JPS599287B2 - Pipe cut detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tube cutting detection device that detects when cutting of a tube body is completed.

In the manufacturing process of cast iron pipes, etc., a disc-shaped grindstone is often used to cut the cast iron pipes to a predetermined length.

However, when carrying out this cutting operation, conventionally the operator had to monitor the cutting operation and visually detect the completion of the cutting, resulting in poor work efficiency.

Further, when attempting to automate this tube cutting operation, it is necessary to detect that the cutting is completed, and therefore, a suitable detection device has been desired.

SUMMARY OF THE INVENTION An object of the present invention is to provide a pipe cutting detection device that detects when cutting of a pipe body has been completed, thereby improving the efficiency of cutting work and easily achieving automation of the cutting work. be.

For this reason, the present invention provides a rotary grindstone that is rotated in the same direction as the feeding direction of the tube body to cut the tube body, a rolling bearing whose inner ring is arranged so as to be able to rotate integrally with the rotating shaft of the rotary grindstone,
A guide roller is fitted onto the rolling bearing and rotated in a direction opposite to the rotating direction of the rotary grindstone with its outer circumferential surface abutting the tubular body upon completion of cutting; a detection fitting having an arm protruding from the outer periphery of a ring that is slidably pressed by the guide roller; and a pair of stoppers that lock the arm that rotates as the guide roller rotates to restrict its rotation range. and a sensor that detects the rotation of the arm due to the reverse rotation of the guide roller.

In other words, while cutting the tube at a predetermined depth of cut, the guide roller is positioned away from the tube, and the arm of the support fitting is locked at one stopper due to the friction of the bearing. ing.

Now, when cutting is completed, the rotary grindstone is moved in the direction of the tube axis by its pressing force, and the guide roller comes into contact with the tube and is rotated in a direction opposite to the above-mentioned rubbing direction.

At the same time, the arm leaves the one stopper and turns toward the other stopper, so if this turning is detected by a suitable sensor such as a proximity sensor,
Completion of cutting can be easily detected.

Therefore, the detection work, which conventionally required visual inspection by an operator, can be performed automatically, and the efficiency of the cutting work can be improved, and automation of this cutting work can be easily achieved.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

Figure 1 is a partially cutaway view, Figure 2 is the ■- in Figure 1.
■It is a sectional view.

As shown in FIG. 2, 1 is a tube that is rotated slowly in the rotational feeding direction A, and 2 is a disc-shaped tube that is rotated at high speed in the same direction B as this tube 1 to cut the tube 1. It is a rotating whetstone.

Reference numeral 3 denotes a swing frame to which the rotary whetstone 2 is attached, and is configured to be swingable in vertical directions C and D around a central axis outside the left view in FIG. This is to press the tubular body 1 and separate it from the tubular body 1.

In FIG. 1, 4 indicates a bolt 5 attached to the swing frame 3.
This is a rotating shaft that is supported by a bearing in a tightened bearing case 6 and rotated at high speed by a power source not shown.

A whetstone clamping flange 7 is secured with a key 8 to the rotary shaft 4, and the whetstone 2 is mounted between the whetstone clamping flange 7 and the whetstone clamping flange 9 fitted onto the tip of the rotary shaft 4. It's being pinched.

Reference numeral 10 denotes a tightening nut which is screwed onto the tip of the rotating shaft 4 and is used to press and hold the grindstone 2 by the grindstone tightening flanges 7 and 9.

Deep groove ball bearings 11A and 11B with seals are fitted onto the hollow shaft portion 7a of the grindstone tightening flange 7 in a double row combination.

The bearings 11A and 11B also include a roller portion 12a with a slightly larger diameter than the grindstone tightening flange 7, and a hollow shaft portion 12b.
A guide roller 12 integrally formed with the guide roller 12 is fitted onto the outside.

13 and 14 are retaining rings. Guide roller 12
A washer 15 and a stepped washer 16 are slidably fitted onto the hollow shaft portion 12b.
A sensing metal fitting 17 having a thicker wall than the stepped portion is slidably fitted onto the stepped portion.

Reference numeral 18 denotes a disc spring that is locked to the retaining ring 19, and connects the detection fitting 17 to the roller portion 12 through washers 15 and 16.
It is slidably pressed against the side surface of a.

The detection fitting 17 is a ring 2 concentric with the guide roll 12.
0 and an arm 21 protruding from this ring 20, this arm 21 has a plate body 21a disposed circumferentially at its tip, and stoppers 22A and 22B, which will be described later.
It has a locking piece 2lb that is locked to.

The swing frame 3 has a pair of stoppers 22A, 2
2B are erected at predetermined intervals, and the locking pieces 2
By locking the arm 21, the range of movement of the arm 21 is restricted.

An electromagnetic proximity sensor 23 is disposed near the stopper 22B so as to face the plate 21a at a short distance when the locking piece 2lb is locked with the stopper 22B.

Explain the action.

The tubular body 1 to be cut is slowly rotated in the rotation feed direction A, while the grindstone 2 is rotated at high speed in the same direction B as the tubular body 1.

If the swing frame 3 is swung in the direction D and the grindstone 2 is pressed against the tubular body 1, the tubular body 1 will be gradually cut in the circumferential direction at a predetermined cutting depth.

At this time, the guide roller 12 is in a position away from the tube body 1, and the grinding wheel 2 is
The locking piece 2 of the detection fitting 17 is applied with rotational force in the same direction as the
It is stopped with lb pressed against the stopper 22A.

When the cutting is completed, the grinding wheel 2 is moved in the tube axis direction by the pressing force of the swing frame 3, and the guide roller 12 has its outer circumferential surface abutted against the outer circumferential surface of the tube body 1 as shown in the figure. The grindstone 2 is rotated in a direction E opposite to the rotation direction B.

Then, due to the frictional force between the roller part 12a and the side surface,
The arm 21 of the detection fitting 17 is also turned toward the stopper 22B, and is stopped by the locking piece 21b being locked with the stopper 22B.

At this time, the plate body 21a faces the proximity sensor 23, and it is detected that the arm 21 has turned in the direction E opposite to the grindstone 2, and it is detected that the cutting is completed.

The guide roller 12 comes into contact with the tube body 1 and continues to be rotated in the direction E.

When the swing frame is swung in the direction C by the detection signal from the proximity sensor 23 and the grindstone 2 is separated from the tube body 1, the work is completed.

Note that the position of the proximity sensor 23 is not limited to the vicinity of the stopper 22B, and may be arranged, for example, in the vicinity of the stopper 22A to detect the turning of the arm 21 in the direction E.

In addition to the electromagnetic type described above, an appropriate type of proximity sensor 23 can be used.

As described above, according to the present invention, it is possible to easily detect that the cutting of the pipe body by the rotary grindstone has been completed, so that the efficiency of the detection work can be improved compared to the conventional detection work performed visually by the operator. In addition, automation of this cutting work can be easily achieved.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway view showing an embodiment of the present invention, and FIG. 2 is a sectional view thereof. 1... Pipe body, 2... Rotating grindstone, 4... Rotating shaft, 1
1A11B...Deep groove ball bearing (rolling bearing), 12.
... Guide roller, 17 ... Detection fitting, 20 ... Ring, 21 ... Arm, 22A, 22B ... Stopper, 23 ... Electromagnetic proximity sensor.

Claims (1)

[Claims] 1. A rotary grindstone that is rotated in the same direction as the rotating feed direction of the tube body to cut the tube body, a rolling bearing whose inner ring is arranged to be able to rotate integrally with the rotating shaft of the rotary whetstone, and an outer ring attached to this rolling bearing. A guide roller is fitted into the guide roller and rotated in a direction opposite to the rotating direction of the rotary grindstone with its outer circumferential surface abutting the tubular body upon completion of cutting, and is slidable concentrically on the side surface of the guide roller. a detection fitting having an arm protruding from the outer periphery of the ring to be pressed; a pair of stoppers that lock the arm that rotates as the guide roller rotates to restrict its rotation range; and the guide roller. A tube cut detection device comprising: a sensor for detecting rotation of the arm as the arm is reversed.