of the disc cutter is improved.
The utility model has the characteristics that:
1. because the rectangular ring groove is arranged on the cutter shaft for mounting the roller, the inner ring of the bearing is eliminated; therefore, the outer sleeve, the roller and the cutter shaft form a rolling bearing structure without an inner ring, the rolling bearing structure replaces a tapered roller bearing, the diameter of the cutter shaft and the width of a bearing surface are increased, and the bearing capacity of the disc cutter is improved.
2. Because the thrust bearing is arranged on the cutter shaft, the thrust bearing has the function of offsetting the axial force of the cutter shaft; therefore, the axial force applied to the disc cutter during working is effectively decomposed, the combination of the rolling bearing and the thrust bearing improves the limit of bearing load, and the service life of the disc cutter is prolonged.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and variations can be made in the embodiments or in part of the technical features of the embodiments without departing from the spirit and the scope of the invention.
Claims (9)
1. The disc-shaped hob for the tunnel boring machine comprises a hob body (1), a hob ring (2) embedded on the hob body (1), a retaining ring (3) for fixing the hob ring (2), a cutter shaft (4) assembled in the hob body (1), a locking end cover (6) for locking the cutter shaft (4), an end cover (5) for fastening the hob body (1), and a floating seal (7) accommodated by the end cover (5); the method is characterized in that:
an outer sleeve hole (11) is formed in the inner wall of the cutter body (1), an outer sleeve (9) is assembled in the outer sleeve hole (11), a rectangular ring groove (43) is formed in the cutter shaft (4), and the roller (8) is accommodated in the rectangular ring groove (43); the outer sleeve (9) and the rectangular ring groove (43) correspondingly form an annular channel, a closed cavity is formed between the outer sleeve (9) and the rectangular ring groove (43), the roller (8) is in contact with the outer sleeve (9) and the rectangular ring groove (43) together, and the roller (8) and the outer sleeve (9) form a roller bearing without an inner ring and are arranged between the cutter shaft (4) and the cutter body (1); the cutter shaft (4) is provided with a shaft platform (42), and the shaft platform (42) is provided with a thrust bearing (10).
2. The tunnel boring machine disc cutter according to claim 1, characterized in that:
the cutter body (1) inner wall both ends are provided with the shoulder hole installation end cover (5) cutter body (1) inner wall middle part is equipped with transition hole (12), transition hole (12) both sides set up overcoat hole (11) installation overcoat (9).
3. The tunnelling machine disk cutter as claimed in claim 2, which is characterized in that:
the cutter shaft (4) is a symmetrical stepped shaft, a shaft shoulder (41) is arranged in the middle of the cutter shaft, the shaft shoulders (41) are arranged on two sides of the shaft shoulder (42), a rectangular ring groove (43) is arranged on the shaft shoulder (42), and two ends of the cutter shaft (4) are fixedly connected through the end cover (5) and the locking end cover (6); the thrust bearing (10) is mounted on the pillow block (42), and the side face of the shaft shoulder (41) axially limits the thrust bearing (10).
4. A tunnel boring machine disc cutter according to claim 3 wherein:
the shaft shoulder (41) on the cutter shaft (4) is in clearance fit with the transition hole (12).
5. The tunnelling machine disk cutter as claimed in claim 1, which is characterized in that:
the outer sleeve (9) is a shaft sleeve, an annular cavity is formed in the inner wall of the outer sleeve to accommodate the roller (8), and a sealing groove (91) is formed in the outer surface of the outer sleeve to install a sealing ring.
6. The tunnelling machine disk cutter as claimed in claim 1, which is characterized in that:
the roller (8) array is uniformly arranged in the rectangular ring groove (43).
7. The tunnelling machine disk cutter as claimed in claim 1, which is characterized in that:
the thrust bearing (10) is a thrust cylindrical roller bearing, a thrust tapered roller bearing or a thrust needle roller bearing.
8. A tunnel boring machine disc cutter according to claim 3 wherein:
the thrust bearing (10) is relatively assembled on two sides of the shaft shoulder (41), and the tight rings abut against two sides of the shaft shoulder (41).
9. The tunnelling machine disk cutter as claimed in claim 1, which is characterized in that:
the cutter ring (2) can be assembled with a single-edge cutter ring or a multi-edge cutter ring according to construction requirements.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221347830.8U CN217380556U (en) | 2022-06-01 | 2022-06-01 | Disc cutter of tunnel boring machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221347830.8U CN217380556U (en) | 2022-06-01 | 2022-06-01 | Disc cutter of tunnel boring machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217380556U true CN217380556U (en) | 2022-09-06 |
Family
ID=83089237
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221347830.8U Active CN217380556U (en) | 2022-06-01 | 2022-06-01 | Disc cutter of tunnel boring machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217380556U (en) |
-
2022
- 2022-06-01 CN CN202221347830.8U patent/CN217380556U/en active Active
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