JPH0732204A - Drilling device - Google Patents

Abstract

PURPOSE:To improve the efficiency of a drilling operation by immediately taking out nearly cylindrical remaining chips from a hollow cylindrical tool after the completion of drilling. CONSTITUTION:Nearly cylindrical remaining chips 28 confined in a hollow cylindrical tool 13 by the pressure of fluid in a fluid pipe simultaneously with the completion of drilling are thrusted out from the hollow cylindrical tool 13 through the tip of a push rod 14 by pushing down the push rod 14 located in a hollow drive shaft 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a perforating device for perforating a peripheral wall of a fluid pipe mainly in a water-free state.

[0002]

2. Description of the Related Art A conventional drilling device of this type is a cylindrical casing which is attached to a drilling area of a fluid pipe as a workpiece and defines a closed working space for drilling.
It is composed of a drive shaft screwed into the casing so as to be able to advance and retract in the axial direction and to be rotatable, and a hollow cylindrical drilling tool attached to the tip of the drive shaft.

[0003]

When the peripheral wall of the fluid pipe is perforated by using such a perforating device, the substantially cylindrical residual piece of the peripheral wall that has been cut gradually enters the hollow cylindrical tool during the perforation process. Simultaneously with the completion of drilling, the cylindrical residual piece separated from the peripheral wall is strongly pressed into the hollow cylindrical tool by the fluid pressure in the fluid pipe. The substantially cylindrical residual piece once pushed into the hollow cylindrical tool in this way could no longer be easily taken out from the tool. Therefore, conventionally, it took a long time to remove the residual pieces, which resulted in a reduction in the work efficiency of the perforation.

Therefore, the present invention has been made by paying attention to such a problem, and makes it possible to immediately take out a substantially cylindrical residual piece from the hollow cylindrical tool after the completion of drilling, thereby improving the work efficiency of drilling. Is intended to improve.

[0005]

In order to achieve the above object, according to the present invention, a cylindrical casing mounted in the perforation area of a fluid pipe and defining a closed working space for perforation. A driving shaft axially advanceable and retractable and rotatable in a casing, and a hollow cylindrical drilling tool attached to a tip of the driving shaft, wherein the driving shaft is hollow. At the same time, it is characterized in that a thrust rod capable of protruding beyond the tip of the drilling tool is slidably arranged in the hollow drive shaft.

[0006]

[Operation] Simultaneously with the completion of drilling, the substantially cylindrical residual piece pushed into the hollow cylindrical tool by the fluid pressure in the fluid pipe pushes down the push rod located in the hollow drive shaft, and the tip of the push rod is pushed down. Through the hollow cylindrical tool.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the cylindrical casing 2 of the punching device 1 is rotatable relative to a lower casing 4 which can be fixed to the fluid pipe side via a connecting socket 3 and a hollow drive shaft 5. Upper casing 6 connected so that relative rotation is not possible
It consists of and. In this case, the upper casing 6 is slidably fitted on the lower casing 4, and the lower end of the upper casing 6 is reduced in diameter so as to be in sliding contact with the lower casing 4.

The hollow drive shaft 5 is connected to the upper end of the upper casing 6 and is integrally connected to the handle 8.
Of the hollow shaft 9, a hollow screw 10 integrated with the hollow shaft 9, and a second hollow shaft 11 connected to the lower end of the hollow screw 10. The hollow shafts 9 and 11 are coaxial with each other. It is arranged.

Between the first hollow shaft 9 having the hollow screw 10 and the second hollow shaft 11, a sliding ring 12 which is in sliding contact with the inner peripheral surface of the lower casing 4 is integrally interposed. The sliding ring 12 provides smooth guiding of the hollow drive shaft 5 in the lower casing 4 and seal between the second hollow shaft 11 and the first hollow shaft 9 in the lower casing 4. To achieve.

At the tip of the hollow drive shaft 5, that is, at the lower end of the second hollow shaft 11, a hollow cylindrical tool 1 having a predetermined outer diameter.
3 is attached. Further, a thrust rod 14 having a length longer than the entire length of the hollow drive shaft 5 and the hollow cylindrical tool 13 is slidably inserted into the hollow drive shaft 5. A seal ring 7 is fitted on the outer periphery of the thrust rod 14, and the seal ring 7 exerts a sealing action on the inner peripheral surface of the hollow drive shaft 5 and, at the same time, supports the weight of the thrust rod 14. It produces a frictional force that is possible. In addition, an enlarged diameter portion 15 having an outer diameter larger than the inner diameter of the hollow drive shaft 5 is attached to the upper end of the thrust rod 14.

In the perforating apparatus 1 having the above-described structure, as shown in FIG. 3 in perforating, the upper and lower saddles 19 and 2 each having a pivotally attached portion 17 and a tightening bolt 18 are provided at appropriate positions on the fluid pipe 16 to be perforated.
Connection opening 22 of valve casing 21 secured by
Are connected to each other via the connection socket 3. In this case, the valve casing 21 that is integrally connected to the upper saddle 19
Includes a valve body 24 that can be rotated by a valve rod 23. The valve body 24, the valve casing 21, and the upper saddle 19 are provided.
Each of the through holes 25, 26, and 27 has an inner diameter that allows passage of the hollow cylindrical tool 13 and the second hollow shaft 11. That is, like the lower casing 4, the valve casing 21
The upper saddle 19 defines a closed working space for drilling.

When the hollow drive shaft 5 is rotated in the piercing direction via the handle 8, the hollow drive shaft 5 and the hollow cylindrical tool 13 descend in the axial direction while rotating, and the valve casing 21 and the valve body are rotated. 24, etc. of the respective matched circulation holes 25, 2
Pass 6, 27. When the hollow cylindrical tool 13 reaches the outer peripheral surface of the peripheral wall of the fluid pipe 16, drilling is started.

Thereafter, as shown in FIG. 4, when the hollow cylindrical tool 13 penetrates the peripheral wall of the fluid pipe 16, the operating torque of the handle 8 is sharply reduced, so that the operator can detect the completion of drilling. . At this time, the substantially cylindrical residual piece 28 separated from the peripheral wall of the fluid pipe 16 is pushed into the hollow cylindrical tool 13 by fluid pressure.

Next, as shown in FIG. 5, the handle 8 is reversed to pull up the hollow cylindrical tool 13 and then the valve rod 23
The valve body 24 is rotated to the valve closed position via. Thus
The perforated working space on the side of the branch port 29 is completely shut off from the outside by the valve body 24. Therefore, the punching device 1 can be removed from the valve casing 21 without any problem after the completion of punching.

After the punching device 1 is removed from the valve casing 21, if the expanded diameter portion 15 of the push rod 14 is pushed down, the tip of the push rod 14 causes a substantially cylindrical residual piece 28 to be removed from the inside of the hollow cylindrical tool 13. Extrude to. In this way, the substantially cylindrical residual piece 28 pushed into the hollow cylindrical tool 13 is easily removed.

Incidentally, another fluid pipe is connected to the valve casing 21 after the punching device 1 is removed, or a sealing cap 30 is temporarily attached.

As the hollow cylindrical tool 13 used in the punching device 1 of the present invention, for example, a tool having a structure shown in FIG. 2 can be considered.

The hollow cylindrical tool 13 comprises a hollow cylindrical blade 32 having a cutting edge 31 at its tip, and a cylindrical cover 33 surrounding the blade 32 except for the vicinity of the cutting edge 31 at the tip of the blade 32. . In this case, the cutting edge 31 is formed in the hollow cylindrical blade 32 by two notches 34 provided at intervals of, for example, about 180 °, and the notch 34 forms an outer peripheral surface of the hollow cylindrical blade 32. To the inner peripheral surface and has a greater axial depth than the wall thickness of the workpiece to be drilled. Therefore, the peripheral wall 35 of the notch 34 serves to cut the rake face of the cutting edge 31 into a hollow cylindrical blade 32.
The front end faces 36 of the respective ones form the flanks of the cutting edge 31.

The rake face 35 of the cutting edge 31, that is, the notch 3
The peripheral wall of No. 4 has a predetermined rake angle γ with respect to the generatrix L of the hollow cylindrical tool 32 near the cutting edge 31, and extends substantially linearly toward the bottom of the notch 34. Is gradually curved in an arc shape as it approaches the bottom. The rake face 35 is slightly inclined toward the inside of the hollow cylindrical blade 32 at least near the cutting edge 31. Flank 36 of cutting edge 31
Preferably has a conical surface whose diameter increases toward the tip.

As clearly shown in FIG. 7, the outer peripheral surface 37 near the tip of the hollow cylindrical blade 32 reaches the outer peripheral surface 38 of the cover 33 (in some cases, the outer peripheral surface 38 of the cover 33 is crossed). ) The diameter is conically expanded, and the inner peripheral surface 39 on the tip side of the cover 33 is also correspondingly diameter expanded. Based on this configuration, the hollow cylindrical blade 32 can be perforated with a hole having an inner diameter corresponding to at least the outer diameter of the cover 33.

The hollow cylindrical blade 32 and the cover 33 are integrally connected to each other by inserting a connecting pin (not shown) into appropriate connecting holes 40 and 41 (FIG. 2) or by welding. To be combined.

FIG. 7 shows a state in which the fluid pipe 16 is bored using the hollow cylindrical tool 13. In this case, the linear chips 42 generated by the cutting edge 31 during drilling rise along the rake face 35 of the cutting edge 31, that is, the peripheral wall of the notch 34. At this time, since the rake face 35 of the cutting edge 31 is slightly inclined toward the inside of the hollow cylindrical blade 32 at least in the vicinity of the cutting edge 31, the linear chip 42 moves upward and inward. Moving. Therefore, the linear chips 42 cover the cover 33.
It never splatters outwards due to centrifugal force before reaching.

The linear chips 42, which have risen to some extent and have reached the bottom of the notch 34, spiral along the arcuately curved bottom to form a spiral chip 43. Since the vicinity of the bottom of the notch 34 is already completely surrounded by the cover 33, the spiral chips 43 connected to the remaining piece 28 are reliably captured in the hollow cylindrical blade 32 and the remaining piece 28 is covered. It will have a holding function.

At the same time, the opening on the tip end side of the hollow cylindrical blade 32 is closed by the cylindrical residual piece 28 of the fluid pipe 16 formed by the perforation. This cylindrical residual piece 28 is
After drilling, the water pressure in the fluid pipe 16 pushes it further into the hollow cylindrical blade 32. Therefore, even after the perforation, the cylindrical residual piece 28 does not naturally fall off the hollow cylindrical blade 32, and the linear chips 42 never enter the running water in the fluid pipe 16. The flank 36 of the cutting edge 32 is
As described above, when the conical surface that expands toward the tip is formed, a corresponding conical collar 44 is left at the bottom of the cylindrical residual piece 28, and the residual piece 28 remains inside the blade 32. Never get into a prank.

Although the embodiments have been described above with reference to the drawings, the specific configuration is not limited to these embodiments, and the present invention is applicable even if there are changes and additions without departing from the scope of the present invention. included.

[0027]

According to the present invention, after the completion of drilling, the remaining pieces of the peripheral wall of the fluid pipe pushed into the hollow cylindrical tool can be reliably taken out by a very simple operation of simply pushing down the thrust rod. , The efficiency of drilling work is significantly improved.

[0028]

[Brief description of drawings]

1 is a side view including a partial cross-section of an embodiment of a punching device. FIG.

FIG. 2 is an exploded perspective view of a hollow cylindrical tool used in a punching device.

FIG. 3 is a cross-sectional view showing a punching operation by the punching device.

FIG. 4 is a cross-sectional view showing a punching operation by the punching device.

FIG. 5 is a cross-sectional view showing a punching operation by the punching device.

FIG. 6 is a cross-sectional view and a side view showing a state after completion of perforation.

FIG. 7 is a cross-sectional view showing a punching process using a hollow cylindrical tool.

[Explanation of symbols]

1 Punching device 2 Casing 3 Connection socket 4 Lower casing 5 Hollow drive shaft 6 Upper casing 7 Seal ring 8 Handle 9 First hollow shaft 10 Hollow screw 11 Second hollow shaft 12 Sliding ring 13 Hollow cylinder tool 14 Protrusion Rod 15 Expanded portion 16 Fluid pipe 17 Pivoting portion 18 Bolt 19 Upper saddle 20 Lower saddle 21 Valve casing 22 Connection opening 23 Valve rod 24 Valve body 25 Flow hole 26 Flow hole 27 Flow hole 28 Remaining piece 29 Branch port 30 Sealing cap 31 Cutting Edge 32 Cutting Tool 33 Cover 34 Notch 35 Rake Surface 36 Flank Surface 37 Outer Surface 38 Outer Surface 39 Inner Surface 40 Coupling Hole 41 Coupling Hole 42 Linear Chip 43 Spiral Chip 44 Collar

Claims (7)

[Claims] 1. A cylindrical casing mounted in a perforation region of a fluid pipe and defining a closed working space for perforation, and axially reciprocally and rotatably screwed into the casing. In a drilling device consisting of a drive shaft and a hollow cylindrical drilling tool attached to the tip of the drive shaft,
The punching device, wherein the drive shaft is formed in a hollow shape, and a thrusting rod that can project beyond the tip of the drilling tool is slidably arranged in the hollow drive shaft. 2. The punching device according to claim 1, wherein a holding force is generated between the thrust rod and the hollow drive shaft so as to prevent the thrust rod from falling due to its own weight. 3. The punching device according to claim 2, wherein the holding force is given by a sealing means interposed between the thrust rod and the hollow drive shaft. 4. A drilling tool attached to the tip of a hollow drive shaft is a hollow cylindrical blade having a cutting edge at the tip, and a cylindrical cover surrounding the blade except near the cutting edge at the tip of the blade. And the cutting edge is formed by a notch provided in the hollow cylindrical blade, the notch reaching the inner peripheral surface from the outer peripheral surface of the hollow cylindrical blade, and the workpiece to be drilled. 4. The punching device according to claim 1, which has an axial depth larger than the wall thickness. 5. The peripheral wall of the notch forming the rake face of the cutting edge extends substantially linearly toward the bottom of the notch in the vicinity of the cutting edge, and gradually becomes circular as it approaches the bottom of the notch. The punching device according to claim 4, which is curved in an arc shape. 6. The punching device according to claim 4, wherein the rake face of the cutting edge forms a predetermined rake angle with respect to the generatrix of the hollow cylindrical blade. 7. The outer peripheral surface of the hollow cylindrical blade near the tip end portion is conically expanded until it reaches the outer peripheral surface of the cover, and the inner peripheral surface of the cover is also correspondingly expanded in conical shape. The punching device according to any one of claims 4 to 6.