JP2967800B2 - Band saw type cutting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a band saw type cutting device, and more particularly to a band saw type cutting device for cutting and disassembling a heat exchanger after use in a nuclear power plant.

[0002]

2. Description of the Related Art Conventionally, this kind of band saw type cutting device is
As shown in FIG. 9, a pair of sheaves 1 and 1 are arranged so as to rotate in a vertical plane, and an endless band saw blade 2 is hung over the pair of sheaves 1 and 1 to cut the front and rear of the cut portion. ., The band saw blade 2 is corrected so as to be perpendicular to the object 4 using the twist rollers 3, 3,.

[0003]

However, in the conventional band saw-type cutting device configured as described above, the reciprocating blades 2A and 2B of the band saw blade are arranged vertically, so that the band saw above the cutting portion is used. The blade 2 </ b> A hits the workpiece 4. For this reason, there is a problem that the workpiece 4 larger than the diameter of the sheaves 1 and 1 cannot be cut.

[0004] From such a viewpoint, it is conceivable to increase the diameter of the sheaves 1 and 1. However, if the diameter of the sheaves 1 and 1 is increased, there is a problem that the apparatus body also becomes large. The present invention has been made in view of such circumstances,
It is an object of the present invention to provide a band saw type cutting device capable of cutting a large object with a compact device.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a band saw type cutting apparatus for cutting a large-diameter workpiece with an endless band saw blade suspended over a pair of sheaves. In this, the pair of sheaves are horizontally arranged, and an endless band saw blade is stretched with a predetermined tension on the pair of sheaves to horizontally rotate the band saw blade between the pair of sheaves. A rotary cutting means, a jack that makes at least one of the pair of sheaves movable, and varies the tension of the band saw blade, and a balance weight that balances the weight of the cutting means; An elevating and lowering mechanism for lowering and pressing the rotating band saw blade against the object to be cut disposed below the cutting device, and the cut piece of the object to be cut by the cutting means so as not to fall. V-shaped to support cut pieces And it made a support, characterized in that it consists of a guide rail for the movable body frame of the cutting device through the guide member.

[0006]

According to the present invention, a pair of sheaves are horizontally arranged, and an endless band saw blade is stretched on the pair of sheaves with a predetermined tension so that the band saw blade is horizontally positioned between the pair of sheaves. The cutting means is configured to rotate, and the cutting means is lowered by the elevating and lowering mechanism, and the band saw blade is pressed against the object disposed below the cutting means to cut the object. This allows
The endless band saw blade cuts an object to be cut while rotating between a pair of sheaves in a horizontal plane, and thus can cut regardless of the diameter of the object to be cut. Therefore, unlike the conventional cutting device in which the band saw blade rotates on the vertical plane, the sheave diameter does not need to be larger than the diameter of the object to be cut, so that the cutting device can be made compact.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a band saw type cutting apparatus according to the present invention will be described below in detail with reference to the accompanying drawings. FIG.
FIG. 1 shows a perspective view of an embodiment of a band saw type cutting apparatus according to the present invention. As shown in FIG. 1, the band saw type cutting device includes a main body frame 12 formed mainly in a rectangular parallelepiped shape, a cutting device 14 provided in the main body frame 12 so as to be able to move up and down, and a vertical movement for moving the cutting device 14 up and down. And a mechanism.

The main body frame 12 comprises a rectangular lower frame 16 disposed horizontally, columns 18 to 24 vertically provided at four corners of the lower frame 16, and columns 1 to 24.
And a rectangular upper frame 25 supported by 8 to 24. The object to be cut 60 is attached to the main body frame 12.
And is mounted on a mounting table 80 provided substantially at the center of the lower frame 16. A rotary roller 82 is provided in front of the lower frame 16 for supporting the tip of the object 60 and rotating the object 60 to start cutting at an arbitrary cutting position. The rotating roller 82 is rotatably provided via a bracket 86 on a support frame 84 connected to the lower frame 16.

The cutting device 14 has an integral structure in which a driving unit 26 and a driven unit 28 are connected by connecting members 30, 30 as shown in plan and front views in FIGS. 2 and 3, respectively. ing. Drive unit 26
A pair of guide rails 3 in which a drive motor base 31 is disposed on the side surfaces of the columns 18 and 20 of the main body frame 12;
It has a structure supported by slide members 2 and 32 via guide members 34 and 34 so as to be slidable. A drive sheave 40 is horizontally disposed below the drive motor base 31, and the drive sheave 40 is connected to a rotation shaft 38 of a sheave drive motor 36 provided above the drive motor base 31. . On the other hand, the driven side unit 28 is configured such that the driven wheel base 42 is
The guide rails 44 are slidably supported by a pair of guide rails 44 provided on the side surface of the base 4 via guide members 46. A driven sheave 48 is horizontally disposed below the driven wheel base 42, and a rotation shaft 48 </ b> A of the driven sheave 48 is rotatably supported by a bearing 50 provided on the driven wheel base 42. . The bearing 50 is provided with the driven wheel base 4.
2 and a jack 5
The tension of the band saw blade 58 is adjusted when the band saw blade 58 described later is stretched on the drive sheave 42 and the driven sheave 48 by extending and contracting the jack 52. be able to. In addition, the expansion and contraction operation of the jack 52 is performed by a handle 53 connected to the jack 52.
Is performed by rotating.

The connecting members 30, 30 include connecting arms 54, 54 provided above between the drive motor base 31 and the driven wheel base 40, and the connecting arms 54, 5
4, support arms 56, 56, which are arranged at both ends
. Are connected to the drive motor base 31 and the driven wheel base 42, respectively, to connect the drive unit 26 and the driven unit 28 to each other. As described above, the connection members 30, 30 can be prevented from interfering with the object 60 during cutting by bridging the connection members 30, 30 upward. Then, the driving sheave 40 described above is used.
The driven sheave 48 is provided with an endless band saw blade 58 formed in a band shape. The band saw blade 58 rotates horizontally by driving a sheave drive motor 38 connected to the drive sheave 40. Further, as described above, the band saw blade 58 can adjust the tension by moving the driven sheave 48 by expanding and contracting the jack 52 connected to the driven sheave 48.

The lifting / lowering moving mechanism 62 includes a nut 64 formed at one end of the driven wheel base 42.
Ball screw 6 provided in parallel with the columns 18 to 24
6, the cutting device 14 is moved up and down by rotating the ball screw 66. Further, a lifting drive motor 68 is connected to the ball screw 66, and by driving the lift drive motor 68, the cutting device 14 can be moved up and down automatically.

Also, since the cutting device 14 is heavy,
A large driving force is required for the lifting drive motor 68 when moving up and down. For this reason, the balance weights 70, 70,... Are suspended from the cutting device 14 as follows, whereby the weights are offset and the driving force of the lifting drive motor 68 is reduced. That is, as shown in FIG. 1, the brackets 72 and 7 are
Guide rollers 74, 74,... Are attached via 2,. Wires 76, 76,... Are suspended from the guide rollers 74, 74,.
, 76 are connected to the four corners of the cutting device 14, respectively, and the balance ends 70,
70 are respectively suspended. Also, guides 78, 78,... Are provided on the side surfaces of the columns 18 to 24, and move the balance weights 70, 70,.

As described above, by balancing the cutting device 14 and the balance weights 70, 70,..., The driving force of the drive motor 68 when the cutting device 14 is moved up and down can be smoothly reduced with a small driving force. 14 can be moved. Next, the operation of the embodiment of the band saw type cutting device 10 according to the present invention configured as described above will be described.

First, the lifting drive motor 68 is driven to raise the cutting device 14. Then, the object to be cut 60 is placed on the mounting table 80, and the rotating roller 82 is rotated to determine the cutting position. Next, cutting is started. The sheave drive motor 36 is driven to rotate the band saw blade 58, and the elevating drive motor 68 is driven to lower the cutting device 14 and apply the rotating band saw blade 58 to the workpiece 60. Contact Then, the cutting device 14 is gradually lowered to cut the workpiece 60.

When the cutting is completed, the cutting device 14 is raised, and the driving of the sheave drive motor 36 is stopped. And
The cut piece of the cut object 60 is removed to complete the cutting. When further cutting is performed, the object 60 is moved and the above operation is repeated. As described above, in the band saw type cutting apparatus 10 of the present embodiment, since the driving sheave 36 and the driven sheave 48 are disposed horizontally, the band saw blade 58 rotates in the horizontal plane. The workpiece 60 can be cut regardless of the size. Thus, unlike the conventional band saw type cutting device, the sheave diameter is not restricted by the size of the cut object 60, and therefore, the large cut object 60 can be cut without increasing the sheave diameter. Therefore, the apparatus main body can be made compact.

In addition, since the band saw blade 58 is rotated horizontally, it is not necessary to apply a twist unlike a conventional band saw type cutting device, so that the life of the band saw blade 58 is extended. In addition, when the band saw blade 58 is replaced, the band saw blade 58 is replaced.
Can be performed extremely easily. Further, the band saw type cutting apparatus 10 of the present embodiment
Reciprocating blades 58A, 58B of the horizontally rotating band saw blade 58
May be brought into contact with two places of the workpiece 60 to cut two places at the same time (see FIG. 4), and one blade 58A or 58B
May be used to cut one portion of the object 60 (see FIG. 5). At this time, when the cut piece of the cut object 60 falls,
There is a danger that the band saw blade 58 may be damaged by contact with the band saw blade 58 on the front side. However, by supporting the cut piece as shown in FIGS. 6 and 7, contact can be avoided. Can be.
That is, in FIG. 6, the holding means 88 is provided above the object 60 to be cut, and the cut pieces are held by the holding means 88, thereby preventing the cut pieces from falling. In FIG. 7, a V-shaped support 90 is provided below the object 60 to be cut.
By supporting the cut piece with the support tool 90, it is possible to prevent the fall when falling.

In this embodiment, since the apparatus main body 10 is fixed, the cutting object 60 is moved when the cutting position of the cutting object 60 is moved, but as shown in FIG. The apparatus main body 10 may be configured to be movable. That is, guide rails 92, 92 are provided below the main body frame 12, and the main body frame 1 is mounted on the guide rails 92, 92.
2 are slidably provided via guide members 94, 94,... When changing the cutting position, the apparatus main body 10 is moved along the guide rails 92.

In place of the guide rails 94, a wheel with a brake (not shown) may be provided at the lower part of the main body frame 12 so as to be movable.

[0019]

According to the band saw type cutting device of the present invention, since the band saw blade is rotated in the horizontal plane, the size of the object to be cut is not restricted by the sheave diameter.
In addition, this makes it possible to cut a large object without increasing the sheave diameter, so that the apparatus body can be made compact. In addition, by disposing the pair of sheaves horizontally, the band saw blade can be used without twisting, so that the life of the band saw blade is extended and the mounting work when replacing the band saw blade is simplified. It can be carried out. Also,
The tension of the band saw blade can be adjusted by rotating the jack handle. Further, since the balance weight is suspended from the cutting device, the weight is offset, the driving force of the lifting drive motor is reduced, and the cutting device can be moved smoothly. In addition, by supporting the cut piece of the object to be cut by the V-shaped support, it is possible to prevent the object from falling when dropped. Further, since the apparatus main body is movably provided on the guide rail, the cutting position can be easily changed by moving the apparatus main body along the guide rail.

[Brief description of the drawings]

FIG. 1 is a perspective view of an embodiment of a band saw type cutting apparatus according to the present invention.

FIG. 2 is a partial plan view of the cutting device of the band saw type cutting device according to the present invention.

FIG. 3 is a partial front view of the cutting device of the band saw type cutting device according to the present invention.

FIG. 4 is an explanatory view in a case where an object to be cut is cut at two places with a band saw blade.

FIG. 5 is an explanatory diagram of a case where an object to be cut is cut at one location of a band saw blade;

FIG. 6 is an explanatory view of a band saw type cutting device according to the present invention provided with cutting piece holding means.

FIG. 7 is an explanatory view when a cutting piece support is provided in the band saw type cutting apparatus according to the present invention.

FIG. 8 is an explanatory view when a moving means is provided in the band saw type cutting apparatus according to the present invention.

FIG. 9 is an explanatory diagram of a conventional technique.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Band saw type cutting device 60 ... Cutting object 12 ... Main body frame 62 ... Elevation moving mechanism 14 ... Cutting device 70 ... Balance weight 26 ... Drive unit 82 ... Rotating roller 28 ... Driving side unit 88 ... Cutting piece clamping means 30 ... Connecting member 90: Cut piece support 36: Sheave drive motor 92: Guide rail 40: Drive sheave 48: Driven sheave 52: Jack

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-53-139284 (JP, A) JP-A-59-17124 (JP, U) JP-A-1-60820 (JP, U) JP-A 62- 168214 (JP, U) JIKA 55-93425 (JP, U) Jiko 6-5848 (JP, Y2) (58) Field surveyed (Int. Cl. ⁶ , DB name) B23D 53/04 B23D 53 / 00 B23D 55/10

Claims (1)

(57) [Claims] 1. A band saw type cutting apparatus for cutting a large-diameter workpiece with an endless band saw blade suspended over a pair of sheaves, wherein said pair of sheaves are arranged horizontally, A cutting tool of a horizontal rotation type, in which an endless band saw blade is stretched with a predetermined tension on the sheave and the band saw blade is horizontally rotated between the pair of sheaves, and at least one of the pair of sheaves is moved. Make it possible,
A jack for varying the tension of the band saw blade and a balance weight for balancing the weight of the cutting means.
An elevating and lowering mechanism for lowering the cutting means and pressing the rotating band saw blade against the object disposed below the cutting device; and a cut piece of the object to be cut by the cutting means. Don't fall
V-shaped support for supporting the cut piece
Tool and the body frame of the cutting device are moved via a guide member.
A band saw type cutting device comprising: a guide rail for allowing free movement.