JP3623763B2 - Mud machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mud type excavator equipped with a pinch valve that performs opening / closing and / or flow control of a mixture of a granular material and a liquid, a liquid, a granular material, or a gas.
[0002]
[Prior art]
A typical prior art is a gate valve. For example, in a mud type excavator that excavates a horizontal hole in the ground, such a gate valve is interposed in the middle of the mud pipe when discharging the earth and sand excavated from the face through the mud pipe. The gate valve may not be fully closed due to the biting of earth and sand, and may not be able to achieve a predetermined opening degree to achieve a desired throttle amount. As a result, the pressure of the high-concentration liquid that stabilizes the face cannot be maintained at a desired value. The gate valve is large.
[0003]
[Problems to be solved by the invention]
An object of the present invention is to provide a mud-type excavator equipped with a miniaturized pinch valve that prevents biting due to granular materials such as earth and sand, achieves a fully closed state and an opening degree having a desired flow path cross-sectional area Is to provide.
[0004]
[Means for Solving the Problems]
The present invention provides (a) a leading conductor,
Skin plate,
A cutter unit that is disposed in front of the skin plate, is driven to rotate coaxially with the skin plate, and excavates the face;
A partition wall provided behind the cutter unit,
Between the cutter part and the partition wall, a leading conductor to which a high-concentration liquid material is supplied under pressure;
(B) In a mud type excavator composed of a succeeding body connected to a leading conductor,
(C) a drilling piece provided on the cutter unit and projecting radially outward from the skin plate and displaceable;
(D) provided on the cutter unit and provided with excavation piece drive means for displacing the excavation piece;
(E) The connection between the leading conductor and the succeeding body is such that the axis of the leading conductor and the axis of the succeeding body can be mutually changed;
(F) a direction correcting jack that changes the propulsion direction by changing each axis;
(G) a mud pipe for supplying a high-concentration liquid material to the excavation chamber between the cutter part and the partition;
(H) a drainage pipe for discharging earth and sand from the excavation room;
(I) including a pinch valve interposed in the middle of the drainage pipe in the leading conductor,
This pinch valve
A rigid outer cylinder,
A rigid inner cylinder that is accommodated coaxially in the outer cylinder and has an outer surface that forms an air storage space extending in the circumferential direction between the inner surface of the outer cylinder and a connection hole that penetrates in the radial direction;
A sleeve housed in the inner cylinder and having flexibility, both ends in the axial direction being fixed to the inner cylinder;
A pneumatic circuit for opening / closing the inside of the sleeve by supplying / discharging compressed air to / from the air storage space ;
Having annular end plates respectively disposed at both ends of the outer cylinder,
Faced with the end faces of both ends of the outer cylinder, end plate fixing female screws are formed,
Through bolts that pass through the end plates are removably screwed to the end plate fixing female screws, and each end plate is removably attached to both ends of the outer cylinder,
The head of the penetrating bolt enters the end plate and is inward in the axial direction from the outer end surface of the end plate,
The end plate is formed with a female screw facing outward in the axial direction,
The flange of the drainage pipe is fixed by a bolt that is removably screwed to the female screw,
An annular sealing material is interposed between the end plate and the flange,
With this end plate in contact with the end surface of the inner cylinder, the end of the sleeve is elastically compressed inward in the axial direction,
An O-ring is interposed between the inner surface of both ends of the outer cylinder and the outer surface of both ends of the inner cylinder,
The inner surfaces of both ends of the inner cylinder
A frustoconical surface inclined such that the inner diameter increases as it goes inward in the axial direction;
An O-ring storage portion that is connected to the axially inner end of the truncated cone surface and forms an annular groove into which the O-ring is fitted;
An abutting portion that is continuous with the axially inner end of the O-ring storage portion and has a uniform inner diameter along the axial direction;
The imaginary cross section including the axis lined inward in the axial direction of the abutting part includes a raised portion formed in a trapezoid whose length in the axial direction becomes shorter as it becomes radially inward,
The outer peripheral surface of the both ends of a sleeve is a mud type excavation machine characterized by being fixed to each inner surface of a truncated cone surface, an O-ring storage part, a contact part, and a protruding part .
[0005]
According to the present invention, the vertical conductor is excavated in the soil to store the leading conductor, and the succeeding bodies are sequentially connected to excavate the lateral hole while pushing the leading conductor. A high-concentration liquid material is injected under pressure between the face and the partition wall of the leading conductor to stably support the face and prevent the face from collapsing. This face is excavated by the cutter unit. In order to excavate a horizontal hole curved left and right or up and down, a excavation piece such as a cutter bit or a roller bit protrudes radially outward from the outer surface of the skin plate by an excavation piece drive means such as a hydraulic cylinder, and the cutter portion , A horizontal hole having an inner surface larger than the outer surface of the skin plate is formed. In this way, a gap is formed between the outer surface of the skin plate and the inner surface of the horizontal hole, and this gap is filled with the high-concentration liquid material, so to speak, a tail void portion is formed. The leading conductor and the succeeding body can be changed in their respective axes, and the axes of the succeeding and succeeding succeeding bodies can also be changed, and each axis of the leading conductor and the succeeding body can be changed by the direction correcting jack. Set the change of the axis of the succeeding body. As a result, the axis of the horizontal hole is smoothly curved. The outer shape of the leading conductor and the succeeding body is a right cylindrical shape.
According to the present invention, a mud pipe is provided in the excavation chamber so as to stabilize the face by pressurizing a high-concentration liquid material on the face, and the ground part excavated by the cutter part and the excavation piece is provided. Sediment is discharged from the excavation chamber by a sludge drain.
According to the present invention, the rigid outer cylinder and the rigid inner cylinder constitute a case, an air storage space is formed between the inner surface of the outer cylinder and the outer surface of the inner cylinder, and the inner cylinder is flexible. By disposing the sleeve and supplying compressed air into the air storage space, the compressed air acts on the outer surface of the sleeve from the connection hole, and the flow path cross-sectional area formed by the sleeve can be changed. Therefore, the fully closed state can be achieved without biting the granular material, and the desired opening degree can be achieved. Further, such a configuration can be realized in a smaller size as compared with the aforementioned gate valve. The sleeve is made of a material such as rubber, for example, and may have a spring force that comes back in contact with the inner surface of the inner cylinder in a natural state.
[0006]
The present invention is implemented in order to control the flow rate of a mixture of earth and sand by being interposed in the middle of a sludge pipe in a mud type excavator .
[0010]
The present invention is the opposite ends of the sleeve, the abutting portion to elastically expanded and pressed by the annular reinforcing member is characterized that you have been buried.
[0011]
According to the present invention, as clearly disclosed in FIG. 19 to be described later, the annular end plates attached to the both ends of the outer cylinder compress the ends of the sleeve resiliently, and the end plates The cylinder is fixed to the outer cylinder so that the inner cylinder is not displaced in the axial direction. Further, leakage of compressed air in the air storage space is prevented using an O-ring.
[0012]
Furthermore, according to the present invention, the frustoconical surface, the O-ring storage portion, the abutting portion, and the raised portion are formed in the axially inward in this order on the inner surfaces of the both ends of the inner cylinder, and both ends of the sleeve By fixing the outer surface, a space in which airtightness is ensured is formed in an axially inward range from the both ends of the inner tube on the inner surface of the inner tube and the outer surface of the sleeve. As a result, the sleeve can be reliably deformed by the action of compressed air.
[0013]
By the action of the annular reinforcing material provided in the sleeve, the inner surface of the inner cylinder and the outer surface of the sleeve are elastically expanded and pressed against the contact portions formed on the inner surfaces of both ends of the inner cylinder. The airtightness between the two can be achieved more reliably.
[0015]
According to the present invention, the bolt that is formed on the end plate and is inserted through the flange of the pipe to be connected is removably screwed to the screw, so that the pinch valve and the pipe are connected.
[0017]
According to the present invention, a through bolt that penetrates the end plate is screwed to an end plate fixing female screw formed on the outer end surface of the outer cylinder, and the end plate is connected via an annular seal material. An intermediate flange is attached, and the head of the penetrating bolt enters the end plate, that is, the head of the penetrating bolt does not protrude outward from the outer end surface of the end plate. It is possible to reliably achieve airtightness between the flange and the flange.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a partial cross-sectional view of a mud-type excavator 1 according to an embodiment of the present invention, FIG. 2 is a perspective view showing a part of the mud-type excavator 1, and FIG. FIG. 4 is a front view of the thick excavator 1, FIG. 4 is a simplified horizontal sectional view of the mud excavator 1, and FIG. 5 is a simplified vertical sectional view of the mud excavator 1. The mud-type excavator 1 includes a leading conduit 2 that is basically a leading conductor and a trailing tube 3 that is a succeeding body that is sequentially connected to the leading conduit 2. The front conduit 2 includes a right cylindrical skin plate 4 and a cutter portion 5 disposed in front of the skin plate 4. The cutter unit 5 has a cutter bit 7 and disc cutters 8, 9, 10 attached to the front part of the cutter unit body 6, and is driven to rotate about the same axis 11 as the skin plate 4. The earth and sand generated by excavating the face 12 enter the excavation chamber 16 through the soil removal hole 13 of the cutter unit body 6. The excavation chamber 16 is defined and formed by a partition wall 17 behind the cutter unit 5 (to the right in FIGS. 1, 4, and 5). The partition wall 17 is fixed to the skin plate 4. In the cutter unit body 6, a rotating shaft 18 coaxial with the axis 11 extends rearward of the skin plate 4 and penetrates the partition wall 17 in an airtight manner. The cutter unit body 6 is formed with a substantially cylindrical scraper 19 inside the skin plate 4, and the cutter unit 5 is rotatably supported by the skin plate 4 by the bearing 20 as described above. An annular internal gear 21 is fixed to the scraper 19. The external gear 22 meshes with the internal gear 21. The internal gear 21 is rotationally driven by a motor 23 realized by a hydraulic motor or an electric motor.
[0019]
6 is a front view showing the cutter unit 5 in a simplified manner as viewed from the front of the leading conduit 2. FIG. 7 is a cross-sectional view taken along the section line VII-VII in FIG. 4, and FIG. It is sectional drawing seen from the cut surface line VIII-VIII. A mud pipe 25 and a mud pipe 26 are fixed to the partition wall 17. The ends of these tubes 25, 26 face the excavation chamber 16. The drainage pipe 26 may be provided with a pinch valve 27 in the leading pipe 2, and further a pinch valve 28 may be provided in the subsequent pipe 3 a. The front part of the succeeding pipe 3a is partially fitted in the rear part of the skin plate 4 of the leading pipe 2, and the axis 11f of the leading pipe 2 and the axis 11a of the trailing pipe 3 are connected to each other so as to be mutually changeable. Is done. Therefore, there is a gap between the rear inner peripheral surface of the skin plate 4 of the leading conduit 2 and the front inner peripheral surface of the succeeding pipe 3a. In the present specification, numerical reference marks may be indicated by subscripts a, b, c,...
[0020]
A direction-correcting jack 29 is interposed between the rear part of the skin plate 4 of the leading pipe 2 and the front part of the succeeding pipe 3 a, and both ends of the jack 29 are connected to the leading pipe 2 and the trailing pipe by pins 30 and 31. 3 is connected. The axes of the pins 30 and 31 are perpendicular to a virtual plane including the axis 11f, and the longitudinal axis of the jack 29 exists in this virtual plane.
[0021]
As clearly shown in FIG. 8 described above, a plurality of, for example, a total of four jacks 29 are arranged at equal intervals around the axis 11f in the circumferential direction, for example, 90 degrees in this embodiment. Is done. The jack 29 can be individually expanded and contracted by a hydraulic circuit to adjust and set the mutual change between the axis 11f of the front conduit 2 and the axis 11a of the subsequent pipe 3a. The succeeding pipes 3a and 3b adjacent to each other are also connected by a jack 29 similar to that described above.
[0022]
FIG. 9 is a partial cross-sectional view taken along the section line IX-IX in FIG. In the present invention, the cutter body 5 of the cutter unit 5 is provided with a cutter bit 32, which is an excavation piece, behind the above-described cutter bit 7 and disk cutters 8 to 10 and in front of the skin plate 4. As shown by an imaginary line 33, the projection protrudes radially outward and is displaceable. The base end portion of the cutter bit 32 is fixed to the coupling body 34. This connecting body 34 is connected to a piston rod 36 of a double-acting hydraulic cylinder 35 which is a driving means for excavation pieces.
[0023]
As shown in FIG. 9, a guide portion 38 having a guide hole 37 is fixed to the cutter body 6. The connecting body 34 has a rectangular cross section perpendicular to the axis of the connecting body 34, and thus the radial direction of the cutter unit 5, and is, for example, a square or a rectangle. The guide hole 37 guides the coupling body 34 and the cutter bit 32, and the cross section perpendicular to the axis of the guide hole 37 may be a rectangle corresponding to the cross-sectional shape of the coupling body 34. Therefore, the connecting body 34 and the cutter bit 32 are prevented from being angularly displaced around the axis of the connecting body 34. As a result, the cutter bit 32 can surely excavate the inner surface of the lateral hole 39 formed by excavation of the face 12 outside the outer surface of the skin plate 4 in the radial direction. As a result, a tail void portion 40 is formed between the outer surface of the skin plate 4 and the inner surface of the horizontal hole 39 cut by the cutter bit 32.
[0024]
FIG. 10 is an overall system diagram showing a state where the mud-type excavator 1 is excavating the ground. The leading conduit 2 is accommodated in a vertical hole 42 formed in the ground, and the rear portion of the leading conduit 2 is pushed into the ground by the main pushing device 43. Subsequent pipes 3 are sequentially connected to the front pipe 2, and the rear part of the subsequent pipe 3 is similarly pushed by a main pushing device 43. A high-concentration liquid material is pumped from the pump 45 through the pipe 46 to the mud pipe 25. The muddy water discharged from the mud pipe 26 is discharged from the pipe line 27 to the mud container 48 through the pinch valves 27 and 28 described above. The discharged earth and sand are settled in the settling tank 49, classified by the vibrating screen 50, and discharged. The small-diameter earth and sand obtained by the sieve 50 is fed from the settling tank 51 to the adjustment tank 52 and mixed with water, and from the adjustment tank 52 through the mud feeding plant 53, becomes a high-concentration liquid containing earth and sand. 45 is supplied from the pipe 46 to the mud pipe 25. The high-concentration liquid material from the mud pipe 25 is supplied into the excavation chamber 16 at a high pressure, and further supplied to the space between the face 12 and the cutter unit 5 through the soil discharge holes 13 to 15. Accordingly, the face 12 is stably supported, and the face 12 is prevented from collapsing. The liquid is also supplied to the tail void portion 40. The earth and sand obtained by excavating the face 12 is discharged from the excavation chamber 16 through the drainage holes 13 to 15 and the mud pipe 26 and the pinch valves 27 and 28 as described above.
[0025]
FIG. 11 is a simplified longitudinal sectional view showing a state where the mud type excavator 1 of the present invention excavates in the ground and curves upward or downward to form a horizontal hole. 11 (1) shows a state in which a lateral hole curved upward in the propulsion direction is formed, and FIG. 11 (2) shows a state in which a lateral hole curved downward in the propulsion direction is formed. In FIG. 11 (1), for example, the jacks 2 9a and 2 9d shown in FIG. 8 are reduced, and the jacks 2 9b and 2 9c below are extended. In FIG. 11 (2), the jacks 2 9a and 2 9d are extended, and the lower jacks 2 9b and 2 9c are reduced.
[0026]
In another embodiment of the present invention, in order to form a transverse hole which is curved underground left or right, reducing the right jack 2 9a, 2 9d shown in FIG. 8 (or extension) to the left jack 2 9b, 2 9c is expanded (or reduced). To form curved in the vertical direction and the horizontal direction further transverse bore in the ground, by the relative change in length of the jack 2. 9a through 2 9d, can be formed. This is also true with respect to the jack 2 9 provided subsequent tube 3a, between 3b.
[0027]
Referring again to FIG. 1, in order to supply hydraulic oil to the hydraulic cylinder 35, a hydraulic oil path 54 is formed in the rotary shaft 18, and a hydraulic circuit 56 is connected via a rotary fitting 55. The rotary joint 55 has a cylindrical body 57 in which the rotary shaft 18 is provided at a fixed position behind the partition wall 17. The plurality of hydraulic oil passages 54 are connected to each other via a radial hole extending in the radial direction on the rotary shaft 18, and the radial holes are arranged at intervals in the axial direction of the rotary shaft 18. The diameter hole communicates with each annular groove formed on the inner surface of the cylindrical body 57, and the annular groove is individually connected to the hydraulic circuit 56.
[0028]
The position sensor 59 detects the expansion / contraction state of the hydraulic cylinder 35, and hence the radial position of the cutter bit 32 in the cutter unit 5. The electrical signal output of the position sensor 59 is taken out from the slip ring 61 via a cable provided in the rotary shaft 18 and is given to the control circuit 62. The control circuit 62 controls the hydraulic circuit 56 so that the cutter bit 32 is at a desired position. The cutter bit 32 can be positioned to project radially outward from the outer surface of the skin plate 4 like a virtual line 33, but is located at the same position as the outer surface of the skin plate 4 or radially inward thereof. At this time, a linear lateral hole can be formed.
[0029]
FIG. 12 is a cross-sectional view schematically showing a front conduit 2 of a mud excavator 1 according to another embodiment of the present invention, and FIG. 13 is a simplified perspective view of the front conduit 2 shown in FIG. is there. The embodiment shown in FIGS. 12 and 13 is similar to the embodiment shown in FIGS. 1 to 11 described above, and corresponding parts are denoted by the same reference numerals. It should be noted that in this embodiment, the coupling body 34 driven by the double-acting hydraulic cylinder 35 has a roller bit 65 in front of the cutter body 6 via the mounting portion 64 (leftward in FIG. 12). Is fixed. In this embodiment, for example, six roller bits 65 are arranged at equal intervals around the axis 11 in the circumferential direction, and each roller bit 65 is driven in the radial direction by an individual hydraulic cylinder 35. The roller bit 65 has a bit axis 66 that is inclined by an angle 向 P toward the axis 11 of the cutter unit 5 toward the front of the cutter unit 5 (leftward in FIG. 12, downstream in the forward direction). The mounting portion 64 is provided so as to be rotatable around. The roller bit 65 has a multi-mountain-separated shape that is formed to have a smaller diameter as it becomes radially inward of the cutter unit 5. Other configurations are the same as those of the above-described embodiment.
[0030]
FIG. 14 is a perspective view of a mud excavator 1 according to still another embodiment of the present invention. In this embodiment, the cutter unit body 6 of the cutter unit 5 is basically formed in a + -shape, and a cutter bit, a disc cutter, and the like are mounted on the cutter unit body 6 as described above. The mud-type excavator of FIG. 14 can also be curved and propelled as indicated by the arrow 67 to form a horizontal hole that is smoothly curved in the left / right / vertical direction. Other configurations of the embodiment of FIG. 14 are the same as those of the above-described embodiment.
[0031]
FIG. 15 is a simplified front view of a mud type excavator 1 according to still another embodiment of the present invention. In the cutter unit 5 of this mud type excavator, a cutter bit 7 is fixed to a substantially Y-shaped cutter unit body 6. In another embodiment of the present invention, the cutter unit 5 may have a shape different from that of the above-described embodiment.
[0032]
16 is a vertical cross-sectional view of the pinch valve 27, FIG. 17 is a left side view of the pinch valve 27, and FIG. 18 is a cross-sectional view of the pinch valve 27 taken along section line XVIII-XVIII in FIG. The pinch valve 27 is configured by housing a sleeve 74 in the inner cylinder 72 of a case 73 including a rigid outer cylinder 71 and a rigid inner cylinder 72 accommodated coaxially in the outer cylinder 71. The outer cylinder 71 and the inner cylinder 72 are made of metal such as stainless steel, for example, and the sleeve 74 is flexible and may be elastic, and is made of natural rubber or synthetic rubber. Also good. The outer cylinder 71 and the inner cylinder 72 are substantially cylindrical, and the sleeve 74 is also a cylindrical cylinder in a natural state, and the outer surface of the sleeve 74 is elastically formed on the inner surface of the inner cylinder 72 in a natural state. May contact each other.
[0033]
19 is an enlarged cross-sectional view of section A of FIG. An air storage space 76 extending in the circumferential direction is formed between the inner surface of the outer cylinder 71 and the outer surface of the inner cylinder 72. A plurality of connection holes 77 (see FIG. 16) penetrating in the radial direction are formed in the inner cylinder 72.
[0034]
A compressed air supply port 78 and a compression port discharge port 79 provided in the outer cylinder 71 communicate with the air storage space 76, and the supply port 78 and the discharge port 79 are connected to a pneumatic circuit 81.
[0035]
The mud drain pipe 26 communicates with a sediment discharge path 82 in which a sleeve 74 is formed.
An annular end plate 84 is detachably attached to both ends of the outer cylinder 71 by bolts 85. With the end plate 84 in contact with the end surface 86 of the outer cylinder 71 or facing the end surface 86 with a slight gap, the end plate 84 contacts the end surface 87 of the inner cylinder 72. Presses the outer end surface 89 of the sleeve 74 so that the end of the sleeve 74 is elastically compressed to the right in the axially inward direction (FIG. 19). This achieves hermeticity.
[0036]
An O-ring 90 is interposed between the inner surfaces of both ends of the outer cylinder 71 and the outer surfaces of both ends of the inner cylinder 72, and the air is more axially inward (right side in FIG. 19) than the O-ring 90. The airtightness of the storage space 76 is improved.
[0037]
On the inner surfaces of both ends of the inner cylinder 72, a truncated cone surface 91, an O-ring storage portion 92, a contact portion 93, and a raised portion 94 are formed in this order from the outside in the axial direction to the inside. The frustoconical surface 91 is inclined so that the inner diameter becomes larger inward in the axial direction. The O-ring storage portion 92 is connected to the axially inward end of the truncated cone surface 91 and extends in a radial inward direction perpendicular to the axial line, and a second vertical portion 97 extends perpendicular to the axial direction. including. The contact portion 93 is connected to the second vertical portion 97 which is an end portion on the inner side in the axial direction of the O-ring storage portion 92, and is formed in a right cylindrical shape having a uniform inner diameter along the axial direction.
[0038]
The raised portion 94 has a trapezoidal virtual cross section in a virtual plane including the axis (the paper surface of FIG. 9), and the first inclined portion 98 continuous inward in the axial direction of the contact portion 93 and the inner diameter along the axial direction are one. Such a straight cylindrical tube portion 99 and a second inclined portion 100 are included.
[0039]
The outer peripheral surfaces of both ends of the sleeve 74 are fixed to the inner surfaces of the truncated cone surface 91, the O-ring storage portion 92, the contact portion 93, and the raised portion 94. For example, an adhesive may be used for the fixing. At both ends of the sleeve 94, an annular reinforcing material 101 that is elastically expanded and pressed against the inner surface of the contact portion 93 is embedded. The reinforcing material 101 may be made of a metal such as a piano wire and has elasticity.
[0040]
The end plate 84 is formed with a female screw 102 facing outward in the axial direction. The flange 103 of the mud pipe 26 to be connected is fixed by a bolt 104 that is removably screwed to the female screw 102.
[0041]
An end plate fixing female screw 105 is formed facing the end surface of the outer cylinder. A shaft portion 107 of a through bolt that passes through the bolt insertion hole 106 of the end plate 84 is removably screwed to the end plate fixing female screw 105. The head 108 of the through-bolt 85 enters the bolt insertion hole 106 of the end plate 84 and is axially inward (rightward in FIG. 19) from the left outer end surface of the end plate 84 in FIG. is there. The head 108 is screwed in contact with the step of the bolt insertion hole 106. An annular sealing material 109 made of a resilient material such as rubber is interposed between the end plate 84 and the flange 103, and the airtightness is improved.
[0042]
As shown in FIG. 16, the pressure sensor 111 is provided in, for example, the partition wall 17 facing the excavation chamber 16, and detects the pressure of the high-concentration liquid material that contacts the partition wall 16, and thus the face 12. The output of the pressure sensor 111 is given to the control circuit 112 via the slip ring 61, whereby the control circuit 112 controls the pneumatic circuit 81, and the pressure detected by the pressure sensor 111 stabilizes the ground of the face 12. And the control action is performed so that a value in the pressure range suitable for preventing collapse is selected.
[0043]
【The invention's effect】
According to the present invention, it is possible to easily achieve a fully closed state of a fluid containing particulate matter such as earth and sand, and to accurately set the flow rate of such particulate matter to a desired value. In addition, the configuration can be downsized compared to a gate valve or the like.
[0044]
Moreover, according to this invention, the leakage of the compressed air for deforming a sleeve can be prevented reliably. Furthermore, disassembly and assembly are easy, and maintenance becomes easy. By using the compressed air, the fully closed state can be reliably achieved by sandwiching the granular material between the inner surfaces of the sleeve as described above due to the compressibility of the compressed air.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional view of a mud excavation machine 1 according to an embodiment of the present invention.
FIG. 2 is a perspective view showing a part of the mud type excavator 1. FIG.
FIG. 3 is a front view of the mud type excavation machine 1;
FIG. 4 is a simplified horizontal sectional view of the mud type excavator 1.
FIG. 5 is a simplified longitudinal sectional view of the mud type excavator 1.
6 is a front view showing the cutter unit 5 in a simplified manner as viewed from the front of the leading conduit 2. FIG.
7 is a cross-sectional view taken along section line VII-VII in FIG. 4;
8 is a cross-sectional view taken along section line VIII-VIII in FIG. 4;
FIG. 9 is a partial cross-sectional view taken along section line IX-IX in FIG. 1;
FIG. 10 is an overall system diagram showing a state where the mud-type excavator 1 is excavating the ground.
FIG. 11 is a simplified longitudinal sectional view showing a state where the mud type excavator 1 of the present invention excavates in the ground and curves upward or downward to form a horizontal hole.
FIG. 12 is a cross-sectional view schematically showing a front conduit 2 of a mud excavation machine 1 according to another embodiment of the present invention.
13 is a simplified perspective view of the leading conduit 2 shown in FIG.
FIG. 14 is a perspective view of a mud type excavator 1 according to still another embodiment of the present invention.
FIG. 15 is a simplified front view of a mud type excavator 1 according to still another embodiment of the present invention.
16 is a longitudinal sectional view of the pinch valve 27. FIG.
17 is a left side view of the pinch valve 27. FIG.
18 is a cross-sectional view of the pinch valve 27 as seen from the cutting plane line XVIII-XVIII in FIG.
FIG. 19 is an enlarged cross-sectional view of section A of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Mud-type excavator 2 Lead pipe 3, 3a, 3b Subsequent pipe 4 Skin plate 5 Cutter part 7 Cutter bit 8-10 Disc cutter 12 Face 16 Excavation chamber 17 Partition 18 Rotating shaft 21 Internal gear 22 External gear 23 Motor 25 Mud pipe 26 Drain pipe 27, 28 Pinch valve 29 Direction correction jack 30, 31 Pin 34 Connecting body 35 Hydraulic cylinder 36 Piston rod 37 Guide hole 38 Guide part 39 Horizontal hole 42 Vertical hole 54 Hydraulic oil path 55 Rotary pipe joint 61 Slip ring 65 Roller bit 71 Outer cylinder 72 Inner cylinder 73 Case 74 Sleeve 76 Air storage space 77 Connection hole 81 Pneumatic circuit 84 Annular end plate 85 Through bolt 90 O-ring 91 Frustum surface 92 O-ring storage portion 93 Abutment portion 94 Part 101 Reinforcing material 102 Female thread 103 Flange 104 Bolt 105 End plate fixing female thread 106 Bolt insertion hole 108 Head 109 Annular sealing material 111 Pressure sensor

Claims (2)

(A) a leading conductor,
Skin plate,
A cutter unit that is disposed in front of the skin plate, is driven to rotate coaxially with the skin plate, and excavates the face;
A partition wall provided behind the cutter unit,
Between the cutter part and the partition wall, a leading conductor to which a high-concentration liquid material is supplied under pressure;
(B) In a mud type excavator composed of a succeeding body connected to a leading conductor,
(C) a drilling piece provided on the cutter unit and projecting radially outward from the skin plate and displaceable;
(D) provided on the cutter unit and provided with excavation piece drive means for displacing the excavation piece;
(E) The connection between the leading conductor and the succeeding body is such that the axis of the leading conductor and the axis of the succeeding body can be mutually changed;
(F) a direction correcting jack that changes the propulsion direction by changing each axis;
(G) a mud pipe for supplying a high-concentration liquid material to the excavation chamber between the cutter part and the partition;
(H) a drainage pipe for discharging earth and sand from the excavation room;
(I) including a pinch valve interposed in the middle of the drainage pipe in the leading conductor,
This pinch valve
A rigid outer cylinder,
A rigid inner cylinder that is accommodated coaxially in the outer cylinder and has an outer surface that forms an air storage space extending in the circumferential direction between the inner surface of the outer cylinder and a connection hole that penetrates in the radial direction;
A sleeve housed in the inner cylinder and having flexibility, both ends in the axial direction being fixed to the inner cylinder;
A pneumatic circuit for opening / closing the inside of the sleeve by supplying / discharging compressed air to / from the air storage space ;
Having annular end plates respectively disposed at both ends of the outer cylinder,
Faced with the end faces of both ends of the outer cylinder, end plate fixing female screws are formed,
Through bolts that pass through the end plates are removably screwed to the end plate fixing female screws, and each end plate is removably attached to both ends of the outer cylinder,
The head of the penetrating bolt enters the end plate and is inward in the axial direction from the outer end surface of the end plate,
The end plate is formed with a female screw facing outward in the axial direction,
The flange of the drainage pipe is fixed by a bolt that is removably screwed to the female screw,
An annular sealing material is interposed between the end plate and the flange,
With this end plate in contact with the end surface of the inner cylinder, the end of the sleeve is elastically compressed inward in the axial direction,
An O-ring is interposed between the inner surface of both ends of the outer cylinder and the outer surface of both ends of the inner cylinder,
The inner surfaces of both ends of the inner cylinder
A frustoconical surface inclined such that the inner diameter increases as it goes inward in the axial direction;
An O-ring storage portion that is connected to the axially inner end of the truncated cone surface and forms an annular groove into which the O-ring is fitted;
An abutting portion that is continuous with the axially inner end of the O-ring storage portion and has a uniform inner diameter along the axial direction;
The imaginary cross section including the axis lined inward in the axial direction of the abutting part includes a raised portion formed in a trapezoid whose length in the axial direction becomes shorter as it becomes radially inward,
A mud-type excavator characterized in that the outer peripheral surfaces of both ends of the sleeve are fixed to the inner surfaces of the truncated cone surface, the O-ring storage portion, the abutting portion and the raised portion . The said end portions of the sleeve, mud dark type excavator according to claim 1, wherein said abutment portion elastically expanded and pressed by the annular reinforcement, characterized that you have been buried.

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