JPH0441752B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention is applicable to fluid pipes such as gas pipes and water pipes buried underground, power lines, optical and electric signal lines,
In horizontal hole drilling equipment that excavates relatively small-diameter horizontal holes, such as horizontal holes for constructing pipes that accommodate power lines, etc., or horizontal holes for discharging water, the rotary shaft that is attached to the rotation drive device that rotates the auger and grips the auger. Regarding chuck devices.

(Prior Art) The present inventors have developed the above-mentioned horizontal hole for underground pipes.
We are developing a horizontal hole drilling device that can excavate roads, etc. without digging trenches. An example thereof will be explained with reference to FIGS. 7 and 8.

Reference numeral 1 denotes a casing whose lower part is inserted into a vertical hole B, and an elevating frame 2 is mounted along left and right guide rails 5 provided in the casing 1 via rollers 6 so as to be freely movable up and down. The elevating frame 2 has a portal frame 3 and pins 18 on both sides of the left and right columns of the portal frame 3, respectively.
It consists of a guide frame 4 which is connected and attached so as to be tiltable from a and 18b, and the inclination angle of the guide frame 4 can be adjusted by a turnbuckle (not shown) for adjusting the inclination angle.

A pair of guide rails 10, 10 are fixed to the guide frame 4 in its longitudinal direction, and grooves provided on the outer periphery of guide rollers 11 attached to the four corners of the lower surface of the auger rotation drive device 7 are connected to the guide rails. By fitting into the guide rail 10, the auger rotation drive device 7 is positioned and moved by the guide rail 10.

A traverse hydraulic motor 12 for traversing the auger rotation drive device 7 is installed on the guide frame 4, and a sprocket 13 rotated by the hydraulic motor 12 and a sprocket attached near both ends of the guide frame 4. Chain 17 hung between 15 and 16
is connected to a connecting portion 19 provided on the side of the auger rotation drive device 7, and the hydraulic motor 12 is operated, so that the auger rotation drive device 7 moves laterally along the guide rail 10.

The auger rotation drive device 7 has an auger rotation hydraulic motor 7a and a rotary chuck device 7b, and has a built-in mechanism for operating the rotary chuck device 7b.

A fixed chuck device 14 for adding an auger is attached to the front end of the guide frame 4.
The fixed chuck device 14 includes a pair of left and right hydraulic cylinders 30 and 31 that are pinned to the guide frame 4 in the front-rear direction, and a grip portion 25a of the auger 25 so that the grip portion 25a of the auger 25 can be gripped and released. 25
pawls 26, 27 movably mounted in a direction perpendicular to the axial direction of the hydraulic cylinder 30;
It consists of link mechanisms 21 and 22 that transmit the movement of the piston rod 31 to the claws 26 and 27, respectively,
By expanding and contracting the hydraulic cylinders 30 and 31, the grip portion 25a can be gripped and released.

As the elevating device for the elevating frame 2, a device with an elevating motor mounted on the elevating frame 2 or a hydraulic cylinder can also be used, but in this example, a winch 3 is used as shown in FIG.
An example using 4 is shown below. That is, 33 is a ring-shaped stand installed on the casing 1, and on the stand 33 are installed a winch 34 for raising and lowering the elevating frame 2 via a wire rope 20, an operation panel 23, and the transverse hydraulic motor 12. It is equipped with an operating lever 24, a hydraulic device 28 such as a valve, and a control panel 29. Further, the frame 33 has a guide rail 5A continuous to the guide rail 5.

This device can be used in the following manner, for example, when excavating a side hole for arranging a branch pipe for an existing buried pipe A. With the elevating frame 2 raised to the top and the rotary drive device 7 in the retracted position, the most advanced auger 25 (which has a sharp tip at the tip and is removably screwed together) is moved to the rotary chuck device 7b. After the winch 34 is installed in the lower part, the winch 34 is operated in the lowering direction, and a locking piece (not shown) attached to the portal frame 3 comes into contact with a stopper (not shown) attached to the lower part of the guide rail 5 and is locked. Lower the elevator frame 2 until the

Next, the hydraulic motor 12 is operated so that the rotary drive device 7 moves forward, and the hydraulic motor 7a of the rotary drive device 7 is operated in the excavation direction (clockwise rotation) to excavate the horizontal hole. In this case, the excavated soil is in the vertical hole B
discharged inside. After moving the rotary drive device 7 forward to the frontmost position, the auger 25 is removed from the rotary chuck device 7b, the hydraulic motor 12 is reversed, the rotary drive device 7 is moved backward, and the lifting frame 2 is moved to the winch 34.
Pull it up. Then, the second auger 25 is attached to the rotary chuck device 7b on the ground, and the elevating frame 2
By lowering the leading auger 25, gripping the grip portion 25a of the leading auger 25 by the fixed chuck device 14, and moving the rotary drive device 7 forward and operating it in the excavation direction (rotating clockwise), the trailing auger 25 is lowered. The male threaded portion at the tip of the auger 25 is screwed into the female threaded portion at the tail end of the auger 25. Then, excavation is performed in the same manner as above.
In this case, if the elevating frame 2 is provided with a storage device and a replenishing device for the auger 25, the auger can be added to the elevating frame 2 and excavation can be performed while the elevating frame 2 is installed underground. Repeat this operation to drill a horizontal hole.

Moreover, when pulling out the auger 25, by connecting the newly installed pipe to the auger 25 at the tip and pulling it out, the newly installed pipe connected to the existing pipe A can be inserted into the side hole. Note that 32 is an auger guide attached to the opening 9 of the casing 1 to prevent collapse of the hole entrance.

A conventional rotary drive device 7 provided in this horizontal hole drilling device was constructed as shown in FIG. Reference numeral 35 denotes a truck to which the guide roller 11 is attached, and a case 36 of the rotary chuck device 7b is bolted to the truck 35. A mounting frame 37 for the hydraulic motor 7a is bolted onto the case 36, and the auger rotation hydraulic motor 7a is fixed to the mounting frame 37 with bolts 38. A cylindrical body 39 whose rear end flange 39a is removably fixed to the case 37 with bolts (not shown) is concentrically inserted into the case 37, and the flange 39a of the cylindrical body 39 is Attach a cylindrical end member 41 with bolts 40, and fit a cylinder 43 into the end member 41 rotatably via an oil supply passage forming cylinder 42 and via an appropriate seal 44, One end of a piston rod 46 is connected to the inserted chuck claw opening/closing cylinder 43 and the piston 45 slidably housed in the cylinder 43, and the front end of the cylinder 43 has a
A cylindrical body 48 which is rotatably fitted into the cylindrical body 39 via a bearing 47 and into which a piston rod 46 is slidably fitted is screwed 49, and a set screw 50 is inserted into the threaded portion 49. A disk portion 51 and a large-diameter cylindrical portion 52 are integrally provided at the front end of the cylindrical body 48, and a ring-shaped bearing member 64 is attached to the large-diameter cylindrical portion 52 at the front of the case 36. A receiver gear 54 that meshes with the output gear 53 of the motor 7a is fixed to the disk portion 51 with bolts 55, and three enlarged bottom grooves 56 are formed on the front surface of the large diameter cylindrical portion 52. A circular block 57 formed radially is fixed with bolts 62, a sliding block 63 is slidably fitted into each of the enlarged bottom grooves 56, and a chuck pawl 58 is attached to each sliding block 63 with a bolt 59. A frustoconical block 60 is connected to the piston rod 46, and the block 60 is connected to the large diameter cylindrical portion 52.
The sliding block 63 is slidably fitted into the slanted widened groove 61 formed around the block 60.
The inner diameter engaging portion 63a is slidably fitted thereto.
Therefore, if hydraulic oil is supplied into the cylinder 43 so that the piston 45 moves to the right, the sliding block 63
The auger 25 is moved toward the center of rotation so that the chuck claw 58 can grip the grip portion 25a of the auger 25.

However, in this conventional rotary drive device,
The cylinder 43 and the cylindrical body 48 into which the piston rod 46 is slidably fitted are connected by the threaded part 49 and are prevented from rotating by the set screw 50.
In a certain direction (for example, the forward rotation direction during excavation), the two are twisted relative to each other in the direction that strengthens the connection, but when the connection is reversed, such as when untying an auger connection, the force that loosens the connection is The threaded part 49 loosens over time, and the locking screw 50
There was a problem that pressure loss occurred at the tip, causing play. In addition, there was a problem in that the seal 44 was damaged due to play, causing oil leakage. Moreover, due to the occurrence of this backlash, the rotary chuck device 7
The axis of b is not constant, and the claw 58 or auger 25
There was a problem in that it rotated while swinging. Furthermore, there was a problem in that it was difficult to assemble, disassemble, and inspect the detent.

(Problems to be Solved by the Invention) In view of the above-mentioned problems, the present invention seeks to provide an auger rotation drive device that does not cause rattling or rocking of the rotary chuck device and is advantageous in terms of maintenance and inspection. It is something to do.

(Means for Solving the Problems) In order to achieve this object, the present invention provides a rotary chuck device which is movably mounted on a guide frame of a horizontal hole drilling device installed in a vertical hole and which grips a screw auger. In the auger rotation drive device, the rotary chuck device includes a case, and a cylindrical body that is inserted concentrically into the case and whose rear end flange is detachably fixed to the case with bolts. , a chuck pawl that is rotatably inserted into the cylindrical body and the cylindrical end member bolted to the rear end of the cylindrical body, and is integrally provided with a portion into which a piston rod is slidably fitted. An opening/closing cylinder,
a receiving gear fitted to a portion of the cylinder protruding forward from the cylindrical body via a rotation prevention piece; and a cylinder made of a wear-resistant metal that is integrally provided in front of the receiving gear and is attached to the case. a rotary cylindrical part that is rotatably fitted through a shaped metal bearing, and into which a block attached to the front end of the piston rod of the cylinder is slidably fitted; A plurality of chuck claws freely and slidably engaged with an inclined guide portion provided on the block are screwed into a male thread groove formed on the outer periphery of the front end portion of the cylindrical body. It consists of a nut that prevents the receiving gear from coming off and is bent and fitted into a groove provided on the outer periphery of a locking piece that is integral with the rotation preventing piece of the receiving gear, and a motor for rotating the auger is mounted on the upper part of the case. The output gear driven by the motor is detachably mounted, and the output gear driven by the motor is brought into engagement with the receiving gear by facing into the case through the upper opening of the case, and when the motor is removed from the case, the rotary chuck device The internal parts of the case are configured so that they can be pulled out rearward as a whole by removing bolts that fix the flange to the case.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 6. In FIGS. 1 to 6, the same reference numerals as in FIGS. 7 to 9 indicate members having equivalent functions. Case 3 of rotary chuck device 7b
A cylindrical body 39 is concentrically inserted into the case 36A as in the conventional example, and a flange 39a at the rear end of the cylindrical body 39 is removably fixed to the case 36A with bolts 65. (See Figures 2 and 5).
A cylindrical end member 41A and an end plate 41B are fixed to the rear end of the cylindrical body 39A with bolts 40. The chuck claw opening/closing cylinder 66 is rotatably fitted into the cylindrical end member 41A via the sealing material 44, and the end plate 67 of the cylinder 66 is rotatably fitted into the end plate 41B via a metal bearing 69. Supported. Furthermore, in the present invention,
A portion a into which the piston 45 is slidably fitted and a portion b into which the piston rod 46 is slidably fitted are integrally constructed.

Further, a receiving gear 71 made of a bevel gear is fitted into a portion of the cylinder 66 that protrudes forward from the cylindrical body 39 via a rotation prevention piece 70. In addition, in order to fix the receiving gear 71, as shown in FIGS. 1 and 6, a ring-shaped locking piece 72 fixed to the detent piece 70 is fitted near the front end of the b portion of the cylinder 66, A nut 73 is attached to the male thread at the front end of the cylinder 66.
The nut 73 is prevented from rotating by screwing into the nut 73 and tightening and fixing the receiving gear 71, and bending and fitting the protrusion 72a provided around the anti-rotation piece 72 into the groove 73a provided on the outer periphery of the nut 73. The receiving gear 71 is prevented from coming off and rattling is prevented.

Further, a rotating cylindrical portion 71a is integrally provided on the front surface of the receiving gear 71, and a cylindrical metal 74 made of a wear-resistant metal is fitted around the rotating cylindrical portion 71a,
The case 36A extends forward so as to be fitted with the entire surface of the metal 74, realizing a metal bearing structure in which the case 36A supports the rotating part over a longer range than in the past. A block 60 attached to the front end of the piston rod 46 is attached to the rotating cylindrical portion 71a.
is fitted inside so that it can slide freely. In addition, the rotating cylindrical part 7
As shown in FIG. 4, on the front surface of the block 1a, there are a plurality of sliding slides that are movable radially and whose inner ends 63a are slidably engaged with inclined guide portions such as grooves 61 provided in the block 60. Blocks 63 and chuck claws 58 fixed to each block 63 with bolts 59
and has.

Furthermore, a mounting frame 37 for the hydraulic motor 7a is removably fixed to the upper part of the case 36A with bolts 75 (see FIGS. 2 and 3), and the auger rotation hydraulic motor 7a is bolted to the mounting frame 37. 38
It is fixed in a removable manner. Moreover, the motor 7
The output gear 53 driven by a is connected to the case 3
The motor 7a is made to face into the case 36A from the top opening 76 of the 6A and mesh with the receiving gear 71.
When the rotary chuck device is removed from the case 36A together with the output gear 53, the parts inside the case (cylindrical body 39, end member 41A,
The cylinder 66 and its internal parts, the gear 71, the sliding block 57 and the pawl 58 attached thereto) are as follows:
By removing the bolts 65 that fixed the flange 39a to the case 36A, the flange 39a can be pulled out rearward as a unit.

Although the present invention has been described above with reference to embodiments, the present invention can also be applied to installation in a vertical hole such as an existing manhole in a stationary or lifting type, or to automatic excavation. , combinations, etc., various changes and additions can be made without departing from the gist of the present invention.

(Effects of the Invention) As described above, in the present invention, the piston accommodating portion of the cylinder that opens and closes the chuck pawl is configured integrally with the piston rod accommodating portion, and the receiving gear is fitted into the cylinder via the anti-rotation piece. In addition, the locking piece integrated with the detent piece was fixed by fitting into the groove provided on the outer periphery of the nut screwed onto the front end of the cylinder, so that the entire rotating part was prevented from wobbling. This prevents damage to the sealing material and prevents oil leakage due to leakage. Moreover, the receiving gear is firmly connected to the cylinder by the receiving gear rotation prevention mechanism using the above-mentioned rotation prevention piece, locking piece, and nut, and the rotating part is supported by the case via the cylindrical metal bearing. Therefore, the rotating part is stably supported, chuck pawls etc. are prevented from swinging, and the auger is gripped by the rotary chuck device with good positional accuracy.

Furthermore, since the rotating part inside the case can be pulled out as a whole, assembly, disassembly, and maintenance/inspection work can be easily performed.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of a rotary drive device according to the present invention, FIG. 2 is a side view of the embodiment, FIG. 3 is a plan view of the embodiment, and FIG. 4 is a diagram of the embodiment. A front view of the chuck pawl portion, FIG. 5 is a rear view of the embodiment, FIG. 6 is a perspective view illustrating the receiving gear rotation prevention mechanism of the embodiment, and FIG. 7 is a horizontal hole drilling device to which the present invention is applied. FIG. 8 is a longitudinal cross-sectional view showing an example of the rotary drive device, FIG. 8 is a cross-sectional view thereof, and FIG. 9 is a vertical cross-sectional view showing a conventional rotary drive device.

Claims (1)

[Claims] 1. In an auger rotation drive device that is movably mounted on the guide frame of a horizontal hole drilling device installed in a vertical hole and has a rotary chuck device for gripping a screw auger, the rotary chuck device is connected to a case and a rotary chuck device inside the case. a cylindrical body which is inserted concentrically into the case and whose rear end flange is removably fixed to the case with a bolt; the cylindrical body and a cylinder bolted to the rear end of the cylindrical body; A chuck pawl opening/closing cylinder which is rotatably mounted in a shaped end member and has an integral part in which a piston rod is slidably fitted; a receiving gear fitted through a stopper; and a receiving gear provided integrally in front of the receiving gear and rotatably fitted to the case via a cylindrical metal bearing made of a wear-resistant metal; A rotating cylindrical part in which a block attached to the front end of the piston rod of the cylinder is slidably fitted; A plurality of freely engaged chuck pawls are screwed into a male thread groove formed on the outer periphery of the front end of the cylindrical body, thereby preventing the receiving gear from slipping out and preventing the receiving gear from rotating. The auger rotation motor is removably attached to the upper part of the case, and the output gear driven by the motor is attached to the case. When the rotary chuck device faces into the case through the upper opening and is engaged with the receiving gear, and the motor is removed from the case, the internal parts of the case of the rotary chuck device fix the flange to the case. A rotary chuck device for a horizontal hole drilling device, characterized in that it can be pulled out rearward by removing a bolt.