JP3504787B2 - Pipe cutting device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe cutting apparatus used for cutting a fixed pipe when cutting a fixed pipe.
More specifically, by performing cutting by moving the rotary tool in the direction of the rotation axis and turning the pipe in the circumferential direction, the pipe can be formed with a simple structure while improving the processing efficiency. The present invention relates to a body cutting device . 2. Description of the Related Art In recent years, a large amount of water has been required as the population has increased, and the diameters of pipes used as water supply pipes and water distribution pipes for supplying these waters have been increasing proportionally. [0003] On the other hand, most of these pipes are buried underground, but they are often changed due to city planning and the like. For example, new branch pipes are taken out of conventional pipes, and natural disasters such as earthquakes occur. When cracks are caused by this and corrosion occurs due to use for many years, the part is cut at a predetermined interval, and another pipe is connected to the part. [0004] In addition to the above-mentioned buried pipes, pipes used in chemical plants, hydroelectric or nuclear power plants, etc. are installed on the ground. [0005] These pipes have various pipe forms such as horizontal, vertical and oblique, and fixed pipes of such various forms are cut at predetermined intervals from the middle thereof. [0006] Such a work of cutting the fixed pipe is mainly performed on site, and is usually performed in a state of uninterrupted water in which a fluid (for example, water) remains in the pipe. In order to prevent leakage of water, the periphery of the cutting portion and the cutting device is previously covered with a casing (housing) in a water-sealed state. Further, a cutting device used for such a cutting operation of a pipe has conventionally used a plurality of unillustrated tools (such as cutting tools) which are pivoted in the circumferential direction of the pipe on the outer periphery of the pipe of the fixed pipe. The cutting process is performed by applying a cutting feed toward the center of the tube. [0008] In the on-site cutting operation of the tubular body with such a tool (such as a cutting tool), the circumferential cutting feed speed for one axial cutting feed is supported. Due to the rigidity of the equipment, it cannot be increased so much that the machining efficiency decreases, and a large cutting force is applied, so the equipment supporting the cutting tool becomes complicated and large, resulting in high cost. There is a drawback that the structure is complicated because the feeding in the center direction is automatically performed. According to the present invention, the outer periphery of a predetermined portion of a fixed tubular body
The pipe is installed so that it can pivot, and a predetermined portion of the pipe is
Around and used for pipe cutting work of uninterrupted water,
Pipe cutting for easy removal of the cut pipe after cutting
It is intended to provide a cutting device. According to the present invention, a tube cutting device is installed on an outer periphery of a predetermined portion of a fixed tube, and a tube and the tube cutting device are provided. A pipe cutting device that is surrounded by a housing and used for pipe cutting operation of uninterrupted water, wherein the pipe cutting device includes:
A rotating tool driven to rotate, an axial cutting moving means fixed to a frame for moving the rotating tool in an axial direction toward the center of the tube, and the axial direction moving along an outer periphery of a predetermined portion of the fixed tube.
Turning cutting moving means provided to be capable of turning movement together with the direction cutting moving means, for cutting and moving the rotary tool in the circumferential direction of the pipe, and after the pipe cutting, the rotary tool is moved from the cutting section to the pipe cutting apparatus side. Evacuation means for moving away from each other
And wherein the Tei Rukoto. With this feature, when removing the cut pipe after the cutting process, the rotating tool is separated from the cut portion of the cut pipe to the pipe cutting device side, so that the work of removing the cut pipe and the pipe cutting device is easy. become. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments and the drawings. First, the tube cutting device of the present invention will be described. FIG. 1 is a general view showing a first embodiment of the present invention, in which a tube cutting device is attached to a tube.
FIG. 5 is a sectional view of the tube cutting device. 1 and 5, reference numeral 1 denotes a tube cutting device, 2a and 2b denote fixed tubes, and 3 denotes a cutting tube. The tube cutting device 1 includes a rotary tool 4 mainly driven to rotate, an axial cutting and moving means 6 fixed to a frame 5 for moving the rotary tool 4 in the axial direction, and a rotary tool 4 The turning cutting moving means 7 for cutting and moving in the circumferential direction, and the fixed tool 2 from the cutting portion C of the cutting pipe 3 after cutting the rotary tool 4 into the pipe.
a, a retreating means 8 for moving away from the side 2a. More specifically, as shown in FIG. 5, for example, an end mill is mainly used as the rotary tool 4, and the end mill 4 is mounted on a housing 9 and is driven to rotate by the power of a drive source 10. Although an electric motor is used as the drive source 10, an actuator operated by a hydraulic or pneumatic source may be used depending on the use environment. Next, the axial cutting and moving means 6 comprises a hydraulic cylinder 11 fixed to the bottom of the frame 5, a piston 12 slidably inserted in the hydraulic cylinder 11, and one end of the piston 12. And a holder 14 fixed to the lower end of the hollow rod 13 and holding the rotary tool 4 at the tip. The turning cutting moving means 7 shown in FIG.
A pair of guide chains 20a, 20b wound around the fixed-side tube 2a or 2b, and the guide chains 20a, 20b;
b, and a drive unit 21 guided and moved on guide chains 20a, 20b via sprockets 24a, 24b, which will be described later, and driven on both sides (in the circumferential direction of the pipe) of the drive unit 21 A pulling chain 25 for pulling the unit 21 around the outer circumference of the tube 2a or 2b, a pair of wheels 26a and 26b for rollingly supporting the driving unit 21 on the outer circumference of the fixed pipe 2a or 2b, and a driving unit A drive source 22 (electric motor or hydraulic motor) for moving 21 on the outer periphery of the fixed tube 2a or 2b. More specifically, sprockets 24a, 24b
Are fixed to both ends of a rotation shaft 27 rotatably supported on the bottom of the drive unit 21 on both outer sides of the drive unit 21. Further, a pair of wheels 26 a and 26 b are rotatably supported on the drive shaft 27 inside the drive unit 21 so as to be rotatable with respect to the drive shaft 27. Although not shown, the drive unit 21
In the turning movement direction, another drive shaft is rotatably supported,
This drive shaft is provided with a pair of sprockets and wheels having the same configuration. The drive unit 21 basically holds one rotating tool per unit, but is not limited to one and may be configured to hold two or more rotating tools. A plurality of drive units 21 can be evenly arranged on the outer periphery of the fixed-side tube according to the diameter of the tube to be cut. It is also possible to provide a rotating tool and cut both sides of the drive unit 21 at the same time. Further, as shown in FIG.
An upper end is formed with a composite bearing 15 in which a thrust and a radial bearing are integrated with the frame 5, and a spline 16 is rotatably supported through the composite bearing 15, penetrates through the hollow rod 13 and engages with the holder 14 below. And a drive source 19 that transmits a turning drive force to the turning shaft 17 via a pair of bevel gears 18. The tube cutting apparatus of the present invention thus configured operates as follows. First, the tip of the rotary tool 4 is set at a position close to the first processing position on the outer periphery of the pipe P. Then, the rotary tool 4 is rotationally driven by the drive source 10, and at the same time, the axial moving means 6 is operated to gradually move the rotary tool 4 by the axial cutting feed. When the tip of the rotary tool 4 comes into contact with the outer periphery of the pipe to start drilling, the rotary cutting and moving means 7 is operated while the rotary tool 4 is rotated, and the drive unit 21 is gradually moved along the outer circumference of the pipe. Then, a groove is formed on the outer periphery of the pipe body P by turning and moving. More specifically, as shown in FIG. 1, when the drive source 22 is activated, a pair of drive shafts 27 are driven to rotate via a sprocket 23, whereby the four sprockets 24a, 24b. You. When the sprockets 24a, 24b are driven to rotate, the sprockets 24a, 20b are guided by the engaged chains 20a, 20b to start turning around the outer periphery of the tube P. The drive unit 21 has four wheels 26a, 26 which roll on the outer periphery of the tube P when turning.
It moves while being supported by b. During this movement, the drive unit 21 is held in a stable state by the towing chains 25 that are towed on both sides. When a plurality of drive units 21 are arranged on the outer periphery of the pipe in accordance with the number of rotary tools 4, the plurality of drive units 21 are provided.
To be connected to each other and towed. As described above, the plurality of rotary tools 4 are connected to the pipe P
By uniformly disposing the rotary tool 4 on the outer periphery of the pipe, the cutting of the pipe is performed by the axial cutting movement toward the center of the pipe P and the cutting movement in the pipe circumferential direction.
Since cutting can be performed with a small cutting force,
Processing efficiency can be improved. Next, a description will be given of a case where the pipe P is cut with uncut water as shown in FIG. 6. The cut pipe 3 is taken out to the outside. When the cutting tube 3 is pulled upward as it is,
The rotary tool 4, the housing 9, the drive source 10, the holder 14, and the like of the tube cutting device 1 located below interfere with the fixed tube P. Then, the rotary tool 4 is turned around the turning shaft 17 shown in FIG.
Alternatively, the cutting tube 3 can be taken out together with the tube cutting device 1 by moving away from the 2b side to the cutting tube 3 side, that is, the tube cutting device 1 side. The evacuation means 8 is effective when the pipe cutting device 1 and the cutting pipe 3 are both lifted from the casing B after the cutting of the water pipe. Next, a method of cutting the tube will be described with reference to FIGS.
This will be described below. FIG. 2 is an explanatory view of a first tube cutting method,
FIG. 3 is an explanatory view of the second tube cutting method, and FIG.
It is explanatory drawing of the pipe cutting method of FIG. First, in the first tube cutting method, as shown in FIG. 2, three rotating tools 4 a, 4
b, 4c are evenly arranged. FIG. 2 shows three rotating tools 4a, 4b and 4c.
Is performed simultaneously with the axial cutting movement toward the center of the tubular body P and the cutting movement in the circumferential direction of the tubular body to cut the tubular body. More specifically, the rotary tools 4a and 4b will be described. When the turning cutting movement is started from the start positions S1 and S2 where the tips of the rotary tools 4a and 4b simultaneously contact the outer periphery of the pipe P, for example, 4
a can cut the pipe P partially at E1 and the rotary tool 4b at E2. However, in the movement so far, the tubular body P is not completely cut in the rotary tool 4b because the remaining thick portion still exists between E2 and E1. Therefore, the machining end E1 of the rotary tools 4a and 4b
The remaining thick portion (hatched portion) between E2 and E2 is the rotary tool 4b
Can be completely cut by further turning and moving from E2 to E1. The turning range of the rotary tool varies depending on the cutting feed amount in the axial direction and the wall thickness of the tube. This consists of three rotating tools 4a, 4b, 4c
And the same is performed at the same time, so that cutting can be performed with a small cutting force.
Processing efficiency can be shortened. Next, in the second pipe cutting method, as shown in FIG. 3, three rotating tools 4 a, 4
b, 4c are evenly arranged. FIG. 3 shows three rotating tools 4a, 4b and 4c.
Is formed by piercing the pipe by axial cutting movement toward the center of the pipe P, and then cutting the pipe P by cutting and moving the rotary tools 4a, 4b, 4c in the pipe circumferential direction. It is. That is, the three rotary tools 4a, 4b, 4
“c” are arranged in the same phase in the turning movement direction, and each of the rotating tools cuts the pipe body P with the shortest moving distance by a 1/3 rotation turning cutting movement to the position of the next arranged rotating tool. be able to. Thus, the cutting movement in the circumferential direction of the tube can be performed at the shortest distance, so that the processing efficiency can be further improved. Next, in the third tube cutting method, as shown in FIG. 4, three rotating tools 4 a, 4
b, 4c are evenly arranged. FIG. 4 shows three rotating tools 4a, 4b and 4c.
After cutting a groove of a predetermined circumferential length by the axial cutting movement toward the center of the pipe P and the turning cutting movement in the circumferential direction of the pipe, and then cutting the pipe by the reverse turning cutting movement. It is. More specifically, the rotary tools 4a and 4b will be described. The rotary tools 4a and 4b simultaneously start rotating cutting movement from the start positions S1 and S3 where they come into contact with the outer periphery of the pipe P, and the grooves reach the positions E1 and E3. Processing is performed. Thereafter, the rotary tools 4a and 4b are moved back and forth from the positions E1 and E3 to return to the original start positions E2 and E4, thereby cutting the pipe. In order to ensure the cutting process, it is more preferable that the rotary tool is moved in the axial direction at the turn-back positions E1 and E3 of the rotary tool to make a through-hole and then a reverse turning operation is performed. Thus, the cutting movement range of the rotary tool in the circumferential direction of the tube can be performed with a small cutting movement range, and the cutting can be performed with a smaller cutting force.
Processing efficiency can be further improved. In the above-described embodiment of the tube cutting device of the present invention, cutting of only one side of the tube has been described. However, unnecessary tubes are cut at predetermined intervals.
In order to take out with the drive unit, two cutting parts C
It is, of course, preferable to cut at the same time. Although the embodiments of the present invention have been described with reference to the drawings, the specific structure is not limited to these embodiments. For example, an example in which a hydraulic cylinder is used for the axial cutting and moving means has been described. However, this may be a combination of a hydraulic or electric motor and a ball screw / nut, or manual feed. The invention is not limited to this, and any changes or additions that do not depart from the gist of the invention are also included in the invention. The present invention has the following effects. According to the present invention, when taking out the cut tube after the cutting, the rotating tool portion is moved from the cut portion of the cut tube to the tube cutting device side. Since the separation standby is performed, the work of taking out the cutting tube is facilitated. [0069]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a first embodiment of a tube cutting device of the present invention,
It is the whole figure which shows the state which attached the pipe cutting device to the pipe. Figure 2 is an illustration of the first tube cutting method. FIG. 3 is an explanatory diagram of a second tube cutting method . FIG. 4 is an explanatory view of a third tube cutting method . FIG. 5 shows a first embodiment of a tube cutting device of the present invention,
It is sectional drawing of a tube cutting apparatus. FIG. 6 is an overall view at the time of cutting off a pipe without water. [Description of Signs] 1 Pipe cutting device 2a, 2b Fixed pipe 3 Cutting pipe 4 Rotary tool 5 Frame 6 Axial cutting moving means 7 Revolving cutting moving means 8 Retreat means 9 Housing 10 Drive source 11 Hydraulic cylinder 12 Piston 13 Hollow rod 14 Holder 15 Composite bearing 16 Spline 17 Revolving shaft 18 Bevel gear 19 Drive source 20a, 20b Guide chain 21 Drive unit 22 Drive source 23 Sprockets 24a, 24b Sprocket 25 Traction chains 26a, 26b Wheel 27 Rotary shaft C Cutting part P Tube B Case

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B23C 3/00

Claims (1)

(57) [Claims 1] A tube cutting device is installed on the outer periphery of a predetermined portion of a fixed tube, and the tube and the tube cutting device are surrounded by a housing to prevent water interruption. A pipe cutting device used for pipe cutting work, wherein the pipe cutting apparatus is a rotary tool that is driven to rotate, and is fixed to a frame in an axial direction with the rotary tool facing the center of the pipe. An axial cutting moving means for moving, and a predetermined portion of the fixed pipe body
On the outer circumference of the minute together with the axial cutting and moving means
Capable provided, a turning cutting moving means for cutting moving said rotary tool in the circumferential direction of the tubular body, said after tube cutting
Tube cutting apparatus, characterized in Tei Rukoto is composed of a saving means of separating movement from the cutting portion the rotary tool to the tube cutting apparatus.