JPH0415432Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The invention relates to an automatic pipe welding machine head, which enables accurate clamping of welded pipes on both sides of the center line, regardless of whether they are thick or thin. It has a field of use.

(Prior Art) A pipe holder main body 1 includes a first circular hole 2 with a first pipe insertion port 3 opened at the hole edge, and a pipe holder main body 1 provided with a first circular hole 2 having a first pipe insertion port 3 opened on the hole edge, and a second pipe insertion port 7 disposed on the main body. 1
A conventional automatic pipe welding machine head is equipped with a similar ring-shaped welding torch support plate that matches the pipe insertion opening 3 and rotates once by a small gear 15, as shown in FIG. , one end of each of a pair of swing levers b is pivotally supported, and a clamp e having a clamp end face f facing approximately the center c of the first circular hole d is integrally provided at each free end of the swing lever, Each of the swing levers is provided with a threaded rod h in which a screw with the lead direction of a freely rotatable nut g is screwed together, and when the thickness of the welded pipe changes, the For a welded pipe Pa, the clamp end face f touches both sides of the center line as shown by the chain line, but for a welded pipe Pb of a certain thickness, the clamp end face f is at a position slightly shifted from both sides of the center line as shown by the dotted line. There is a disadvantage that the clamp end face f is in contact with the clamp end face f, and in any case, it is not possible to accurately crank both sides of the center line of the pipe.

(Problems that the invention aims to solve) Conventional automatic pipe welding machine heads are designed to be lightweight so that they can be handled easily by holding the handle, so they have the drawbacks mentioned in the previous section. Although this is ignored, it is better to clamp welded pipes Pa, Pb, etc. of different thicknesses on both sides of the center, respectively, and pipes that cannot be securely clamped on both sides of the center should be clamped during welding. The electrode of the welding torch cannot be rotated concentrically with the center of the welding pipe, which causes uneven welding. The present invention aims to improve the automatic pipe welding machine head, which has such drawbacks, with almost no change in weight, and at the same time, it is acceptable to make some sacrifices in manufacturing. It is.

(Means for Solving the Problems) The purpose of the present invention is to solve the problems mentioned in the previous section.Specifically, the clamp head at each end is attached to the bottom surface of the pipe holder body 1 with a first cutout. A pair of clamp pieces 22 oriented toward the center of the circular hole are slidably provided, and one end of the clamp pieces 22 is pivotally supported on the lower surface of the pipe holder body 1 by a shaft 26 on both sides of the first pipe insertion opening 3. A pair of long swinging levers 25 are provided on both sides of the first circular hole 2, and a nut 28 that swings in contact with the holder is connected near the shaft 26 of each lever 25. A threaded rod 29 having screws 30 with opposite lead directions screwed into the nut 28 is provided to connect each clamp piece 22 and the free end of each swing lever 25.

(Embodiment) Figures 1 to 3 show an embodiment of the present invention, in which 1 is a pipe holder main body, which is provided with a first circular hole 2 with a first pipe insertion opening 3 opened at the hole edge; Round hole 2
An occluded circular fitting concave surface 4 is provided around the concave surface 4.
A concentric ridge 5 is provided on the ridge. Reference numeral 6 denotes a ring-shaped welding torch support plate which is fitted into the fitting concave surface 4 and placed on the upper surface of the pipe holder main body 1 so that rotation is guided by the protuberances 5. A second circular hole 8 is formed with a second pipe insertion opening 7 that matches the second pipe insertion opening 7, and a large gear 9 with a portion missing is provided on the outer periphery. A handle 10 containing a built-in drive motor is attached to the pipe holder body 1 on the side opposite to the first pipe insertion port 3, and a bevel gear-shaped gear 11 fixed to the main shaft of the motor protrudes above the pipe holder 1 body. A small gear 13 concentric with the bevel gear 12 driven by the bevel gear 11, a center gear 14 on both sides of the small gear 13, and small gears 15 on both sides of the small gear 13 are provided.
The welding torch support plate 6 is rotated once by controlling the drive of the motor. Reference numeral 16 denotes a cover fixed to the upper surface of the main body 1, covering a part of the welding torch support plate 6 and the gear group described above.

The present invention provides an automatic pipe welding machine head having the above-mentioned configuration, in which a pair of sliding holes are provided on the lower surface of the pipe holder body 1 on a diameter line perpendicular to the diameter line of the first circular hole 2 passing through the center of the pipe insertion opening 3. Dynamic grooves 21, 21 are provided, and a pair of clamp pieces 22, 22 pointing toward the center of the first circular hole 2 are slidably fitted into the sliding grooves 21, 21. At the tips of the clamp pieces 22, 22, as shown in FIG. 2, clamp heads 23, 23 having V-shaped notches protrude slightly into the circular hole 2, and connecting pins 24, 24 protrude from the lower surfaces. do.

Further, on the lower surface of the pipe holder main body 1, near the handle 10, one end of a swinging lever 25, 25 is attached to the main body 1 by a shaft 26, 26, and the free end is overlapped with the lower surface of the clamp piece 21, 21, and the swinging direction is adjusted. The connecting pins 24, 24 are inserted into the elongated holes 27, 27 perpendicular to the
Insert and connect.

Further, nuts 28, 28 are rotatably connected to the upper surfaces of the swing levers 25, 25 near the shafts 26, 26,
Screw 3 with opposite lead direction on each nut
Pass the threaded rod 29 screwed with the threaded rod 29, fit the positioning nuts 31, 31 on the outside of the pipe holder body 1 of the threaded rod 29, and then attach the rotating handle 32.
to be fixed. 33 is a back cover provided on the lower surface of the pipe holder main body 1 to cover the swing lever 25 and the clamp piece 22.

(Function) In the present invention, when the threaded rod 29 is rotated, the pair of swinging levers swing from the position indicated by the chain line in FIG. The pair of clamp pieces 29 in position move linearly in the corresponding direction as shown by the solid line,
The welded pipe f, which is fitted relatively through the first pipe insertion port 3 and the second pipe insertion port, is sandwiched between the head 23 of the clamp piece 22 and automatically fitted and fixed to the center of the second circular hole. , even if the outer diameter of the welded pipe f is different, this effect can be achieved even if the outer diameter of the welded pipe f is different, and the second
There is no change in the effect of fixing at the center of the circular hole 2.

(Effects) Unlike conventional clamp devices, this invention
The threaded rod 2 is rotated separately from the pair of clamp pieces 22 that slide toward the center of the circular hole 2.
A swing lever 25 is provided which swings by a lever 9, and the clamp piece 22 and the free end of the swing lever 25 are connected. The clamp piece 22 can be converted into linear motion, and the structure of the automatic pipe welding machine head does not change at all, so even if the diameter of the welded pipe changes, all It has a unique effect that allows it to be clamped at the center of the circular hole 8, and the man-hours for manufacturing and assembly are slightly increased compared to conventional ones. It has the effect of automatically applying clamping.

[Brief explanation of the drawing]

Figures 1 to 3 show an embodiment of the present invention, with Figure 1 being a partially cutaway plan view and Figure 2 excluding the back cover 33.
FIG. 3 is a partially cutaway back view, and FIG. 3 is a partially cutaway side view. FIG. 4 is a schematic diagram of a conventional device. DESCRIPTION OF SYMBOLS 1... Pipe holder body, 2... First circular hole, 3... First pipe insertion port, 6... Welding torch support plate, 7... Second pipe insertion port, 8... Second notch Circular hole, 9...Large gear, 15...Small gear, 22
... Clamp piece, 23 ... Clamp head, 24
... Connecting pin, 25 ... Swing lever, 26 ...
Shaft, 27...long hole, 28...nut, 29...threaded rod, 30...screw.

Claims (1)

[Claims for Utility Model Registration] First circular hole 2 opening the first pipe insertion port 3
A pipe holder main body 1 comprising a pipe holder main body 1, and a similar ring type disposed on the main body 1 so that the second pipe insertion port 7 coincides with the first pipe insertion port 3 and rotates on the pipe holder main body 1 by a small gear. In the welding torch support plate 6, clamp pieces 22, 22 having clamp heads 23, 23 formed at each tip facing toward the center of the first notched circular hole 2 are attached to the lower surface of the main body 1. A pair of swinging levers 25, 25 are provided on both sides of the first circular hole 2, and are slidably arranged and swingably supported on the main body 1 by shafts 26, 26, and the lead directions are opposite. An adjustment threaded rod 29 provided with screws 30, 30 is supported on the main body 1, and each of the screws 30,
2. An automatic pipe welding machine head characterized in that nuts 28, 28, which are screwed into the respective parts 30, are axially connected to the swing levers 25, 25.