JP3274116B2 - Pipe screw processing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thread processing device for engraving a screw on a pipe wall.

[0002]

2. Description of the Related Art A conventional pipe screw machining apparatus fixes a cutting blade for cutting a wall of a pipe, advances the pipe at a predetermined pitch while rotating the pipe itself while cutting the wall of the pipe into the cutting blade. Alternatively, since a continuous spiral screw is engraved on the wall of the pipe by being retracted, the following problem arises.

In the case of threading a large-diameter pipe,
It is necessary to deploy a large lathe with a large through hole in the spindle,
It is uneconomic. When the long pipe is moved forward or backward while rotating, a blur occurs and a partial distortion occurs in the screw. In the conventional method of rotating a pipe, it is almost impossible to cut a screw (male screw) on the outer wall of the pipe. It is impossible to thread a large-diameter long pipe at a work site without facilities such as a large lathe.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the problems described in the prior art.
It is an object of the present invention to provide a pipe threading device capable of easily threading even a large-diameter long pipe.

[0005]

According to a pipe screw machining apparatus of the present invention, a cutting blade for cutting a fixed pipe wall while rotating revolves around the axis of the pipe.
It is characterized in that there is provided a mechanism for engraving a spirally continuous screw on the wall of the pipe by moving the pipe parallel to the axis of the pipe with a predetermined pitch.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. In FIGS. 1 to 3, reference numeral 1 denotes a pipe made of metal or plastic.
Is fixed to the body frame 4 by the holder 5,
The upper part is supported by an inner wall support guide 6 or an outer wall support guide 7 as shown in FIG.

Reference numeral 2 denotes a cutting blade. The shape of the cutting edge differs depending on the shape of the screw 3 to be engraved. In this example, the cutting blade 2 used when cutting a square screw is shown.

The cutting blade 2 is fixed to the tip of a cutting blade shaft 8,
A cutting blade shaft gear 9 is fixed to the rear end of the cutting blade shaft 8.

The cutting blade shaft gear 9 meshes with a driven gear 10, and the driven gear 10 meshes with a main shaft gear 12 fixed to the tip of a main shaft 11.

A pulley 13 is fixed to an upper portion of the main shaft 11, and the pulley 13 is connected to a main shaft drive motor 15 via a belt 14.

Therefore, when the main shaft drive motor 15 is driven, the main shaft 11 rotates, and in conjunction therewith, the main shaft gear 12 rotates, and the driven gear 10 meshing with the main shaft gear 12 rotates, and the driven gear 10 rotates. The cutting blade shaft gear 9 meshing with the gear 10 rotates, the cutting blade shaft 8 rotates at the same time, and the cutting blade 2 fixed to the cutting blade shaft 8 can rotate. Since the cutting blade 2 itself is rotating,
Here, the rotation of the cutting blade 2 is called.

The cutting blade shaft 8 and the driven gear 10 are rotatably supported at predetermined positions in a gear box 16.
1 is rotatably supported at the center of the gear box 16. Therefore, when the gear box 16 rotates, the main shaft 11 remains as it is, but the cutting blade shaft 8 and the driven gear 10
Rotates around the main shaft 11. The center axis of the main shaft 11 and the axis L of the pipe 1 are designed to coincide with each other. That is, since the cutting blade 2 is fixed to the cutting shaft 8, when the gear box 16 rotates, the cutting blade 2 rotates about the axis L of the pipe 1.
However, it revolves around the axis L of the pipe 1.

The spindle 11 is a spindle cylinder 1 supported by a frame.
7, screws 18 are engraved on the lower outer wall of the main shaft cylinder 17 at the same pitch as the pitch of the screws 3.

A guide bush 19 in which a screw screwed to the screw 18 of the main shaft cylinder 17 is engraved on an inner wall portion is provided.
Screw 18.

A guide bush driving gear 20 is fixed to the upper end of the guide bush 19. Therefore, when the guide bush driving gear 20 is rotated, the guide bush 19 is screwed into the screw 18 of the main barrel 17 while the main bush 1 is rotated.
7 can be moved up and down at the same pitch as the screw 18.

A cylindrical support 21 having a flange at the lower end is fixed to the guide bush 19 by a bolt or the like.

The upper surface of the gear box 16 is fixed to the flange of the support fitting 21 with bolts or the like. Therefore, when the guide bush 19 rotates, the support fitting 21 rotates, and in conjunction therewith, the gear box 16
Is designed to rotate.

The guide bush drive gear 20 meshes with a spur gear 22 having flanges on both sides. The spur gear 22 is mounted on the spline shaft 23 so as to be vertically movable.

A spline shaft gear 24 is fixed to the upper end of the spline shaft 23.
Reference numeral 4 meshes with a drive gear 26 fixed to the shaft of a spline shaft drive motor 25.

In FIG. 1, the guide bush 1 is driven in a state where the spindle drive motor 15 is driven and the cutting blade 2 is rotated.
9 moves in the direction in which the spline shaft drive motor 2 moves downward.
5, the guide bush 19 moves downward while rotating at the same pitch as the screw 18 of the main barrel 17, and in conjunction therewith, the gear box 16 also rotates downward at the same pitch as the screw 18 of the main barrel 17. Go to

Therefore, the rotating cutting blade 2 revolves around the axis L of the pipe 1 at the same pitch as the screw 18 of the main barrel 17 and moves downward in parallel with the axis L of the pipe 1. Cut the wall of the pipe 1 and use a screw 3 as shown in FIG.
Is engraved on the inner wall or the outer wall of the pipe 1.

When the predetermined thread cutting is completed, the spindle drive motor 15 is turned off, the rotation of the cutting blade 2 is stopped, the spline shaft drive motor 25 is rotated in the reverse direction, and the cutting blade 2 is moved along the screw 3. , While moving in the opposite direction, it is moved upward to escape from the pipe 1.

In this embodiment, an example of engraving a square screw has been described. However, screws of various shapes can be engraved by replacing the cutting blade 2.

Also, in the case of a long pipe, the vertical posture shown in FIG. 1 can be used in a horizontal posture by inclining it 90 degrees to the right and using it in a horizontal posture. .

[0025]

Since the present invention is configured as described above, it has the following effects. Since the pipe is fixed, the size of the apparatus can be reduced. Since the pipe is fixed, the conventional blurring does not occur, so that a desired screw without distortion can be carved. A screw (male screw) can be cut on the outer wall of the pipe. Since it is small, it is easy to carry it into the work site, and it is possible to thread large-diameter long pipes on site.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view showing one embodiment of the present invention.

FIG. 2 is a side view showing an example of an outer wall support guide that supports an outer wall portion of a pipe.

FIG. 3 is an explanatory view showing a state of an engraved screw;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipe 2 Cutting blade 3 Screw 4 Main frame 5 Holder 6 Inner wall support guide 7 Outer wall support guide 8 Cutting blade shaft 9 Gear for cutting blade shaft 10 Follower gear 11 Main shaft 12 Gear for main shaft 13 Pulley 14 Belt 15 Main shaft Drive motor 16 Gear box 17 Main shaft cylinder 18 Main shaft cylinder screw 19 Guide bush 20 Guide bush drive gear 21 Support bracket 22 Spur gear with flange on both sides 23 Spline shaft 24 Spline shaft gear 25 Spline shaft drive motor 26 Drive gear L Pipe shaft

Claims (1)

(57) [Claims] A cutting blade (2) is fixed to the tip of a cutting blade shaft (8), and a gear (9) for a cutting blade shaft is provided at a rear end of the cutting blade shaft (8).
And the cutting blade shaft gear (9) is driven by a driven gear (10).
, And the driven gear (10) is designed such that the center axis coincides with the axis (L) of the pipe (1).
A pulley (13) meshed with a spindle gear (12) fixed to the tip of (1) and fixed on the upper part of the spindle (11).
Is coupled to a main shaft drive motor (15) via a belt (14), and the cutting blade shaft (8) and the driven gear (10) are rotated to predetermined positions in a gear box (16). The main shaft (11) is housed in a main shaft tube (17) supported by a frame, and is mounted on a lower outer wall portion of the main shaft tube (17).
Screw (1) at the same pitch as screw (3) to be cut
8), and a guide bush (19) in which a screw to be screwed into the screw (18) of the main shaft tube (17) is screwed to the screw (18) of the main shaft tube (17). A tubular support fitting (21) having a guide bush gear (20) fixed to the upper end of the guide bush (19) and a flange provided at the lower end.
And the flange portion of the support metal fitting (21) is fixed to the upper surface of the gear box (16).
2), the spur gear (22) is vertically movably mounted on the spline shaft (23), and the spline shaft (2)
Fix the spline shaft gear (24) to the upper end of 3),
The spline shaft gear (24) is connected to a spline shaft drive mode.
Pipe screw machining device engaged with a drive gear (26) fixed to a shaft of a screw (25).