JPS606306A - Cutting machine for pipe material - Google Patents

Abstract

PURPOSE:To improve cutting accuracy by allowing a pipe cutting machine placed on a frame to be turned around the pipe via a roller chain. CONSTITUTION:A metal saw 16 is turned, a cutting handle (not illustrated) is turned, and the whole of an electric motor-driven cutter 10 is pushed onto a pipe W to be cut. A frame 11 is turned with a proper speed around the pipe W by means of knobs 28 on both ends of the frame 11. The frame 11 is fixed on the pipe W via a travelling roller 13, and a crawler 36, of a roller chain so that it makes one turn and returns to the original position without any lateral swing. The pipe W is cut through the flat section perpendicular to a pipe core due to the revolution of the metal saw 16 on one flat plane.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cutting machine for pipe materials such as cast iron pipes and ductile cast iron pipes, and particularly to improvements in a cutting machine that is used by being attached to the pipe material itself to be cut.

Conventional cutting machines that attempt to cut the pipe by attaching the cutting machine to the pipe material to be cut (pipe to be cut) and moving the pipe material side υ are running machines equipped with a cutter powered by a motor. There is a type of cutter that is fixed to the pipe to be cut by a roller band that is wrapped around the pipe to be cut, and is self-propelled in the circumferential direction using a chain laid parallel to the roller band as a guide. -11434)
.

In the case of this cutting machine, the accuracy of the cutting machine depends on the tightening condition of the two row bands that fix one cutter to the pipe to be cut. That is,
This is because if twisting or wobbling occurs between the two row bands and one cutter, it will vibrate and pull during cutting, causing it to meander or deviate from the trajectory, significantly deteriorating cutting accuracy. This is particularly true for conventional self-propelled cutting machines, which are bulky and heavy.

Moreover, in conventional cutting machines in which one end of the roller band is attached to a single cutter via a turnbuckle, and the tightening force is adjustable, the turnbuckle part allows rotation and twisting of the roller band. Unless the working conditions are favorable, it will not be possible to suppress the lateral runout of the cutter or even the cutter, resulting in a reduction in cutting accuracy. In particular, in the case of cast iron pipes, ductile cast iron pipes, etc., which have high cutting resistance, the above-mentioned problems become even more pronounced, and therefore, improvements in cutting machines have been desired.

The present invention satisfies the above-mentioned demands, and aims to provide a pipe material cutting machine that can cut pipe materials quickly and with high precision.

The pipe material cutting machine of the present invention that achieves the above object has a stand that is equipped with an electric cutter that can travel around the pipe and move an electric cutter toward the pipe to cut and move the pipe. In a pipe material cutting machine that cuts a pipe material by connecting a roller chain wound around the tube and rotating the frame fixed to the tube to be cut by tightening the roller chain around the tube to be cut, the frame is attached to one end of the frame. A U-shaped connector mounted so as to be swingable about a rotational axis parallel to the pipe to be cut, or provided at the other end of the frame so as to be swingable and rotatable about a rotational axis parallel to the pipe to be cut. One end of a double-row roller chain with transfer rollers on both sides is connected with a pin to either one of the U-shaped connectors that are screwed together with the tightening screws and that clamp the pedestal, while the other end of the chain is connected with a pin. is detachably attached to the other of the connectors.

The configuration of the present invention will be explained in detail below based on an embodiment shown in the drawings.

The pipe material cutting machine of this embodiment mainly includes a pedestal 11 on which is mounted an electric cutter 10 for cutting the pipe W to be cut, and a roller chain 712 for attaching this pedestal 11 to the pipe W to be cut.

The pedestal 11 has running rollers 13 on the bottom side that comes into contact with the tube W to be cut, and is provided so as to be able to run on the tube W to be cut in the circumferential direction. An electric cutter 10 is mounted on this pedestal 11 and is equipped with a safety cover 14 to prevent cutting debris from scattering.

The electric cutter 10 has a waterproof DC motor 15 equipped with a carbide-tipped metal saw 16, and the motor housing 17 is fixed to a frame 11. That is, this electric cutter lO has one side of the motor housing 17 pivotably pinned to the bracket 18 of the pedestal 11, and an arcuate worm wheel 19 fixed to the other side to cut the cut on the pedestal ll. gear train 20 of the mechanism;
By engaging with 21 and 22, it is fixed so as to be swingable.

The cutting mechanism transmits the rotation of the cutting handle 240 via the spiral gill 22.21 to the worm 20 that meshes with the worm wheel 19 on the motor housing 17 side, and by rotating the war wheel 19, the motor housing 17 - Swing the electric cutter 10. In this embodiment, the combination of the worm 20 and the worm wheel 19 prevents reverse rotation, that is, rocking due to the weight of the motor 15, but vibration transmitted from the cutter 16 side causes the worm 20 to reverse. There is a risk. Therefore, the tightening screw 25 is pressed against the worm shaft 23 and the screw 25 is pressed against the worm shaft 23.
Tightening prevents rotation caused by cutting vibration. Note that the worm wheel 19 is attached to the motor housing 17.
A side plate 26 is fixed to the side plate 26 and the stand is fixed to the side plate 26.
In addition, the fan-shaped guide rails on both sides of the worm wheel fit into the fan-shaped guide grooves carved into the side plate 26 and are fixed. The housing 17 and the electric cutter 10 are oscillated.This prevents shaking due to vibration during cutting.Thus, the rotation of the cutting handle 24 causes the motor 15 to oscillate around the connecting bin 27. , pipe to be cut WK
The depth of cut of the cutter 16 can be changed.

Handles 28 are provided at both ends of the pedestal 11, and connectors 2.9.30 for attaching the roller chain 12 are provided. One of the connectors 29 has a generally U-shaped fork end shape, and is attached with a connecting pin 31 so that it can swing in the direction perpendicular to the center of the pipe W to be cut -1 while sandwiching the pedestal 11. It is being Therefore, the connector 29 swings only in the direction perpendicular to the pipe W to be cut, and movement in that direction, for example, lateral vibration, is suppressed by engaging with the pedestal 11. Further, two hooks 33 are swingably attached to the connecting fitting 29 to support a retaining pin 32 at one end of the roller chain 12 at both ends. Therefore, the roller chain 712 is removably connected to the connector 29 at one end of the pedestal 11 by hanging on the hook 33. In addition, the other connector 30 has a tightening force adjustment screw 34.
It is attached to the other end of the pedestal 11 via. The connecting tool 30 has a generally U-shaped fork end shape, and is connected to one end of the roller chain 12. The connector 30 is
Although it is not directly attached to the pedestal 11, it is configured to sandwich the pedestal 11 to suppress lateral vibration. Here, the adjustment screw 34 connecting the pedestal 11 and the connector 30 is connected to a rotating shaft 3 rotatably supported by the pedestal 1.
5 and is rotatably mounted perpendicular to this. The rotating shaft 35 is an axis parallel to the tube W to be cut. Therefore, the tightening force adjusting screw 34 mounted perpendicularly to the rotating shaft 35, and thus the connecting tool 3o supported by the other screw 34, swings in a direction perpendicular to the pipe W to be cut. The tightening force adjusting screw 34 is provided so that it can rotate with respect to the rotating shaft 35 but cannot move in the axial direction.

The roller chain 12 that tightens the pipe W to be cut and attaches the stand 11 to the pipe W to be cut is a broad-gauge chain consisting of at least two rows, and the roller chain 12 has transfer rows 236 attached at regular intervals using connecting pins 12' on both sides of the broad-gauge chain. It has a structure that prevents sideways vibration. The transfer roller 36 is connected to the link plate 12'
The tube to be cut W has a larger diameter and is cut through the row 236.
The roller chain 12 is constructed so as to tighten. That is, using the roller chain 12, the stand 11 is connected to the pipe W to be cut.
Even if it is fixed to the frame, the rolling of the rolling roller 36 will cause the frame to
1 can freely rotate around the pipe W to be cut.

Incidentally, the actual length of the row 2 chain 12 can be adjusted by making the connecting pin 12' of the row 2 chain 12 project to the left and right and replacing it with the retaining pin 32.

Further, in this embodiment, a carbide-tipped metal saw 16 is used as the cutter, and a low-speed, high-torque waterproof series motor is used as its drive source. This combination reliably cuts cast iron pipes, unlike conventional methods that rotate grinding wheels at high speeds.

According to the pipe material cutting machine configured as described above, pipe materials can be easily cut by operating as follows.

First, the pedestal 11 is placed on the pipe W to be cut so that the metal saw 16 is positioned at a predetermined cutting location. and,
The roller chain 12 is wound around the pipe W to be cut.
One end is hooked onto the hook 33 of the connector 29 connected to the pedestal 11, and then the tightening force adjustment screw 34 is tightened to tighten the roller chain 12 and securely fix the pedestal 11. At this time, since the roller chain 12 is gently tightened from the hanging state, it forms a straight trajectory without meandering. Next, loosen the tightening screw 25 and remove the worm shaft 2.
3 is made free so that it can feed into the cut. Therefore, the DC motor 15 is driven by operating the hand switch 37 to rotate the metal saw 16. Then, gradually turn the cutting handle 24 to cut the entire electric power ivy 10 into the pipe W to be cut.
push towards. With the metal saw 16 slightly protruding from the inner circumferential wall of the pipe W to be cut, or with the flesh of the pipe W slightly remaining, feeding is stopped and the worm shaft 23 is fixed with the tightening screw 25. Then, grip the handles 28 at both ends of the pedestal 11 and rotate the pedestal 11 around the tube W to be cut at a suitable speed. The frame 11 is fixed to the tube W to be cut by tightening the row 2 chain 12 via its own running rollers 13 and the rolling rollers 36 of the roller chain 12, so it can rotate once without causing sideways vibration. and return to the original position. At the same time, the pipe W to be cut is cut with a flat cutting edge perpendicular to the pipe core by revolution of the metal saw 16 on one plane, which rotates at low speed with high torque.

After cutting is completed, loosen the adjustment screw 34 and remove the roller chain 712.
Give slack to the roller chain 12, and tighten one end of the roller chain 12
to remove this cutting machine from the pipe W to be cut. Incidentally, a large change in the diameter of the pipe W to be cut can be dealt with by preparing roller chains 12 of different lengths.

As is clear from the above description, the present invention is arranged so that the electric cutter is wound around the tube to be cut at both ends of a frame that is equipped to travel around the tube and move an electric cutter toward the tube to cut. In a pipe material cutting machine that cuts a pipe material by connecting a roller chain and rotating the frame fixed to the pipe to be cut by tightening the low two chains around the pipe to be cut, the frame is attached to one end of the frame. A U-shaped connector mounted so as to be swingable around a rotational axis parallel to the tube to be cut, or a U-shaped connector installed at the other end of the mount so as to be swingable and rotatable around a rotational axis parallel to the tube to be cut. One end of a double-row roller chain with rolling rollers on both sides is connected via a pin to either one of the U-shaped connectors that are screwed together with the tightening screws and clamp the pedestal, while the other end of the chain is connected with a pin. By detachably attaching it to the other connector, the broad-gauge roller chain, which is connected to the pedestal without lateral vibration, can strongly cover the pedestal via the substantially U-shaped connector that clamps the pedestal. Since it is attached to the cutting tube, the frame can be moved around the circumference of the tube to be cut and reliably returned to its original position. For this reason,
According to the cutting machine of the present invention, cutting can be performed with high precision. In addition, in the cutting machine of the present invention, the pedestal is firmly fixed to the pipe to be cut by tightening the wide-gauge roller chain attached via the coupling device so that it does not oscillate sideways relative to the pedestal, so the metal saw is It goes straight and won't get damaged.

[Brief explanation of drawings]

The drawings show an embodiment of the pipe material cutting machine according to the present invention, in which Fig. 1 is a front view, Fig. 2 is a left side view, Fig. 3 is a right side view, and Fig. 4 is a plan view. , Figure 5 shows ■-v in Figure 2.
FIG. 10... Electric cutter, 11... Frame, 12... Roller chain, 15... Motor, 16... Metal saw, 29. 30... Connector, 34... For adjusting tightening force Screw, 35...rotating shaft, W...pipe to be cut. Figure 2 n V 3rd WA 10

Claims (1)

[Claims] A roller chain that is wrapped around the tube to be cut is connected to both ends of a frame that is equipped to run around the circumferential surface of the tube to be cut and move an electric cutter toward the tube to cut, and by tightening the low 2 chain. In a pipe material cutting machine that cuts the pipe material by rotating the stand fixed to the pipe to be cut around the circumference of the pipe to be cut, one end of the stand is swingable about a rotation axis parallel to the pipe to be cut. A U-shaped connector attached to the mount or a tightening screw provided at the other end of the mount so that it can swing and rotate freely about a rotation axis parallel to the pipe to be cut, and clamp the mount. Connect one end of a double-row row chain with transfer rollers on both sides to one of the U-shaped connectors that you find, while the other end of the chain is detachably attached to the other of the connectors. A pipe material cutting machine characterized by: