JPH03290585A - Directional control type cluster downhaul drilling machine - Google Patents

Abstract

PURPOSE:To facilitate the extent of control over a drilling machine by assembling a drill cluster in a circular case, and installing a drilling direction control mechanism, provided with a drill cluster driver, a fluid feeding means and a fluid inlet means, in the rear. CONSTITUTION:A drilling machine is assembled in a drill cluster circular case 100 made up of an outer circumferential drill 1A and a center drill 1C, and in the rear part, there are provided a drill cluster driver 124 and a drilling direction controller 120. Then, this drilling direction controller 120 is separately formed in these drills 1A, 1C with a fluid compounding means 102 with both pressure fluid feeding passages 107, 108 and a fluid feeding means 121 capable of rotation and movement to this center shaft and a fluid inlet means 122. Next, the fluid feeding means is made into a mechanism which selectively occupies an interval between a first position separated as far as the specified distance from the fluid inlet means 122 and a second position in contact with this first position, through which directional control over the drilling machine is thus facilitated.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention is applicable to - underground drilling equipment for boat fishing; The present invention relates to a digging direction control device for a hole digging device.

[Prior Art] Downhole drills having a plurality of drills in underground drilling equipment are disclosed, for example, in U.S. Pat.
No. 3.682.258 and No. 4.729.439. The cluster drill disclosed in these patents consists of a central drill and a plurality of peripheral drills surrounding it, each drill having its rear end attached to a common support plate. , is supplied through a hollow rod connected to the center of the common support plate and is arranged to be evenly distributed to each drill within the common support plate. While rotating the cluster downhole drill configured in this way.

Operated by pressurized fluid, it pushes forward and drills holes.

Therefore, if the geological conditions to be drilled are uniform, the straightness of the downhole drill allows the drill to move straight toward the target point.

In areas where the geological conditions change and are not uniform, errors occur in the drilling direction.

According to the cluster drill of the above-mentioned patent, the straightness of drilling is guaranteed to some extent, but the direction of drilling is largely influenced by the quality of the ground to be drilled. Therefore, in the case of burying pipes, etc., there has been a desire for a device that can drill holes with high precision at a target point in one step, regardless of the quality of the ground.

[Problem to be solved by the invention] A means to arbitrarily control the direction of advance of a drilling drill so that a highly accurate hole can be drilled at a target point in one step regardless of the quality of the ground has been discovered and put to practical use. In order to achieve this, the control means is capable of controlling the traveling direction of the entire Krasph downhole drill by changing the drilling force of each drill with a simple operation, rather than changing the traveling direction of the entire Clasp downhole drill by a mechanical external force. It is desirable to do so. Since each peripheral drill operates while rotating with respect to the overall central axis, the dead force changes as the angular position of each peripheral drill changes.However, if we look at a specific angular position, each Peripheral drills must also operate under dead power,
In addition, since it is not always necessary for the drilling force of each peripheral drill to change, it is now possible to operate in both an operation mode in which the drilling force of the peripheral drill changes and an operation mode in which the drilling force does not change. It is necessary that the

The present invention aims to solve the above-mentioned problems and to provide a class Fuglan hole drilling machine that can control the advancing direction of the drill by controlling the supply conditions of pressure fluid to each downhole drill. .

[Means for Solving the Problems] According to the present invention, the above objects include a drill assembly including a plurality of downhole drills in a cylindrical drill case, and a drill assembly drive device at the rear end of the drill assembly. A drilling machine is configured by attaching a drill aggregate drive unit to a pressurized fluid supply device capable of axial and rotational movement of the drill assembly drive unit, and independently connecting each of a plurality of downhole drills. a fluid distribution means having a pressure fluid passage communicating therewith; a fluid supply means having a plurality of fluid delivery ports for supplying fluid at different pressure flow rates to each of the pressure fluid passages; fluid introduction for allowing fluid delivered from the fluid supply means to be supplied to each pressure fluid passage of the fluid distribution means when a plurality of downhole drill assemblies are rotating relative to the fluid supply means; and the fluid supply means selectively moves between a first position separated from the fluid introduction means by a predetermined distance and a second position in actual contact with the fluid introduction means. The purpose can be achieved by configuring it so that it can be occupied.

In one embodiment of the invention, a drilling machine includes a drill assembly including a plurality of downhole drills within a cylindrical drill case, a drill assembly drive mounted at the rear end of the drill assembly, and a pressurized fluid supply. an end plate located at one end of the drill loosing for receiving the backhead of each downhole drill and having a pressure fluid passage extending from the end face individually communicating with each downhole drill; and an end plate fixed to the end plate. a cylindrical drive rod head attached to the front end of the drive rod head and constituting a front end of a drill assembly drive mechanism for axially and rotationally driving the drill assembly; a pressure fluid introduction plate fixedly joined to the plate and having a pressure fluid introduction chamber individually corresponding to each said pressure fluid passageway of said end plate; and slidably and rotatably inserted into said drive rod head and retracted. an elongated pressure fluid supply tube having a front end that can be selectively assumed between a first position when moving forward and a second position when moving forward; A plate-shaped lid is formed having a plurality of pressure fluid channels having an outlet provided at a position corresponding to the position of the chamber of the pressure fluid introduction plate, and the configuration of the plurality of pressure fluid channels is two orthogonal lines. symmetrical about one side of the diameter.

The pressure fluid supply control pipe is arranged asymmetrically with respect to the other diameter, and when the pressure fluid supply control pipe is in the first position, the pressure fluid supply control pipe is arranged between the pressure fluid introduction plate and the front end of the pressure fluid supply control pipe. creating a space sufficient to mix the pressure fluid delivered from each pressure fluid passageway of the supply control tube, and in the second position the pressure fluid introduction plate and the front end of the pressure fluid supply control tube substantially A directionally controlled grand hole cluster drilling device is provided which is characterized by top contact.

[Function] In the present invention, since the pressure fluid supply device and the drill assembly drive device are separated, the relationship between the plurality of fluid delivery ports of the fluid supply means and the pressure fluid passages of the plurality of downhole drills is fixed. It is now possible to flow fluid between different fluid outlets and the downhole drill's pressure fluid passages without having to do so.

When the fluid supply means assumes a first position away from the fluid introduction means, each of the outlet ports of the fluid supply means delivers fluid at a different pressure flow rate so that it does not enter the pressure fluid passageway of a particular drill. The pressure flow from the outlet is averaged and almost uniformly enters each pressure flow (,*) passage, and as the drill assembly and fluid supply device rotate relative to each other, the fluid is
The function is similar to that of a conventional excavator in which both parts are fixed and rotate.

When the fluid supply means assumes a second position in which it substantially contacts the fluid introduction means, each passage of the pressure fluid passage in the end plate and each passage of the fluid supply means due to the fluid introduction means interposed between the means. Even though the outlets are not directly facing or partially overlapping, the fluid exiting each outlet does in fact enter a separate pressure fluid passageway. Each outlet of the fluid supply means of the present invention delivers fluid at a different pressure flow rate. Therefore, if the drill assembly is rotating relative to the fluid supply means, if we look at a particular drill, the amount of fluid it receives will change each time the outlet of the opposing fluid supply means changes during the rotation process. The pressure flow rate will change. That is, when viewed from the outlet of the fluid supply means, the pressure and flow rate of the fluid received by the drill changes depending on the position of each outlet, and the digging force changes accordingly. If the shape of the outlet of the fluid supply means is determined so that the change in digging force is such that, when viewed in the cross section of the fluid supply means, the upper digging force is larger than the lower digging force, the drilling machine will change course.

Therefore, at first, the fluid supply means is set to the first position and digging is carried out in a straight line while measuring the excavation course, and when it is detected that the course is about to curve midway, the fluid supply means is set to the second position. The correct course of the excavator can be maintained by simultaneously rotating the fluid supply means to an angular position that allows the course to be corrected.

[Embodiment] Referring to FIG. 1, the main parts of a cluster drill excavator incorporating a drilling direction control means according to the present invention are shown. An outer cylindrical case 1 in which an outer periphery drill IA and a central drill LC each having an outer periphery drill bit 8A and a central drill bit 8C have a disc-shaped key plate 101 at the lower end.
It is assembled in 00. At the other end of the case 100 is an end plate 102 modified according to the invention that receives the backhead 3A, 3C, which is the working fluid introduction end of the drill IA, Ic. The end plate 102 has a tapered hole 104 that receives the back head 3A of each drill, and a pressure fluid supply passage 108 of the same shape that communicates with each hole 104 corresponding to the outer drill IA is connected to the hole 104 from the top surface of the end plate 102.
It is growing up to. The inlet of each pressure fluid supply passage 108 is
They are arranged at equal intervals on a circumference concentric with the tapered hole of the central drill 3C, radially inside the tapered hole 104 of the outer drill IA.

The back head 3C of the central drill 1C is the outer drill IA.
It is shorter than the back head 3A of , and a passage for pressure fluid penetrates upward in the center. The tapered portion 106 of the back head 3C ends at approximately the center of the thickness of the end plate, and at the tip of the tapered portion is a short cylindrical portion 107 with a thread cut on the outer periphery.
The cylindrical portion 107 extends into a hole 109 extending from the upper surface to the position where the upper end of the tapered portion 106 of the back head 3C stops at the center of the end plate 102. Fit the attached nut 110 to fix the back head 3C. The top surface of nut 110 is essentially flush with the top surface of end@102.

An excavation direction control mechanism, generally designated 102, is attached to the upper surface of the end wt102 by bolting.

The drilling direction control mechanism 102 includes a fan-shaped peripheral chamber 123A and a circular central chamber 1 that communicate with each drill.
23C, and is arranged so that each chamber overlaps the inlet of the pressure fluid supply passage 108 of the end plate 102, and one end holds the introduction plate 122, and the pressure fluid supply control pipe 121 is held in the end plate 102. The drive rod head 124 slidably includes a drive rod head 124. A drive rod connecting pipe 125 is fixedly connected to the drive rod head in a known manner.

Drive rod head 124 is generally hollow cylindrical with a flange 126 at its forward end. The inner diameter of the front end of the head is
A deep counterbore is provided to receive the pressure fluid introduction plate 122. The surface of the pressure fluid introduction plate 122 is adjusted to be in the same plane as the surface of the flange 126 of the drive rod head 124. The drive rod head 124 includes a reduced diameter annular projection 127 at the inner diameter of the rearward end forming shoulders 128 and 129. A drive rod connecting pipe 125 is provided at the outer diameter portion of the rear end of the drive rod head 124.
A receiving shoulder 130 is provided.

The pressure fluid supply control pipe 121 has at least 63 pressure fluid distribution passages at the front end, in this embodiment, six passages 111a to 111f on the periphery and one passage 111g in the center.
It consists of a front end 131 with a front end 131 (see FIG. 3) and a hollow cylindrical part 132 following it.
3 is formed. The thickness of the forward end 131 is less than the length from the forward end of the hollow cylindrical portion 134 of the drive rod head 124 to the forward shoulder 128 and is slidable and rotatable within the hollow cylindrical portion 134 of the drive rod head 124 using a seal 135. possible to assemble. Pressure fluid supply control pipe 121
When the is pulled rearward, the shoulder 133 of the shoulder 131 of the front end 131 of the pressure fluid supply control pipe 121 joins the front shoulder 128 of the drive rod head, and the front surface of the front end 131 and the rear surface of the pressure fluid introduction plate 122 connect with each other. The gaps between the two are separated by S to form a mixing chamber 137 that equalizes the fluid pressure.

Forward movement of the pressure fluid supply control tube 121 is limited by a stop member 136 provided on the outer diameter of the hollow cylindrical portion 132 of the pressure fluid supply control tube joining the shoulder 129;
At that time, the distance between the front surface of the front end portion 131 and the rear surface of the introduction plate 122 may be small and they may substantially contact each other, but when the pressure fluid supply control pipe 121 rotates relative to the introduction plate 122, the pressure Front surface of fluid supply control pipe 121 and introduction plate 12
The rear surfaces of the two are arranged so that they do not damage each other.

When operating the cluster drill excavator, the drive rod head 124 is given rotational and forward movement via the drive rod connection pipe 125, thereby rotating and advancing the cluster drill assembly.

The pressure fluid supply pipe 121 can be moved forward, backward, and rotated to any angular position by external control.

To explain the operation, in the non-control mode, the pressure fluid supply pipe 121 is retreated to the position shown in FIG.
At this position, it is fixed relative to the drive rod head 124 in the axial direction. At this time, the drive rod head 124 is allowed to rotate relative to the pressure fluid supply control pipe 121, but the pressure fluid supply control pipe 121 is also fixed in the rotation direction with respect to the drive rod head 124, so that both In this uncontrolled mode, the pressure fluid may rotate integrally with the hollow cylindrical portion 1 of the pressure fluid supply control pipe 121.
32 and flows into the mixing chamber 137 at different pressures and flow rates through pressure fluid passages 111a-111g of different flow path resistances in the front end 131. However, since the mixing chamber 137 is large enough to mix fluids of different pressure flow rates entering from each passageway, each chamber 123A of the pressure fluid introduction plate 122.

123c with virtually the same pressure flow rate and each drill operating with the same drilling force. The operation of the drill at this time is
The operation is the same as that of a conventional cluster drill.

Next, in the control mode, the pressure fluid supply control pipe 121
is moved forward, and the pressure fluid introduction plate 122 and the front end portion 131 of the pressure fluid supply control pipe 121 are brought close to each other so that they are substantially in contact with each other. At this time, the pressure fluid supply control pipe 121 is fixed in the axial direction with respect to the drive rod head 124,
Regarding the rotation direction, the absolute position is fixed at a desired angular position, and the drive rod head 124 is connected to the pressure fluid supply control pipe 121.
to be able to rotate around.

In the control mode arrangement, the fluids passing through the pressure fluid passages 111a to 111g having different flow path resistances in the front end 131 of the pressure fluid supply control pipe 121 are not mixed, but flow into the respective chambers of the introduction plate 122 facing each other. 123A,
It is independently supplied to each drill via 123C. 4th A
, B, and C show the pressure fluid supply control pipe 121 in the control mode.
is fixed and the drive rod head 124 and therefore the drill assembly rotate relative to the pressure fluid supply control tube 121. For example, 4th A, B, C
Pressure fluid channels 111a to 111 are installed at the positions shown in the figure.
g, the pressure and flow rate of the pressure fluid to the downhole drill connected to the flow path 111a with the lowest resistance will be maximum, and the pressure and flow rate to the downhole drill connected to the flow paths 111b and 1llf will be the same. The relationship between the pressure and flow rate of the pressure fluid of 0 or more is such that the pressure and flow rate of the pressure fluid to the flow path 111c and 1lle is smaller, and the pressure and flow rate of the pressure fluid to the flow path 111d is minimized. rotates and the 4th A
There is no change even during the transition from the state shown in the figure to the state shown in FIG. 4B.

In this case, a downhole drill with a high pressure and flow rate of pressurized fluid increases the impact pressure, increases the number of impacts, and increases the drilling speed. On the other hand, in a downhole drill where the pressure and flow rate of the pressure fluid on the opposite side is low, the impact pressure is reduced, the number of impacts is reduced, and the drilling speed is reduced. The entire drill assembly drills holes while rotating in the order of FIGS. 4A to 4B and 4C, but the pressure fluid supply control pipe 121 is not rotated and is kept in a constant direction, so The drilling speed on one side (the upper side in FIG. 4) increases. Therefore, the direction of movement of the entire drill assembly can be controlled by appropriately selecting the angular position of the pressure fluid supply control tube 121.

[Effects of the Invention] Since the present invention is configured as described above, it is possible to easily control the digging force of each drill in the downhole drill assembly to vary depending on the angular position with respect to the traveling direction of the drilling machine. Therefore, highly accurate drilling can be performed at the target point in one step regardless of the quality of the ground, which has an extremely large practical effect.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a downhole cluster drill equipped with a one-way drilling control mechanism according to the present invention, and FIG.
3 is a sectional view showing the fluid introduction means taken along line A-A in the figure and seen in the direction of the arrow; FIG. 3 is a sectional view taken along line B-B in FIG. 1 and seen in the direction of the arrow. FIGS. 4A, 4B, and 4C are cross-sectional views illustrating the arrangement of the outlet of the fluid supply means, and FIGS. FIG. 1A, IC--downhole drill, 100- drill case, 102- end plate, 111a to 111g-
Pressure fluid distribution passage, 120--Drilling direction control mechanism, 12
1- Pressure fluid supply control pipe, 122- Pressure fluid introduction plate, 124- Drive rod head.

Claims (1)

[Scope of Claims] 1. A drill assembly including a plurality of downhole drills (1A, 1C) in a cylindrical drill case (100), a drill assembly drive device attached to the rear end of the drill assembly, and A drilling machine comprising a pressure fluid supply device, comprising pressure fluid supply passages (107, 108) located at the rear end of the drill assembly and communicating independently with each of the plurality of downhole drills (1A, 1C). a fluid distribution means (102); and a plurality of fluid delivery ports, which are a main part of the pressure fluid supply device and are arranged along the central axis of the fluid delivery device, each of which can deliver fluid at a different pressure flow rate. a fluid supply means (121) rotatable around a central axis of the fluid distribution means and movable along the central axis, and disposed between the fluid distribution means and the fluid supply means; , whether or not the fluid distribution means is rotated relative to the fluid supply means when the fluid distribution means assumes a position substantially in contact with a face of the fluid delivery port of the fluid supply means; fluid introduction means (122) for individually introducing the fluid delivered from the outlet into each pressure fluid passage of the fluid distribution means, the fluid supply means being at a predetermined distance from the fluid introduction means; 1. A directionally controlled cluster downhole drilling machine, characterized in that it can be selectively set to a first position separated by a distance of 100 mm, and a second position substantially in contact with the fluid introducing means. 2. The fluid distribution means is an end plate (102) receiving a backhead of the plurality of downhole drills.
The drilling machine described in . 3. The drill assembly drive device has a cylindrical drive rod head (124) fixed to the end plate, and the fluid introduction means is attached to the front end of the drive rod head, and the fluid introduction means is attached to each of the end plates. 3. Excavator according to claim 2, comprising a pressure fluid introduction plate (122) having pressure fluid introduction chambers individually corresponding to the pressure fluid passages. 4. The fluid introducing means is integrally attached to the end plate,
3. The excavator according to claim 2, comprising a pressure fluid introduction plate having a pressure fluid introduction chamber corresponding to each said pressure fluid passage. 5. The fluid supply means is inserted into the drive rod head and has a front end that is selectively movable between a first position when retracted and a second position when advanced; an elongated pressure fluid supply pipe (132) rotatable relative to the drive rod head; and a pressure fluid supply pipe integrally formed at the front end of the pressure fluid supply pipe and provided at a position corresponding to the position of the chamber of the pressure fluid introduction plate. 5. The excavator according to claim 3, wherein the excavator is a pressure fluid supply control pipe (121) provided with a plate-shaped lid (131) having a plurality of pressure fluid passages having a plurality of outlets. 6. The plurality of pressure fluid flow paths at the front end of the pressure fluid supply control pipe have flow path resistance that is symmetrical with respect to one of two orthogonal diameters and asymmetrical with respect to the other. drilling machine.