JP2015025281A - Bit device of shield machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bit device which can be configured in a compact size and is easily applicable without biting sediment.SOLUTION: A bit device of a shield machine includes: a substrate 24 fixed to a cutter head; and a bit body 22 supported on the substrate 24 via a rocking pin 23 in the radial direction of the cutter head. A rock-limiting mechanism 31 capable of making a bit body 22 rock within a prescribed range about the rocking pin 23 as a center is provided between a pin hole 30 formed in the bit body 22 and the rocking pin 23. A pin connection part consisting of the rock-limiting mechanism 31, the rocking pin 23, a boss hole 24C, and the pin hole 30 is made as a sealed structure.

Description

  The present invention relates to a rocking bit device provided in a cutter head of a shield machine.

  In the shield machine, a cutter head is rotatably supported at the front of the shield machine, and a plurality of excavation bits are provided on the front surface of the cutter head to prevent rolling of the shield machine. Digging while switching the rotation direction of the cutter head.

  In the excavation bit, in order to cope with the switching of the rotation direction of the cutter head, a cutting edge portion made of a hard material is embedded on each side of the rotation direction. In this case, the natural ground is excavated at the cutting edge in front of the rotation direction, but earth and sand contact the surrounding base material and wear due to friction on the cutting edge side in the rotation direction, so the life of the excavation bit is shortened. There was a problem of becoming.

  As a countermeasure, Patent Document 1 is provided with a drilling body swingable through a radial pin before and after the drilling direction of a column body fixed to a cutter pork. Further, Patent Document 2 is configured such that a cutter pork is composed of a rod portion provided along the length direction and a cover portion provided on the rod portion so as to be rotatable within a predetermined range, and a bit is attached to the cover portion. Forward and reverse bits are provided through a table. Further, in Patent Document 3, an arc-shaped guide surface centered on the longitudinal axis is formed on the front surface of the cutter spoke, and a spoke movable member that is slidable in the circumferential direction along the guide surface is linked. A cutter bit is provided through a mechanism, and cutter bits are provided before and after the sliding direction of the spoke movable member.

JP 2001-98890 (FIG. 4) Japanese Patent No. 3885333 (FIG. 3) Japanese Patent No. 2980309 (FIG. 6)

  However, in Patent Document 1, there is a problem that the excavation body does not oscillate because the gap between the pillar body and the excavation body changes due to the rocking of the excavation body and the earth and sand enter the gap so that the earth and sand get caught. .

  Further, Patent Documents 2 and 3 have a large structure that swings the entire cutter pork within a predetermined range. When applied, there is a problem that the cutter head structure itself cannot be easily applied because it affects the cutter head structure itself.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a bit device for a shield machine that can solve the above-described problems and can be configured in a small size without being caught in earth and sand.

The invention described in claim 1
A swinging bit device mounted on a cutter head rotatably supported at the front of a shield machine,
A support body fixed to the cutter head, and a bit body supported by the support body via a rocking pin in the radial direction of the cutter head,
Swing limit that allows rocking of the bit body within a predetermined range around the rocking pin between one of the pin hole formed in the bit body and the boss hole formed in the support and the rocking pin Provided a mechanism,
The pin coupling part consisting of the swing limit mechanism, swing pin, boss hole and pin hole has a sealed structure,
A drilling tip is provided on at least one of the swing directions on the front surface of the bit body.

The invention according to claim 2 is the configuration according to claim 1,
A convex arc surface centering on the oscillation axis of the oscillation pin is formed in the front portion of the support body, and a rocking shaft is provided on the back surface of the bit body with a certain gap in the convex arc surface. Forming a concave arc surface centered on the heart,
The gap between the convex arc surface and the concave arc surface is not changed by the swinging of the bit body.

The invention according to claim 3 is the configuration according to claim 1 or 2,
The swing limiting mechanism includes a swinging pin and a fan-shaped locking recess formed in a sliding portion that is slidably contacted with each other, and a swinging pin and a hole in which the swinging pin is fitted. A locking tooth portion that is formed on the other of the pin and the hole portion and is fitted to the locking recess so as to be freely rotatable within a predetermined swing angle range;
The hole portion is one of a pin hole and a boss hole, and a swing shaft is fitted and fixed to the other of the pin hole and the boss hole.

The invention according to claim 4 is the configuration according to claim 1 or 2,
The swing limit mechanism forms a polygonal cross-section prism on at least a part of the swing pin,
A restriction surface is formed on a plurality of surfaces facing each other at the prism portion, and a regulated surface is formed on the inner surface of the hole portion facing the restriction surface to restrict the swinging of the prism portion and the hole portion within a predetermined range. And
Forming a swing allowable space between the regulating surface and the regulated surface;
The hole portion is one of a pin hole and a boss hole, and a swing shaft is fitted and fixed to the other of the pin hole and the boss hole.

The invention according to claim 5 is the configuration according to any one of claims 1 to 4,
A lubricant is enclosed in a pin coupling portion.
The invention according to claim 6 is the configuration according to claim 5,
A pressure mechanism that pressurizes the lubricant is provided at the pin coupling portion.

The invention according to claim 7 is the configuration according to claim 6,
The pressure mechanism is
A cylinder hole formed in the swing pin along the swing axis direction;
A piston slidably inserted into the cylinder hole;
An elastic member and / or high-pressure gas for driving the piston in the cylinder hole is provided.

  According to the first aspect of the present invention, the support body and the bit body are provided by providing the swing limiting mechanism between the swing pin and the pin hole or between the swing pin and the boss hole, and forming the pin coupling portion in a sealed structure. There is no biting of earth and sand between them, and it can be made compact and can be installed at an arbitrary position of the cutter head.

  According to the second aspect of the present invention, since the gap between the convex arc surface of the support and the concave arc surface of the bit body is constant, the gap does not change due to the swinging of the bit body, and the soil bites. Thus, the swinging of the bit body is not hindered.

  According to the third aspect of the present invention, by forming the locking concave portion and the locking tooth portion in the swing pin and the pin hole, or the swing pin and the boss hole, the bit main body is mounted in the pin coupling portion of the sealed structure. While supporting with sufficient strength, it is possible to regulate with sufficient strength at the swing limit.

  According to the fourth aspect of the present invention, the prismatic portion having the restriction surface is formed on the swing pin, and the regulated surface that restricts the swing of the prismatic portion within a predetermined range is formed on the pin hole or the boss hole. In addition, the bit body can be supported with sufficient strength within the pin coupling portion having a sealed structure, and can be regulated with sufficient strength at the swing limit.

  According to the invention described in claim 5, by encapsulating a lubricant in the pin coupling portion, the lubrication of the pin coupling portion can be promoted to prevent the occurrence of wear or rust and the like, and the sealing material. Lubrication and deterioration protection can be performed, and the water stoppage of the pin coupling portion can be increased.

  According to the invention described in claim 6, by pressurizing the lubricant by the pressurizing mechanism, the water resistance of the pin coupling portion against the increase in earth pressure, water pressure, or excavation pressure of the face is increased, and the lubricity of the sealing material is increased. be able to.

  According to the seventh aspect of the present invention, the lubricant is pressurized with a simple structure by driving the cylinder hole formed in the swing pin and the piston inserted into the cylinder hole with an elastic member or high-pressure gas. Can do.

It is a side view which shows Example 1 of the bit apparatus of the shield machine based on this invention. It is a longitudinal cross-sectional view of a bit apparatus. It is AA sectional drawing shown in FIG. It is BB sectional drawing shown in FIG. It is a disassembled perspective view of a bit apparatus. (A)-(c) is an enlarged cross-sectional view of a rocking pin and pin hole showing a rocking restriction mechanism, (a) is the embodiment, (b) is a first modification, and (c) is a second modification. It is an example. It is a front view which shows the cutter head of a shield machine. It is CC sectional drawing shown in FIG. (A)-(d) is an enlarged cross-sectional view of a swing pin and a pin hole showing a modification of the swing limiting mechanism, (a) is a third modification, (b) is a fourth modification, (c) Is a fifth modification, and (d) is a sixth modification. It is an enlarged cross-sectional view of a rocking pin and a pin hole showing a seventh modification of the rocking limiting mechanism. It is a longitudinal cross-sectional view which shows the other pressurization mechanism of the lubricant of the bit apparatus which concerns on this invention. FIG. 6 is a cross-sectional view of a cut-out spoke showing a second embodiment of the bit device of the shield machine according to the present invention and showing a use state. It is Example 3 of the bit apparatus of the shield machine which concerns on this invention, and is a cross-sectional view of the cutter pork which shows a use condition.

[Example 1]
Embodiment 1 of the present invention and modifications thereof will be described below with reference to FIGS.
(Overall structure)
As shown in FIG. 7, a cutter head 11 that is rotatably supported around the shield axis O at the front portion of a shield body (not shown) has a plurality of main cutters at equal angles from the center member 12. Spokes 13 extend in the radial direction. These main cutter spokes 13 are connected and supported by an intermediate ring 14 and an outer ring 15, and between the main cutter porks 13, a secondary cutter pork (cut pork) 16 is arranged in the radial direction between the intermediate ring 14 and the outer ring 15. Is installed. A soil intake port 17 is formed between the main cutter pork 13, the intermediate ring 14, the outer peripheral ring 15, and the auxiliary cutter pork 16.

  A center bit 18 is attached to the center member 12, and fixed cutter bits 19 are attached to the front surface and both edges of the main cutter pork 13 at a predetermined pitch in the radial direction. Further, as shown in FIG. 8, fixed cutter bits 19 are attached to both edges of the sub cutter spoke 16 at a predetermined pitch in the radial direction. Further, the swinging bit device 21 according to the present invention is attached at a predetermined pitch at a predetermined position of the outer peripheral ring 15 and a front center portion of the auxiliary cutter spoke 16.

(Bit device)
As shown in FIGS. 1 to 5, the bit device 21 includes a support body 24 attached to the auxiliary cutter pork 16 or the outer peripheral ring 15, and a bit body 22 via a swing pin 23 in the radial direction. The swinging type is supported so as to be swingable around a center Or in a range of a predetermined swinging angle γ.

  The support 24 includes a base portion 24A attached to the sub-cut spokes 16 or the outer ring 15 by mounting bolts 25 attached to the plurality of mounting holes 24a, and a predetermined interval in the radial direction between the base portion 24A. And a pair of inner and outer boss portions 24B each having a boss hole 24C formed on the swing axis Or.

  The bit body 22 is inserted between the boss portions 24B, and the shaft support portion 22A in which the pin hole 30 into which the swing pin 23 is fitted is formed, and the protruding portion 22C is extended from the front portion of the shaft support portion 22A. The excavation block 22B that is provided and covers the front of the boss portion 24B is formed in a T shape. Further, hard excavation tips 26 are provided on the front surface of the excavation block 22B at both ends in the swing direction centered on the swing axis Or (both ends in the tangential direction centered on the shield axis O shown in FIG. 7). It is embedded over the entire width, and a hard wear prevention tip 27 is embedded in each of the excavation tips 26 on the swing axis Or side. The front surface of the boss portion 24B is formed on a convex arcuate surface 28A centered on the oscillation axis Or, and a fixed gap δ is formed facing the convex arcuate surface 28A, and the center of the oscillation axis Or A concave arcuate surface 28B is formed on the back surface of the overhanging portion 22C of the excavation block 22B.

  In the above configuration, the projecting portion 22C that covers the front surface of the inner and outer boss portions 24B covers the sliding portion between the boss portion 24B and the shaft support portion 22A, thereby preventing soil and sand from being caught in the sliding portion. In addition, the gap δ formed between the convex arc surface 28A and the concave arc surface 28B does not change even when the bit body 22 swings. Therefore, even if earth or sand may enter the gap δ, the bit body is caused by the earth and sand. The swing of 22 is not restricted. Further, since the gap δ is not expanded or contracted due to the swinging of the bit body 22, it is possible to suppress the intrusion of earth and sand into the gap δ.

(Swing limit mechanism)
Between the pin hole 30 and the swing pin 23 of the bit body 22, a swing limit mechanism 31 that restricts the swing angle γ of the bit body 22 is provided.

  This rocking | fluctuation limiting mechanism 31 is the rocking | fluctuation permission space part which accept | permits rocking | fluctuation of the rocking | fluctuation pin 23 in the range of rocking | fluctuation angle (gamma) between the rocking | fluctuation pin 23 and the pin hole 30 formed in shaft support part 22A. 31a is formed. The swing pin 23 is formed in a prismatic portion having an octagonal (polygonal) cross section over the entire length. The boss hole 24C of the boss portion 24B is formed in an octagonal cross section that is substantially the same (slightly larger) as the prism portion, and the swing pin 23 is closely fitted to prevent the swing pin 23 from rotating. It constitutes a pin fixing means for (fixing). Of course, the pin fixing means can also be configured by providing both ends of the swing pin 23 and the boss hole 24C in a circular cross section and providing a key groove and a key.

Here, the “polygon” means a figure in which a plurality of corner portions are located on the same circumference, and it does not matter whether the surface is a flat surface or a curved surface.
That is, as shown in FIG. 6 (a), the rocking limit mechanism 31 has a rocking pin 23 with a curved surface centered on the rocking axis Or on the short side and the regulating surface 23L having a flat surface on the long side. The guide surfaces 23S are formed in an octagonal cross section formed alternately. The guide surface 23S is formed in the range of the sliding contact angle α. On the other hand, the pin hole 30 is formed in an octagonal cross section in which a long-side regulated surface 30L and a curved guided surface 30S centering on the oscillation axis Or at the short side are alternately formed. The surface 30S is formed in an angle range wider than the guide surface 23S of the swing pin 23 by the swing angle γ. And both ends of these guided surfaces 30S serve as swing regulation ends. The regulated surface 30L is formed in a shallow V-shaped cross section including a top portion whose central portion approaches the swing axis Or side, and an inclined flat surface spaced from the swing shaft Or on both sides from the top portion. Therefore, the swing pin 23 swung to the swing restriction end is restricted from swinging when one of the inclined flat surfaces of the restriction surface 23L and the restricted surface 30L is in surface contact. The space between the regulated surface 30L and the regulating surface 23L becomes the swing allowable space 31a.

(First variation of swing limit mechanism)
Next, the rocking | fluctuation limiting mechanism 31A of a 1st modification is demonstrated with reference to FIG.6 (b). The same members as those in the above embodiment are denoted by the same reference numerals and description thereof is omitted. In the first modification, a swing allowable space 31a is provided on the swing pin 23 side.

  That is, the regulated surface 30L of the pin hole 30 is a flat surface, and the regulating surface 23L of the swing pin 23 is inclined flat so that the central top is close to the regulated surface 30L and the top approaches the swing axis Or. It is formed in a low chevron cross section. Therefore, when the swing pin 23 is swung to the swing restriction end, the inclined flat surface of the restricting surface 23L comes into surface contact with the restricted surface 30L and the swing is restricted.

According to the first modification, the cutting process for forming the swing allowable space portion 31 a is only the swing pin 23, and the manufacture is easier than the cutting process of the pin hole 30.
(Second modification of the swing limiting mechanism)
Furthermore, the rocking | fluctuation limiting mechanism 31B of a 2nd modification is demonstrated with reference to FIG.6 (c). The same members as those in the above embodiment are denoted by the same reference numerals and description thereof is omitted. In the second modified example, swing allowable space portions 31a are provided on the pin hole 30 side and the swing pin 23 side, respectively.

  That is, the regulated surface 30L of the pin hole 30 has a V-shaped cross section, and the regulating surface 23L of the swing pin 23 is formed in a low chevron cross section that is symmetrical to the regulated surface 30L. Thus, when the bit body 22 is swung to the swing restriction end, the restricting surface 23L of the swing pin 23 comes into surface contact with the regulated surface 30L of the pin hole 30 to restrict the swing. is there.

According to the second modification, a wide swing angle γ can be secured with sufficient strength.
(Third to seventh modifications of the swing limiting mechanism)
In the rocking restriction mechanisms 31, 31A, 31B, the octagonal (polygonal) cross section of the rocking pin 23 and the pin hole 30 are formed. However, in the third to fifth modifications, a rectangular (polygonal) cross section over the entire length. The swing limiting mechanism 31C to 31E is formed with a swing pin 51 formed in the rectangular column portion and a pin hole 52 having a substantially square cross section into which the swing pin 23 is fitted in the shaft support portion 22A. The same members as those in the above embodiment are denoted by the same reference numerals and description thereof is omitted.

(Third Modification)
That is, as shown in FIG. 9A, the swing limiting mechanism 31C has an arcuate cross section with the swing pin 51 having a long side and a flat regulating surface 51L and a short side centered on the swing axis Or. The guide surfaces 51 </ b> S are formed in a square cross section facing each other. And the guide surface 51S is formed in the range of the sliding contact angle α. On the other hand, the pin hole 52 has a rectangular cross section in which a long-side regulated surface 52L and a short-side guided surface 52S having an arc-shaped cross section centered on the oscillation axis Or are opposed to each other. The guided surface 52S is formed in an angle range wider than the guide surface 51S of the swing pin 23 by the swing angle γ, and both ends of the guided surface 52S serve as swing restriction ends. The regulated surface 52L is formed in a shallow V-shaped cross section having a top portion whose central portion approaches the swing axis Or side, and an inclined flat surface that is spaced from the swing axis Or on both sides from the top portion. Then, the swinging pin 23 swinging to the swing restricting end is controlled to swing while its restricting surface 51L comes into surface contact with the inclined flat surface of the restricted surface 52L. A space portion between the regulated surface 52L and the regulating surface 51L is a swing allowable space portion 31a.

(Fourth and fifth modifications)
FIG. 9B shows a swing restriction mechanism 31D of the fourth modification, and FIG. 9C shows a swing restriction mechanism 31E of the fifth modification. Structurally, it is the same as the first modification and the second modification, and the same members as those in the third modification are denoted by the same reference numerals and the description thereof is omitted.

In the fourth modified example, the rocking allowance space 31a is provided with the regulated surface 52L of the pin hole 52 as a flat surface and the regulating surface 51L of the rocking pin 51 as a low chevron cross section.
In the fifth modified example, a swing allowable space portion 31a is provided with the regulated surface 52L of the pin hole 52 and the regulating surface 51L of the swing pin 51 as a shallow V-shaped cross section and a low chevron cross section.

(Sixth Modification)
FIG. 9D shows a sixth modification of the swing limiting mechanism, in which the swing pin 55 and the pin hole 56 do not have arcuate guide surfaces and guided surfaces that are in sliding contact with each other. The same members as those in the first modification and the second modification are denoted by the same reference numerals and description thereof is omitted.

  In the swing limiting mechanism 31F of the sixth modified example, the pin hole 56 is formed in a rectangular cross section, the regulated surface 56L in which the long sides facing each other are formed on a flat surface, and the short sides facing each other are flat. It is comprised with the rotation surface 56S formed in the surface. The four corners of the pin hole 56 may be formed in an arc shape. On the other hand, the oscillating pin 55 is formed in a substantially rectangular cross section, and the long sides facing each other are formed in a shallow, substantially parabolic, regulated surface 55L that is symmetrical about the longitudinal axis Ov passing through the oscillating axis Or. Short sides facing each other are formed on a substantially parabolic pivot surface 55S that is vertically symmetric with respect to a horizontal axis Oh that passes through the swing axis Or.

According to the rocking restriction mechanisms 31C to 31F of the third to sixth modifications, it is possible to achieve the same effects as the rocking restriction mechanisms 31, 31A, 31B.
(Seventh Modification)
A swing limiting mechanism 31G of the seventh modification will be described with reference to FIG.

  That is, the swing pin 53 has a predetermined range (sliding contact angle α +) at an outer peripheral portion at an arcuate sliding portion 53R centering on the swing axis Or and a single position or a plurality of symmetrical positions of the sliding portion 53R. Fan-shaped locking recesses (locking portions) 53S formed at the swing angle γ), and are formed in the same cross-sectional shape over the entire length. The boss hole 24C is formed and fitted in a cross-sectional shape substantially the same (slightly larger similar shape) as the swing pin 53, and pin fixing means for fixing the swing pin 53 to the boss portion 24B is configured. Of course, it is also possible to form a pin fixing means comprising a key groove and a key by making both ends of the swing pin 53 and the boss hole 54 have a circular cross section.

  On the other hand, the pin hole 54 is slidably contacted with the sliding portion 53R, and protrudes from the guiding portion 54R and is fitted to the locking recess 53S so as to be freely rotatable within a range of the swing angle γ. The guide body 54R and the locking tooth portion 54G allow the bit body 22 having the pin hole 54 to swing to the swing pin 53 within the swing angle γ. Supported. Further, here, the outer peripheral portion of the locking tooth portion 54G is brought into sliding contact with the bottom portion of the locking concave portion 53S to guide the swing of the pin hole 54.

  According to the rocking restriction mechanism 31G, the rocking pin 53 and the pin hole 54 are formed with the locking concave portion 53S and the locking tooth portion 54G, so that the bit body 22 can be moved within the pin coupling portion having a sealed structure. The swing can be controlled and supported with sufficient strength at the swing limit.

Note that a locking recess may be formed in the pin hole 54, and a locking tooth portion may be formed in the swing shaft 53.
Further, in place of the above structure, a spline shaft / spline hole meshing structure may be used as long as the swing angle γ can be secured with a wide range of gear play.

(Another embodiment of the swing limiting mechanism)
The rocking restriction mechanisms 31, 31A to 31G are provided in the fitting portion between the rocking shaft 23 and the pin hole 30, but the pin hole 30 and the rocking shaft are prevented from rotating by the pin fixing means described above, The swing restriction mechanisms 31, 31A to 31G may be provided in the fitting portions of the swing shaft 23 and one or both boss holes 24C.

  In addition, in the rocking | fluctuation limitation mechanisms 31, 31A-31G, although the prismatic part, the latching recessed part 53S, and the latching tooth part (locking part) 54G were formed over the full length of the rocking pins 23,51,53, at least rocking What is necessary is just to form corresponding to the structure part of the movement limitation mechanisms 31 and 31A-31G, and it can fix to the boss hole 24C or the pin hole 30 with a key etc. by making a remainder into a column shape.

(Sealing structure and pressure mechanism)
The bit device 21 includes a swing pin 23 including a swing restriction mechanism 31, a pin hole 30, and a boss hole 24 </ b> C, and a pin coupling portion that connects the support body 24 to the bit body 22 via the swing pin 23 is hermetically sealed. It is said. Then, lubricating oil (lubricant) G such as grease is sealed in the pin coupling portion. Further, a pressurizing mechanism 46 that pressurizes the lubricating oil G sealed in the pin coupling portion is provided.

  That is, the opening parts 32 and 32 for closure are formed in the boss | hub part 24B of the support body 24 in the outer end part of the boss | hub hole 24C, respectively. Then, the closing plates 33R and 33L are attached to the closing openings 32 and 32 through screw portions, and the boss holes 24C are closed by the closing plates 33R and 33L. A cylinder hole 36 is formed in the axial center portion of the swing pin 23 along the swing axis Or. A pressurizing piston 37 is slidably fitted into the cylinder hole 36 to pressurize the lubricating oil G. A mechanism 46 is configured. Reference numeral 37 a denotes a restricting ring that is a movement limit of the piston 37. Further, four communication grooves 38 extending from the end of the cylinder hole 36 to the four guide surfaces 23S are formed in the radial direction of the swing pin 23 at the right end of the swing pin 23 on the one closing plate 33R side. Yes. A lubricating groove 39 for accommodating the lubricating oil G is formed in each guide surface 23 </ b> S along the direction of the swing axis Or, and the cylinder hole 36 and each communication groove 38 are connected via the lubricating groove 39.

  As shown in FIG. 3, through holes 24b penetrating the boss holes 24C are formed on the side surface of the boss portion 24B on the other closing plate 33L side, and the air vent plugs 40 are respectively attached to the through holes 24b. . In addition, a communication groove 41 that connects the lubricating groove 39 to the through hole 24b is formed in the circumferential direction.

  A lubricant injection plug 34 for injecting the lubricating oil G is mounted in a hole formed on one closing plate 33R so as to face the cylinder hole 36. An air check valve 35 (pressurizing mechanism) capable of injecting pressurized air is mounted in a hole formed in the other closing plate 33 </ b> R so as to face the cylinder hole 36.

  Further, circular groove portions surrounding the boss hole 24C are formed on the end surfaces of the opening portions 32, 32 for closing by the boss portion 24B, and shaft seal materials 42 pressed against the closing plates 33R, 33L are interposed in both groove portions. ing. The other closing plate 33L is formed with a circular groove that surrounds the hole so as to face the end surface of the swing shaft 23, and a shaft end seal member 44 is interposed in the groove. Further, circular grooves are formed around the boss holes 24C on the opposing surfaces of the both boss portions 24B, and a swinging portion seal material 43 pressed against the shaft support portion 22A is interposed in these groove portions.

  Therefore, both end portions of the swing pin 23 are sealed with the left and right closing plates 33R and 33L, the shaft portion seal material 42, and the shaft end seal material 44, and the boss portion 24B and the shaft support portion 22A are formed by the swing portion seal material 43. The pin coupling part has a sealed structure. With this sealed structure, it is possible to prevent infiltration of earth and sand and muddy water into the pin coupling portion.

  Further, the air check valve 35 and the air vent plug 40 are opened, and the lubricating oil G is injected from the lubricant injection plug 34, and the cylinder hole is inserted into one side of the piston 37 of the cylinder hole 36 or through the lubricating groove 39. 36 and each communication groove 38 are filled with lubricating oil G, the air check valve 35 and the air vent plug 40 are closed, and the lubricating oil G is sealed in the pin coupling portion, so that intrusion of earth and sand and mud water is effective. Can be prevented.

  Furthermore, by injecting high pressure air (high pressure gas) from the air check valve 35 to the other side of the cylinder hole 36, the piston 37 can be driven to compress the lubricating oil. As a result, even if the lubricating oil leaks, the pin coupling portion can be held at a hydraulic pressure higher than a predetermined value, and intrusion of earth and sand or muddy water can be prevented more effectively.

(Other pressure mechanisms)
In FIG. 11, the bit device 21 is provided with another pressurizing mechanism. The same members as those in the above embodiment are denoted by the same reference numerals and description thereof is omitted.

A coil spring 45, which is an elastic member, is inserted in the other side (high-pressure air injection side) in the cylinder hole 36 in place of the high-pressure air, and the same effects as high-pressure air can be achieved.
As another modification of the pressurizing mechanism, high pressure air is supplied into the cylinder hole 36 in which the coil spring 45 is inserted and used together with the spring force, so that the oil pressure of the lubricating oil can be maintained evenly for a long time. It is possible to more effectively prevent the sand and muddy water from entering the pin coupling portion.

(Effect of Example 1)
According to the first embodiment, by providing the swing restricting mechanisms 31, 31A to 31F between the swing pin 23 and the pin hole 30 or the boss hole 24C, and the pin coupling portion having a sealed structure, the support body There is no biting of earth and sand into the sliding part of 24 and the bit main body 22, and it can be configured in a small size, and the application becomes easy.

  In addition, since the overhanging portion 22C that covers the front surface of the boss portion 24B is formed in the excavation block 22B and the sliding portion between the boss portion 24B and the shaft support portion 22A is covered, earth and sand directly enters the sliding portion from the excavation portion. This prevents soil and sand from being bitten. In addition, the gap δ formed between the convex arc surface 28A and the concave arc surface 28B does not change even when the bit body 22 swings. Therefore, even if earth or sand may enter the gap δ, the bit body is caused by the earth and sand. The swing of 22 is not hindered. Moreover, invasion of earth and sand can be suppressed as compared with expansion and contraction of the gap.

  Further, since the swing pin 23 has a polygonal column cross section having a guide surface 23S and a restricting surface 23L, and the regulated surface 30L for restricting the swing within a predetermined range is formed in the pin hole 30, the pin coupling of the sealed structure In the section, the swing of the bit body 22 can be regulated with sufficient strength at the swing limit.

  Furthermore, by encapsulating the lubricating oil G in the pin coupling portion, the lubrication of the rocking pin 23 and the pin hole 30 in the pin coupling portion can be improved, and the sticking due to rust can be prevented in advance, and the shaft portion sealing material 42, the rocking portion seal material 43, and the shaft end portion seal material 44 can be lubricated and protected against deterioration, and the water stoppage to the pin coupling portion can be increased.

  Further, by pressurizing the lubricating oil G by the pressurizing mechanism 46, the water stoppage against the increase in earth pressure, water pressure and excavation pressure of the face is increased, and the shaft portion sealing material 42, the swinging portion sealing material 43, the shaft end seal. The lubricity of the material 44 can be improved.

  Further, by driving the cylinder hole 36 formed in the axial center portion of the swing pin 23 and the piston 37 inserted into the cylinder hole 36 with a coil spring 45 or high-pressure air, the lubricating oil G can be added with a simple structure. It is possible to pressurize, and it is possible to further increase the water stoppage to the pin coupling portion.

[Example 2]
In the first embodiment, the excavation tip 26 is embedded at both ends in the swing direction on the front surface of the excavation block 22B, and one bit device 21 excavates when the cutter head 11 is rotating forward and reverse. As shown in FIG. 12, two bit devices 21A and 21B are arranged as a pair in the tangential direction of the cutter head 11, and excavated by another bit device 21A and 21B during forward rotation and reverse rotation. It is comprised so that it may do.

  In the second embodiment, the pin coupling portion, the swing limiting mechanisms 31, 31A to 31F, the sealing structure, and the pressurizing mechanism are configured in the same manner as in the first embodiment, but one piece is provided on the front surface of the excavation block 22B. The excavation tip 26 and the wear prevention tip 27 are embedded in relative positions so as to be positioned in front of the secondary cutter pork 16 in the forward / reverse direction. When the secondary cutter spoke 16 rotates forward in the direction of arrow C, as shown by the solid line, the bit body 22 of the front bit device 21A in the forward rotation direction C rotates counterclockwise on FIG. The excavation tip 26 is moved forward to project forward, and the rear bit device 21B is rotated counterclockwise in FIG. 12 to retract the excavation tip 26. When the secondary cutter pork 16 moves in the reverse direction in the direction of arrow D, the bit body 22 of the bit device 21B rotates clockwise in FIG. The rear bit device 21A is rotated clockwise in FIG. 12, and the excavation tip 26 is retracted.

  According to the second embodiment, the excavation in the normal rotation direction and the reverse rotation direction are separately assigned to the two bit devices 21A and 21B, thereby reducing wear and load on the bit devices 21A and 21B and extending the excavation distance. Can extend the service life.

[Example 3]
In the third embodiment of FIG. 13, the bit device 21 of the first embodiment is installed in the front center portion of the auxiliary cutter pork 16, and the excavation tip 26 is embedded on both sides of the auxiliary cutter pork 16 only on one side (front). The bit devices 21C and 21D are installed.

  In the bit devices 21C and 21D, one length of the excavation block 22B is increased and the excavation tip 26 is embedded in the tip portion thereof. When the secondary cutter spoke 16 rotates forward in the direction of arrow E, the bit bodies 22 of the bit devices 21, 21C, and 21D are rotated counterclockwise on FIG. The excavation tip 26 of the rear bit device 21D is retracted. When the secondary cutter pork 16 is moved in the reverse direction in the direction of arrow E, the bit bodies 22 of the bit devices 21, 21C, 21D are respectively rotated clockwise in FIG. The excavation tip 26 of the bit device 21D is projected forward, and the excavation tip 26 of the rear bit device 21C is retracted.

  According to the second embodiment, by allowing the three bit devices 21, 21C, 21D to separately handle the forward and reverse excavations, wear and load are reduced, the excavation distance can be extended, and the service life can be extended. Can be extended.

O Shield axis Or Or oscillating axis γ oscillating angle δ Clearance G Lubricating oil (lubricant)
11 Cutter head 13 Main cutter spoke 16 Sub cutter spoke 19 Cutter bits 21, 21A to 21D Bit device 22 Bit body 22A Shaft support 22B Excavation block 22C Overhang portion 23 Swing pin 23L Restriction surface 23S Guide surface 24 Support 24A Base Portion 24B boss portion 24C boss hole 26 excavation tip 28A convex arc surface 28B concave arc surface 30 pin hole 30L regulated surface 30S guided surface 31 swing limit mechanism 31A to 31F swing limit mechanism 31a swing allowable space 33R, 33L Closure plate 34 Lubricant injection plug 35 Air check valve 36 Cylinder hole 37 Piston 38 Communication groove 39 Lubrication groove 40 Air vent plug 41 Connecting groove 42 Shaft seal material 43 Sliding portion seal material 44 Shaft end seal material 45 Coil spring 46 Pressurization mechanism

Claims (7)

A swinging bit device mounted on a cutter head rotatably supported at the front of a shield machine,
A support body fixed to the cutter head, and a bit body supported by the support body via a rocking pin in the radial direction of the cutter head,
Swing limit that allows rocking of the bit body within a predetermined range around the rocking pin between one of the pin hole formed in the bit body and the boss hole formed in the support and the rocking pin Provided a mechanism,
The pin coupling part consisting of the swing limit mechanism, swing pin, boss hole and pin hole has a sealed structure,
A bit device of a shield machine, wherein a drilling tip is provided on at least one of the swing directions on the front surface of the bit body. A convex arc surface centering on the oscillation axis of the oscillation pin is formed in the front portion of the support body, and a rocking shaft is provided on the back surface of the bit body with a certain gap in the convex arc surface. Forming a concave arc surface centered on the heart,
The bit device of the shield machine according to claim 1, wherein a gap between the convex arc surface and the concave arc surface is not changed by swinging of the bit body. The swing limiting mechanism includes a swinging pin and a fan-shaped locking recess formed in a sliding portion that is slidably contacted with each other, and a swinging pin and a hole in which the swinging pin is fitted. A locking tooth portion that is formed on the other of the pin and the hole portion and is fitted to the locking recess so as to be freely rotatable within a predetermined swing angle range;
The bit device of a shield machine according to claim 1 or 2, wherein the hole portion is one of a pin hole and a boss hole, and a swing shaft is fitted and fixed to the other of the pin hole and the boss hole. . The swing limit mechanism forms a polygonal cross-section prism on at least a part of the swing pin,
A restriction surface is formed on a plurality of surfaces facing each other at the prism portion, and a regulated surface is provided on the inner surface of the hole portion facing the restriction surface to restrict the swinging of the prism portion and the hole portion within a predetermined range. Forming,
Forming a swing allowable space between the regulating surface and the regulated surface;
The bit device of a shield machine according to claim 1 or 2, wherein the hole portion is one of a pin hole and a boss hole, and a swing shaft is fitted and fixed to the other of the pin hole and the boss hole. . The bit device of the shield machine according to any one of claims 1 to 4, wherein a lubricant is sealed in the pin coupling portion. The bit device of a shield machine according to claim 5, wherein a pressure mechanism that pressurizes the lubricant is provided at the pin coupling portion. The pressure mechanism is
A cylinder hole formed in the swing pin along the swing axis direction;
A piston slidably inserted into the cylinder hole;
The bit device of the shield machine according to claim 6, further comprising an elastic member or / and a high-pressure gas that drives the piston in the cylinder hole.

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