JP4352321B2 - Band saw type cutting device - Google Patents

Description

  The present invention relates to a band saw type cutting device, and more particularly to a band saw type cutting device for cutting and dismantling large equipment such as a heat exchanger in a nuclear power plant.

  At a nuclear power plant, a heat exchanger is cut and disassembled using a band saw type cutting device. A band saw type cutting device is constructed by winding an endless band saw blade around a pair of horizontally arranged sheaves, and rotating the sheave to drive the band saw blade while pressing it against the workpiece An object is cut in the vertical direction (see Patent Document 1).

By the way, some of the objects to be cut are formed in a hollow shape, and the hollow part is filled with a liquid material, a harmful substance, or the like. It is necessary to cut the object to be cut in the horizontal direction so that harmful substances do not spill.
Patent No. 2967800

  However, the band saw type cutting device described in Patent Document 1 is a device that cuts the workpiece in the vertical direction, and cannot cut the workpiece in the horizontal direction.

  In view of this, a device is conceivable in which a pair of sheaves are arranged vertically and an endless band saw blade is wound around, and the pair of sheaves is moved in the horizontal direction to cut the workpiece in the horizontal direction. However, in this case, the upper piece of the cut object falls due to its own weight, and the band saw blade is sandwiched between the upper piece and the lower piece of the object to be cut. This could cause the band saw blade to break.

  This invention is made | formed in view of such a situation, and it aims at providing the band saw type | mold cutting device which can cut | disconnect a to-be-cut object in a horizontal direction.

In order to achieve the above object, a first aspect of the present invention provides a pair of sheaves provided in an elevation plane and spaced apart in the horizontal direction, and the pair of sheaves wound around the pair of sheaves. An endless band saw blade that circulates around the sheave, advancing and retreating means for moving the band saw blade back and forth in the horizontal direction relative to the workpiece, and a pin and a disk fixed to the upper surface of the workpiece. comprising holding means for holding the upper portion of the object to be cut by engaging the core guides, and while holding the upper part of the object to be cut by said holding means, said object to be cut by the band saw blade It is characterized by cutting in the horizontal direction.

  According to the first aspect of the present invention, since the object to be cut is horizontally cut with the band saw blade while holding the upper part of the object to be cut, the upper piece and the lower piece of the cut object to be cut are It is possible to prevent the band saw blade from being sandwiched between them. Therefore, the workpiece can be cut in the horizontal direction with the band saw blade.

According to a second aspect of the present invention, in the first aspect of the invention, the upper pressing jig for pressing the upper portion of the side surface of the workpiece and a lower pressing jig for pressing the lower portion of the side surface of the workpiece are provided. It is characterized by that.
According to the second aspect of the present invention, since the object to be cut is pressed by the upper pressing jig and the lower pressing jig, it is possible to prevent the cutting object from sideways during cutting. Therefore, the to-be-cut object can be prevented from falling, and the to-be-cut object can be safely cut.
According to a third aspect of the present invention, in the first or second aspect of the present invention, there is provided rotation means for rotating a table on which the workpiece is placed relative to the band saw blade.

According to invention of Claim 3 , a to-be-cut object can be cut | disconnected from various directions by rotating the table which mounted the to-be-cut object relatively with respect to a band saw blade. Therefore, since only the outer peripheral part of a to-be-cut object can be cut | disconnected, the to-be-cut object formed in the cylinder shape can be cut | disconnected efficiently.

According to a fourth aspect of the present invention, in the third aspect of the present invention, there is provided a tilting means for tilting the table relative to the band saw blade.

According to the fourth aspect of the present invention, the object to be cut can be inclined relative to the band saw blade, so that it can be cut obliquely.

  According to the band saw type cutting apparatus according to the present invention, since the upper part of the object to be cut is held while being cut, the band saw blade is sandwiched between the upper piece and the lower piece of the cut object. It is possible to prevent the object to be cut and to cut the object in the horizontal direction.

  Hereinafter, preferred embodiments of a band saw type cutting device according to the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a perspective view showing the configuration of the band saw type cutting device of the present embodiment, FIG. 2 is a front view of the band saw type cutting device, and FIG. 3 is a side view of the band saw type cutting device. The band saw type cutting device 10 shown in these drawings is a device for cutting the workpiece 12 in the horizontal direction. The to-be-cut object 12 is formed in the hollow shape, and the liquid substance is contained in the inside. 1 to 3, two directions orthogonal to each other on the horizontal plane are defined as an X-axis direction and a Y-axis direction, and a height direction is defined as a Z-axis direction.

  The band saw type cutting device 10 includes a main body frame 14, a transverse frame 16, an upper frame 18, and a table 20, and the workpiece 12 is placed on the table 20. In addition, it is preferable to fix the to-be-cut object 12 to the table 20 by fixing means, such as a volt | bolt and a nut.

  As shown in FIG. 2, the table 20 is fixed on a swing plate 22, and the swing plate 22 is swingably connected to a rotating plate 24 via a universal joint (universal joint) 28. Yes. A cylinder 26 is installed upward on the rotating plate 24, and a rod 26 </ b> A of the cylinder 26 is connected to an edge portion of the swing plate 22. Therefore, the angle of the rocking plate 22 can be freely adjusted by driving the cylinder 26 to extend and contract the rod 26A. The number of cylinders 26 is preferably three or more from the viewpoint that the angle of the swing plate 22 can be freely adjusted. However, by providing a fulcrum at the edge of the swing plate 22, the number of cylinders 26 is set to two or one. You can also.

  The rotating plate 24 is rotatably supported by the base 30 and is connected to a rotating motor (not shown). Therefore, the rotating plate 24 can be rotated by driving the rotating motor. As the rotation motor, a motor capable of controlling the rotation amount (rotation angle) (for example, a stepping motor) is used, and the rotation plate 24 can be rotated by a predetermined angle.

  The transverse frame 16 is formed in a substantially H shape as shown in FIG. 2, and is attached to the main body frame 14 so as to be slidable in the X-axis direction. That is, guide rails 32, 32... Are respectively installed on the outer surface of the main body frame 14 in the X-axis direction, and the transverse frame 16 is slidably supported along the guide rails 32.

  The traversing frame 16 is connected to a traversing motor 38 via a screw jack 36 as shown in FIG. 3, and is driven to slide in the X-axis direction by driving the traversing motor 38. . Thereby, the traversing frame 16 can be moved back and forth with respect to the table 20 described above.

  A pair of sheaves 42 and 42 are rotatably supported on the transverse frame 16. The pair of sheaves 42, 42 are arranged in the same elevation surface (vertical surface) at a predetermined interval in the lateral direction, and the band saw blade 44 is wound around the pair of sheaves 42, 42. The band saw blade 44 is formed in an endless shape and has a cutting blade on the table 20 side.

  A cutting motor 46 is connected to the right sheave 42 in FIG. 2 of the pair of sheaves 42, 42. Driving the cutting motor 46 rotates the sheave 42 so that the band saw blade 44 travels around the pair of sheaves 42, 42. Further, a jack (not shown) for adjusting the position in the Y-axis direction is connected to the left sheave 42 in FIG. Since the jack can adjust the distance between the pair of sheaves 42, 42, the tension of the band saw blade 44 wound around the pair of sheaves 42, 42 can be adjusted.

  An upper frame 18 is supported on the upper surface of the main body frame 14 so as to be slidable in the X-axis direction. That is, guide rails 50 and 50 are arranged on the upper surface of the main body frame 14 in the X-axis direction, and the upper frame 18 is slidably supported on the guide rail 50. Further, a feed screw 52 disposed in the X-axis direction is screwed to the upper frame 18, and the feed screw 52 is connected to a retraction motor 54 attached to the main body frame 14. Therefore, when the retracting motor 54 is driven to rotate the feed screw 52, the upper frame 18 moves in the X-axis direction. Therefore, the upper frame 18 can be disposed above the table 20 as indicated by a solid line in FIG. 3, or can be retracted from above the table 20 as indicated by a two-dot chain line in FIG.

  As shown in FIG. 2, a clamp device 60 is attached to the upper frame 18. The clamp device 60 includes a lifting motor 62, and the lifting motor 62 is connected to a lifting block 66 via a screw jack 64. Then, by driving the elevating motor 62, the rotational force is transmitted to the elevating block 66 via the screw jack 64, and the elevating block 66 is moved up and down.

  As shown in FIG. 4A, a cylindrical pin receiving portion 68 is provided on the lower surface of the lifting block 66. A conical groove 68A is formed at the lower end of the pin receiving portion 68, and a tip 80A of a pin 80 of an alignment jig 76 described later is inserted into the groove 68A. The pin receiving portion 68 is arranged on the rotation center line of the table 20 when the upper frame 18 is arranged on the table 20 as shown in FIG.

  As shown in FIG. 4A, clamp arms 70 and 70 are supported at both ends of the lifting block 66 so as to be swingable about shafts 74 and 74, respectively. The clamp arm 70 is switched between a swingable state and a fixed state by operating the handle 72. The disc 78 of the alignment jig 76 is held by the clamp arms 70, 70.

  The alignment jig 76 includes a pin 80 and a disk 78, and the pin 80 is fixed to the upper surface of the workpiece 12 by welding or bonding while standing. A taper is formed on the upper end 80A of the pin 80, and the tip 12A enters the groove 68A of the pin receiving portion 68, whereby the workpiece 12 is positioned. The disc 78 is attached so as to be orthogonal to the pin 80, and a rib is formed on the lower surface.

  When the alignment jig 76 is held by the clamp device 60 configured as described above, first, as shown in FIG. 4A, the pin receiver of the clamp device 60 is placed above the pin 80 of the alignment jig 76. The part 68 is arranged. Then, the handle 72 is operated to swing the clamp arms 70, 70 outward.

  Next, the elevating motor 62 (see FIG. 2) is driven to lower the elevating block 66, and the tip 80A of the pin 80 of the alignment jig 76 is moved to the pin receiving portion 68 as shown in FIG. Engage with the groove 68A. Next, the clamp arms 70 are swung and engaged with the disk 78 of the alignment jig 76. Then, the handle 72 is operated to fix the clamp arms 70, 70.

  Next, tension is applied in the direction in which the lifting block 66 is lifted by the lifting motor 62. As a result, the workpiece 12 is held in a state of being tensioned upward via the alignment jig 76. In this state, since the pin 80 and the pin receiving portion 68 are engaged with each other, even if the workpiece 12 is rotated together with the table 20, the core does not run out.

  As shown in FIG. 2, the main body frame 14 includes a pair of upper pressing jigs 82 and 82 that press the upper portion of the workpiece 12, and a pair of lower pressing jigs 84 and 84 that press the lower portion of the workpiece 12. Is provided. Here, the upper part of the workpiece 12 is an upper part with respect to the cutting line cut by the band saw blade 44, and the lower part of the workpiece 12 is a lower part with respect to the cutting line. .

  The pair of upper pressing jigs 82 and 82 are disposed on both sides of the workpiece 12. The upper holding jig 82 is composed of a cylinder 82A fixed to the main body frame 14 and a rod 82B that protrudes from the cylinder 82A toward the workpiece 12 in the horizontal direction. The tip of the rod 82B is brought into contact with the workpiece 12 by extending toward. Therefore, the object 12 can be clamped from both sides by bringing the rods 82B and 82B of the pair of upper pressing jigs 82 and 82 into contact with the object 12 from both sides. Therefore, the rolling of the upper part of the workpiece 12 can be prevented. Note that a roller 82C is rotatably supported at the tip of the rod 82B, and the workpiece 12 is pressed via the roller 82C, so that the workpiece 12 moves up and down. However, a load in the vertical direction is not applied to the upper pressing jig 82.

  The pair of lower pressing jigs 84 and 84 are disposed on both sides of the workpiece 12 and the cylinder 84A fixed to the main body frame 14 as well as the pair of upper pressing jigs 82 and 82. It is comprised from the rod 84B which protrudes in the horizontal direction toward the to-be-cut object 12 from the cylinder 84A. Accordingly, the rods 84B and 84B of the pair of lower pressing jigs 84 and 84 are brought into contact with the workpiece 12 from both sides, whereby the lower portion of the workpiece 12 can be clamped from both sides. Therefore, the rolling of the lower part of the workpiece 12 can be prevented.

  The number and arrangement of the upper holding jig 82 and the lower holding jig 84 are not particularly limited. For example, a plurality of upper pressing jigs 82 and lower pressing jigs 84 may be arranged side by side or in the same horizontal plane. . Further, the configurations of the upper pressing jig 82 and the lower pressing jig 84 are not limited to those described above. For example, an arm is swingably supported on the main body frame 14 and the tip of the arm is cut. You may make it contact | abut to the thing 12. FIG.

  Next, the operation of the band saw type cutting device 10 configured as described above will be described with reference to FIGS. 1 to 4 and FIGS. 5 (A) to 5 (F). FIGS. 5A to 5F show planar cross sections obtained by cutting the workpiece 12 in the horizontal direction at the height position of the band saw blade 44.

  First, as a preparatory work, the alignment jig 76 is welded onto the center line of the workpiece 12. Then, the workpiece 12 is suspended and conveyed by a crane device (not shown) and placed on the table 20. At that time, the clamping device 60 is retracted from above the table 20, and the clamping device 60 is disposed above the table 20 after the workpiece 12 is conveyed.

  Next, the posture of the workpiece 12 is adjusted by rotating the table 20. As shown in FIG. 5 (A), the posture of the workpiece 12 is such that the band saw blade 44 and the side surface of the workpiece 12 are arranged with a slight angle.

  Next, the clamping device 60 of FIG. 4 is engaged with the alignment jig 76. That is, the elevating block 66 of the clamp device 60 is lowered, and the upper end 80A of the pin 80 of the alignment jig 76 is engaged with the groove 68A of the pin receiving portion 68. Next, the handle 72 is operated to swing the clamp arm 70 and engage with the disk 78 of the alignment jig 76. Then, by driving the lifting / lowering motor 62 in FIG. 2, the upper portion of the workpiece 12 is held in a state of being tensioned upward.

  Next, the upper pressing jigs 82 and 82 and the lower pressing jigs 84 and 84 are brought into contact with the workpiece 12. Thus, the preparation work is completed, and then the cutting work is performed.

  In the cutting operation, first, the cutting motor 46 in FIG. 1 is driven to rotate the sheave 42. As a result, the band saw blade 44 wound around the pair of sheaves 42 and 42 travels around the sheaves 42 and 42. In this state, the transverse motor 38 is driven to advance the transverse frame 16 relative to the workpiece 12. Accordingly, the upper horizontal portion of the band saw blade 44 that is traveling around is pressed against the workpiece 12, and the workpiece 12 is cut. At that time, as shown in FIG. 5B, the band saw blade 44 is slightly inclined and pressed against the side surface of the workpiece 12, so that the cutting angle is secured and the workpiece 12 can be cut smoothly. it can. That is, it can be prevented that the traveling position of the band saw blade 44 swings and the cutting position is shifted as when the band saw blade 44 is pressed in parallel with the side surface of the workpiece 12.

  After one side of the workpiece 12 is completely cut as shown in FIG. 5B, the band saw blade 44 is moved backward with respect to the workpiece 12 by driving the traversing motor 38 of FIG. Further, the upper pressing jig 82 and the lower pressing jig 84 are retracted from the workpiece 12. Next, by rotating the table 20 by 90 °, as shown in FIG. 5C, a side surface different from the cut side surface of the workpiece 12 is opposed to the band saw blade 44. In the same manner as in the above-described cutting operation, the upper pressing jig 82 and the lower pressing jig 84 are brought into contact with the workpiece 12 and then pressed against the workpiece 12 while the band saw blade 44 runs around. Then, the side surface of the workpiece 12 is cut as shown in FIG. Thereby, the two side surfaces of the workpiece 12 are cut.

  By repeating the same operation, another side of the workpiece 12 is further cut as shown in FIG. That is, the band saw blade 44, the upper pressing jig 82, and the lower pressing jig 84 are moved backward, and the table 20 is further rotated by 90 °, and then the workpiece 12 is moved by the upper pressing jig 82 and the lower pressing jig 84. The workpiece 12 is cut by the band saw blade 44 while being pressed. Thereby, as shown in FIG.5 (E), three sides of the side surfaces of the to-be-cut object 12 are cut | disconnected.

  Similarly, the remaining one side of the workpiece 12 is cut as shown in FIG. Thereby, all the side surfaces of the workpiece 12 are cut, and the workpiece 12 is disassembled into an upper piece and a lower piece.

  During the cutting operation described above, the upper portion of the workpiece 12 is held in a state in which tension is applied upward by the clamp device 60. Therefore, the upper piece of the workpiece 12 is not dropped by its own weight during or after cutting, and the band saw blade 44 is not sandwiched between the upper piece and the lower piece of the workpiece 12. Therefore, the workpiece 12 can be reliably cut in the horizontal direction without disconnecting the band saw blade 44. Thereby, the to-be-cut object 12 can be disassembled, without spilling the liquid substance in the to-be-cut object 12. FIG.

  Moreover, according to this Embodiment, since the table 20 was rotated, the to-be-cut object 12 can be cut | disconnected from various directions, and only the outer peripheral part of the to-be-cut object 12 can be cut | disconnected. Thereby, even if it is a large sized to-be-cut | disconnected object 12, it can cut | disconnect, without enlarging an apparatus. That is, when the table 20 is not rotated, the feed amount (forward movement amount) of the band saw blade 44 must be increased as the workpiece 12 is increased in size. The workpiece 12 can be efficiently cut by the amount, and the large workpiece 12 can be cut without increasing the size of the apparatus.

  In addition, according to the present embodiment, since the workpiece 12 is pressed by the upper pressing jig 82 and the lower pressing jig 84, it is possible to prevent the workpiece 12 from shaking sideways during cutting. . Therefore, the to-be-cut object 12 can be prevented from falling, and the to-be-cut object 12 can be safely cut.

  Furthermore, according to the present embodiment, since the pin 80 of the alignment jig 76 is engaged with the pin receiving portion 68 of the clamp device 60, it is possible to prevent the rotation center of the workpiece 12 from swinging. Can do. Therefore, even when the workpiece 12 is rotated, the position of the cutting line by the band saw blade 44 is not shifted, and the workpiece 12 can always be cut horizontally at the same height.

  In the present embodiment, since the angle of the table 20 can be adjusted, it is possible to cope with a case where the cutting line is displaced. For example, as shown in FIG. 6, when the position of the cutting line at the start of cutting and the position of the cutting line at the final cutting are shifted in the height direction in a state where the three side surfaces of the workpiece 12 are cut. By adjusting the angle of the table 20 with respect to the band saw blade 44, the workpiece 12 is cut as shown by a two-dot chain line. Thereby, since the cutting line of each side surface of the to-be-cut object 12 is connected, the to-be-cut object 12 can be disassembled into an upper piece and a lower piece.

  In the above-described embodiment, the table 20 is rotated by the rotation motor 46. However, the present invention is not limited to this, and the table 20 may be rotated manually.

  In the above-described embodiment, the table 20 is rotated by 90 °. However, the present invention is not limited to this, and the table 20 may be rotated according to the cross-sectional shape of the workpiece 12. For example, in the case of the workpiece 12 having a horizontal cross section formed into a regular triangular shape, the cutting may be performed by rotating every 120 °. Further, in the case of the workpiece 12 formed in a cylindrical shape having a horizontal cross section, the workpiece 12 may be cut by the band saw blade 44 while rotating the table 20 at a low speed.

  In the above-described embodiment, the table 20 is rotated. However, the table 20 and the band saw blade 44 need only be relatively rotated. Therefore, the band saw blade 44 may be moved by rotating the main body frame 14 or the transverse frame 16 around the table 20.

  In the above-described embodiment, the table 20 is inclined. However, the table 20 and the band saw blade 44 may be inclined relatively. Therefore, the traverse frame 16 may be inclined and the band saw blade 44 may be inclined.

  Further, in the above-described embodiment, the clamp device 60 is used as a holding unit that holds the upper portion of the workpiece 12 with tension upward. However, the configuration of the holding unit is not limited to this, for example, Alternatively, the upper part of the workpiece 12 may be adsorbed by a negative pressure adsorbing means and held upward with tension.

The perspective view which shows the structure of embodiment of the band saw type cutting device which concerns on this invention. The front view which shows the band saw type cutting device of FIG. The side view which shows the band saw type cutting device of FIG. Explanatory drawing showing the configuration of the clamp device Explanatory drawing which shows the effect | action of the band saw type cutting device of FIG. The perspective view explaining the correction method of the shift | offset | difference of a cutting line

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Band saw type cutting device, 12 ... Object to be cut, 14 ... Body frame, 16 ... Traverse frame, 18 ... Upper frame, 20 ... Table, 42 ... Sheave, 44 ... Band saw blade, 60 ... Clamp device, 62 ... For raising / lowering Motor, 68 ... Pin receiving part, 70 ... Clamp arm, 76 ... Alignment jig, 82 ... Upper pressing jig, 84 ... Lower pressing jig

Claims (4)

A pair of sheaves provided in the elevation plane and spaced apart in the horizontal direction;
An endless band saw blade wound around the pair of sheaves and traveling around the pair of sheaves;
Advancing and retracting means for advancing and retracting the band saw blade in a horizontal direction relative to the workpiece;
Holding means for holding the upper part of the workpiece by engaging with an alignment jig composed of a pin and a disk fixed to the upper surface of the workpiece;
Wherein the while holding the upper part of the object to be cut by said holding means, a band saw type cutting apparatus characterized by cutting the object to be cut horizontally in the band saw blade. The band saw type cutting device according to claim 1, further comprising: an upper pressing jig that presses an upper part of a side surface of the workpiece, and a lower pressing jig that presses a lower part of the side surface of the workpiece. . The band saw type cutting apparatus according to claim 1 or 2, further comprising a rotating means for rotating a table on which the workpiece is placed relative to the band saw blade. 4. A band saw type cutting apparatus according to claim 3, further comprising tilting means for tilting the table relative to the band saw blade.

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