Roller cutter support structure

Abstract

To provide a roller cutter supporting structure capable of preventing compaction of sediment in a storage space of a cutter holder.SOLUTION: A roller cutter supporting structure 1 includes a tubular body 12 fixed to a front wall 11 of a cutter frame 10, and a cutter holder 5 disposed inside the tubular body 12. The cutter holder 5 has a cylindrical part and a bottom part forming a storage space 50 opened forward. A roller cutter 2 is inserted into the storage space 50 with a part thereof projecting forward from the front wall 11. In the tubular body 12, a restriction plate 8 is detachably attached to a tip surface of the cylindrical part of the cutter holder 5. The restriction plate 8 covers gaps 55-58 between the cylindrical part and the roller cutter 2.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a roller cutter support structure employed in the cutter head of a tunnel boring machine. [Background technology]

[0002] Some tunnel boring machines are equipped with roller cutters for excavating rock masses on a rotating cutter head. For example, Patent Document 1 discloses a roller cutter support structure that allows the roller cutter to be replaced from inside the cutter frame.

[0003] Specifically, in the roller cutter support structure disclosed in Patent Document 1, a tubular body is fixed to the front wall of a hollow cutter frame, and a cutter holder is disposed within the tubular body. The cutter holder has a cylindrical portion and a bottom portion, which form a storage space that opens forward. A roller cutter is inserted into the storage space. A part of the roller cutter protrudes forward beyond the front wall of the cutter frame. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2016-128650 A Summary of the Invention [Problem to be solved by the invention]

[0005] In a structure in which a roller cutter is inserted into a storage space of a cutter holder as in Patent Document 1, soil and sand may get into the storage space and cause compaction of the soil and sand. When compaction of the soil and sand occurs, the roller cutter cannot rotate and uneven wear occurs on the roller cutter.

[0006] Therefore, an object of the present invention is to provide a roller cutter support structure that can prevent compaction of soil and sand within the storage space of the cutter holder. [Means for solving the problem]

[0007] In order to solve the above problem, the roller cutter support structure of the present invention is characterized in that it comprises a tubular body fixed to the front wall of a cutter frame, a cutter holder arranged within the tubular body and having a cylindrical portion and a bottom which form a storage space which opens forward, a roller cutter inserted into the storage space with a portion of it protruding forward beyond the front wall, and a limiting plate removably attached to the tip surface of the cylindrical portion of the cutter holder within the tubular body, which limiting plate covers the gap between the cylindrical portion and the roller cutter.

[0008] According to the above configuration, the gap between the roller cutter and the cylindrical part is covered by the limiting plate, so that it is possible to suppress the intrusion of soil into the storage space. This makes it possible to prevent compaction of soil in the storage space of the cutter holder. Moreover, since the limiting plate is attached to the tip surface of the cylindrical part, it is possible to prevent wear on the tip surface of the cylindrical part. Furthermore, since the limiting plate is detachable, it is possible to replace the limiting plate when it wears, and it is also possible to replace the roller cutter by removing the limiting plate. Effect of the Invention

[0009] According to the present invention, compaction of soil and sand within the storage space for the cutter holder can be prevented. [Brief description of the drawings]

[0010] [Figure 1] FIG. 2 is a front view of a roller cutter support structure according to an embodiment of the present invention. [Diagram 2] 1 is a front view of the roller cutter support structure with the limiting plate removed. FIG. [Diagram 3] FIG. 2 is a cross-sectional view taken along line III-III in FIG. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. [Diagram 5] FIG. 3 is an enlarged view of a main part of FIG. 2. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] 1 to 4 show a roller cutter support structure 1 according to one embodiment of the present invention. This roller cutter support structure 1 includes a tubular body 12 fixed to a front wall 11 of a hollow cutter frame 10, a cutter holder 5 arranged within the tubular body 12, and a roller cutter 2 held by the cutter holder 5. The front wall 11 faces forward, which is the traveling direction of the tunnel boring machine.

[0012] The roller cutter support structure 1 is configured so that the roller cutter 2 can be replaced from the inside of the cutter frame 10. In this embodiment, the roller cutter 2 is replaced by a rotation type in which the cutter holder 5 is rotated inside the tubular body 12, but the roller cutter 2 may also be replaced by a pull-out type in which the cutter holder 5 is pulled out in the axial direction of the tubular body 12.

[0013] More specifically, in this embodiment, the tubular body 12 is divided into a first member 12a, a second member 12b, and a third member 12c, which are arranged in this order from the front to the rear. The first member 12a is joined to the front wall 11.

[0014] The second member 12b and the third member 12c form a pair of spherical seats facing opposite directions on the same axis. A pair of sleeves 13 are attached to the third member 12c, and these sleeves 13 support a pair of operating members 14, respectively. Each operating member 14 has a spherical portion that is in surface contact with the corresponding spherical seat. Each operating member 14 is also provided with an engagement portion 14a that protrudes radially inward of the tubular body 12.

[0015] 3 and an exchange position (where the cutter holder 5 engages with the engaging portion 14a of the operating member 14) located rearward of the use position. The cutter holder 5 is fixed to the tubular body 12 via a fixing plate 15, thereby being maintained at the use position.

[0016] When replacing the roller cutter 2, the fixed plate 15 is removed and the cutter holder 5 is moved to the replacement position, and then the operating member 14 is operated to rotate the cutter holder 5 180 degrees. This allows the roller cutter 2 to be replaced from inside the cutter frame 10.

[0017] The cutter holder 5 includes a cylindrical portion 52 and a bottom portion 51, and a storage space 50 that opens forward is formed by these cylindrical portion 52 and bottom portion 51. The roller cutter 2 is inserted into the storage space 50 with a portion of the roller cutter 2 protruding forward beyond the front wall 11 in the above-mentioned use position.

[0018] In this embodiment, the roller cutter 2 includes two disc rollers 3 parallel to each other, a central support member 42 located between the disc rollers 3, and a pair of outer support members 41, 43 located outside the disc rollers 3. In other words, one disc roller 3 is interposed between the central support member 42 and the outer support member 41, and the other disc roller 3 is interposed between the central support member 42 and the outer support member 43.

[0019] Each disc roller 3 includes a disc body 31 and an annular blade 32 protruding radially outward from the disc body 31. The thickness of the annular blade 32 is about 1 / 3 of the thickness of the disc body 31, and the annular blade 32 is located at the center of the outer circumferential surface of the disc body 31 in the axial direction of the disc roller 3. In addition, the annular blade 32 tapers radially outward.

[0020] Furthermore, each disc roller 3 includes a pair of shafts 33 protruding on both sides from the disc body 31 along the axial direction of the disc roller 3. The central support member 42 and the outer support member (41 or 43) hold bearings (see FIG. 3) that rotatably support the shafts 33.

[0021] For ease of explanation, hereinafter, the axial direction of the roller cutter 2 (which is also the axial direction of the disc roller 3) will be referred to as the left-right direction, and the direction perpendicular to the left-right direction and the front-rear direction will be referred to as the up-down direction. Each of the central support member 42 and the outer support members 41, 43 is a plate-shaped member that is flat in the left-right direction.

[0022] When the roller cutter 2 is inserted into the storage space 50, the central support member 42 is sandwiched in the vertical direction by the cylindrical portion 52. However, the wedge member 22 is inserted between the front part of the upper end surface of the central support member 42 and the cylindrical portion 52. The wedge member 22 is fixed to the cylindrical portion 52 by a bolt (not shown). The front end surface of the wedge member 22 is located on approximately the same plane as the tip surface of the cylindrical portion 52.

[0023] Similarly, when the roller cutter 2 is inserted into the storage space 50, the outer support members 41, 43 are sandwiched in the vertical direction by the cylindrical portion 52. However, the wedge members 21, 23 are inserted between the front portions of the upper end faces of the outer support members 41, 43 and the cylindrical portion 52. The wedge members 21, 23 are fixed to the cylindrical portion 52 by bolts (not shown). The front end faces of the wedge members 21, 23 are positioned approximately on the same plane as the tip end face of the cylindrical portion 52.

[0024] With this configuration, four gaps 55-58 are formed between the cylindrical portion 52 and the roller cutter 2 around the upper and lower parts of the annular blade 32 of the left disc roller 3 and around the upper and lower parts of the annular blade 32 of the right disc roller 3. These gaps 55-58 are part of the storage space 50.

[0025] When the cutter holder 5 is located at the use position, the tip surface of the cylindrical portion 52 is located slightly rearward of the front end surface of the tubular body 12. An annular limiting plate 8 is detachably attached to the tip surface of the cylindrical portion 52 by a bolt B. A threaded hole 54 into which the bolt B screws is formed in the tip surface of the cylindrical portion 52.

[0026] The front surface of the limiting plate 8 is located on approximately the same plane as the front end surface of the tubular body 12. In other words, the thickness of the limiting plate 8 is approximately equal to the distance from the tip surface of the cylindrical portion 52 to the front end surface of the tubular body 12, and the limiting plate 8 is located inside the tubular body 12. In this embodiment, the limiting plate 8 is divided into an upper piece 81 and a lower piece 82. However, the limiting plate 8 may be a single piece. The limiting plate 8 is preferably made of a wear-resistant material.

[0027] The outer contour of the limiting plate 8 is a circle with a diameter slightly smaller than the inner peripheral surface of the tubular body 12. Therefore, an annular gap 9 is formed between the limiting plate 8 and the tubular body 12. On the other hand, the inner contour of the limiting plate 8 has a shape similar to the contour of the roller cutter 2 on the same plane as the front end surface of the cylindrical portion 52. Therefore, the limiting plate 8 covers the above-mentioned gaps 55 to 58.

[0028] Furthermore, in this embodiment, four first roller cleaning channels 61, two second roller cleaning channels 62, and two external cleaning channels 63 are formed in the cutter holder 5. The first roller cleaning channels 61 and the second roller cleaning channels 62 are channels that extend from the rear surface of the bottom 51 to the storage space 50, and the external cleaning channel is a channel that extends from the rear surface of the bottom 51 to the annular gap 9.

[0029] However, the number of roller cleaning passages and the number of external cleaning passages formed in the cutter holder 5 can be changed as appropriate. For example, the cutter holder 5 may be formed with only one roller cleaning passage or only one external cleaning passage.

[0030] A cleaning liquid is sprayed into the storage space 50 through a first roller cleaning flow path 61 and a second roller cleaning flow path 62, and a cleaning liquid is sprayed into the annular gap 9 through an external cleaning flow path 63. The cleaning liquid sprayed through the first roller cleaning flow path 61 and the second roller cleaning flow path 62 may be the same as or different from the cleaning liquid sprayed through the external cleaning flow path 63. The cleaning liquid is not particularly limited as long as it is not highly viscous, and is, for example, a mud-adding material.

[0031] The fixed plate 15 described above has an opening in its center, and the connecting plate 7 is attached to the rear surface of the bottom of the cutter holder 5 through this opening. The connecting plate 7 is provided with two first couplers 71 for supplying cleaning liquid to the first roller cleaning flow path 61, two second couplers 72 for supplying cleaning liquid to the second roller cleaning flow path 62, and two third couplers 73 for supplying cleaning liquid to the external cleaning flow path 63.

[0032] The bottom 51 of the cutter holder 5 is provided with two recesses 53 to avoid interference with the two annular blades 32. The rear parts of the disc rollers 3 fit into these recesses 53. However, the bottom 51 does not necessarily need to be provided with two recesses 53, and one recess that is wider than the distance between the two annular blades 32 may be provided.

[0033] The two recesses 53 are aligned in the left-right direction, and the bottom surface of each recess 53 is arc-shaped about the rotation center of the roller cutter 2. The first roller cleaning flow path 61 sprays cleaning liquid toward the annular blade 32 within the recesses 53.

[0034] In this embodiment, two first roller cleaning flow paths 61, an upper one and a lower one, are provided for one annular blade 32. The upper first roller cleaning flow path 61 extends obliquely upward toward the front from the rear surface of the bottom part 51 of the cutter holder 5, and the lower first roller cleaning flow path 61 extends obliquely downward toward the front from the rear surface of the bottom part 51 of the cutter holder 5. In addition, the connecting plate 7 is formed with branch paths 74 (see FIG. 4) that connect each first coupler 71 to the two first roller cleaning flow paths 61 lined up on the left and right.

[0035] The two second roller cleaning channels 62 and the two external cleaning channels 63 extend across the bottom 51 and the cylindrical portion 52 of the cutter holder 5. In this embodiment, the cylindrical portion 52 and the bottom 51 of the cutter holder 5 are separate bodies. This makes it possible to easily form the second roller cleaning channels 62 and the external cleaning channels 63.

[0036] More specifically, the bottom portion 51 is a thick plate perpendicular to the front-rear direction, and the rear surface of the cylindrical portion 52 abuts against the front surface of the bottom portion 51. For example, the cylindrical portion 52 and the bottom portion 51 are joined to each other by welding.

[0037] Each second roller cleaning flow passage 62 sprays cleaning liquid from the cylindrical portion 52 toward the two annular blades 32 forward of the rotation center of the roller cutter 2. In this embodiment, each second roller cleaning flow passage 62 sprays cleaning liquid along the limiting plate 8. Although the direction is different, the external cleaning flow passage 63 also sprays cleaning liquid along the limiting plate 8 in a similar manner.

[0038] 5, each second roller cleaning flow path 62 includes a main flow path 62a that extends in the front-rear direction and passes through the cylindrical portion 52, and four inward grooves 62b to 62e that are formed in the tip surface of the cylindrical portion 52 and communicate with the main flow path 62a and the storage space 50. However, the number of inward grooves can be changed as appropriate.

[0039] The inward groove 62b extends from the main flow passage 62a toward the tip of the left annular blade 32, and the inward groove 62c branches off from the inward groove 62b and extends toward the side surface of the left annular blade 32. The inward groove 62d extends from the main flow passage 62a toward the tip of the right annular blade 32, and the inward groove 62e branches off from the inward groove 62d and extends toward the side surface of the right annular blade 32.

[0040] The inward grooves 62b to 62e are covered with the limiting plate 8 to form a part of the second roller washing flow path 62. With this configuration, the second roller washing flow path 62 can be formed by utilizing the limiting plate 8.

[0041] Each external cleaning flow passage 63 includes a main flow passage 63a that extends in the front-rear direction and penetrates the cylindrical portion 52, and three outward grooves 63b to 63d that are formed in the tip surface of the cylindrical portion 52 and communicate with the main flow passage 63a and the annular gap 9 (see FIG. 3). However, the number of outward grooves can be changed as appropriate.

[0042] The outward groove 63b extends leftward from the main flow path 63a to the outer peripheral surface of the tubular portion 52, the outward groove 63c extends rightward from the main flow path 63a to the outer peripheral surface of the tubular portion 52, and the outward groove 63d extends upward from the main flow path 63a to the outer peripheral surface of the tubular portion 52.

[0043] The outward grooves 63b to 63d are covered with the limiting plate 8 to form a part of the external cleaning flow path 63. With this configuration, the external cleaning flow path 63 can be formed by utilizing the limiting plate 8.

[0044] As described above, in the roller cutter support structure 1 of this embodiment, the gaps 55-58 between the roller cutter 2 and the cylindrical portion 52 are covered by the limiting plate 8, so that it is possible to suppress the intrusion of soil into the storage space 50. This makes it possible to prevent compaction of soil in the storage space 50 of the cutter holder 5. Moreover, since the limiting plate 8 is attached to the tip surface of the cylindrical portion 52, it is possible to prevent wear on the tip surface of the cylindrical portion 52. Furthermore, since the limiting plate 8 is detachable, when the limiting plate 8 is worn, the limiting plate 8 can be replaced, and the roller cutter 2 can be replaced by removing the limiting plate 8.

[0045] In addition, in this embodiment, the first roller cleaning flow path 61 and the second roller cleaning flow path 62 that spray cleaning liquid into the storage space 50 are provided, so that the cleaning liquid sprayed into the storage space 50 is sprayed forward at high speed from the small gap between the limiting plate 8 and the roller cutter 2. This further prevents soil from entering the storage space 50. Even if soil does enter the storage space 50, the soil can be washed away by the cleaning liquid.

[0046] Furthermore, the first roller cleaning passage 61 sprays cleaning liquid toward the annular blade 32 of the roller cutter 2 within the recess 53, and the second roller cleaning passage 62 sprays cleaning liquid from the tubular portion 52 toward the annular blade 32 forward of the center of rotation of the roller cutter 2, so that the annular blade 32 can be cleaned at both the front and rear positions within the storage space 50.

[0047] In addition, in this embodiment, since the external cleaning flow passage 63 for spraying cleaning liquid into the annular gap 9 is provided, the inner peripheral surface of the tubular body 12 can be cleaned when replacing the roller cutter 2.

[0048] Furthermore, if the washing liquid is a mud-adding agent, the soil and the mud-adding agent can be mixed at the most ideal position (immediately after excavation).

[0049] (Modification) The present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the gist of the present invention.

[0050] For example, the roller cutter 2 may be formed by integrating two disc rollers 3. In addition, the roller cutter 2 does not necessarily have to have two annular blades 32, and may have only one annular blade 32.

[0051] The cutter holder 5 may not be formed with the external cleaning flow passage 63. Moreover, the cutter holder 5 may be formed with only one of the first roller cleaning flow passage 61 and the second roller cleaning flow passage 62, regardless of whether the external cleaning flow passage 63 is formed or not. Alternatively, the cutter holder 5 may be formed with only the external cleaning flow passage 63, or may not be formed with all of the external cleaning flow passage 63, the first roller cleaning flow passage 61, and the second roller cleaning flow passage 62.

[0052] (summary) The roller cutter support structure of the present invention is characterized in that it comprises a tubular body fixed to the front wall of a cutter frame, a cutter holder arranged within the tubular body and having a cylindrical portion and a bottom which form a storage space which opens forward, a roller cutter inserted into the storage space with a portion of it protruding forward beyond the front wall, and a limiting plate removably attached to the tip surface of the cylindrical portion of the cutter holder within the tubular body, the limiting plate covering the gap between the cylindrical portion and the roller cutter.

[0053] According to the above configuration, the gap between the cutter holder and the cylindrical part is covered by the limiting plate, so that the intrusion of soil into the storage space can be suppressed. This makes it possible to prevent compaction of soil in the storage space of the cutter holder. Moreover, since the limiting plate is attached to the tip surface of the cylindrical part, wear on the tip surface of the cylindrical part can also be prevented. Furthermore, since the limiting plate is detachable, the limiting plate can be replaced when worn, and the roller cutter can be replaced by removing the limiting plate.

[0054] The cutter holder may be formed with at least one roller cleaning flow path extending from the rear surface of the bottom to the storage space, and cleaning liquid may be sprayed into the storage space through the at least one roller cleaning flow path. With this configuration, the cleaning liquid sprayed into the storage space is sprayed forward at high speed from a small gap between the limiting plate and the roller cutter, so that the intrusion of soil into the storage space can be further suppressed. Even if soil does intrude into the storage space, the soil can be washed away by the cleaning liquid.

[0055] The roller cutter may include at least one annular blade tapered radially outward, the bottom of the cutter holder may be provided with at least one recess for avoiding interference with the at least one annular blade, and the at least one roller cleaning flow path may include a first roller cleaning flow path for spraying a cleaning liquid toward the annular blade in the recess, and a second roller cleaning flow path for spraying a cleaning liquid from the tubular portion toward the annular blade forward of the center of rotation of the roller cutter. With this configuration, the annular blade of the roller cutter can be cleaned at both the front and rear positions in the storage space.

[0056] The cutter holder may have a tip end surface formed with an inward groove communicating with the storage space, and the inward groove may be covered with the limiting plate to form a part of the second roller cleaning flow path. With this configuration, the second roller cleaning flow path can be formed by utilizing the limiting plate.

[0057] An annular gap is formed between the limiting plate and the tubular body, and the cutter holder is formed with an external cleaning flow passage extending from the rear surface of the bottom to the annular gap, and a cleaning liquid may be sprayed through the external cleaning flow passage into the annular gap. With this configuration, the inner circumferential surface of the tubular body can be cleaned.

[0058] An outward groove communicating with the annular gap may be formed on the tip surface of the cylindrical portion of the cutter holder, and a part of the external cleaning flow path may be formed by covering the outward groove with the limiting plate. With this configuration, the external cleaning flow path can be formed by utilizing the limiting plate.

[0059] The washing liquid may be a mud-adding agent. With this configuration, the soil and the mud-adding agent can be mixed at the most ideal position (immediately after excavation).

[0060] The cylindrical portion and the bottom portion of the cutter holder may be separate bodies. With this configuration, when one or both of the second roller cleaning flow path and the external cleaning flow path are formed in the cutter holder so as to straddle the bottom portion and the cylindrical portion, the flow path can be easily formed. [Explanation of symbols]

[0061] 1 Roller cutter support structure 10 Cutter Frame 11 Front wall 12 Tubular body 2 Roller cutter 32 Circular blade 5 Cutter holder 50 Storage space 51 Bottom 52 Cylindrical part 53 Recess 55~58 void 61 First roller cleaning channel 62 Second roller cleaning channel 62b~62e Inward groove 63 External cleaning channel 63b~63d Outward groove 8 Restriction Board 9 Annular gap

Claims

1. a tubular body fixed to a front wall of the cutter frame; a cutter holder disposed within the tubular body and having a cylindrical portion and a bottom portion that define a storage space that opens forward; a roller cutter inserted into the storage space with a portion of the roller cutter protruding forward beyond the front wall; a limiting plate that is detachably attached to a tip end surface of the cylindrical portion of the cutter holder within the tubular body and is parallel to a rotation axis of the roller cutter, the limiting plate covering a gap between the cylindrical portion and the roller cutter; A roller cutter support structure comprising:

2. 2. The roller cutter support structure according to claim 1, wherein the cutter holder is formed with at least one roller cleaning flow path extending from a rear surface of the bottom portion to the storage space, and a cleaning liquid is sprayed into the storage space through the at least one roller cleaning flow path.

3. the roller cutter includes at least one annular blade tapering radially outward; The bottom of the cutter holder is provided with at least one recess for avoiding interference with the at least one annular blade; 3. The roller cutter support structure according to claim 2, wherein the at least one roller cleaning passage includes a first roller cleaning passage that sprays cleaning liquid toward the annular blade within the recess, and a second roller cleaning passage that sprays cleaning liquid from the cylindrical portion toward the annular blade forward of a center of rotation of the roller cutter.

4. 4. The roller cutter support structure according to claim 3, wherein an inward groove communicating with the storage space is formed on a tip surface of the cylindrical portion of the cutter holder, and a part of the second roller cleaning flow path is formed by covering this inward groove with the limiting plate.

5. An annular gap is formed between the limiting plate and the tubular body, The roller cutter support structure according to any one of claims 1 to 4, wherein an external cleaning flow path is formed in the cutter holder from the rear surface of the bottom to the annular gap, and cleaning liquid is sprayed into the annular gap through the external cleaning flow path.

6. The roller cutter support structure according to claim 5, wherein an outward groove communicating with the annular gap is formed on the tip surface of the cylindrical portion of the cutter holder, and a part of the external cleaning flow path is formed by covering this outward groove with the restricting plate.

7. The roller cutter support structure according to any one of claims 2 to 6, wherein the cleaning liquid is a muddying agent.

8. The roller cutter support structure according to any one of claims 1 to 7, wherein the cylindrical portion and the bottom portion of the cutter holder are separate bodies.

9. A roller cutter support structure described in any one of claims 1 to 8, wherein the limiting plate has an inner contour similar to the contour of the roller cutter on the same plane as the tip surface of the cylindrical portion of the cutter holder.

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