JP6047695B2 - Pipe cutting machine - Google Patents

Description

  The present invention relates to a pipe cutting machine that cuts an end of a metal cylindrical pipe into a predetermined width.

  2. Description of the Related Art Conventionally, a pipe cutting machine that cuts an axial end portion of a pipe in order to remove a weld drop at both ends of a pipe formed by rounding and welding a thin flat plate is known. As this pipe cutting machine, there is a machine that presses the cutter blade against the outer peripheral surface of the pipe and cuts the end of the pipe while rotating the cutter blade around the pipe (see Patent Document 1).

JP 2010-115747 A JP 2008-132578 A JP 2009-23059 A

However, since the pipe cutting machine presses the cutter blade from the outside to cut the pipe, a burr that protrudes inward is generated on the cut surface. For example, an automobile muffler in which a member such as a catalyst is loaded inside the pipe However, when the catalyst is inserted into the pipe, there is a problem that the member to be loaded is damaged due to the burr.
Moreover, since the cutter blade is rotated around the pipe to cut the pipe, not only the mechanism for rotating the cutter blade is complicated, but also the trajectory to rotate is constant, so various pipes with different pipe diameters are used. There is also a problem that cannot be applied to cutting.

  This invention is made in view of the said situation, and it aims at providing the pipe cutting machine which can be formed so that a burr | flash may protrude toward the outer side of a cylindrical pipe irrespective of the magnitude | size of the outer diameter of a cylindrical pipe. To do.

The pipe cutting machine of the present invention is
It is arranged inside a cylindrical pipe arranged so that the axial direction is horizontal, and has a circular lower side cutting edge having an outer diameter smaller than the inner diameter of the cylindrical pipe and having an acute cutting edge angle, An inner blade mechanism that rotationally drives the lower cutting blade,
The lower part of the cylindrical pipe is rotatably received so that it contacts the outer peripheral surface of the cylindrical pipe along the axial direction and the lower cutting edge of the inner blade mechanism contacts the uppermost position of the inner peripheral surface of the cylindrical pipe. A pair of support rollers capable of supporting up and down movement;
An outer blade mechanism that has a circular upper cutting edge that is in contact with the outer peripheral surface of the cylindrical pipe, and that moves the upper cutting blade downward and presses it to the uppermost position of the outer peripheral surface of the cylindrical pipe,
And a rotational drive unit that rotationally drives the cylindrical pipe.

With such a configuration, the cylindrical pipe is driven to rotate by the rotation drive unit, and the lower cutting edge having the sharp cutting edge angle of the inner blade mechanism is rotated so that the lower cutting blade and the upper cutting blade The cylindrical pipe is pressed and cut while rotating the upper cutting edge of the outer blade mechanism following the rotation of the cylindrical pipe, so that a burr is formed on the cut surface of the cylindrical pipe. The member can be easily inserted into the cylindrical pipe, and the member to be inserted is not damaged.
Furthermore, since the cylindrical pipe is rotatably supported by a pair of support rollers that can move up and down, the lower part of the inner blade mechanism is placed at the top of the inner peripheral surface of the cylindrical pipe according to the size of the cylindrical pipe. Since the support roller is moved up and down so that the side cutting edge comes into contact with the cylindrical pipe, the cylindrical pipe can be cut with the lower side cutting edge and the upper side cutting edge while the cylindrical pipe is supported by the support roller. Even if there is a change in the pipe diameter, it can be handled immediately.
In addition, since the lower side cutting edge and the upper side cutting edge are rotated while the cylindrical pipe is driven to rotate by the rotation driving unit, the lower side cutting edge and the upper side cutting edge are both cylindrical pipes. Since there is no need to rotate along the peripheral surface, it may be simply rotated, so that a complicated drive mechanism such as an eccentric rotation mechanism or a planetary gear structure that rotates the lower cutting edge and the upper cutting edge can be eliminated. .

In the pipe cutting machine of the present invention, the upper cutting edge of the outer blade mechanism has a blade surface parallel to the outer peripheral surface of the cylindrical pipe, and the lower cutting blade of the inner blade mechanism is the shaft of the cylindrical pipe. It is preferable that the cutting edge angle is 30 ° or more and less than 90 ° having a blade surface orthogonal to the direction.
With such a configuration, the upper cutting edge of the outer blade mechanism serves as a presser, and the cylindrical pipe is cut by the shearing action by the sharp lower cutting edge of the inner blade mechanism. A burr that faces can be formed. Moreover, since the cutting edge angle of the lower cutting edge is formed in the range of the cutting edge angle of 30 ° or more and less than 90 °, damage to the cutting blade can be reduced.

Furthermore, in the pipe cutting machine of the present invention, it is preferable that the outer diameter of the upper cutting edge of the outer blade mechanism is greater than or equal to the outer diameter of the lower cutting blade of the inner blade mechanism.
With this configuration, the contact area of the lower cutting edge of the inner blade mechanism with the cylindrical pipe is smaller than the area where the upper cutting edge of the outer blade mechanism contacts the cylindrical pipe. The stress on the cylindrical pipe of the cutting edge increases, and cutting with the lower cutting edge becomes easy.

Further, in the pipe cutting machine of the present invention, the inner blade mechanism includes a drive shaft having a lower cutting edge attached to the outer peripheral surface and inserted through a cylindrical pipe, and the driving shaft has an outer diameter equal to or larger than the outer diameter of the lower cutting blade. A cylinder-shaped tube support part that contacts the inner peripheral surface of the cylindrical pipe with an outer diameter, and a presser that can move up and down and rotatably contact the outer peripheral surface of the cylindrical pipe above the tube support part of the drive shaft It is preferable that a roller is provided and the rotational drive unit is constituted by a drive shaft, a tube support unit, a pressing roller, and a pair of support rollers.
With such a configuration, a tube support portion is formed on the drive shaft using the drive shaft of the inner blade mechanism and a pair of support rollers, and the tube is pressed while holding the cylindrical pipe by the tube support portion and the pressing roller. The cylindrical pipe can be rotationally driven with a simple configuration for rotating the support portion. In addition, since the cylindrical pipe can be rotationally driven simply by moving the support roller up and down in accordance with the size of the cylindrical pipe, the types of cylindrical pipes that can be cut increase.

According to the pipe cutting machine of the present invention, the cylindrical pipe is cut by the lower side cutting blade having the sharp cutting edge angle of the inner blade mechanism, so that a burr directed outward is formed on the cutting surface of the cylindrical pipe. In addition, the member can be easily inserted into the cylindrical pipe after being cut, and the member to be inserted is not damaged.
Furthermore, since the cylindrical pipe is rotatably supported by a pair of support rollers that can move up and down, the lower part of the inner blade mechanism is placed at the top of the inner peripheral surface of the cylindrical pipe according to the size of the cylindrical pipe. Since the support roller can be moved up and down so that the side cutting edge comes into contact, and the cylindrical pipe can be supported by these support rollers, it is possible to respond immediately even if the cylindrical pipe diameter is changed.

It is sectional drawing seen from the front which shows the whole structure of the pipe cutting machine by this embodiment. It is sectional drawing seen from the side surface which shows the whole structure of the pipe cutting machine by this embodiment. It is sectional drawing seen from the top which shows the whole structure of the pipe cutting machine by this embodiment. It is explanatory drawing for demonstrating the drive state of the inner blade mechanism of the pipe cutting machine by this embodiment, an outer blade mechanism, and a support roller. It is an enlarged side view of the inner blade mechanism, outer blade mechanism, and support roller of the pipe cutter according to the present embodiment. It is an enlarged view for demonstrating the cutting-blade angle of the inner blade mechanism of the pipe cutter by this embodiment, and an outer blade mechanism.

  Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 to 3, the pipe cutting machine 1 according to the present embodiment cuts an axial end of a cylindrical pipe 10 with an arbitrary width. The pipe 10 is formed by bending a metal plate material into a cylindrical shape by press working and connecting circumferential end portions by welding. The pipe 10 may have a weld drop formed at the opening by welding. When such a weld drop occurs, the opening end of the pipe 10 needs to be cut with a predetermined width.

  The pipe cutting machine 1 includes an inner blade mechanism 2 disposed inside a pipe 10, an inner blade mechanism drive motor 24 that rotationally drives the inner blade mechanism 2, and upper and lower portions that rotatably receive and support the lower portion of the pipe 10. A pair of movable support rollers 3, a rotation drive unit 4 that rotationally drives the pipe 10, an outer blade mechanism 5 that is disposed to face the upper outer peripheral surface of the pipe 10, and the outer blade mechanism 5 is moved up and down. A vertical drive mechanism 6 and a casing 8 in which these devices are housed are provided.

  The inner blade mechanism 2 includes a drive shaft 21 that is arranged such that the axial direction is a horizontal direction, a circular lower-side cutting blade 22 that is formed on the outer peripheral surface of the drive shaft 21 in the axial direction, and a drive shaft. And a cylindrical tube support portion 23 formed on the outer peripheral surface at a position away from the lower side cutting edge 22 in the axial direction of 21 and in contact with the inner peripheral surface of the pipe 10.

  As shown in FIG. 2, both ends of the drive shaft 21 are supported by the casing 8, and one end is connected to the inner blade mechanism drive motor 24. The drive shaft 21 is rotated by driving the inner blade mechanism drive motor 24. The drive shaft 21 is movable in the axial direction with respect to the casing 8 and the inner blade mechanism drive motor 24, and is supported by the casing 8 so as to be detachable from the inner blade mechanism drive motor 24. When fitting the pipe 10 to the drive shaft 21, the lock of the drive shaft 21 to the inner blade mechanism drive motor 24 is released and shifted in the axial direction to fit the pipe 10 to the drive shaft 21.

  As shown in FIGS. 4 and 5, the lower-side cutting edge 22 is formed in a bowl shape that protrudes in a direction orthogonal to the axial direction over the entire outer periphery of the drive shaft 21. The lower-side cutting edge 22 has an outer diameter smaller than the inner diameter of the pipe 10 and has an acute cutting edge angle. Specifically, as shown in FIG. 6, a first blade surface 22a orthogonal to the axial direction of the drive shaft 21, and a second blade blade that is continuous with the first blade surface 22a and the tip to form a cutting blade angle of 45 °. A blade surface 22b and a third blade surface 22c that is continuous with the second blade surface 22b and has a cutting blade angle of 30 ° between the blade surface 22a and the first blade surface 22a. The 2nd blade surface 22b is formed only in the front-end | tip part of the lower side cutting blade 22, and makes the front-end | tip of the lower side cutting blade 22 hard to chip by making a cutting blade angle larger than the 3rd blade surface 22c.

  The tube support portion 23 formed on the drive shaft 21 has an outer diameter that is equal to or greater than the outer diameter of the lower cutting edge 22 and is a shaft that is 1/3 or more of the entire length disposed in the casing 8 of the drive shaft 21. Has a directional length. The pipe support part 23 supports the pipe 10 by contacting the uppermost inner peripheral surface of the pipe 10 and rotates the pipe 10 by the rotation of the drive shaft 21. In addition, the tube support part 23 can form a polyurethane resin layer on the outer periphery. In this case, the outer diameter of the tube support part 23 is made larger than the outer diameter of the lower cutting edge 22, thereby making the polyurethane resin The pipe 10 can be rotated while the pipe 10 is reliably supported by the pipe support portion 23 and a pressing roller 41 to be described later by the elastic force.

  As shown in FIGS. 2 and 3, two pressing rollers 41 that are movable up and down and are rotatably contacted with the outer peripheral surface of the pipe 10 are located above the tube support portion 23 and facing the tube support portion 23. Has been placed. The pressing roller 41 is provided directly above the axis of the drive shaft 21 and is configured to move up and down individually. Each pressing roller 41 is supported by a long support member 42 having a bearing at one end in the longitudinal direction, and the support member 42 is located at a substantially intermediate position in the longitudinal direction via a swing shaft 43 fixed to the casing 8. Is supported to be swingable. As shown in FIGS. 1 and 3, an air cylinder 44 is attached to the other end of each support member 42, and a presser attached to one end of the support member 42 by the air cylinder 44. The roller 41 moves up and down with respect to the tube support portion 23 of the drive shaft 21. The pipe 10 is sandwiched between the pipe support part 23 and the pressure roller 41 by moving the pressure roller 41 downward by driving the air cylinder 44 and pressing the pipe 10 supported by the pipe support part 23. .

  Further, as shown in FIGS. 1 to 3, a pair of support rollers 3 capable of moving up and down are provided below the drive shaft 21 to rotatably receive and support the lower portion of the pipe 10. These two support rollers 3 are mounted on a roller support base 31 so as to be parallel to the axial direction of the drive shaft 21 and at the same position, and are rotatably supported via bearings.

  As shown in FIGS. 1 and 2, the roller support base 31 is configured to move up and down by a support roller air cylinder 32, and the roller support base 31 is fixed to the upper part of the support roller air cylinder 32, A lower portion of the support roller air cylinder 32 is fixed to the casing 8, and the roller support base 31 is moved up and down by driving the support roller air cylinder 32. Further, two guide bars 33 extending downward with a support roller air cylinder 32 interposed therebetween are fixed to the bottom surface of the roller support base 31, and these guide bars 33 are positioned at intermediate positions in the vertical direction of the casing 8. It is supported on the attached guide plate 35 through a linear motion bearing 34 so as to be movable up and down. The guide bar 33 allows the roller support base 31 to move up and down without tilting when the roller support base 31 moves up and down by the support roller air cylinder 32. The roller support base 31 waits at the lowest position until the pipe 10 is fitted to the drive shaft 21.

  In the present embodiment, the drive shaft 21 of the inner blade mechanism 2, the tube support portion 23 formed on the drive shaft 21, the pressing roller 41 disposed above the tube support portion 23 of the drive shaft 21, and a pair of The support roller 3 constitutes a rotation drive unit 4 that rotates the pipe 10.

  The roller 10 is moved so that the supporting roller 3 comes into contact with the lower outer peripheral surface of the pipe 10 in a state where the pipe 10 supported by the tube support portion 23 is held between the tube support portion 23 and the pressure roller 41 by moving the pressing roller 41 downward. The support base 31 is raised from the lowermost position so that the lower surface side of the pipe 10 is rotatably supported by the support roller 3. In this way, the support roller 3 is brought into contact with the outer peripheral surface on the lower surface side of the pipe 10 along the axial direction to support the pipe 10, so that the lower side cutting of the inner blade mechanism 2 is performed at the uppermost position of the inner peripheral surface of the pipe 10. The blade 22 also comes into contact in a stable state.

  Then, when the drive shaft 21 is rotationally driven in a state where the lower surface side of the pipe 10 is rotatably supported by the support roller 3, the pipe support portion is held while the pipe 10 is sandwiched between the pipe support portion 23 and the pressing roller 41. 23 rotates, and the pipe 10 rotates along with the rotation of the pipe support portion 23, and the pressing roller 41 rotates while pressing the pipe 10 following the rotation of the pipe 10.

As shown in FIGS. 1, 2, 4, and 5, a stopper 36 for axially positioning the pipe 10 fitted to the drive shaft 21 is movable on the roller support base 31 in the axial direction. It is attached.
Two stoppers 36 are provided in the axial direction directly below the drive shaft 21, and one stopper 36 is in a state where the cutting position of the pipe 10 is aligned with the tip of the lower cutting edge 22 of the inner blade mechanism 2. The stopper 10 is fixed to the roller support 31 so as to contact one end of the pipe 10, and the other stopper 36 is fixed to the roller support 31 so as to contact the other end surface of the pipe 10. These stoppers 36 prevent the pipe 10 from moving in the axial direction.

  Further, the stopper 36 is provided with a roller 37 capable of rotating at the top end portion thereof. When the pipe 10 is rotated by driving of the rotation driving unit 4, the roller 37 rotates with the rotation of the pipe 10. It has become. Since the roller 37 can prevent the pipe 10 from moving in the axial direction without hindering the rotation of the pipe 10, the lower end cutting edge 22 of the inner blade mechanism 2 reliably cuts a predetermined position at the end of the pipe 10 rotating. it can.

As shown in FIGS. 1, 2 and 4 to 6, the outer blade mechanism 5 arranged to face the upper outer peripheral surface of the pipe 10 is a circular ring-shaped upper side cutting that contacts the outer peripheral surface of the pipe 10. A blade 51, a circular ring-shaped pressing ring 52 having the same diameter as the upper cutting blade 51, and a flat surface of the upper cutting blade 51 with a predetermined gap, and the upper cutting blade 51 and the pressing ring. And a support shaft 53 to which 52 is fixed.
As shown in FIG. 6, the upper cutting edge 51 of the outer blade mechanism 5 includes a first blade surface 51 a extending in a direction orthogonal to the axial direction of the support shaft 53 and a second blade surface 51 b parallel to the outer peripheral surface of the pipe 10. And formed.
The upper side cutting edge 51 is formed at a cutting edge angle of 90 ° by the first blade surface 51a and the second blade surface 51b. However, the present invention is not limited to this, and the clearance angle is provided within about 5 °. May be set to 85 ° to 90 °. By providing this relief angle, the sharpness of the pipe 10 can be improved without damaging the blade. The outer blade mechanism 5 is provided at a position where the first blade surface 51 a of the upper cutting blade 51 slides with the first blade surface 22 a of the lower cutting blade 22 of the inner blade mechanism 2.
The upper-side cutting blade 51 is configured to rotate following the rotation operation of the pipe 10 by pressing the second blade surface 51b, which is the tip, against the outer peripheral surface of the pipe 10.

  Further, as shown in FIG. 6, a chamfered portion 52 a parallel to the second blade surface 22 b of the lower cutting edge 22 of the inner blade mechanism 2 is formed at the edge of the surface facing the upper cutting blade 51 in the pressing ring 52. Is formed. When the outer cutter mechanism 5 is moved downward by the chamfered portion 52a, the tip of the lower cutting edge 22 of the inner cutter mechanism 2 enters the gap between the upper cutting blade 51 and the pressing ring 52. It is easy. Further, the pressing ring 52 is brought into contact with the outer peripheral surface of the pipe 10 together with the upper cutting edge 51 so that the tip of the lower cutting edge 22 enters the gap between the pressing ring 52 and the upper cutting edge 51. Even if the upper side cutting edge 51 and the lower side cutting edge 22 are cut by shearing, the pipe 10 is less likely to be distorted.

  Furthermore, the outer diameters of the upper cutting edge 51 and the pressing ring 52 are formed to be equal to or larger than the outer diameter of the lower cutting edge 22 of the inner blade mechanism 2. Thus, by making the outer diameters of the upper cutting edge 51 and the holding ring 52 larger than the outer diameter of the lower cutting edge 22 of the inner cutting mechanism 2, the lower cutting edge 22 of the inner cutting mechanism 2 is connected to the pipe 10. Is smaller than the contact area of the upper cutting edge 51 and the holding ring 52 to the pipe 10, the stress on the pipe 10 of the lower cutting edge 22 is increased, and the cutting by the lower cutting edge 22 is performed. It becomes easy. In addition, it is preferable that the outer diameter of the upper-side cutting blade of the outer blade mechanism is set to be twice or less than the outer diameter of the lower-side cutting blade of the inner blade mechanism, thereby suppressing an increase in size of the apparatus.

Further, in the present embodiment, the vertical drive mechanism 6 that moves the upper side cutting blade 51 and the pressing ring 52 up and down with respect to the inner blade mechanism 2 via the support shaft 53 is provided.
As shown in FIGS. 1 to 3, the vertical drive mechanism 6 includes two bearing portions 61 that rotatably support both end portions of the support shaft 53, and first and second bearing portions 61 fixed to one end in the longitudinal direction. One arm portion 62, a second arm portion 64 whose upper end side is swingably connected to the other end side in the longitudinal direction of the first arm portion 62 via a swing shaft 63, and a lower portion of the second arm portion 64 A drive shaft 68 having an eccentric shaft portion 67 inserted through a bearing 66 through a hole 65 formed on the distal end side, and an outer blade mechanism drive motor 69 for rotating the drive shaft 68 are provided.

  As shown in FIGS. 1 and 3, the longitudinal center portion of the first arm portion 62 is supported by a support shaft 70 so as to be swingable. The longitudinal direction of the first arm portion 62 is centered on the support shaft 70. Both ends of the direction move up and down. Concentric eccentric shaft portions 71 are formed at both ends of the support shaft 70, and one of these eccentric shaft portions 71 is rotatably supported by a fixing member 81 fixed to the ceiling portion of the casing 8, and the other eccentric shaft portion 71 is supported. A shaft portion 71 is rotatably supported on the side surface portion of the casing 8. Further, the other eccentric shaft portion 71 protrudes to the outside of the casing 8, and the support shaft 70 is manually rotated eccentrically by attaching a helical gear 72 and a handle (not shown) to this externally exposed portion. The height of the first arm portion 62 can be finely adjusted.

  The outer blade mechanism drive motor 69 is disposed below the casing 8, and the drive shaft 68 connected to the outer blade mechanism drive motor 69 has a portion connected to the outer blade mechanism drive motor 69 and the casing. A portion excluding the tip portion supported by the bearing 8 is an eccentric shaft portion 67. When the eccentric shaft portion 67 is inserted into the hole 65 formed in the second arm portion 64 via the bearing 66 and the drive shaft 68 is rotated by the outer blade mechanism drive motor 69, the eccentric shaft portion 67 is rotated eccentrically, With this eccentric rotation, the second arm portion 64 becomes a crank mechanism, and the swing shaft 63 moves up and down while swinging around the upper swing shaft 63. Due to the movement of the second arm portion 64, both ends in the longitudinal direction of the first arm portion 62 move up and down, and the outer blade mechanism 5 supported via the bearing portion 61 moves up and down. When the side cutting edge 51 is moved downward, it is pressed against the uppermost position of the outer peripheral surface of the pipe 10.

In the present embodiment, the pipe 10 is fitted to the drive shaft 21, the roller support base 31 is raised from the lowest position, and the pipe 10 is received by the support roller 3 so as not to contact the drive shaft 21. With the cutting position aligned with the lower cutting edge 22 of the inner blade mechanism 2, the support roller 3 is lowered until the inner surface of the pipe 10 contacts the lower cutting edge 22. Next, the pressing roller 41 is lowered so that the pipe 10 is sandwiched between the tube support portion 23 and the pressing roller 41 of the drive shaft 21, and the tube support portion 23, the two pressing rollers 41, and a pair of support rollers. 3, the pipe 10 is rotatably supported.
In this embodiment, the inner blade mechanism 2 including the drive shaft 21 is fixed at a predetermined position and the outer blade mechanism 5 is lowered. However, the outer blade mechanism 5 is fixed at a predetermined position, and the drive shaft The inner blade mechanism 2 including 21 may be moved upward.

  Then, by driving the inner blade mechanism drive motor 24, the drive shaft 21 rotates, and the pipe 10 rotates due to the rotation of the pipe support portion 23, and the two pressing rollers follow the rotation of the pipe 10. 41 and the pair of support rollers 3 also rotate. While rotating the pipe 10, the outer blade mechanism 5 is lowered and the pipe 10 is pressed by the upper side cutting edge 51 and the holding ring 52, so that the upper side cutting edge 51 and the lower side cutting edge 22 cause the pipe 10. Is cut while rotating.

  Thus, according to the pipe cutting machine 1 of this embodiment, while rotating the pipe 10 with the rotation drive part 4, the lower side cutting blade 22 which has the acute cutting edge angle of the inner blade mechanism 2 is rotated, The pipe 10 is pressed by the lower cutting edge 22 and the upper cutting edge 51, and the pipe 10 is cut by the lower cutting edge 22 while rotating the upper cutting edge 51 of the outer blade mechanism 5 following the rotation of the pipe 10. Therefore, the burr | flash toward the outer side is formed in the cut surface of the pipe 10, the insertion of the member in the pipe 10 after a cutting | disconnection becomes easy, and also the member to insert is not damaged.

  Further, the pipe 10 is rotatably supported by moving the pair of support rollers 3 up and down so that the lower cutting edge 22 of the inner blade mechanism 2 is in contact with the top of the inner peripheral surface of the pipe 10. Since the pipe 10 is cut by the lower-side cutting edge 22 and the upper-side cutting edge 51, even if the pipe diameter is changed, it can be dealt with immediately.

  Further, while rotating the pipe 10 by the rotation drive unit 4, the lower cutting edge 22 of the inner blade mechanism 2 and the upper cutting blade 51 of the outer blade mechanism 5 are rotated and cut. None of the blade mechanisms 5 need to be rotated along the peripheral surface of the pipe 10 and may simply be rotated. Therefore, an eccentric rotation mechanism or a planetary gear mechanism that rotates the inner blade mechanism 2 and the outer blade mechanism 5. A complicated drive mechanism such as the above can be eliminated, and the structure of the inner blade mechanism 2 and the outer blade mechanism 5 can be simplified.

  Further, the rotation drive unit 4 uses the drive shaft 21 of the inner blade mechanism 2 and a pair of support rollers 3, while holding the pipe 10 by the tube support unit 23 and the pressing roller 41 of the drive shaft, The pipe 10 can be driven to rotate with a simple configuration in which the 23 is rotated. In addition, since the pipe 10 can be rotationally driven simply by moving the support roller 3 up and down according to the size of the pipe 10, the types of pipes 10 that can be cut increase.

  In addition, the pipe cutting machine of this invention is not limited to the said embodiment, The said embodiment is only an illustration and does not limit a claim. That is, the technology described in the claims is not limited to the embodiment described with reference to the above description and drawings, and various modifications can be made within the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Pipe cutting machine 2 Inner blade mechanism 3 Support roller 4 Rotation drive part 5 Outer blade mechanism 6 Vertical drive mechanism 8 Casing 10 Pipe 21 Drive shaft 22 Lower side cutting blade 22a First blade surface 22b Second blade surface 22c Third blade surface 23 Pipe support portion 24 Inner blade mechanism drive motor 31 Roller support base 41 Presser roller 51 Upper side cutting blade 51a First blade surface 51b Second blade surface 6 Vertical drive mechanism 62 First arm portion 64 Second arm portion 67 Eccentric shaft Part 68 drive shaft 69 drive motor for outer blade mechanism

Claims (4)

It is arranged inside a cylindrical pipe arranged so that the axial direction is horizontal, and has a circular lower side cutting edge having an outer diameter smaller than the inner diameter of the cylindrical pipe and having an acute cutting edge angle, An inner blade mechanism that rotationally drives the lower cutting blade,
The lower part of the cylindrical pipe is rotatably received so that it contacts the outer peripheral surface of the cylindrical pipe along the axial direction and the lower cutting edge of the inner blade mechanism contacts the uppermost position of the inner peripheral surface of the cylindrical pipe. A pair of support rollers capable of supporting up and down movement;
An outer blade mechanism that has a circular upper cutting edge that is in contact with the outer peripheral surface of the cylindrical pipe, and that moves the upper cutting blade downward and presses it to the uppermost position of the outer peripheral surface of the cylindrical pipe,
A pipe cutting machine comprising: a rotation driving unit that rotates and drives a cylindrical pipe. In the pipe cutting machine according to claim 1,
The upper side cutting blade of the outer blade mechanism has a blade surface parallel to the outer peripheral surface of the cylindrical pipe,
The lower cutting blade of the inner blade mechanism is a pipe cutting machine that has a blade surface perpendicular to the axial direction of the cylindrical pipe and has a cutting blade angle of 30 ° or more and less than 90 °. In the pipe cutting machine according to claim 1 or claim 2,
A pipe cutting machine in which the outer diameter of the upper cutting edge of the outer blade mechanism is greater than or equal to the outer diameter of the lower cutting edge of the inner blade mechanism. In the pipe cutting machine according to any one of claims 1 to 3,
The inner blade mechanism includes a drive shaft in which a lower cutting blade is attached to the outer peripheral surface and is inserted into a cylindrical pipe,
The drive shaft has a columnar tube support portion that is in contact with the inner peripheral surface of the cylindrical pipe with an outer diameter equal to or greater than the outer diameter of the lower-side cutting blade,
Provided above the tube support portion of the drive shaft is a pressing roller that can be moved up and down and rotatably contact the outer peripheral surface of the cylindrical pipe,
A pipe cutting machine in which a rotation drive unit is constituted by a drive shaft, a tube support unit, a pressing roller and a pair of support rollers.

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