JP2008062326A - Band saw type pipe cutter and pipe cutting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a band saw type pipe cutter, efficiently cutting a plurality of pipes at one time. <P>SOLUTION: The band saw type pipe cutter 1 for half-splitting a pipe along the longitudinal direction includes: a band saw 4 stretched between pulleys 3 disposed on a work table to cut in the direction orthogonal to the longitudinal direction of the work table 2; an inlet guide device 6 disposed at the back of the band saw in the pipe advancing direction to guide the pipe to a cutting blade of the band saw parallel to the work table; a feeder 7 in which a feed pedestal for fixing a support rod is provided movably in parallel along the work table of the cutter; and a vibration restraining device disposed at the back of the band saw 4 in the pipe advancing and retreating direction (a) to press the pipe 5 cut by the band saw 4 and moving parallel to the work table 2 toward the work table 2 side by a guide member. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a band saw type pipe cutting apparatus that divides a metal pipe (hereinafter referred to as a pipe) having a relatively small diameter with a band saw with high accuracy in the longitudinal direction, and a pipe cutting method using the same. .

  Conventionally, when removing old equipment at a nuclear power plant with equipment renewal, it is necessary to process a large amount of radioactive waste. These radioactive wastes are measured and monitored (surveyed) for contamination by a measuring device such as a Geiger counter, and processed as necessary according to the results. In such treatment, waste with a high contamination level is finely divided and then put into a special tank called a cask and stored in a stable storage of the formation (called formation treatment). Therefore, the processing cost is very high.

  On the other hand, wastes with a low contamination level are subjected to cleaning processing such as decontamination and are processed as unnecessary articles at low cost. A heat exchanger (condenser, feed water heater, etc.) in a nuclear power plant is generally a structure in which a large number of pipes are arranged in a container, and each pipe has a quantity of several tens of tons.

  When removing the heat exchanger, first, the container and the pipe which is a small-diameter metal pipe are separated, and the contamination level is measured. In this case, since the pipe is a long pipe having a small diameter, a measuring device such as a Geiger counter cannot check the internal contamination state. Therefore, regardless of the presence or absence of contamination levels, all of the piping is packed in a cask that is a dedicated tank and is subjected to geological treatment. For this reason, the cost of processing the piping increases.

Therefore, in order to make it possible to easily measure the contamination level by halving the pipe, there is a method of heat-cutting the pipe (conventional example 1). Moreover, an apparatus (conventional example 2) that continuously cuts the pipe and divides it into half is proposed and known (see Patent Document 1). This consists of a pair of cutting discs consisting of a pair of left and right disc-shaped tip saws having a large number of incisors in the circumferential direction, and a cutting guide rod arranged concentrically with the piping to be cut, and the piping is continuously arranged. It cuts in half.
Japanese Patent Laid-Open No. 2005-7483

  However, in the conventional pipe half-cutting device, for example, in the above-described conventional example 1, dust that is activated by metal or radioactive material that has been activated at the time of interruption is scattered in the air, and the operator sucks it and is exposed to exposure. In addition, the radioactive material dissolves in the pipe, and the decontamination work becomes difficult. Moreover, since the disk-shaped chip saw which has an incisor is used like the said prior art example 2, it is necessary to collect | recover the chips which generate | occur | produce at the time of the cutting | disconnection using a vacuum cleaner, and the structure of the whole cutting device has the structure. It becomes complicated and its production cost increases. The pipe half-cutting device according to the present invention has been proposed in order to solve such a problem.

  The gist of the band saw type pipe cutting apparatus according to the present invention for solving the above-mentioned problems and achieving the object is to provide a cutting apparatus that divides a pipe in half along its longitudinal direction. A band saw laid between pulleys so as to cut in a direction perpendicular to the direction, and an inlet guide device disposed behind the band saw in the pipe traveling direction and leading the pipe parallel to the work table to the cutting blade of the band saw And one end of the pipe is inserted into the inlet guide device, and the other end of the pipe is supported by inserting a support bar into the internal space of the other end, and the feed base for fixing the support bar is cut. A feed device that is provided in parallel and freely movable along the work table of the device to advance the pipe toward the inlet guide device; Arranged behind the Desault is to consist of a vibration suppression device for pressing toward the work table side guide member piping which moves parallel to the working table is cut with a band saw.

The inlet guide device has a rotatable roller for sandwiching the pipe up and down, and one of the rollers can be moved up and down by a lifting device in the vertical direction to cope with a change in the thickness of the pipe;
The vibration suppressing device is provided with a rotatable roller mounted on a pipe cut in the middle of a lever swinging around a fulcrum provided in a part of the pipe cutting device, and the lever moves along the lever. An adjustment weight is provided that is flexible and varies the load on the pipe by the roller by changing the distance from the fulcrum;
An oil refueling device and an oil removing device are provided before and after the traveling direction of the cutting blade of the cutting action portion between the pulleys in the band saw;
The inlet guide device has a pressing force that is variable by pressing means when sandwiching one of the up and down rollers;
A pair of optical sensors are provided with the cutting blade of the band saw sandwiched in the thickness direction of the blade, and an optical signal is transmitted between adjacent cutting blades;
The traveling direction of the cutting blade in the band saw is set at an angle slightly inclined from the direction orthogonal to the traveling direction of the pipe to be cut;
The traveling direction of the cutting blade in the band saw is returned by the band saw moving means in a direction perpendicular to the traveling direction of the pipe to be cut during the cutting of the pipe;
One end of the pipe is placed behind the inlet guide device in the pipe traveling direction, and the pipe is temporarily placed in parallel with the work table together with the support rod of the feeder, and is slidable along the pipe traveling direction on the work table. And a temporary pipe placement device that is pushed against a part of the feeding device and moved toward the inlet guide device so as not to hinder the advancement of the feeding device that is disposed in the forward direction toward the inlet guide device. Is provided;
Is included.

  The gist of the pipe cutting method according to the present invention that solves the above problems is that the band saw type pipe cutting device according to the present invention has a pipe feeding speed and a cutting speed of a cutting blade in the band saw that are to be cut. By inputting each data of the material, external dimensions and wall thickness into the control device, the control software program built in the control device automatically sets the optimum conditions and cuts the piping. is there.

According to the band saw type pipe cutting device of the present invention, a plurality of pipes can be cut at once with a band saw, and the work efficiency is improved. In addition, since the cutting operation is performed over the diameter direction of the pipe in the cutting action by the band saw, the circular pipe is not twisted by rotation or the like during the cutting, and the cutting line is linear and the pipe is divided into two with high accuracy. can do.
The roller that sandwiches the pipe of the inlet guide device can be moved up and down, and can respond to changes in the thickness of this pipe. There is no need to provide a cutting device, and the manufacturing cost of the cutting device is reduced.

When suppressing the vibration by pressing the cut pipe with the vibration suppression device, the load can be changed appropriately with the movable adjustment weight provided on the swinging lever, so the vibration of the pipe can be efficiently controlled. It can be suppressed and the adjustment work becomes easy.
The oil supply device provided in the band saw and the oil removing device maintain the sharpness of the cutting blade of the band saw and reduce the running cost of the cutting blade.

In the inlet guide device, the pressing force when the one freely movable roller is sandwiched is made variable by the pressing means, so that the vibration of the pipe during cutting can be suppressed to a certain level.
Since a pair of optical sensors are provided with the cutting blade of the band saw sandwiched in the thickness direction of the blade, and an optical signal is transmitted between adjacent cutting blades, it can be determined whether or not the cutting blade has spilled. It becomes like this. Thereby, in a band saw, the exchange time of a cutting blade can be known easily.

The cutting direction of the cutting blade in the band saw is set at an angle slightly inclined from the direction orthogonal to the traveling direction of the pipe to be cut. It can be set so that the cutting resistance gradually increases without applying a load of resistance to the cutting blade, and an excessive force is not applied to the band saw. Furthermore, cutting noise can be suppressed at the start of cutting.
In addition, since the temporary pipe placement device is provided behind the inlet guide device in the pipe traveling direction, it is convenient when placing the pipe on the work table, and a plurality of pipes can be aligned.

  According to the pipe cutting method of the present invention, the pipe feed speed and the cutting speed of the cutting blade in the band saw are automatically set to the optimum conditions by the control software program. Can be cut off.

  The band saw type pipe cutting device 1 according to the present invention (hereinafter simply referred to as the cutting device 1) is, as shown in FIGS. 1 to 2, for example, piping used in a heat exchanger of a nuclear reactor (as an example, an external This is a cutting device that accurately halves 5 in the longitudinal direction (diameter of about 16 mm, thickness of about 1.2 mm, and length of about 1.5 m).

  The cutting device 1 includes a rectangular and elongated metal substantially horizontal work table 2 and a second work table 2a, which are fixedly supported on the frame 1a of the device 1, and the tables 2 and 2a thereon. As shown in FIG. 3, there is a band saw 4 installed between the pulleys 3 and 3 so as to cut in a short direction perpendicular to the longitudinal direction a.

  As shown in FIGS. 1 and 4, the band saw 4 is disposed on the rear side in the pipe advancing / retreating direction (the same direction as the longitudinal direction) a, and the band saw 4 is parallel to the work table 2. There is an inlet guide device 6 that leads to the cutting blade and suppresses vibration of the pipe 5.

  The inlet guide device 6 is a device that presses the pipe 5 so that it does not vibrate when it is cut. In this embodiment, as shown in FIGS. 1 and 5, a rotary roller (using a radial bearing) 6a is fixed on the lower side, and the same shape of the rotary roller 6b is set on the upper side with respect to the guide frame 6d. In this structure, the rotary roller 6b is pressed down by sandwiching the pipe 5 with an air cylinder 6c.

  Further, the pressing force for pressing the rotating roller 6b is made of an elastic means such as an air cylinder or a coil spring so that the pressing force can be varied. Therefore, in cutting the pipe 5, the pushing force of the rotating roller 6b can be adjusted manually or automatically so as to be in the best state for preventing the vibration of the pipe 5.

  As shown in FIGS. 6 to 9, the inlet guide device 6 is inserted with the tip 5a of the pipe 5, and the other end 5b of the pipe 5 is inserted into the internal space of the other end 5b in the shape of a spire and elongated rod. A support base 7b for supporting the support bar 7a by inserting the tip 7b of the support bar 7a and fixing the support bar 7a by one or more is provided along the work table 2 of the cutting device 1 so as to be movable in parallel. There is a feed device 7 that advances 5 toward the inlet guide device 6.

  As shown in FIGS. 7 to 8, the support rod 7a is an elongated metal rod, and a slit 7c is provided in the tip end portion 7b having a sharp point on the inner side from the tip end surface. The cutting blade 4a of the band saw 4 enters the slit 7c. As shown in FIG. 8 (B), when the front end portion 7b is inserted into the internal space of the rear end portion 5b of the pipe 5, a position further on the rear side than the rear end position of the rear end portion 5b of the pipe 5 is concerned. The slit 7c is cut horizontally at the center so as to reach. Thereby, the cutting blade of the band saw 4 can cut | disconnect the piping 5 to the last. The outer dimension of the support bar 7 a is equal to the outer dimension of the pipe 5. In addition, the outer dimension of the tip 7 b that is one step smaller than the outer dimension of the support bar 7 a is substantially the same as the inner diameter of the pipe 5.

  Further, for example, as shown in FIG. 9, the support rod 7 a has a rectangular attachment protrusion formed in the lower part thereof, and is formed of a rectangular and metal feed base 7 d with about 3 to 5 pieces. The mounting projection is fitted into the mounting recess and fixed with a bolt. The feed base 7d is fitted to a guide rail 7f laid on the work table 2 side along the longitudinal direction a, and is slidably guided by the guide rail 7f. The feed base 7d is provided so as to be movable in parallel to the work table 2 by an example chain driving device 7e shown in FIG.

  By the chain drive device 7e, the feed base 7d is advanced toward the inlet guide device 6 along the guide rail 7f, or reversely moved back to the original position. The chain drive device 7e moves the feed base 7d back and forth at a speed automatically adjusted by a drive motor connected to a control device (not shown). In addition to the moving method using a chain, a known driving method such as belt driving or sliding with a ball screw rod can be applied as appropriate.

  Next, as shown in FIG. 11, the pipe 5 which is arranged in front of the band saw 4 in the pipe advance / retreat direction a and which is cut by the band saw 4 and moves in parallel with the work table 2 is connected to the work table 2 by the guide member 8a. There is a vibration suppression device 8 for pressing toward the upper surface of the.

  The guide member 8a is a part of the pipe cutting device 1, for example, a pipe 5c cut in the middle of a pair of levers 8c and 8c that swing around a fulcrum 8b provided on the side of the work table 2. , 5d is provided with a rotatable drum-shaped roller 8a.

  An adjustment weight 8d is provided on the upper end side of the pair of levers 8c, 8c. The adjustment weight 8d is movable along the lever 8c by, for example, a long hole 8e provided in a part of the lever 8c, and the pipe L by the roller 8a is changed by changing the distance L from the fulcrum 8b. The load for 5 is variable. The illustrated embodiment is merely an example, and a variable load may be applied to the roller 8a by another known method, for example, an elastic means such as a spring or a method of adding a weight. It can be done.

  Further, as shown in FIGS. 10 and 12, the distal end portion 5 a of the pipe 5 is placed on the rear side in the pipe advancing / retreating direction a of the inlet guide device 6, and the pipe 5 is connected together with the support rod 7 a of the feeding device 7. Temporarily placed parallel to the work table 2 and slidably disposed along the pipe advance / retreat direction a on the work table 2 so as not to prevent the advancement of the feeding device 7 moving forward toward the inlet guide device 6. A temporary pipe placement device 9 that is pressed against a part of the feeding device 7 and is moved toward the inlet guide device 6 is provided.

  As shown in FIG. 4 and FIG. 10 (B), this temporary pipe placement device 9 is a flat plate in which a necessary number of semicircular recesses 9a for placing a plurality of pipes 5 are formed on one end side edge. -Shaped placement bar 9b, a support member 9c for supporting the placement bar 9b, a slide bar 9d for supporting the support member 9c in a movable manner parallel to the work table 2, and fixing the slide bar 9d In this way, the support column 9e is erected from the work table 2 by bolts.

  The pipe temporary placement device 9 is for hooking and placing the distal end portion 5a of the pipe 5 when the plurality of pipes 5 are horizontally placed on the work table 2 at the start of work. . The reason for moving toward the inlet guide device 6 is that the tapered portion 7g between the distal end portion and the base portion of the support bar 7a of the feeding device 7 is pressed against the concave portion 9a of the placement bar 9b. In addition, as shown in FIG. 4, along with the movement of the temporary pipe placement device 9, the rear end of the inlet guide device 6 is brought into contact with the front end surface of the placement bar 9b to prevent overshoot. The stopper 10 is formed in an L shape and is fixed on the work table 2 with a bolt.

  Next, as another embodiment of the band saw type pipe cutting device 1, as shown in FIG. 13, an oil refueling device 11a before and after the traveling direction of the cutting blade 4a of the cutting action portion between the pulleys 3 and 3 in the band saw 4 and An oil removing device 11b is provided. Thereby, the sharpness of the cutting blade 4a is maintained long and satisfactorily. Reference numeral 12 denotes a rotatable metal brush that discharges chips from the cutting blade 4a.

  Further, as shown in FIG. 14, a light emitting device 13a and a light receiving device 13b are provided as a pair of optical sensors sandwiching the cutting blade 4a of the band saw 4 in the thickness direction of the blade, and a gap 4b adjacent to the cutting blade 4a is provided. The optical signal is made to pass through. As a result, if the transmission time of light etc. becomes longer than usual, there will be a spilling of the blade.In that case, by alerting with alarm means such as a flashing alarm lamp as an example, the spilling of the cutting blade Immediately knows whether or not. As the optical sensor, a known photodiode, phototransistor, photo IC, solar cell or the like is used.

  Further, as shown in FIGS. 15A and 15B, the traveling direction of the cutting blade 4a in the band saw 4 is from the direction orthogonal to the piping advancing / retreating direction a, which is the traveling direction of the pipe 5 to be cut. The angle θ is set to be slightly inclined. As a result, when starting to cut a plurality of pipes 5, a large load when cutting all the pipes 5 from the beginning is avoided, and the band saw 4 is cut one by one with a light load. The load at the start of cutting gradually increases and smoothly increases, and the load does not increase suddenly.

  Further, when the cutting operation progresses and all of the plurality of pipes 5 are cut, as shown in FIG. 15B, during the cutting of the pipe 5, the traveling direction of the pipe 5 to be cut is reduced. The cutting blade 4a is returned by a band saw moving means (not shown) in a substantially orthogonal direction.

  The band saw moving means is, for example, forcibly pushing one end side of the support base of the band saw 4 with a bolt or the like, or pulling one end side of the support base of the band saw 4 with a coil spring whose tension is adjusted. In this state, the number of pipes 5 to be cut gradually increases from one to two, so that the band saw 4 is automatically rotated around the fulcrum by the pressing force of the pipes 5 and all the pipes 5 are cut. Then, the posture of the band saw 4 may be changed just in the substantially orthogonal direction.

  A method of accurately cutting a plurality of pipes 5 simultaneously using the band saw type pipe cutting device 12 of the present invention configured as described above will be described. A plurality of pipes 5 are set on the work table 2 in the band saw type pipe cutting device 1. As shown in FIG. 1 and FIG. 6, with the feeding device 7 pushed to the rear in the longitudinal direction a to the vicinity of the stopper 13, the tip 5 a of the pipe 5 is placed on the recess 9 a of the temporary placement device 9, and the rear end The part 5b is inserted into the tip of the support bar 7a. At this time, the temporary placement device 9 placement bar 9b is positioned on the most rear side in the longitudinal direction a.

  Next, the feeding speed of the pipe 5 by the feeding device 7 and the cutting speed of the cutting blade 4a in the band saw 4 are set. For this, the data of the material, the external dimensions, and the thickness of the pipe 5 to be cut are input to a control device (not shown). Thereby, the feed speed and the cutting speed are automatically set to the optimum conditions by the control software program incorporated in the control device.

  The drive motor 14 is rotated by the control device, and the pulleys 3 and 3 are rotated via the speed reducer 14a. Thereby, the band saw 4 is rotated at a desired cutting speed. Then, the chain driving device 7e of the feeding device 7 shown in FIG. 7 is driven to advance the set plurality of pipes 5 along the pipe advance / retreat direction a at the same time.

  As shown in FIGS. 1 and 5, each of the pipes 5 is inserted between rotation rollers 6 a and 6 b in the inlet guide device 6. The air cylinder 6c shown in FIG. 1 and FIG. 4 is operated by the control device, the rotating roller 6b is lowered, the piping 5 is sandwiched between the rotating rollers 6a, and a required pressing force is applied to the piping 5. It is.

  The pipe 5 is further advanced along the longitudinal direction a while being pressed by the rotating rollers 6a and 6b in the vertical direction, and as shown in FIG. 3, the tip 5a of the pipe 5 reaches the cutting device. In this embodiment, the band saw 4 moves from right to left in the drawing along the short direction. The pipes 5 are cut into two vertically by the cutting blade 4a of the band saw 4. Since the piping 5 is pushed to the left side without being connected, as shown in FIG. 16, the L-shaped position regulating plate 15 for piping protrudes partly through the through hole of the casing of the cutting device. Is provided.

  As shown in FIGS. 1 and 11, the cut pipe 5 divided into the upper and lower parts by the band saw 4 is advanced to the feeding device 7, and the upper divided body 5c at the tip 5a is suppressed in vibration. It contacts the lower side of the roller 8a of the apparatus 8. Then, the roller 8a is rotated up around the fulcrum 8b of the lever 8c and pushed up.

  The pipe 5 is pressed toward the second work table 2a by the roller 8a mounted thereon, and vibrations by the band saw 4 are suppressed. Further, the pressing amount by the roller 8a is adjusted by the distance from the fulcrum 8b of the adjustment weight 8d provided movably on the lever 8c.

  In this way, when the pipe 5 is cut and the last part of its length reaches the band saw 4, the support rod 7a of the feeding device 7 that has moved along the guide rail 7f as shown in FIG. The tip 7b advances to the band saw 4 portion. Thereby, the placing bar 9b of the temporary placing device 9 is pushed by the tapered portion 7g of the support bar 7a to slide and advance, and the band saw 4 enters the slit 7c of the support bar 7a. Since the depth of the slit 7c is long, the rear end portion 5b of the pipe 5 is cut by the band saw 4 to the position of the last end face.

  The pipe 5 cut to the end is placed in a cut state on the second work table 2a. Thereafter, the feeding device 7 is returned to its original position by the chain driving device 7e. Further, the rotating roller 6b of the inlet guide device 6 is returned upward by the air cylinder 6c. Then, the rotation of the band saw 4 is stopped. The placement bar 9b of the temporary pipe placement device 9 holds the handle 16 (see FIG. 1) provided on the support member 9c and manually returns it to the original position, or partially rotates the chain drive device 7e. Power is transmitted to the original position by an automatic return mechanism.

  In this way, a plurality of pipes 5 are cut at a time and this is repeated, and the pipes 5 etc. used in the heat exchanger of the nuclear reactor are cut with high precision, cleaned and processed as unnecessary items. Is.

1 is an overall perspective view of a band saw type pipe cutting device 1 according to the present invention. It is a side view of the same band saw type pipe cutting device 1. It is a front view which shows the structure of the pulley 3 and the band saw 4 in the same band saw type | formula cutting device 1. FIG. It is a perspective view of the inlet guide device 6 in the same band saw type pipe cutting device 1. They are the front view (A) of the entrance guide device 6, a use state side view (B), and a partially exploded side view (C). It is a whole perspective view of the feeding apparatus 7 in the same band saw type pipe cutting device 1. It is a side view of the feeding device. They are a top view (A) of the feeding device 7, a side view (B) of the support bar 7a, and a partial cross-sectional view (C) of the support bar 7a. It is a longitudinal cross-sectional view which shows the attachment state of the support bar 7a and the feed base 7d, and the fitting state of this feed base 7d and a guide rail. They are the front view (A) of the temporary pipe placement apparatus 9 in the same band saw type pipe cutting device 1, and the front view (B) of the mounting bar 9b. It is a perspective view of the vibration suppression apparatus 8 in the same band saw type pipe cutting device 1. FIG. It is explanatory drawing which shows a mode that the piping temporary placement apparatus 9 is pushed forward by advance of the support bar 7a of the feeder 7 in the use condition of the same band saw type pipe cutting device 1. It is a one part perspective view of the band saw type | formula pipe cutting device 1 which concerns on another Example. It is the top view (A) of the cutting blade 4a of the band saw 4 which concerns on the other Example, and a side view (B). In the band saw type pipe cutting apparatus 1 according to the other embodiment, a schematic plan view (A) showing a state in which the band saw 4 is disposed in an inclined state, and a schematic plan view in a state of returning to the orthogonal direction (short direction) ( B). It is a partially expanded side view which shows a mode that it cut | disconnects to the last of the rear-end part 5b of piping with the band saw type piping cutting device 1 of this invention.

Explanation of symbols

1 Band saw type pipe cutting device,
2 work table, 2a second work table,
3 pulley,
4 Band saw, 4a Cutting blade,
4b gap,
5 Piping, 5a Tip,
5b rear end,
6 Entrance guide device,
6a, 6b rotating roller,
7 Feeder, 7a Support rod,
7b tip, 7c slit,
7d feed base, 7e chain drive,
7f guide rail,
8 Vibration suppression device, 8a Roller (guide member,
8b fulcrum, 8c lever,
9 Pipe temporary placement device, 9a recess,
9b Placement bar, 9c Support member,
9d slide bar, 9e support pillar,
10 stopper,
11a Oil supply device, 11b Oil removal device,
12 brushes,
13a light emitting device, 13b light receiving device,
14 drive motor, 14a reduction gear,
15 Position restriction plate,
16 Handle,
a Piping advance / retreat direction (longitudinal direction).

Claims (10)

In the cutting device that divides the pipe in half along its longitudinal direction,
A band saw laid between pulleys so as to cut on the work table in a direction perpendicular to the longitudinal direction of the work table;
An inlet guide device disposed behind the band saw in the pipe traveling direction to guide the pipe to the cutting blade of the band saw parallel to the work table;
One end portion of the pipe is inserted into the inlet guide device, and the other end portion of the pipe is supported by inserting a support rod into the internal space of the other end portion, and a feed base for fixing the support rod is a cutting device. A feed device provided parallel and freely movable along a work table to advance the pipe toward the inlet guide device;
A vibration suppressing device that is arranged behind the band saw in the pipe traveling direction, and that cuts the pipe and moves parallel to the work table toward the work table with a guide member;
Band saw type pipe cutting device characterized by The inlet guide device has a rotatable roller for sandwiching the pipe up and down, and one of the rollers can be moved up and down by the lifting device in the vertical direction to respond to changes in the thickness of the pipe,
The band saw type pipe cutting device according to claim 1 characterized by things. The vibration suppression device is provided with a rotatable roller mounted on a pipe cut in the middle of a lever swinging around a fulcrum provided in a part of the pipe cutting device, and the lever can be moved along the lever. And an adjustment weight for changing the load on the pipe by the roller by changing the distance from the fulcrum is provided,
The band saw type pipe cutting device according to any one of claims 1 to 2. Before and after the direction of travel of the cutting blade of the cutting action part between the pulleys in the band saw, an oil oil supply device and an oil removal device are provided,
The band saw type pipe cutting device according to any one of claims 1 to 3. In the entrance guide device, the pressing force when sandwiching one up and down roller is variable by the pressing means,
The band saw type pipe cutting device according to any one of claims 1 to 4. A pair of optical sensors are provided with the cutting blade of the band saw sandwiched in the thickness direction of the blade, and an optical signal is transmitted between adjacent cutting blades,
The band saw type pipe cutting device according to any one of claims 1 to 5. The traveling direction of the cutting blade in the band saw is set at an angle slightly inclined from the direction orthogonal to the traveling direction of the pipe to be cut,
The band saw type pipe cutting device according to any one of claims 1 to 6. The traveling direction of the cutting blade in the band saw is returned by the band saw moving means in a direction perpendicular to the traveling direction of the pipe to be cut during the cutting of the pipe.
The band saw type pipe cutting device according to claim 7 characterized by things. One end of the pipe is placed behind the inlet guide device in the pipe traveling direction, and the pipe is temporarily placed in parallel with the work table together with the support rod of the feeding device, and is slidable along the pipe traveling direction on the work table. There is a temporary pipe placement device that is disposed and pressed against a part of the feed device and moved toward the entrance guide device so as not to prevent the advance of the feed device that moves forward toward the entrance guide device. Is provided,
The band saw type pipe cutting device according to any one of claims 1 to 8. By the band saw type pipe cutting device according to any one of claims 1 to 9, the feed speed of the pipe by the feed device and the cutting speed of the cutting blade in the band saw control each data of the material, the external dimensions and the thickness of the pipe to be cut. By inputting into the device, the control software program built into the control device automatically sets the optimum conditions and the pipe is cut.
Pipe cutting method characterized by the above.

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