JP2007278047A - Joint device of excavating rod of excavator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the size and weight of a joint device of an excavating rod and improve the durability thereof, and to simplify its mounting to an existing excavator. <P>SOLUTION: The excavator includes a female joint for joining the excavating rod to an output shaft of a rotary drive device in a manner of being fit to a male joint of the excavating rod of which the rotary drive device is supported along a leader erected on a base machine so as to be elevated. In the excavator, a collector ring for feeding power to a plurality of electric cylinders is arranged on the outer periphery of the female joint of a rotary part, and cylinders integrally rotated with the female joint are hung on the outer periphery of the female joint. A pair of right and left fixing-metal piece push-in plates are supported to the front end of the rod of the electric cylinders by the intermediary of a spring in a movable manner in an axial direction of the female joint. A fixing metal piece mounted to be movable back and forth in a radial direction is engaged with or disengaged from a pin fitting groove of the male joint of the excavating rod inserted into the female joint accompanied by the movement of the fixing-metal-piece press-in plate. Thus, the joint device is unitized, so that it can be easily mounted to the existing excavator, and the small-sized, lightweight and durable joint device can be obtained. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a connecting device for a drilling rod in an excavator in which a rotary drive device and a drilling rod are attached to a base machine.

As a conventional method for connecting excavation rods in an excavator, there is a connection device for connecting a excavation rod by operating a mechanism by suspending a cylinder from a case of a rotary drive device.
In addition, related technologies include the following properties.

Japanese Utility Model Publication No. 6-27990 Japanese Utility Model Publication No. 6-43092 Japanese Patent Laid-Open No. 9-209680

  The technical content of Patent Document 1 includes a lock member that engages and disengages in a lock groove formed on a male joint of a rod that is inserted into a female joint provided on an output shaft, so that the lock member can advance and retreat in the radial direction of the female joint, In a rod connecting device for an excavator that moves the lock member forward and backward with a cylinder, the cylinder is disposed in a non-rotating portion, and a ring that rotates integrally with the female joint is vertically attached to a rod end of the cylinder via a bearing. A rod connecting device for an excavator, wherein the rod connecting device is supported so as to be movable, and an advancing / retreating mechanism is provided between the ring and the locking member to advance and retract the locking member as the ring moves up and down.

  The technical content of the above-mentioned patent document 2 is that an excavating rod is connected to a drive unit that can be raised and lowered along a tower, and the excavator drills a hole in the ground by rotationally driving the excavation rod. An inner rod that is connected to the output shaft and hangs down, and an outer rod that is non-rotatable and axially slidable on the inner rod, and is suspended and supported by a cylinder in the drive unit. The lower end portion of the rod is provided with a female joint portion for connecting a drilling rod, and in this female joint portion, a rotary cylinder having a locking portion that can be freely engaged with and disengaged from the engaging portion of the male joint portion of the drilling rod is rotatable. An automatic connecting device for an excavating rod in an excavator, which is mounted so as not to move up and down, and is linked so that the rotating cylinder rotates at a required angle by the vertical movement of the outer rod.

  The technical content of Patent Document 3 is an excavator having a female joint that fits the male joint of the excavation rod and connects the excavation rod to the output shaft of the drive unit supported so as to be movable up and down along the leader mast. A lock piece that is provided on the inner wall portion of the female joint and is detachable in a pin fitting groove formed in a direction perpendicular to the axis of the male joint in the first stage, and a pair of left and right hangs on the drive portion side A lifting ring member that is coupled to a piston rod of the hydraulic cylinder and rotationally surrounds the female joint, and a pivot that is provided on the lifting ring member and rotates in a horizontal plane in conjunction with the vertical movement of the ring member. An automatic connecting device for an excavating rod in an excavator, comprising: a ring; and a cam mechanism that moves the lock piece forward and backward in linkage with the rotation of the rotating ring.

  There are also JP-A-9-170395 and JP-A-11-50774.

  In the conventional coupling device described above, it is difficult to simplify the mechanism because a pair of cylinders are suspended from the case of the rotary drive device.

  In Patent Document 1, a pair of cylinders are suspended from a case of a rotary drive device, and a taper ring that rotates integrally with a female joint via a bearing from an outer ring is supported so as to be movable up and down. When attaching the connecting device to the case, it is difficult to attach a pair of cylinders to the case of the rotary drive device or to adjust the mounting dimensions.

  Further, since the non-rotating part and the rotating part are supported via the bearing, the structure becomes complicated and the whole is increased in size and requires a large space in the radial direction.

  Furthermore, the structure in which the fixing bracket is advanced and retracted in the radial direction along with the up and down movement of the taper ring is a taper surface that gradually reduces the diameter of the taper ring, so that the taper surface of the taper ring and the semicircular portion on the back surface of the lock member are It always becomes a sliding part by point contact, and there is a problem in durability of the metal by repetition.

  The present invention is intended to solve the problems of the conventional configuration as described above, and makes it easy to attach the connecting device to an existing excavator to increase durability and reduce the size of the device. The purpose is to achieve weight reduction.

  In order to solve the above problems, the present invention connects a drilling rod by fitting a male joint of a drilling rod to an output shaft of a rotary driving device supported so as to be movable up and down along a leader standing on a base machine. In an excavator having a female joint, a plurality of electric cylinders that rotate integrally with the female joint are provided on the outer periphery of the female joint by disposing a slip ring for power feeding to the electric cylinder on the outer periphery of the female joint of the rotating part. A pair of left and right fixing metal push plates are supported at the tip of the rod of the electric cylinder via a spring so as to be movable in the axial direction of the female fitting, and the male joint of the excavating rod inserted into the female joint as the fixing metal push plate moves. An excavating rod coupling device in an excavator, wherein a fixing fitting provided in a pin fitting groove so as to be movable forward and backward in a radial direction is fitted and detached.

Since the present invention is constituted as described above, the following effects can be expected.
1. Since the electric cylinder is installed vertically on the flange plane above the female joint, the connecting device is unitized and can be easily installed on existing excavators.
2. Since the coupling device is unitized, the mechanism is simplified and the size and weight can be reduced.
3. Since the slide contact portion of the main part is a surface contact, durability can be enhanced.
4). Since the mechanism is operated via a spring at the tip of the rod of the electric cylinder, the spring absorbs an excessive load and protects the mechanism.

  Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the excavator has a rotary drive device 4 that can move up and down along a guide rail 3 of a leader 2 erected on a base machine 1, and this rotary drive device 4 is a top sheave at the upper end of the leader 2. The wire 6 is suspended by a winch 7 mounted on the base machine 1.

  The male joint 11 of the excavating rod 10 is connected to the connecting device 9 shown in part A of FIG. 1 fixed to the tip of the output shaft 8 located at the lower portion of the rotary drive device 4 with a bolt 12.

  FIG. 2 shows a first embodiment of the present invention. The connecting device 9 is fixed by bolts 12 at the front end of the output shaft 8 of the rotary drive device 4 and a flange 13 positioned above the female joint 14.

  A slip ring 23 for supplying power to the electric cylinder 18 is arranged on the outer periphery of the flange 13 above the female joint 14 of the rotating portion, and the power cable 20 passes the brush 21 and the slip ring 23 from the lead wire 22 to the electric cylinder 18. Power is supplied.

  A plurality of electric cylinders 18 are suspended from the plane of the flange 13 above the female joint 14, and a sleeve 28 is connected to a connecting plate 16 that connects a pair of left and right fixing metal pressing plates 17 to the tip of a rod 25 of the electric cylinder 18. The spring 19 and the nut 27 are supported so as to be movable in the axial direction of the female joint 14.

  The inner wall of the female joint 14 corresponding to the pin fitting groove 24 formed in the direction perpendicular to the axis of the male joint 11 of the excavating rod 10 inserted into the female joint 14 as the fixing metal pushing plate 17 moves. Further, a pair of left and right fixing brackets 15 are provided so as to be able to advance and retreat so that the inner ends thereof face each other in the direction of the pin fitting groove 24.

  The inner surface of the fixing metal pushing plate 17 and the side surface opposite to the axial center of the fixing metal 15 are in contact with each other, and the contact surfaces form flat surfaces inclined at a predetermined angle with each other. When 25 is extended, the connection plate 16 and the fixing metal pushing plate 17 are lowered, and the inclined plane of the fixing fitting 15 and the inclined flat surface inside the fixing fitting pushing plate 17 slide while being in surface contact, and the fixing fitting 15 Is pushed in the axial direction, advances toward the axial center, and fits into the pin fitting groove 24 of the male joint 11 as shown in FIG.

  Thus, in a state where the fixing fitting 15 is fitted in the pin fitting groove 24 of the male joint 11, the fixing fitting 15 is connected to the flat plate portion parallel to the axis of the side opposite to the axis of the fixing fitting 15 and the connection plate 16. Since the pair of left and right fixing metal pusher plates 17 connected to the flat part parallel to the inner axis of the fixing metal pressing plate 17 are in close contact and fixed, the fixing metal 15 does not fit in and out of the pin fitting groove 24 of the male joint 11. The connected state is reliably maintained.

  Further, when the rod 25 of the electric cylinder 18 is contracted, the fixing metal pushing plate 17 is raised, and the fixing metal pushing plate 17 does not push the fixing metal 15 in the axial direction, and the spring 26 provided on the fixing metal 15 is attached. Due to the force, the fixing bracket 15 is retracted in the radial direction opposite to the axial center and is fitted and removed from the pin fitting groove 24 of the male joint 11.

  In FIG. 6, since the fitting between the female joint 14 and the male joint 11 is insufficient, the rod 25 of the electric cylinder 18 is connected when the pin fitting groove 24 is not in the position where the fixing bracket 15 is fitted. For this reason, the fixture 15 is extended and pushed in the axial direction, but the fixture 15 cannot advance in the axial direction, and the connection plate 16 and the fixture push-in plate 17 cannot move downward. However, since the sleeve 28, the spring 19, and the nut 27 are disposed at the tip of the rod 25 of the electric cylinder 18 to support the connecting plate 16, the spring 19 contracts the extension amount of the rod 25 of the electric cylinder 18. Therefore, an excessive load is not applied to the electric cylinder 18 and the mechanism is protected.

  After that, when the fitting between the female joint 14 and the male joint 11 is sufficient, the pin fitting groove 24 comes to the position where the pin fitting groove 24 is fitted into the fixing bracket 15, and the connecting plate 16 is urged by the biasing force of the spring 19 that has contracted. , The fixing bracket pushing plate 17 moves downward, and accordingly, the fixing bracket 15 is pushed in the axial direction so that the fixing bracket 15 advances toward the axial center and is fitted into the pin fitting groove 24.

  FIG. 7 shows a second embodiment of the present invention. The connecting device 9 is fixed to the front end of the output shaft 8 of the rotary drive device 4 by a bolt 12 with a flange 13 positioned above the female joint 14.

  A slip ring 23 for supplying power to the electric cylinder 18 is disposed on the outer periphery of the female joint 14 of the rotating portion, and power is supplied from the lead wire 22 to the electric cylinder 18 from the power cable 20 via the brush 21 and the slip ring 23. .

  A plurality of electric cylinders 18 are suspended from the plane of the flange 13 above the female joint 14, and a sleeve 28 is connected to a connecting plate 16 that connects a pair of left and right fixing metal pressing plates 17 to the tip of a rod 25 of the electric cylinder 18. The spring 19 and the nut 27 are supported so as to be movable in the axial direction of the female joint 14.

  The inner wall of the female joint 14 corresponding to the pin fitting groove 24 formed in the direction perpendicular to the axis of the male joint 11 of the excavating rod 10 inserted into the female joint 14 as the fixing metal pushing plate 17 moves. Further, a pair of left and right fixing brackets 15 are provided so as to be able to advance and retreat so that the inner ends thereof face each other in the direction of the pin fitting groove 24.

  The inside of the fixing metal pushing plate 17 forms a plane inclined at a predetermined angle, and is in surface contact with the side surface of the bar 29 connected to the fixing metal 15 by the pin 30.

  When the rod 25 of the electric cylinder 18 is extended, the inclined flat surface portion of the fixing metal pushing plate 17 is lowered while contacting the side surface of the bar 29, and accordingly the bar 29 and the fixing metal 15 which are connected by inserting the pin 30 are connected. When pressed in the axial direction, the fixture 15 advances toward the axial center and is fitted into the pin fitting groove 24 of the male joint 11.

  Further, when the rod 25 of the electric cylinder 18 is contracted, the connecting plate 16 formed on the inner surface with the pin sliding groove 31 inclined at a predetermined angle rises. Since the pin 30 slides in the pin sliding groove 31 as the connecting plate 16 rises, the fixing metal fitting 15 into which the pin 30 is inserted and connected is retracted in the radial direction opposite to the axial center, so that the male joint 11 from the pin fitting groove 24.

  FIG. 9 shows a state in which the fixing metal pushing plate 17 is lowered and the fixing metal 15 is fitted in the pin fitting groove 24 of the male joint 11. By fixing the side surface of the bar 29 in close contact with the surface 32, the fixed fitting 15 is reliably maintained in the connected state without being fitted or removed from the pin fitting groove 24 of the male joint 11.

  Further, in the first embodiment and the second embodiment, the pin fitting groove 24 of the male joint 11 corresponding to the fixing bracket 15 is opposed and provided with the same phase in the height direction. In excavation when the rotational excavation force applied to 10 is large, the pin fitting groove 24 may be provided with the phase in the height direction shifted.

The side view which shows an example of the excavator to which this invention is applied. As a first embodiment, a partial cross-sectional side view of the connecting device of FIG. AA arrow view of the coupling device in FIG. As a first embodiment, a partial cross-sectional side view of the coupling device of FIG. BB sectional view of the connecting device in FIG. Partial cross-sectional side view of coupling device showing incomplete rod coupling state Partial cross-sectional side view of the coupling device of FIG. CC arrow view of the coupling device in FIG. FIG. 1A is a partial sectional side view of the coupling device of FIG. DD cross-sectional view of the coupling device in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 2 Leader 4 Rotation drive device 8 Output shaft 9 Coupling device 10 Excavation rod 11 Male joint 13 Flange 14 Female joint 15 Fixing bracket 16 Connecting plate 17 Fixing bracket pushing plate 18 Electric cylinder 19 Spring 20 Power cable 21 Brush 22 Lead wire 23 Slip ring 24 Pin fitting groove 25 Rod 26 Spring 27 Nut 28 Sleeve 29 Bar 30 Pin 31 Pin sliding groove 32 Bar fixing surface

Claims (1)

  In an excavator having a female joint that engages a male joint of a drilling rod and connects a drilling rod to an output shaft of a rotary drive device that is supported so as to be movable up and down along a leader standing on a base machine. A slip ring for supplying power to the electric cylinder is arranged on the outer periphery of the female joint, and a plurality of electric cylinders that rotate integrally with the female joint are suspended from the outer periphery of the female joint. A pair of fixed metal pusher plates are supported so as to be movable in the axial direction of the female joint, and can be moved forward and backward in the radial direction in the pin fitting groove of the male joint of the drilling rod inserted into the female joint as the fixed metal pusher plate moves. An excavating rod coupling device in an excavator, wherein the fixing bracket provided is configured to be fitted and removed.

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