JP2021074744A - Elbow cutting guiding unit - Google Patents

Abstract

To provide an elbow cutting guiding unit that is simple in preparatory work in cutting of an elbow and allows reduced cost.SOLUTION: An elbow cutting guiding unit 10 includes: a device body 13 with a placement part 12; first and second clampers C1, C2 for clamping one end of an elbow 11 onto the placement part 12; a torch movement table 15 on which a torch 14 mounted; an annular ring rail 16 arranged on an outer periphery of the elbow 11 on the placement part 12 and moving the torch movement table 15 along a cutting line L of the elbow 11; and rail journaling movement means 17 slidably provided on the device body 13 in order to vertically rotatably supporting an annular ring rail 16 in an attitude such that an end surface of the annular ring rail 16 and an end surface of the elbow 11 are flush with each other and to make a vertical rotation center of the annular ring rail 16 coincide with a bending center of the elbow 11.SELECTED DRAWING: Figure 1

Description

The present invention relates to an elbow cutting guide device used when cutting (fusing) an elbow with a torch according to the shape of the end of a connected metal pipe.

Generally, when cutting a steel pipe elbow (curved pipe) used for water and sewage pipes and air conditioning, the elbow is placed on a surface plate, and in this state, the cutting is inclined to the outer peripheral surface of the elbow. The line is marked, and then the worker (welder) cuts it with a torch on hand. Since this work requires moving the torch on hand along the inclined cutting line, the cut surface tends to be rough, and the finishing work is performed after cutting.

Therefore, as a conventional technique for solving this problem, for example, the "elbow cutting device" described in Patent Document 1 is known. In this conventional device, an elbow is placed and clamped on a mounting table that can be moved horizontally and can be raised and lowered, and in this state, the mounting table is appropriately operated to bring the cutting line of the elbow into a horizontal state. After that, while rotating the mounting table by an electric motor, the elbow is cut by a fixed torch horizontally arranged on the side of the mounting table along the cutting line. As a result, the marking work of the cutting line becomes unnecessary, and the elbow can be easily and efficiently cut.

Jikkai Sho 53-71625

However, in the "elbow cutting device" of Patent Document 1, the elbow must be clamped to the mounting table in advance, and then the elbow must be appropriately moved and tilted so that the center of the cut surface of the elbow coincides with the rotation center of the mounting table. However, the work was time-consuming.
In addition, if the elbow to be cut becomes large, the horizontal movement / elevation mechanism of the mounting table will also increase accordingly, and the rotary motor of the mounting table on which the tilted elbow will be mounted will also have a high output. It had to be, and the cost was soaring.

Therefore, the present invention has been made in view of these problems, and an object of the present invention is to provide an elbow cutting guide device which can easily prepare for cutting an elbow and can reduce the cost.

In the invention according to claim 1, the apparatus main body in which the metal elbow mounting portion is arranged, the clamper that clamps one end of the elbow to the previously described mounting portion, and the torch that cuts the elbow are attached and detached. An annular rail arranged on the outer periphery of the elbow clamped to the above-mentioned resting portion and a torch moving table mounted in a free or fixed state, for moving the torch moving table along the cutting line of the elbow. The annulus rail is detachably attached to the annulus rail so that the end face of the annulus rail and the end surface of the elbow are flush with each other, and the annulus rail is supported so as to be vertically rotatable. The elbow cutting guide is provided with a rail shaft support moving means slidably provided on the main body of the device in order to align the vertical rotation center of the ring rail with the bending center of the elbow.

The elbow cutting guide is a guide device for moving the torch along the cutting line when cutting the elbow.
The material of the elbow is not limited. Various iron and non-ferrous metals can be adopted. For example, in addition to steel pipes such as carbon steel pipes, alloy steel pipes, and stainless steel pipes, cast iron pipes, non-ferrous metal copper alloy pipes, aluminum pipes, titanium pipes, lead pipes, and the like may be used.
The size of the elbow is also arbitrary. For example, a 90 ° elbow or a 45 ° elbow may be used. The diameter of the elbow is also arbitrary. For example, it may be 10 cm to several m.
The "cutting line" here is a circular cutting line of the elbow that coincides with the radiation extending from the bending center of the arc-shaped elbow when viewed from the side.
The main body of the device is the main body of the elbow cutting guide, and its material, structure, and the like are arbitrary.
The shape of the device body is arbitrary. For example, it may be a horizontally or vertically long flat plate on which one end opening of the elbow is placed, or an L-shaped plate on which both end openings of the elbow can be placed.
As the mounting portion, for example, a mounting table having various shapes, a mounting table, or the like can be adopted. Of course, it may be a part of the main body of the device.
Of the elbows, the opening side to be mounted on the mounting portion may be the lower end side or the upper end side.
The type (structure) of the clamper is arbitrary. In short, it suffices if at least one end of the elbow (the end on the side to be mounted on the mounting portion) can be clamped (grasped). The clamper is preferably a manual type in terms of cost, but may be an automatic type.
The number of clampers used is arbitrary. It may be one or two or more.

The type of torch is arbitrary. Generally, it is a gas cutting (fusing) torch, but a laser cutting torch, a plasma cutting torch, or the like can be adopted.
The torch may be detachably attached to the torch moving table or may be fixed inseparably.
The torch moving table may be a manual type or a self-propelled type having a drive unit such as a motor.
As the material of the annular rail, for example, various metals, heat-resistant synthetic resin, and the like can be adopted.
The structure of the annular rail is arbitrary as long as the torch moving table can be moved along the cutting line of the elbow. For example, the annular rail may be configured to be bendable so that it can be used for elbows of different sizes. As a specific configuration thereof, for example, a heat-resistant soft synthetic resin rail in which a bendable core material such as a chain, a belt, or a wire is embedded can be adopted.
The size of the annulus rail is appropriately changed according to the size of the elbow. Further, a gap may or may not exist between the inner peripheral surface of the annular rail and the outer peripheral surface of the elbow. However, if there is a gap, the length of the torch protruding from the torch moving table must be changed if necessary. When there is no gap, the distance between the crater of the torch and the outer peripheral surface of the elbow is always constant, so that the torch can be easily cut.

Here, "supporting the annular rail so as to be vertically rotatable in a posture in which the end face of the annular rail and the end surface of the elbow are flush with each other" means that the axis of the annular rail is aligned with the arcuate axis of the elbow. This means that the annular rail is supported so as to be vertically rotatable while the (center line) is always in contact with the rail. The end face of the elbow is cut along the cutting line of the elbow.
The structure of the rail shaft support moving means is such that (1) the annular rail is detachably attached, and (2) the annular rail can be vertically rotated in a posture in which the end face of the rail and the end face of the elbow are flush with each other. (3) It is optional as long as the device body is slidably provided so that the vertical rotation center of the annular rail coincides with the bending center (bending center) of the elbow.

Among these, as the structure (1) for attaching and detaching the annular rail to the rail shaft support moving means, for example, a bolt-nut structure, various hooking structures, and the like can be adopted.
Further, as the (2) vertical rotation structure of the annular rail, for example, various rotation structures centered on the horizontal axis can be adopted. The vertical rotation of the annular rail may be, for example, automatic rotation by an electric motor or manual rotation by operating a handle.
Further, as a structure (3) in which the rail shaft support moving means is slidably provided on the main body of the apparatus, for example, a rail moving table or the like can be adopted. The structure, shape, number of uses, etc. of the rail moving table are not limited.

Further, in the invention according to claim 2, the apparatus main body has an upper frame material, a left frame material, a right frame material, and a lower frame material in which the above-described resting portion is arranged, and these A parallel quadrilateral frame in which adjacent ends are rotatably connected to each other, and the rail shaft support moving means is provided on the lower frame member and can slide in the length direction of the lower frame member. It is slidable integrally with the lower rail moving table between the side rail moving table, the lower rail moving table and the upper frame material, and is parallel and integrated with the left frame material and the right frame material. A slide frame material that is vertically tilted and pressed against the other end of the elbow, another clamper provided on the slide frame material that clamps the other end of the elbow, and the upper frame. An upper rail moving table provided on the material and slidable in the length direction of the upper frame material, and an upper end portion of the annular rail provided on the upper rail moving table and vertically via an upper horizontal axis. The lower end of the annular rail via a rotatably supported upper rail shaft support and a lower horizontal shaft provided on the lower rail moving table and arranged at the center of vertical rotation of the annular rail. The elbow cutting guide according to claim 1, further comprising a lower rail shaft support that vertically rotatably supports the portion.

The structure and shape of the lower rail moving table and the upper rail moving table are arbitrary.
As the material of the slide frame material, for example, various metals such as iron and stainless steel can be adopted.
The shape of the slide frame material is also arbitrary. For example, the same frame as the left and right frame members may be used.
As another clamper, for example, the same clamper for one end of the elbow can be adopted.
The structure of the upper rail shaft support portion is not limited as long as it is provided on the upper rail moving table and supports the upper end portion of the annular rail so as to be vertically rotatable via the upper horizontal shaft.
The structure of the lower rail shaft support portion is not limited as long as it is provided on the lower rail moving table and supports the lower end portion of the annular rail so as to be vertically rotatable via the lower horizontal shaft.

Further, the invention according to claim 3 is characterized in that the annular rail has a pair of left and right half-split rails obtained by vertically dividing the annular rail in half. The elbow cutting guide according to the above.
The "half-split rail" here means a rail portion on the left side obtained by evenly cutting the rail along the axis (center line) of the annular rail, and a rail portion on the right side.

Furthermore, the invention according to claim 4 is characterized in that the apparatus main body is provided with a compass that rotates another torch to cut a part of the elbow into a circle. The elbow cutting guide according to any one of claims 3.

The compass is used when making a right-angled hole in the elbow and connecting branch pipes.
The structure for attaching the compass to the main body of the device is arbitrary. For example, the connecting arm may be projected from a predetermined position of the main body of the device, and a compass may be provided at the tip of the connecting arm.
A torch is attached to the compass in a detachable or fixed state on its rotating portion.
The compass may be detachable or inseparably fixed to the device body.
The number of compasses used may be one or a plurality.

According to the elbow cutting guide device of the present invention, the elbow is placed on the mounting portion of the apparatus main body, and one end of the elbow is clamped (grasped) by a clamper. Then, for example, the rail shaft support moving means is slid (moved) along the main body of the device so that the vertical rotation center of the annular rail coincides with the bending center of the elbow. In this state, the angle at which the torch (crater) mounted on the torch moving table faces the cutting line of the elbow on the annular rail held so that the end face of the annular rail and the end face of the elbow are flush with each other. Rotate vertically to the position. As a result, in the case of the conventional device, the elbow clamped to the mounting table must be appropriately moved and tilted so that the center of the cut surface of the elbow coincides with the rotation center of the mounting table. Therefore, the preparation work for cutting the elbow becomes easy.

After that, maintaining this state, the torch moving table is moved along the annular rail, and the elbow is cut along the cutting line by the torch.
In this way, since the elbow is cut with a torch using the annular rail as a ruler, the cut surface of the elbow is less likely to become rough even when cutting by a welder, and finishing work after cutting is not required. it can. In addition, the cost can be reduced as compared with the conventional device equipped with the horizontal movement / elevation mechanism of the mounting table and the rotating motor of the mounting table.

In particular, according to the invention of claim 2, for example, when cutting a 90 ° elbow, the elbow is first placed on the mounting portion of the lower frame material of the device body having a rectangular shape, and the clamper is used. Clamp one end of the elbow.
After that, the lower and upper rail moving tables are slid in the corresponding length directions of the lower and upper frame members, respectively, so that the vertical rotation center of the annular rail coincides with the bending center of the elbow. At this time, the slide frame material in the upright state is pressed against the other end of the elbow. In this state, another clamper clamps the other end of the elbow.
Next, the torch of the torch moving table rotates vertically around the lower horizontal axis to the angle position where the torch faces the cutting line of the elbow, and the lower and upper rail shaft branches are mounted with the lower and upper ends. Let me. At this time, the upper rail moving table freely slides in the length direction of the upper frame member, and the upper rail shaft support portion freely rotates about the upper horizontal axis.
Then, while maintaining this state, the torch moving table is moved along the annular rail, and the elbow is cut by the torch along the cutting line.

On the other hand, for example, when cutting a 45 ° elbow, first, one end of the elbow mounted on the mounting portion is clamped by a clamper as in the case of the 90 ° elbow. After that, the device main body is deformed into a rhombus so that the slide frame material is tilted by 45 ° in the direction close to the elbow.
Next, while maintaining this state, the lower and upper rail moving tables are slid, respectively, so that the vertical rotation center of the annular rail coincides with the bending center of the elbow. At this time, the slide frame material inclined by 45 ° is pressed against the other end of the 45 ° elbow. In this state, the other end of the elbow is clamped by another clamper, and then the elbow is cut in the same manner as in the case of the 90 ° elbow.
As a result, regardless of the size of the elbow (for example, 90 ° elbow, 45 ° elbow, etc.), the elbow can be cut with high accuracy along a desired cutting line with a simple operation.
In addition, since the device body is a parallelogram (link) frame in which the upper frame material, the left frame material, the right frame material, and the lower frame material with the mounting portion are rotatably connected to each other, the elbow cutting guide device is used. Can be made compact.

Further, according to the third aspect of the present invention, an elbow mounted on a mounting table is sandwiched between a pair of left and right half-split rails to assemble an annular rail, and then the annular rail is attached to a rail shaft. Attached to the support means of transportation.
In this way, since the ring rail consisting of a pair of left and right half-split rails is adopted, the ring rail can be easily attached to and detached from the elbow.

Furthermore, according to the invention of claim 4, for example, when a right-angled hole for a branch pipe is drilled at a predetermined position of an elbow mounted on a mounting table, a compass provided on the main body of the apparatus is used as a predetermined elbow. This location can be cut into a circle by arranging it near the location and then rotating another torch around.
Thereby, one elbow cutting guide can perform normal cutting along the cutting line of the elbow and, for example, right-angle drilling for a branch pipe.

It is a side view which shows the use state of the elbow cutting guide device which concerns on Example 1 of this invention. It is a top view which shows the use state of the elbow cutting guide device which concerns on Example 1 of this invention. It is an enlarged perspective view of the main part which shows the clamp state of the lower end part of the elbow by the elbow cutting guide device which concerns on Example 1 of this invention. It is an exploded perspective view of the annular rail which constitutes a part of the elbow cutting guide device which concerns on Example 1 of this invention. FIG. 5 is an enlarged perspective view of a main part showing a state during cutting work of an elbow by the elbow cutting guide device according to the first embodiment of the present invention. It is a waist enlarged side view which shows the right-angled hole drilling work state for a branch pipe to one side part of an elbow by the elbow cutting guide device which concerns on Example 2 of this invention.

Hereinafter, examples of the present invention will be specifically described. Here, an elbow cutting guide device used for T-shaped branching of a water supply pipe is taken as an example. For convenience of explanation, the front direction of the guide device is the X1 direction, the rear direction is the X2 direction, the left direction is the Y1 direction, the right direction is the Y2 direction, the upward direction is the Z1 direction, and the downward direction is the Z2 direction.

In FIGS. 1 and 2, 10 is an elbow cutting guide device according to a first embodiment of the present invention, and the elbow cutting guide device 10 includes an apparatus main body 13 in which a mounting portion 12 of a steel elbow 11 is arranged. A pair of front and rear first and second clampers C1 and C2 that clamp the lower end of the elbow 11 to the mounting portion 12, and a pair of upper and lower third and fourth clampers (another clamper) C3 and C4 that clamp the upper end of the elbow 11. The torch 14 for cutting the elbow 11 is arranged on the outer periphery of the torch moving table 15 to be detachably mounted and the elbow 11 clamped to the mounting portion 12, and the torch moving table 15 is placed on the cutting line of the elbow 11. The ring rail 16 for moving along L and the ring rail 16 are detachably attached, and the end face of the ring rail 16 and the end face of the elbow 11 are flush with each other. Is provided with a rail shaft support moving means 17 slidably provided on the device main body 13 in order to vertically rotate the rail 16 and to align the vertical rotation center of the ring rail 16 with the bending center of the elbow 11. It is a rail.

Hereinafter, these components will be specifically described with reference to FIGS. 1 to 5.
As shown in FIGS. 1 to 3, the elbow 11 is a 90 ° elbow having a diameter of 1 m, which is used when the water supply pipe is T-branched.
The device body 13 is a vertical, deformable parallelogram frame. Specifically, it has an upper frame member 18 made of an elongated steel plate, a left frame member 19, a right frame member 20, and a lower frame member 21 on which a mounting portion 12 is arranged, which are adjacent to each other. It is a link structure in which the ends of the frame members 18 to 21 are rotatably connected to each other.

The upper frame member 18 is a member elongated in the X1-X2 direction with the width direction facing up and down, and a pair of bolt holes 18a are formed at both ends in the length direction. Further, a long slide groove 18b is formed in the middle portion of the upper frame member 18 in the width direction over substantially the entire length. Further, a horizontal scale 22 for measuring the horizontal state of the upper frame member 18 is attached to the upper edge of the end portion of the upper frame member 18 on the X1 side.
The left and right frame members 19 and 20 are long members in the Z1-Z2 direction with their lower ends rounded and their widths oriented in the front-rear direction, and a pair of separate bolts on both ends in the length direction. Holes 19a and 20a are formed. At the time of assembling the apparatus main body 13, each bolt hole 18a of the upper frame member 18 and another bolt hole 19a, 20a on the upper side of the corresponding left and right frame members 19, 20 are overlapped, and a short bolt shaft 23 is provided for each. With nuts.

Next, the lower frame member 21 which is long in the X1-X2 direction with the width direction directed to the left and right will be described.
Connecting plate pieces 24 having rounded tip portions are projected on the upper surfaces of both ends of the lower frame member 21 in the length direction. Another bolt hole 24a is formed in each connecting plate piece 24. When assembling the apparatus main body 13, the bolt holes 19a and 20a at the lower ends of the left and right frame members 19 and 20 and the bolt holes 24a of the corresponding connecting plate piece 24 are overlapped with each other, and a short bolt shaft 23 is attached to each. Fasten with nuts.
Further, the lower frame member 21 is formed with a pair of front and rear guide grooves 25 extending in the X1-X2 direction by an equal length from the middle portion in the length direction to the right end portion (see FIG. 3). ..
A pair of short and thick left and right support legs 26 are arranged on the lower surfaces of both ends of the lower frame member 21 in the length direction. Each support leg 26 is pivotally supported by a long left and right screw 29 in which a left-hand thread portion 27 and a right-hand thread portion 28 are butt-connected via a pair of left and right bearings B. The connecting portion between the left-hand thread portion 27 and the right-hand thread portion 28 is arranged on the X2 side from the intermediate portion in the length direction of the left and right screw 29.

This connecting portion is pivotally supported by an intermediate bearing 30 suspended between the guide grooves 25 on the lower surface of the lower frame member 21 (see the partially enlarged view of FIG. 1). Further, the end portion of the left and right screw 29 on the X2 side protrudes outward from the support leg 26 on the right side, and the handle 31 is fixed to this protruding portion.
The mounting portion 12 is a cross frame made of a steel plate, and the central portion thereof is fixed to a portion between the guide grooves 25 via a removable fixing pin 32. When the elbow 11 has a larger diameter, one mounting auxiliary frame 33 made of a steel plate longer than this is placed on the mounting portion 12, or the stability of the elbow 11 at the time of mounting is high. Two may be detachably attached so that a raised cross arrangement can be made (see FIG. 3).

The first clamper C1 has a left nut portion 34 screwed into the left-hand thread portion 27, and the second clamper C2 has a right nut portion 35 screwed into the right-hand thread portion 28. Short clamp columns 36, which are movably inserted in the X1-X2 direction, stand in the left and right nut portions 34 and 35 of the first and second clampers C1 and C2, respectively, in the corresponding front and rear guide grooves 25. It is installed. A pair of short front and rear rotating arms 38 are pivotally supported at the upper end of each clamp column 36 via a pair of horizontal rotating pins 37 extending in the Y1-Y2 direction. A pair of long front and rear Y-shaped arms 40 are pivotally supported at the tip of each rotating arm 38 via a spherical bearing 39. At the tip of each Y-arm 40, a pair of left and right caster-type guide rollers 41 for supporting the lower end of the elbow 11 at four points from the front-rear direction are arranged. The first and second clampers C1 and C2 are composed of these components.
Further, the downward-facing third clamper C3 and the upward-facing fourth clamper C4 have the same structure as the first and second clampers C1 and C2 except that their orientations are different from each other.

As shown in FIGS. 1, 2 and 5, the torch moving table 15 is a rectangular block. The torch moving table 15 is formed with a torch hole 15a that penetrates the central portion of the side surface of X1 and the central portion of the side surface of X2. A torch 14 having a crater 14a at the tip thereof is detachably inserted into the torch hole 15a.
At the center of the lower surface of the torch moving table 15, a guide protrusion having a rounded tip is provided so as to be inserted into a rail groove 42 described later of the annular rail 16.

As shown in FIG. 4, the annular rail 16 is a thick stainless steel donut-shaped plate having an inner diameter larger than the outer diameter of the elbow 11. A rail groove 42 is engraved on the upper surface of the inner peripheral portion of the annular rail 16, and a pair of upper and lower connecting protrusions 43, 44 are formed at the ends on the X1 and X2 sides (upper and lower sides) of the rail groove 42. Are projected respectively. Through holes 45 are formed at the tips of the connecting protrusions 43 and 44 so as to penetrate the upper and lower portions. Further, the annular rail 16 includes a pair of upper and lower connecting protrusions 43 and 44, and has a pair of left and right half-split rails 16A and 16B which are vertically split in half. Each of the connecting protrusions 43 and 44 is divided in half in this way to form a pair of left and right half-split connecting protrusions 43a and 44a each having a half-split through hole 45a.

Next, the rail shaft support moving means 17 will be specifically described with reference to FIGS. 1 and 2.
The rail shaft support moving means 17 is provided in an area of about half of the lower frame member 21 on the X1 side, and has a first slider (lower rail moving table) S1 that can slide in the length direction of the lower frame member 21. , Can slide in the X1-X2 direction integrally with the first slider S1 between the first slider S1 and the upper frame material 18, and can be tilted in parallel and integrally with the left frame material 19 and the right frame material 20. A slide frame member 46 that is long in the Z1-Z2 direction and is hung on the slide frame member 46 and pressed against the upper end (the other end) of the elbow 11, and an upper end portion (the other end) of the elbow 11 provided on the slide frame member 46. A pair of upper and lower clampers C3 and C4 to be clamped, a fifth slider (upper rail moving table) S5 provided on the upper frame member 18 and slidable in the length direction of the upper frame member 18, and a fifth. An upper rail shaft support 48 provided on the slider S5 and vertically rotatably supporting the upper end portion of the annular rail 16 via the upper horizontal shaft 47, and an annular rail 16 provided on the first slider S1. It has a lower rail shaft support portion 50 that vertically rotatably supports the lower end portion of the annular rail 16 via a lower horizontal shaft 49 arranged at the center of vertical rotation.

The first slider S1 is a flat rectangular cylinder long in the X1-X2 direction, and the lower frame member 21 is slidably inserted into the cylinder. A screw hole 52 is formed at the end of the upper plate 51 of the first slider S1 on the X1 side, and the first slider S1 is fixed by pressing the tip portion against the upper surface of the lower frame member 21 into the screw hole 52. The positioning screw 53 to be used is screwed.
A short fixed-side lower frame member 54, which is a lower end of the slide frame member 46, is fixed to the upper plate 51 of the first slider S1 near the center thereof. A long remaining upper portion frame member 56 on the tilting side is vertically rotatably connected to the upper end portion of the lower portion frame member 54 via a horizontal axis pin 55 extending in the Y1-Y2 direction.
Further, between the rear surface (the surface on the X2 side) of the lower part frame member 54 and the upper surface (the surface on the Z1 side) of the upper plate 51 of the first slider S1, the inclination angle of the lower rail shaft support portion 50, and by extension, the inclination angle of the lower rail shaft support portion 50. A protractor 57 for measuring the inclination angle of the annular rail 16 is laid horizontally in an upright state. A lower horizontal shaft 49 of the lower rail shaft support 50 is pivotally supported at the center of the fan of the protractor 57.

The upper end of the slide frame member 46 is connected to a second slider S2 that is slidable to the upper frame member 18.
The second slider S2 is a flat rectangular cylinder long in the Z1-Z2 direction, and the upper frame member 18 is slidably inserted into the cylinder. A horizontal guide pin 58 inserted into the slide groove 18b is laid horizontally in the middle portion of the second slider S2 in the height direction. A screw hole (not shown) is formed in the central portion of the upper plate 59 of the second slider S2. A positioning screw 60 is screwed into this screw hole.
Further, a third slider S3 slidable in the Z1-Z2 direction is arranged above the upper frame member 56. On the other hand, a fourth slider S4 slidable in the Z1-Z2 direction is arranged below the upper frame member 56. The third and fourth sliders S3 and S4 have substantially the same structure as the first and second sliders S1 and S2, which have a positioning screw 61 in a screw hole (not shown).
Of these, the third slider S3 is provided with a downward-facing third clamper C3, and the fourth slider S4 is provided with an upward-facing fourth clamper C4. The upper ends of the elbow 11 are clamped from above and below by the third and fourth clampers C3 and C4.

The upper rail shaft support portion 48 moves up and down to the flange portion 62 via a fifth slider S5 on which a flange portion 62 extending downward is vertically provided and a long hole 62a formed in the flange portion 62 in the Z1-Z2 direction. It has an upper socket 65 having a telescopic structure that can be expanded and contracted, which is composed of two large and small cylinders 63 and 64 that are pivotally supported.
Similar to the first and second sliders S1 and S2, the fifth slider S5 is provided with a screw hole (not shown), a positioning screw 66, and the like.
A bolt hole 63a that can communicate with the elongated hole 62a of the flange portion 62 is formed at the base end portion of the large cylinder 63. Further, a connecting protrusion 43 on the upper side of the annular rail 16 is freely inserted and removed from the tip of the small cylinder 64 of the upper socket 65. At the tip of the small cylinder 64, another through hole 64a is formed which penetrates vertically and can communicate with the through hole 45 of the upper connecting protrusion 43. When the annular rail 16 is mounted, the upper connecting protrusion 43 is inserted into the tip of the small cylinder 64, and in this state, the small bolt 66a is inserted into the through hole 45 and another through hole 64a, and then the nut is fixed. Will be done. On the other hand, the base end portion of the large cylinder 63 of the upper socket 65 is vertically fastened to the flange portion 62 of the fifth slider S5 via the upper horizontal shaft 47, the bolt hole 63a and the elongated hole 62a.

The lower rail shaft support portion 50 has a cylindrical lower socket 67 having a thin base end portion pivotally supported on the lower horizontal shaft 49. A connecting protrusion 44 on the lower side of the annular rail 16 is freely inserted and removed from the tip of the lower socket 67. Further, another through hole 67a is formed at the tip of the lower socket 67 so as to penetrate the upper and lower parts and communicate with the through hole 45 of the lower connecting projection 44. When the annular rail 16 is mounted, the lower connecting protrusion 44 is inserted into the tip of the lower socket 67, and in this state, the small bolt 68 is inserted into the through hole 45 and another through hole 67a, and then the small bolt 68 is inserted. It is bolted.

Next, a method of using the elbow cutting guide 10 according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 5. The first to fifth sliders at ° C. 1 to C5 are slidable by loosening the positioning screws 53, 60, 61, 66, and the slide frame material 46 is the upper and lower partial frames by tightening the horizontal axis pin 55. It is assumed that the materials 54 and 56 are fixed in a straight line.
As shown in FIGS. 1 to 3, when using the elbow cutting guide 10 of the first embodiment, first, a 90 ° elbow 11 is placed on the mounting portion 12 of the apparatus main body 13, and the vertical upper end opening surface thereof is oriented in the X1 direction. Place it toward you. At this time, the central portion of the lower surface of the elbow 11 and the central portion of the cross of the mounting portion 12 are matched with each other.
After that, the handle 31 is rotated in the direction in which the front and rear nut portions 34 and 35 are close to each other, the first and second clampers C1 and C2 are brought close to each other, and the elbow is provided by two pairs of left and right caster type guide rollers 41. The lower end of 11 is clamped from the X1-X2 direction. At this time, the clamp position of the elbow 11 by each caster type guide roller 41 is the vertical rotation of the rotation arm 38 about the horizontal rotation pin 37 and the arbitrary direction of the Y-shaped arm 40 via the spherical bearing 39. It can be changed as appropriate by rotating to.

Next, the pair of upper and lower first and second sliders S1 and S2 are integrally moved in the X2 direction along the corresponding upper and lower frame members 18 and 21, and the surface of the upper partial frame member 56 on the X2 side is elbowed 11. Abuts on the vertical top surface of. In this state, the first and second sliders S1 and S2 are positioned on the upper and lower frame members 18 and 21 by the positioning screws 53 and 60, respectively.
After that, the third and fourth sliders S3 and S4 are brought close to each other along the upper frame member 56, and the upper end portion of the elbow 11 is clamped by the third and fourth clampers C3 and C4 from the Z1-Z2 direction, and in this state. , The third and fourth sliders S3 and S4 are positioned on the upper frame member 56 by the positioning screws 61.

Next, near the cutting line L of the elbow 11, specifically, the torch 14 mounted on the torch moving table 15 is at an angle position facing the cutting line L of the elbow 11, and the left and right half rails 16A and 16B. Are butted against each other to temporarily assemble the annular rail 16 (see FIGS. 4 and 5). After that, the lower connecting protrusion 44 of the annular rail 16 is inserted into the lower socket 67, a small bolt 68 is inserted into the through hole 45 and another through hole 67a, and the small bolt 68 is fastened with a nut. On the other hand, the connecting protrusion 43 on the upper side of the annular rail 16 is inserted into the tip of the small cylinder 64 which is inserted into the large cylinder 63 of the upper socket 65 so as to be retractable. A small bolt 66a is inserted into 64a and fastened with a nut.

In this way, a constant gap appears over the entire circumference of the elbow 11 between the outer peripheral surface of the elbow 11 near the cutting line L and the inner peripheral surface of the annular rail 16, and a circular rail groove 42 is arranged on the upper surface. The ring rail 16 is held in a state of being extrapolated to the elbow 11.
At this time, since the lower horizontal axis 49 is arranged at the bending center of the elbow 11, in this state, the annular rail 16 is held in a posture in which the end surface of the annular rail 16 and the end surface of the elbow 11 are flush with each other. It is in a state of being supported so as to be vertically rotatable around the lower horizontal axis 49.
As a result, in the case of the conventional device, the elbow clamped to the mounting portion must be appropriately moved and tilted so that the center of the cut surface of the elbow coincides with the rotation center of the mounting portion. Compared with the conventional device, the elbow cutting guide device 10 simplifies the cutting preparation work of the elbow 11.

Further, at this time, the fifth slider S5 slidable in the X1-X2 direction along the upper frame member 18 passes through the upper and lower sockets 65 and 67 and the annular rails 16 and the first and second sliders S1 and 2. It moves integrally with S2. Moreover, the annular rail 16 has a lower socket 67 that can rotate vertically around the lower horizontal shaft 49 and an upper side that can move up and down and vertically rotate in the elongated hole 62a via the upper horizontal shaft 47. Using the socket 65, it is vertically rotatable about the lower horizontal axis 49. Further, the small cylinder 64 of the upper socket 65 is inserted into the large cylinder 63 so as to be retractable.
Therefore, regardless of the angle position of the cutting line L on the outer peripheral surface of the elbow 11, the lower connecting protrusion 44 does not hinder the upper connecting protrusion 43 of the annular rail 16 connected to the lower socket 67. It can be connected by inserting it into the small cylinder 64 of the upper socket 65.

The annular rail 16 is not composed of the left and right half-split rails 16A and 16B described above, but may be composed of one annular rail (not shown). In this case, the elbow 11 is first mounted on the mounting portion 12 of the apparatus main body 13, and the lower end portion of the elbow 11 is clamped by the first and second clampers C1 and C2. After that, for example, the rail shaft support moving means 17 is slid along the apparatus main body 13 so that the vertical rotation center of the annular rail 16 coincides with the bending center of the elbow 11. In this state, the torch 14 mounted on the torch moving table 15 holds the annular rail 16 held in a posture in which the end surface of the annular rail 16 and the end surface of the elbow 11 are flush with each other. It may be rotated vertically to an angle position facing the torch.
In such a non-split type annular rail, it is more difficult to connect the connecting protrusions 43 and 44 to the upper and lower sockets 65 and 67 as compared with the half-split type, so that the above-mentioned "cutting" is performed. Regardless of the angle position of the line L on the outer peripheral surface of the elbow 11, the upper connecting protrusion 43 of the annular rail 16 in which the lower connecting protrusion 44 is connected to the lower socket 67 can be connected to the upper socket 65 without any trouble. The structure that can be inserted into the small cylinder 44 of the above is more suitable.

Further, in the case where the elbow 11 is not a 90 ° elbow but a 45 ° elbow (not shown), the device main body 13 and the slide frame member 46, which are parallelogram link structures, are previously connected to the corresponding bolt shaft 23 and the horizontal shaft. The protractors 57 may be bent 45 ° in the X2 direction with the pin 55 as the center, and then the first and second sliders S1 and S2 may be moved in the X2 direction in the same manner. As a result, the surface of the upper frame member 56 inclined by 45 ° on the X2 side can be brought into contact with the inclined upper end surface of the 45 ° elbow. Subsequent operations are substantially the same as in the case of the 90 ° elbow 11.
Since the elbow cutting guide 10 is configured in this way, regardless of the size of the elbow 11 (for example, 90 ° elbow, 45 ° elbow, etc.), the elbow 11 can be cut along the desired cutting line L by a simple operation. It can cut with high precision. Further, the apparatus main body 13 has a parallelogram link structure in which the upper frame member 18, the left frame member 19, the right frame member 20, and the lower frame member 21 with the mounting portion 12 are rotatably connected to each other. Since it is adopted, the elbow cutting guide 10 can be downsized.

Next, as shown in FIGS. 1, 2 and 5, the welder manually attaches the torch moving base 15 to the rail of the ring rail 16 while maintaining the extrapolated state of the ring rail 16 to the elbow 11. It moves along the groove 42 and the torch 14 cuts the elbow 11 along the cutting line L.
In this way, since the elbow 11 is cut by the torch 14 using the annular rail 16 as a ruler, the cut surface of the elbow 11 is less likely to be roughened even when cut by a welder, and finishing work after cutting is unnecessary. Can be. In addition, the cost can be reduced as compared with the conventional device provided with the horizontal movement / elevation mechanism of the mounting portion (mounting table) and the rotation motor of the mounting portion.
The torch moving table 15 may be self-propelled and the elbow 11 may be automatically blown.

Next, the elbow cutting guide device according to the second embodiment of the present invention will be described with reference to FIG.
As shown in FIG. 6, the feature of the elbow cutting guide 10A of the second embodiment is that a right-angled hole for a branch pipe can be drilled on one side (part) of the elbow 11 mounted on the mounting portion 12. A point is that a compass 70 is provided on the upper frame member 56 of the apparatus main body 13 by rotating another torch 14A to cut one side of the elbow 11 in a circular shape.

The compass 70 has a short columnar compass main body 72 having a built-in magnet 71, and a rectangular through hole 73a that is erected at the center of the upper surface of the compass main body 72 and extends in the Z1-Z2 direction at the tip. A compass column 73, an elongated connecting plate 74 movably fitted into the through hole 45, and a rotating shaft 75 extending in the X2 direction vertically rotatably connected to the tip of the connecting plate 74 via a bearing B1. And, the rotary arm 76 whose base end is fixed to the tip of the rotary shaft 75, and the tip of the rotary arm 76 can be moved in the X1-X2 direction according to the separation length from the elbow 11. Has the other torch 14A into which the is fitted.

Next, a case where a right-angled hole for a branch pipe is drilled on one side of the elbow 11 mounted on the mounting portion 12 by using the elbow cutting guide 10A will be described.
First, the compass main body 72 is magnetically attached to the upper frame member 56 near the drilling portion of the elbow 11, and then a circular cutting line drawn on one side of the elbow 11 around the rotation shaft 75 (not shown). Another torch 14A is rotated along the line. As a result, this portion can be cut into a circular shape.
As a result, using only one elbow cutting guide 10A, it is possible to perform normal cutting along the cutting line L of the elbow 11 and right-angle drilling for a branch pipe, respectively.
Since other configurations, actions, and effects are the same as those in the first embodiment, the description thereof will be omitted.

The present invention is useful as a technique for elbow cutting guides used when cutting pipes with a torch.

10,10A Elbow cutting guide 11 Elbow 12 Mounting part 13 Device body 14 Torch 14A Another torch 15 Torch moving table 16 Ring rail 16A, 16B Half rail 17 Rail shaft support moving means 18 Upper frame material 19 Left frame material 20 Right frame material 21 Lower frame material 46 Slide frame material 47 Upper horizontal shaft 48 Upper rail shaft branch 49 Lower horizontal shaft 50 Lower rail shaft branch 70 Compass C1, C2 1st and 2nd clampers (clampers)
C3, C4 3rd and 4th clampers (another clamper)
L Cutting line S1 1st slider (lower rail moving table)
S5 5th slider (upper rail moving table)

Claims (4)

The main body of the device, which has a metal elbow mounting part,
A clamper that clamps one end of the elbow to the above-mentioned placement part,
A torch moving table on which the torch for cutting the elbow is attached in a detachable or fixed state, and
An annular rail arranged on the outer circumference of the elbow clamped to the above-mentioned resting portion and for moving the torch moving table along the cutting line of the elbow.
The annular rail is detachably attached, and the annular rail is supported so as to be vertically rotatable in a posture in which the end surface of the annular rail and the end surface of the elbow are flush with each other, and the annular rail is supported. The elbow cutting guide device is provided with a rail shaft support moving means slidably provided on the main body of the device in order to align the vertical rotation center of the elbow with the bending center of the elbow. The apparatus main body has an upper frame material, a left frame material, a right frame material, and a lower frame material in which the above-mentioned placing portion is arranged, and the adjacent ends thereof can be rotated. With a connected parallelogram frame,
The rail shaft support moving means is
A lower rail moving table provided on the lower frame material and slidable in the length direction of the lower frame material, and
It can be slid integrally with the lower rail moving table between the lower rail moving table and the upper frame material, and can be tilted in parallel and integrally with the left frame material and the right frame material. A slide frame material that is passed and pressed against the other end of the elbow,
With another clamper provided on the slide frame material and clamping the other end of the elbow,
An upper rail moving table provided on the upper frame material and slidable in the length direction of the upper frame material, and
An upper rail shaft support portion provided on the upper rail moving table and vertically rotatably supporting the upper end portion of the annular rail via the upper horizontal shaft.
A lower rail provided on the lower rail moving table and vertically rotatably supporting the lower end of the annular rail via a lower horizontal axis arranged at the center of vertical rotation of the annular rail. The elbow cutting guide according to claim 1, further comprising a shaft branch. The elbow cutting guide according to claim 1 or 2, wherein the annular rail has a pair of left and right half-split rails obtained by vertically dividing the annular rail in half. The device according to any one of claims 1 to 3, wherein the apparatus main body is provided with a compass that rotates another torch to cut a part of the elbow into a circle. Elbow cutting guide.

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