JPH0112892Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cutting device for cutting a bulging weld on the outer peripheral surface of a welded portion of butt-welded steel pipes.

Conventionally, this type of device includes a rotary tool driving motor a which can freely rotate in the circumferential direction of the outer circumferential surface of steel pipes and can also freely move in the radial direction of the steel pipes, as shown in FIG.
A feed motor b is provided with a drive wheel that rotates in contact with the outer circumferential surface of the steel pipes, and the motors a and b are set on the outer circumferential surface of the steel pipes by winding freely in the circumferential direction of the outer circumferential surface of the steel pipes. Dovetail grooves are formed on the front and rear surfaces of the mounting base d of the rotary tool driving motor a, and dovetail grooves f having rollers e are slidably fitted into these dovetail grooves, respectively. The tips of the adjusting bolts h, h screwed onto the support pieces g, g protruding from the outer surface of the mounting base d, are screwed into the dovetails f, f, respectively, and the mounting base is fixed by rotating these bolts h, h. d
It is known that the grinder i is advanced toward the steel pipe, and the grinder i attached to the output shaft of the motor a is brought into contact with the outer peripheral surface of the steel pipe (Japanese Unexamined Patent Application Publication No. 1983-1999).
Publication No. 88895). However, when using this conventional device to cut a bulging weld on the outer peripheral surface of butt-welded steel pipes, the adjustment bolt is adjusted so that the grinder i hits the bulge weld. It is necessary to repeat the adjustment and cutting the bulging weld using the grinder so that the outer circumferential surface of the weld is flush with the outer circumferential surface of the steel pipe, which takes time and effort. However, it had the disadvantage of poor work efficiency. The purpose of this invention is to provide a cutting device that eliminates these drawbacks and significantly improves work efficiency.The main feature of this invention is that it cuts into two parts on the outer peripheral surface of butt-welded steel pipes. A split tube that can be split is inserted and fixed to the steel pipes with a plurality of fixing bolts, and a face milling cutter that cuts the bulging weld and a roller that rotates on the outer peripheral surface are connected to the tip cutting surface of the face milling cutter and the roller. a split annular plate rotatably engaged with the split tube; The two are connected by a tightening bolt at the opposing connecting flange.

An embodiment of the present invention will be described below with reference to FIGS. 2 to 5.

Reference numerals 1 and 1 indicate a split tube that is divided into two pieces, and these split tubes 1 and 1 are inserted into the steel pipe A and then tightened with tightening bolts 2 and 2 at the opposing connecting flange edges 1a and 1a at the ends, respectively. At the same time, fixing bolts 3...3 are screwed into the circumferential walls of the split tubes 1, 1 at predetermined intervals so as to be fixed to the steel pipe A.

4a, 4a indicate split annular plates that are divided into two pieces, and these split annular plates 4a, 4a are connected to the engaging portion 4 thereof.
At c, the tubes 1, 1 are each slidably engaged with the metal 1c of the protrusion 1b on the outer circumferential surface thereof, and are tightened by the tightening bolts 5, 5 at the opposing connecting protrusions 4b, 4b at the respective ends. It is formed into an annular plate 4 that can be rotated.

Reference numeral 6 denotes a drive device for rotating the annular plate 4 provided in the split tube 1, and the drive device 6 includes a motor 6.
a, a reducer 6b, and a worm 6c, the worm 6c is meshed with a gear 7 formed on the outer peripheral surface of the split annular plates 4a, 4a, and the reducer 6b, worm 6c, and gear are driven by the motor 6a. The annular plate 4 was gradually rotated through the rotation mechanism 7.

Reference numeral 8 indicates a support body, and the support body 8 is formed into a frame shape and is fixed to the split annular plate 4a, and the sliding body 10 is slidably engaged with guides 9, 9 within the support body 8. are combined.

Reference numeral 11 indicates a bearing body of the rotating shaft 12, and the bearing body 1
1 is slidably fitted into the central through hole of the sliding body 10, and a connecting plate 13 is fitted on the inner end surface of the bearing body 11.
is fixed, and the connecting plate 13 is movably connected to the sliding body 10 at its periphery by connecting rods 14, 14 within a predetermined distance, and there is no interference between the sliding body 10 and the connecting plate 13. Spring 15,1
The connecting plate 13 is separated from the sliding body 10 by the repulsion of 5.

16 is a decelerator provided above the support 8;
7 indicates a motor provided on the side of the reducer 16,
The reducer 16 includes a large bevel gear 16a fixed to the rotating shaft of the motor 17, and a small bevel gear 16b slidably connected to a long groove 18 formed on the side surface of the upper end of the rotating shaft 12 via a key 19. The rotary shaft 12 is rotated by the drive of the motor 17 via the large bevel gear 16a, the small bevel gear 16b, and the key 19.

20 is a handle for advancing and retracting the sliding body 10; 21;
a is a small helical gear fixed to the shaft of the handle 20, 21b is a large helical gear that meshes with the small helical gear 21a, and 22 is a screw rod fixed to the center of the large helical gear 21b. The screw rod 22 is screwed into the screw hole of the protruding portion 10a protruding from the periphery of the sliding body 10, and by rotation of the handle 20, the small helical gear 21a, the large helical gear 21b, The sliding body 10 is moved forward and backward toward the steel pipe A within the support body 8 via the screw rod 22.

Reference numeral 23 indicates a roller pivotally mounted on the lower surface of the connecting plate 13, and reference numeral 24 indicates a face milling cutter inserted into the hole 26 at the lower end of the rotating shaft 12.
The insertion of the face milling cutter 24 into the hole 26 is adjusted so that the tip cutting surface of the roller 23 and the tip surface of the circumferential surface of the roller 23 are flush with each other, and the face milling cutter 24 is fixed with a fixing bolt 25. Incidentally, reference numeral 27 denotes a clutch lever that disconnects and disconnects the transmission of the rotational force of the motor 6a to the annular plate 4.

Next, the operation of the above embodiment device will be explained.

Split tubes 1, 1 are placed near the welding point of steel pipe A connected by butt welding, and these are tightened with tightening bolts 2, 2, and fixed to steel pipe A by screwing fixing bolts 3...3, and further tightened. By tightening the bolts 5, 5, the split annular plates 4a, 4a are integrated into the annular plate 4. After that, the handle 20 is rotated to advance the sliding body 10 toward the steel pipe A, and the face milling cutter 24
The cut surface of is applied to the bulging weld B as shown by the dotted lines in FIGS. 4 and 5. Here, the sliding body 10 is advanced until the stoppers 28, 28 at the outer ends of the connecting rods 14 are separated from the outer end surface of the sliding body 10 by a predetermined distance. Then, the motor 17 is driven to rotate the face milling cutter 24 to cut the bulging weld portion B. Here, as this cutting progresses, the face milling cutter 24 further gradually advances due to the elasticity of the springs 15, 15, and cutting is performed until the roller 23 comes into contact with the outer circumferential surface of the steel pipe A, and the outer circumference of the welded part B. The surface will automatically become flush with the outer peripheral surface of steel pipe A. While cutting the outer circumferential surface of the welded part B until it becomes flush with the outer circumferential surface of the steel pipe A, the support body 8 is moved over the outer circumferential surface of the steel pipe A together with the annular plate 4, and the outer circumferential surface of the steel pipe A is cut. Cutting is performed around the entire circumference and the operation is stopped. Then, remove the cutting device from the steel pipe A by reversing the procedure described above. Here, the bulging weld part B
Since the cutting is performed by the face milling cutter 24, the cutting is done quickly, and the cutting is completed by rotating the support 8 over the entire circumference of the steel pipe A once.

In this way, according to the present invention, a split tube that can be divided into two parts is fixed on the outer circumferential surface of a butt-welded steel pipe using fixing bolts, and a split ring-like body equipped with a support body holding a face milling cutter and a roller is also attached to the outer peripheral surface of the butt-welded steel pipes. The connecting flange is formed into an annular plate connected by a tightening bolt, and the annular plate engages with the split tube and rotates, so even if a reaction force is applied during cutting with a face milling cutter, the annular plate will not be affected. The face milling cutter can precisely cut the entire circumference of the steel pipe without shifting in the direction of the outer circumference, and in addition, a split tube that can be divided into two is fixed on the outer circumference of the butt-welded steel pipe using a fixing bolt. At the same time, the split annular plate, which is equipped with a support body holding a face milling cutter and rollers and is rotatably engaged with the split tube, is also connected by a tightening bolt at their opposing connecting edges, so that it is possible to butt-weld steel pipes. Even if the pipe is long, the cutting device can be attached directly to the butt weld by connecting the split tube or split annular plate with bolts, without having to insert the split tube or split annular plate into the steel pipe from the end. This has the effect of making it easier to install and remove the cutting device.

[Brief explanation of the drawing]

Fig. 1 is a front view of the conventional device, Fig. 2 is a partially cut-away front view of one embodiment of the device of the present invention, Fig. 3 is a partially cut-away plan view, and Fig. 4 is a longitudinal cross-section of the main part. FIG. 5 is a cross-sectional view taken along the - line. 8...Support body, 23...Roller, 24...Front milling cutter, A...Steel pipe, B...Bulging welded portion.

Claims (1)

[Scope of utility model registration request] A split tube that can be divided into two is inserted onto the outer peripheral surface of the butt-welded steel pipes, and is fixed to the steel pipes with a plurality of fixing bolts, and a face miller that cuts the bulging weld portion rotates on the outer peripheral surface. The annular plate is provided with a support that allows the cutting surface of the face milling cutter and the tip surface of the circumferential surface of the roller to be kept on the same plane and to control the movement of the roller back and forth toward the outer circumferential surface. 1. A cutting device for cutting a bulge weld of butt-welded steel pipes, characterized in that a split annular plate rotatably engaged with a cylinder is connected by a tightening bolt at opposing connecting edges.