JPH0244935Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an automatic pipe welding machine head that prevents the welding machine from over-tightening a pair of clamp pieces provided on the welding machine and causing them to bite into the outer periphery of the welded pipe. It has a field of use in eliminating damage to pipes or making unclamping difficult.

(Prior Art) A pipe holder main body 1 is provided with a first circular hole 2 with a first pipe insertion port 3 opened at the hole edge, and a second pipe insertion port 7 arranged on the main body 1 is provided. It matches the insertion port 3 of the first pipe, and the small gear 1
The automatic pipe welding machine head is equipped with a similar ring-shaped welding torch support plate 6 that is driven one rotation by the
A clamping mechanism is provided in which the threaded rod is rotated in two directions, a clamping direction and a clamp release direction, by a rotary handle that protrudes from the outside of the pipe holder body 1, and the clamp piece is moved in two directions. There is no device that prevents the clamp piece from digging into the welded pipe excessively when the clamp piece rotates in the clamping direction. For this reason, when the threaded rod is rotated in the clamping direction using the rotary handle on a body that has been completely clamped, the clamp piece will gain momentum and bite into the outer periphery of the welded pipe excessively, causing damage, or the threaded rod and handle may move in the direction of releasing the clamp. It has the disadvantage of making reverse rotation difficult.

(Problems to be Solved by the Invention) Since the conventional automatic pipe welding machine head has the drawbacks mentioned in the previous section, the problem of the invention is to solve such excessive clamping with a simple structure.

(Means for Solving the Problems) The present invention aims to solve the problems mentioned above, and specifically, a flange is provided at one end of the threaded rod 29 protruding from the pipe holder body 1. 32
Further, a rotary handle 34 is fitted to one end of the threaded rod 29 so as to rotate freely, an engaging element 42 is provided on one of the facing surfaces of the collar 32 and the rotary handle 34, and the engager 42 is protruded by a spring 41, and the other engager 42
A circular engaging groove 44 is provided in which the engaging member 42 is fitted, an inclined surface 45 is provided at one edge in the rotational direction of the engaging groove 44, and an upright edge 46 is provided at the other edge for locking the engaging element 42 in an irremovable manner. When the rotary handle 34 is rotated in the clamping direction together with the threaded rod 29 and the resistance increases as the welded pipe is completely clamped, the ejecting spring 41 is overcome by the resistance and the engagement element 42 is rotated.
This feature is characterized in that the rotating handle 34 can be freely rotated in the direction of the clamp.

(Function) A clamp piece 22 that moves the welded pipe a relatively to the first pipe insertion port 3 and the second pipe insertion port 7 and projects into the circular hole 2 of the pipe holder main body 1;
22, and when the rotary handle 34 is rotated in the clamping direction, the engager 42 provided on either one of the corresponding surfaces of the collar 32 and the rotary handle 34 engages the spring 41. It stays fitted in the engagement groove 44 due to elasticity, moves the threaded rod 29 in the clamping direction, and tightens the screws 30, 3.
0 causes the clamp heads 23, 23 of the clamp pieces 22, 22 to move closer to the outer periphery of the welded pipe, but as soon as the clamping is completed, resistance is generated, making it difficult to rotate the threaded rod 29. Since the resiliency of the ejecting spring 41 is lost due to the above-mentioned increase in resistance, when the rotary handle 34 is still rotated in the clamping direction, the engager 42 moves into the engagement groove 4.
4, and only the handle 34 rotates, hardly increasing the clamping pressure.

(Effects) The present invention has the above-described structure and operation, and when the rotation handle 34 is rotated in the clamping direction, the engagement element 42 to which the elastic force of the ejection spring 41 is applied is moved into the engagement groove 44 in the circular direction. Fitted into elastic contact, the threaded rod 29
The welded pipe a Do not over-clamp and damage the outer periphery.
It does not make rotation in the direction of clamp release difficult. Further, when the rotating handle 34 is reversely rotated in the direction of releasing the clamp, the engaging element 42 finds the engaging groove 44, slides on the inclined surface 45 and hits the upright edge 46, and after this collision occurs, the upright edge 4
Since it does not escape from the engagement groove 44 due to the engagement with the threaded rod 29, the clamp can be released easily under the interlocking action of the threaded rod 29.

(Example) Figures 1 to 4 show an example of the present invention.
Reference numeral 1 denotes a pipe holder main body, which has a first circular hole 2 with a first pipe insertion opening 3 opened at the hole edge, and a circular fitting concave surface 4 provided around the circular hole 2;
The concave surface 4 is provided with a concentric protuberance 5. Reference numeral 6 denotes a ring-shaped welding torch support plate which is fitted into the fitting concave surface 4 and placed on the top surface of the pipe holder main body 1 so as to guide rotation by the protrusion 5. A second circular hole 8 with a matching second pipe insertion opening 7 is formed, and a large gear 9 with a partially missing portion is provided on the outer periphery. A handle 10 containing a built-in drive motor is attached to the pipe holder main body 1 on the opposite side of 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. A small-diameter gear 13 concentric with the bevel gear 12 to be driven, an intermediate 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 pipe holder main body 1, covering a part of the welding torch support plate 6 and the gear group described above.

Sliding grooves 21, 21 are provided on the lower surface of the pipe holder main 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, so that the center of the first circular hole 2 is A pair of oriented clamp pieces 22, 22
Slide freely into place. At the tips of the clamp pieces 22, 22, as shown in FIG. 4, clamp heads 23, 23 having V-shaped notches protrude slightly into the first 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 with screws 0 and 30 screwed together, fit positioning nuts 31 and 31 on the outside of the pipe holder main body of the threaded rod, fix the collar 32 to one end so that it cannot rotate, and further attach the rotating handle 34 to one end. Only the rotation can be fitted freely. The rotation handle 34 is connected to the engagement circumferential groove 33 at the end of the threaded rod 29 and the rotation handle 3.
The engagement circumferential groove 35 on the fourth side is aligned with the engagement circumferential groove 35, and one connecting rod 36 is applied. The rotating handle 34 has a first handle piece 37 whose both sides are shaved flat, and a second handle piece 38 whose legs are fitted onto the shaved surface, which are connected by a shaft 39, and the second handle piece 37 is rotated around the shaft 39. It is designed to rotate 90 degrees.

In the present invention, an elastic spring and an engagement piece are provided on one of the corresponding surfaces of the collar 32 and the rotating handle 34, and a circular engagement groove is provided on the other side. An embodiment is shown in which the spring 41 and the engagement piece 42 are fitted into the blind hole 43, and the collar 32 is provided with an engagement groove 44 into which the protruding portion of the engagement element 42 is fitted.
When the rotary handle 34 is turned in the clamping direction, the engaging spring 41 has elasticity to join the engaging element 42 to the engaging groove 44 until the clamping is completed. The edge thereof is an inclined surface 45, and the edge in the clamp release direction is an upright edge 46 that engages to prevent the engager from escaping.

When the engagement groove 44 is provided on the rotary handle 34 side, the inclined surface 45 is provided on the rear side in the direction of rotation for clamping, and the upright edge 46 is provided on the same front side.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the present invention, in which FIG. 1 is a partially cutaway plan view, and FIG. 2 is a back view of the same, with the back cover removed. FIG. 3 is a partially cutaway plan view of the collar 32 and the rotating handle 34, and FIG. 4 is a cross-sectional view of the engagement groove 44 developed in a circular direction. 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, 32... Flange, 34... Rotating handle, 41... Ejection spring, 42... Engagement element,
43... Blind hole, 44... Engagement groove, 45... Inclined surface, 46... Upright edge.

Claims (1)

[Claims for Utility Model Registration] A pipe holder main body having a first circular hole with a first pipe insertion port opened at the hole edge, and a pipe holder main body having a first circular hole with a first pipe insertion port opened on the hole edge; It is equipped with a similar ring-shaped welding torch support plate that matches the pipe insertion opening and is rotated once by a small gear, and is further provided with a lead direction for each lever of a pair of clamps that clamp the welding pipe at the center of the first circular hole. In a device comprising a threaded rod with opposite screws screwed together, a flange is provided at one end of the threaded rod protruding from the pipe holder, and a rotating handle is fitted to one end of the threaded rod so that only rotation is possible. An engaging element that is ejected by an elastic spring is provided on one side of the facing surface of the handle, a circular engaging groove into which the engaging element is fitted is provided on the other side, and one rotational direction edge of the engaging groove is inclined. The rotating handle is rotated in the clamping direction together with the threaded rod, and when the clamping of the welded pipe is completed and the resistance increases, an ejecting spring is provided. The head of the automatic pipe welding machine is designed to overcome the resistance and allow the engaging element to escape from the inclined surface, allowing the rotary handle to rotate freely in the direction of the clamp.