JPH0337816Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is suitable for precision cutting of steel pipes, especially pipe materials with inclined or circular joining surfaces such as curved pipes called deformed steel pipes, camber pipes, shrimp pipes, cheese pipes, etc. This invention relates to a steel pipe cutting device that cuts well and efficiently.

(Prior art) When manufacturing so-called deformed steel pipes such as curved pipes and camber pipes by gas cutting, the conventional method for cutting steel pipes is to develop the pipes to the original size using drawings, as shown in the conventional process flow in Figure 4. After carrying out the process, the pattern is transferred to a paper pattern (gabari), the paper pattern is wrapped around the steel pipe to be cut and marked, and the steel pipe with the marked marks is rotated on a turning roll and the torch is manually moved to perform gas cutting. Ta.

Further, as a conventional cutting device for manufacturing deformed steel pipes, there is a pipe cutting device described in Japanese Patent Publication No. 11504/1983. This cutting device includes a cart that is reciprocally movable on a track and has a turning roll that rotates a tube placed so that its axis is in the longitudinal direction, and a turning roll that rotates the tube that is placed so that its axis is in the longitudinal direction. a guide set and arranged opposite to the end surface of the tube; a guide rod having one end removably attached to the end surface of the tube and the other end abutting the guide; and a guide rod attached to the stationary body and placed on the tube. In a pipe cutting device equipped with a fixed torch for cutting a pipe, the track is arranged so as to be inclined downward in the guide direction, and the guide rod is constantly applied with the force of gravity of the pipe and the truck in the guide direction. This is a tube cutting device that is configured to always apply force in the direction of contacting the guide surface.

(Problems to be solved by the invention) However, these conventional methods have the following drawbacks. First, with the conventional manual gas cutting method, (a) it is necessary to develop the original size and create a paper pattern (gabari) each time the angle of diagonal cutting and the size of the steel pipe change.

(b) Since the cutting is done manually, the accuracy (flatness) of the cut surface is poor, which not only has a negative impact on quality, but also reduces work efficiency.

In addition, the method shown in Japanese Patent Publication No. 53-11504 is
Since the steel pipe is cut by rotating, the cutting surface is affected by the roundness of the steel pipe, and the equipment has to be large-scale.

The device of the present invention eliminates these problems and aims to provide a device that can automatically cut steel pipes without expanding them to their original size.

(Means for Solving the Problems) That is, the gist of the present invention is to provide an apparatus for fixing a steel pipe and cutting the steel pipe, which includes a traveling trolley and an elevator mounted on the traveling trolley so as to be movable up and down via an elevator shaft. A pedestal is provided, and a cutting torch is fixed to the tip of a holding arm attached to a rotating shaft rotated by a motor on the elevating pedestal, and the rotating shaft is configured to be tiltable downward, so that the cutting torch can be moved around the steel pipe. This is a steel pipe cutting device that cuts steel pipes by rotating them.

(Example) Hereinafter, the apparatus of the present invention will be explained in detail with reference to the drawings.

Fig. 1 is a front view of the device according to the present invention;
FIG. 3 is a view taken along the lines A-A and B-B in FIG. 1, respectively.

In the figure, 1 is a steel pipe to be cut, 2 is a pair of turning rolls that support the steel pipe, and 3 is a skid for fixing the turning rolls. 4 is a gas cutting torch, which is fixed to a holding arm 16 attached to the tip of the rotating shaft 5.

6 is an oxygen/acetylene hose for cutting gas.

7 is a running trolley, and on top of the trolley there is an elevating pedestal 15.
is arranged so as to be movable up and down by a lift handle 8 via a lift shaft 9. A cutting angle gauge 14 is provided on the lifting pedestal 15, and the rotating shaft 5 is provided so as to be parallel to a pointer that rotates around the center of the cutting angle gauge 14 as a fulcrum.

Reference numeral 10 denotes a speed reducer, which reduces the rotation of the rotary shaft 5 to an appropriate cutting speed after the power from the motor 11 is adjusted by the current controller 12. Reference numeral 13 denotes a cutting angle adjustment handle for changing the angle of the rotary shaft 5. The center of the cutting angle gauge 14 is used as a fulcrum, and a support plate 17 that supports the motor 11 is connected to a reducer 10 that supports the rotary shaft 5 and a current controller. provided at the end of the The angle of the rotating shaft 5 can be set freely by turning the angle adjustment handle, but the handle may be operated manually or automatically.

According to the apparatus of the present invention, for example, when it is desired to cut a steel pipe 1 at an angle of .theta., as shown in FIG.

Fig. 5 shows the work process flow when using the device of the present invention. This is the process of cutting.

(effect) Next, the operation of the device of the present invention will be explained.

In Figures 1 to 3, a steel pipe 1 carried by a crane (not shown) is placed on a turning roll 2 and the turning roll is rotated several times to set the steel pipe horizontally.

Next, the cutting torch 4 is adjusted to be approximately 10 mm away from the inner surface of the steel pipe 1, and the rotating shaft 5 is inserted into the steel pipe to be cut. After insertion, in order to cut at a predetermined angle, the angle is set by moving the cutting angle adjustment handle 13 up and down and using the cutting angle gauge 14. Next, the position of the lifting pedestal 15 is adjusted by raising and lowering it using the lifting handle 8 so that the tip of the rotating shaft 5 is aligned with the axis of the steel pipe 1. Thereafter, the rotational speed of the cutting torch 4 is set and adjusted based on a predetermined cutting speed table based on the wall thickness of the steel pipe. The setting method is to connect the 200 volt power supply and the current controller 12, and the current adjusted by the current controller 12 to the motor 11.
The rotational speed of the motor is transmitted to the reducer 10.

Further, the output shaft of the reducer 10 transmits the necessary rotation to the rotating shaft 5. After setting the cutting rotation speed, the next step is to set the cutting position of the steel pipe 1. Since the position at which cutting is to be started is previously marked on the steel pipe 1, the cutting torch 4 is brought to that position by moving the traveling carriage 7.

With the above steps, preparations for cutting the steel pipe are completed, and then the rotary shaft 5 is automatically rotated in the usual manner to cut the steel pipe.

Note that the cutting torch 4 is always pressed against the surface of the tube by the spring force of a copying device having rolls (not shown), so that it is kept at a constant distance from the surface of the tube. In the examples shown in FIGS. 1 to 3, the case where the pipe is cut from the inner surface is shown, but in the case of a small-diameter steel pipe, there is no problem even if the pipe is cut from the outer surface in the same manner.

(Effects of the invention) The device of the present invention has the following effects compared to conventional devices.

(a) In the conventional method of cutting steel pipes, it was necessary to develop the steel pipe to its original size, and it was also necessary to copy it to a paper pattern and mark the steel pipe 1, but with this invention, the pipe axis of the steel pipe 1 and the rotation axis 5 were By setting the angle, the above-mentioned conventional steps can be largely omitted, making it possible to work with extremely high efficiency.

(b) With conventional manual cutting, the precision (flatness) of the cut surface was not always good, but with the device of the present invention, the precision of the cut surface is extremely high.

(c) Compared to conventional equipment, it is lighter and can be manufactured more compactly, making it cheaper.

[Brief explanation of drawings]

FIG. 1 is a front view of the apparatus according to the present invention, FIG. 2 and FIG. 3 are views taken along arrows A-A and B-B in FIG. FIG. 5 is a diagram showing the process flow in the device of the present invention. 1... Steel pipe, 2... Turning roll for horizontal adjustment, 3... Skid, 4... Cutting torch, 5...
Rotating shaft, 6...Oxygen/acetylene hose, 7...
Traveling trolley, 8... Lifting handle, 9... Lifting shaft,
10... Speed reducer, 11... Motor, 12... Current controller, 13... Cutting angle adjustment handle, 14... Cutting angle gauge, 15... Lifting base, 16... Holding arm, 17... Support plate.

Claims (1)

[Scope of utility model registration request] A device for fixing a steel pipe and cutting the steel pipe is provided with a traveling carriage and a lifting pedestal mounted on the traveling carriage so as to be movable up and down via a lifting shaft, and a rotating shaft rotated by a motor on the lifting pedestal. A cutting torch is fixed to the tip of a holding arm attached to the steel pipe, the rotating shaft is configured to be tiltable downward, and the cutting torch is configured to rotate around the steel pipe to cut the steel pipe. Steel pipe cutting equipment.