JP2007205104A - Rotating mechanism and excavator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To excavate a noncircular excavation cross section, by providing circular and noncircular loci in the same center, while reducing rotational run-out and vibration of a driving system and reducing the driving system and design cost. <P>SOLUTION: This rotating mechanism has a central shaft 31 rotatably arranged around the predetermined fixed center line O, a main blade member 211 (a main excavation cutter 21) extendedly arranged in the radial outward direction of the central shaft 31, a rotary shaft 33 rotatably arranged to the main blade member 211 around the moving center line P parallel to the fixed center line O, a sub-blade member 221 (a sub-excavation cutter 22) extending in the radial outward direction of the rotary shaft 33 and arranged in a mode of changing a projecting dimension from the tip of the main blade member 211 in response to rotation of the rotary shaft 33, a driving part rotatingly driving the central shaft 31, and a rotation transmitting mechanism 34 transmitting rotation of the central shaft 31 as rotation of the rotary shaft 33 in the same direction as the central shaft 31. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a rotation mechanism that forms circular and non-circular trajectories at the same center, and an excavator that excavates the ground using the rotation mechanism.

  A general excavator is known in which a cutter head is rotated by a rotating mechanism and the ground is excavated by the cutter head. Such an excavator inevitably has a circular cross-section because the cutter head rotates about a predetermined center. However, in tunnel use spaces such as railways and roads, the required cross-sectional shape is often non-circular, and a non-circular railway or road space is constructed within the circular excavation cross-section. . For this reason, since excavation more than utilization space is performed, in addition to requiring a lot of land area, there exists a problem that construction cost increases.

  2. Description of the Related Art Conventionally, for example, there is a square drilling device for forming a square hole in a workpiece by providing a cutting tool on a Rouleau triangle rotating body such as a Rouleau triangle and rotating the Rouleau triangle rotating body (for example, patents) Reference 1).

  In addition, there is an excavator in which a machining member is attached to a machining member rotation support device so as to be rotatable about its center, and the machining member rotation support device is attached to the machining member revolution support device. The processed member is provided with an excavation working surface by providing excavation blades at the apexes of substantially equilateral triangles concentric with the center and inward thereof. The processed member rotation support device is attached to the processed member revolving support device so that the center rotates at a radius ((1/2) / cos30 ° − (1/2)) times one side of the equilateral triangle. is there. And the drive means which revolves 3 times in the direction opposite to the rotation direction while rotating a process member is provided (for example, refer patent document 2).

  In addition, a circular arc centered on each vertex of the regular triangle and having the length of one side as a radius is drawn on the outside of each opposite side, and a cutter having an outline of a Rouleau triangle surrounded by these three circular arcs is defined as a rectangle. There is a rectangular shield method in which excavation is performed by rotating while revolving around the central axis of the shape skin plate. The eccentric distance of the rotation axis of the cutter with respect to the center axis of the skin plate is set so as to satisfy (L / 2) / cos 30 ° − (L / 2) (L: distance between vertices of the Rouleau triangle). The revolution number of the cutter is three times the revolution number, and the revolution direction and the revolution direction are opposite directions (see, for example, Patent Document 3).

  Furthermore, there is a free section shield method in which a main cutter excavates a circular center part of an excavation section and a plurality of planetary cutters excavate an outer peripheral part thereof. The planetary cutter revolves while rotating around the outer periphery of the main cutter as the main cutter rotates. This revolution trajectory can be arbitrarily changed by adjusting the angle of the swing arm provided with the planetary cutter. As a result, various excavation cross-sectional shapes, such as a rectangle, an ellipse, a horseshoe shape, and an egg shape, can be selected at the same center (for example, refer nonpatent literature 1).

JP-A-11-267950 JP-A-1-158196 Japanese Patent No. 2926125 Shield Construction Method Association, “Free Section Shield Construction Method”, [online], searched on September 16, 2005, Internet <URL: http://www.shield-method.gr.jp/pdf_data/jiyu.pdf>

  By the way, when digging into a non-circular, substantially rectangular shape using the rouleau triangle, it is necessary to rotate the rouleau triangle around its center of gravity and revolve the lureau triangle center of gravity around the center of the square. There is.

  In the invention of Patent Document 1, a shaft for transmitting the torque of the motor and a shaft at the center of gravity of the Rouleau triangle rotating body are connected by a universal joint. However, in this configuration, rotational vibration and vibration are generated in the drive transmission system, and in an excavator that requires a larger torque, the universal joint is expensive and the manufacturing cost increases.

  In the invention of Patent Document 2, a revolution device is configured by transmitting torque from a motor to a machining member by a crankshaft. However, cranking causes shearing force and bending moment to the rotating shaft member, which causes rotational vibration and vibration.

  In the invention of Patent Document 3, a revolution drive board is provided at the center of a rectangular skin plate, and a cutter rotation shaft is provided on the revolution drive board. A motor for rotating the revolution drive board and a motor for rotating the cutter rotating shaft are provided. However, since the motor for rotating the cutter rotating shaft is provided on the revolution drive board, it is necessary to design the wiring and pipes after careful examination. Furthermore, it is necessary to synchronize by adjusting the rotation speed and rotation direction of each motor. As a result, the design cost increases.

  As described above, although there is an application for a rotation mechanism that uses the principle of the Rouleau triangle to form a substantially rectangular locus, none of them realizes rational driving. Further, in excavators that require a large torque, a square frame requires a large space in the excavation hole, so a mechanism without a square frame is desired. Furthermore, there is no realization of a rotating mechanism that forms a polygonal locus including a rectangular shape and an excavator using the rotating mechanism, not limited to rectangular excavation.

  In addition, the method of Non-Patent Document 1 corresponds to rectangular or elliptical excavation, but in order to obtain a plurality of planetary cutters that revolve while rotating around the outer periphery of the main cutter as the main cutter rotates, It has a complicated structure using an arm. As a result, there is a problem that the manufacturing cost increases.

  In view of the above circumstances, the present invention reduces the rotational shake and vibration of the drive system, and at a low cost, forms a circular and non-circular locus at the same center, and uses the rotation mechanism to achieve the same center. An object of the present invention is to provide an excavator capable of continuously excavating circular and non-circular cross sections.

  In order to achieve the above object, a rotating mechanism according to claim 1 of the present invention includes a central axis that is rotatable about a predetermined fixed center line, and extends radially outward from the central axis. A main blade member provided, a rotation shaft provided rotatably with respect to the main blade member about a moving center line parallel to the fixed center line, and the rotation extending in a radially outward direction of the rotation shaft A sub-blade member provided in such a manner that the projecting dimension from the tip of the main blade member changes with the rotation of the shaft, a drive unit that rotationally drives the central shaft, and one rotation of the central shaft is a predetermined of the rotational shaft. And a rotation transmission mechanism that transmits the rotation.

  The rotating mechanism according to a second aspect of the present invention is the rotating mechanism according to the first aspect, wherein the rotation transmitting mechanism has a circular outer periphery centered on the moving center line and is provided on the rotating shaft. And a second engaging portion having a circular outer periphery centered on the fixed center line and fixedly inserted by rotating the central axis, and an outer peripheral portion of the first engaging portion. And driving to rotate the sub blade member twice in the same direction with respect to one rotation of the main blade member while engaging the outer periphery of the second engaging portion and transmitting the rotation of the central shaft as the rotation of the rotation shaft. It is characterized by comprising a transmission part.

  A rotating mechanism according to a third aspect of the present invention is the rotating mechanism according to the first or second aspect, wherein the sub blade member has a circular outline, and a position shifted from the center by a predetermined amount of eccentricity is on the moving center line. It is characterized by being placed as a center of rotation.

  An excavator according to a fourth aspect of the present invention uses the rotation mechanism according to any one of the first to third aspects to support the second engaging portion and arrange the driving portion therein. It has a cylindrical body, a main excavation cutter in which a cutter is disposed on the main blade member, and a sub excavation cutter in which a cutter is disposed on the sub blade member.

  According to the present invention, by transmitting the driving force of the driving unit to the central axis, the central axis rotates about the fixed center line. For this reason, the main blade member provided on the central axis rotates around the fixed center line. Further, the rotation of the center axis is transmitted to the rotation axis by the drive transmission unit, whereby the rotation axis rotates about the movement center line. For this reason, the sub blade member provided on the rotation shaft rotates (rotates) around the movement center line. That is, the main blade member is driven to rotate around the fixed center line to form a circular locus, and the secondary blade member revolving around the fixed center line rotates to form a circular shape outside the main blade member. Make a trajectory to expand the excavation section. As a result, it is possible to obtain a non-circular locus in which the circular shape is expanded by a simple mechanism with a small burden on the sub blade member. Further, the drive system for the main blade member is a conventional rotation mechanism, and the auxiliary blade member drive system is supplementarily added to this rotation mechanism, so that a low-cost and highly reliable rotation mechanism can be obtained. it can. And if it is set as the excavator provided with the excavation cutter which provided the cutter in each blade member, the excavation hole of the non-circular excavation cross section which expanded the circular shape can be excavated. Compared with a general circular excavation hole, this excavation hole can be obtained by excavating only the use space without excavating unnecessary space, so it does not require more land area than necessary. In addition, construction costs can be reduced.

  Further, the rotation transmission mechanism causes the sub blade member to rotate twice in the same direction (rotation) with respect to one rotation of the main blade member, so that the sub blade member forms an oval locus centering on the fixed center line. . As a result, it is possible to excavate an excavation hole having an elliptical excavation cross section.

  That is, according to the present invention, the main blade member is driven to rotate around the fixed center line to form a circular locus, and the sub blade member revolving around the fixed center line rotates to rotate outside the main blade member. It consists of a rotating mechanism that forms a trajectory that extends the circular excavation cross section. As a result, it is possible to dig a non-circular excavation section such as an ellipse by a simple mechanism with a small burden on the sub blade member. In addition, the drive system of the main blade member is a conventional rotation mechanism, and the auxiliary blade member drive system is supplementarily added to this rotation mechanism, so that a low-cost and highly reliable rotation mechanism and excavator can be provided. Obtainable.

  Furthermore, since the main blade member is driven to rotate around the fixed center line, and the sub blade member is driven to revolve around the fixed center line, rotation by the rotation transmission mechanism that is the drive system of the sub blade member. The sub-blade member is driven by performing transmission to excavate a non-circular excavation section such as an ellipse, while the circular excavation section is excavated by cutting off the rotation transmission by the rotation transmission mechanism. Can be switched as follows. As a result, for example, one excavator excavates a circular excavation section of a railway tunnel, followed by an excavation of a non-circular excavation section such as an ellipse of a station platform tunnel, and further It is possible to continuously excavate tunnels with different cross-sectional shapes, such as excavation of circular excavation cross sections of railway tunnels, and to align all of the cross-sectional centers with the fixed center line.

  In addition, the main blade member is configured to extend radially outward from the central axis, so that the area of the cutter head that corresponds to the excavation surface does not become excessive, so a sufficient opening area for taking the excavated soil into the trunk is secured. can do.

  In addition, since the central axis rotates on the fixed center line without shifting its axis, excavation in which a circular drill such as a lock auger is provided at the tip of the central axis extending further forward can be used in combination. As a result, rock drilling can be performed prior to excavation, and the load on the main excavation cutter and the sub excavation cutter can be reduced.

  Further, since the central axis rotates on the fixed center line without shifting its axis, it is possible to reduce rotational shake and vibration. Furthermore, since a conventional universal joint is not required for transmission of rotation between the central axis and the rotation axis, the cost associated with the universal joint can be reduced. The rotation mechanism is a rotation mechanism that rotationally drives the main blade member around the fixed center line and revolves the sub blade member around the fixed center line. Therefore, the manufacturing cost can be reduced without using a complicated configuration using a swing arm as before. In other words, the rotating mechanism (excavator) is a simple mechanism that digs an excavation hole having a non-circular excavation cross section such as an ellipse, so that failure is unlikely to occur and reliability is high, and costs can be reduced. .

  Exemplary embodiments of a rotating mechanism and an excavator according to the present invention will be described below in detail with reference to the accompanying drawings.

[Embodiment 1]
FIG. 1 is a schematic side sectional view showing Embodiment 1 of an excavator using a rotating mechanism according to the present invention, FIG. 2 is a conceptual diagram of the excavator shown in FIG. 1 viewed from the axial direction (forward direction), and FIG. FIG. 3 is a partially enlarged view of FIG. 2.

  As shown in FIGS. 1 and 2, the excavator includes a trunk portion 1 and excavation cutters 21 and 22. The body portion 1 supports the excavation cutter, and has a rotating mechanism 3 that rotates the excavation cutters 21 and 22 inside a cylindrical shape that forms an outer shell of the excavator.

  The rotation mechanism 3 includes a center shaft 31, a drive unit 32, a rotation shaft 33, a rotation transmission mechanism 34, a main blade member 211, and a sub blade member 221.

  The central shaft 31 is supported so as to be rotatable about a predetermined fixed center line O arranged along the front-rear direction of the body portion 1. The center shaft 31 is provided with a front end extending in front of the body portion 1, and a main blade member 211 is provided at the front end.

  The main blade member 211 is provided on the front outer side of the trunk portion 1 so as to extend perpendicularly to the fixed center line O in the radially outward direction of the central shaft 31. As shown in FIG. 2, the main blade member 211 is formed in a cross shape by combining two one-letter shapes extending in the opposite direction from the fixed center line O with the same length. The main blade member 211 constitutes the main excavation cutter 21.

  The drive unit 32 rotates the central shaft 31 and includes a drive source provided in the body 1 such as a motor. The drive unit 32 has an output shaft disposed on the fixed center line O, and the output shaft is connected to the center shaft 31. The drive unit 32 may have a speed reduction mechanism as appropriate between the drive source and the central shaft 31 although not shown in the figure.

  The rotation shaft 33 is provided so as to be rotatable with respect to the main blade member 211 around a movement center line P parallel to the fixed center line O. The rotating shaft 33 is disposed so as to penetrate the main blade member 211, and a sub blade member 221 is provided at the front end that extends forward of the body portion 1. As shown in FIG. 2, two rotation shafts 33 are provided at each end portion of the single-letter-shaped main blade member 211 extending in the opposite direction from the fixed center line O.

  The sub blade member 221 is provided so as to be orthogonal to the movement center line P and extend in the radially outward direction of the rotation shaft 33. As shown in FIG. 2, the sub blade member 221 is formed in a disc-like (circular) outline centered on the center G, and a position shifted from the center G by a predetermined eccentricity r on the movement center line P. Is provided on the rotary shaft 33. For this reason, the sub blade member 221 rotates and moves as the protrusion dimension from the tip of the main blade member 211 changes with the rotation of the rotating shaft 33. The sub blade member 221 constitutes the sub excavation cutter 22.

  The rotation transmission mechanism 34 includes a first engagement portion 341, a second engagement portion 342, and a drive transmission portion 344. The first engagement portion 341 has a disc-like shape having an outer peripheral portion 341a centered on the movement center line P, and the rear end of each rotation shaft 33 so as to rotate around the movement center line P. Are fixed to each. The second engaging portion 342 has an outer peripheral portion 342 a centered on the fixed center line O, and is fixed to the trunk portion 1 by rotatably inserting the central shaft 31.

  The drive transmission portion 344 engages with the outer peripheral portion 341 a of the first engagement portion 341 and the outer peripheral portion 342 a of the second engagement portion 342 and transmits the rotation of the central shaft 31 as the rotation of the rotation shaft 33. The drive transmission unit 344 includes a rotation shaft 344A, a third engagement unit 344B, a fourth engagement unit 344C, and a transmission member 344D. The rotation shaft 344A is rotatably provided on the main blade member 211 about a center line S parallel to the fixed center line O and the movement center line P. The rotating shaft 344 </ b> A is provided with a rear end penetrating the main blade member 211 extending behind the main blade member 211. As shown in FIG. 2, two rotation shafts 344 </ b> A are provided on a single letter-shaped main blade member 211 extending in a direction opposite to the fixed center line O. The third engaging portion 344B has an outer peripheral portion 344Ba with the center line S as the center and is formed in a disk shape, and is arranged at the rear end of each rotation shaft 344A so as to rotate around the center line S. It is fixed. The third engaging portion 344B engages the outer peripheral portion 344Ba with the outer peripheral portion 342a of the second engaging portion 342 (for example, engagement by gear meshing). The fourth engagement portion 344C has an outer peripheral portion 344Ca centered on the center line S and is formed in a disk shape, and rotates together with the third engagement portion 344B so as to rotate about the center line S. The shafts 344A are respectively fixed to the rear ends. The transmission member 344D is an endless member that hangs around and engages with the outer peripheral portion 341a of the first engaging portion 341 and the outer peripheral portion 344Ca of the fourth engaging portion 344C. The rotation transmission mechanism 34 according to the first embodiment includes an outer peripheral portion 341a of the first engaging portion 341 and an outer peripheral portion 344Ca of the fourth engaging portion 344C as sprockets, and includes an endless member configured as a chain on the sprocket. The transmission member 344D is engaged. Further, the engagement between the outer peripheral portion 342a of the second engaging portion 342 and the outer peripheral portion 344Ba of the third engaging portion 344B may be an engagement by meshing of gears. The outer peripheral portion 341a of the first engaging portion 341, the outer peripheral portion 342a of the second engaging portion 342, the outer peripheral portion 344Ba of the third engaging portion 344B, the outer peripheral portion 344Ca of the fourth engaging portion 344C, and the transmission member 344D. The engagement may be an engagement in which contact slippage is prevented via a high friction material or the like.

  The main excavation cutter 21 is configured by providing an excavation bit (not shown) in front of the main blade member 211 provided at the front end of the central shaft 31. Further, the excavation cutter is configured by providing an excavation bit (not shown) on the front surface of the sub blade member 221 provided at the front end of the rotating shaft 33.

  Here, the dimension setting which concerns on the rotation mechanism 3 is demonstrated. As shown in FIGS. 2 and 3, the radius of the sub blade member 221 is b, and the distance r from the center G of the sub blade member 221 to the center of the rotation shaft 33 (moving center line P) is set to r ≦ b. . And the diameter D of the outer peripheral part 341a of the 1st engaging part 341 is set to D <= 2 (br), and the diameter of the outer peripheral part 342a of the 2nd engaging part 342 is set to 4D. Furthermore, the diameter of the outer peripheral portion 344Ba of the third engaging portion 344B is set to 2D, and the diameter of the outer peripheral portion 344Ca of the fourth engaging portion 344C is set to D as in the first engaging portion 341. That is, by providing the drive transmission portion 344 that engages with the outer peripheral portion 341a of the first engaging portion 341 and the outer peripheral portion 342a of the second engaging portion 342, the outer peripheral portion 341a of the first engaging portion 341 becomes the sub-blade member. The driving condition for rotating the sub blade member 221 twice in the same direction (spinning) with respect to one rotation of the main blade member 211 without projecting outside the outline of 221 is satisfied.

  The excavator having the above configuration transmits the driving force of the driving unit 32 to the central axis 31 in the rotation mechanism 3, so that the central axis 31 rotates around the fixed center line O (for example, clockwise in FIG. 2). At this time, the main blade member 211 (main excavation cutter 21) provided on the central shaft 31 rotates (for example, clockwise in FIG. 2) about the fixed center line O. Further, the rotation of the center shaft 31 is transmitted to the rotation shaft 33 by the drive transmission unit 344, whereby the rotation shaft 33 rotates around the movement center line P (for example, clockwise in FIG. 2). For this reason, the sub blade member 221 (sub excavation cutter 22) provided on the rotating shaft 33 rotates around the movement center line P (for example, clockwise in FIG. 2). At this time, the rotation transmission mechanism 34 described above causes the sub-blade member 221 to rotate (rotate) twice in the same direction with respect to one rotation of the main blade member 211. This corresponds to the sub blade member 221 rotating three times in the same direction with respect to one rotation of the main blade member 211 in the absolute coordinate system fixed to the excavator.

  Specifically, as shown in FIG. 2, the sub blade member 221 is the position most retracted from the tip of the main blade member 211, and the center G of the sub blade member 221 and the movement center line P from the fixed center line O They are positioned so as to be aligned on a straight line orthogonal to the long side of the desired oval locus in order. From this state, the main blade member 211 is rotated clockwise about the fixed center line O. At this time, the main blade member 211 forms a circular trajectory centered on the fixed center line O as indicated by a two-dot chain line.

  On the other hand, when the main blade member 211 is rotated once counterclockwise around the fixed center line O, the sub blade member 221 moves the movement center line P with respect to the extending direction of the main blade member 211 from the fixed center O. 2 turns in the same direction around the center. That is, in the process in which the main blade member 211 is rotated 45 ° clockwise as shown in FIGS. 2 and 4, the sub blade member 221 is rotated 90 ° clockwise and starts to advance from the tip of the main blade member 211. Next, in the process in which the main blade member 211 is further rotated 45 ° clockwise from FIG. 4 to FIG. 5, the sub blade member 221 is further rotated 90 ° clockwise, and has advanced most from the tip of the main blade member 211. The center G of the sub blade member 221 is positioned on a straight line connecting the fixed center line O and the movement center line P. Next, in the process in which the main blade member 211 further rotates 45 ° clockwise from FIG. 5 to FIG. 6, the sub blade member 221 further rotates 90 ° clockwise and starts to retract from the tip of the main blade member 211. . Next, in the process in which the main blade member 211 further rotates 45 ° clockwise from FIG. 6 to FIG. 7, the sub blade member 221 further rotates 90 ° clockwise and retracts most from the tip of the main blade member 211. The center G of the sub blade member 221 is positioned on a straight line connecting the fixed center line O and the movement center line P. Here, when the main blade member 211 rotates 180 ° clockwise, the sub blade member 221 rotates 360 ° clockwise. Then, in the process in which the main blade member 211 is further rotated 180 ° clockwise from FIG. 4 to FIG. 7 as described above, the sub blade member 221 is rotated 360 ° clockwise. Thus, the sub-blade member 221 bulges in the left-right direction around the fixed center line O as shown in FIG. 7 by rotating twice in the same direction with respect to one rotation of the main blade member 211. Make a circular trajectory. As a result, by propelling the excavator forward (see FIG. 1), it becomes possible to excavate an excavation hole H having an elliptical excavation cross section as shown in FIG.

  The principle of the Reuleaux triangle is used as the principle configuration for obtaining an elliptical locus. That is, as shown in FIG. 8, while the main blade member 211 rotates by φ / 3 around the fixed center line O (coordinates 0, 0) as viewed from the excavator, the sub blade member 221 moves the movement center line P. The center is rotated once in the same direction as the main blade member 211 by φ. At this time, the coordinates of the center G of the sub blade member 221 that is a distance (eccentricity) r away from the moving center line P are an absolute coordinate system in which the horizontal axis is the X coordinate and the vertical axis is the Y coordinate. The rotation angle of the main blade member 211 from the position aligned on the straight line in this order is obtained by the following equations 1 and 2 with φ / 3 as the rotation angle. From the geometrical conditions of the Rouleau triangle, the short side length of the oval locus formed by the center G of the sub blade member 221 is defined as a ′ (note that the long side length is a ′ + 4r), and the amount of eccentricity is as shown in the following equation 3. r = 0.0774a ′ is obtained. This eccentric amount r is preferably an oval locus with a short side length of a and a range of 0.05a to 0.065a, and if it is larger than this range, the central part of the short side of the oval becomes a concave shape inside. If it is made smaller, it can be adjusted to approach a circular locus.

  Here, the sub blade member 221 having a radius b with the center G as the center is set. The radius b is not less than the eccentric amount r (r ≦ b), and the sub blade member 221 is prevented from protruding so much from the tip of the main blade member 211. When there is a movement center line P at the tip of the main blade member 211, b = r, but the dimension for providing the rotating shaft 33 is required, so the dimension to be implemented is b> r. In consideration of the dimensions for providing the rotating shaft 33 on the main blade member 211, the length (extending length from the fixed center line O) L of the main blade member 211 is L = 0.5a + b.

  For example, in FIG. 8, the unit is m (meter). Here, an oblong short side length a ′ = 4 m serving as a locus of the center G of the sub blade member 221 (shown by a broken line in FIG. 8), an eccentricity r = 0.075 × a ′ = 0.3 m, The radius b of the sub blade member 221 is 0.5 m and the length L of the main blade member 211 is 0.5 a ′ + b = 2.5 m (2.3 m to the moving center line P that is the joining axis of the sub blade member 221) ), The short side length “a” + 2b = 5 m and the long side length of the long circular excavation section to be excavated are a ′ + 4r + 2b = 6.2 m. In other words, in the absolute coordinate system shown in FIG. 8, the left and right sides of the circular trajectory of the main blade member 211 centered on the fixed center line O are rotated in the same direction as the main blade member 211 at a triple speed. It can be seen that the blade member 221 excavates. In the coordinate system (moving coordinate system) in which the sub blade member 221 is attached to the main blade member 211, the sub blade member 221 rotates twice (rotates) in the same direction while the main blade member 211 rotates once. It corresponds to.

  As described above, the rotation mechanism 3 (excavator) in the first embodiment described above extends in the radially outward direction of the center shaft 31 provided to be rotatable about a predetermined fixed center line O and the center shaft 31. The main blade member 211 (the main excavation cutter 21) provided, the rotating shaft 33 provided to be rotatable with respect to the main blade member 211 around the moving center line P parallel to the fixed center line O, The auxiliary blade member 221 (sub-excavation cutter 22) provided in such a manner that the protrusion dimension from the tip of the main blade member 211 changes along with the rotation of the rotary shaft 33 extending in the radial direction, and the central shaft 31 is driven to rotate. And a rotation transmission mechanism 34 that transmits one rotation of the central shaft 31 as two rotations of the rotation shaft 33 in the same direction.

  Then, by transmitting the driving force of the driving unit 32 to the central axis 31, the central axis 31 rotates around the fixed center line O. For this reason, the main blade member 211 provided on the central shaft 31 rotates around the fixed center line O. Further, the rotation of the central shaft 31 is transmitted to the rotational shaft 33 by the drive transmission unit 344, so that the rotational shaft 33 rotates in the same direction as the central shaft 31 around the movement center line P. For this reason, the sub blade member 221 provided on the rotation shaft 33 rotates in the same direction as the main blade member 211 around the movement center line P. At this time, the rotation transmission mechanism 34 rotates the sub blade member 221 twice in the same direction for one rotation of the main blade member 211. For this reason, the main blade member 211 forms a circular locus centering on the fixed center line O, and the sub blade member 221 forms an oval locus centering on the fixed center line O. As a result, the excavation hole H having an elliptical excavation cross section can be excavated. In the first embodiment described above, a horizontally long oval locus is obtained. However, by shifting the phase by 90 ° in the configuration of the rotation mechanism 3, a vertically long oval locus is obtained.

  That is, the main blade member 211 is driven to rotate around the fixed center line O to excavate a circular excavation section, and the sub blade member 221 revolving around the fixed center line O rotates to rotate the main blade. The rotating mechanism is configured to excavate an elliptical excavation cross section so as to expand the circular excavation cross section outside the member 211. As a result, it becomes possible to perform the oval excavation by a simple mechanism with a small burden on the sub blade member 221. The drive system for the main blade member 211 is a conventional rotation mechanism, and the drive system for the auxiliary blade member 221 is supplementarily added to the rotation mechanism. It is possible to get a chance.

  Further, since the auxiliary blade member 221 rotates around the fixed center line O and the secondary blade member 221 revolving around the fixed center line O rotates, the drive system of the auxiliary blade member 221 The sub-blade member 221 is driven by exchanging rotation by a certain rotation transmission mechanism 34 to excavate an elliptical excavation section, while the circular excavation section is cut by interrupting transmission of rotation by the rotation transmission mechanism 34. It is possible to switch to drilling. As a result, for example, one excavator excavates the circular excavation section of the railway tunnel, then excavates the widened elliptical excavation section of the station platform tunnel, and then continues to the railway tunnel. Thus, a tunnel having a different cross-sectional shape can be continuously excavated, such as excavation of a circular excavation section, and the center of the cross-section can be aligned with the fixed center line O.

  Further, by adjusting the phase angle of the sub blade member 221 with respect to the main blade member 211, the long side of the oval shape (major axis direction) can be freely set, for example, a horizontally long oval shape or a vertically long oval shape. The excavation section can be excavated. Here, the phase angle refers to the main blade member 211 and the sub blade member 221 with respect to the vector from the rotation axis 33 (movement center line P) that joins the main blade member 211 and the sub blade member 221 to the fixed center line O. Is a rotation angle of a vector from the rotation shaft 33 (movement center line P) to the center G of the sub blade member 221, and a direction in which the rotation angle is 0 is a short side direction of an oval shape.

  Further, since the main blade member 211 is arranged in a cross shape, the area of the cutter head corresponding to the excavation surface does not become excessive, so that a sufficient opening area for taking the excavated soil into the trunk portion 1 can be secured. it can.

  Further, since the center axis 31 rotates on the fixed center line O without shifting its axis, excavation provided with a circular drill such as a lock auger at the front end of the center axis 31 extended further forward can be used together. it can. As a result, rock drilling can be performed prior to excavation, and the load on the main excavation cutter 21 and the sub excavation cutter 22 can be reduced.

  The rotating mechanism 3 is configured to rotate the main blade member 211 around the fixed center line O and to rotate the sub blade member 221 around the moving center line P with respect to the main blade member 211. is there. For this reason, it is not necessary to support and rotate the axis | shaft of a Rouleau triangle on the frame which makes the movement locus | trajectory of a Rouleau triangle an inner surface like the casing in a rotary engine. That is, a frame is not necessary. For this reason, it becomes possible to form the outline of the body part 1 of an excavator small in front view with respect to the cross-sectional shape of the excavated drill hole H. As a result, since the trunk portion 1 can pass through the excavation hole H that the excavation cutter has excavated in advance, it is possible to obtain an excavator that excavates the excavation hole H having an elliptical excavation cross section. Furthermore, since the center axis 31 rotates on the fixed center line O without shifting its axis, it is possible to reduce rotational shake and vibration. In addition, since it is not necessary to use a universal joint prior to transmission of rotation between the central shaft 31 and the rotary shaft 33, it is possible to reduce the cost of the universal joint. The rotation mechanism 3 is a rotation mechanism that rotationally drives the main blade member 211 about the fixed center line O and revolves the sub blade member 221 about the fixed center line O. For this reason, it is possible to reduce the manufacturing cost without using a complicated configuration using a swing arm as before. That is, the rotating mechanism 3 (excavator) excavates the excavation hole H having an elliptical excavation cross section with a simple mechanism, so that failure is unlikely to occur and the reliability is high, and the cost can be reduced.

  Further, since the main blade member 211 and the sub blade member 221 rotate in the same direction, it is possible to use a cutter bit having a shape specified in the cutting direction. As a result, the change in the cutting direction of the cutter bit is small, and the cutter bit can be stably moved in the long side direction widened portion of the oval shape where the excavation with the sub blade member 221 (sub excavation cutter 22) is particularly large.

[Embodiment 2]
9 is a schematic sectional side view showing a second embodiment of an excavator using a rotating mechanism according to the present invention, FIG. 10 is a conceptual diagram of the excavator shown in FIG. 9 viewed from the axial direction (forward direction), and FIG. FIG. 11 is a partially enlarged view of FIG. 10. Note that, in the second embodiment described below, the same parts as those in the first embodiment described above are denoted by the same reference numerals and description thereof is omitted.

  In the excavator in the second embodiment, the configuration of the rotation transmission mechanism 34 is different with respect to the rotation mechanism 3. The rotation transmission mechanism 34 includes a first engagement portion 341, a second engagement portion 342, and a drive transmission portion 343. The first engagement portion 341 has a disc-like shape having an outer peripheral portion 341a centered on the movement center line P, and the rear end of each rotation shaft 33 so as to rotate around the movement center line P. Are fixed to each. The second engaging portion 342 has an outer peripheral portion 342 a centered on the fixed center line O, and is fixed to the trunk portion 1 by rotatably inserting the central shaft 31. The drive transmission portion 343 engages with the outer peripheral portion 341 a of the first engagement portion 341 and the outer peripheral portion 342 a of the second engagement portion 342 and transmits the rotation of the central shaft 31 as the rotation of the rotation shaft 33. The drive transmission portion 343 has outer peripheries 341 a of the first engaging portion 341 and outer peripheries of the second engaging portion 342 so that the sub blade member 221 rotates four times in the reverse direction with respect to one rotation of the main blade member 211. It consists of an endless member which hangs around and engages with the part 342a. The rotation transmission mechanism 34 according to the second embodiment includes an endless member in which the outer peripheral portion 341a of the first engaging portion 341 and the outer peripheral portion 342a of the second engaging portion 342 are configured as sprockets and the sprocket is configured as a chain. The drive transmission unit 343 is engaged. In addition, the engagement of the outer peripheral portion 341a of the first engaging portion 341, the outer peripheral portion 342a of the second engaging portion 342, and the drive transmission portion 343 formed of an endless member prevents contact slip through a high friction material or the like. May be engaged.

  Here, the dimension setting which concerns on the rotation mechanism 3 is demonstrated. As shown in FIGS. 10 and 11, the radius of the sub blade member 221 is b, and the distance r from the center G of the sub blade member 221 to the center of the rotating shaft 33 (moving center line P) is set to r ≦ b. . And the diameter D of the outer peripheral part 341a of the 1st engaging part 341 is set to D <= 2 (br), and the diameter of the outer peripheral part 342a of the 2nd engaging part 342 is set to 4D. That is, by providing a drive transmission portion 343 of an endless member that is wound around and engaged with the outer peripheral portion 341a of the first engaging portion 341 and the outer peripheral portion 342a of the second engaging portion 342, the first engaging portion 341 The driving condition for rotating the sub blade member 221 four times in the reverse direction (spinning) with respect to one rotation of the main blade member 211 is satisfied without the outer peripheral portion 341a protruding outside the outline of the sub blade member 221.

  The excavator having the above-described configuration transmits the driving force of the driving unit 32 to the central axis 31 in the rotation mechanism 3 so that the central axis 31 rotates around the fixed center line O (for example, counterclockwise in FIG. 10). . For this reason, the main blade member 211 (main excavation cutter 21) provided on the center shaft 31 rotates around the fixed center line O (for example, counterclockwise in FIG. 10). Further, the rotation of the central shaft 31 is transmitted to the rotational shaft 33 by the drive transmission unit 343, so that the rotational shaft 33 rotates about the movement center line P (for example, clockwise in FIG. 10). For this reason, the sub blade member 221 (sub excavation cutter 22) provided on the rotating shaft 33 rotates around the movement center line P (for example, in the clockwise direction in FIG. 10). At this time, the rotation transmission mechanism 34 described above causes the sub blade member 221 to rotate four times in the reverse direction (rotation) with respect to one rotation of the main blade member 211. This corresponds to the sub blade member 221 rotating three times in the opposite direction with respect to one rotation of the main blade member 211 in the absolute coordinate system fixed to the excavator.

  Specifically, as shown in FIG. 10, the sub blade member 221 is the position most retracted from the tip of the main blade member 211, and the center G of the sub blade member 221 and the movement center line P from the fixed center line O. They are positioned so as to be arranged on a straight line orthogonal to one side of a desired substantially square locus in order. From this state, the main blade member 211 is rotated counterclockwise once around the fixed center line O. At this time, the main blade member 211 forms a circular trajectory centered on the fixed center line O as indicated by a two-dot chain line.

  On the other hand, when the main blade member 211 is rotated once counterclockwise about the fixed center line O, the sub blade member 221 moves in the moving center line with respect to the extending direction of the main blade member 211 from the fixed center line O. 4 turns in the opposite direction around P. That is, in the process in which the main blade member 211 is rotated 45 ° counterclockwise until reaching the FIGS. 10, 12 and 13, the sub blade member 221 rotates 180 ° clockwise and advances most from the tip of the main blade member 211. The center G of the sub blade member 221 is located on a straight line connecting the fixed center line O and the movement center line P. Next, in the process in which the main blade member 211 is further rotated 45 ° counterclockwise from FIG. 13 to FIG. 15, the sub blade member 221 is further rotated 180 ° clockwise and retreats most from the tip of the main blade member 211. The center G of the sub blade member 221 is located on a straight line connecting the fixed center line O and the movement center line P. Next, in the process in which the main blade member 211 further rotates 45 ° counterclockwise from FIG. 15 to FIG. 17, the sub blade member 221 further rotates 180 ° clockwise and advances most from the tip of the main blade member 211. The center G of the sub blade member 221 is located on a straight line connecting the fixed center line O and the movement center line P. Finally, in the process in which the main blade member 211 is further rotated 45 ° counterclockwise from FIG. 17 to FIG. 19, the sub blade member 221 is further rotated 180 ° clockwise and the most from the tip of the main blade member 211 The center G of the sub blade member 221 is located on a straight line connecting the fixed center line O and the movement center line P. In this way, the sub blade member 221 is rotated four times in the opposite direction to one rotation of the main blade member 211, so that the corner portion has an arc shape around the fixed center line O as shown in FIG. It has a substantially square trajectory. As a result, by propelling the excavator forward (see FIG. 9), it becomes possible to excavate the excavation hole H having a substantially square excavation cross-section with an arcuate corner as shown in FIG.

  The principle of the Reuleau triangle is used as the principle configuration for obtaining a substantially square locus. That is, as shown in FIG. 20, while the main blade member 211 is rotated by φ / 3 around the fixed center line O (coordinates 0, 0) as viewed from the excavator, the sub blade member 221 is moved along the moving center line P. Is rotated once in the opposite direction to the main blade member 211 by φ. At this time, the coordinates of the center G of the sub blade member 221 that is a distance (eccentricity) r away from the moving center line P are an absolute coordinate system in which the horizontal axis is the X coordinate and the vertical axis is the Y coordinate. The rotation angle of the main blade member 211 from the position aligned on the straight line in this order is obtained by the following formulas 4 and 5 with φ / 3. From the geometrical conditions of the Rouleau triangle, as shown in FIG. 10, the side length of the substantially square locus formed by the center G of the sub blade member 221 is a ′, and the eccentricity r = 0.0774a as shown in the above equation 3. ' The amount of eccentricity r is preferably in the range of 0.05a to 0.065a, where a is the long side of the substantially square-shaped trajectory. Then, it is possible to adjust so that it may approach a circular locus.

  Here, the sub blade member 221 having a radius b with the center G as the center is set. The radius b is not less than the eccentric amount r (r ≦ b), and the sub blade member 221 is prevented from protruding so much from the tip of the main blade member 211. When there is a movement center line P at the tip of the main blade member 211, b = r, but the dimension for providing the rotating shaft 33 is required, so the dimension to be implemented is b> r. In consideration of the dimensions for providing the rotation shaft 33 on the main blade member 211, the length (extending length from the fixed center line O) L of the main blade member 211 is L = 0.5a '+ b.

  For example, in FIG. 20, the unit is m (meter). Here, the side length a ′ = 4 m of a substantially square shape serving as a locus of the center G of the sub blade member 221 (indicated by a broken line in FIG. 20), the amount of eccentricity r = 0.075 × a ′ = 0.3 m, The radius b of the blade member 221 is 0.5 m and the length L of the main blade member 211 is 0.5 a ′ + b = 2.5 m (2.3 m to the moving center line P that is the joining axis of the sub blade member 221). In this case, the side length a of the substantially square excavation section to be excavated is a ′ + 2b = 5 m. That is, in the absolute coordinate system shown in FIG. 20, the four corners of the circular trajectory of the main blade member 211 centered on the fixed center line O are sub-rotations rotating at a speed three times opposite to the main blade member 211. It can be seen that the blade member 221 excavates. This is because in the coordinate system (moving coordinate system) in which the sub blade member 221 is attached to the main blade member 211, the sub blade member 221 rotates four times in the reverse direction (rotation) while the main blade member 211 rotates once. It corresponds to.

  As described above, the rotation mechanism 3 (excavator) according to the second embodiment described above extends in the radially outward direction of the center shaft 31 provided rotatably around the predetermined fixed center line O. The main blade member 211 (the main excavation cutter 21) provided, the rotating shaft 33 provided to be rotatable with respect to the main blade member 211 around the moving center line P parallel to the fixed center line O, The auxiliary blade member 221 (sub-excavation cutter 22) provided in such a manner that the protrusion dimension from the tip of the main blade member 211 changes along with the rotation of the rotary shaft 33 extending in the radial direction, and the central shaft 31 is driven to rotate. And a rotation transmission mechanism 34 that transmits one rotation of the central shaft 31 as four rotations in the reverse direction of the rotation shaft 33.

  Then, by transmitting the driving force of the driving unit 32 to the central axis 31, the central axis 31 rotates around the fixed center line O. For this reason, the main blade member 211 provided on the central shaft 31 rotates around the fixed center line O. Further, the rotation of the central shaft 31 is transmitted to the rotational shaft 33 by the drive transmission unit 343, so that the rotational shaft 33 rotates in the direction opposite to the central shaft 31 around the movement center line P. For this reason, the sub blade member 221 provided on the rotating shaft 33 rotates in the direction opposite to the main blade member 211 around the movement center line P. At this time, the rotation transmission mechanism 34 rotates the sub blade member 221 four times in the reverse direction with respect to one rotation of the main blade member 211. For this reason, the main blade member 211 forms a circular locus centered on the fixed center line O, and the sub blade member 221 forms a substantially square locus centering on the fixed center line O. As a result, the excavation hole H having an approximately square excavation cross section can be excavated.

  That is, the main blade member 211 is driven to rotate around the fixed center line O to excavate a circular excavation section, and the sub blade member 221 revolving around the fixed center line O rotates to rotate the main blade. The rotation mechanism is configured to excavate a substantially square excavation cross section so as to expand the circular excavation cross section outside the member 211. As a result, it is possible to dig a substantially square shape by a simple mechanism that places a small burden on the sub blade member 221. The drive system for the main blade member 211 is a conventional rotation mechanism, and the drive system for the auxiliary blade member 221 is supplementarily added to the rotation mechanism. It is possible to get a chance.

  Further, since the auxiliary blade member 221 rotates around the fixed center line O and the secondary blade member 221 revolving around the fixed center line O rotates, the drive system of the auxiliary blade member 221 The sub blade member 221 is driven by transmitting rotation by a certain rotation transmission mechanism 34 to excavate a substantially square excavation section, while the circular transmission section by cutting off the rotation transmission by the rotation transmission mechanism 34. It is possible to switch to drilling. As a result, for example, a circular excavation section of the railway tunnel is excavated by one excavator, and then an approximately square excavation section of the tunnel for the station platform is excavated, and then the circular section of the railway tunnel is continued. It is possible to continuously excavate tunnels having different cross-sectional shapes, such as excavation of the excavation cross section having a shape, and the center of the cross-section can be aligned with the fixed center line O.

  Further, since the main blade member 211 is arranged in a cross shape, the area of the cutter head corresponding to the excavation surface does not become excessive, so that a sufficient opening area for taking the excavated soil into the trunk portion 1 can be secured. it can.

  Further, since the center axis 31 rotates on the fixed center line O without shifting its axis, excavation provided with a circular drill such as a lock auger at the front end of the center axis 31 extended further forward can be used together. it can. As a result, rock drilling can be performed prior to excavation, and the load on the main excavation cutter 21 and the sub excavation cutter 22 can be reduced.

  The rotating mechanism 3 is configured to rotate the main blade member 211 around the fixed center line O and to rotate the sub blade member 221 around the moving center line P with respect to the main blade member 211. is there. For this reason, it is not necessary to support and rotate the axis of the Rouleau triangle in a square frame having one side of the outer width of the Rouleau triangle so as to form a conventional approximately square locus. That is, a frame is not necessary. For this reason, it becomes possible to form the outline of the body part 1 of an excavator small in front view with respect to the cross-sectional shape of the excavated drill hole H. As a result, since the trunk portion 1 can pass through the excavation hole H that the excavation cutter has excavated in advance, an excavator that excavates the excavation hole H having an approximately square excavation cross section can be obtained. Furthermore, since the center axis 31 rotates on the fixed center line O without shifting its axis, it is possible to reduce rotational shake and vibration. In addition, since it is not necessary to use a universal joint prior to transmission of rotation between the central shaft 31 and the rotary shaft 33, it is possible to reduce the cost of the universal joint. The rotation mechanism 3 is a rotation mechanism that rotationally drives the main blade member 211 about the fixed center line O and revolves the sub blade member 221 about the fixed center line O. For this reason, it is possible to reduce the manufacturing cost without using a complicated configuration using a swing arm as before. That is, since the rotation mechanism 3 (excavator) digs the excavation hole H having a substantially square excavation cross section with a simple mechanism, failure is unlikely to occur, the reliability is high, and the cost can be reduced.

  21 and 22 show another example of the rotation transmission mechanism 34 in the second embodiment. The rotation transmission mechanism 34 here includes a first engagement portion 341, a second engagement portion 342, and a drive transmission portion 345. The first engagement portion 341 has a disc-like shape having an outer peripheral portion 341a centered on the movement center line P, and the rear end of each rotation shaft 33 so as to rotate around the movement center line P. Are fixed to each. The second engaging portion 342 has an outer peripheral portion 342 a centered on the fixed center line O, and is fixed to the trunk portion 1 by rotatably inserting the central shaft 31. The drive transmission portion 345 engages with the outer peripheral portion 341 a of the first engagement portion 341 and the outer peripheral portion 342 a of the second engagement portion 342 and transmits the rotation of the central shaft 31 as the rotation of the rotation shaft 33. The drive transmission unit 345 includes a rotation shaft 345A and a fifth engagement unit 345B. The rotation shaft 345A is rotatably provided on the main blade member 211 around a center line S parallel to the fixed center line O and the movement center line P. The rotating shaft 345 </ b> A is provided with a rear end penetrating the main blade member 211 extending behind the main blade member 211. Note that two rotation shafts 345A are provided on a single-letter main blade member 211 extending in a direction opposite to the fixed center line O as shown in FIG. The fifth engaging portion 345B is formed in a disc shape having an outer peripheral portion 345Ba with the center line S as the center, and is arranged at the rear end of each rotating shaft 345A so as to rotate around the center line S. It is fixed. In the fifth engaging portion 345B, the outer peripheral portion 345Ba is engaged with the outer peripheral portion 341a of the first engaging portion 341 and the outer peripheral portion 342a of the second engaging portion 342 (for example, engagement by gear meshing). . In addition, the engagement of the outer peripheral portion 341a of the first engaging portion 341, the outer peripheral portion 342a of the second engaging portion 342, and the outer peripheral portion 345Ba of the fifth engaging portion 345B prevents contact slip through a high friction material or the like. May be engaged.

  Even in such other rotation transmission mechanism 34, as in the above-described rotation transmission mechanism 34, the sub blade member 221 provided on the rotation shaft 33 is opposite to the main blade member 211 around the movement center line P. The sub blade member 221 is rotated four times in the reverse direction with respect to one rotation of the main blade member 211. That is, the main blade member 211 has a circular trajectory centered on the fixed center line O, the sub-blade member 221 has a substantially square trajectory centered on the fixed center line O, and has a substantially square excavation cross section. The excavation hole H can be dug.

  By the way, in the excavator having the above-described configuration, a plurality of center shafts 31 are arranged side by side, and the positions of the adjacent excavation cutters are set to the axis of the fixed center line O in such a manner that the rotation trajectories of the adjacent excavation cutters overlap in front view. Arrange by shifting in the direction. If comprised in this way, it becomes possible to obtain the excavation hole of the substantially rectangular excavation cross section which continued the substantially square excavation cross section in series. Further, when a plurality of the central shafts 31 are arranged side by side and arranged so that the rotation trajectories of the adjacent excavation cutters overlap in front view, the adjacent excavation cutters are arranged in the axial direction of the fixed center line O on the same plane. The adjacent central shafts 31 are rotationally driven in the opposite direction while being arranged in the same direction, and a phase difference of, for example, 45 ° is provided in the rotation mechanism so that the excavation cutter does not interfere. Further, similarly, it is possible to obtain a drilling hole having a drilling section in which a conventional circular drilling section and a substantially square drilling section are continuously connected.

  In the second embodiment described above, the rotating mechanism 3 having a substantially square trajectory and the excavator for obtaining a drilling hole having a substantially square excavation cross section have been described. However, the principle of the rotating mechanism 3 is generally applied. It is also possible to provide an excavator that obtains a rotation mechanism that forms a regular polygonal trajectory and an excavation hole having a substantially regular polygonal excavation cross section. Specifically, when the locus and the excavation hole have a substantially regular n-square shape (n ≧ 3), the sub blade member is rotated at a speed (n−1) times in the opposite direction to the main blade member in the absolute coordinate system. . About the amount of eccentricity, it calculates | requires suitably from the dimension of the desired regular n square.

  In each of the above-described embodiments, the rotating mechanism may be provided with a drive unit (not shown) such as a motor that rotates around the center G of the sub blade member 221 having a circular outline. By comprising in this way, excavation capability can be improved.

  In each of the above-described embodiments, an example in which the rotation mechanism 3 is applied to an excavator has been described. However, the rotation mechanism 3 is not limited to an excavator. For example, as another use of the rotating mechanism 3 having a substantially rectangular or oval locus, it is used for excavation of a substantially rectangular or oval cross section with an underground continuous wall or the like, or a hardening material such as cement is used. Used to mix and stir the ground together with a hardener to improve the ground injected into the ground, use it for cutting a substantially rectangular or oval shape of a workpiece, or to stir kneaded materials other than the ground For example, various applications are possible. That is, when the rotation mechanism 3 is used for ground improvement or kneading and stirring, each blade member becomes a stirring blade. Further, when the rotating mechanism 3 is used for cutting, a cutting blade is provided on each blade member to form a cutting cutter. Therefore, excavation in each embodiment of the present invention is used in the meaning including stirring and cutting.

It is a schematic sectional side view which shows Embodiment 1 of the excavator using the rotation mechanism which concerns on this invention. It is the conceptual diagram which looked at the excavator shown in FIG. 1 from the axial direction (front direction). FIG. 3 is a partially enlarged view of FIG. 2. It is a conceptual diagram which shows operation | movement of the rotation mechanism shown in FIG. It is a conceptual diagram which shows operation | movement of the rotation mechanism shown in FIG. It is a conceptual diagram which shows operation | movement of the rotation mechanism shown in FIG. It is a conceptual diagram which shows operation | movement of the rotation mechanism shown in FIG. It is a figure which shows the excavation locus | trajectory in the absolute coordinate system of the rotation mechanism shown in FIG. It is a schematic sectional side view which shows Embodiment 2 of the excavator using the rotation mechanism which concerns on this invention. It is the conceptual diagram which looked at the rotation mechanism shown in FIG. 9 from the axial direction (front direction). FIG. 11 is a partially enlarged view of FIG. 10. It is a conceptual diagram which shows operation | movement of the rotation mechanism shown in FIG. It is a conceptual diagram which shows operation | movement of the rotation mechanism shown in FIG. It is a conceptual diagram which shows operation | movement of the rotation mechanism shown in FIG. It is a conceptual diagram which shows operation | movement of the rotation mechanism shown in FIG. It is a conceptual diagram explaining the rotation mechanism shown in FIG. It is a conceptual diagram which shows operation | movement of the rotation mechanism shown in FIG. It is a conceptual diagram which shows operation | movement of the rotation mechanism shown in FIG. It is a conceptual diagram which shows operation | movement of the rotation mechanism shown in FIG. It is a figure which shows the excavation locus | trajectory in the absolute coordinate system of the rotation mechanism shown in FIG. 6 is a schematic cross-sectional side view showing an excavator using another rotation transmission mechanism in Embodiment 2. FIG. It is the conceptual diagram which looked at the rotation mechanism shown in FIG. 21 from the axial direction (front direction).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Trunk part 21 Main excavation cutter 211 Main blade member 22 Sub excavation cutter 221 Sub blade member 3 Rotation mechanism 31 Central axis 32 Drive part 33 Rotation shaft 34 Rotation transmission mechanism 341 First engagement part 341a Outer peripheral part 342 Second engagement part 342a Outer part 344 Drive transmission part 344A Rotating shaft 344B Third engagement part 344Ba Outer part 344C Fourth engagement part 344Ca Outer part 344D Transmission member 345 Drive transmission part 345A Rotating shaft 345B Fifth engagement part 345Ba Outer part a Oval Short side length of shape (substantially square side length)
b Sub-blade member radius D Peripheral diameter of first engaging portion (fourth engaging portion) G Center of sub-blade member H Drilling hole O Fixed center line P Moving center line r Eccentricity S Center line

Claims (4)

A central axis provided rotatably about a predetermined fixed center line;
A main blade member provided extending in a radially outward direction of the central axis;
A rotation shaft provided to be rotatable with respect to the main blade member around a movement center line parallel to the fixed center line;
A sub-blade member that extends in a radially outward direction of the rotary shaft and that is provided in such a manner that the protruding dimension from the tip of the main blade member changes as the rotary shaft rotates,
A drive unit that rotationally drives the central axis;
A rotation transmission mechanism for transmitting one rotation of the central shaft as a predetermined rotation of the rotation shaft;   The rotation transmission mechanism includes a first engagement portion provided on the rotation shaft having a circular outer periphery centered on the moving center line, and a circular outer periphery centered on the fixed center line. A second engaging portion that is rotatably inserted and fixed to the central shaft, and an outer peripheral portion of the first engaging portion and an outer peripheral portion of the second engaging portion to engage with the outer peripheral portion of the central shaft. 2. A drive transmission unit configured to transmit the rotation as rotation of a rotation shaft and rotate the sub blade member twice in the same direction with respect to one rotation of the main blade member. Rotation mechanism.   3. The rotation according to claim 1, wherein the sub blade member has a circular outline, and has a position shifted from the center by a predetermined eccentric amount as a rotation center placed on the movement center line. 4. mechanism. Using the rotation mechanism according to any one of claims 1 to 3,
A cylindrical body portion that supports the second engaging portion and has the driving portion disposed therein,
A main excavation cutter in which a cutter is disposed on the main blade member;
An excavator comprising: a sub-excavation cutter in which a cutter is disposed on the sub-blade member.

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