JPH1058225A - Device for running cut to standard length in continuous manufacturing facility for thin-walled pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the man-hours for producing a standard length pipe and improve the environment of cutting work while eliminating trimming by precisely performing the running cut of the pipe to a standard length after its continuous manufacture. SOLUTION: A device 6 for running cut to a standard length is directly coupled with a continuous manufacturing facility for thin-walled pipes and is composed of a movable table 9 advancing to and retreating from a continuous pipe (p) fed from the continuous manufacturing facility, a pipe cutter 19 fitted with a rotary blade advancing and retreating on the movable table 9 and drawn off from an inserted into the continuous pipe (p), a ring-shaped stationary die 10 fixed to the table 9 and mating with the rotary blade at the time of cutting a pipe, a clamp which is mounted on the pipe cutter 19 and presses the continuous pipe (p) to the die 10 from the inside at the time of cutting a pipe, another clamp which is installed on the table 9 and fixes the standard length pipe from outside from the time of cutting a pipe to immediately before taking-out the standard length pipe, and a sized pipe takeout/delivery device 53 which is mounted on the movable table.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin-walled tube continuous production facility for continuously welding a butt portion while roll forming into a tubular shape using a metal strip such as stainless steel as a material. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous cutting device for directly cutting a pipe to a required length while moving in synchronization with a pipe forming speed. Here, the thin tube is intended for a tube having a thickness of 0.4 to 1.0 mm and a diameter of 60 mm or more.

[0002]

2. Description of the Related Art A conventional continuous cutting apparatus for continuously manufacturing thin-walled tubes uses a high-speed cutting grindstone or a carbide tip saw as a blade. That is, the tube was cut from the outside.

[0003]

According to the above-mentioned conventional pipe-forming fixed-size cutting, dust generated by the cutting is scattered in a work place, and there is a problem in a work environment. In addition, since burrs are generated on the cut surface of the pipe, it is necessary to remove the burrs and prepare the end face of the pipe. Even if burrs are removed, it is difficult to obtain high-precision dimensions by cutting from the outside of the tube.
Before starting the next processing, it was assumed that the trimming would be performed, and the cut was made longer than the trimming. In other words, the standard length tube obtained by the conventional constant length cutting device directly connected to the conventional thin-walled tube continuous manufacturing equipment has been roughly cut.

[0004] As described above, conventional thin-walled fixed-length tubes are not only required for secondary processing by purchasing them from a tube manufacturer, but also when internally manufactured by a secondary processing company. And the end face must be trimmed,
The blank will be placed in storage for a while. However, the material pipe may be deformed or damaged when transported to the storage location, when transported from the storage location to the secondary processing site, or during storage.

The present invention has been made in view of the above-mentioned problems in a conventional continuous-distance cutting device directly connected to a thin-walled tube continuous manufacturing equipment, and has eliminated trimming by precision cutting, thereby reducing the number of man-hours and reducing the cutting work environment. Improvement, elimination of storage space by continuous running cut and continuous processing, secondary pipe deformation and damage prevention, reduction of transportation costs, and continuous processing of raw material from thin-walled pipes to finishing secondary processing The aim is to reduce the time of

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a thin-walled tube continuous manufacturing facility for welding a butt portion while forming a metal strip into a tubular shape by a roll forming apparatus. A movable table which is directly connected to the apparatus, and which moves the fixed length cutting apparatus during traveling toward and away from the continuous pipe sent out from the continuous thin-walled pipe manufacturing equipment; and a rotation which advances and retracts on the movable table to be inserted into and removed from the continuous pipe. A pipe cutter with a blade, an annular fixed die corresponding to the rotary blade when cutting a pipe fixed to the movable table, a clamp provided on the pipe cutter for pressing a continuous pipe from the inside to the annular fixed die when cutting the pipe, and provided on the movable table It comprises a clamp for fixing the fixed length tube from the outside from the time of cutting the tube to immediately before taking out the fixed length tube, and a fixed length tube removing / dispensing device provided on the movable table.

Then, (1) when the pipe cutter enters the continuous pipe and the rotary blade corresponds to the annular fixed die, advancement of the movable table and the pipe cutter stops, and (2) the length of the continuous pipe becomes a fixed length. When it reaches and receives a disconnection signal from the fixed length detection device,
The movable table and the pipe cutter start to retreat in synchronization with the speed of the continuous pipe, and a clamp works from inside and outside of the continuous pipe. (3) The rotary blade cuts into the continuous pipe, the pipe cutter rotates and the rotary blade and the rotary blade are fixed in an annular shape. The continuous pipe is sheared from the inside with the die, and (4) the rotary blade retracts, the clamp from the inside of the continuous pipe and the fixed pipe to the annular fixed die is released, and the continuous pipe and the fixed pipe are fixed from the outside. (5) The movable table synchronizes with the speed of the continuous pipe while keeping the fixed-length pipe clamped from the outside. The pipe cutter turns at a speed faster than the movable table and retreats. During this time, the fixed-length tube take-out / discharge device grabs the fixed length tube. (6) When the pipe cutter escapes from the fixed length tube, the fixed length Clamp from outside the tube With released by the clamp returns to the original position, taken out fixed-length tube Blank tube extraction dispenser, (7) the movable block and the pipe cutter turned forward,
The pipe cutter advances at a speed higher than that of the movable table and enters the continuous pipe. (8) While the movable table and the pipe cutter are turned off and stopped at the forward end, and waiting for the next cutting signal, the fixed-size pipe is taken out and discharged. A sequence control circuit of the constant-distance cutting device was set up so that the device pays out the constant-length tube out of the constant-distance cutting device and returns to the original position. The above operations (1) to (8) are repeated. Things.

In addition, the above-mentioned pipe cutter with a rotary blade is
A tubular main body longer than a fixed length tube whose base is cantilevered and rotatably supported by the drive mechanism, a shaft rod supported on the axis of the tubular main body, the front and rear ends of which protrude from the tubular main body, and a guide of the front end of the shaft rod. Body, a clamp disposed behind the guide, which presses the continuous tube from the inside toward the annular fixed die when cutting the tube, and an operating mechanism of the clamp, and one or the same supported immediately after the clamp on the front end of the tubular main body A plurality of rotary blades located on the circumference, and an operating mechanism for cutting the rotary blades into the continuous pipe from the inside, and the drive mechanism portion includes a linear rod for operating the clamp operating mechanism. A cylinder that reciprocates, a rotary cylinder that reciprocates a shaft to operate a rotary blade cutting operation mechanism, and a tubular main body that rotates a rotary blade cut into a continuous pipe in the circumferential direction of the pipe It is obtained by a motor for.

A non-contact type speed meter for continuously measuring the speed of the continuous pipe is provided as a fixed length detecting device for issuing a cutting signal when the length of the continuous pipe reaches a predetermined length, and the speed is calculated from the speed. Each time the length value reaches the fixed length value, a cutting signal is transmitted to the running distance fixed length cutting device.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The concrete structure and operation of a constant-length cutting apparatus for continuous running thin-walled tubes according to the present invention will be described with reference to the drawings. FIG. 1 is a schematic view showing the entire thin-walled tube continuous manufacturing equipment, 1 is an uncoiler, 2 is a thin-walled tube continuous forming device such as roll forming, 3 is a seam welding device such as TIG welding, and 4 is a transfer device such as a crawler type feeder. Reference numeral 5 is a fixed-length detecting device, and reference numeral 6 is a fixed-length cutting device during running.

A coil material c of a strip of stainless steel or the like is supported by the uncoiler 1, unraveled from the uncoiler 1, and supplied by the operation of the transfer device 4. While passing, it is gradually formed into a tubular shape, and then the butt portion is continuously welded by the welding device 3. The completed continuous pipe p is cooled, and reaches a running distance cutting device 6 via the measuring device 5. Standard size detection device 5
Uses a non-contact type speed meter that enables laser Doppler so as not to affect the feed speed of the continuous pipe p, and a cutting command is issued every time the length value calculated from the measured speed becomes a fixed value. Is generated. Transfer device 4
Is arranged so as to grasp and pull the completed continuous pipe p behind the welding device 3. A pedestal 7 for the fixed length pipe P discharged from the cutting device 6 is arranged beside the running distance fixed length cutting device 6.

FIG. 2 is a front view of the running distance cutting device 6. On the base 8, there is a movable base 9 which moves forward and backward toward the continuous pipe p to be sent out. At the end of the movable base 9 on the pipe making facility side, an annular fixed die 10 is installed via a mounting frame 10A so as to surround the continuous pipe p. Reference numeral 11 denotes a continuous pipe support guide fixed to the base 8. The continuous pipe p is cut at the position of the annular fixed die 10. Subsequent to the die 10, when cutting the continuous pipe p, a clamp 12 for holding the cut fixed length pipe P is provided. The clamp 12 is mounted on a table 13 which reciprocates a small distance in the pipe direction with respect to the movable table 9.

The movable base 9 uses a servomotor 14 (see FIGS. 4 and 5) installed on the base 8 as a driving source, and advances and retreats in synchronization with a pipe-forming speed via a transmission mechanism 15 such as a pinion rack. Move. The servo motor 14 may be provided on the movable base 9 side. The clamp 12 is a pliers type (see FIG. 6).
, And is operated by a linear reciprocating cylinder 16.
The small distance reciprocation of the clamp mounting base 13 is operated by a linear reciprocating cylinder 17 provided on the movable base 9.

A pipe cutter 19 with a rotary blade 33 (see FIG. 7) which moves in and out of the continuous pipe p is mounted on the movable base 9 via the base 20. The rotary bladed pipe cutter 19 is driven by a servomotor 21 (see FIGS. 4 and 5) installed on the pipe cutter 19 and moves forward and backward via a transmission mechanism 22 such as a pinion rack. The servo motor 21 may be provided on the movable base 9 side.

The detailed configuration of the pipe cutter 19 with a rotary blade will be described with reference to FIGS. A bearing frame 23 also serving as a mounting frame for a drive mechanism described later is placed on the base 20.
A pair of front and rear 23 is provided (see FIGS. 2, 3, and 4). In this bearing frame 23, a tubular main body 24 longer than the fixed length pipe P forming the main part of the pipe cutter 19 with a rotary blade is provided.
Is rotatably supported. That is, the tubular main body 24 is cantilevered so as to protrude toward the pipe forming side.

An axial rod 25 extends along the axis of the tubular main body 24.
Are supported so as to be able to reciprocate a small distance, and the front and rear ends of the shaft 25 protrude from the respective end faces of the tubular main body 24. A bowl-shaped guide 26 is provided at the front end of the shaft 25 to guide the pipe cutter 19 with the rotary blade when the pipe cutter 19 is inserted into or removed from the continuous pipe p. Behind the guide body 26, a clamp 27 for pressing the continuous pipe p from the inside toward the annular fixed die 10 at the time of cutting the pipe is provided.

The clamps 27 are made of seesaw-shaped levers, and are arranged in plural (at least three are allowed) at equal intervals on the circumference in a direction parallel to the shaft 25 and supported by the shaft 25. It is mounted on an annular member 28 which does not move in the axial direction but moves in the circumferential direction. The annular member 28
Is supported by the shaft 25 via a member 30 provided at the end of a pair of support bars 29 (see FIG. 7) projecting from the front end surface of the tubular main body 24 through the center of the shaft 25.

The tightening linear reciprocating cam 31 and the returning linear reciprocating cam 32 commonly acting on the end of the force point of each clamp 27.
Are enclosed by a bowl-shaped guide 26 and are mounted on the shaft 25 together with the bowl-shaped guide 26 so as not to move in the axial direction but to move in the circumferential direction.

Immediately after the clamp 27, a plurality (two in the illustrated example) of rotary blades 33 are arranged at equal intervals on the same circumference. The number of the rotary blades 33 may be one. Tubular body 24
Of the annular member 28 protruding from the front end face of the
The lever 34 is supported around an axis (see FIG. 7),
The rotary blade 33 has a shaft 35 supported on the free end of the lever 34.
Attached to the end of the A lever 36 is attached to the shaft rod 25 via a key or a spline 37 so as to be integrally rotatable and relatively movable in the axial direction, and the free ends of the levers 34 and 36 are connected by a link 38.

Reference numeral 39 denotes a coupling provided in the tubular main body 24 in the middle of the shaft 25, for convenience in structure and processing, and for clamping and cutting at the shaft end, and a shaft driving mechanism (described later). Of the linear reciprocating cylinder 40, rotary cylinder 41, motor 44, etc.) through the shaft 25 to prevent heat from being transmitted. Between the protruding base end of the shaft 25 and the bearing frame 23, the shaft 25
And a rotary cylinder 41 such as, for example, a vane-type oscillating motor for reciprocating the shaft 25 between the shaft 25 and the tubular main body 24. The rotating body 4 of the rotary cylinder 41
The shaft 2 and the shaft 25 are connected via a key or a spline 43. A belt 47 is wound around a pulley 45 of a motor 44 mounted on the bearing frame 23 and a pulley 46 formed on the outer peripheral surface of the tubular main body 24.

The rotary blade 3 with respect to the free end of the lever 34
The mounting structure of No. 3 will be described. Lock nuts 49 and 5 are attached to male threads 48 formed on the mounting side of the rotary blade mounting shaft 35.
0 is screwed in, and the rotary blade 33 is fitted into the male screw 48.
Subsequently, a positioning washer 51 for positioning and holding the blade 33 with respect to the annular fixed die 10 is applied to the end face of the mounting shaft 35, and the washer 51 is fixed by the presser screw 18 that has passed through the washer 51 and screwed into the shaft end face. . The clearance between the cutting edge of the rotary blade 33 and the annular fixed die 10 gradually changes due to the polishing of the cutting edge.
By adjusting the positions of the nuts 49 and 50 so as to hit 1 and locking the nuts 49 and 50 at that position, the clearance can always be maintained at an appropriate value.

As shown in FIGS. 2, 4, and 5, a fixed-length tube take-out and discharge device 53 is provided on the movable base 9 via a portal-shaped machine frame 52 so as to straddle the pipe cutter 19 with a rotary blade. Have been. The fixed-length tube take-out and discharge device 53 is a fixed-length tube P
Has a pair of clamps 54 for grasping. The opening and closing operation of the clamp 54 is performed by a linear reciprocating cylinder 55. A linear reciprocating cylinder 56 for raising and lowering the clamp 54 and a chain or belt transmission 57 for reciprocating the clamp 54 between the take-out position and the pay-out position when the clamp 54 is in the up state are provided. The chain or belt transmission 57 may be a linear reciprocating cylinder using hydraulic pressure or the like. A pedestal 7 that functions as a gently inclined shooter is provided below the fixed-length tube payout position.

A switch for turning on / off and forward / reverse the servomotor 14 for moving the movable table forward and backward, and the servomotor 21 for moving and retracting the pipe cutter with a rotary blade, an on / off switch for the motor 44 for rotating the tubular main body 24 of the pipe cutter, and a driving motor for the transmission 57 It has a switch for turning on and off.

The linear reciprocating cylinders 16 and 55 for opening and closing the clamps 12 and 54, the linear reciprocating cylinder 56 for raising and lowering the clamp 54, the linear reciprocating cylinder 17 for driving the reciprocating table 13 for a short distance, and the shaft of the pipe cutter. Rod 25
And a solenoid valve for controlling the hydraulic pressure for each cylinder such as a rotary cylinder 41 for reciprocatingly rotating the shaft 25.
Each cylinder communicates with one common hydraulic unit. Then, a sequence control circuit connecting the above switches and the switches of the respective solenoid valves is assembled so that the automatic operations described below are performed in order.

A series of automatic operations of the constant distance cutting device according to the present invention will be described with reference to the structures and operations of FIGS. 2 to 9 and a time chart of FIG. The movable table 9 and the pipe cutter 19 with a rotary blade integrally advance toward the continuous pipe p which is formed and sent out. Continuous pipe p
Continues to move.

(1) When the pipe cutter 19 enters the continuous pipe p and the rotary blade 33 reaches a position corresponding to the cutting with respect to the annular fixed die 10, the position is detected by the limit switch, and the motors 14 and 21 are stopped. The advance of the movable base 9 and the pipe cutter 19 with the rotary blade is stopped, and the cutting stand signal is awaited.

(2) When the length of the continuous pipe p reaches a fixed length, the fixed length detecting device 5 generates a cutting signal, which is received by the movable base advance / retreat servomotor 14 to start reverse rotation, and the movable base 9 is continuously operated. It begins to retreat in synchronization with the speed of tube p. Immediately after the start of the retreat of the movable base 9, the clamps 27 and 12 simultaneously work inside and outside the pipe p. As shown in FIG. 7, the cams 31 and 32 move leftward in FIG. 7 via the shaft 25 and act on the power point side of the clamp 27 by the operation of the cylinder 40 operated by the cutting signal as shown in FIG. I do. Then, the action point side of the clamp 27 is raised, and the pipe p is pressed against the fixed die 10 from the inner surface. At the same time, the outer clamp 12 closes and grips the pipe p by the action of another cylinder 16 activated by the cutting signal, as shown in FIGS.

(3) When the pipe p is fixed from inside and outside by the clamps 27 and 12, the lever 36 swings through the shaft 25 by the operation of the rotary cylinder 41 as shown in FIGS. The rotary blade side end of the rotary blade support lever 34 is pushed outward as shown in FIG. 9, and the rotary blade 33 cuts into the continuous pipe p. Subsequently, the motor 44 rotates, and the tubular main body 24 interlocked via the pulley 45, the belt 47, and the pulley 46 has a fixed angle with the rotary blade 33 cut into the continuous pipe p (in the case of the figure, the rotary blade 33 is (Since it is two, it rotates by half a turn), and the continuous pipe p is cut from the inside by the rotary blade 33 and the annular fixed die 10 to obtain a fixed length pipe P.

(4) When the rotational cutting is completed, the clamp 12
Momentarily retracts with respect to the movable base 9 while holding the fixed length tube P, pulls the fixed length tube P away from the continuous tube p by a small distance, and at the same time the rotary blade 33 retracts due to the reverse rotation of the rotary cylinder 41, the cylinder 40 operates. As a result, the cams 31 and 32 move rightward in the figure, and the clamping action of the clamp 27 from the inside of the continuous pipe p to the annular fixed die is released. During the period from the start of the synchronous retreat of the movable base 9 (the above item (2)) to the time point when the clamp is released, a forward load is applied to the pipe cutter 19 in order to clamp the continuous pipe p and hold the cutting position. That is, the pipe cutter driving motor 21 is kept rotating forward.

(5) The movable table 9 clamps the fixed length tube P to the clamp 1
While holding at 2, the pipe cutter driving motor 21 continues to retreat in synchronism with the pipe forming speed of the continuous pipe p. The pipe cutter 19 starts moving backward at a speed higher than that of the movable base 9. At the same time, the clamp 54 is lowered by the operation of the cylinder 56 and the cylinder 55 of the fixed length tube take-out and discharge device 53, and the fixed length tube P is gripped.

(6) As shown in FIG. 3, when the pipe cutter 19 comes out of the standard length tube P, or immediately before the pipe cutter 19 comes out, the clamp 12 from outside the standard length tube P is released, and the clamp 12 is slightly reduced. After moving forward by a distance and returning to the original position, the clamp 54 of the fixed-length tube removing / dispensing device 53 rises and removes the fixed-length tube P.

(7) When the fixed length tube P is taken out, the movable table 9
And the pipe cutter 19 turns forward, and the pipe cutter 1
9 advances at a higher speed than the movable base 9 and enters the continuous pipe p. Pipe cutter driving motor 21 near the forward end
Rotates at a reduced speed.

(8) When the movable table 9 and the pipe cutter 19 reach the forward end (the same time as in (1) above in which the rotary blade 33 corresponds to the annular fixed die 10), the movable table 9 and the pipe cutter 19 stop. . Then, while waiting for the next cutting signal, the fixed-length tube removing / dispensing device 53 discharges the constant-length tube P to the outside of the traveling fixed-length cutting device 6 and returns to the original position. That is, the clamp 54 grasping the fixed length tube P moves to the dispensing position by the operation of the transmission 57 and the cylinder 56 and moves down, the cylinder 55 is operated to open the clamp 54, and the fixed length tube P Lower on 7. The clamp 54 that has released the fixed length tube P immediately rises by the operation of the cylinder 56,
Further, the transmission 57 returns to the position above the take-out position by the operation of the transmission 57. The series of operations (1) to (8) are repeatedly and automatically operated. As described above, the applicable range of the apparatus of the present invention is a thin pipe having a thickness of 0.4 to 1.0 mm and a diameter of 60 mm or more. Specifically, a stainless steel pipe having a thickness of 0.4 mm and a diameter of 110 mm is used. Was effective.

[0034]

As described above, the continuous-distance cutting device in the thin-walled tube continuous manufacturing equipment of the present invention has the above-mentioned configuration. It is small and light, and can cut with high precision because it does not add resistance to the pipe making process. There is no need for trimming, reducing the man-hour required to obtain a fixed length tube and improving the cutting work environment. Can be. Further, not giving resistance to the pipe forming step has an advantage that a variation in a pipe forming speed is eliminated and a hole is not generated in a welded portion. And after cutting the fixed length between runs,
Since the standard length tube can be immediately transferred to secondary processing,
Elimination of storage space for fixed length tubes, accompanying deformation of fixed length tubes
This has the effect of preventing damage, reducing transportation costs, and shortening the time required for all processes from raw material through continuous production of thin-walled tubes to completion of secondary processing.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a thin-walled tube continuous production facility including a constant-distance cutting device according to the present invention.

FIG. 2 is a front view of the constant distance cutting device in a state where a pipe cutter with a rotary blade enters a continuous pipe.

FIG. 3 is a front view of a running-length cutting apparatus in a state in which a pipe cutter with a rotary blade comes out of a continuous pipe and a fixed-length pipe is taken out.

FIG. 4 is a plan view of the constant distance cutting device in a state where a pipe cutter with a rotary blade has entered a continuous pipe (FIG. 2).

FIG. 5 is a left side view of the running distance cutting device.

FIG. 6 is a right side view of a fixed length tube clamping mechanism.

FIG. 7 is a longitudinal sectional view of a pipe cutter with a rotary blade and an annular fixed die.

FIG. 8 is a cross-sectional view of the rotary blade portion (state before cutting).

FIG. 9 is a cross-sectional view of the rotary blade portion (in a cut state).

FIG. 10 is a time chart for explaining the automatic operation of the running distance cutting device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 Uncoiler 2 Continuous thin-wall tube forming device 3 Seam welding device 4 Transfer device 5 Constant-size detecting device (non-contact type speedometer) 6 Constant-running cutting device 9 Movable table 10 Annular fixed die 19 Pipe cutter 24 26 Guide Body 27 Clamp Acting on Inside of Pipe 33 Rotating Blade 40 Cylinder for Reciprocating Shaft Linearly 41 Rotary Cylinder for Reciprocating Shaft Rod 44 Motor for Rotating Tubular Main Body 53 Standard-Pipe Removal and Dispensing Device 54 Clamps acting on the outside p Continuous tube P Fixed length tube

Claims (10)

[Claims] An apparatus for continuously cutting a thin-walled tube, which welds a butt portion while forming a metal strip into a tubular shape by a roll forming device, is directly connected to a continuous-running constant-length cutting device. A movable table which advances and retreats toward a continuous pipe sent out from a continuous manufacturing facility, a pipe cutter with a rotary blade which advances and retreats on the movable table and is inserted into and removed from the continuous pipe; and a rotary blade which is fixed to the movable table when cutting a pipe. An annular fixed die corresponding to, a clamp provided on the pipe cutter to press the continuous pipe against the annular fixed die from the inside when cutting the pipe, and a fixed-length pipe outside from the time of cutting the pipe provided on the movable base to just before taking out the fixed-length pipe (1) When the pipe cutter enters the continuous pipe and the rotary blade corresponds to the annular fixed die, the movable table and the pipe cutter are fixed. (2) When the length of the continuous tube reaches a fixed length and a cutting signal is received from the fixed length detecting device, the movable table and the pipe cutter start retreating in synchronization with the speed of the continuous tube. (3) The rotating blade cuts into the continuous tube, the pipe cutter rotates, and the continuous blade is sheared from the inside by the rotating blade and the annular fixed die. The clamp fixed from the outside retreats instantaneously with respect to the movable table, pulls the fixed length tube from the continuous tube a small distance, the rotating blade retracts, and the clamp from the inside of the continuous tube to the annular fixed die is released,
(5) The movable table continues to retreat in synchronization with the speed of the continuous pipe while the fixed-length tube is fixed from outside by a clamp. (6) When the pipe take-out / discharge device grasps the fixed length tube and the pipe cutter escapes from the fixed length tube, the clamp from outside the fixed length tube is released, and the clamp returns to the original position.
(7) The movable table and the pipe cutter turn forward, the pipe cutter advances at a higher speed than the movable table, and enters the continuous pipe. (8)
While stopping at the forward end from the return of the movable table and the pipe cutter, and waiting for the next cutting signal, the fixed-length tube removing / dispensing device dispenses the constant-length tube out of the traveling constant-length cutting device and returns to the original position. And a sequence cutting circuit in a thin-walled tube continuous manufacturing facility, wherein a sequence control circuit is configured to repeat the above operations (1) to (8). 2. A continuous-distance cutting device is connected directly to a thin-walled tube continuous production facility for welding a butt portion while forming a metal strip into a tubular shape by a roll forming device. A movable table which advances and retreats toward a continuous pipe sent out from a continuous manufacturing facility, a pipe cutter with a rotary blade which advances and retreats on the movable table and is inserted into and removed from the continuous pipe; and a rotary blade which is fixed to the movable table when cutting a pipe. An annular fixed die corresponding to the above, a clamp provided on the movable table, from the time of cutting the pipe to just before taking out the fixed length tube, and a clamp for fixing the fixed length tube from the outside, and a fixed length tube removing and dispensing device provided on the movable table, A pipe cutter with a rotary blade has a tubular main body longer than a fixed-length tube whose base is supported by a drive mechanism, and is cantilevered and rotatably supported, and a shaft rod whose front and rear ends supported by an axis of the tubular main body protrude from the tubular main body. And in front of the shaft A guide, a clamp disposed behind the guide, which presses the continuous pipe against the annular fixed die from the inside when cutting the pipe, an operating mechanism of the clamp, and one or more of the clamps supported on the front end of the tubular main body immediately after the clamp. It consists of a plurality of rotary blades located on the same circumference, and an operating mechanism for cutting the rotary blades from the inside into the continuous pipe.The drive mechanism has a shaft rod for operating the clamp operating mechanism. A cylinder for linearly reciprocating, a rotary cylinder for reciprocating the shaft for operating the rotary blade cutting operation mechanism, and a tubular for rotating the rotary blade cut into the continuous pipe in the circumferential direction of the pipe. (1) When the pipe cutter enters the continuous pipe and the rotary blade corresponds to the annular fixed die, the movable table and the pipe cutter stop moving, and (2) the continuous pipe When the length reaches the fixed length and the cutting signal is received from the fixed length detecting device, the movable table and the pipe cutter start retreating in synchronization with the speed of the continuous pipe, and the clamp works from inside and outside of the pipe, and (3) rotation The blade cuts into the continuous pipe, the pipe cutter rotates, shears the continuous pipe from the inside with the rotating blade and the annular fixed die, and (4) the clamp that fixes the fixed-length pipe from outside retracts instantaneously with respect to the movable table. To separate the fixed length tube from the continuous tube a small distance,
The rotary blade retracts, and the clamp from the inside of the continuous tube to the annular fixed die is released. (5) The movable table keeps retracting in synchronization with the speed of the continuous tube while the fixed length tube is clamped from outside. However, the pipe cutter turns faster than the movable table and retreats, and during this time, the fixed-length tube take-out and ejection device grabs the fixed length tube. (6) When the pipe cutter escapes from the fixed length tube, Is released and the clamp returns to the original position, and the constant-length tube removing / dispensing device removes the constant-length tube. (7) The movable table and the pipe cutter turn forward, and the pipe cutter is moved at a higher speed than the movable table. (8) While the movable table and the pipe cutter are turned back and stopped at the forward end and awaiting the next cutting signal, the constant-length tube unloading and dispensing device sets the constant-length tube for the running distance. Dispensing outside the cutting device To return to the original position, or more (1) to
A continuous-distance cutting device in a thin-walled tube continuous manufacturing facility, wherein a sequence control circuit is configured to repeat the operation of (8). 3. A non-contact type speed meter for continuously measuring the speed of a continuous pipe sent out from a thin-walled pipe continuous manufacturing facility and heading to a constant length cutting device, and a length value calculated from the speed is provided. 3. The cutting device according to claim 1, wherein a cutting signal is transmitted to the cutting device at a time when the constant value is reached. 4. The movable base is a servomotor provided on the base side or the movable base side, and the pipe cutter with a rotary blade is
3. The constant-distance cutting device in a thin-walled tube continuous manufacturing facility according to claim 1, wherein the device is driven forward and backward by a servomotor provided on the pipe cutter side or the movable table side. 5. The thin wall according to claim 1, wherein the mechanism for immediately retracting the fixed-length tube fixing clamp with respect to the movable table immediately after shearing is a linear reciprocating cylinder installed on the movable table. A constant-length cutting device for continuous running in a continuous pipe manufacturing facility. 6. A fixed-pipe fixing clamp on a movable base and a clamp of a fixed-pipe take-out and discharge device are each configured as a pliers, and each of them is opened and closed by a linear reciprocating cylinder. 3. A constant-length cutting device in a thin-walled tube continuous production facility according to claim 1 or 2. 7. A see-saw lever provided at a plurality of positions on a circumference according to claim 2, wherein the clamp provided on the pipe cutter with a rotary blade is a see-saw lever, and the clamp operating mechanism is a linear reciprocating mechanism acting on an end of the see-saw lever. A constant-distance cutting device in a thin-walled tube continuous manufacturing facility, which is a moving cam. 8. The rotary blade cutting operation mechanism according to claim 2, wherein one end of the rotary blade cutting operation mechanism is attached to a front end of the tubular main body by a support shaft, and a lever having a free end supporting the rotary blade shaft, a shaft rod, and a shaft rod. A continuous-distance cutting device for thin-walled tube continuous production equipment, comprising: a lever rotatably and axially movable relative to each other; and a link connecting the free ends of both levers. 9. A fixed-length tube dispensing and dispensing device includes a mechanism for raising and lowering a clamp at each of a dispensing and dispensing position, and a mechanism for reciprocating the clamp between the dispensing position and the dispensing position in the raised state. 3. The constant-running-distance cutting device in the thin-walled tube continuous production facility according to claim 1 or 2, wherein: 10. The constant distance during travel in a thin-walled tube continuous manufacturing facility according to claim 9, wherein the lifting mechanism of the clamp is a hydraulic cylinder, and the reciprocating mechanism of the clamp is a chain or a belt transmission device or a hydraulic cylinder. Cutting device.