JP4193660B2 - Band saw type cutting device - Google Patents

Description

  The present invention relates to a band saw type cutting apparatus, and more particularly to a band saw type cutting apparatus that cuts and disassembles a workpiece such as a large-diameter heat exchanger after use at a nuclear power plant.

Conventionally, this type of band saw type cutting device has an endless band saw blade suspended over a pair of sheaves rotating on a vertical surface, and the band saw blade is cut using a twisting roller provided before and after the cutting part. It was cut so as to be perpendicular to the object. In this band saw type cutting device, since the reciprocating blades of the band saw blade are arranged up and down, the band saw blade above the cutting part hits the object to be cut, so that it is impossible to cut an object larger than the diameter of the sheave. There was a problem. From this point of view, it is conceivable to increase the diameter of the sheave. However, there is a problem that the apparatus main body increases in size when the diameter of the sheave is increased. As a solution to this, it is possible to expand the cutting range of the workpiece by horizontally arranging the sheave so as to rotate on a horizontal plane. Therefore, in the band saw type cutting device of Patent Document 1, the cutting means for horizontally rotating an endless band saw blade stretched with a predetermined tension between a pair of horizontally arranged sheaves is moved up and down by the lifting and lowering moving means. By pressing to the object to be cut, cutting is performed. Thereby, even a large-sized workpiece can be cut with a compact device.
JP-A-8-90336

  However, in the band saw type cutting device of Patent Document 1, the endless band saw blade is always rotating horizontally with respect to the ground, and moves up and down only in a horizontal state with respect to the object to be cut. Is disadvantageous in that it is limited only to a columnar or cylindrical object to be cut. For this reason, for flat plate and rectangular tube-shaped workpieces where the cutting angle between the band saw blade and the object to be cut cannot be secured, the posture of the object to be cut is also prevented so that no load is applied to the band saw blade. There was a problem that it was necessary to change and cut.

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

  According to a first aspect of the present invention, there is provided a band saw type cutting device for cutting an object to be cut with an endless band saw blade to achieve the above object, and the band saw blade between a pair of sheaves rotating on a horizontal plane. Cutting means for horizontally rotating the band saw blade, and lifting means for raising and lowering the pair of sheaves individually via a pair of lifting members and pressing the band saw blade against the workpiece A connecting means that is provided between the pair of sheaves and the pair of elevating members and connects the sheaves to the elevating members so as to be able to swing vertically; and a change in the distance between the pair of sheaves. And a connection distance adjusting means for adjusting a connection distance between the sheave and the lifting member, and an operating means for operating the lifting amounts of the pair of lifting members.

  According to the present invention, an object to be cut is cut with an endless band saw blade suspended between a pair of sheaves rotating on a horizontal plane. Thereby, since the band saw blade is rotated horizontally, it can be cut regardless of the size of the diameter of the workpiece. When cutting the workpiece, if the shape of the workpiece is a columnar shape or a cylindrical shape, the operator operates the operating means so that the lifting and lowering amounts of the pair of lifting members are the same, and the band saw blade is in a horizontal state. And cut the object to be cut. However, when the object to be cut has a flat plate shape or a rectangular tube shape, the cutting angle between the band saw blade and the object to be cut cannot be secured when the band saw blade is in a horizontal state. In this case, the operator operates the operating means to change the amount of elevation of the pair of elevating members to change the band saw blade from the horizontal state to the inclined state, thereby securing the cutting angle. In the tilting operation of the band saw blade, if the band saw blade is changed from the horizontal state to the tilted state, there is a risk that the band saw blade is detached from the sheave. However, in the present invention, since the sheave is connected by the connecting means so as to be able to swing in the vertical direction with respect to the elevating member, the band saw blade is not detached from the sheave. In addition, the band saw blade needs to be held at a predetermined tension in order to cut the workpiece, but when the band saw blade is changed from the horizontal state to the inclined state or returned from the inclined state to the horizontal state, a pair of As the distance between the sheaves changes, the tension of the band saw blade changes. However, in the present invention, since the connecting distance adjusting means for adjusting the connecting distance between the sheave and the elevating member according to the change in the distance between the pair of sheaves is provided, the band saw blade can be held at a predetermined tension. it can. The degree to which the band saw blade is inclined can be easily determined by simply adjusting the amount of lifting of the pair of lifting members.

  Thereby, if the band saw type | mold cutting device of this invention is used, it can cut | disconnect efficiently with respect to the to-be-cut object of various magnitude | sizes and shapes.

  As described above, according to the band saw type cutting device according to the present invention, various objects to be cut can be cut regardless of the shape and size of the object to be cut.

  A preferred embodiment of a band saw type cutting device according to the present invention will be described below in detail with reference to the accompanying drawings.

  FIG. 1 is a perspective view showing a schematic configuration of a band saw type cutting device 10 according to an embodiment of the present invention, and FIG. 2 is a front view of the band saw type cutting device 10.

  As shown in FIGS. 1 and 2, the band saw type cutting device 10 includes a main body frame 12 mainly formed in a rectangular parallelepiped shape, a cutting means 14 provided in the main body frame 12, and an elevating means for moving the cutting means 14 up and down. 16, a connecting means 18 for connecting the cutting means 14 and the lifting means 16, and a connection for adjusting a connecting distance between the sheaves 38, 46 and the lifting members 50, 50 according to a change in the distance between the pair of sheaves 38, 46. The distance adjusting means 17 and the operating means 19 for operating the lifting amounts of the pair of lifting members 50 and 50 are configured. The operation cable from the operation means 19 to each device is omitted.

  The main body frame 12 includes a rectangular lower frame 20 arranged horizontally, support columns 22, 22... Provided perpendicular to the four corners of the lower frame 20, and a rectangular upper portion supported by the support columns 22, 22. Frame 24. The to-be-cut object 70 is located on the substantially center part of the lower frame 20 in the main body frame 12, and is mounted in the mounting base 26 which can move to the front-back direction shown with a black arrow.

  The cutting means 14 is disposed above the mounting table 26 and mainly includes a driving side unit 28, a driven side unit 30, and an endless band saw blade 32.

  The drive side unit 28 is disposed on the right side of the main body frame 12 in FIG. 2 and mainly stores a drive sheave 38 that rotates and drives on a horizontal plane and a bearing that rotatably supports the rotating shaft 42 of the drive sheave 38. It comprises a bearing box 36 and a cutting motor 40 that rotationally drives the drive sheave 38. On the other hand, the driven unit 30 is disposed on the left side of the main body frame 12 in FIG. 2 and mainly stores a driven sheave 46 that rotates following a horizontal plane and a bearing that rotatably supports the rotating shaft 42 of the driven sheave 46. The driven side bearing box 44, the connecting means 18, and the connecting distance adjusting means 17 are configured. Then, between the drive sheave 38 and the driven sheave 46, the endless band saw blade 32 is applied with a predetermined tension. As a result, the band saw blade 32 rotates horizontally.

  The elevating means 16 includes a pair of elevating shafts 48, 48 (ball screws), a pair of elevating members 50, 50 (nut members), a pair of gear boxes 52, 52, a horizontal shaft 54, an elevating motor 56, Consists of. The elevating shafts 48 and 48 are provided upright on both side surfaces of the main body frame 12, gear boxes 52 and 52 fixed to the upper surface of the main body frame 12, and bearings (not shown) built in the side surfaces of the lower frame 20. It is installed so that it can rotate freely. Each gear box 52, 52 is connected by a horizontal shaft 54 disposed on the upper surface of the main body frame 12, and an elevating motor 56 installed on the main body frame 12 is connected to the gear box 52. As a result, the driving force of the lifting motor 56 can be transmitted to the gearboxes 52, 52 via the horizontal shaft 54, and the lifting shafts 48, 48 can be rotated in forward and reverse directions. In addition, a plurality of gears (not shown) are provided inside each gear box 52, 52, and each lifting shaft 48, 48 is provided by changing the gear ratio of each gear box 52, 52 individually. It can be rotated at different rotational speeds.

  The gearboxes 52 and 52 and the raising / lowering motor 56 are connected to the operating means 19 disposed on the side of the main body frame 12, and the gear ratios of the gearboxes 52 and 52 are changed or the raising / lowering is operated by the operation of the operating means 19. The drive of the motor 56 is controlled. Thereby, since the raising / lowering amount of each raising / lowering member 50 and 50 can be made different, the raising / lowering amount of the drive sheave 38 and the driven sheave 46 can be operated separately.

  Support members 58 and 58 are fixed to the elevating members 50 and 50, respectively, and linear bearings 60, 60... Are provided at both ends of the support members 58 and 58, and vertically on the outer side surfaces of the support columns 22, 22. The guide rails 62 and 62 are provided so as to be slidable. As a result, the elevating members 50, 50 can be raised and lowered while being guided by the elevating shafts 48, 48 and the respective columns 22, 22,. In addition, raising / lowering of the raising / lowering means 16 is not limited to a ball screw structure, What is necessary is just a structure and a mechanism which can raise / lower the drive sheave 38 and the driven sheave 46 separately.

  Next, the connecting means 18 and the connecting distance adjusting means 17 will be described.

  The drive-side lifting member 50 and the bearing box 36 are connected via the connecting means 18. That is, a U-shaped connecting plate 51 is fixed to the lower surface of the elevating member 50, and the connecting plate 51 and the bearing box 36 are swingably connected by the connecting pin 66. Thus, the drive sheave 38 can swing vertically with the connecting pin 66 as a support shaft. On the other hand, the lift member 50 on the driven side and the bearing box 44 are connected via the connecting distance adjusting means 17 and the connecting means 18. That is, a servo motor 49 and a bearing (not shown) capable of rotating in the forward and reverse directions are accommodated in a support member 58 fixed to the elevating member 50 on the driven sheave 46 side, and the ball screw 68 is driven from the servo motor 49 to the drive sheave. It protrudes horizontally on the 38 side. A nut member 64 is screwed onto the ball screw 68, whereby the connection distance adjusting means 17 is configured. A U-shaped connecting plate 51 is fixed to the lower surface of the nut member 64, and the connecting plate 51 and the bearing box 44 are swingably connected by a connecting pin 66. Thereby, the driven sheave 46 can be swung vertically with the connecting pin 66 as a support shaft. The driven sheave 46 automatically slides along the ball screw 68 via the nut member 64, the connecting plate 51, the bearing box 44, and the connecting pin 66 by the forward rotation or reverse rotation of the servo motor 49, The distance from the driven sheave 46 can be adjusted. The servo motor 49 is configured so that the difference between the driven sheave 38 and the driven sheave 46 operated by the operating means 19, ie, the difference between the driven sheave 38 and the driven sheave 46 when the band saw blade 32 is inclined by the difference in the driven amount. The amount of rotation is set in conjunction with the change in distance. Thereby, even if the band saw blade 32 is inclined, the tension of the band saw blade 32 is kept constant.

  Next, the operation of the band saw type cutting apparatus 10 according to the embodiment of the present invention configured as described above will be described.

  First, when the elevating motor 56 is driven to raise the pair of elevating members 50, 50, the band saw blade 32 connected to the elevating member 50 by the connecting means 18 is raised. After raising the band saw blade 32, the workpiece 70 is placed on the placing table 26.

  Next, the cutting motor 40 is driven to horizontally rotate the band saw blade 32, and the lifting motor 56 is driven to lower until the rotating band saw blade 32 contacts the workpiece 70. At this time, the reciprocating blades 32A and 32B of the band saw blade 32 that rotates horizontally may be brought into contact with two portions of the object 70 to be cut at the same time, and the two blades 32A or 32B may be cut at the same time. One place of the cut object 70 may be cut.

  After the band saw blade 32 is brought into contact with the workpiece 70, the band saw blade 32 is gradually lowered to cut the workpiece 70 completely. At this time, since the band saw blade 32 rotates horizontally, the workpiece 70 can be cut regardless of the diameter of the workpiece 70, and the apparatus main body can be made compact.

  In the cutting of the workpiece 70, by changing the gear ratio of each gear box 52, 52 by the operating means 19, the lifting amount of the pair of lifting members 50, 50 can be changed. Thereby, since the band saw blade 32 can be inclined as shown in FIG. 3, not only the columnar or cylindrical object 70 but also the flat or rectangular tube object 70 is cut. Can be secured.

  FIG. 3 is an enlarged view of the cutting portion 14 in the band saw type cutting device 10 of the present invention as seen from the front. As shown in FIG. 3A, when the pair of elevating members 50 and 50 are individually raised and lowered so that the height of the driving elevating member 50 is higher than that of the driven elevating member 50, the pair of connecting means 18 , 18 causes the drive sheave 38 and the driven sheave 46 to swing in the directions indicated by the black arrows. Accordingly, the band saw blade 32 can be inclined so that the left side is downward in FIG. 3A without detaching from the drive sheave 38 and the driven sheave 46. Since the object 70 can be cut by being brought into contact with the object 70 in this inclined state, the cutting angle can be ensured even for the object 70 having a flat plate shape or a rectangular tube shape. .

  By the way, when the band saw blade 32 is inclined, the distance between the drive sheave 38 and the driven sheave 46 is longer than that in the horizontal state, but the distance between the elevating member 50 and the driven sheave 46 is increased by the connecting distance adjusting means 17. Since the adjustment is made by the amount corresponding thereto, the tension of the band saw blade 32 suspended between the drive sheave 38 and the driven sheave 46 can be always kept constant.

  Further, as shown in FIG. 3B, when it is desired to incline so that the drive sheave 38 side of the band saw blade 32 faces downward, the driven-side lifting member 50 is lifted to raise the driving-side lifting member 50. What is necessary is just to operate with the operation means 19 so that it may descend | fall.

  As described above, the band saw type cutting device 10 can change the height of the pair of elevating members 50, 50 and shift the height of the drive sheave 38 and the driven sheave 46 to incline the band saw blade 32. It is possible to cut the workpiece 70 having a various shape at various cutting angles. Furthermore, while the workpiece 70 is being cut, the elevating member 50 on the drive sheave 38 side, for example, is fixed, and the elevating member 50 on the driven sheave 46 side is moved up and down so that it moves up and down. It is possible to operate 32 in an arc shape. In this manner, if the band saw blade 32 is moved in an arc shape, the workpiece 70 can be cut regardless of the shape. In addition, it is possible to freely change the inclination angle state of the band saw blade 32 during cutting.

  In the band saw type cutting device 10 described above, the number, shape, material, and the like of each member and device are not particularly limited. As in the band saw type cutting device 90 shown in FIG. 4, rotary actuators 72 and 72 are installed on each lifting member 50 as lifting means, and the lifting shaft fixed to the main body frame 12 by driving the actuators 72 and 72. You may comprise so that the raising / lowering members 50 and 50 may raise / lower along 74,74. Further, a hydraulic jack 76 is installed on the driven lifting member 50 as the connecting distance adjusting means 17, and the driven unit 30 is pushed outward with a constant pressure by the hydraulic jack 76 by a connected hydraulic circuit (not shown). You may let them. Thereby, since each actuator 72 and 72 can be driven separately and the height of the drive side unit 28 and the driven unit 30 can be shifted, the band saw blade 32 can be inclined. In addition, even if the distance connecting the drive side unit 28 and the driven side unit 30 changes with the inclination of the band saw blade 32, the tension of the band saw blade 32 is kept constant by the hydraulic jack 76. The distance can be adjusted by sliding the driven unit 30 in the lateral direction.

  Furthermore, in the band saw type cutting apparatuses 10 and 90, the main body frame 12 is fixed, and the cutting position of the workpiece 70 is moved back and forth on the mounting table, but there is no particular limitation. The main body frame 12 may be configured to be movable.

The perspective view which showed schematic structure of the band saw type cutting device which is embodiment of this invention Sectional drawing which looked at the band saw type cutting device which is an embodiment of the present invention from the front Explanatory drawing which looked at the cutting part in the band saw type cutting device which is embodiment of this invention from the front Sectional drawing which looked at the band saw type cutting device which is a modification of embodiment of this invention from the front

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Band saw type cutting device, 12 ... Main body frame, 14 ... Cutting means, 16 ... Lifting means, 17 ... Connection distance adjustment means, 18 ... Connection means, 20 ... Lower frame, 22 ... Post, 24 ... Upper frame, 26 ... Mounting base 28 ... Drive-side unit 30 ... Drive-side unit 32 ... Saw blade 36 ... Drive-side bearing box 38 ... Drive sheave 40 ... Cutting motor 42 ... Rotating shaft 44 ... Drive-side bearing Box, 46 ... Driven sheave, 48 ... Elevating shaft, 49 ... Servo motor, 50 ... Elevating member, 52 ... Gear box, 54 ... Horizontal shaft, 56 ... Elevating motor, 58 ... Supporting member, 60 ... Linear bearing, 62 ... Guide rail, 64 ... nut member, 66 ... connecting pin, 68 ... ball screw, 70 ... object to be cut

Claims (1)

In a band saw type cutting device that cuts an object to be cut with an endless band saw blade,
A cutting means that hangs the band saw blade between a pair of sheaves rotating on a horizontal plane and horizontally rotates the band saw blade;
Elevating means for individually elevating the pair of sheaves via a pair of elevating members and pressing the band saw blade against the workpiece;
A coupling means provided between the pair of sheaves and the pair of elevating members, and coupling the sheaves to the elevating members so that the sheaves can swing vertically;
A connection distance adjusting means for adjusting a connection distance between the sheave and the elevating member according to a change in a distance between the pair of sheaves;
A band saw-type cutting device comprising: an operating means for operating a lifting amount of each of the pair of lifting members.

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