JPS61209816A - Pipe cutting machine - Google Patents

Abstract

PURPOSE:To obtain a clean cut surface without burrs by converting a signal to a cutting edge feed motor corresponding to the quantity of rotation by self- travel of a body, into the quantity of travel of a slider and the quantity of closeness of a cutting edge holder part. CONSTITUTION:A chain 7 is rotated via a sprocket 9 by rotating a driving motor 8 to make a body 1 self-travel around a pipe 5 along a guide flange 6. The signal of the quantity of rotation of the motor 8 is sent to a cutting edge feed motor 14, the rotation of which is converted into the quantity of travel of a slider 17 and, then, further into the quantity of closeness of a cutting edge holder part 4. Accordingly, the quantity of rotation of the driving motor 8 is converted into the cutting quantity of the cutting edge 23, while returning the quantity of travel of the slider 17 detected by a sensor 19 to the cutting edge feed motor 14, to carry out cutting into a pipe 5. Thus, the quantity of cutting can be minutely adjusted, to obtain a clean cut surface without burrs.

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.

<Prior art> As a conventional pipe cutting machine, for example, the Japanese Utility Model Publication No. 50-36295
There are some such as those shown in Japanese Patent Publication No. 53-22712. This tube cutting machine is of a push-cut type in which a plurality of disc-shaped cutting blades rotate in a roller manner to cut the outer peripheral surface of the tube while 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 well the pipe is pushed in, and the screws were pushed in manually by humans, so pushing the cutting blade too quickly may cause cracks on the cut surface, making it difficult to connect another pipe after cutting it. When performing piping work, if a gap is created on the cut surface as described above,
It took a lot of effort to remove burrs from the cut surface, so a pipe cutting machine was developed that could prevent burrs from forming on the cut surface by mechanically adjusting the amount of approach and separation of the cutting blades without manual effort. It was wanted.

Means for Solving 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 of the pipe to surround the outer peripheral surface of the pipe, and The main body moves and rotates on the outer circumferential surface of the pipe through a drive part that meshes with a drive chain that runs along the flange and is wound around the pipe. In a pipe cutting machine that cuts a pipe 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 cutting blade feeding device is attached, which includes at least a slider that moves forward and backward, and 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. The gist is that the tube is supported by a slider so as to be close to and away from the outer circumferential surface of the tube.

Function: A main body that runs and rotates on the outer circumferential surface of the pipe via a drive unit that meshes with a drive chain that is wound around the pipe and along a guide flange that is mounted and fixed at a predetermined position on the pipe. In this method, a cutting blade feeding motor rotates according to the amount of free movement and rotation of the main body, a slider is moved forward and backward by this cutting blade feeding motor, and the amount of forward and backward movement of this slider is detected, and the detected amount is calculated as described above. A cutting blade feeding device is attached that includes at least a sensor that feeds back to the cutting blade feeding motor, and the cutting blade holder portion supports the slider to determine the amount of forward and backward movement of the slider as the amount of approach and separation from the λ circumferential surface of the tube. Therefore, the amount of self-propulsion and rotation of the main body - the amount of forward and backward movement of the slider -
The amount of approach and separation of the cutting blade holder from the outer circumferential surface of the tube - 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 cutting blade feed motor, so the cutting It is possible to equalize the amount of approach and separation applied to the blade holder part, and to automatically adjust the amount of cutting by the cutting blade.

Embodiments The present invention will be explained below based on the drawings. Figures 1 to 4
The figure shows an embodiment of the present invention.

1 is the main body of the 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. The pipe 5 to be cut has a guide flange 6 at a predetermined position.
is mounted and fixed so as to surround the outer peripheral surface 5a of the tube 5, and a driving chain 7 is wound around the tube 5 and attached thereto.

The drive unit 2 mainly includes a drive motor 8, a total of four rollers 10 with sprockets 9, and a chain tension guide 11.
and a pair of guide rollers 12 for contacting the flange 6. The sprocket 9 rotates 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.
By this rotation, the main body 1 moves and rotates on the outer circumferential surface 5a of the tube 5 via the four-wheeled rollers 10. The chain tension guide 11 is used to adjust the "tension" of the chain 7, and the chain tension guide 11 is used to adjust the "tension" of the chain 7, and the chain tension guide 11 is used to adjust the tension of the chain 7 by adjusting the tension adjuster 13 with a push screw. This is used to adjust the tension of the chain 7. 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 main body 1 is positioned at a predetermined position in the longitudinal direction of the pipe 5.
Then, the entire main body 1 is moved in the circumferential direction of the tube 5 [in the direction of arrow A] via the drive unit 2 using the sprocket 9 and the chain 7.
When moving, the guide rollers 12 allow 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 14 and a gear 1.
5. Consists of a feed screw 16 and a slider 17.

The cutting blade feeding motor 14 is connected to the drive motor 8 through a circuit (not shown), and advances the slider 17 according to the amount of rotation of the drive motor 8, that is, the amount of free movement and rotation of the main body 1. It is designed to be controlled in such a way. 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 part 18 that is threaded into the feed screw 16, and when the feed screw 16 rotates in the forward or reverse direction, the slider 17 is rotated in the longitudinal direction of the feed screw 16 [in the direction of arrow B in FIG. ]
The spring 22 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 17 is located at the base point 17.
When the cutting edge 23 is located at the outer peripheral surface 5a of the pipe 5,
This indicates that the device is in contact with the device. This slider 17 is equipped with a sensor 19 that can detect the "distance", and by measuring the distance between the base point 17a and the slider 17, the "advance/retreat movement" of the slider 17 can be detected. One end 20a of a first arm 20 is pivotally supported on this slider 17.
The other end of the arm 20 is pivotally supported at a fulcrum X so as to rotate as the slider 17 moves back and forth. This first arm 20
The second arm 21 is connected in the crossing direction. 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 transmitted to the cutting blade holder part 4. That is, the rotation of the cutting blade feeding motor 14 is as follows: cutting blade feeding motor 14 - gear 15 - feed screw 16 - threaded part 18 -> slider 17 - first arm 2
0 → the second arm 21 - the cutting blade holder part 4 - the cutting blade 23, and after the rotation of the cutting blade feed motor 14 is converted into the forward and backward movement of the slider 17, the outer peripheral surface 5a of the J tube 5 is transmitted. This is further converted into the "approach/separation amount" of the cutting blade holder portion 4 relative to the distance. At this time, the amount of forward/backward movement of the slider 17 is detected by the sensor 19, and this detected amount is fed back to the cutting blade feeding motor 14 via the feedback system 30, so that it is a minute forward/backward movement of the slider 17 in units of tenths. Also, the amount of forward and backward movement of the slider 17 can be adjusted accurately and reliably.

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 rotatably supported by the holder part 24 and is in contact with the outer circumferential surface 5a of the tube 5, so that it can receive rotational driving force (air) for cutting from an air driving source (not shown) through three air hoses. It's Nishide. Since the distance of the cutting blade 23 from the guide flange 6 is determined in advance, the main body 1
By guiding the cutting blade 23 by 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 slider 17 is transmitted to the slider 17 → the first arm 20 → the second arm 21 → the cutting blade holder part 4.
The amount of forward and backward movement ultimately becomes the cutting amount of the tube 5 by the cutting blade 23 supported by the cutting blade holder portion 4. In this way, in the cutting blade feeding device 3 equipped with the sensor 19, the amount of approach/separation from the outer circumferential surface 5a of the cutting blade holder portion 4, that is, the amount of the cutting blade 2
A major feature of this invention is that the amount of cutting in step 3 is adjusted.

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 yarn path 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. Further, 27 is a display indicating the reverse rotation instruction position,
When the main body 1 moves on the outer circumferential surface 5a of the tube 5 to cut it, 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. It is for stopping l.

Incidentally, reference numeral 32 denotes a stop sensor, which is attached near the cutting blade 23 and connected to the drive motor 8 in order to detect the "cutting surface", that is, the outer circumferential surface 5a of the tube 5. A proximity switch is adopted as this sensor 32, and the cutting blade 2
3 bites into the pipe 5 and cuts the sensor 32 and the outer peripheral surface 5a.
When the distance reaches the set amount, the sensor 32
A signal is sent from the drive motor 8 through a circuit (not shown) to stop the power source of the drive motor 8 and the 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 main body is attached. 1 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 meshes with the chain 7 and rotates, thereby moving the main body 1 along the guide flange 6 into the pipe 5.
It is made to run and rotate in the circumferential direction [direction of arrow A]. At this time, the roller 1 that comes into contact with the outer circumferential surface 5a of the tube 5
0 allows the main body 1 to move smoothly.

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 → gear 15 → feed screw 16 → threaded part 18 → slider 17 → first arm 20 → second arm 2
1→cutting blade holder part 4 - cutting blade 23, and the rotation of the cutting blade feed motor 14 is converted into the amount of forward and backward movement of the slider 17, and then further converted into the amount of proximity of the cutting blade holder part 4, and this The amount of proximity of the cutting blade holder portion 4 is the amount of cutting applied to the cutting blade 23.

Setting the rotation/movement amount of the main body 1 and the cutting amount of the cutting blade 23;
The rotation speed) is sent as a signal to the cutting blade feed motor 14 via a circuit (not shown), and the cutting amount of the cutting blade 23 is set and instructed in accordance with the rotation amount.

Biting of the cutting blade 23 into the outer circumferential surface 5a: When the cutting blade feeding motor 14 receives a cutting amount signal corresponding to the rotation amount of the drive motor 8, the cutting blade feeding motor 14→gear 15→feed screw 16→screw Joining part 18 - slider 17 - first arm 2
〇 - Second arm 21 - Cutting blade holder part 4 - Transmits the "rotation amount" to the "advance/retreat amount" of the slider 17, "approach/separation amount" of the cutting blade holder part 4, and finally The “cutting amount” of the cutting blade 23 is determined according to the rotation amount of the drive motor 8.
This will cause 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 amount of forward and backward movement of the slider 17 even if it is a minute amount, and feeds back this detected amount to the cutting blade feeding motor 14. Cutting blade holder part 4
The "approach/separation amount" of the cutting blade 23 can be controlled, and the cutting amount of the cutting blade 23 can 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. When this is detected, the drive of the cutting blade 23 is simultaneously stopped, the drive of the drive motor 8, and the free movement and rotation of the main body 1 are 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 free movement and rotation of the main body is controlled by the amount of forward and backward movement of the slider and the amount of cutting. This is converted into the amount of approach and separation of the blade holder, which ultimately controls the cutting amount of the cutting blade, and furthermore, the amount of cutting into the pipe is fed back to the cutting blade feed motor. Therefore, the amount of cutting can be automatically adjusted, the amount of cutting can be finely adjusted using a sensor provided on the slider, and a clean cut surface with no cracks can be obtained.

[Brief explanation of drawings]

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 indicated by the arrow in FIG. A schematic side view of the blade 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 IV-ff in FIG. 3. 1 - Main body 2 - Drive section 3 - Cutting blade feeding device 4 - Cutting blade holder section 5 - Pipe 5a - Outer circumferential surface 6 - Guide flange 7 - Chain 14 - Cutting blade feeding Motor 17-・Slider 19-Sensor 23 --- Cutting edge A --- Circumferential direction

Claims (1)

[Claims] A guide flange is mounted and fixed at a predetermined position on the pipe so as to surround the outer circumferential surface of the pipe, and a drive section is provided that meshes with a drive chain that runs along the guide flange and is wound around the pipe. In a pipe cutting machine, the main body is self-propelled and rotated on the outer peripheral surface of the pipe through the pipe, 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 rotates according to the amount of free movement and rotation of the main body, a slider is moved forward and backward by this cutting blade feeding motor, and the amount of forward and backward movement of this slider is detected, and the detected amount is used as the cutting blade feed. A cutting blade feeding device including at least a sensor that feeds back to the motor is attached, and the cutting blade holder 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 adjusted to the amount of movement of the slider toward and away from the outer peripheral surface of the pipe. Features: Pipe cutting machine.