AU2017328222B2 - Telescopic gage disc cutter box - Google Patents
Telescopic gage disc cutter box Download PDFInfo
- Publication number
- AU2017328222B2 AU2017328222B2 AU2017328222A AU2017328222A AU2017328222B2 AU 2017328222 B2 AU2017328222 B2 AU 2017328222B2 AU 2017328222 A AU2017328222 A AU 2017328222A AU 2017328222 A AU2017328222 A AU 2017328222A AU 2017328222 B2 AU2017328222 B2 AU 2017328222B2
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- AU
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- Prior art keywords
- cutter box
- cutter
- box
- shaped block
- bolt
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- 238000009412 basement excavation Methods 0.000 abstract description 19
- 239000011435 rock Substances 0.000 abstract description 6
- 238000000034 method Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000005242 forging Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/08—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining with additional boring or cutting means other than the conventional cutting edge of the shield
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Earth Drilling (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
Disclosed is a telescopic gage disc cutter box. The cutter box can meet the large-diameter expanding excavation requirements of a TBM cutter head to deal with engineering geology with large buried depths and high rock convergence. The telescopic gage disc cutter box comprises the disc cutter (3), an inner cutter box (1), an outer cutter box (2) and a C-shaped block (4). A bolt hole is designed between the inner cutter box (1) and the outer cutter box (2). The inner and outer cutter boxes (1, 2) are connected by using a third bolt (12). A wedge-shaped block (5) and the C-shaped block (4) are mounted in the inner cutter box (1), and the two are used for fixing a disc cutter shaft; the wedge-shaped block (5) is connected to a tensioning block (6) via a first bolt (9), and the tensioning block (6) is mounted at a lower part of the outer cutter box (2); and the C-shaped block (4) is connected to the inner and outer cutter boxes (1, 2) through second bolts (13). By means of the relative movement of the inner cutter box and the outer cutter box, combined with the height increase of the C-shaped block, the cutter box realizes the large-diameter expanding excavation of the cutter head. The cutter box is reliable in structure, high in practicality and capable of meeting the extremely bad working conditions of tunnel faces.
Description
Telescopic Gage Disc Cutter Box
[0001] The present invention relates to the field of excavating and advancing equipment in tunnel construction, and more particularly relates to a gauge disc cutter box capable of realizing the large-diameter expanding excavation requirements of a TBM cutter head.
[0002] Under special geological conditions, TBM needs to expand the excavation diameter to solve the situation of the jammed machine caused by the convergence and collapse of rock. The traditional cutter head can be divided into two types of expansion and excavation: 1. by thickening the C-shaped blocks in the cutter box to expand the diameter of the excavation; 2. by moving the cutter box (movable cutter box), the disc cutter is mounted on in the reserved cutter box to form a new excavation trajectory, which increases the diameter of the excavation. However, both structures have fatal shortcomings: the first structure can only reach the 50mm (radial direction) additional expansion; the second structure can reach the 150mm (radial direction) additional expansion, but in practice, its structure is too complex, often gets stuck when moving the cutter box, so the practicality is poor.
[0003] In view of the above drawbacks, it is necessary to design a cutter head excavation device with large expansion and practicality.
[0004] The object of the present invention is to solve the above-mentioned deficiencies of the prior art, and to provide a telescopic gage disc cutter box, which can meet the requirement of large-diameter expansion of a TBM cutter head to deal with engineering geology with large depth and high rock convergence.
[0005] The technical solution of the present invention is realized as follows: a telescopic gage disc cutter box, including a disc cutter, an inner cutter box and an outer cutter box, wherein a bolt hole is provided between the inner cutter box and the outer cutter box to enable the inner cutter box and the outer cutter box to be connected by a third bolt, characterized in that, further comprising a wedge-shaped block, a C-shaped block and a tensioning block, wherein the wedge-shaped block and the C-shaped block are installed in the inner cutter box for fixing a cutter shaft of the disc cutter, wherein the tensioning block is installed in a lower part of the outer cutter box, wherein the wedge-shaped block is connected to the tensioning block by a first bolt, wherein the C-shaped block is connected to the inner cutter box and the outer cutter box by a second bolt.
[0006] The C-shaped block comprises at least two C-shaped blocks having different bottom thicknesses.
[0007] The telescopic gauge disc cutter box further comprises a spherical washer I mounted between the tensioning block and the first bolt, and a spherical washer II mounted between the wedge-shaped block and the first bolt.
[0008] The disc cutter is a single-edged cutter.
[0009] The present application realizes the large-diameter expansion of the cutter head by the relative movement of the inner and outer cutter boxes and the increase of the C shaped block, and the device has the advantages of reliable structure and strong practicability, and can meet the requirement of the extremely bad working condition of the tunnel face.
[0010] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only an example of the present invention, and other drawings can be obtained from those skilled in the art without any creative work.
[0011] FIG. 1 is a schematic diagram of the working state of the TBM in the actual tunnel face.
[0012] FIG. 2 is a schematic view of the present invention.
[0013] FIG. 3 is a sectional diagram along the A-A direction of FIG. 2.
[0014] FIG. 4 is a sectional diagram along B-B direction of FIG. 3.
[0015] FIG. 5 is a sectional diagram showing the using state of the present invention.
[0016] FIG. 6 is an exploded schematic view of the present invention.
[0017] FIG. 7 is a view showing a state in which the thickness of the C-shaped block is replaced.
[0018] FIG. 8 is a schematic view showing the replaced state of the present invention when the C-shaped block is assembled and the C-shaped block is replaced.
[0019] Wherein the drawing number 1 represents the inner cutter box, the drawing number 2 represents the outer cutter box, the drawing number 3 represents the disc cutter, the drawing number 4 represents the C-shaped block, the drawing number 5 represents the wedge-shaped block, the drawing number 6 represents the tensioning block, the drawing number 7 represents a ring, the drawing number 8 represents a nut, the drawing number 9 represents the first bolt, the drawing number 10 represents a combination of spherical washer I, the drawing number 11 represents a combination of spherical washer II, the drawing number 12 represents the third bolt, the drawing number 13 represents the second bolt, the drawing number 14 represents the shim block.
[0020] The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative work are within the scope of the present invention.
[0021] As shown in Fig. 1, in the actual construction, the tunnel face is composed of rock, so its instability is present, and the rock often falls from a high place. If a worker is working in the front of the tunnel face, there will be a high risk. So the replacement and the adjustment of the disc cutter are carried out inside the cutter head, called the back loading cutter.
[0022] CN Patent application No. 201310689220.5 mainly includes two methods for adjusting the height of the disc cutter: a disc cutter height adjustment method based on the shim and a disc cutter height adjustment method based on the positioning block, wherein the cutter device for the height adjustment method based on the positioning block has been eliminated in the hard rock TBM., the height adjustment method based on the shim to adjust the height of the disc cutter, has the following disadvantage: a low structural rigidity, a large contact surface, and a poor practicability. Moreover, in practice, such methods can only increase the height of the disc cutter by 50mm (single side). If the method is used to raise the disc cutter by 100mm (single side), the stability of the device is very poor and the cutter device is easy to be damaged. In addition, the structure designed by the method for adjusting the height of the gasket in the patent has high risk and difficulty in actual construction and application, which is as follows: when the cutter box is used, the height of the disc cutter is adjusted by removing the right bolt and replacing the gasket, but the bolt cannot be removed inside the cutter head, and the operator must work in the front of the tunnel face.
[0023] As shown in Fig.2 to 4 and 6, the telescopic gauge disc cutter box of the present invention comprises a disc cutter 3, an inner cutter box 1 and an outer cutter box 2, wherein a bolt hole is provided between the inner cutter box 1 and the outer cutter box to enable the inner cutter box 1 and the outer cutter box 2 to be connected by a third bolt 12, characterized in that, further comprising a wedge-shaped block 5, a C-shaped block 4 and a tensioning block 6, wherein the wedge-shaped block 5 and the C-shaped block 4 are installed in the inner cutter box 1 for fixing a cutter shaft of the disc cutter 3, wherein the tensioning block 6 is installed in a lower part of the outer cutter box 2, wherein the wedge-shaped block 5 is connected to the tensioning block 6 by a first bolt 9, wherein the C-shaped block 4 is connected to the inner cutter box 1 and the outer cutter box 2 by a second bolt 13.
[0024] In the present application, the inner cutter box and the outer cutter box are connected by 14 pieces bolt (M30), rather than the C-shaped block connected by two pieces bolt (M20), the rigidity and strength of the present application are much larger, so as to ensure the normal use of the disc cutter and avoid abnormal damage of the disc cutter.
[0025] Further, a shim block 14 is disposed between the inner cutter box 1 and the outer cutter box 2, and the inner cutter box 1, the shim block 14 and the outer cutter box 2 are connected by the third bolt 12; and when an expanding excavation is needed, the shim block 14 lifts the inner cutter box 1 relative to the outer cutter box 2, thereby achieving the expansion and excavation of the disc cutter.
[0026] As shown in FIG. 7, the C-shaped block 4 comprises a plurality of C-shaped blocks having different thicknesses. When it is necessary to expand the excavation, the C shaped block can be replaced with a large thickness at the bottom.
[0027] A spherical washer II 11 is mounted between the wedge-shaped block 5 and the first bolt 9, and a spherical washer I 10 is mounted between the tensioning block 6 and the first bolt 9.
[0028] The disc cutter 3 is a single-edged disc cutter.
[0029] As shown in Figs. 7 and 8, the present application combines the advantages of the conventional cutter head expansion type, through the relative movement of the inner cutter box and the outer cutter box, further combines the increase of the C-shaped block, thereby achieving large-diameter expansion of the cutter head;, so the structure is reliable and practical, and it can meet the requirement of the extremely harsh working environment of the tunnel face.
[0030] 1. The structural design and reliability of the present device are as follows:
[0031] (1). The cutter box of the device can be divided into an inner and an outer parts. During normal excavation, the inner cutter box is fixed on the outer cutter box by 14 M30x180-10.9 hexagonal bolts to ensure the connection reliability of the inner cutter box and outer cutter box, at the same time, a C-shaped block is installed on the inner cutter box for mounting the disc cutter.
[0032] When the cutter head is excavated, the force of the side cutter box is about 20% 40% larger than that of normal excavation, and it is subjected to a larger overturning moment. Therefore, the device has high strength and toughness and enhances the reliability ofuse, and wherein the outer cutter box is welded to the disc body of the cutter head by the Q345D forging, such that it has good weldability and high strength, wherein the inner cutter box is connected with the outer cutter box through bolts by 42CrMo forging, such that it has high strength and better toughness.
[0033] From the results of finite element analysis, the equivalent maximum stress of the device under the applied load (the applied load is greater than the ultimate bearing capacity of the disc cutter) is 206 MPa, and the position is on the C-shaped block. Its material is
42CrMo, so its allowable stress is much greater than 206 MPa; at the same time, the equivalent stress of the inner cutter box is below 80 MPa, so the device is highly reliable in use.
[0034] 2. The technical solution of the device are applied in the expansion of the cutter head is as follows:
[0035] As shown in Fig. 5, a cutter head with a diameter of 10130 mm (a total of 16 muck inlets) is taken as an example to illustrate how the device is applied. #64-#71 is a 19-inch telescopic gage disc cutter boxes are installed on the cutter head. When a normal excavation is executed, #69-#71 cutter box is a reserved cutter box without a disc cutter. As shown in Fig. 7, when the excavation is expanded (radial direction 100mm), the C shaped block of the #58-#63 cutter box is replaced by a C-shaped block for expanding excavation, and then a shim block is installed at the #64-#71 cutter box to extend the inner cutter box. When installing, the inner cutter box can be lifted up by screwing the bolts on the four threaded holes of the outer cutter box, and then installing the shim block, finally, the disc cutter is installed in the reserved cutter box, so that the expansion can be realized by 100 mm (radial direction).
[0036] As shown in Fig. 8, if the required excavation amount is 150 mm (radial direction), the C-shaped of the #64-#71 cutter box are replaced with a C-shaped block for expanding excavation, so as to satisfy the requirements.
[0037] The device can meet the practical work site requirements, and has the advantages of simple structure and high reliability. After the cutter head is used for a certain period of time, the device is subjected to little influence and can be used as usual; and the expansion is suitable for long-distance use. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. which are included in the spirit and scope of the present invention, should be included within the scope of protection of the present invention.
Claims (5)
1. A telescopic gauge disc cutter box, comprising a disc cutter (3), an inner cutter box (1) and an outer cutter box (2), wherein a bolt hole is provided between the inner cutter box (1) and the outer cutter box (2) to enable the inner cutter box (1) and the outer cutter box (2) to be connected by a third bolt (12), characterized in that, further comprising a wedge shaped block (5), a C-shaped block (4) and a tensioning block (6), wherein the wedge shaped block (5) and the C-shaped block (4) are installed in the inner cutter box (1) for fixing a cutter shaft of the disc cutter (3), wherein the tensioning block (6) is installed in a lower part of the outer cutter box (2), wherein the wedge-shaped block (5) is connected to the tensioning block (6) by a first bolt (9), wherein the C-shaped block (4) is connected to the inner cutter box (1) and the outer cutter box (2) by a second bolt (13).
2. The telescopic gauge disc cutter box, as recited in 1, further comprising a shim block (14) disposed between the inner cutter box (1) and the outer cutter box (2), wherein the inner cutter box (1), the shim block (14) and the outer cutter box (2) are connected by the third bolt (12).
3. The telescopic gauge disc cutter box, as recited in 1 or 2, wherein the C-shaped block (5) is selected from at least two C-shaped blocks having different bottom thicknesses.
4. The telescopic gauge disc cutter box, as recited in 1, further comprising a spherical washer I (10) mounted between the tensioning block (6) and the first bolt (9), and a spherical washer 11 (11) mounted between the wedge-shaped block (5) and the first bolt
(9).
5. The telescopic gauge disc cutter box, as recited in 1, wherein the disc cutter (3) is a single-edged cutter.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610828127.1A CN106285707B (en) | 2016-09-18 | 2016-09-18 | A kind of extension type side hobboing cutter girff |
| CN201610828127.1 | 2016-09-18 | ||
| PCT/CN2017/099072 WO2018049974A1 (en) | 2016-09-18 | 2017-08-25 | Telescopic gage disc cutter box |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU2017328222A1 AU2017328222A1 (en) | 2019-05-02 |
| AU2017328222B2 true AU2017328222B2 (en) | 2020-07-09 |
Family
ID=57712370
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2017328222A Active AU2017328222B2 (en) | 2016-09-18 | 2017-08-25 | Telescopic gage disc cutter box |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN106285707B (en) |
| AU (1) | AU2017328222B2 (en) |
| WO (1) | WO2018049974A1 (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106285707B (en) * | 2016-09-18 | 2019-02-22 | 中铁工程装备集团有限公司 | A kind of extension type side hobboing cutter girff |
| CN106640104B (en) * | 2017-01-19 | 2019-09-03 | 徐工集团凯宫重工南京有限公司 | A kind of adjustable falling-proof type hobboing cutter locking device of height |
| US10539017B2 (en) * | 2017-03-10 | 2020-01-21 | The Robbins Company | Cutter housing with field-replaceable seats |
| CN107313782A (en) * | 2017-07-14 | 2017-11-03 | 中国铁建重工集团有限公司 | A kind of hob holder |
| CN109372531A (en) * | 2018-11-28 | 2019-02-22 | 中铁工程装备集团有限公司 | Based on worm and gear can rapid changing knife New Kind of Hob tool apron |
| CN109372537A (en) * | 2018-11-28 | 2019-02-22 | 中铁工程装备集团有限公司 | Based on electrichydraulic control can rapid changing knife New Kind of Hob tool apron |
| CN110529139B (en) * | 2019-09-05 | 2021-08-27 | 中铁工程装备集团有限公司 | Hard rock cutter head and cantilever tunneling machine comprising same |
| CN112709580A (en) * | 2019-10-25 | 2021-04-27 | 爱斯科集团有限责任公司 | Hob housing mounting assembly |
| CN110617076A (en) * | 2019-10-31 | 2019-12-27 | 中铁工程装备集团有限公司 | Swinging push-pull hob cutter system and cutter changing method thereof |
| CN110985022B (en) * | 2019-12-20 | 2021-11-02 | 中国铁建重工集团股份有限公司 | Tool apron device |
| CN111764913B (en) * | 2020-07-03 | 2022-02-25 | 北京市政建设集团有限责任公司 | Shield constructs machine knife dish telescopic machanism |
| CN113930666B (en) * | 2021-09-02 | 2022-09-23 | 中铁工程装备集团有限公司 | Preparation method and application of tool apron material for TBM |
| CN113738391B (en) * | 2021-09-28 | 2024-04-19 | 中铁工程装备集团有限公司 | TBM hob mounting structure and TBM tunneling machine |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202108515U (en) * | 2011-04-27 | 2012-01-11 | 山东天工岩土工程设备有限公司 | Locking mechanism for hob shaft |
| CN104879134A (en) * | 2015-05-21 | 2015-09-02 | 中铁工程装备集团有限公司 | Round cutter box capable of having disc cutter replaced bidirectionally |
| CN205422726U (en) * | 2016-02-02 | 2016-08-03 | 中铁工程装备集团有限公司 | Novel TBM's circular cutter case |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5421422A (en) * | 1993-11-19 | 1995-06-06 | Boretec Inc | Roller cutter mount for tunneling machine |
| JP3396446B2 (en) * | 1999-07-14 | 2003-04-14 | 三菱重工業株式会社 | Tunnel excavator |
| CN202055831U (en) * | 2011-03-24 | 2011-11-30 | 山东天工岩土工程设备有限公司 | Trapezoidal shaft type mounting and locking mechanism for disc cutter |
| CN204984428U (en) * | 2015-09-02 | 2016-01-20 | 昆山众备机械设备有限公司 | Shield constructs quick -witted hobbing cutter mechanism |
| CN105350976B (en) * | 2015-12-14 | 2018-05-04 | 中船重工（青岛）轨道交通装备有限公司 | It is adapted to the rock tunnel(ling) machine cutterhead of complexity hard rock geology |
| CN205297587U (en) * | 2015-12-28 | 2016-06-08 | 中铁工程装备集团有限公司 | TBM combined material hobbing cutter girff |
| CN205298216U (en) * | 2015-12-28 | 2016-06-08 | 中铁工程装备集团有限公司 | TBM hobbing cutter is from locking connecting bolt of locking -type |
| CN206053957U (en) * | 2016-09-18 | 2017-03-29 | 中铁工程装备集团有限公司 | A kind of extension type side hobboing cutter girff |
| CN106285707B (en) * | 2016-09-18 | 2019-02-22 | 中铁工程装备集团有限公司 | A kind of extension type side hobboing cutter girff |
-
2016
- 2016-09-18 CN CN201610828127.1A patent/CN106285707B/en active Active
-
2017
- 2017-08-25 AU AU2017328222A patent/AU2017328222B2/en active Active
- 2017-08-25 WO PCT/CN2017/099072 patent/WO2018049974A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202108515U (en) * | 2011-04-27 | 2012-01-11 | 山东天工岩土工程设备有限公司 | Locking mechanism for hob shaft |
| CN104879134A (en) * | 2015-05-21 | 2015-09-02 | 中铁工程装备集团有限公司 | Round cutter box capable of having disc cutter replaced bidirectionally |
| CN205422726U (en) * | 2016-02-02 | 2016-08-03 | 中铁工程装备集团有限公司 | Novel TBM's circular cutter case |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106285707A (en) | 2017-01-04 |
| AU2017328222A1 (en) | 2019-05-02 |
| CN106285707B (en) | 2019-02-22 |
| WO2018049974A1 (en) | 2018-03-22 |
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| FGA | Letters patent sealed or granted (standard patent) |