JPH0970796A - Rotary pipe cutting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary pipe cutting device to dispense with adjustment of the vertical position of a work table associated with the change in the diameter of a pipe to be cut. SOLUTION: When a pipe P is carried into a cutting part 5 by a guide roller 11 of a carry-in part 3 and when the pipe P which is carried is cut by a disk cutter, a clamper 13 provided on the upper side of the guide roller 11 closer to the cutting part of the carry-in part 3 is lowered to fix the pipe P, and a height detecting means 23 detects the height of the clamper and transmits the height to a control part 25. The control part 25 controls an elevating mechanism 27 based on the height signal to adjust the height of the cutting part 5. An operation part 45 of the control part 25 calculates the diameter of the pipe P based on the height signal, and calculates the required quantity (one half of the change in diameter) to move the cutting part 5 associated with the change in diameter of the pipe P. A command part 47 controls the elevating mechanism 27 based thereon to move and position the cutting part 5 in the vertical direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary pipe cutting device, and more particularly to a rotary pipe cutting device for aligning the center of a pipe to be cut with the center of a cutting machine.

[0002]

2. Description of the Related Art As shown in FIG. 8, in a conventional rotary pipe cutting apparatus, a pipe P, which is a material to be cut, is positioned and fixed in the center of a pipe cutting machine 101, and a few pieces of the material are rotated. While pressing the disk cutter 103 against the pipe P, the pipe P is cut by revolving along the track RV as a whole.

As shown in FIG. 9, a work table 105 into which a pipe P is carried is provided with a plurality of guide rollers 109 having a recess 107 formed in the center thereof.
Above the guide roller 109 near the cutting machine 101 of the work table 105, a pressing roller 111 (not shown) which is vertically movable by a cylinder or the like is provided. Therefore, the pipe P is carried in between the guide roller 109 and the pressing roller 111.

At the time of cutting, if the diameter D of the pipe P changes, the height position of the center PC of the pipe P also changes. Therefore, by adjusting the height of the work table 105, the center PC of the pipe P changes to the pipe. It is adjusted to match the center of revolution DC of the disk cutter 103 of the cutting machine 101.

[0005]

However, in such a conventional technique, as the length of the pipe P becomes longer, the length of the work table 105 becomes longer accordingly. Vertical movement / positioning becomes more difficult as the work table 105 becomes larger.

An object of the present invention was made in view of the above-mentioned conventional technique, and a rotary pipe cutting device which eliminates the need for adjusting the vertical position of a work table according to the change in the diameter of the pipe to be cut. To provide.

[0007]

In order to achieve the above object, a rotary pipe cutting apparatus according to a first aspect of the present invention comprises a loading section having a guide roller for loading and loading a pipe to be cut. A rotary pipe cutting device comprising a cutting unit for cutting and processing a pipe carried in by the carrying-in unit by a disk cutter, and a carrying-out unit for carrying out the cut pipe, wherein the cutting unit is vertically moved and positioned. It is characterized by comprising a lifting mechanism.

Therefore, when a pipe, which is a material to be cut, is carried into the cutting portion by the guide roller of the carry-in portion, the cutting portion is moved up and down by the elevating mechanism according to the diameter of the pipe of the material to be cut,
The cutting process is performed with the center of the pipe diameter of the material to be cut and the center of the cutting portion aligned.

A rotary pipe cutting device according to a second aspect of the present invention is the rotary pipe cutting device according to the first aspect, further comprising a clamper provided above the guide roller near the cutting portion of the carry-in portion so as to be vertically movable. It is characterized by comprising height detecting means provided for detecting the height position of the clamper, and a control section for receiving the signal from the height detecting means and controlling the elevating mechanism. .

Therefore, when the pipe which is the material to be cut is carried into the cutting part by the guide roller of the carrying-in part and the pipe into which the disk cutter of the cutting part is carried out is cut, the guide roller near the cutting part in the carrying-in part. At the same time as lowering the clamper installed on the upper side of the to fix the pipe,
The height detecting means detects the height position of the clamper and transmits it to the control section. The control unit controls the elevating mechanism based on the height signal from the height detecting means to adjust the height of the cutting portion so that the center of the pipe diameter of the material to be cut and the center of the cutting portion are aligned with each other. Cutting processing is performed.

According to a third aspect of the invention, in the rotary pipe cutting device of the present invention, the control section according to the second aspect calculates the diameter of the pipe based on the clamper height signal from the height detecting means, and the center of the pipe is cut by the cutting section. And a command unit that controls the elevating mechanism to move the cutting unit by the amount of movement obtained by the calculation unit. It is characterized by.

Therefore, the calculating unit of the control unit calculates the diameter of the pipe based on the height signal from the height detecting means, and calculates the necessary amount for moving the cutting portion according to the change of the diameter of the pipe. Based on the obtained movement amount, the command unit controls the elevating mechanism to vertically move and position the cutting unit.

Further, in the rotary pipe cutting apparatus of the invention according to claim 4, the moving amount of the cutting portion according to claims 2 and 3 is the difference between the diameter of the pipe cut previously and the diameter of the pipe cut next. It is characterized by being half.

Therefore, the calculation unit of the control unit obtains a half amount of the change in the diameter of the pipe and sets it as the required movement amount, and the command unit vertically moves and positions the elevating mechanism by the obtained required movement amount. .

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 to 3 show the entire rotary pipe cutting device 1 according to the present invention. 1 to 3
In the rotary pipe cutting apparatus 1, a work table 3 for placing a pipe P as a material to be cut and feeding a predetermined amount is provided on the left side in the drawing, and a cutting unit for cutting the pipe P on the right side thereof. And a product table 7 as a carry-out unit for carrying out the cut product pipe P is provided on the right side thereof.

The work table 3 has a stocker 9 for stocking the pipes P and a plurality of guide rollers 11 for feeding the pipes P to the pipe cutting machine 5. Also, FIG.
In addition, the guide roller 11 of the work table 3 near the pipe cutting machine 5 has a clamper 1 for fixing or moving the pipe P between the guide roller 11 and the guide roller 11.
3 is provided so as to be able to move up and down.

The clamper 13 is moved up and down by rotating a ball screw 19 via a gear box 17 by a drive motor 15 as an up-and-down moving means, and by vertically moving a ball nut 21 screwed onto the ball screw 19. It is a thing. A rotary encoder 23 as height detecting means is attached to the drive motor 15,
The height signal is transmitted to the control unit 25 described later.

Although not shown, the clamper 13 is provided with a sensor for detecting the pressure applied to the pipe P, and the rotary encoder 23 detects the height position when the sensor detects a predetermined pressure. . The sensor is connected to a control unit 25 (see FIG. 7) described later.

Therefore, when the sensor detects a predetermined pressure, the control unit 25 stops the rotation of the drive motor 15 to stop the descent of the clamper 13, and the position signal of the clamper 13 at this time is transmitted to the control unit 25. To do. The control unit 25 detects the diameter D of the pipe P from this signal.

The cutting portion is a disk cutter 10 for 2-3 sheets.
3 (see FIG. 8), and an elevating mechanism 27 for moving and positioning the pipe cutting machine 5 in the vertical direction so that the revolution center DC of the disk cutter 103 coincides with the center PC of the pipe P. And have.

That is, as shown in FIG. 5, for example, when the previously cut pipe P is used as the reference pipe P0 and its diameter D0 is changed to the diameter D of the pipe P to be cut next, the height of the center PC thereof is changed. Is displaced upward by δD = (D−D0) / 2, and it is necessary to move the pipe cutting machine 5 upward by δD.

As shown in, for example, FIG. 6, the lifting mechanism 27 has a frame 29 and a lifting table 33 which is vertically movable by a guide 31 provided on the frame 29. The elevating table 33 moves up and down by the cooperation of a pinion 37 which is rotationally driven by a drive motor 35 and a rack 39 which is attached to the lower side of the elevating table 33 and meshes with the pinion 37. The drive motor 35 includes a lift 3
A rotary encoder 41 (see FIG. 7) for detecting the height of 3 or the center DC of the pipe cutting machine 5 is attached, and issues a height signal to the control unit 25 described below.

FIG. 7 shows a control unit 25 for positioning the height of the lift 33. The control unit 25 controls the entire rotary pipe cutting device 1, and is further provided in the clamper 13 and the memory 43 for storing the reference data such as the diameter D0 of the pipe P0 previously cut. The position of the pipe P is calculated by receiving the position signal from the sensor, and the operation unit 45 that calculates the required amount of movement of the lift table 33 and the drive motor 35 are controlled from this calculation result to move the lift table 33 up and down. And a command unit 47 for making it. The command unit 47 also controls the vertical movement of the clamper 13 as described above.

The command unit 47 compares the signal from the rotary encoder 39 provided in the drive motor 35 with the calculated amount of movement and commands the drive motor 35 so that the center of the lift table 33, that is, the cutting unit. Accurate positioning of DC is performed.

Therefore, when cutting the pipe P having the diameter D, one of the pipes P stocked in the stocker 9 is supplied onto the guide roller 11, and the clamper 13 is moved downward so that the space between the guide roller 11 and the guide roller 11 is lowered. Insert the pipe P into the. At this time, the control unit 25 calculates the diameter D of the pipe P from the height position of the clamper 13 sent from the rotary encoder 23 mounted on the drive motor 15, and the command unit 47 causes the drive motor 35 of the lifting mechanism 27 to operate. Drive the elevator 33
Is increased by δD. As a result, the pipe cutting machine 5
After ascending by D to match the center PC of the pipe P with the center DC of the pipe cutting machine 5, the cutting process is performed.

From the above results, even if the diameter D of the pipe P to be cut changes, the diameter D is automatically measured and the pipe cutting machine 5
Since the height of the pipe P is adjusted, the center PC of the pipe P and the center DC of the pipe cutting machine 5 can be always matched. As a result, the cutting work for the pipes P having different diameters can be automated and the work efficiency can be improved.

Further, unlike the conventional case where the work table 3 is moved up and down, even if the pipe P to be cut becomes long, it can be dealt with in exactly the same manner, so that the enlargement of the apparatus can be avoided.

The present invention is not limited to the above-described embodiments, but can be implemented in other modes by making appropriate changes. That is, the lift table 33 described in the above-described embodiment is the drive motor 35.
The rack 39 and the pinion 37 are moved up and down, but the same action and effect can be obtained by using a cylinder with a sensor, a ball screw, a ball nut or the like instead.

[0030]

As described above, in the rotary pipe cutting apparatus according to the first aspect of the present invention, when the diameter of the pipe to be cut changes, the elevating mechanism moves the cutting portion up and down to cut. Since the center of the portion is made to coincide with the center of the pipe which is the material to be cut, it is possible to easily perform the cutting work without vertically moving the work table of the loading portion as in the conventional case.

In the rotary pipe cutting apparatus according to the second aspect of the present invention, when the pipe which is the material to be cut is carried into the cutting section by the guide roller of the carrying section and the pipe in which the disc cutter of the cutting section is carried into the cutting processing, , The pipe is fixed by lowering the clamper provided on the upper side of the guide roller near the cutting part in the carry-in part, and at the same time, the height detecting means detects the height position of the clamper and transmits it to the control part,
Since the control unit controls the lifting mechanism based on the height signal from the height detecting means to adjust the height of the cutting portion, the relative height between the pipe and the cutting portion is changed even if the diameter of the pipe to be cut changes. You can adjust the relationship. Along with this, unlike the conventional case where the loading section side is moved up and down, it is possible to avoid an increase in size of the apparatus even if the pipe becomes long.

In the rotary pipe cutting apparatus according to the third aspect of the present invention, the arithmetic unit of the control unit calculates the diameter of the pipe based on the height signal from the height detecting means, and the cutting unit changes in accordance with the change of the diameter of the pipe. The necessary amount of movement is calculated, and the command unit controls the lifting mechanism to move and position the cutting unit up and down based on the obtained movement amount. Only by automatically moving the cutting part, the center of the pipe and the center of the cutting part can be always aligned.

Further, in the rotary pipe cutting apparatus of the invention according to claim 4, the arithmetic unit of the control unit obtains a half of the change in the diameter of the pipe and sets it as the required movement amount, and the command unit raises and lowers by the required movement amount obtained. Since the pipe is vertically moved and positioned, the center of the pipe and the center of the cutting portion can always be automatically aligned, and proper cutting can be performed.

[Brief description of drawings]

FIG. 1 is a side view showing an entire rotary pipe cutting device according to the present invention.

FIG. 2 is a plan view seen from a direction II in FIG.

FIG. 3 is a front view seen from the direction III in FIG.

FIG. 4 is an explanatory view showing a clamper and its lifting mechanism.

FIG. 5 is an explanatory diagram showing a change in center position with a change in diameter.

FIG. 6 is an explanatory view showing an elevating mechanism of an elevating table on which a cutting part is placed.

FIG. 7 is a block diagram showing a control unit.

FIG. 8 is an explanatory view showing the principle of a conventional disc cutter.

FIG. 9 is an explanatory diagram showing a guide roller.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotary pipe cutting device 3 Work table (carrying-in part) 5 Pipe cutting machine (cutting part) 7 Product stand (carrying-out part) 11 Guide roller 13 Clamper 23 Rotary encoder (height detection means) 25 Control part 27 Lifting mechanism 45 Computing part 47 Command unit 103 Disc cutter P Pipe D Diameter

Claims (4)

[Claims] 1. A carrying-in section having a guide roller for loading and carrying in a pipe which is a material to be cut, a cutting section for cutting a pipe carried in by the carrying-in section by a disk cutter, and a cut pipe. A rotary pipe cutting device having a carry-out part for carrying out, comprising a lifting mechanism for vertically moving and positioning the cutting part. 2. A clamper provided above the guide roller near the cutting portion in the carry-in portion so as to be vertically movable, a height detecting means provided for detecting the height position of the clamper, and this height. The rotary pipe cutting device according to claim 1, further comprising a control unit which receives the signal from the detection means and controls the lifting mechanism. 3. The control unit calculates the diameter of the pipe based on the clamper height signal from the height detecting means, and also calculates the movement amount of the cutting unit for aligning the pipe center with the center of the cutting unit. 3. The rotary pipe cutting device according to claim 2, further comprising: a calculation unit that performs the operation, and a command unit that controls the elevating mechanism to move the cutting unit by the amount of movement obtained by the calculation unit. 4. The rotary pipe cutting according to claim 2, wherein the moving amount of the cutting portion is half the difference between the diameter of the pipe cut previously and the diameter of the pipe cut next. apparatus.