JPS6234464B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pipe cutting machine that cuts a pipe by disposing a torch close to the outer surface of the pipe and moving the torch in the axial direction while rotating the pipe. It is something.

[Conventional technology]

For example, when forming the joint end face of intersecting pipes, it is necessary to move the torch in the axial direction of the pipe while rotating the pipe, and also tilt the torch to cut the bevel along the curve. .

In order to cut such complicated pipes,
Conventionally, pipe cutting machines such as those shown in FIGS. 1 and 2 have generally been used. In both figures, 1 is a cart (not shown) that moves parallel to the axis of the pipe P.
The guide column 2 erected above is a guide member slidably attached to the guide column 1. 4
is a motor attached to a member 3 provided on the upper part of the guide column 1; 5 is a threaded rod driven by the motor 4; 6 is a threaded rod driven by the motor 4;
is a movable member attached to the guide member 2, which is screwed onto the threaded rod 5, and moves up and down along the guide column 1 as the threaded rod 5 rotates. Reference numeral 7 indicates a rotation shaft provided on the movable member 6, and 8 indicates a reversible motor attached to the movable member 6, the output shaft of which is connected to the rotation shaft 7.

Reference numeral 9 denotes a fan-shaped guide having a U-shaped cross section and having stepped portions 10 and 11 at the top and bottom, and a gear 12 is provided on the outer peripheral surface, and one end of the guide is fixed to the rotating shaft 7.
13 is a support plate; 14 is a roller that is attached to the back surface of the support plate 13 and slides on the step portions 10 and 11 of the fan-shaped guide 9; and 15 is a torch that is attached to the support plate 13. 16 is a reversible motor attached to the support plate 13, and its output gear 17 meshes with the gear 12 of the sector guide 9 via an intermediate gear 18. Note that P indicates the pipe to be cut, and O indicates the center of the pipe P.

To cut a pipe using the pipe cutting machine as described above, first, one end of the pipe P is clamped with a chuck (not shown), and the other end is supported by a support roller (not shown). Next, the movable member 6 is moved up and down by the motor 4 and the threaded rod 5, and the torch 15 is brought close to the outer surface of the pipe P and aligned with a point O' on a vertical line passing through the center O of the pipe P. In order to move the torch 15 in the axial direction of the pipe P when cutting the pipe P, it is sufficient to move the cart on which the guide column 1 is erected in parallel to the axis of the pipe P. Further, in order to tilt the torch 15 around a point on the surface of the pipe P in a plane including the diameter of the pipe P, the motor 16 is driven and the support plate 13 is rotated along the fan-shaped guide 9. Furthermore, in order to tilt the torch 15 in the axial direction of the pipe P, it is sufficient to rotate the rotating shaft 7 with the motor 8 and tilt the fan-shaped guide 9. To make the object turn in a conical shape with the top point O' as its apex, the above movements can be combined.

[Problem that the invention seeks to solve]

The pipe cutting machine configured as described above has the following problems, and an early improvement has been desired.

(1) Due to the structure of the fan-shaped guide 9, backlash is likely to occur due to backlash between the support plate 13 and the fan-shaped guide 9 when the torch 15 rotates, which makes it difficult to cut the pipe P accurately.

(2) The structure of the fan-shaped guide 9 is complicated and manufacturing is troublesome.

(3) Due to its structure, dust can easily enter the fan-shaped guide 9.

(4) Since the rotating motor 16 of the torch 15 is provided close to the gas cutting section, it is easily exposed to heat.

(5) When tilting the torch 15 in the axial direction of the pipe P, the fan-shaped guide 9, the motor 16, etc. get in the way, and therefore the tilting range is narrow.

The present invention was made in order to solve the above-mentioned conventional problems, and it is reliable in operation and allows the torch to be tilted over a wide range on a conical surface with the apex at one point on the surface of the pipe. Another object of the present invention is to obtain a pipe cutting machine whose motor is not affected by heat.

[Means for solving problems]

The present invention has been made to achieve the above object, and includes an axial tilting device including an elevating member that has a first rotation axis and is attached to a support that is erected on a cart so as to be able to rise and fall; a tilting member having two rotating shafts and fixed to the first rotating shaft perpendicularly thereto; one end of the tilting member having one end fixed to the second rotating shaft perpendicularly thereto, and two horizontal members on the other side; A planar tilting device including a parallelogram mechanism consisting of a lever connected to one end of each member, and a vertical member connected to the other end of both horizontal members in parallel with the lever; The present invention provides a pipe cutting machine with parallel mounted torches.

[Effect]

To axially tilt the torch, the entire parallelogram mechanism to which the torch is attached is tilted by rotating the first rotating shaft and via a lever fixed thereto. Also, to tilt in a plane that includes the diameter,
The second rotating shaft is rotated to rotate the lever, and the vertical member connected thereto is translated in parallel to tilt the torch.

〔Example〕

FIG. 3 is a front view of an embodiment of the present invention, partially shown in cross section, and FIG. 4 is a sectional view taken along line AA. In addition,
Parts having the same or similar functions as those in FIGS. 1 and 2 are given the same symbols, and explanations thereof will be omitted. 20
21 is a device for tilting the torch 15 in the axial direction of the pipe P (hereinafter referred to as axial tilting device), and 21 is attached to the guide member 2 via an arm (not shown), and a female thread provided on this arm is screwed. It is an elevating member such as a sleeve screwed onto the rod 5. 22 is a rotating shaft inserted into the elevating member 21 via a bearing, and 23 is a reversible motor, which is connected to the rotating shaft 22 via a coupling 24.

30 is a device for tilting the torch 15 in a plane including the diameter of the pipe P (hereinafter referred to as an in-plane tilting device); 31 is a tilting member such as a sleeve fixed to the tip of the rotating shaft 22 orthogonally thereto; 32 is a rotating shaft inserted into the tilting member 31 via a bearing, 33 is a reversible motor, and the rotating shaft 32 and the motor 3
3 are connected via a coupling ring 34.

26 is a lever whose one end is fixed perpendicularly to the tip of the rotating shaft 32; 27 and 28 are horizontal members whose one ends are fixed to the lever 26; and 29 is a horizontal member 2.
The vertical members 7 and 28 are pivoted at the other ends in parallel with the lever 26, and together constitute a parallelogram link mechanism 25. A torch 15 is attached to the vertical member 29 of the parallelogram link mechanism 25 in parallel thereto, and this torch 15 is arranged on a vertical line passing through the center O of the pipe P.

Next, the operation of the pipe cutting machine of the present invention constructed as described above will be explained. First, one end of the pipe P is clamped with a chuck (not shown), and the other end is supported with a support roller (not shown). Next, the axial tilting device 20 is moved up and down by the threaded rod 5, and the rotating shaft 2
2, passing through a point O' on the outer surface of the pipe P, and perpendicular to the vertical line passing through the center O of the pipe P
-Position on the X-ray. At this time, the tip of the torch 15 is located slightly away from the outer surface of the pipe P.

In this state, in order to tilt the torch 15 around a point O' on the outer surface of the pipe P in a plane that includes the diameter of the pipe P, the lever 26 is rotated by the motor 33, and the vertical member 29 is rotated. Lever 26
Displaced in parallel to, for example, the state shown by the dashed-dotted line,
The torch 15 is tilted together with the vertical member 29 about point O'. On the other hand, in order to tilt the torch 15 in the axial direction of the pipe P, the motor 23 is rotated to rotate the tilting member 31 and therefore the lever 26 around the
Tilt in the axial direction while holding at point O'. Therefore, by combining the above two movements while rotating the pipe P and the movement of the cart in the axial direction, the torch 15 can be turned in a conical shape with one point on the surface of the pipe P as its apex. Therefore, the pipe P can be cut at a desired groove.

In the above explanation, a case has been described in which the pipe is cut manually, but in actual work, the pipe can be cut automatically by numerically controlling the pipe cutting machine based on specifications.

〔Effect of the invention〕

As is clear from the above description, the present invention uses a parallelogram link mechanism as a device for tilting the torch in a plane that includes the diameter of the pipe in a pipe cutting machine, so the structure is simple and the operation is reliable. Therefore, there is no risk of rattling during tilting, and the tilting range can be greatly expanded. Furthermore, since the motor is located away from the gas cutting section, there is no risk of it being affected by heat, which has great effects.

[Brief explanation of the drawing]

Figure 1 is a front view of an example of a conventional pipe cutting machine.
FIG. 2 is a longitudinal sectional view of the main part thereof, FIG. 3 is a partially sectional front view of an embodiment of the present invention, and FIG. 4 is a sectional view taken along line AA. 1: Guide post, 2: Guide member, 5: Threaded rod, 15: Torch, 20: Axial tilting device, 2
5: Parallelogram link mechanism, 30: In-plane tilting device.

Claims (1)

[Scope of Claims] 1. A device for cutting the pipe by arranging a torch close to the outer surface of the pipe and moving the torch in the axial direction while rotating the pipe, the apparatus having a first rotating shaft and mounted on a cart. an axial tilting device equipped with an elevating member mounted on an erected column so as to be able to rise and fall; a tilting member having a second rotating shaft and fixed to the first rotating shaft orthogonally thereto; and one end thereof. is the second
A lever fixed perpendicularly to the rotational axis of the lever and having one end of two horizontal members connected to the other side, and a vertical member connected to the other ends of both horizontal members in parallel with the lever. A pipe cutting machine comprising: a plane tilting device having a parallelogram mechanism; and a torch attached to the vertical member in parallel thereto.