JP2013124498A - Disc cutter switching device and method for cutter head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device and method for exchanging disc cutters of a cutter head, by which an operator can safely exchange the disc cutters, arrange the disc cutter at required pitches, and which is inexpensive.SOLUTION: In a cutter head 12 in which saddles 30 which support interchangeable twin-disc cutters 18A in a rotatable manner are mounted on mounting bases 31 via fixed plates 34, an exchanging device 40 capable of exchanging the twin-disc cutters together with the saddles inside a cutter box 16 under atmospheric pressure behind the cutter head is provided. The exchanging device includes: a knife gate valve 42 detachably connected to a rear end opening part of the mounting base instead of the fixed plate; an exchanging guide 44 detachably connected to the rear part of the knife gate valve and guiding back-and-forth movement of the saddle with respect to the mounting base; and an attachment/detachment jack 43 attached to the exchanging guide and moving the saddle forward and backward.

Description

  The present invention relates to a disk cutter exchanging apparatus and method for a cutter head in a tunnel excavator.

  In general, it is well known that a disk cutter (also referred to as a roller bit) is used in combination with an earth pressure shield excavator in order to prevent the chip of a cutter bit from being broken or separated from the gravel layer. In other words, the disk cutter is fixed and attached to the front surface of the cutter head with bolts, wedges, or the like.

  When the rock layer and the boulder layer are dug up and the excavation distance is long, the disc cutter is worn and worn, and the disc cutter needs to be replaced. Conventionally, in such a case, an operator enters a chamber defined by the cutter head and the partition wall of the excavator body, and the disk cutter is replaced by removing a fixing tool such as a bolt or wedge.

  Therefore, under the conditions where soil water pressure is applied, pressure work in the chamber is required, the work environment becomes worse, and if the soil water pressure becomes higher, pressure work becomes impossible in the work environment, and the disk cutter can be replaced. There was a problem that it was impossible.

  In addition, the ground improvement agent is injected into the front ground, and the ground is further improved by, for example, freezing the front ground, so that water, earth and sand do not flow into the chamber. There was also a method of entering the chamber and exchanging the disk cutter.

  However, according to this method, since the disk cutter is replaced after the ground is improved, the cost is high, and since it takes a considerable time until the ground is improved, the period for the replacement work becomes long. After all, there was a problem that the tunnel construction period also increased.

  Therefore, in recent years, Patent Document 1 and the like disclose a technique capable of exchanging a disk cutter without requiring a pneumatic work or ground improvement.

  This is because a cylindrical support body on which a disk cutter is pivotally supported is detachably fitted to a cylindrical mounting base fixed to a face plate of the cutter head and the like, and a hydraulically driven knife gate valve is mounted on the cylindrical mounting base. By attaching a removal guide through the blade and closing the knife gate valve, the operator can safely replace the disc cutter in a structure under atmospheric pressure (such as a cutter pork) behind the cutter head. It is.

West German Patent No. 4408992

  However, in the disc cutter exchanging device disclosed in Patent Document 1, etc., exchanging devices such as a hydraulically driven knife gate valve and a removal guide are attached to the cutter head for each disc cutter. Depending on the size of the device (jack stroke of the knife gate valve, etc.), the mounting interval (pitch) of the disc cutter is greatly limited, and a plurality of disc cutters cannot be effectively arranged on the cutter head. There is a problem that the cost of the process increases.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a disk cutter exchanging apparatus and method for a cutter head that allows an operator to safely replace a disk cutter, dispose the disk cutter at a required pitch, and is inexpensive. .

In order to achieve such an object, a disk cutter exchanging apparatus for a cutter head according to the present invention comprises:
In a cutter head in which a saddle that rotatably supports a disk cutter is mounted on a mounting base via a fixed plate,
An exchange device capable of exchanging the disk cutter in the structure under atmospheric pressure behind the cutter head for each saddle, and
The exchange device includes a knife gate valve that is detachably connected to a rear end opening of the mount in place of the fixed plate, and a detachably connected to the rear of the knife gate valve, and the mount of the saddle. An exchange guide that guides the advancement and retraction of the saddle, and a detachable jack that is attached to the exchange guide and moves the saddle forward and backward.
It is characterized by that.

Also,
The exchange device includes a stopper that temporarily fixes the saddle to the mounting base when the fixing plate is attached to or detached from the mounting base.
It is characterized by that.

Also,
When the knife gate valve is attached to and detached from the mounting base with a bolt, the exchange device is configured to be attached / detached using a bolt insertion hole with the valve body opened from the rear of the knife gate valve. ing,
It is characterized by that.

Also,
The exchanging device is configured so that when the saddle is exchanged by sliding the knife gate valve and an exchanging guide, the spacer is divided into a plurality of steps using a plurality of steps of spacers.
It is characterized by that.

Also,
An exchange bar is detachably interposed between the spacer located at the last stage and the extensible rod tip of the detachable jack, and the exchange bar is guided by a plurality of guide bars detachably attached to the exchange guide. The
It is characterized by that.

Also,
The disc cutter is a so-called back loading type that is attached from the rear side of the cutter head, and excavated earth and sand are taken into the chamber through a sand removal passage formed in the front wall portion of the cutter head.
It is characterized by that.

Also,
The disc cutter is a so-called front loading type that is attached from the front side of the cutter head, and excavated earth and sand are taken into the chamber through a relief space formed on the cutter mounting surface of the cutter head.
It is characterized by that.

In order to achieve such an object, the disk cutter exchanging method of the cutter head according to the present invention comprises the exchanging device, wherein the disc cutter in the middle part of the cutter head is arranged on the cutter pork, and the disc cutter in the peripheral part is arranged on the face plate. Used for the cutter head placed in
It is characterized by that.

  According to the disk cutter exchanging apparatus and method for a cutter head according to the present invention, the operator can safely exchange the disc cutter in the structure under atmospheric pressure behind the cutter head by closing the knife gate valve.

  In addition, the knife gate valve of the exchange device and the exchange guide with detachable jack are detachable and can be used only when replacing the disc cutter, so the knife gate valve and exchange guide with detachable jack are fixed. Interference between the exchange devices is eliminated, the disk cutter can be arranged at a required pitch, and the cost for the exchange device can be reduced.

1 is an overall side view of a disk cutter exchanging apparatus showing Embodiment 1 of the present invention. FIG. 2A is a front view, FIG. 2B is a side view, and FIG. 2C is a plan view. FIG. 2 is a structural explanatory view of a knife gate valve, in which FIG. 1 (a) is a rear view, and FIG. It is principal part sectional drawing of an earth pressure type shield excavator. It is a front view of an earth pressure type shield excavator (cutter head). It is explanatory drawing of the exchange procedure of a disk cutter. It is explanatory drawing of the exchange procedure of a disk cutter. It is explanatory drawing of the exchange procedure of a disk cutter. It is explanatory drawing of the exchange procedure of a disk cutter. It is explanatory drawing of the merit of a detachable exchange apparatus. It is explanatory drawing of the demerit of a fixed type exchange apparatus. FIG. 4A is a transverse sectional view of a cutter pork showing Embodiment 2 of the present invention, in which FIG. 4A is an attachment state diagram when excavating the disc cutter, and FIG. 2B is an attachment state diagram when exchanging the disc cutter.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a cutter head disk cutter exchanging apparatus and method according to the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is an overall side view of a disk cutter exchanging apparatus showing Embodiment 1 of the present invention, FIG. 2 is a mounting state diagram of the disk cutter during excavation, FIG. 1 (a) is a front view, and FIG. Fig. 3 (c) is a plan view, Fig. 3 is an explanatory view of the structure of a knife gate valve, Fig. 3 (a) is a rear view, Fig. 4 (b) is a side view, and Fig. 4 is an earth pressure shield excavator. FIG. 5 is a front view of an earth pressure type shield excavator (cutter head), FIG. 6 is an explanatory diagram of a disc cutter replacement procedure, FIG. 7 is an explanatory diagram of a disc cutter replacement procedure, and FIG. 8 is a disc cutter. FIG. 9 is an explanatory diagram of a disk cutter replacement procedure, FIG. 10 is an explanatory diagram of merits of the detachable exchanging device, and FIG. 11 is an explanatory diagram of demerits of the fixed exchanging device.

  As shown in FIGS. 4 and 5, a cutter head 12 includes an intermediate beam 13 and an intermediate ring (cutter drum) on a bulkhead 11 of an excavator main body 10 that forms a cylindrical shape of an earth pressure shield excavator (tunnel excavator). 14 is rotatably mounted by a bearing 15 with a ring gear.

  On the front surface of the cutter head 12, a plurality of (six in the illustrated example) cutter spokes 16 radiating from the center of rotation are fixed with a face plate 17 disposed therebetween. A number of cutter bits (not shown) and disk cutters (roller bits) 18 are mounted on the cutter pork 16 and the face plate 17.

  As shown in FIG. 5, an exchangeable twin disc cutter 18A is arranged in the middle portion of each cutter pork 16 and the peripheral portion of each face plate 17, and a fixed twin disc cutter 18B is arranged in the center portion of each cutter pork 16. Is disposed, and a fixed single disk cutter 18C is disposed in the periphery.

  The disk cutters 18 are arranged symmetrically with respect to each other so that the positions of the cutter heads 12 in the radial direction are different from those adjacent to each other in pairs, so that a non-excavated portion does not occur with respect to the face. It has become.

  The ring gear portion of the bearing 15 is engaged with a drive gear 20 of a plurality of cutter drive (turning) motors 19. Therefore, when the cutter drive motor 19 is operated to drive the drive gear 20 to rotate, the cutter head 12 is rotated via the ring gear portion of the bearing 15.

  In addition, a rotary joint 21 is assembled at the center of the bulkhead 11, and pressure oil is supplied to and discharged from a hydraulic device (not shown) via the rotary joint 21. .

  Further, a screw conveyor 22 is disposed inside the excavator body 10 so that earth and sand excavated by the cutter head 12 can be discharged to the rear of the tunnel. That is, the front end portion (outlet) of the screw conveyor 22 passes through the lower portion of the bulkhead 11 and opens into the chamber 23 defined by the cutter head 12 and the bulkhead 11 and is provided at the rear lower portion (not shown). The discharge port faces the belt conveyor arranged in the longitudinal direction in the tunnel.

  A plurality of propulsion jacks (not shown) that can be expanded and contracted with respect to existing segments (not shown) assembled on the inner peripheral surface of the tunnel are arranged on the inner peripheral portion of the excavator body 10 at a predetermined interval in the circumferential direction. In addition, an unillustrated erector for assembling the segment and a rear projecting stand are assembled to the rear portion of the excavator main body 10, and a segment adjuster for holding a perfect circle of the assembled segment is provided on the rear projecting stand.

  As shown in FIG. 2, the above-described replaceable twin disc cutter 18A is rotatably supported in a cylindrical saddle 30. The saddle 30 is cut by the cutter pork 16 (same for the face plate 17). Then, it is fitted fluid-tightly and slidable in the front-rear direction (moving forward and backward) on the inner periphery of a cylindrical mounting base 31 fixed through through the front wall portion 16a (described with the cut-out pork 16). In the figure, 32 is a seal.

  At the time of excavation, the saddle 30 is prevented from coming out backward by a fixing plate 34 coupled to the flange portion of the mounting base 31 by bolts 33. Further, it is preferable that the saddle 30 and the fixing plate 34 are also coupled by a plurality of bolts 35.

  Further, the front wall portion 16a has an inner end that passes through the mounting base 31 and engages with the saddle 30 so that the saddle 30 does not come out of the mounting base 31 when the twin disk cutter 18A is replaced. A pair of stoppers 36 that can be fixed are attached by a feed screw mechanism 37 so as to be able to advance and retract.

  In the figure, 30a is a pair of earth and sand removal holes formed in the cylinder wall of the saddle 30, and 31a is a pair of earth and sand removal holes formed in the cylinder wall of the mounting base 31 corresponding to the earth and sand removal holes 30a. , 38 are a pair of earth and sand removal passages formed in the front wall portion 16a of the cutter pork 16 corresponding to the earth and sand removing holes 30a and 31a, and the chamber 23 through a gap (opening) between the cutter pork 16 and the face plate 17 is provided. It leads to inside. Accordingly, the twin disk cutter 18A of this embodiment is a so-called back loading type that is attached from the rear side of the cutter head.

  As shown in FIG. 1, the twin disc cutter 18A exchanging device 40 comprises a ring-shaped spacer 41, a knife gate valve 42 described later, and an exchanging guide 44 with a detachable jack 43 for taking in and out the twin disc cutter 18A. These can be attached to and detached from the mounting base 31 in the cutter pork 16 instead of the fixing plate 34 described above. That is, the knife gate valve 42 is attached to the flange portion of the mounting base 31 by a plurality of bolts 45 penetrating the spacer 41, and the replacement guide 44 is also attached to the knife gate valve 42 by a plurality of bolts 46. Yes. In addition, by using a plurality of hydraulic jacks 43, the saddle 30 can be easily pulled out or inserted against the soil water pressure.

  As shown in FIG. 3, the knife gate valve 42 is configured to open and close a circular valve hole 48 formed in the valve body 47 by expansion and contraction of a pair of open / close jacks 50 by a rectangular valve body 49. When the valve hole 48 is closed by the valve body 49, the rear end opening of the mounting base 31 is closed, and the natural ground side and the inside of the cutter pork 16 are isolated. In the figure, 51 is a bolt insertion hole of the bolt 45 described above formed in a pair of flange portions of the knife gate valve 42, and 52 is formed in a flange portion on the near side as viewed from the operator of the knife gate valve 42. Further, it is a screw hole into which the aforementioned bolt 46 is screwed. Moreover, the valve body 48 can be easily opened and closed with respect to soil water pressure by making the open / close jack 50 hydraulic.

  Because of this configuration, when excavating with the earth pressure shield excavator, first, the cutter drive motor 19 is operated and the cutter head 12 is rotated at the initial position where all the propulsion jacks are contracted.

  Next, all or arbitrary propulsion jacks are extended from the above state to propel the excavator body 10 one stroke (advance). At this time, the propulsion reaction force is received in the existing segment. And by this propulsion, a large number of cutter bits and disk cutters 18 mounted on the cutter head 12 excavate the ground in front. The excavated earth and sand are discharged from the chamber 23 to the outside by the screw conveyor 22 or the like.

  Next, with the cutter head 12 stopped rotating, the propulsion jacks are partially partially contracted to assemble the segments with the erector and segment adjuster and hold the perfect circle. Thereafter, the above-described steps are repeated to excavate and form a tunnel having a predetermined length.

  In the present embodiment, when the replaceable twin disc cutter 18A is worn and worn during excavation and needs to be replaced, it is placed in the catspork 16 under atmospheric pressure via a passage such as a manhole (not shown). An operator enters and performs the exchange work using the exchange device 40 described above (see FIG. 1).

  The procedure for exchanging the twin disc cutter 18A will be described with reference to FIGS. In addition, when attaching, it is obvious to carry out in the reverse procedure of removing, and therefore the description is omitted.

  First, as shown in FIG. 6A, the stopper 36 is screwed by a feed screw mechanism 37 to prevent the saddle 30 from being detached from the mounting base 31, and then, FIG. 2A and FIG. Remove the fixing plate 34 shown in FIG.

  Next, the opened knife gate valve 42 is attached to the flange portion of the mounting base 31 with a bolt 45 through the spacer 41. At this time, the bolt 45 is screwed into the screw hole formed in the flange portion of the mounting base 31 through the bolt insertion hole 51 (see FIG. 3A) from the flange portion side of the knife gate valve 42.

  Next, an exchange guide 44 with a detachable jack 43 is attached with a bolt 46 to the front flange portion of the knife gate valve 42.

  Next, as shown in FIG. 6B, first, the first-stage cylindrical spacer 53a is inserted into the replacement guide 44 and connected to the saddle 30 with a plurality of bolts 55, and then the second-stage. The cylindrical spacer 53b is inserted and connected to the first-stage spacer 53a with a plurality of bolts 55, and then the third-stage cylindrical spacer 53c is inserted into the second stage with a plurality of bolts 55. Connected to the eye spacer 53b. A water-stop seal 54 is attached to the outer periphery of the second-stage spacer 53b while the saddle 30 is being pulled out.

  Next, after a plurality of guide bars 57 are attached to the flange portion of the replacement guide 44 by screwing or the like, the replacement bar 58 is connected to the third-stage spacer 53c with bolts 55 through the guide bars 57. A bracket 59 to which the distal end of the telescopic rod of the detachable jack 43 is connected is provided at the center of the exchange bar 58.

  Next, as shown in FIG. 7C, after connecting the distal end of the telescopic rod of the detachable jack 43 to the bracket 59 of the exchange bar 58, the stopper 36 is released and the detachable jack 43 is extended to the third stage. The saddle 30 is pulled in until the spacer 53c comes out of the replacement guide 44.

  Next, as shown in FIG. 7D, after the replacement guide 44 is passed through the second-stage spacer 53b and the intermediate stopper 60 is set by an appropriate means, the replacement bar 58 is moved to the third-stage spacer 53c. The third-stage spacer 53c is removed. At this time, a work hole for removing (loosing) the bolt 55 is formed in the replacement bar 58 in advance. Next, the detachable jack 43 is contracted, and the replacement bar 58 is now attached to the second-stage spacer 53b.

  Next, as shown in FIG. 8E, after releasing the intermediate stopper 60, the detachable jack 43 is extended and the saddle 30 is pulled in until the second-stage spacer 53 b comes out of the replacement guide 44.

  Next, as shown in FIG. 8F, after the replacement guide 44 is passed through the first stage spacer 53a and the intermediate stopper 60 is set by an appropriate means, the replacement bar 58 is moved to the second stage spacer 53b. After being detached from the second spacer 53b, the second-stage spacer 53b is removed. Next, the detachable jack 43 is contracted, and the replacement bar 58 is now attached to the first-stage spacer 53a.

  Next, as shown in FIG. 9G, after releasing the intermediate stopper 60, the detachable jack 43 is extended and the saddle 30 is pulled in until the first-stage spacer 53 a comes out of the replacement guide 44. At this time, the saddle 30 passes through the knife gate valve 42 and is positioned in the replacement guide 44. Next, the knife gate valve 42 is closed.

  Next, as shown in FIG. 9H, after the replacement bar 58 is detached from the first-stage spacer 53a, the first-stage spacer 53b is removed. Next, the guide bar 57 and the exchange bar 58 are removed from the exchange guide 44.

  Next, the replacement guide 44 is removed from the knife gate valve 42 with the saddle 30 installed. Thereafter, the replacement guide 44 is transported to an appropriate place, the saddle 30 is detached from the replacement guide 44, and the worn and worn old twin disk cutter 18A is discarded.

  Then, after the saddle 30 prepared with the new twin disc cutter 18A is mounted on the replacement guide 44, the replacement guide 44 is remounted on the knife gate valve 42. The saddle 30 can be attached to the mounting base 31 of the cutter pork 16.

  Thus, according to the present embodiment, by closing the knife gate valve 42, the natural ground (face) side and the inside of the cutter pork 16 are isolated from each other. An operator can safely exchange the replaceable twin disc cutter 18A for each saddle 30 in the cutter spoke 16.

  Further, the knife gate valve 42 of the exchange device 40, the exchange guide 44 with the detachable jack 43, etc. can be attached to and detached from the mounting base 31, and can be used by being reused only at the time of exchange. The exchange guides 44 and the like are fixed, so that there is no interference between the exchange devices, the disc cutters 18 can be arranged at a required pitch, and the excavation capacity can be increased by increasing the number of attachments of the disc cutters 18. Moreover, since it can be reused, the cost for the exchange device 40 can be reduced.

  As shown in FIG. 10, the knife gate valve 42 of the exchange device 40, the exchange guide 44 with the detachable jack 43, and the like are detachable, so that the knife gate valve 42 interferes with the adjacent twin disc cutter 18A (saddle 30). Therefore, the distance between the twin disc cutters 18A can be minimized.

  That is, as shown in FIG. 11, the knife gate valve 42 of the exchange device 40, the exchange guide 44 with the detachable jack 43, etc. are fixed, and the knife gate valve 42 is attached so as to open and close in the radial direction of the cutter head 12. In this case, the mounting pitch P of the twin disc cutter 18A is increased (see FIG. 11A), and when the knife gate valve 42 is mounted so as to open and close in the circumferential direction of the cutter head 12, the cutter pork 16 There is a problem that the spoke width W increases.

  Further, in this embodiment, when the knife gate valve 42 is attached to and detached from the mounting base 31 with the bolt 45, the knife gate valve 42 is attached using the bolt insertion hole 51 with the valve body 49 opened from the rear of the knife gate valve 42. Since it can be removed, the space for attaching / removing the knife gate valve 42 from the front is unnecessary, and the space for attaching / detaching the exchange device 40 can be reduced accordingly.

  Further, when the saddle 30 is replaced by sliding the spacer 41, the knife gate valve 42 and the replacement guide 44, the spacers 53a to 53c are put in and out in three steps using the three-stage spacers 53a to 53c. Since the stroke of the detachable jack 43 is shortened, the space for attaching / detaching the exchange device 40 can be reduced accordingly.

  An exchange bar 58 is detachably interposed between the spacer 53a to 53c positioned at the last stage and the extensible rod tip of the detachable jack 43, and the exchange bar 58 is detachably attached to the exchange guide 44. Since it is guided by the plurality of guide rods 57, the saddle 30 and the spacers 53a to 53c can be smoothly slid (advanced and retracted).

  In addition, when replacing the twin disc cutter 18A, the saddle 30 is temporarily fixed to the mounting base 31 with the stopper 36 when the fixing plate 34 is attached to or detached from the mounting base 31. Pulling out of the mounting base 31 by water pressure is avoided in advance.

  Further, since the replaceable twin disc cutter 18A in the middle portion of the cutter head 12 is disposed on the cutter pork 16, and the replaceable twin disc cutter 18A in the peripheral portion is disposed on the face plate 17, all of them arranged at the required pitch. The twin disc cutter 18A can be exchanged using the exchange device 40.

  FIG. 12 is a cross-sectional view of a cutter pork showing Embodiment 2 of the present invention, where FIG. 12 (a) is a mounting state diagram when excavating a disk cutter, and FIG. 12 (b) is a mounting state diagram when replacing the disk cutter. It is.

  This is an example in which the disc cutter exchanging apparatus is applied to a so-called front loading type twin disc cutter 18A in which the disc cutter is attached from the front side of the cutter head, instead of the back loading type twin disc cutter 18A of the first embodiment. .

  For example, as shown in the figure, a shallow concave portion 16b is formed in the front wall portion 16a of the cutter pork 16 so as to extend in the longitudinal direction, and the replaceable twin disc cutter 18A is placed in the shallow concave portion 16b. Attached through.

  More specifically, the short cylindrical saddle 30 of the twin disc cutter 18A is inserted into a cylindrical mounting base 31 fixed to the front wall portion 16a of the cutter pork 16 so as to be movable in the front-rear direction. And fixed by a fixing plate 34 (see FIG. 12A). That is, the fixing plate 34 and the mounting base 31 are coupled by the bolt 33, and the fixing plate 34 and the saddle 30 are also fixed by the bolt 33. A plurality of earth and sand guides 61 (three in the illustrated example) are arranged on both sides in the rotational direction of the twin disk cutter 18A.

  Accordingly, during excavation, the earth and sand excavated by the twin disc cutter 18A is taken into the chamber 23 (see FIG. 4) through the escape space in the shallow recess 16b in the cutter pork 16 (cutter mounting surface).

  The twin disc cutter 18A is exchanged by an operator in the cutter pork 16 under atmospheric pressure using an exchange device 40 including a stopper 36 and a knife gate valve 42. Since the exchange device 40 is the same as the exchange device 40 in the first embodiment, the structure and operation thereof will be omitted here with reference to the first embodiment.

  Also in this embodiment, the same effect as that of the first embodiment can be obtained.

  The present invention is not limited to the above-described embodiments, and various changes such as changing the number of detachable jacks 43, the number of spacers 53a to 53c, and the number of replaceable disc cutters are possible without departing from the spirit of the present invention. Needless to say.

  The tunnel excavator according to the present invention is not limited to the earth pressure type shield excavator, but can also be applied to a mud pressure, a mud type shield excavator, a tunnel boring machine (TBM), or the like.

DESCRIPTION OF SYMBOLS 10 Excavator main body 11 Bulk head 12 Cutter head 13 Intermediate beam 14 Intermediate ring 15 Bearing with ring gear 16 Catus pork 16a Front wall portion 16b Shallow recess 17 Face plate 18 Disc cutter 18A Exchangeable twin disc cutter 18B Fixed twin disc cutter 18C Fixed Single Disc Cutter 19 Cutter Drive Motor 20 Drive Gear 21 Rotary Joint 22 Screw Conveyor 23 Chamber 30 Saddle 30a Sediment Removal Hole 31 Mounting Base 31a Sediment Removal Hole 32 Seal 33 Bolt 34 Fixing Plate 35 Bolt 36 Stopper 37 Feed Screw Mechanism 38 Sediment removal passage 40 Exchanger 41 Spacer 42 Knife gate valve 43 Removable jack 44 Replacement guide 45 Bolt 46 Bolt 47 Valve body 48 Valve hole 49 Valve body 50 Opening / closing jack 1 bolt insertion hole 52 screw hole 53a~53c spacers 54 seal 55 bolt 57 guide rod 58 exchange bar 59 bracket 60 intermediate stopper 61 sediment Guide P mounting pitch W spoke width

Claims (8)

In a cutter head in which a saddle that rotatably supports a disk cutter is mounted on a mounting base via a fixed plate,
An exchange device capable of exchanging the disk cutter in the structure under atmospheric pressure behind the cutter head for each saddle, and
The exchange device includes a knife gate valve that is detachably connected to a rear end opening of the mount in place of the fixed plate, and a detachably connected to the rear of the knife gate valve, and the mount of the saddle. An exchange guide that guides the advancement and retraction of the saddle, and a detachable jack that is attached to the exchange guide and moves the saddle forward and backward.
A disk cutter exchanging device for a cutter head characterized by the above. The exchange device includes a stopper that temporarily fixes the saddle to the mounting base when the fixing plate is attached to or detached from the mounting base.
2. A disk cutter exchanging apparatus for a cutter head according to claim 1, wherein When the knife gate valve is attached to and detached from the mounting base with a bolt, the exchange device is configured to be attached / detached using a bolt insertion hole with the valve body opened from the rear of the knife gate valve. ing,
3. A disk cutter exchanging apparatus for a cutter head according to claim 1, wherein the disk cutter is replaced by a disk cutter. The exchanging device is configured so that when the saddle is exchanged by sliding the knife gate valve and an exchanging guide, the spacer is divided into a plurality of steps using a plurality of steps of spacers.
4. A disk cutter exchanging apparatus for a cutter head according to claim 1, 2, or 3. An exchange bar is detachably interposed between the spacer located at the last stage and the extensible rod tip of the detachable jack, and the exchange bar is guided by a plurality of guide bars detachably attached to the exchange guide. The
5. The disk cutter exchanging apparatus for a cutter head according to claim 4, wherein The disc cutter is a so-called back loading type that is attached from the rear side of the cutter head, and excavated earth and sand are taken into the chamber through a sand removal passage formed in the front wall portion of the cutter head.
6. A disk cutter exchanging apparatus for a cutter head according to claim 1, wherein the disk cutter exchanging apparatus is a cutter head. The disc cutter is a so-called front loading type that is attached from the front side of the cutter head, and excavated earth and sand are taken into the chamber through a relief space formed on the cutter mounting surface of the cutter head.
6. A disk cutter exchanging apparatus for a cutter head according to claim 1, wherein the disk cutter exchanging apparatus is a cutter head. The exchanging device according to any one of claims 1 to 5, wherein a disk cutter in an intermediate part of the cutter head is arranged on a cutter pork and a disk cutter in a peripheral part is arranged on a face plate. Use to replace the disc cutter,
A disc cutter exchanging method for a cutter head.

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