JP4330725B2 - Cutter and branch joint - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
When branching a branch pipe from an existing synthetic resin main pipe, such as polyethylene, through which a fluid such as a gas flows, the branch take-out is performed by removing the branch pipe without leaking the fluid to the outside. The present invention relates to a joint and a cutter used therefor.
[0002]
[Prior art]
In general, as the branch is taken out joint for branching the branch pipe from the original tube made existing synthetic resin flowing gas or the like, disclosed in the real Unexamined 3 -12087 and JP 11-159683 Patent Laid For example Things are known. FIG. 12 shows an example of this. For example, a branch joint 4 is welded to the outer peripheral surface of a main tube 2 made of synthetic resin such as polyethylene. This joint 4 has a cylinder body 8 in which a hole saw 6 is housed. The hole saw 6 screwed into the female screw 10 of the cylinder body 8 is rotated from the upper part of the cylinder body 8 using an operating tool, so that the main pipe 2 The outer peripheral surface side portion is cut by a cylindrical hole saw 6 and perforated. A branch pipe 16 is connected to the joint 4 via a joint 14.
[0003]
[Problems to be solved by the invention]
By the way, in the conventional branch extraction joint 4, the hole saw 6 cuts and pierces the side of the main pipe 2 with the cylindrical cutting blade 12, so that a large flow rate branch extraction is performed on the main pipe 2. Then, the diameter of the horusoe 6 must be increased, and when the horuseau 6 becomes larger in diameter, the cylindrical body 8 becomes larger and the entire joint becomes a larger shape.
On the other hand, in this application, in Japanese Patent Application Laid-Open No. 11-159683, a cutter having a cross-sectionally-shaped or arcuate cutting edge is used, and this is erected on the outer peripheral surface side of the main tube. A compact branch extraction joint is disclosed that is pierced so as to cut out the side portion of the main tube by pressing from the direction.
[0004]
However, in the cutter of this joint, since the thickness of the main tube 2 is very thick, for example, about 20 mm, the cutter itself receives a large reaction force from the synthetic resin main tube 2 at the time of cutting. Since it is deformed or broken, there is a problem that the cut surface is deformed and a cut surface having an appropriate shape cannot be obtained.
The present invention has been devised to pay attention to the above problems and to effectively solve them. An object of the present invention is to provide a cutter and a branch extraction joint that can prevent breakage and deformation.
[0005]
[Means for Solving the Problems]
Cutter invention, the side portions of the synthetic resin of the original pipe, drilling cut by advancing so as to cross with respect to the original pipe at a position offset of the axis of the source tube as defined in claim 1 The cutter support plate, a cutter plate whose both ends are fixed to the cutter support plate and bent in a cross-sectional curved shape, and formed at one end of the cutter plate and positioned on the cutter support plate side A blade portion formed by an inner peripheral blade surface and an outer peripheral blade surface located on the opposite side of the cutter support plate, and the outer periphery of the blade portion as it goes from both ends of the blade portion toward the center side. The width of the blade surface is gradually increased , the width of the inner peripheral blade surface is gradually decreased , and the inner periphery of the outer peripheral blade surface and the inner peripheral blade surface at both ends of the blade portion. Only the blade surface is formed In the central portion of the blade portion is obtained as is set in the range of the width, such as width of the inner peripheral edge surface is from zero to equal to a width of the peripheral cutting edge surface. In this way, the shape of the blade surface of the blade part is characterized, so that it is possible not only to increase the strength and prevent this deformation and damage without increasing the thickness of the cutter plate itself, but also to reduce the distortion. It becomes possible to obtain a simple cut surface.
[0006]
In this case, as defined in claim 2, for example, the width of the inner peripheral blade surface may be zero at the center of the blade portion .
[0007]
Further, as prescribed in claim 3, in the cutter support plate, if such sections holding member for holding the sections generated when cut the original tube is provided, the Motokan The section does not hinder the flow of fluid such as gas.請Motomeko 4 the provisions to invention, in the branch taken out joint, a saddle unit which is connected to the surface of the synthetic resin of the original tube, the branch pipe that branches perpendicular to the axis of the source tube from the saddle Move along the longitudinal direction in the perforated pipe part to cut and perforate the connecting part, the perforated pipe part provided between the saddle part and the branch pipe connecting part, and the side part of the main pipe It is comprised with either of the said cutters provided possible.
[0008]
As a result, the branch pipe can be connected in a state where a fluid such as a gas flows through the main pipe, and the cutter itself can be prevented from being damaged or deformed, and an appropriate cut surface with less distortion can be obtained. In this case, as prescribed in claim 5, wherein the cutter, after perforating the original tube, is accommodated together with sections of the original tube to the drilling pipe section. Thereby, the section of the main tube does not obstruct the flow of fluid such as gas.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Below, one example of a cutter and a branch extraction joint concerning the present invention is explained in full detail based on an accompanying drawing.
FIG. 1 is a cross-sectional view showing a branch extraction joint incorporating the cutter of the present invention, FIG. 2 is a plan view of the branch extraction joint shown in FIG. 1, FIG. 3 is a perspective view showing the cutter, and FIG. 4 is a bottom view showing the cutter. FIG. 5 is a diagram showing the shape when the blade portion of the cutter is extended linearly and the cross-sectional shape of each portion. In the figure, the same parts as those shown in FIG.
[0010]
1 and 2, reference numeral 2 denotes a main pipe made of a synthetic resin such as polyethylene, and a fluid such as a gas flows therein. The main tube 2 has an inner diameter of, for example, about 200 mm and a thickness of about 18 mm. The branch extraction joint 20 of the present invention is connected to the main pipe 2 in the live pipe state (a state where gas or the like is flowed), and the branch pipe 16 is branched by the joint 14 through this. The branch extraction joint 20 is mainly configured by a joint body 22 made of, for example, polyethylene and a cutter 24 accommodated therein. The joint body 22 includes a saddle portion 26 having a substantially semicircular cross section that contacts the side surface of the main pipe 2 and a branch pipe connection portion 28 that branches substantially orthogonally to an axis 2A that passes along the center of the main pipe 2. And a perforated pipe portion 30 provided between the saddle portion 26 and the branch pipe connecting portion 28 and projecting upward to accommodate the cutter 24 therein. On the opposite side of the saddle portion 26 of the joint body 22 is provided a connecting tool 32 having a substantially arc-shaped cross section so as to sandwich the main tube 2, and both flange portions 26 </ b> A and 32 </ b> A are tightened with bolts 34. Thus, the joint 20 is firmly fixed to the main pipe 2.
[0011]
A heater 36 is wound around the inner peripheral surface of the saddle portion 26, and the outer peripheral surface of the main tube 2 and the inner peripheral surface of the saddle portion 26 are welded and fixed by the heat of the heater 36. The internal fluid is sealed.
The perforated tube portion 30 is formed as a cylindrical body having a substantially semi-elliptical cross section, and the cutter 24 is accommodated therein as described above. The perforated tube portion 30 is provided with a guide rod 38 penetrating along the vertical direction thereof. The upper end of the rod 38 is rotatably supported by a hexagon nut 42 and a rod flange portion 44. Yes. Further, a sealing member 46 such as an O-ring is interposed in the penetrating portion of the rod 38 to prevent leakage of gas or the like.
The upper and lower ends of the guide rod 38 are configured as hexagonal portions 48 and 50 having a hexagonal shape, for example, and the guide rod 38 can be rotated by a tool (not shown). Further, the hexagonal portions 48 and 50 are surrounded by hollow protrusions 52 and 54 so that the upper end or the lower end thereof is covered. Screw threads 52A and 54A are cut on the outer peripheries of the protrusions 52 and 54, respectively, and caps 56 and 58 are screwed to improve the sealing performance.
[0012]
On the other hand, a screw thread 38A is cut in the upper half of the guide rod 38, and a flange portion 60A of the ceiling plate 60 of the cutter 24 is screwed to the screw thread 38A. By rotating, the cutter 24 itself can be moved in the vertical direction.
As shown in FIGS. 3 to 5, the cutter 24 has a planar cutter support plate 62 and both ends fixed to the cutter support plate 62 and bent in a curved shape having a substantially semi-elliptical cross section. The cutter plate 64 and a blade portion 66 formed at the lower end of the cutter plate 64 are mainly configured. The above-described ceiling plate 60 is joined to the upper end of the cutter 24. The cutter support plate 60 has a thickness W1 of about 6 mm, and the cutter plate 64 has a thickness W2 of about 2 mm. The material of the cutter plate 64 is, for example, SK5 tool steel according to JIS standards. Composed.
[0013]
Here, the characteristic point in the cutter 24 of the present invention is that the cross-sectional shape of the cutter plate 64 is not simply a double-edged blade or a simple single-edged blade, but the cross-sectional shape changes depending on the location. . Specifically, the taper surface outside the blade portion 66, that is, the outer peripheral blade surface 66A of the blade edge gradually becomes larger or wider as it goes from the both ends X1, Y1 of the blade portion 66 to the center portion P1, and conversely The inner tapered surface, that is, the inner peripheral blade surface 66B of the cutting edge is gradually made smaller or narrower. This state is shown in FIG. 5, while the inner peripheral blade surface 66B is formed 100% at the points X1 and Y1 which are both ends of the blade portion 66, whereas the outer peripheral blade surface 66A is zero. , 100% inner blade. Then, the outer peripheral blade surface 66A gradually increases toward the point P1, which is the central portion, and conversely, the inner peripheral blade surface 66B decreases gradually, and at points X2 and Y2 that are positions of length 1/2. The widths of the outer peripheral blade surface 66A and the inner peripheral blade surface 66B are substantially equal to each other, so that the two blades are uniform. And at the point P1 which is the center part of the blade part 66, on the contrary, the outer peripheral blade surface 66A is formed 100%, whereas the inner peripheral blade surface 66B is zero, which is 100% outer blade. Yes.
[0014]
As described above, the reason why the inner peripheral blade surface 66B is enlarged at both ends of the blade portion 66 is that a large reaction force is generated inward during the cutting operation particularly in this portion. This is to generate a counter force toward the outside. As described above, by forming the cutting edge into an irregular shape, it is possible to prevent the cutter plate 14 from being deformed or damaged during cutting as described later. In this case, the angle θ of the blade edge is set within a range of 10 to 30 °, preferably within a range of 15 to 25 °.
Moreover, although the blade edge shape of the point P1 which is the center part of the blade part 66 is 100% outer blades here, the shape is not limited to this, and for example, as shown in FIG. Further, as shown in FIG. 1, an inner surface of the lower portion of the cutter support plate 62 is provided with a section member 68 that can be bent and deformed, which is made of a resilient member such as spring steel. A section generated by cutting the main tube 2 is held by the section holding member 68 and can be accommodated in the cutter 24.
[0015]
Next, the operation of the present embodiment configured as described above will be described.
First, as shown in FIG. 1, the main pipe 2 in the live pipe state is sandwiched between the joint body 22 of the branch outlet joint 20 and the connection tool 32, and both are firmly attached and fixed by bolts 34, and the saddle portion 26 The heater 36 is energized to weld and fix the surface of the main tube 2 and the inner peripheral surface of the saddle portion 26. At the same time, the branch pipe 16 is also connected and fixed to the branch pipe connecting portion 28 via the joint 14 while ensuring sealing performance.
Next, by attaching a tool (not shown) to the hexagonal portion 42 at the upper end of the guide rod 36 and rotating the rod 36, the cutter 24 itself accommodated in the perforated tube portion 30 is gradually lowered to lower the main tube. Start cutting 2.
When the cutter 24 is lowered, first, the central portion P1 of the blade portion 66 comes into contact with the main tube 2 and cuts it. Further, when the cutter 24 is lowered, the cut is made from the central portion P1 of the blade portion 66 to both ends thereof. As shown in FIG. 7, a part of the side surface of the main tube 2 is finally cut off, and the generated section 2B is housed in the cutter 24 and is held by the section. The state is held by the member 68. In this way, the side surface of the main tube 2 is cut off at a position offset from the axis 2A.
[0016]
As described above, when the cut and drilling is completed, the guide rod 36 is reversed to raise the cutter 24 and accommodate it again in the drilling tube portion 30 as shown in FIG. At this time, the slice 2B is accommodated in the cutter 24, and a large hole 70 is formed in the main tube 2. Then, the caps 56 and 58 are screwed into the upper and lower protrusions 52 and 54, respectively, and the portions are sealed, thereby completing the operation.
Here, when cutting the main tube 2 with the cutter 24, if the cutting edge of the blade portion 66 is evenly double-edged, a large reaction force is applied to the inside at both end portions of the blade portion 66. In the vicinity of both end portions of the portion 66, for example, an external drag force directed outward is generated by increasing the area of the inner peripheral blade surface 66B at points X1 and Y1 in FIGS. 5 and 6, and the blade portion In the center portion of 66, for example, in the vicinity of the point P1, the internal drag force is generated to the inner side of the blade portion 66, so that the external drag force is further promoted by this internal drag force. In addition, it is possible to prevent the cutter plate 64 from being deformed or damaged.
[0017]
That is, at first, when the cutter 24 starts to bite into the main tube 2, an inward compression force acts in the vicinity of the central portion P1, and when the cutting advances and both end portions X1 and Y1 side of the blade portion 66 begin to cut, The force that pushes outward gradually acts, the previous compression force is relaxed, and the force pushing outward becomes stronger, and the cutter plate 64 does not deform or break as a whole.
In this way, the main tube 2 can be cut without causing deformation or breakage of the cutter plate 64, so that an appropriate substantially circular cut surface (hole shape) with little distortion can be obtained.
For comparison, the main tube was cut out using a comparative example in which only the shape of the cutting edge was different from that of the present embodiment, and the result will be described with reference to FIG.
[0018]
FIG. 9 (A) shows a cutter of a comparative example in which the blade part 66 has a uniform double blade over the entire length, and the angle of both blade surfaces is set to 7.5 °. FIG. 9 (B) shows a comparative example of the cutter having irregular blades over the entire length of the blade portion 66. The angle of the outer peripheral blade surface is set to 5 °, and the angle of the inner peripheral blade surface is set to 10 °. ing. FIG. 9C shows the cutter of the present invention, and the angle of the blade edge is set to 15 °.
As shown in the figure, in the case of the uniform double blade shown in FIG. 9A, a large reaction force is applied inward at both ends of the cutter plate 64, and this part is greatly bent and deformed inward. In addition, cracks occurred at the cutting edge. In this case, the shape of the hole 70 formed in the main tube 2 is small and greatly distorted, which is not preferable.
[0019]
In the case of the irregular double-edged blade shown in FIG. 9 (B), the cutter plate 64 itself was hardly deformed, but a large crack occurred at a location indicated by x in the drawing, and the hole 70 formed in the main tube 2 was formed. The shape was relatively less distorted, but was not preferred because it had a small diameter and was below the standard.
On the other hand, in the case of the present invention shown in FIG. 9C, the cutter plate 64 itself is not deformed or damaged, and the shape of the hole 70 formed in the main tube 2 is not distorted. However, it was possible to form a hole according to the standard. Moreover, when it performed about the cutter of this invention which changed the angle of the blade edge | tip into 25 degrees, the same result was able to be obtained.
[0020]
Here, the case where the cutter 24 remains in the branch take-out joint 20 and the cutter 24 is not reused has been described as an example. However, the present invention is not limited to this and can be reused as shown in FIGS. 10 and 11. A branch extraction joint 72 having a simple structure may be used. That is, here, the guide rod 36 of the previous embodiment, the flange portion 60A of the cutter 24 and the ceiling portion of the perforated pipe portion 30 are eliminated (see FIG. 1), and instead the inner peripheral wall of the perforated pipe portion 30 is This is referred to as a guide surface 30A.
And the upper part of the perforated pipe part 30 is enlarged and formed into the plug mounting part 80. A shutter device 84 is mounted on the flange portion 82 of the plug mounting portion 80, and a drilling hydraulic tool 86 for pressing the cutter 24 is mounted on the shutter device 84.
[0021]
Then, the cutter 88 is pressed toward the main tube 2 by using the spindle 88 of the drilling hydraulic tool 86, and the side portion of the main tube 2 is punched, and then the cutter 24 is pulled up to be used for the shutter plate 84A of the shutter device 84. Returning upward, the shutter plate 51 is closed. Then, a plug 90 (see FIG. 11) is attached to the tip of the spindle 88 instead of the cutter 24, and after opening the shutter plate 84A again, the plug 90 is pushed into the plug device portion 80 to close it. In this state, the shutter device 84 and the drilling hydraulic tool 86 are removed, and the sealing plate 92 is attached and fixed to the flange portion 82 to completely seal the inside of the drilling tube portion 30.
According to this, the cutter 24 can be reused. In addition, the cutter 24 itself is not deformed or damaged as described above.
In addition, the numerical value in the said Example is only an example, and is not limited to this.
[0022]
【The invention's effect】
As described above, according to the cutter and the branch extraction joint of the present invention, the following excellent operational effects can be exhibited.
According to the invention prescribed in claims 1-2. Thus to have a feature in the shape of the blade surface of the blade portion, without increasing the cutting board itself, the deformation or breakage by increasing the intensity Not only can this be prevented, but an appropriate cut surface with less distortion can be obtained.
According to the invention as defined in請Motomeko 3, nor sections Motokan inhibits the flow of fluid such as gas.
According to the invention prescribed in claims 4, under a stream of fluid such as gas based pipe, it can be connected to branch pipes, moreover, damage or deformation of the cutter itself can be prevented, less appropriate cutting surface distortion Can be obtained.
According to the invention as defined in請Motomeko 5, nor sections Motokan inhibits the flow of fluid such as gas.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a branch joint having a built-in cutter according to the present invention.
FIG. 2 is a plan view of the branch take-out joint shown in FIG.
FIG. 3 is a perspective view showing a cutter.
FIG. 4 is a bottom view showing the cutter.
FIG. 5 is a diagram showing a shape when the blade portion of the cutter is extended linearly and a cross-sectional shape of each portion.
FIG. 6 is a view showing a modification of the shape of the blade edge of the blade portion.
FIG. 7 is a view showing the operation of the branch outlet joint of the present invention.
FIG. 8 is a view showing the operation of the branch take-out joint of the present invention.
FIG. 9 is a diagram showing the operation results of the joint of the present invention and the conventional joint.
FIG. 10 is a view showing a modification of the branch take-out joint of the present invention.
FIG. 11 is a view showing a modification of the branch take-out joint of the present invention.
FIG. 12 is a view showing a conventional branch extraction joint.
[Explanation of symbols]
2 Main pipe 2B Section 16 Branch pipe 20 Branch extraction joint 22 Joint body 24 Cutter 26 Saddle part 28 Branch pipe connection part 30 Perforated pipe part 38 Guide rod 62 Cutter support plate 64 Cutter plate 66 Blade part 66A Outer peripheral blade surface 66B Inner peripheral blade Surface 68 Section holding member

Claims (5)

The sides of the synthetic resin of the original pipe, the cutter for drilling cut by advancing the so that you orthogonal with respect to the original pipe at a position offset of the axis of the source tube,
A cutter support plate, a cutter plate which is bent in cross-section curved at both ends with respect to the cutter support plate is fixed, Rutotomoni is formed at one end of the cutter plate, Uchishu positioned in the cutter support plate side A blade portion formed by a blade surface and an outer peripheral blade surface located on the opposite side of the cutter support plate ;
The width of the outer peripheral blade surface of the blade portion is gradually increased from both ends of the blade portion toward the center portion side, and the width of the inner peripheral blade surface is gradually decreased , and the blade portion Only the inner peripheral blade surface of the outer peripheral blade surface and the inner peripheral blade surface is formed at both ends of the inner peripheral blade surface, and the width of the inner peripheral blade surface is from zero to the outer peripheral blade surface at the central portion of the blade portion. Cutter characterized by being set to a width range that is the same as the width . 2. The cutter according to claim 1, wherein a width of the inner peripheral blade surface is zero at a central portion of the blade portion. The cutter according to claim 1 or 2, wherein the cutter support plate is provided with a section holding member for holding a section generated when the main tube is cut off. A saddle part connected to the surface of the synthetic resin main pipe, a branch pipe connecting part that branches perpendicularly to the axis of the main pipe from the saddle part, and between the saddle part and the branch pipe connecting part a perforated pipe portion that is provided, for drilling cut the sides of the original tube, in any one of said perforations tube according to claim its longitudinal direction is movable along the portion 1乃Itaru 3 Branch take-off joint composed of the described cutter. The cutter, after perforating the original pipe, the branch taken out joint請Motomeko 4, wherein a housed together with sections of the original tube to the drilling pipe section.

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