JPH0332619Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is applicable to fluid pipes such as gas pipes and water pipes buried underground, power lines, light 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 inventors of the present invention 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. 5 and 6.

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 motors 30 and 31 pinned to the guide frame 4 in the front-back direction, and a grip portion 25a of the auger 25 so that it can grip and release the auger 25. pawls 26, 27 movably mounted in a direction perpendicular to the axial direction of the hydraulic cylinders 30, 3;
It consists of link mechanisms 21 and 22 that transmit the movement of the piston rod 1 to claws 26 and 27, respectively, and 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 mounted a winch 34 for raising and lowering the elevating frame 2 via a wire rope 20, an operation panel 23, and the traversing 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 (with a sharp tip at the tip removably screwed together) is connected to the rotary chuck device. After installing on 7b, winch 34
is operated in the lowering direction, and the lifting frame 2 is lowered until 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. let

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 advancing the rotary drive device 7 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 gripping 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 supplementing 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 36 with bolts (not shown) is concentrically inserted into the case 36, and the flange 39a of the cylindrical body 39 is , a cylindrical end member 41 is attached with a bolt 40, and a cylinder 4 for forming an oil supply path is installed inside the cylindrical end member 41.
The cylinder 43 is fitted rotatably through the cylinder 2 and through an appropriate seal 44, and the cylinder 43 for opening and closing the chuck claw is inserted into the cylinder 43, and the piston 45 is slidably housed in the cylinder 43. A cylindrical body 48 is connected to one end of the piston rod 46, and is rotatably fitted into the cylindrical body 39 via a bearing 47 at the front end of the cylinder 43, and into which the piston rod 46 is slidably fitted. are screwed together 49, and a set screw 50 is attached to the screwed part 49, and the cylindrical body 4 is
A disk portion 51 and a large-diameter cylindrical portion 52 are integrally provided at the front end of the case 8 , and the large-diameter cylindrical portion 52 is fitted into the front portion of the case 36 via a ring-shaped bearing member 64 . A receiving gear 54 that meshes with the output gear 53 of the motor 7a is fixed to the disc portion 51 with bolts 55,
A cylindrical block 57 in which three enlarged bottom grooves 56 are formed radially is fixed to the front surface of the large diameter cylindrical part 52 with bolts 62, and a sliding block 63 is fixed to each enlarged bottom groove 56.
A chuck pawl 58 is attached to each sliding block 63 with a bolt 59, while a conical block 60 is connected to the piston rod 46, and the conical block 60 is connected to the large diameter cylindrical shape. The conical block 6 is slidably fitted within the section 52.
An engaging portion 63a on the inner diameter side of the sliding block 63 is slidably fitted into an inclined wide-bottomed groove 61 formed around the sliding block 63. Therefore, if hydraulic oil is supplied into the cylinder 43 so that the piston 45 moves to the right, the sliding block 63 moves toward the center of rotation and grips the grip portion 25a of the auger 25 with the chuck pawl 58. The structure allows for

However, when drilling a hole using a horizontal hole drilling device, groundwater often leaks out, and as a result, the excavated earth and sand turns into mud and enters the cylindrical block 57, causing the inclined groove 61 and the engaging portion 63a. When the chuck pawl 58 gets into the sliding surface and dries after use, particles such as sand become a hindrance to the sliding movement, making it impossible to open and close the chuck pawl 58.

(Problems to be solved by the invention) In view of the above-mentioned problems, the present invention prevents muddy water from entering the sliding surface between the engaging part of the sliding block and the inclined groove, and ensures that the chuck pawl always runs smoothly. The object of the present invention is to provide a rotary chuck device that can be opened and closed.

(Means for Solving the Problems) In order to achieve this objective, the present invention is attached to an auger rotation drive device movably mounted on the guide frame of a horizontal hole drilling device installed in a vertical hole, and the screw In a rotary chuck device for gripping an auger, a cylindrical block having a plurality of radial grooves is attached to the front surface of a rotating cylindrical body rotated by an auger rotation motor, and a sliding block is fitted into each groove, A chuck pawl is provided on the front surface of each sliding block, a conical block is mounted inside the rotating cylinder so as to be slid back and forth by a cylinder for opening and closing the chuck pawl, and a plurality of chuck pawls are formed on the circumferential surface of the conical block. The engaging part of the inner end of the sliding block is slidably fitted into the inclined groove of the cylindrical block, and a cover is attached to the front surface of the cylindrical block to cover the front opening of the cylindrical block.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. In FIGS. 1 to 4, the same reference numerals as in FIGS. 5 to 7 indicate members having equivalent functions. As shown in FIGS. 1 to 4, the output gear 5 is driven by the auger rotation motor 7a.
3 and the receiving gear 71, a plurality of radially arranged cylinders (3
A cylindrical block 57 with T-shaped grooves 56 formed therein.
are attached with bolts 62, and a T-shaped sliding block 63 is fitted into each groove 56.
Attach chuck claws 58 to bolts 59 on the front of 3.
The piston rod 46 is connected to the tip of the piston rod 46 of the chuck claw opening/closing cylinder 66 in the rotating cylindrical body 71a.
A conical block 60 that slides back and forth is attached. The circumferential surface of the conical block 60 has a plurality of (3
T-shaped oblique grooves 61 each having a T-shaped cross section are provided, and a T-shaped engaging portion 63a at the inner end of the sliding block 63 is slidably fitted into each oblique groove 61.

Therefore, in the present invention, a cover 78 covering the front opening 77 of the cylindrical block 57 is attached to the front surface of the cylindrical block 57 with bolts 79.

Further, in this embodiment, the front surface of the sliding block 63 is aligned with the front surface of the cylindrical block 57 so that the opening 77 can be sealed regardless of the opening/closing operation of the chuck pawl 58.
The opening 77 is closed over the entire opening/closing range. In the illustrated example, as shown enlarged in FIGS. 2 and 3, each sliding block 63
By providing an extending piece 63b equal to the width of the groove 56 on the inner surface of the front surface (rotation center side), the cover 78 can be secured even when the chuck pawl 58 is in the most open state (the state shown in FIGS. 1 to 3). The opening 77 is maintained in a closed state in contact with the front surface of the extending piece 63b. In addition, a cover 7 is attached to the rear end of the inner surface of the chuck pawl 58 so that the chuck pawl 58 does not come into contact with the cover 78 when the chuck pawl 58 closes.
A notch 58a slightly wider than 8 is formed in the radial direction.

The sliding block 63 is also provided with an oil supply hole 80 for supplying lubricating oil to the sliding part between the inclined groove 61 of the conical block 60 and the engaging part 63a of the sliding block 63. , a blind plug 81 is provided to close the entrance of the oil supply hole 80. If lubricating oil is supplied through the oil supply hole 80, the effect of preventing dust, dirt, etc. from entering the sliding portion is further improved.

In this embodiment, the chuck pawl opening/closing cylinder 66 is formed integrally with the piston 45 accommodating part a and the piston rod 46 accommodating part b, and the receiving gear 7 meshes with the output gear 53 of the hydraulic motor 7a.
1 is fitted to the front end of the piston rod accommodating portion b of the cylinder 66 via the detent piece 70, and the protrusion 72a around the ring-shaped locking piece 72 that is integrated with the detent piece 70 is fitted to the front end of the cylinder 66. By bending and fitting into the groove 73a around the screwed nut 73, the nut 73 is prevented from turning, and the receiving gear 71
is firmly fixed to the cylinder 66, thereby eliminating the backlash that occurs in the conventional case.

Further, the receiving gear 71 and the rotating cylindrical body 71a
Since the rotating cylindrical body 71a is supported by a bearing using a cylindrical metal 74, a more stable rotational state can be obtained than in the past, and the occurrence of rocking of the rotating part can be prevented. .

Additionally, a hydraulic motor 7 is mounted on the upper part of the case 36A.
The mounting frame 37 of a is removably fixed with bolts (not shown), the auger rotation hydraulic motor 7a is removably fixed to the mounting frame 37 with bolts 38, and the output gear 53 is driven by the motor 7a. faces into the case 36A through the upper opening 76 of the case 36A and meshes with the receiving gear 71, and when the motor 7a and the output gear 53 are removed from the case 36A, the case of the rotary chuck device Internal parts (cylindrical body 3
9. Remove the bolts 65 that fixed the flange 39a to the case 36A. As a result, the carriage 35 can be pulled out rearward as a unit, and maintenance and inspection of the interior can be performed without removing the carriage 35 from the guide frame 4.

Although the present invention has been explained above with reference to examples, 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, since a cover is provided to close the opening of the cylindrical block of the rotary chuck device, the sliding portion between the sliding block and the conical block is closed. Prevents mud from entering
The chuck claw can be opened and closed smoothly even when working after working in a place where groundwater is present.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a rotary chuck device according to the present invention, FIG. 2 is an enlarged sectional view of the main part of the embodiment, FIG. 3 is a front view of FIG. 2, and FIG. 2 is a plan view, FIG. 5 is a vertical cross-sectional view showing an example of a horizontal hole drilling device to which the present invention is applied, FIG. 6 is a cross-sectional view thereof, and FIG. 7 is a vertical cross-sectional view showing a conventional rotary drive device. It is.

Claims (1)

[Scope of utility model registration request] In a rotary chuck device that grips a screw auger and is attached to an auger rotation drive device movably mounted on a guide frame of a horizontal hole drilling device installed in a vertical hole, a rotary cylindrical body rotated by an auger rotation motor is used. A cylindrical block having a plurality of radial grooves is attached to the front surface, a sliding block is fitted into each of the grooves, a chuck pawl is provided on the front surface of each sliding block, and a chuck pawl is provided in the rotating cylindrical body. A conical block is mounted so as to be slid back and forth by an opening/closing cylinder, and the engaging portion at the inner end of the sliding block is slidably fitted into a plurality of inclined grooves formed on the circumferential surface of the conical block. A rotary chuck device having a cover, characterized in that a cover for covering a front opening of the cylindrical block is attached to the front surface of the cylindrical block.