• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    An underground drilling machine that includes a vehicle frame, a boom, and a drill bit head. The boom includes a first end coupled to the vehicle frame and a second end. The drill bit head comprises a rotational joint, a first arm, a second arm angularly separated from the first arm. The rotation joint defines a rotation axis and carries the drill bit head for rotation with respect to the other end of the boom. The first arm includes a first end coupled to the pivot joint, a second end, and at least one disc insert coupled to the first arm and oriented to engage the wall. The first arm extends from the first end towards the second end in a plane perpendicular to the axis of rotation. The second arm includes a first end coupled to the pivot joint, a second end, and at least one disc insert coupled to the second arm and oriented to engage the wall. The second arm extends from the first end towards the second end in a plane perpendicular to the axis of rotation.
    公开号:SE1350247A1
    申请号:SE1350247
    申请日:2011-08-03
    公开日:2013-03-01
    发明作者:Arthur K Moeller；Charl C Veldman
    申请人:Joy Mm Delaware Inc；
    IPC主号:
    专利说明:

    Arm and oriented to engage the wall. The second arm extends from the first end towards the second end in a plane perpendicular to the axis of rotation.
    In another embodiment, the invention provides an underground drilling machine for creating a tunnel in a wall. The underground drill is supported by a floor defining a floor plan, and the underground drill comprises a vehicle frame, a boom, and a drill bit head.
    The vehicle frame carries the underground drill on the floor and defines a frame axis that is parallel to the floor plane. The boom includes a first end slidably coupled to the vehicle frame, a second end, a first portion near the first end, a second portion rotatably coupled to the first portion, and a third portion when the second end and rotatably coupled to the second portion. The drill bit head comprises a rotational joint, a first arm, a second arm angularly separated from the first arm. The rotation joint defines a rotation axis and is rotatably coupled to the other end of the boom. The first arm includes a first end coupled to the pivot joint, a second end, and at least one disc insert coupled to the first arm and oriented to engage the wall. The second arm includes a first end coupled to the pivot joint, a second end and at least one disc insert coupled to the second arm oriented to engage the wall. The second boom portion rotates with respect to the first boom portion about a first axis which is substantially perpendicular to the frame axis. The third boom portion rotates with respect to the second boom portion about a second axis that is substantially perpendicular to the first axis, and the drill bit head rotates with respect to the second end of the boom about the axis of rotation.
    In a further embodiment, the invention provides a cutting head for drilling through a wall, the cutting head comprising a rotary connection, a first arm, and a second arm. The rotation connection defines a rotation axis and carries the cutting head for rotation about the rotation axis. The first arm includes a first end, a second end, and at least one disc insert. The first end is connected to the rotary connection. The first arm extends from the first end towards the second end in a direction which is substantially perpendicular to the axis of rotation. The at least one disc insert is connected to the first arm and oriented to engage the wall. The second arm is angularly separated from the first arm. The second arm includes a first end, a second end, and at least one disc insert. The first end is connected to the rotary connection. The second arm extends from the first end towards the second end in a manner which is substantially perpendicular to the axis of rotation. The at least one disc insert is connected to the other arm and oriented to engage the wall.
    Other aspects of the invention will be apparent from the detailed description and accompanying drawings.
    Brief Description of the Drawings Fig. 1 is a perspective view of a drilling machine according to an embodiment of the invention.
    Fig. 2 is a side view of the drilling machine of Fig. 1.
    Fig. 3 is a top view of the drilling machine of Fig. 1.
    Fig. 4 is an enlarged section taken from the side of the drilling machine of Figs.
    Fig. 5 is a top view of the drilling machine of Fig. 1, with a cutting head articulated on the left side.
    Fig. 6 is a front view of the drilling machine of Fig. 1.
    Fig. 7 is a perspective sectional view of the drill bit head.
    Fig. 8 is a side view of the drill bit head.
    Fig. 9 is a perspective view of a profile cutting head.
    Before describing in detail any embodiment of the invention, it should be noted that the invention is not limited in its use to the construction details and the arrangement of components described in the following description or illustrated in the following drawings. The invention has other embodiments and can be realized or used in different ways. Detailed Description Figs. 1 and 2 illustrate an underground drill 10 for engaging a wall (not shown) to create a tunnel or entrance to the wall.
    The drilling machine 10 includes a vehicle frame 18, a boom 22, a drill cutting head 26, a pair of profile cutting heads 30, a stabilization system 34, and a material handling system 38. The frame 18 defines a frame shaft 46 (Fig. 3) and includes a pair of grooves (50) for support the vehicle frame 18 on a floor or support surface. In other embodiments, the frame 18 may include a hydraulic actuating mechanism or hydraulic drive mechanism, and may include fewer or more profile cutting heads 30. The frame 18 may also include additional pumping stations and power supply parts (not shown) to provide primary drive energy to the drill bit head 26 and profile cutting heads 30.
    As shown in Figs. 3 and 4, the boom 22 includes a first end 58 (Fig. 4), a second end 62, a first portion (Fig. 4) near the first end 58, a second portion 70 rotatably coupled to the first the portion 66, a third portion 74 near the second end 62 and rotatably coupled to the second portion 70, feed cylinders 78 (Figs. 2 and 4), a vertical actuator 82 (Fig. 2), and a horizontal actuator 86. In this application the term "horizontal" and variants thereof refer to a direction in a plane parallel to the floor. In this application, the term "vertical" and variants thereof refer to a direction in a plane perpendicular to the floor. The first end 58 of the boom 22 is coupled to the vehicle frame 18 by, for example, a rail (not shown) which allows the boom 22 to slidably extend and retract in a direction parallel to the frame shaft 46. Feed cylinders 78 drive the first end 58 of the boom 22 to move the boom 22 with respect to the vehicle frame 18.
    The second portion 70 of the boom 22 is rotatably coupled to the first portion 66 of the boom 22 through a first pivot 90 (Fig. 4) defining a first axis 94. The second portion 70 is rotated with respect to the first portion 66 about the first the shaft 94. In the illustrated embodiment, the vertical actuators 82 drive the second portion 70 to rotate about the first shaft 94. The first shaft 94 is substantially perpendicular to the frame shaft 46 and is substantially parallel to the floor. Thus, rotation of the second portion 70 about the first axis 94 changes the pitch or vertical height of the second end 62 of the boom 22.
    The third portion 74 of the boom 22 is rotatably coupled to the second portion 70 of the boom 22 through a second pivot 98 defining a second axis 102. The third portion 74 is rotated with respect to the second portion 70 about the second axis 102 (Figs. 4). As shown in Fig. 5, the horizontal actuators 86 drive the third portion 74 to rotate about the second axis 102. The second axis 102 is substantially perpendicular to the first axis 94 and substantially perpendicular to the frame axis 46. Rotation of the third portion 74 about the second shaft 102 thus changes the horizontal orientation of the second end 62 of the boom 22. In the illustrated embodiment, the vertical actuators 82 and the horizontal actuators 86 are cylindrical cylinders.
    In other embodiments, a rotary actuator, including a gearbox, may be coupled to the pivot joints 90, 98 to provide the second portion 70 and the third portion 74 with joints. Also, the first pivot 90 may be positioned vertically to control the horizontal orientation of the second end 62 of the boom 22, and the second pivot 98 may be positioned horizontally to control the vertical position of the second end 62 of the boom 22.
    Referring to Fig. 3, the drill bit head 26 includes a rotary base 110 (Fig. 4), a motor (not shown), a body 118, a first arm 126, and a second arm 130 (Fig. 6). The rotary base joint 110 defines a rotation shaft 134, and includes a support member 142 and a rotary coupling 146. The rotary coupling 146 is attached to the body 118 of the drill bit head 26.
    The rotary clutch 146 can rotate continuously with respect to the support member 142 so that continuous rotation of the drill bit head 26 is allowed with respect to the other end 62 of the boom 22. The motor is positioned within the support member 142 and drives the rotary clutch 146 for rotation about the rotation axis 134. As illustrated in FIG. 6, the drill bit head 26 rotates counterclockwise. The rotary base joint 110 supports hydraulic, electrical, and vacuum conductors for connecting the motor and other components within the drill bit head 26, while the drill bit head 26 rotates. Rotary base joints are well known in the art and require no further description.
    As shown in Figs. 6 and 7, the body 118 is positioned behind the first arm 126 and the second arm 130 and defines an inner cavity 158 (Fig. 7). In the illustrated embodiment, the body 118 is generally shaped as a planar disc having a diameter substantially equal to the combined length of the first arm 126 and the second arm 130, and includes four inlet tubes 162. The body 118 rotates with the support member 142 about the axis of rotation 134 The tubes 162 are positioned to follow the first arm 126 and the second arm 130 as the arms 126, 130 rotate, and the tubes 162 collect the material released from the wall and guide the material into the inner cavity 158. In the second embodiment, the body 118 may include fewer or more tubes 162 and may be of a different size or shape.
    The body 118 may, for example, be a simple frame for supporting the first arm 126 and the second arm 130.
    Referring back to Figs. 3 and 6, the first arm 126 includes a first end 170, a second end 174, and a plurality of disc inserts 178 connected to the first arm 126. The first arm 126 is coupled to the body 118 and is substantially perpendicular. to the rotation shaft 134. The second arm 130 also includes a first end 186, a second end 190, and a plurality of disc inserts 178 connected to the second arm 130. The second arm 130 is coupled to the body 118 and is substantially perpendicular to the rotation shaft 134. The first the arm 126 and the other arm 130 rotate with the body 118 about the axis of rotation 134.
    In the illustrated embodiment, the first arm 126 and the second arm 130 extend radially from the axis of rotation 134. The first arm 126 and the second arm 130 are separated by an angle of 180 °, and the first arm 126 and the second arm 130 are formed as a unified element. In the second embodiment, the first arm 126 and optionally the second arm 130 may extend in an arcuate manner from the axis of rotation 134, so that the first arm 126 and the second arm 130 have a helical shape along the axis of rotation 134. The first arm 126 and the second the arm 130 may also be formed to have a straight portion and an arcuate portion. In other embodiments, the first arm 126 and the second arm 130 may be spaced apart by a different angle, and the first arm 126 and the second arm 130 may be formed as two separate parts. In other embodiments, the drill bit head 26 may include fewer or more arms.
    As shown in Fig. 8, the first arm 126 and the second arm 130 define a mounting surface 202 near the front of the drill bit head 26. In the illustrated embodiment, the mounting surface 202 has a convex shape defined by the first arm 126 and the second arm 130.
    The mounting surface 202 extends further in front of the vehicle frame 18 near the first end 170 of the first arm 126 and near the first end 186 of the second arm 130. The mounting surface 202 tapers towards the vehicle frame 18 near the second end 174 of the first arm 126 and the second the end 190 of the second arm 130. This convex shape releases stresses on the disc inserts 178 as it drills into the material wall. In other embodiments, the mounting surface 202 may be more or less tapered to form a deeper or shallower convex shape, or the mounting surface 202 may have a flat shape.
    The disc inserts 178 are mounted in the first arm 126 and the second arm 130 to engage the wall. Each disc insert 178 is independently rotatable to provide a homogeneous contact and a symmetrical extraction pattern. The disc inserts 178 minimize uncut ledges or steps and provide a clean surface profile. Referring back to Fig. 3, the disc insert 178 is oriented at an angle of attack 210 with respect to a plane 206 tangent to the mounting surface 202, and the disc insert 178 engages the wall as the first arm 126 and the second arm 130 rotate about the axis of rotation 134. the illustrated embodiment includes the first arm 126 and the second arm 130 so that four disc inserts 178, and the angle of attack is approximately 10 ° with respect to the plane 206. In other embodiments, each arm may include fewer or more disc inserts 178.
    The drill bit head 26 includes a sluggish mass integrated with the body 118 to absorb the dynamic load of the disc inserts 178. The mass is positioned to provide relative rigidity and damping properties to the drill bit head 26 to maintain the total shock and vibration levels within acceptable machine design limits. The mass isolates the dynamic load from the rest of the drill 10.
    When the drill bit head 26 rotates (counterclockwise as shown in Fig. 6), the leading edge of each disc insert 178 is angled forward. This is best illustrated in Fig. 8. Each disc insert 178 rotates about an axis (not shown) perpendicular to the mounting surface 202, and the disc insert 178 chips and breaks the material in the wall. Each disc insert 178 is coupled to a sluggish mass, such as lead, held within each arm 126, 130. In the illustrated embodiment, four disc inserts 178 are connected to each arm 126, 130, and an angle of attack 210 is approximately 10 °. In other embodiments, fewer or more disc inserts 178 may be mounted on each arm 126, 130, and the disc inserts 178 may be oriented at a different angle of attack 210.
    In another embodiment (not shown), each disc insert 178 may include a load cell equipped with a strain gauge that measures the cutting force on the disc insert 178, 194. The load cell includes a plurality of measuring points for determining linear forces in three dimensions as well as torque about the axis of rotation of the disc insert This data is sent to a control system (not shown) which receives feedback from the load cell to control the cutting speeds.
    As shown in Figs. 3 and 9, the profile cutting heads 30 are positioned behind the drill bit head 26 and close to the floor. Each cutting head 30 includes an integrated inertia mass, which provides relative rigidity and damping properties to the profile cutting head 30. The inertial mass maintains the overall shock and vibration levels within acceptable machine design limits. In the illustrated embodiment, each profile cutting head 30 includes five disc inserts 178, and each profile cutting head 30 is rotatable by hydraulic cylinders 218 to change the orientation of the disc insert 178 with respect to the wall and adjust the angle of attack 210. In other embodiments, the profile cutting head 30 may comprise , and the profile cutting head 30 may be rotatable by a rotary actuator, such as a gear. Referring to Fig. 6, as the drill bit head 26 penetrates through the wall material, the profile cutting head 30 removes material near the floor to provide a rectangular section in the lower portion of an excavation profile 222 and create a path for the grooves 50 and form a flat floor and flat walls. In other words, the profile cutting heads 30 cut off the sides of the tunnel as the drill 10 advances. Each profile cutting head 30 is independently rotatable to provide a homogeneous contact and a symmetrical extraction pattern even when the drill bit head 26 is rotated. The profile cutting heads 30 minimize uncut steps and provide a clean surface profile.
    As shown in Figs. 1-3, the stabilizing system 34 includes four stabilizing cylinders 230 and six grippers 234. Each stabilizing cylinder 230 is positioned at a corner of the vehicle frame 18. In other embodiments, the stabilizing system 34 may include fewer or more stabilizing cylinders 234. Each stabilizing cylinder 230 includes a head end 238 for engaging the floor or support surface. The cylinders 230 are extensible to allow the drilling machine 10 to be supported from the grooves 50 during the drilling operation. Similarly, the grippers 234 are extendable from the upper part of the vehicle frame 18 to support the roof or tunnel portion which is above the drilling machine 10.
    As shown in Fig. 2, the material handling system 38 includes an intake source 242, a vacuum tube 246 in external communication with the inner cavity 158 of the body, a collector 250, and a conveyor 254 mounted on the rear of the vehicle frame 18. The intake source 242 is positioned on the vehicle frame 18 and provides vacuum pressure within the inlet tubes 162, the inner cavity 158 and the vacuum tube 246. The vacuum tube extends from the inner cavity 158 of the body through the rotary base joint 110 and into the collector 250. The vacuum tube 246 may be constructed of a flexible material to accommodate the movement of the movement. 26. The collector 250 is positioned on the vehicle frame 18 and separates the released material from all water in the collector 250. After separation, the material is transferred to the collector 254, which in turn transports the material to a transport system (not shown) for transport away from the drill 10. In another embodiment (not shown), after that material t is separated from the water, it can be transported away from the drilling machine 10 through a line under suction pressure. In another embodiment (not shown), the drill bit head 26 includes a retraction system for enclosing the material released by the disc cutters 178 against the wall. The retraction system may include a plurality of water spray blocks for wetting the dirt and dust from the wall and preventing the dirt from traveling past the drill bit head 26 and the profile cutter heads 30 toward the rear of the machine 10.
    During operation, the stabilizing cylinders 230 are extended to lift the drill up from the grooves 50 and ensure that the vehicle frame 18 is smooth. In addition, the grippers 234 extend to engage the roof to provide support above the drill 10. While the vehicle frame 18 is in the supported position, the boom 22 is rotated to orient the drill bit head 26 in the correct direction to excavate an entrance or tunnel. The boom 22 slides with respect to the vehicle frame 18 to extend the drill bit head 26 along the axis of rotation 134 and drill deeper into the wall. Alternatively, the drill 10 may be operated while the vehicle frame 18 is supported on the grooves (i.e., without extending the stabilizing cylinders and grippers) so that the weight of the drill 10 stabilizes the drill bit head 26. The profile cutting heads 30 are also positioned to engage the portion of the wall 26 between the drill bit and the head.
    The drill bit head 26 is driven by the motor to rotate about the axis of rotation 134. As the drill bit head 26 rotates, the disc cutter 178 engages the wall at an angle of attack 210 and causes material to freeze and break away from the wall. Fig. 8 shows the orientation of the disc inserts 178 on each arm 126 and 130. In the illustrated embodiment, the engaging disc inserts 178 near the axis of rotation 134 with the wall first, and the disc inserts 178 progressively further away from the rotary base joint 110 engage the wall as the drill bit head 26 moves into the wall. As the drill 10 advances through the wall, the profile cutting heads 30 engage a portion of the wall below the drill bit head 26 and above the floor and form the excavation profile 222 illustrated in Fig. 6. The profile cutting heads 30 extend the cutting profile of the drill bit head 26 and allow the vehicle 20 to advance. 11 wall. The profile cutting heads 30 can be extended or retracted to change the width of the lower portion.
    When material is released from the wall, a suction pulls the material through the inlet tubes 162 and into the inner cavity 158. The material passes into the vacuum tube 246 and is transported to the collector 250. After the collector 250 separates the material from all water, the material is placed on the conveyor 254 at the rear of the machine. The conveyor 254 transports the material to the conveyor system, which transports the material away from the drilling machine 10.
    The machine 10 is provided with a control and automation system on board which operates the machine as described above, including controlling the orientation of the boom 22, by remote control, operators on board, or both. The pivot joints 90, 98 may include sensors to monitor the magnitude of the reaction forces during cutting, so that the automation system controls the position of the feed cylinders 78 based on feedback from the cutting force sensors. Such sensors may include, for example, angle converters, load cells and / or strain gauges. This increases the life of the disc inserts 178.
    The invention thus provides, inter alia, an underground drilling machine. Various features and advantages of the invention are illustrated by the following claims.
    权利要求:
    Claims (29)
    [1]
    An underground drilling machine for creating a tunnel in a wall, which machine comprises a vehicle frame, a boom comprising a first end coupled to the vehicle frame and a second end, a drill bit head comprising a rotational seed, a first arm, a second arm angularly separated from it the first arm, said rotating joint defining a rotation axis and supporting the drill bit head for rotation with respect to the second end of the boom, the first arm comprising a first end coupled to the rotating joint, a second end, and at least one disc insert coupled to the first arm, and oriented to engage the wall, the first arm extending from the first end toward the second end in a plane perpendicular to the axis of rotation, the second arm comprising a first end coupled to the pivot joint, a second end, and at least one disc insert coupled to the other arm and oriented to engage the wall, the other arm extending from the n the first end towards the second end in a plane perpendicular to the axis of rotation.
    [2]
    An underground drilling machine according to claim 1, wherein the first arm extends radially from the axis of rotation.
    [3]
    An underground drilling machine according to claim 2, wherein the second arm extends radially from the axis of rotation, and the first arm and the second arm are spaced apart by an angle of approximately 180 °.
    [4]
    An underground drill according to claim 1, wherein said at least one disc insert of the first arm is oriented so that said at least one disc insert engages the wall at an angle of attack as the first arm rotates about the axis of rotation. 10 15 20 25 30 13
    [5]
    An underground drill according to claim 4, wherein said at least one disc insert of the second arm is oriented so that said at least one disc insert engages the wall at the angle of attack as the second arm rotates about the axis of rotation.
    [6]
    An underground drilling machine according to claim 5, wherein the first arm and the second arm define a first surface near the wall, and wherein the angle of attack is approximately 10 ° with respect to a plane tangential to the first surface.
    [7]
    An underground drilling machine according to claim 1, wherein the first arm and the second arm define a first surface near the wall, the first surface having a convex shape.
    [8]
    An underground drilling machine according to claim 1, and further comprising at least one inlet pipe near the drill bit head for collecting material released from the wall.
    [9]
    An underground drilling machine according to claim 8, wherein said at least one inlet pipe is in external communication with an intake source.
    [10]
    An underground drilling machine according to claim 8, wherein the material released from the wall is transported through a vacuum tube to a conveyor positioned behind the vehicle frame.
    [11]
    An underground drilling machine according to claim 8, wherein the material released from the wall is transported through a vacuum tube to a collector.
    [12]
    An underground drilling machine according to claim 1, and further comprising a profile cutting head positioned behind the drilling cutting head and close to a floor of the tunnel. 10 15 20 25 30 14
    [13]
    An underground drilling machine according to claim 12, wherein said profile cutting head is rotatably coupled to the vehicle frame.
    [14]
    An underground drilling machine according to claim 1, and further comprising at least one stabilizing cylinder for supporting the drilling machine from the floor and at least one gripper for supporting a roof portion above the drilling machine.
    [15]
    An underground drilling machine for creating a tunnel in a wall, the underground drilling machine being supported by a floor defining a floor plan, the underground drilling machine comprising a vehicle frame for supporting the underground drilling machine on the floor, the vehicle frame defining a frame shaft which is parallel to the floor plane, a boom comprising a first end slidably coupled to the vehicle frame, a second end, a first portion near the first end, a second portion rotatably coupled to the first portion, and a third portion near the second end and rotatably coupled thereto the second portion, a drill bit head comprising a rotating joint, a first arm, a second arm angularly separated from the first arm, said rotating joint defining a rotation axis and being rotatably coupled to the second end of the boom, the first arm comprising a first end coupled to the pivot joint, a second end, and at least one disc insert connected to the first arm and o oriented to engage the wall, the second arm comprising a first end coupled to the pivot joint, a second end and at least one disc insert coupled to the second arm oriented to engage the wall, the second boom portion rotating with respect to the first boom portion about a first axis substantially perpendicular to the frame axis, the third boom portion rotating with respect to the second boom portion about a second axis substantially perpendicular to the first axis, the drill bit head rotating with respect to the second end of the boom about the axis of rotation. 10 15 20 25 30 15
    [16]
    An underground drilling machine according to claim 15, wherein the boom slides with respect to the vehicle frame in a direction parallel to the frame axis.
    [17]
    An underground drilling machine according to claim 15, wherein the first axis is substantially parallel to the floor.
    [18]
    An underground drilling machine according to claim 15, wherein the first arm and the second arm extend radially from the axis of rotation, and the first arm and the second arm are separated by an angle of approximately 180 °.
    [19]
    An underground drill according to claim 15, wherein said at least one disc insert of the first arm is oriented to engage the wall at an angle of attack when the first arm rotates about the axis of rotation, and said at least one disc insert of the second arm is oriented to engage the wall at an angle of attack when the other arm rotates about the axis of rotation.
    [20]
    An underground drilling machine according to claim 15, wherein the drill bit head further comprises at least one inlet pipe near the first arm for collecting material released from the wall, said at least one inlet pipe being in fluid communication with an intake source.
    [21]
    An underground drilling machine according to claim 20, wherein the material released from the wall is transported through a vacuum tube to a conveyor positioned behind the vehicle frame.
    [22]
    An underground drilling machine according to claim 15, further comprising a profile cutting head positioned behind the drilling cutting head and close to the floor.
    [23]
    An underground drilling machine according to claim 22, wherein the profile cutting head is rotatably coupled to the vehicle frame. 10 15 20 25 30 16
    [24]
    An underground drilling machine according to claim 15, further comprising at least one stabilizing cylinder for supporting the drilling machine from the floor.
    [25]
    A cutting head for drilling through a wall, the cutting head comprising a rotary connection defining a axis of rotation and supporting the cutting head for rotation about the axis of rotation, a first arm comprising a first end, a second end, and at least one disc insert, the first end being coupled to the rotary connection, the first arm extending from the first end towards the second end in a direction substantially perpendicular to the axis of rotation, said at least one disc insert being coupled to the first arm and oriented to engage the wall, a second arm angularly separate from the first arm, the second arm comprising a first end, a second end, and at least one disc insert, the first end being connected to the rotary connection, the second arm extending from the first end towards the second end in a manner is substantially perpendicular to the axis of rotation, said at least one disc insert being coupled to the second arm n and oriented to intervene with the wall.
    [26]
    The cutting head of claim 25, wherein the first arm defines a first axis and the second arm defines a second axis, the first axis and the second axis extending radially from the axis of rotation.
    [27]
    A cutting head according to claim 26, wherein the first shaft and the second shaft are separated by approximately 180 ".
    [28]
    The cutting head of claim 25, wherein said at least one disc insert of the first arm is oriented to engage the wall at an angle of attack when the first arm rotates about the axis of rotation, and said at least one disc insert of the second arm is oriented to engage the wall at a angle of attack when the other arm rotates about the axis of rotation. 17
    [29]
    The cutting head of claim 28, wherein the first arm and the second arm define a first surface near the wall, and wherein the angle of attack is approximately 10 ° with respect to a plane tangential to the first surface. The cutting head of claim 25, further comprising at least one inlet pipe located near the first arm and positioned to collect material released from the wall. The cutting head of claim 30, wherein said at least one inlet pipe is in fluid communication with an intake source.
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    同族专利:
    公开号 | 公开日
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    2016-06-14| NAV| Patent application has lapsed|
    优先权:
    申请号 | 申请日 | 专利标题
    US37034210P| true| 2010-08-03|2010-08-03|
    PCT/US2011/046366|WO2012018882A1|2010-08-03|2011-08-03|Underground boring machine|
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