JPH06155143A - Small diameter pipe cutting device - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a device for cutting a small-diameter pipe in a narrow place or a high place from the inside by manual or remote control. [Structure] Rotating shaft 1 for supporting the reaction force against the cutter blade
A power transmission member for inserting the cutter blade feed shaft 3 eccentrically inserted into the rotary shaft 1 and the cutter blade 2 mounted on the cutter blade feed shaft 3 into the pipe 4 and rotating the rotary shaft 1 from the outside. 5, a cutter blade feed force storage means 8 using a spring, and a cutter blade pushing force transmission member 10 for transmitting the cutter blade pushing force of the power storage means 8 to the cutter blade 2 via the cutter blade feed shaft 3. The cutter blade 2 is constantly pressed against the inner circumference of the pipe 4 by the elasticity accumulated in the force accumulating means 8 for cutting.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting apparatus for a reprocessing plant melting tank connecting small diameter pipe or a reactor pressure vessel connecting small diameter pipe.

[0002]

2. Description of the Related Art FIG. 4 is a diagram showing an example of a first prior art.
In FIG. 4, 51 is a disc cutter, 52 is a hydraulic cylinder, 53 is a hydraulic piston, 54 is an object to be cut such as piping, 55 is a roller, 56 is a drive shaft, 57 is a hydraulic hose,
Reference numeral 58 is a hydraulic unit, 59 is a hydraulic motor, 60 is a speed reducer, 61 is a revolution, and 62 is a rotation.

First, a disk cutter 51, a hydraulic cylinder 52, a hydraulic piston 53, a roller 55, and the like constitute a cutter head, and the cutter head is inserted into an object to be cut (hereinafter referred to as pipe) 54, and the disk cutter 51. To the cutting part. The cutter head is connected to a drive shaft 56 in which a hydraulic hose 57 is installed and which is rotatably connected to a hydraulic motor 59 and a speed reducer 60. On the upstream side of the hydraulic motor 59, a hydraulic unit 58 that supplies high-pressure hydraulic oil is arranged.

After confirming that the disc cutter 51 is at the predetermined position, pressure oil is supplied to each hydraulic cylinder 52 through the hydraulic hose 57 to push the hydraulic piston 53 to the pipe 54 side. Along with that, disk cutter 5
1 contacts the inner surface of the pipe 54, and by supplying pressure oil, one or more rollers 55 arranged on the opposite side of the disk cutter 51 contact the inner surface of the opposite pipe. By supplying pressure oil to the hydraulic motor 59 in this state, the drive shaft 56 rotates (revolution 61), and the cutter head rotates in the same direction accordingly. Since the disc cutter 51 and the roller 55 are pressed against the inner surface of the pipe 54 by hydraulic pressure, the disc cutter 51 and the roller 55 revolve in the same direction as the drive shaft 56 while rotating in the opposite direction (rotation 62), The cutting operation of the pipe 54 is started.

Although the pressing pressure of the disc cutter 51 against the inner surface of the pipe decreases as the pipe 54 is cut, by constantly supplying pressure oil from the hydraulic unit 58 into the hydraulic cylinder 52, Cutter 51
Is always pressed against the pipe 54 with a constant pressure to continue the cutting operation.

After the cutting of the pipe 54 is completed, the hydraulic cylinder is operated in the reverse direction. Along with that, the disc cutter 51 and the roller 55 change their positions toward the central portion of the pipe 54. Next, the drive shaft 56 is pulled out to the outside of the pipe 54 so that the cutter head is also pulled out of the pipe 54, and the cutting work of the pipe 54 is completed.

FIG. 5 is a view showing a second prior art example, and is a sectional view of a steel pipe cutting apparatus described in Japanese Patent Application No. 63-221174. The second example of the prior art is the same as the example of the first example of the prior art, in which the inside rotary disc cutter before that was mainly used in the civil engineering construction work, and the outside diameter is 400 mm to 1500 mm and the vertical diameter is large. That had been intended for pipes installed in
It had a relatively small diameter of 00 mm and was devised so that it could also be applied to pipes installed horizontally.
Even so, it is a device proposed for the purpose of reducing the size and weight of a structure that is still complicated and large and enabling the remote control of steel pipe cutting.

In FIG. 5, if the phase of the blade feed shaft 73 is set so that the axis of the eccentric shaft 71 coincides with the axis of the rotating shaft 72, and the rotating shaft 72 is inserted into the steel pipe 74 in this state, the The cutter blade 76 attached to the tip of the rotary shaft 72 faces the desired cutting position via the force metal 75.

In the above state, the blade feed shaft 73 is rotated about the rotary shaft 72, and the periphery of the rotated cutter blade 76 is brought into pressure contact with the inner peripheral surface of the steel pipe 74. The outer peripheral surface on the opposite side to the inner surface of the steel pipe 74 is in pressure contact with the rotary shaft 72 via the reaction metal 75 and the cutter blade 7
6 will be the reaction force support. When the rotary shaft 72 is rotated in this state, the blade feed shaft 73 is rotated in the same direction via the clutch, and the blade tip of the cutter blade 76 rolls on the inner peripheral surface of the steel pipe 74, and the inner peripheral surface is rotated. Make a break in the.

When the rotary shaft 72 is rotated a predetermined number of times, the blade feed shaft 73 is rotated by a required angle, the cutter blade 76 is fed into the steel pipe 74, and the rotary shaft 72 is rotated again to perform cutting. When the blade feed shaft 73 is rotated little by little for each predetermined rotation of 72 and the feeding of the cutter blade 76 is repeated, the cutting of the steel pipe 74 by the cutter blade 76 progresses, and the blade feed shaft 73 is rotated by 180 ° in a phase. The cutter blade 76 is in the maximum protruding state, and the cutting of the steel pipe 74 is completed. After the cutting is completed, the blade feed shaft 73 is adjusted so that the axis of the eccentric shaft 71 matches the axis of the rotary shaft 72.
Is rotated, and the rotary shaft 72 is pulled out from the remaining steel pipe 74. In FIG. 5, 80 is an actuator for rotating the rotating shaft 72, 81 is an elevating frame, 82 is a swing actuator, 83 and 86 are bevel gears, 84 is a rotating frame, 85 is a spur gear, 87 and 91 are undulating shafts, 88 Is an intermediate shaft, 89 is a gear, and 90 is a hoisting actuator.

[0011]

Thus, even in the above-mentioned conventional technique, the cutter head is fed into the pipe,
It has been possible to cut the pipe from the inside by pressing the cutter blade into the pipe and rotate it with an actuator such as a hydraulic cylinder, or to perform it by remote control. However, all of the above-mentioned conventional techniques are limited to those in which the size of the cutter head is relatively large, and the pipe that can be naturally applied is relatively large by inserting the cutter head into the pipe and cutting. At the same time, it had a problem that its structure was complicated.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a cutting device which can be applied to a small-diameter pipe with a simple structure and can be easily cut by remote control. .

[0013]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention relates to a rotary shaft having one end inserted into a tube to be cut, with a position eccentric to the center of the rotary shaft. A cutter blade feed shaft that penetrates in the direction is rotatably provided,
A cutter blade that is eccentric to the center of the cutter blade feed shaft is attached to the tip of the cutter blade feed shaft that projects from one end of the rotary shaft, and the other end of the rotary drive is located outside the tube of the rotary shaft. Providing a power transmission member that transmits rotation to the rotation axis,
Between the other end side of the rotary shaft and the rear end side of the cutter blade feed shaft, elasticity for giving rotation to the cutter blade feed shaft with respect to the rotary shaft is accumulated, and it is detachable from the cutter blade feed shaft. This is a structure in which a cutter blade feeding force storage means is provided.

[0014]

Embodiment 1 An embodiment of the present invention will be described below with reference to FIGS. 1 to 3 of the accompanying drawings.

1 and 2 are views showing a first embodiment based on the present invention. FIG. 1 is a sectional view showing a main part of a cutting device for a small-diameter pipe, and FIG. 2 is a partially cutaway view showing the entire shape. It is an external view. In FIG. 1 and FIG. 2, 1 is a cutter blade pressing reaction force supporting rotary shaft (hereinafter, referred to as a rotary shaft), 2 is a cutter blade, and 3
Is a cutter blade feed shaft, 4 is a tube to be cut, 5 is a power transmission member, 6 is a belt, 7 is a spring, 8 is a cutter blade feeding power storage means, 9 is an adjusting knob, and 10 is a cutter blade pressing force transmission member. , 11 is a cutting torque fixing knob, 12 is an axis center of a rotating shaft, 13 is an axis center of a cutter blade feed shaft, 14 is an axis center of a cutter blade, and 15 is a motor.

The rotary shaft 1 is formed to have an outer diameter slightly smaller than the inner diameter of the pipe 4 to be cut, and the cutter is located at a position eccentric from the axial center 12 of the rotary shaft 1 in the inner axial direction of the rotary shaft 1. A through hole 1a for inserting the blade feed shaft 3 is formed, one end of the rotating shaft 1 is inserted into the pipe 4, and the other end is connected to the pipe 4.
It is outside and is engaged with the power transmission member 5 by a pin, a key, or the like. The power transmission member 5 is a member that transmits the power generated by a rotary driving machine such as the motor 15 to the rotary shaft 1 by the belt 6 and the like.

The tip of the cutter blade feed shaft 3 inserted into the through hole 1a formed in the rotary shaft 1 inside the tube 4 has an eccentricity between the shaft center 12 of the rotary shaft and the shaft center 13 of the cutter blade feed shaft. The cutter blade 2 is attached so as to be eccentric from the center of the cutter blade feed shaft by the same value as.

The cutter blade feed shaft 3 is inserted through the pipe 4 of the power transmission member 5 and a cutter blade feed power storage means 8 is provided. The cutter blade feed power storage means 8 and the power transmission member 5 are connected to each other. Are engaged via a spring 7. A cutter blade pressing force transmission member 10 is further provided outside the pipe 4 of the cutter blade feeding power storage means 8 so as to insert the cutter blade feeding shaft 3 therethrough.
Is fixed to the cutter blade feed shaft 3 by a pin 24 and the like, and the pin 2 has a cutting torque fixing knob 11.
1 is engaged with the hole 22 of the cutter blade pressing member 8 to engage with the cutter blade pressing member 8.

[0019]

[Operation 1] The tube 4 is cut by the following procedure. First, the cutting torque fixing knob 11 is pulled out to make the cutter blade pressing force transmission member 10 rotatable with respect to the rotary shaft 1, and the cutter blade feed shaft 3 is rotated, so that the shaft center 14 of the cutter blade 2 is rotated. 1 so that it is located at the center 12 of the axis. In this state, the cutter blade 2 is inserted into the tube 4 until it reaches the planned cutting position.

Next, the cutter blade pressing force transmitting member 10 is rotated to rotate the cutter blade feed shaft 3 so that the cutter blade 2 attached eccentrically to the tip is brought into contact with the inner surface of the pipe 4. Next, the cutter blade feeding force accumulating means 8 is rotated by the adjusting knob 9 to sufficiently open the spring 7 between the rotation transmitting member 5 and the spring 7 to accumulate elasticity, and in that state, the cutting torque fixing knob 11 The pin 21 is pushed into the hole 22 of the cutter blade feeding force accumulating means 8 so that the cutter blade pressing force transmitting member 10 and the cutter blade feeding accumulating means 8 are pushed.
Engage and. It is safer to use the spring 23 or the like for the cut torque fixing knob 11 as shown in FIG. 1 so as to securely engage the both members 8 and 10.

As a result, the restoring force accumulated in the spring 7 is transmitted to the cutter blade pressing force transmission member 10, and the member 10 is firmly engaged with the cutter blade feed shaft 3 so that the cutter blade feed accumulated force is stored. A twisting force acts on the means 8 and is transmitted to the cutter blade feed shaft 3, so that the cutter blade 2 attached to the inner tip of the tube 4 is constantly pressed against the inner surface of the tube 4.

By driving the motor 15 in this state, power is transmitted to the power transmission member 5 via the belt 6, and the entire cutting device shown in FIG. 1 rotates to cut the pipe 4. At that time, the cutter blade 2 moves outward due to the elasticity of the cutter blade feeding force storage means 8 as the cutting of the tube 4 progresses, and the reaction force of the pressing force of the cutter blade 2 against the tube 4 causes the cutter blade feeding shaft 3 to move. Acting on the rotary shaft 1 through
Is formed to have an outer diameter slightly smaller than the inner diameter of the tube 4, so that the cutter blade 2 continues the cutting operation while maintaining a sufficient pressing force, and completes the cutting of the tube 4.

After the cutting of the pipe 4 is completed, the cutter blade feed shaft 3 is rotated by the procedure reverse to that at the start of the cutting so that the shaft center 14 of the cutter blade coincides with the shaft center 12 of the rotary shaft 1, After the blade 2 is positioned at the center of the tube 4, it is pulled out of the tube to complete the cutting operation.

[0024]

Second Embodiment FIG. 3 shows a second embodiment according to the present invention. The cutting device of the second embodiment has a structure capable of cutting a small-diameter pipe having a diameter slightly larger than that of the first embodiment and responding to a change in pipe diameter by partial replacement. ing.

In the second embodiment, the same parts as those in the first embodiment described above are designated by the same reference numerals to replace the description.

In FIG. 3, the rotary shaft 1 and the cutter blade feed shaft 3 are shortened, and a support plate 31 is rotatably held midway near the tip end side thereof, and a cylindrical extension shaft 32 is provided at the tip of the rotary shaft 1. , A screw roller or the like is connected in a coaxially arranged manner so as to be detachable, and a guide roller 33 for supporting a reaction force is replaceably attached to the tip end portion of the extension shaft 32 so as to be replaceable. A torsion shaft 34 is coaxially connected to the tip of 3 via a joint 35 so as to be detachable.

The extension shaft 32 and the torsion shaft 34 are
By sequentially adding short ones using each joint,
The length is set to a required length, and the torsion shaft 34 is eccentrically arranged with respect to the extension shaft 32.

A center support pipe 36 is detachably fixed to the front surface of the support plate 31 with bolts so as to be arranged coaxially with the rotary shaft 1, and the pipe 36 is attached to the outer periphery of the center support pipe 36 on the base side. The ring 37 that receives the end of the tube 4 into which the is inserted is fixed so that the position can be adjusted.

The outer diameter of the center support pipe 36 is the pipe 4.
The inner diameter of the guide roller 33 and the outer diameter of the guide roller 33 are set to be slightly smaller than the inner diameter of the pipe 4, and the center support pipe 36 and the guide roller 33 are respectively adjusted to change the inner diameter of the pipe 4 to be cut. It should be replaced with one that fits the inner diameter of 4.

A cutter blade mounting base 38 is attached to the tip of the torsion shaft 34. The mounting base 38 is a fixed base 39 fixed to the torsion shaft 34, and a radial position adjustment of the torsion shaft 34 is performed on the fixed base 39. The movable blade 40 is mounted so as to be freely movable, and the cutter blade 2 is rotatably mounted near one end of the movable holder 40.

Therefore, by adjusting the position of the movable table 40, the eccentric amount of the cutter blade 2 with respect to the torsion shaft 34 can be freely set according to the inner diameter of the tube 4.

In the second embodiment, the rear end of the cutter blade feed shaft 3 is an angular shaft 41 projecting rearward from the cutter blade pressing force transmission member 10, and the angular shaft 41 is detachably engaged. The cutter blade feed shaft 3 is rotated by the handle 42, and the shaft center 14 of the cutter blade 2 can be set so as to be on the shaft center 12 side of the rotary shaft 1.

The force accumulating means 8 connects a disc 8a externally fitted and fixed to the rotary shaft 1 and a disc 8b externally fitted and fixed to the cutter blade feed shaft 3 by a spring 7, and inside the spring 7. A large number of free discs 8 fitted onto the rotary shaft 1
In addition to arranging c, a disk 8d that is free from the cutter blade feed shaft 3 is provided between the disk 8b and the cutter blade pressing force transmission member 10, and the disk 8d and the disk 8a are provided.
Are connected by a plurality of rods 8e, and a cutting torque fixing knob 11 is attached to the cutter blade pressing force transmitting member 10 overlapping the disk 8d, and the cutting torque fixing knob 1 is attached to the disk 8d.
It has a structure in which a large number of holes 22 through which the first pin 21 is engaged and disengaged are provided concentrically.

In order to store the turning force of the cutter blade 2 in the power storage means 8, in the state where the extension shaft 32 is inserted in the pipe 4, the cutting torque fixing knob 11 is pulled to push the cutter blade pressing force transmission member. 10 and the disk 8d are uncoupled, the handle 4
When the cutter blade feed shaft 3 is rotated by 2, the cutter blade 2
The disk 8b during the rotation until it contacts the inner surface of the pipe 4.
When the cutting torque fixing knob 11 is locked in the hole 22 in this state, the restoring force of the spring 7 causes the restoring force of the cutter blade 2 to rotate. Will be given as a turning force.

[0035]

FUNCTION 2 Cutting of the tube 4 in the second embodiment is carried out by the following procedure.

First, the center support pipe 36 and the guide roller 3 having an outer diameter suitable for the inner diameter of the pipe 4 to be cut.
3, the center support pipe 36 is fixed to the front surface of the support plate 31 so as to be arranged coaxially with the rotary shaft 1, and the extension shaft 32 of a predetermined length is connected to the tip of the rotary shaft 1.
The guide roller 33 is attached to the outer side of the cutter blade, and the cutter blade mounting base 38 of the torsion shaft 34 connected to the cutter blade feed shaft 3 is operated to set the eccentric amount of the cutter blade 2 according to the inner diameter of the tube 4.

Next, the notch torque fixing knob 11 is pulled out, the cutter blade pressing force transmission member 10 is set in a rotatable state, the cutter blade feed shaft 3 is rotated, and the shaft center 14 of the cutter blade 2 is set to the rotary shaft 1. Position the shaft center 12 side, insert the torsion shaft 34 from the cutter blade 2 into the pipe 4 in this state, insert the end of the pipe 4 between the center support pipe 36 and the ring 37 and press it against the cutter blade. 2 reaches the planned cutting position.

After this, similarly to the first embodiment described above, the tube 4 of the cutter blade 2 is rotated by the rotation of the cutter blade feed shaft 3.
To the inner surface of the blade, elastic storage of the spring 7 by rotation of the cutter blade feed force storage means 8, engagement of the cutter blade feed force storage means 8 and the cutter blade pressing force transmission member 10, pipe of the cutter blade 2. Power transmission member 5 after being pressed against the inner surface of 4
By sequentially rotating the above, the tube 4 is cut by the cutter blade 2 using the guide roller 33 as a reaction force.

[0039]

As described above, the present invention has the following effects as described in the above embodiments.

A cutter blade is inserted into the pipe,
By using only the cutter blade feed shaft and the rotary shaft through which the cutter blade feed shaft is inserted, it is possible to cut a pipe having a small diameter, which could not be achieved conventionally.

Due to the extremely simple construction,
Remote operation is easy and reliable.

Equipment costs and operating costs can be significantly reduced.

Since the cutting is performed by a push-cut method rather than cutting, no chips are generated and the cutting can be performed while maintaining high safety even when the piping is radioactive.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of a cutting device for a small diameter tube according to the present invention.

FIG. 2 is a partially cutaway external view showing a first embodiment of a cutting device for a small diameter pipe based on the present invention.

FIG. 3 is a sectional view showing a second embodiment of the cutting device for a small diameter tube according to the present invention.

FIG. 4 is a diagram showing an example of a first conventional technique.

FIG. 5 is a diagram showing an example of a second conventional technique.

[Explanation of symbols]

 1 Rotating Shaft 2 Cutter Blade 3 Cutter Blade Feeding Axis 4 Tube 5 Power Transmission Member 6 Belt 7 Spring 8 Cutter Blade Feeding Accumulation Means 9 Adjustment Knob 10 Cutter Blade Pushing Force Transmission Member 11 Cutting Torque Fixing Knob 12 Rotating Shaft Axis Center 13 Cutter blade feed axis center 14 Cutter blade axis center 15 Motor 51 Disc cutter 52 Hydraulic cylinder 53 Hydraulic piston 54 Piping 55 Roller 56 Drive shaft 57 Hydraulic hose 58 Hydraulic unit 59 Hydraulic motor 60 Reducer 61 Revolution 62 Rotation 80 Actuator 81 Lifting frame 82 Revolving actuator 83,86 Bevel gear 84 Rotating frame 85 Spur gear 87,91 Shaft for raising / lowering 88 Intermediate shaft 89 Gear 90 Lifting actuator for raising / lowering

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kikuo Sakurai 9-23 Narita-cho, Neyagawa City (72) Inventor Tadashi Abe 2-4-25 Minamisuna, Koto-ku, Tokyo Kawasaki Heavy Industries Ltd. Tokyo Design Office ( 72) Inventor Keisuke Sato 118 Futatsuka, Noda City, Chiba Prefecture, Kawada Heavy Industries Noda Plant (72) Inventor Yasunari Nakayama 118, Futtsuka City, Noda City, Chiba Prefecture Kawasaki Heavy Industries, Ltd. Noda Plant

Claims (1)

[Claims] 1. A cutter blade feed shaft that axially penetrates a rotary shaft having one end side inserted into a pipe to be cut, the position being eccentric to the shaft center of the rotary shaft, and the rotary shaft of the rotary shaft A cutter blade that is eccentric with the center of the cutter blade feed shaft is attached to the tip of the cutter blade feed shaft that protrudes from one end side, and the rotation of the rotary drive is rotated on the other end side that is located outside the rotary shaft tube. A power transmission member for transmitting to the cutter blade is provided between the other end of the rotary shaft and the rear end of the cutter blade feed shaft to accumulate elasticity that causes the cutter blade feed shaft to rotate with respect to the rotary shaft. A cutting device for small diameter pipes equipped with a cutter blade feed force accumulator that can be engaged and disengaged with the feed shaft.