JPH0445285B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a tube cutting machine particularly suitable for use with large diameter tubes.

<Conventional technology> As a conventional pipe cutting machine, for example,
There are some such as those shown in Publication No. 36295 and Japanese Patent Publication No. 53-22712. This tube cutting machine is of a push-cutting type in which a plurality of disc-shaped cutting blades rotate in a roller manner and cut the outer circumferential surface of a tube by gradually tightening the tube.

<Problems to be Solved by the Invention> However, in such conventional push-cut type pipe cutting machines, the "pushing amount" of the cutting blade, that is, the amount of approach and separation of the cutting blade from the outer circumferential surface of the pipe, is This depends on how much the screw is pushed in, and since the screw was pushed in manually, pushing the cutting blade in too quickly could cause burrs on the cut surface.
During plumbing work where a pipe is cut and then connected to another pipe, if a burr is created on the cut surface as described above,
It took a lot of effort to deburr this cut surface, so we developed a pipe cutting machine that does not create burrs on the cut surface by mechanically adjusting the amount of approach and separation of the cutting blades without relying on input. It was wanted.

<Means for Solving the Problems> In order to achieve the above object, the pipe cutting machine according to the present invention mounts and fixes a guide flange at a predetermined position on the pipe so as to surround the outer peripheral surface of the pipe. The main body is self-propelled and rotated on the outer circumferential surface of the pipe via a drive part that meshes with a drive chain wound around the pipe, and the cutting blade of the cutting blade holder provided on the main body In a pipe cutting machine that cuts pipes in the circumferential direction, the main body has a cutting blade feeding motor that rotates according to the amount of free movement and rotation of the main body, and a cutting blade feeding motor that moves forward and backward. A slider that can be pressed,
A cutting blade feeding device is attached which includes at least a sensor that detects the amount of forward and backward movement of the slider and feeds back the detected amount to the cutting blade feeding motor, and the cutting blade holder section detects the amount of forward and backward movement of the slider and feeds the detected amount back to the cutting blade feeding motor. The gist is that it is supported by a slider in order to maintain the amount of proximity and separation from the surface.

<Function> The main body runs and rotates on the outer circumferential surface of the pipe through a drive part that meshes with a drive chain wound around the pipe and along a guide flange that is mounted and fixed at a predetermined position on the pipe. detects the cutting blade feeding motor that rotates according to the self-propelled and rotational amount of the main body, the slider that is moved forward and backward by this cutting blade feeding motor, and the amount of forward and backward movement of this slider, and calculates the detected amount. A cutting blade feeding device including at least a sensor that provides feedback to the cutting blade feeding motor is attached,
The cutting blade holder section is supported by the slider so that the amount of movement of the slider toward and away from the outer peripheral surface of the tube is the amount of movement of the slider toward and away from the outer peripheral surface of the tube. The amount of approach and separation from the outer circumferential surface of the pipe is the amount of cutting by the cutting blade.On the other hand, the amount of forward and backward movement of the slider is constantly detected by a sensor, and this is fed back to the motor for feeding the cutting blade, so the cutting amount applied to the cutting blade holder. The amount of approach and separation can be made uniform, and the cutting amount of the cutting blade can be finely adjusted automatically.

<Example> The present invention will be described below based on the drawings. 1st
4 to 4 are diagrams showing an embodiment of the present invention. Reference numeral 1 denotes a main body of a tube cutting machine, and this main body 1 is mainly composed of a drive section 2, a cutting blade feeding device 3, and a cutting blade holder section 4. A guide flange 6 is mounted and fixed at a predetermined position on the pipe 5 to be cut so as to surround the outer circumferential surface 5a of the pipe 5, and a driving chain 7 is attached to the pipe 5 so as to be wound thereon.

The drive section 2 mainly includes a drive motor 8, a total of four rollers 10 with sprockets 9, a chain tension guide 11, and a pair of guide rollers 12 for contacting the flange 6. The sprocket 9 is rotated in the forward or reverse direction by the rotation of the drive motor 8, and meshes with the chain 7 wound around the tube 5. The main body 1 is self-propelled and rotates on the outer peripheral surface 5a of the tube 5. The chain tension guide 11 is for adjusting the tension of the chain 7.
By adjusting the tension adjuster 13 with a connected push screw, it is possible to press the chain 7 side or
The tension of the chain 7 is adjusted by moving back from the side. The guide rollers 12 are a pair of rollers that sandwich the guide flange 6, and by coming into contact with the guide flange 6 from the left and right sides, the entire body 1 is positioned at a predetermined position in the longitudinal direction of the pipe 5, and the sprocket The entire main body 1 is connected to the pipe 5 via the drive section 2 using the chain 7 and
When moving in the circumferential direction (direction of arrow A), this guide roller 12 causes the main body 1 to move and rotate along the guide flange 6.

The cutting blade feeding device 3 mainly includes a cutting blade feeding motor 1.
4, gear 15, feed screw 16 and slider 17
It consists of The cutting blade feed motor 14 is connected to the drive motor 8 via a circuit (not shown).
Depending on the amount of rotation of the drive motor 8, that is, the amount of free movement and rotation of the main body 1, move the slider 17 by a fraction of a millimeter.
It is designed to be controlled as follows. The rotation of the cutting blade feed motor 14 is transmitted to the feed screw 16 via a gear 15, and the rotation of the feed screw 16 is converted into forward or reverse rotation. The slider 17 is integrally provided with a threaded portion 18 that threads into the feed screw 16.
The feed screw 1 is rotated by rotating in the forward or reverse direction.
6 (in the direction of arrow B in FIG. 4), and is normally pressed against the base point 17a by the biasing force of a spring 22. Base point 1
7a defines the position where the cutting blade 23 of the cutting blade holder part 4, which will be described later, comes into contact with the pipe 5, and the slider 1
7 is located at the base point 17a, the cutting edge 23
It is shown that it is in contact with the outer circumferential surface 5a of the tube 5. The slider 17 is equipped with a sensor 19 that can detect "distance", and by measuring the distance between the base point 17a and the slider 17, the "advance/retreat amount" of the slider 17 can be detected. Further, one end 20a of a first arm 20 is pivotally supported on this slider 17, and the other end of this first arm 20 is supported by the slider 17.
It is pivotally supported at a fulcrum X so that it can rotate as indicated by the arrow α in FIG. This first arm 2
0 through an auxiliary arm 20p. The second arm 21 connects the first arm 20 and the cutting blade holder part 4, and the rotation of the first arm 20 is the fourth
This is converted into a vertical movement as indicated by the arrow β in the figure, that is, a movement in a direction perpendicular to the tube 5, and is transmitted to the cutting blade holder portion 4. That is, the rotation of the cutting blade feeding motor 14 is from the cutting blade feeding motor 14 to the gear 15.
→Feed screw 16→Threaded part 18→Slider 17→
The transmission is from the first arm 20 to the second arm 21 to the cutting blade holder section 4 to the cutting blade 23, and after the rotation of the cutting blade feed motor 14 is converted to the forward and backward movement of the slider 17, the rotation of the pipe 5 is transmitted. This is further converted into the "approach/separation amount" of the cutting blade holder portion 4 with respect to the outer circumferential surface 5a. At this time, the amount of forward and backward movement of the slider 17 is detected by the sensor 19, and this detected amount is transmitted to the cutting blade feeding motor 14 via the feedback system 30.
Because of the feedback, the amount of forward/backward movement of the slider 17 can be adjusted accurately and reliably even if the forward/backward movement is minute in units of a few tenths of a millimeter.

The cutting blade holder part 4 mainly includes a holder part 24 connected to the second arm 21, a cutting blade 23 supported by the holder part 24, and a replacement instruction sensor 25 for the cutting blade 23. The cutting blade 23 is the holder part 2
4, and is in contact with the outer circumferential surface 5a of the tube 5, and is supplied with rotational driving force (air) for cutting via an air hose 31 from an air driving source (not shown).
I have made it possible for you to receive it. Since the distance of the cutting blade 23 from the guide flange 6 is determined in advance,
By guiding the main body 1 with the guide flange 6 via the guide roller 12, the cutting blade 23 is positioned at a predetermined cutting location. The cutting blade 23 in contact with the outer circumferential surface 5a of the tube 5 approaches and moves away from the outer circumferential surface 5a as the slider 17 moves forward and backward, thereby cutting the tube 5. That is, the forward and backward movement of the slider 17 transmitted from the slider 17 to the first arm 20 to the second arm 21 to the cutting blade holder section 4 ultimately causes the cutting blade 23 supported by the cutting blade holder section 4 to cut the pipe 5. It is a quantity. A major feature of the present invention is that the cutting blade feeding device 3 equipped with the sensor 19 is used to adjust the amount of approach and separation of the cutting blade holder portion 4 from the outer circumferential surface 5a, that is, the cutting amount of the cutting blade 23.

The replacement instruction sensor 25 is a sensor that monitors the vicinity of the tip of the cutting blade 23, and when the cutting blade 23 is worn out, it issues a signal via the system 26 to stop the main body 1, or issues a warning to notify the operator. This prompts the cutting blade 23 to be replaced at any time, and a photoelectric switch can be used. Also 27
is a display indicating the reverse rotation instruction position, and the outer peripheral surface 5 of the tube 5
When the main body 1 moves on the surface a to cut, a signal is given to the drive motor 8 to direct the forward direction or the reverse direction at this reverse direction instruction position 27. Reference numeral 28 indicates an overload switch, and reference numeral 29 indicates a torque tender. When an excessive load is applied to the main body 1 during operation, a signal is sent to the overload switch 28 connected by the torque tender 29 to turn off the power (not shown) to the main body. This is for stopping 1.

By the way, 32 is a sensor for stopping, and the "cutting surface"
That is, in order to detect the outer circumferential surface 5a of the tube 5, the cutting blade 2
3 and connected to the drive motor 8. A proximity switch is adopted as this sensor 32, and when the cutting blade 23 bites into the pipe 5 and cuts it, detecting the distance between the sensor 32 and the outer circumferential surface 5a and reaching a set amount, the sensor 32 outputs a circuit (not shown). A signal is sent through the drive motor 8 to stop the power supply of the drive motor 8 and the power supply of a drive source (not shown) that applies rotational force to the cutting blade 23.

Next, the effect will be explained.

Attachment of the main body 1: With the guide rollers 12 in contact from the left and right with the guide flange 6 mounted and fixed at a predetermined position on the pipe 5, the sprocket 9 is meshed with a separate chain 7, and the entire main body 1 is assembled. is attached to the outer circumferential surface 5a of the tube 5.

Movement of the main body 1: When the sprocket 9 is rotated in the forward direction by the rotation of the drive motor 8, the sprocket 9 moves against the chain 7.
By engaging and rotating the main body 1 along the guide flange 6 in the circumferential direction of the tube 5 [direction of arrow A]
This will allow it to move and rotate on its own. At this time, tube 5
The main body 1 is smoothly moved by the rollers 10 that come into contact with the outer circumferential surface 5a of the main body 1.

Biting and cutting of the cutting blade 23 against the outer circumferential surface; When the predetermined self-propelling and rotation amount of the main body 1 is achieved, the next cutting amount is instructed to the cutting blade feeding motor 14 via a circuit (not shown). Cutting blade feed motor 14→
The rotation of the cutting blade feeding motor 14 is transmitted as follows: gear 15 → feed screw 16 → threaded part 18 → slider 17 → first arm 20 → second arm 21 → cutting blade holder part 4 → cutting blade 23. After being converted into the amount of forward and backward movement, it is further converted into the amount of proximity of the cutting blade holder portion 4, and this amount of proximity of the cutting blade holder portion 4 becomes the cutting amount applied to the cutting blade 23.

Setting the amount of rotation/movement of the main body 1 and the cutting amount of the cutting blade 23; The drive motor 8 that rotates the main body 1 automatically sends the cutting blade by using the amount of rotation (rotation speed) as a signal via a circuit not shown. The cutting amount of the cutting blade 23 is set and instructed according to the amount of rotation.

Biting of the cutting blade 23 into the outer circumferential surface 5a; When the cutting blade feeding motor 14 receives a signal of the cutting amount according to the rotation amount of the drive motor 8, the cutting blade feeding motor 14→gear 15→feed screw 16→screw Joint part 1
8 → slider 17 → first arm 20 → second arm 21 → cutting blade holder section 4 → cutting blade 23,
The "rotation amount" is converted into the "advance/backward movement amount" of the slider 17, the "approach/separation amount" of the cutting blade holder 4, and finally the "cutting amount" of the cutting blade 23 according to the rotation amount of the drive motor 8. This causes the cutting blade 23 to bite into the pipe 5. At this time, the sensor 19 provided on the slider 17 accurately and reliably detects the forward and backward movement of the slider 17 even if it is a minute amount of a few tenths of a millimeter, and feeds back this detected amount to the cutting blade feed motor 14. The "approach/separation amount" of the cutting blade holder portion 4 can be controlled, and the cutting amount of the cutting blade 23 can also be minutely adjusted automatically.

Stopping cutting; When the cutting blade 23 has finished cutting the pipe 5 or is about to finish cutting, the sensor 32 that has been detecting the distance to the outer circumferential surface 5a of the pipe 5 during cutting detects that the distance has reached a set amount. The cutting blade 2 is detected at the same time.
3, the driving of the drive motor 8, and the free movement and rotation of the main body 1 are also stopped.

<Effects> Since the pipe cutting machine according to the present invention has the content as explained above, the signal sent to the cutting blade feeding motor according to the amount of self-propelled movement and rotation of the main body is controlled by the amount of forward/backward movement of the slider and the cutting blade. This is converted into the amount of approach and separation of the holder part, which ultimately controls the cutting amount of the cutting blade, and furthermore, the amount of cutting into the tube is fed back to the cutting blade feed motor again, so it is automatic. The cutting amount can be adjusted in a precise manner, the cutting amount can be finely adjusted by a sensor provided on the slider, and a clean cut surface without burrs can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view showing a tube cutting machine according to the present invention, FIG. 2 is a side view seen from the direction of the arrow in FIG. 1, and FIG. 3 is a cutting blade of the tube cutting machine according to the present invention. A schematic side view of the feeding device portion, and FIG. 4 is a schematic side view of the cutting blade feeding device portion viewed from the direction of the arrow in FIG. 3. DESCRIPTION OF SYMBOLS 1... Main body, 2... Drive part, 3... Cutting blade feeding device, 4... Cutting blade holder part, 5... Pipe, 5a...
Outer peripheral surface, 6... Guide flange, 7... Chain, 14... Cutting blade feed motor, 17... Slider, 19... Sensor, 23... Cutting blade, A... Circumferential direction.

Claims (1)

[Scope of Claims] 1. A drive unit in which a guide flange is mounted and fixed at a predetermined position on the pipe so as to surround the outer peripheral surface of the pipe, and meshes with a drive chain that runs along the guide flange and is wound around the pipe. In the pipe cutting machine, the main body is self-propelled and rotates on the outer peripheral surface of the pipe via the main body, and the pipe is cut in the circumferential direction with the cutting blade of the cutting blade holder provided in the main body. , a cutting blade feed motor whose rotation speed is set according to the amount of free movement and rotation of the main body, a slider that is moved forward and backward by this cutting blade feed motor, and the amount of forward and backward movement of this slider is detected. A cutting blade feeding device including at least a sensor that feeds back a detected amount to the cutting blade feeding motor is attached, and the cutting blade holder portion adjusts the outer periphery of the cutting blade tube with respect to the slider according to the amount of forward and backward movement of the slider. A pipe cutting machine characterized by being connected in such a way that the amount of approach and separation from a surface is determined.