JPH0646575Y2 - Pipe end groover - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a pipe end for press-molding an annular peripheral groove on a pipe end peripheral wall when a joint is applied to the pipe end of a pipe for guiding a fluid, for example, a gas pipe. A groover.

[Conventional technology]

As is well known, various pipe joints are used in pipe laying work such as gas pipes or water pipes, and an annular peripheral groove is formed in the peripheral wall of the pipe end in such joints. There are those that require. That is, such a joint is provided with an engagement portion adapted to mechanically engage the annular peripheral groove of the pipe end, whereby a mechanical connection between the joint and the pipe end is achieved. is there. Therefore, when using such a type of joint, it is necessary to appropriately form an annular peripheral groove on the end of the pipe cut to an appropriate size at the pipe laying site.

As a pipe end grooving device used for forming such an annular peripheral groove, an annular grooved drive roller and a front and rear direction with respect to the annular grooved drive roller so as to engage with the annular groove of the annular grooved drive roller. It is known to include a rotary driven roller that can move in any direction. In such a pipe end groover, the rotary driven roller is gradually inserted into the annular groove of the annular grooved drive roller with the pipe end wall sandwiched between the annular grooved drive roller and the rotary driven roller. By pushing, the annular peripheral groove is press-formed on the peripheral wall of the tube end. More specifically, an annular grooved drive roller is applied to the inner wall surface of the tube end, while a rotary driven roller is applied to the outer wall surface of the tube end so that the tube end wall is formed between the annular grooved drive roller and the rotary driven roller. Will be sandwiched between.
When the annular grooved drive roller is rotationally driven in such a state, the tube is rotated in such a manner that the annular grooved drive roller rolls on the inner wall surface of the tube end, and at this time, the rotary driven roller is rotated. When it is gradually pressed toward the annular grooved drive roller so as to enter the annular groove, it is sandwiched between the annular grooved drive roller and the rotary driven roller, and the portion of the pipe end wall is plastically deformed. As a result, an annular peripheral groove is formed at the pipe end.

[Problems to be solved by the device]

Now, while grooving the pipe end wall of the pipe by the pipe end grooving device as described above, the other pipe end is held by the operator's hand, or is freely rotatable by an appropriate holding tool. Held in. In this case, the grooved tube end side receives a force that tries to come out of the annular grooved drive roller while making a spiral motion in the left or right direction depending on the rotational driving direction of the annular grooved drive roller. For example, if the annular grooved drive roller is driven to rotate clockwise or clockwise as viewed from its front, the grooved tube end tends to exit the annular grooved drive roller in a clockwise spiral. In order to prevent this, during grooving, it is necessary to hold the pipe in a state of being inclined about 2 ° to the left in the horizontal plane with the end side of the grooving pipe as the center. On the other hand, when the annular grooved drive roller is driven to rotate in the counterclockwise direction, that is, the counterclockwise direction when viewed from the front, the grooved tube end tends to come out in the counterclockwise direction, so that the tube is moved to the right in the horizontal plane. It is necessary to incline about 2 °.

In the conventional pipe end grooving device, when the pipe end on the side opposite to the grooved pipe end is held by the operator's hand, the worker slightly tilts the pipe on either side. The force is applied to the tube end on the opposite side so as to allow it. However, when the operator is inexperienced, it is difficult to keep the pipe inclined at a predetermined angle during the grooving process, and as a result, grooving at the pipe end may not be performed well. is there. Further, when the pipe end opposite to the grooved pipe end is rotatably held by a suitable holder, it is necessary to set the pipe at a predetermined inclined position. There is no standard for tube positioning,
For this reason, setting the inclination position of the pipe was relatively troublesome.

Therefore, the purpose of the present invention is to enable even an inexperienced operator to hold the pipe in a proper tilt position during the grooving operation,
Also, to provide a pipe end grooving device configured so that the inclination position of the pipe can be easily set when the pipe end opposite to the grooved pipe end is rotatably held by an appropriate holder. Is.

[Means for Solving the Problems]

The pipe end grooving device according to the present invention comprises an annular grooved drive roller and a rotary driven roller movable in the front-rear direction with respect to the annular grooved roller so as to engage with the annular grooved roller. A pipe end by gradually pushing the rotary driven roller into the annular groove of the annular grooved drive roller with the tube end wall sandwiched between the annular grooved drive roller and the rotary driven roller. An annular peripheral groove will be pressed into the peripheral wall. According to the present invention, in such a pipe end grooving device, an elongated gauge element is extended along an axis of rotation of the annular grooved drive roller at an appropriate position on the side where the annular grooved drive roller is arranged. When the drive roller with an annular groove is driven to rotate clockwise when viewed from the front, the gauge element is tilted to the left by about 2 ° with respect to the rotation axis of the drive roller with an annular groove in the horizontal plane, and When the annular grooved drive roller is driven to rotate counterclockwise when viewed from the front thereof, the gauge element is inclined about 2 ° to the right in the horizontal plane with respect to the rotation axis of the annular grooved drive roller. It is said that

[Action]

As is apparent from the above configuration, in the pipe end groover according to the present invention, the long gauge element is provided with a horizontal plane of about 2 ° on either side depending on the rotational driving direction of the annular grooved drive roller. Since it is tilted inward, if the operator holds the tube by hand during the grooving operation, the operator may hold the tube parallel to the gauge element and If the pipe is held by the holder, the pipe is set in a predetermined inclined position by holding the pipe in parallel with the gauge element. It will be.

〔Example〕

An embodiment of the pipe end groover according to the present invention will now be described with reference to FIGS. 1 to 4 of the accompanying drawings.

Referring to FIGS. 1 and 2, the whole pipe end grooving device according to the present invention is shown as a front view and a side view, respectively, the base end grooving device having a substantially rectangular shape. It is equipped with. Three legs 12 extend from the bottom of the base plate 10, and these three legs 12 enable the base plate 10 to be stably installed even in a pipe laying site where scaffolding is poor.

A grooving device main body 14 is placed on the base plate 10, and the grooving device main body 14 includes a frame housing 16. The front side wall surface of the frame housing 16 (that is, the first
The shaft is projected from the wall surface shown in the figure, and the drive roller 18 with an annular groove is attached to the nut at the protruding end of this shaft.
Fixed by 20. The shaft is rotatably held by a suitable bearing provided in the frame housing 16 and is operatively connected to the output shaft of a suitable drive motor via a reduction gear. In this embodiment, the annular grooved drive roller 18 is driven to rotate clockwise, that is, clockwise when viewed from the front (FIG. 1). The drive motor is arranged in a motor housing portion 16b which is a part of the frame housing 16, and the start and stop of the drive motor include an ON switch button and an OFF switch button 21a of a switch board 21 provided on a side wall of the frame housing 16. It is done by 21b.

As is apparent from FIG. 2, the frame housing 16 includes an overhanging protruding portion 16a that extends above the annular grooved drive roller 18 in the form of an overhang, and a hydraulic piston cylinder 22 is attached to the top of this protruding portion 16a. . The actuating rod of the hydraulic piston cylinder 22 penetrates the top wall of the overhanging portion 16a and extends vertically downward on the drive roller 18 with an annular groove.
Of the rotary driven roller 24 at its lower end.
Is rotatably attached. That is, the bearing holder 26 (Fig. 2) is attached to the lower end of the operating rod of the hydraulic piston cylinder 22.
Is attached, and the rotation driven roller 24 is axially attached by the bearing holder 26.

The hydraulic piston cylinder 22 is a mounting bracket on the base plate 10.
Hydraulic supply cylinder 28 and hydraulic hose 30 mounted on 25
The hydraulic piston cylinder 2 is connected by operating the hydraulic operating lever 28a of the hydraulic supply cylinder 24.
The second actuating rod is moved up and down, whereby the rotary driven roller 24 is moved back and forth with respect to the annular grooved drive roller 18, and the annular groove 18 of the annular grooved drive roller 18 is moved.
It is designed to be able to break into a.

The working rod of the hydraulic piston cylinder 22 is incorporated with a vertical rod element 22a that moves up and down accordingly, and the upper end of this vertical rod element 22a penetrates the top wall of the frame housing 16 and is projected to the outside (Fig. 2). ). The protruding upper end of the vertical rod element 22 is threaded, and the stopper element 22b is screwed therein. That is, the stopper element 22b
The lower flange portion is adapted to abut against the top wall of the frame housing 16, whereby the downward stroke of the operating rod of the hydraulic piston cylinder 22 is restricted. Regarding the downward stroke, the vertical rod element 22
It can be adjusted by changing the screwing position of the stopper element 22b with respect to a.

The structure described above is substantially the same as that of the conventional pipe end grooving device, but the pipe end grooving device according to the present invention has a suitable position on the side where the annular grooved drive roller is arranged, that is, on the front side thereof. And is characterized by an elongated gauge element extending along the axis of rotation of the annular grooved drive roller.

In this embodiment, such gauge element is a rod-shaped gauge member.
32, the rod-shaped gauge member 32 is supported by a sleeve member 34 attached to the left side wall surface of the frame housing 16 when the frame housing 16 is viewed from the front (FIG. 1). Is extended along the rotation axis of the annular grooved drive roller 18 so as to project from the front wall of the. As is apparent from FIGS. 1 and 3, the rod-shaped gauge member 32 is tilted in the horizontal plane to the left with respect to the rotation axis A of the annular grooved drive roller 18 when viewed from the front (FIG. 1). The inclination angle is about 2 °.

Preferably, as shown in FIG. 1, a rod-shaped gauge member
32 is arranged so that its longitudinal axis is included in a horizontal plane including the rotation axis of the annular grooved drive roller 18, and the longitudinal axis of the rod-shaped gauge member 32 and the rotation axis of the annular grooved drive roller 18 are Need not necessarily be included in the same horizontal plane. In this embodiment, the rod-shaped gauge member is used.
32 was supported on the left wall of the frame housing 16,
It may be supported on the right side wall surface, or may be supported so as to project from the front side wall surface of the frame housing 16.

In the present embodiment, as described above, since the annular grooved drive roller 18 is rotationally driven in the clockwise direction when viewed from the front, the tilt direction of the rod-shaped gauge member 32 is the left side when viewed from the front. However, when the annular grooved drive roller 18 is driven to rotate in the counterclockwise direction when viewed from the front, the inclination direction of the rod-shaped gauge member 32 is the right side when viewed from the front. .

Next, with reference to FIG. 3 and FIG. 4, the operation of the pipe end groover described above will be described.

As shown in FIGS. 3 and 4, after the pipe P to be grooved is installed in such a manner that the annular grooved drive roller 18 is inserted into its pipe end, the rotary driven roller 24 is lowered. As a result, the tube end wall is sandwiched between the annular grooved drive roller 18 and the rotary driven roller 24. In this state, the drive roller 18 with the annular groove is rotated in the clockwise direction (first
(In the drawing), the pipe P is rotated in such a manner that the annular grooved drive roller 18 rolls on the inner wall surface of the pipe end, and in this state, the rotary driven roller is rotated.
When 24 is lowered by the hydraulic piston cylinder 22 and entered into the annular groove 18a of the annular grooved drive roller 18, as shown in FIG. 4, an annular peripheral groove is formed on the pipe end peripheral wall of the pipe P. Will be done.

During such grooving, the operator holds the tube P parallel to the rod-shaped gauge member 32, so that the tube P has a longitudinal axis B which is the rotational axis of the annular grooved drive roller 18. It is maintained at a position inclined to the left side by about 2 ° with respect to A, whereby the pipe end of the pipe P is prevented from being pulled out from the annular grooved drive roller 18, and proper grooving can be achieved. It will be. Further, when the pipe P is rotatably held by a holder, if the pipe P is held so as to be parallel to the rod-shaped gauge member 32, the pipe P can be easily set at a predetermined inclined position. Can be done.

Although the rod-shaped gauge member 32 is used as the gauge element in the above-described embodiments, the gauge element does not necessarily have to be a rod-shaped member, and other shaped members such as a plate-shaped member or an L-shaped member may be used. It may be.

[Effect of device]

As is clear from the above description, in the pipe end grooving device according to the present invention, by using the gauge element, even an inexperienced worker can maintain the pipe in an appropriate inclined position during the grooving work. In addition, when the pipe is held by the holder, the pipe can be immediately set to the proper tilt position.

[Brief description of drawings]

1 is a front view of a pipe end groover according to the present invention, FIG. 2 is a side view of the pipe end groover of FIG. 1, and FIG. 3 is a main part of the pipe end groover of FIG. FIG. 4 is a partial plan view showing the grooving operation of the pipe end grooving device according to the present invention. 10 ... Base plate 12 ... Legs 14 ... Grooving device body 16 ... Frame housing 18 ... Annular grooved drive roller 18a ... Annular groove 22 ... Hydraulically actuated piston cylinder 24 ... Rotation driven roller 28 ... Hydraulic supply cylinder 32 ... Rod gauge Element

Claims (1)

[Scope of utility model registration request] 1. A drive roller having an annular groove, and a rotary driven roller movable in the front-rear direction with respect to the annular groove roller so as to engage with the annular groove of the annular groove roller. A pipe end peripheral wall by gradually pushing the rotary driven roller into the annular groove of the annular grooved drive roller with the tube end wall sandwiched between the annular grooved drive roller and the rotary driven roller. In a pipe end grooving device that press-forms an annular peripheral groove in a ring-shaped groove, a long gauge element is extended along an axis of rotation of the annular grooved drive roller at an appropriate position on the side where the annular grooved drive roller is arranged. When driving the annular grooved drive roller clockwise when viewed from the front thereof, the gauge element is tilted to the left by about 2 ° with respect to the rotation axis of the annular grooved drive roller in the horizontal plane. , Again When the grooved drive roller is driven to rotate counterclockwise as viewed from the front thereof, the gauge element is inclined to the right about 2 ° with respect to the rotation axis of the annular grooved drive roller in the horizontal plane. Characterizing pipe end grooving device.