JPS6219634B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pipe cutting machine that cuts and removes the middle of an existing pipe in order to install a valve in the middle of the existing pipe.

[Prior art]

Generally, a cutting machine that cuts and removes the middle of an existing pipe has a cylindrical frame that is installed and positioned concentrically with the pipe, and a machine that rotates the outer circumference of the pipe on both sides of the cylindrical frame in the direction of the pipe axis. It consists of a large gear that is attached to a large gear, and a tube cutting tool that is attached to the large gear. As shown in , it was configured to rotate along a plane perpendicular to the axis of the tube.

[Problem that the invention seeks to solve]

It was not easy to remove the cut tube because the tube returned after being cut.

Therefore, it is possible to use a cutting tool with a thick cutting edge to widen the width of the cutting line and shorten the length of the pipe to be cut and removed in the axial direction, making it easier to remove the cut pipe. There is a limit to shortening the length of the tube to be cut and removed by increasing the thickness of the tube, and when the tube returns to a large extent, there is also the disadvantage that it is not easy to remove the cut tube.

The present invention attempts to solve the above-mentioned drawbacks by devising a method for cutting the tube.

[Means for solving problems]

The characteristic structure of the present invention for achieving the above object is as follows:
A cylindrical frame is installed in the middle of the existing pipe and is positioned concentrically with the pipe, and large gears are installed on both sides of the cylindrical frame in the direction of the pipe axis to rotate around the outer circumference of the pipe. In a pipe cutting machine configured to cut and remove a part of the existing pipe by installing a cutting machine consisting of a cutting tool attached to the large gear,
The present invention is characterized in that the cutting tools attached to the large gears on both sides of the cylindrical frame are configured to rotate along planes that are inclined in directions opposite to each other with respect to a plane perpendicular to the axis of the tube.

[Effect]

The pipe to be cut and removed is cut into a trapezoidal shape using a cutting tool attached to a large gear that rotates around the outer circumference of the pipe, and when the pipe returns after cutting, the pipe to be cut and removed is cut on both the left and right sides. The action of the tapered surface of the tube causes it to be pushed out in the radial direction of the tube.

〔Effect of the invention〕

In this way, the cut tube is subjected to an acting force that pushes it out in the radial direction of the tube, making it easier to withdraw the tube.

Furthermore, when cutting a pipe into a tapered shape, the larger the return of the pipe after cutting, the stronger the acting force that pushes it outward in the radial direction. Evacuation becomes easier.

〔Example〕

A housing A is constituted by a lower case 1, an intermediate case 2, a water control valve 3, an upper case 4, and an upper cover 5, and a driver 6 is mounted on the upper cover 5. A pipe 7 is inserted into the lower and intermediate cases 1 and 2, and a gland insert 10 and a split ring setter 11 are inserted into the semi-cylindrical flange parts 8, 8, 9, 9 that protrude along the pipe 7. 7 and is attached. On the other hand, as shown in FIG.
is fitted, and the split joint ring setter 1 is attached by the rod member 14.
1. The cylindrical frame 15 is positioned and attached concentrically with the tube 17, and includes a cylindrical frame 15a in the lower half and a cylindrical frame 1 in the upper half.
5b is a cutting machine divided in the radial direction (see FIG. 3), and after being fitted into the tube 7 individually, it is constructed as one piece. The guide flange 16 attached to both sides of the guide groove 17 provided on the inner surface of the housing A
The cutting machine 15 is positioned laterally with respect to the axis of the tube 7 by fitting into the cutter 15, and the circumferentially tapered protruding member 18 provided at the bottom is fitted into the fitting hole 19a of the bottom base 19 of the lower case 1. By combining,
Level positioning of the cutting machine 15 with respect to the axis is performed. Further, the cutting machine 15 is equipped with a cutting mechanism B for cutting the pipe 7. The cutting mechanism B is connected to the driver 6 via a drive shaft 21 inserted into the intermediate shaft 20 shown in FIG. The power of the driver 6 is transmitted from gears 22 and 23 to a small gear 24, and then via a chain 25 to a large gear 26 that rotates around the outer circumference of the tube 7.
The large gear 26 includes a cutting tool feeding mechanism 27 and a cutting tool 2.
8 is attached, and each time the large gear 26 rotates once, the cam member 29 of the cutting tool feed mechanism 27 engages with the pin member 30 fixed to the main body of the cutting machine 15 and rotates, thereby delivering one pitch to the cutting tool 28. feed amount. The distance L between the cutting tools at both ends at the upper end position of the cutting tool 28 is set to be larger than the distance L between the cutting tools at the lower end position. In other words, the tools 28, 28 attached to the large gears 26, 26 on both sides of the cylindrical frames 15a, 15b are rotated along surfaces that are inclined in opposite directions with respect to a surface perpendicular to the axis of the tube 7. It is configured. This is to perform an oblique cut on the pipe 7, take into consideration the possibility that the pipe 7 may turn back after cutting, and facilitate the removal of the cutting machine 15 and the cut pipe. 31 connects the cutting machine 15 to the pipe 7
The head 31a of the screw member is crimped and fixed by a pressing device 32 attached to the lower and intermediate cases 1 and 2. 33 is a viewing window for checking the situation inside the housing A.

The configuration of the intermediate shaft 20 that connects the driver 6 and the cutting machine 15 is as follows.

As shown in FIG. 6, a drive shaft 21 connected to the driver 6 is inserted into the intermediate shaft 20. As shown in FIG. This drive shaft 21 is the cutting machine 1
The shaft 15a connected to the cutting machine 5 and the universal joint 34 are configured to transmit the power of the driver 6 to the cutting machine 15. however,
If the connection between the driver 6 and the cutting machine 15 is made up of just the universal joint 34, there is a risk that the drive shaft 21 will oscillate and the universal joint 34 will not be fully engaged, making it difficult to maintain stability. Power transmission is difficult. Therefore, on the lower end side of the intermediate outer cylinder 35, cylindrical bodies 36, 37, 38 and a sleeve 39 having threaded portions are provided.
Due to this, the sliding bearing part 40 of the drive shaft 21
Configure. Further, the cylindrical body 38 is provided with an annular flange portion 41 that projects outward. 42 is a cylindrical member having an annular flange portion 43 protruding inward at the upper end and a threaded portion 44 at the lower end. The annular flange portion 43 engages with the annular flange portion 41 of the cylindrical body 38 which is screwed and fixed to the intermediate outer cylinder 35, and the threaded portion 44 engages with the outer cylinder 45 of the cutting machine 15. Reference numeral 46 denotes an inner cylinder that is interposed inside the cylindrical member 42 and is threadedly engaged with the inner circumferential surface of the cylindrical body 38 . Reference numeral 47 denotes a handle for rotating the cylindrical member 42, whereby the threaded portion 44 at the lower end of the cylindrical member 42 is cut while the annular flange portion 43 thereof is engaged with the annular flange portion 41 of the cylindrical body 38. It is screwed onto the outer cylinder 45 of the machine 15. At this point, the dimensions of the inner cylinder 46 are determined in advance as required, and the drive shaft is assembled by screwing and tightening the cylinder member 42 until the lower end of the inner cylinder 46 contacts the outer cylinder 45 of the cutting machine 15. 21 and the universal joint 34 of the shaft 15a can be properly fitted. Further, as shown in FIG. 3, the cutting machine 15 is fixed to the housing A by a guide collar 16, a circumferentially tapered projecting member 18, a screw member 31, and a pressing device 32, and the intermediate outer cylinder 35 is attached to the upper part. Since the upper end portion is fixed on the cover 5, the universal joint 34 does not oscillate laterally due to the screwing of each cylinder, and stable operation is possible.

Next, installation of the fluid control valve will be explained.

First, a fluid control valve installation device is configured as shown in FIG. 1, and the driver 6 is driven to start cutting the pipe 7. The water control valve 3 is in an open state. As the cutting of the pipe 7 progresses, the inside of the casing A becomes filled with water, and the pipe 7 becomes particularly in the lower and middle cases 1, 1,
Flow of water takes place through 2. When the cutting of the tube 7 is completed, the driver 6 is removed from the intermediate shaft 20, and the cutter 15 and the cut tube are moved together into the upper case 4 along the guide mechanism 17 provided on the inner surface of the housing A. Pull up to. This lifting involves the engagement of the annular flange portion 38 at the lower end of the intermediate outer cylinder 35 and the annular flange portion 43 of the cylindrical member 42,
This is done by threading the outer cylinder 45 of the cutting machine 15 and pulling up the intermediate part 20. After that, close the water control valve 3, drain the water in the upper case 4,
Remove the upper case 4 from the water control valve 3. Then, the cutting machine 15 is removed from the intermediate shaft 20, and a fluid control valve 48 (see FIG. 4) is installed in its place. Similar to the cutting machine 15, the water control valve 48 is equipped with a guide collar 16 and a circumferentially tapered projecting member 18. The upper case 4 is installed on the water control valve 3 together with the fluid control valve 48, and the water control valve 3 is opened again. Next, fluid control valve 4
8 is lowered through the intermediate shaft 20 along the guide structure 17 on the inner surface of the casing A, and placed in the cut space of the tube 7. And the rod member 14 of the split joint ring setter 11
is advanced to push back the split ring 13, and its tip is fitted into the flange portion 48a of the fluid control valve 48. Thereby, the fluid control valve 48 and the pipe 7 are temporarily fixed by the O-rings 12, 12 of the split joint ring 13. If the temporary fixing is good, the water inside the case A is drained, and the worker enters the case A through the opening/closing window (not shown) provided on one side of the upper case 4.
The connection between the intermediate shaft 20 and the fluid control valve 48 is released. This operation is performed by turning the handle 47 shown in FIG.
It's better to remove it. After that, remove each device in the following order: upper cover 5, upper case 4, water control valve 3, split joint ring setter 11, gland presser 10, intermediate case 2, and lower case 1. Then, the guide collar 16 and the circumferentially tapered projecting member 18 attached to the fluid control valve 48 are removed, and the split ring 13 is completely tightened and fixed. Finally, protective concrete 50 for reinforcing the connection points is constructed as shown in FIG.
The opening/closing mechanism 51 may be installed.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of the fluid control valve installation device, Figure 2
The figure is a vertical side view showing the relationship between the cutting machine, the lower and intermediate cases, and the pipe, and Figure 3 is its vertical front view.
FIG. 4 is a longitudinal sectional side view when the fluid control valve is placed at the cut point, FIG. 5 is a schematic diagram showing the completed installation of the fluid control valve, and FIG. 6 is a longitudinal sectional view of the intermediate shaft. 7...Pipe, 15...Cutting machine, 15a, 15b...
...Tubular frame, 26...Large gear, 28...Bite.

Claims (1)

[Claims] 1 Cylindrical frames 15a and 15b installed in the middle of the existing pipe 7 and positioned concentrically with the pipe
Large gears 26, 26 are attached to both sides of the cylindrical frames 15a, 15b in the tube axis direction to rotate around the outer periphery of the tube 7, and a cutting tool 28 is attached to the large gears 26, 26. A cutting machine 15 consisting of 28
In a pipe cutting machine configured to cut and remove the middle of the existing pipe 7, the cutting tools 28, 28 attached to the large gears 26, 26 on both sides of the cylindrical frames 15a, 15b are connected to the center line of the pipe. A tube cutting machine, characterized in that it is configured to rotate along planes that are inclined in directions opposite to each other with respect to a plane perpendicular to the plane.