JP4711236B2 - Band saw type cutting device and cutting method using band saw type cutting device - Google Patents

Description

  The present invention relates to a band saw type cutting device and a cutting method using a band saw type cutting device, and more particularly to a band saw type cutting device and a band saw for dismantling a large-scale workpiece such as a thermal power, a horizontal axis steam turbine generator stator of a nuclear power plant. The present invention relates to a cutting method using a mold cutting device.

  Large generator stators installed in thermal power and nuclear power plants are composed of a casing that covers the outermost shell, a fan-shaped silicon steel sheet with a thickness of several tens of thousands, a copper coil, and a diameter of several meters. The lower half is embedded in a concrete base on the floor of the building. In addition, its weight reaches several hundred tons.

  Conventionally, when such a generator stator is disassembled, the casing and the like are gas blown, and then an operator uses a tool such as a bar to peel off the fan-shaped silicon steel sheets one by one. Had been implemented.

Further, the device disclosed in Patent Document 1 as a conventional band saw type cutting device arranges a pair of sheaves horizontally (arranged so that the rotation axis of the sheave is directed in the vertical direction), and an endless band saw on the pair of sheaves. By constructing a cutting means that hangs the blade and moves the band saw blade between a pair of sheaves, this cutting means is lowered by a lifting and lowering movement mechanism, and the band saw blade is pressed against the workpiece arranged below the cutting means Cut the workpiece. That is, the band saw type cutting device of Patent Document 1 is a device that cuts an object by moving a cutting means only in a vertical direction.
Japanese Patent No. 2967800

  By the way, when the generator stator is dismantled, the building in which the generator stator is embedded is often dismantled at the same time. For this reason, the building must be emptied as soon as possible.

  However, in the band saw type cutting device of Patent Document 1 in which the cutting means moves only in the vertical direction, a portion of the generator stator that is embedded in concrete (1/2 of the whole) and a portion that is not embedded (1 of the entire). / 2) is difficult to divide horizontally, so there is a problem that it takes a lot of time to dismantle, and many workers are required.

  In order to solve this problem, it is conceivable to first divide the portion embedded in the concrete and the portion not embedded, and then carry the portion not embedded to the outside of the building for dismantling. According to this work, even in simple calculations, the work time in the building is halved. However, in the band saw type cutting device of Patent Document 1, although it is possible to cut the generator stator in the vertical direction, it is impossible to cut in the horizontal direction. Needed.

  The present invention has been made in view of such circumstances, and a band saw type cutting device and a band saw type cutting capable of efficiently disassembling a large-scale workpiece such as a generator stator partially embedded in concrete. It aims at providing the cutting method by an apparatus.

The invention according to claim 1, in order to achieve the above object, in a band saw type cutting device for cutting the object to be cut by an endless band saw blade pass subjected to a pair of sheaves is run between the sheave, the band saw The die cutting apparatus includes a drive block including a motor that rotationally drives one sheave of the pair of sheaves, a driven block including the other driven sheave of the pair of sheaves, the drive block, and the driven block And the drive block, the driven block, and the upper beam straddle so as to straddle the object to be cut, and a pin provided at a lower portion of the leg portion of the drive block by rotating the drive block in a range of 90 degrees, the attitude of the cutting means consisting of a pair of sheaves the band saw blade is vertically cut position Characterized in that it is a variable between the horizontal cutting position.

  According to the first aspect of the invention, the posture of the cutting means composed of the pair of sheaves and the band saw blade can be changed between the vertical cutting posture and the horizontal cutting posture. The workpiece is cut in the vertical cutting posture, and then the cutting means is cut by changing the posture of the cutting means to the horizontal cutting posture. Thereby, since a to-be-cut object is divided | segmented finely, even if it is a large-sized to-be-cut object, such as a generator stator, it can disassemble efficiently.

  The invention according to claim 2 is the posture in which the pair of sheaves moves in the vertical direction in a state in which the rotation axis of the pair of sheaves faces in the vertical direction. The horizontal cutting posture is a posture in which the pair of sheaves moves in the horizontal direction with the rotation shaft of the pair of sheaves oriented in the horizontal direction.

  According to the second aspect of the present invention, the vertical cutting posture of the cutting means is a posture in which the pair of sheaves moves in the vertical direction with the rotation shafts of the pair of sheaves facing the vertical direction, and the horizontal direction A cutting | disconnection attitude | position is an attitude | position which a pair of sheave moves to a horizontal direction in the state in which the rotating shaft of a pair of sheave has faced the horizontal direction. Depending on the object to be cut, it may be preferable to first cut the cutting means in the horizontal cutting posture and then change the cutting means to the vertical cutting posture for cutting.

  According to a third aspect of the present invention, there is provided a guide member that movably supports the cutting means, a drive means that moves the cutting means along the guide member, and a posture of the guide member in a vertical direction and a horizontal direction. And a posture changing means for changing.

  According to the third aspect of the present invention, the attitude of the cutting means can be changed by changing the attitude of the guide member that supports the cutting means movably in the vertical direction or the horizontal direction by the attitude changing means. Further, the cutting means moves in the vertical direction or the horizontal direction along the guide member by the power from the driving means to cut the object to be cut.

According to the present invention, for example, by rotating the apparatus main body within a range of 90 degrees with the leg portion of the apparatus main body having a pin structure as a base point, vertical cutting and horizontal cutting at both end positions thereof Is possible.

The invention according to claim 4 uses the band saw type cutting device according to claim 1, 2 or 3 to hold the cutting means in a vertical cutting posture or a horizontal cutting posture to be cut. After cutting, the posture of the cutting means is changed to a horizontal cutting posture or a vertical cutting posture to cut the object to be cut.

According to the fourth aspect of the present invention, the cutting means is set to the vertical cutting posture or the horizontal cutting posture to cut the workpiece, and then the cutting device is set to the horizontal cutting posture or the vertical cutting. Change the posture and cut the workpiece. Thereby, since a to-be-cut object is divided | segmented finely, even if it is a large-sized to-be-cut object, such as a generator stator, it can disassemble efficiently.

  According to the band saw type cutting device and the cutting method using the band saw type cutting device according to the present invention, the posture of the cutting means comprising the pair of sheaves and the band saw blade can be changed between the vertical cutting posture and the horizontal cutting posture. Therefore, even a large-sized workpiece such as a generator stator partially embedded in concrete can be finely divided. Thereby, a large sized to-be-cut | disconnected object can be disassembled efficiently.

  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a band saw type cutting device and a cutting method using 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 band saw type cutting apparatus 10 according to an embodiment.

  This band saw type cutting device 10 is transported and used in a thermal power plant in which a generator stator (object to be cut) 200 shown in FIGS. 2 (A) and 2 (B) is installed, and in a building of a nuclear power plant. The generator stator 200 is composed of a casing 202 covering the outermost shell, a fan-shaped silicon steel plate (not shown) having a thickness of several tens of thousands and a copper coil (not shown), and has a diameter of several meters. The lower half is embedded in the concrete base 204 on the building floor.

  The band saw-type cutting device 10 of FIG. 1 is mainly composed of a drive block 12, a driven block 14, and a pair of upper beams 16, 16, and these can be divided and transported, so that transport is easy. Further, when the generator stator 200 is cut, the drive block 12, the driven block 14, and the upper beams 16, 16 are straddled so as to straddle the generator stator 200 as shown in FIG.

  The drive block 12 is configured by assembling a saw blade traveling motor 20, a pair of traveling rails 22, 22, a screw jack 24, and a saw blade moving motor (driving means) 26 to a block main body 18 made of steel. The driven block 14 is configured by assembling a saw blade tensioning jack 30, a pair of travel rails 22 and 22, a screw jack 24, and a saw blade moving motor (driving means) 26 to a block main body 28 made of steel. The drive block 12 and the driven block 14 configured in this way are connected via upper beams 16 and 16 at the upper part thereof.

  Further, as shown in FIGS. 3A and 3B, the shape and length of the upper beams 16A and 16B and the length of the band saw blade 32 described later are changed according to the sizes of the workpieces 206A and 206B. By doing so, it is possible to deal with workpieces 206A and 206B of any size. In this band saw type cutting device 10, when the band saw blade 32 is too long with respect to the object to be cut, that is, when the distance between the drive block 12 and the driven block 14 is long, the band saw blade 32 vibrates and cuts. There is a problem that it becomes difficult to do. Therefore, in the band saw type cutting apparatus 10 according to the embodiment, the distance between the drive block 12 and the driven block 14 that is optimum for the workpiece is changed by changing the size of the upper beam 16 and the length of the band saw blade 32. Can keep.

  When the drive block 12, the driven block 14, and the pair of upper beams 16 and 16 are assembled as shown in FIG. 1, the endless band saw blade 32 becomes a cutting unit (cutting means) 34 of the drive block 12 as shown in FIG. And a cutting unit (cutting means) 36 of the driven block 14.

  The cutting unit 34 has a frame 38 that is movable along the running rails 22, 22, and the screw jack 24 is screwed into a nut portion (not shown) of the frame 38. Accordingly, when the screw jack 24 is rotationally driven by the saw blade moving motor 26, the cutting unit 34 is moved along the traveling rails 22 and 22 by the feeding operation.

  Three sheaves 40, 40, 40 are arranged in a row on the frame body 38 of the cutting unit 34 via the rotation shaft 42. Further, the rotating shaft of the saw blade traveling motor 20 is connected to the lowermost sheave 40 in FIG. 4, and the lowermost sheave 40 is rotationally driven as a driving sheave.

  On the other hand, the cutting unit 36 has a frame 44 that is movable along the traveling rails 22, 22, and the screw jack 24 is screwed to a nut portion (not shown) of the frame 44. Therefore, when the screw jack 24 is rotationally driven by the saw blade moving motor 26, the cutting unit 36 is moved along the traveling rails 22 and 22 by the feeding operation. The two saw blade moving motors 26 and 26 are synchronously controlled by a control unit (not shown) so that the cutting units 34 and 36 are simultaneously moved in the same direction by the same amount.

  Three sheaves 40, 40, 40 are arranged in a row on the frame body 44 of the cutting unit 36 via the rotation shaft 42. Further, a tension jack 30 is connected to the rotation shaft 42 of the sheave 40 in the center portion of FIG. Accordingly, when the sheave 40 is moved horizontally by the tensioning jack 30 via the slider 46 in the right direction in FIG. 4, the band saw blade 32 is tensioned, and when the sheave 40 is moved horizontally in the left-right direction, the band saw blade 32 is Relaxed.

  When the band saw blade 32 is transferred to the cutting units 34, 36, the tensioning jack 30 is moved to the left position (relaxed position) in advance, and the band saw blade 19 is staggered in each sheave 40, 40, as shown in FIG. Hang on the shape. Thereafter, the band saw blade 32 is tensioned by the tensioning jack 30, and the band saw blade 32 is held by all the sheaves 40, 40... By the tension of the band saw blade 32. As a result, the band saw blade 32 is stretched between the cutting units 34 and 36 as shown in FIG. 5 so that the generator stator 200 can be cut in the horizontal direction.

  The cutting postures of the cutting units 34 and 36 in FIGS. 1, 3, 4, and 5 are horizontal cutting postures in which the rotation shaft 42 of the sheave 40 is oriented in the horizontal direction. On the other hand, the posture of the cutting units 34 and 36 shown in FIG. 6 is a vertical cutting posture in which the rotation shaft 42 of the sheave 40 is oriented in the vertical direction.

  Such a change in the cutting posture can be achieved by the fact that one leg portion 13 of the drive block 12 has a pivot structure by the pin 15 as shown in FIGS. That is, the drive block 12 is connected to the overhead crane 208 of the building, and the drive block 12 is rotated within a range of 90 degrees with the pin 15 as a base point by operating the overhead crane 208 up and down and horizontally. Horizontal cutting by the horizontal cutting posture and vertical cutting by the vertical cutting posture (FIG. 7D) can be performed at both ends of the rotation range. Similarly, the cutting posture of the driven block 14 is changed by the overhead crane 208.

  In FIG. 6, reference numeral 48 denotes a bracing member of the band saw blade 32, and these bracing members 48, 48... Are attached to the tip of an L-shaped arm 50. The arm 50 is attached to a pair of cylindrical holders 52 attached to the cutting units 34 and 36 so as to be extendable and retractable, and the band saw blade 32 is prevented from shaking according to the size of the object to be cut (generator stator 200). It is stretched and set to the optimal position. 4 and 5, the bracing member 48, the arm 50, and the holder 52 are omitted.

  When the generator stator 200 is cut by the band saw blade 32, the band saw blade 32 is caused to travel between the pair of cutting units 34 and 36 by the saw blade traveling motor 20 in the horizontal cutting posture of FIG. Since the sheaves 40, 40... Other than the sheave 40 to which the saw blade traveling motor 20 is connected are in a driven state, all the sheaves 40, 40. The blade 32 is caused to travel.

  The saw blade moving motors 26 and 26 installed in the drive block 12 and the driven block 14 are operated in synchronization, and the screw jacks 24 and 24 connected to the saw blade moving motors 26 and 26 are rotated. Thus, the cutting units 34 and 36 installed in the drive block 12 and the driven block 14 are caused to self-run along the guide rails 22 and 22, respectively. With the band saw blade 32 running, the cutting units 34 and 36 are self-run, and the band saw blade 32 is pressed against the generator stator 200 to start cutting. When the generator stator 200 is cut in the horizontal direction by a predetermined amount, the jack 54 shown in FIG. 5 receives the weight of the upper part of the cut generator stator 200, and then the cutting is continued.

  An overhead crane 208 is installed in almost all buildings in the power plant. The capacity of the overhead crane 208 is in the tens of tons class in most cases, but the weight of the generator stator 200 is several hundred tons. For this reason, in order to carry the generator stator 200 out of the building using the overhead crane 208, the generator stator 200 must be divided into blocks of about several tens of tons. That is, as shown in FIG. 5, if the generator stator 200 is only cut in half in the horizontal direction by the band saw blade 32 in the horizontal cutting posture, the upper half of the generator stator 200 cut by the overhead crane 208 is removed. It cannot be taken out of the building. In the horizontal cutting, when the movement of the cutting units 34 and 36 for one stroke is completed, the entire band saw type cutting apparatus 10 is moved in the cutting direction by the one stroke and the cutting is resumed. This operation is repeated until the end of cutting.

  Therefore, in the band saw-type cutting device 10 of the embodiment, after the generator stator 200 is cut in approximately half in the horizontal direction, the cutting units 34 and 36 are moved to 90 using the pin 15 having the pin structure as a base point as shown in FIG. The posture is changed to the vertical cutting posture shown in FIG.

  Then, the cutting units 34 and 36 are moved up by the saw blade moving motors 26 and 26, and then the drive block 12 and the driven block 14 are moved so that the generator stator 200 is positioned below the cutting units 34 and 36. Adjust the position. Thereafter, the cutting units 34 and 36 are moved downward by the saw blade moving motors 26 and 26 to cut the generator stator 200 in the vertical direction as shown in FIG. When one cutting operation is completed, the positions of the drive block 12 and the driven block 14 are even in the horizontal direction by the cutting length as indicated by the two-dot chain line in FIG. 8, and the cutting is resumed. By repeating this operation a plurality of times, the generator stator 200 cut in the horizontal direction can be cut and divided in the vertical direction, and the upper half of the generator stator 200 is divided into several blocks B, B... it can. By making the weight per block B several tens of tons class, the blocks B, B,... Of the disassembled generator stator 200 can be carried out by the overhead crane 208 to the outside of the building.

  Therefore, according to the band saw type cutting device 10 of the embodiment, the horizontal direction cutting and the vertical direction cutting are possible with one band saw type cutting device 10, so that the generator stator 200 of the generator stator 200 is compared with the conventional band saw type cutting device. Dismantling efficiency can be improved by 50% or more. Moreover, according to the cutting method by the band saw type cutting device 10, since it can be performed by two persons, an operator and a monitoring person, it leads also to a reduction in personnel.

  FIG. 10 shows that the band saw type cutting device 10 is installed on simple height adjustment bases 210 and 212, and the height of the band saw blade 32 with respect to the floor 212 is changed to horizontally cut an arbitrary position of the workpiece 214. This is an example that can be made.

  FIG. 11 shows a modification example in which a workpiece 216 other than that installed on the floor 212 is vertically cut. According to this modified example, the band saw type cutting device 10 is installed at a certain place, and the workpiece 216 is transported from another place and placed on the simple base 218 to perform vertical cutting.

  In the embodiment, the band saw blade 32 is run over the three sheaves 40, 40... Of each of the cutting units 34, 36, and the band saw blade 32 is caused to travel. The band saw blade 32 may be caused to travel by a sheave, that is, by a pair of sheaves.

  In addition, the cutting posture of the band saw type cutting device 10 is changed by the overhead crane 208. However, the band saw type cutting device 10 itself is provided with a posture changing mechanism including a jack to change the cutting posture. Also good.

The perspective view which shows the band saw type cutting device of embodiment The front view and side view of the generator stator cut | disconnected by the band saw type cutting device of FIG. Front view of a band saw type cutting device resized according to the size of the workpiece Front view showing the configuration of the cutting unit of the band saw type cutting device Perspective view showing an example of horizontal cutting by a band saw type cutting device Perspective view showing an example of vertical cutting by a band saw type cutting device Explanatory drawing which shows the cutting posture change situation of a band saw type cutting device Perspective view showing an example of vertical continuous cutting by a band saw type cutting device Perspective view of generator stator cut by a band saw type cutting device Explanatory drawing which showed other embodiment of the band saw type cutting device Explanatory drawing showing another use example of the band saw type cutting device

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Band saw type cutting device, 12 ... Drive block, 14 ... Drive block, 16 ... Upper beam, 18 ... Block main body, 20 ... Saw blade driving motor, 22 ... Running rail, 24 ... Screw jack, 26 ... Saw blade movement Motor, 28 ... block body, 30 ... saw blade tension jack, 32 ... band saw blade, 34 ... cutting unit, 36 ... cutting unit, 38 ... frame, 40 ... sheave, 42 ... rotating shaft, 44 ... frame, 46 ... Slider, 48 ... Anti-vibration member, 50 ... Arm, 52 ... Holder, 54 ... Jack, 200 ... Generator stator, 202 ... Casing, 204 ... Base, 206A, 206B ... Cut object, 208 ... Flame crane, 210 ... Height adjustment base, 212 ... Floor, 214 ... Object to be cut, 216 ... Object to be cut

Claims (4)

In a band saw type cutting device that cuts an object to be cut by running an endless band saw blade suspended between a pair of sheaves between sheaves,
The band saw-type cutting device includes: a drive block including a motor that rotationally drives one sheave of the pair of sheaves; a driven block including the other driven sheave of the pair of sheaves; the drive block; It is composed of an upper beam connecting the driven block, and the drive block, the driven block, and the upper beam are straddled across the object to be cut,
By rotating the drive block within a range of 90 degrees with a pin provided at the lower part of the leg of the drive block as a base point, the posture of the cutting means composed of the pair of sheaves and the band saw blade is cut in the vertical direction. A band saw-type cutting device that is changeable between a posture and a horizontal cutting posture.   The vertical cutting posture is a posture in which the pair of sheaves moves in the vertical direction with the rotation axis of the pair of sheaves oriented in the vertical direction, and the horizontal cutting posture is the rotation of the pair of sheaves. The band saw type cutting device according to claim 1, wherein the pair of sheaves is in a posture to move in the horizontal direction with the shaft oriented in the horizontal direction. A guide member that movably supports the cutting means;
Drive means for moving the cutting means along the guide member;
Attitude changing means for changing the attitude of the guide member in a vertical direction and a horizontal direction;
The band saw type cutting device according to claim 2, comprising: Using the band saw type cutting device according to claim 1, 2, or 3,
After holding the cutting means in a vertical cutting posture or a horizontal cutting posture and cutting the object to be cut, the cutting means is changed to a horizontal cutting posture or a vertical cutting posture to be cut. A cutting method using a band saw type cutting device characterized by cutting an object.

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