JP2020146818A - Tube body cutting apparatus - Google Patents

Abstract

To provide a tube body cutting apparatus capable of preventing generation of chips, enhancing a working efficiency and shortening an operation time when half-splitting tube bodies.SOLUTION: A tube body cutting apparatus comprises: plural circular blades 53 capable of cutting a tube body P; a blade support medium 51 rotatably supporting the plural circular blades 53, 53, respectively; and a mobile device 6 moving the blade support medium 51 or the tube body P in a longitudinal direction. The plural circular blades 53, 53 are pairs of blades 53, 53 facing each other holding the tube body P in between in a radial direction. In the blade support medium 51, a plurality of pairs of blades 53, 53 are arranged along the longitudinal direction, where the interval between the tips of the pair of blades 53, 53 facing each other narrows as heading for the movement direction of the blade support medium 51 or the tube body P.SELECTED DRAWING: Figure 7

Description

The present invention relates to a tube cutting device that cuts a tube in the longitudinal direction.

For example, in the decommissioning work of a nuclear power plant, when dismantling and removing existing equipment, the dismantled waste must be classified according to the detected radioactive contamination level and treated appropriately. It doesn't become. In particular, when dismantling and removing the tube, the degree of radioactive contamination inside the tube cannot be measured appropriately as it is, and in order to reduce the volume after dismantling, a certain diameter or more (for example, 100A). The tube body (above) is cut in half along the longitudinal direction, so-called "half split".

In the prior art of splitting a tube in half, there is a tube cutting machine that divides the tube in half by a pair of cutting disks such as tip saws facing each other (see Patent Document 1). Further, there is also a pipe body cutting machine in which a pipe body is arranged so that its longitudinal direction faces up and down, and the pipe body is divided in half by an outer first blade portion and an inner second blade portion from the upper portion thereof (Patent Document). 2).

Japanese Unexamined Patent Publication No. 2005-7843 JP-A-2018-24043

However, in the tube cutting machine described in Patent Document 1, when cutting the tube, chips to which radioactivity is attached, that is, secondary contaminants are generated.
Further, in the tube cutting machine described in Patent Document 2, chips are not generated and the above-mentioned secondary contaminants are not generated, but the length of the tube that can be cut is the tube cutting machine. Since it depends on the size of the long tube, it must be cut in advance to a length that can be cut by the tube cutting machine, which is inefficient and takes time. In the tube cutting machine described in Patent Document 2, increasing the size in order to cut a long tube does not merely change the spline shaft to a long one, but also cuts the spline shaft. In order to maintain accuracy, it is necessary to improve the holding mechanism (tube holding part), which is not realistic.

An object of the present invention is to provide a pipe body cutting device capable of suppressing the generation of chips when dividing a pipe body in half, improving work efficiency, and shortening the work time.

According to the first aspect of the present invention, it is a pipe body cutting device for cutting a pipe body, and a plurality of circular blades capable of cutting the pipe body and a blade for rotatably supporting the plurality of circular blades. A support and a moving device for moving the blade support or the tube in the longitudinal direction of the tube are provided, and each of the plurality of circular blades faces each other with the tube in the radial direction. A pair of circular blades, wherein a plurality of the pair of circular blades are arranged along the longitudinal direction in the blade support, and the blade support or the tube body is moved toward the moving direction. Arrange the pair of circular blades so that the distance between the tips facing each other is narrow.

According to the second aspect of the present invention, in the first aspect, the pair of circular blades arranged in plurality along the longitudinal direction move the blade support or the tube body by the moving device. By letting the tube body come into contact with the tube body and rotate, the amount of bite is gradually increased so that the tube body can be cut in the longitudinal direction.

According to the third aspect of the present invention, in the first aspect or the second aspect, the tube body support having a front view ∨-shaped mounting portion on which the tube body is mounted and the tube body. It is provided with a tube body pressing device that presses the tube body from above, and is configured to be able to position the tube body vertically and horizontally by sandwiching the tube body up and down by the above-mentioned placing portion and the tube body pressing device. ing.

According to the present invention, it is possible to suppress the generation of chips when cutting the tubular body in the longitudinal direction. Therefore, for example, in the decommissioning work of a nuclear power plant, chips may be generated when the pipe body is cut (half split) in the longitudinal direction for the purpose of dismantling and removing the pipe body provided in the facility. No secondary contaminants are generated.
Further, since the pipe body installed in the pipe body cutting device is positioned vertically and horizontally, it is possible to reliably cut the pipe body in the longitudinal direction only by moving the pipe body. Therefore, the work efficiency can be improved and the work time can be shortened.

It is a perspective view which looked at the tube body cutting apparatus (except for some configurations) which concerns on one Embodiment of this invention from the front upper side. It is also a front view of the tube cutting device. Similarly, it is a plan view of a tube cutting device. It is also a side view of the tube cutting device. It is also a front view of the cutter base in the tube cutting device. It is also a perspective view of the auxiliary base in the tube cutting device. Similarly, it is a plan schematic diagram for demonstrating the cutting mechanism in a tube body cutting apparatus. Similarly, it is a plan schematic diagram for demonstrating the arrangement of circular blades in the cutting mechanism of a tube body cutting apparatus. It is a schematic diagram of the tube body feeding mechanism in the tube body cutting apparatus which concerns on the modification of this invention.

Hereinafter, an embodiment of the tube cutting device 1 of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that this embodiment is an example and does not limit the present invention. Further, in the following description, the reference direction (front-back / left-right) of each part of the tube cutting device 1 is based on the front view shown in FIG. 2, that is, the viewpoint of the operator facing the front of the tube cutting device 1. The front of the worker is "front", the back is "rear", and the left and right are "left and right" (see the directions shown in FIGS. 1 to 4 and the like). Further, when specifying the position, shape, etc. of each part, when the pipe body P (including the axis of the pipe body P) described later is used as a reference, the pipe body P in the state of being installed in the pipe body cutting device 1 The side close to the circumferential direction of the pipe body P will be referred to as “inside”, and the side away from the pipe body P will be referred to as “outside” (see the directions shown in FIGS. 5 and 6 and the like).

(Tube cutting device 1)
The tube body cutting device 1 of the present embodiment makes it possible to cut the tube body P (see FIG. 1 and the like) in half along the longitudinal direction (front-back direction) (hereinafter referred to as halving). is there.
The pipe body cutting device 1 includes a base 2 for holding its constituent members in a predetermined position, a pipe body support 3 for supporting the pipe body P, a cutting mechanism 5 for dividing the pipe body P in half, and the cutting mechanism 5. A cutting mechanism support 4 that supports the cutting mechanism 5, a tube feeding mechanism 6 that moves the tube P backward (see FIGS. 3 and 4), and a tube pressing mechanism 7 that presses the upper portion of the moving tube P. (See FIGS. 3 and 4).

(Base 2)
The base 2 is formed by hanging the leg pieces 22 from the four sides of the rectangular flat plate-shaped portion 21 having a long length in the front-rear direction and from appropriate positions. The pipe body support 3, the cutting mechanism support 4, the pipe body feeding mechanism 6, and the pipe body pressing mechanism 7 are fixed at predetermined positions on the upper surface of the plate-shaped portion 21 by bolts B. In addition, in order to avoid complication, the reference numeral of the bolt B is omitted in FIG.

(Tube support 3)
As shown in FIGS. 1 to 4, the tubular body support 3 includes a mounting portion 31 on which the tubular body P is mounted, and a leg portion 32 that supports the mounting portion 31.

As shown in FIG. 2, the mounting portion 31 is a front-view ∨-shaped equilateral structure, and its dimension (length) in the front-rear direction is longer than the length of the tube body P to be cut ( For example, it is set to 3 to 4 times, preferably 3 times). Further, the mounting portion 31 is arranged at the center in the left-right direction of the tube body cutting device 1, and the internal angle portion located on the vertical line Y passing through the center O of the tube body P faces directly upward, and the tube body P is oriented. It is supported by the legs 32 in a posture of evenly supporting it.

As a result, when the tube body P is placed on the mounting portion 31, the tube body P is placed at an appropriate position in the left-right direction, that is, due to the left and right circular blades 53 described later in the cutting mechanism 5, the tube body P has an equal force on the left and right sides. The position that can be cut with, in other words, the distance from the inner end of the circular blade 53 on the right side shown in FIG. 2 to the center O of the tubular body P, and the distance from the inner end of the circular blade 53 on the left side to the center O of the tubular body P. It is easily and reliably positioned at a position equal to the distance.

As shown in FIGS. 1 and 4, each leg portion 32 projects downward from the lower surface of the mounting portion 31 and is provided at intervals in the front-rear direction. Further, each leg portion 32 has a fixing plate 33 for fixing to the base 2 by a bolt B fixed to the lower end thereof by welding.

(Cut mechanism support 4)
As shown in FIGS. 1 to 4, the cutting mechanism support 4 has a rectangular flat top plate 41 having a long length in the front-rear direction, and downwards from the front-rear end portion of the top plate 41 and the vicinity of the central portion in the front-rear direction. It has a plurality of projecting legs 42. A fixing plate 43 for fixing to the base 2 by bolts B is fixed to the lower end of each leg 42 by welding. A cutting mechanism 5, a base adjusting mechanism 57, and the like are fixed to a predetermined position on the upper surface of the top plate 41 by bolts B and the like.

(Cut mechanism 5)
As shown in FIG. 3, the cutting mechanism 5 is composed of a pair of left and right cutter units 50, 50 arranged so as to face each other with the pipe body support 3 interposed therebetween. The cutter units 50 and 50 are symmetrical with respect to the axis of the tubular body P and have a symmetrical shape and structure. In the following description, only the one on the right side will be described.

(Cutter unit 50)
The cutter unit 50 is a blade support of the present invention, and includes two types of cutter bases 51 having different shapes and dimensions, and a circular blade 53 rotatably supported by the cutter base 51 on a vertical axis 52 in the vertical direction. A base adjusting mechanism 57 for adjusting the movement of the cutter base 51 in the left-right direction is provided.

The cutter base 51 is continuously arranged separately from the main body base 51A having a rectangular block shape that is long in the front-rear direction and behind the main body base 51A, and is a rectangular block that is shorter in the front-rear direction than the main body base 51A. It is composed of a rectangular auxiliary base 51B.

A plurality of circular blades 53 (first blades 53a to tenth blades 53j in FIG. 7) are arranged in a row in the front-rear direction on the main body base 51A. A single circular blade 53 (11th blade 53k) is arranged on the auxiliary base 51B so as to be aligned with the plurality of circular blades 53 of the main body base 51A.
The number of circular blades 53 of the main body base 51A is determined based on the material, thickness, and the like of the tube body P. The number of circular blades 53 of the auxiliary base 51B may be plural.

As shown in FIGS. 5 and 6, the circular blade 53 has a circular blade portion 53A in a plan view and a tubular portion 53B in the vertical direction through which the vertical axis 52 is inserted. The circular blade 53 is made of high-strength special steel.

As shown in FIGS. 5 and 6, the circular blade 53 is rotatably supported by the cutter base 51 by the vertical axis 52. The vertical axis 52 includes a shaft portion 52a that can be inserted into the tubular portion 53B of the circular blade 53, a diameter-expanded head 52b that is provided above the shaft portion 52a and has a larger diameter than the shaft portion 52a, and a diameter-expanded head. One side end of the portion 52b is composed of a notch portion 52c notched in an L-shape in front view. The notch 52c has an upper surface 52d and a side surface 52e that are pressed against a pressing plate 56c described later.

The main body base 51A and the auxiliary base 51B have the same basic configuration except for the dimensions in the front-rear direction and the number of circular blades 53 to be attached. Therefore, the following main body base 51A and the auxiliary base 51B have a common configuration. The description of the above will be described as the cutter base 51, and the main body base 51A and the auxiliary base 51B will be described individually as needed.

As shown in FIGS. 5 and 6, the inside of the cutter base 51 is formed together with the closing plate 56 described later, and a part (inner end portion) of the horizontal circular blade 53 is exposed inward and rotated. A blade mounting area 54 that supports the blade is provided.

The blade mounting area 54 includes a housing portion 55 in which the inner portion of the cutter base 51 is formed in a substantially inverted L shape when viewed from the front, and a bolt B on the upper surface of the cutter base 51 so as to close the upper portion of the housing portion 55. It has a substantially U-shape in front view due to the closing plate 56 provided so as to be detachable. The closing plate 56 is provided for each of the main body base 51A and the auxiliary base 51B, and has a rectangular flat plate shape having the same dimensions as the front-rear dimensions of the main body base 51A and the auxiliary base 51B.

As shown in FIG. 5, the bottom surface 55a of the accommodating portion 55 is provided with a fitting hole 55b into which the lower end portion of the shaft portion 52a on the vertical axis 52 can be fitted. The number of fitting holes 55b is the same as that of the circular blade 53, that is, a plurality of fitting holes 55b are provided in the accommodating portion 55 of the main body base 51A at equal intervals in the front-rear direction (for example, 10), and 1 in the accommodating portion 55 of the auxiliary base 51B. Each of the fitting holes 55b is provided.

As shown in FIG. 5, the closing plate 56 is formed with an insertion hole 56a through which the shaft portion 52a of the vertical axis 52 can be inserted, and an insertion hole 56a that is continuously formed above the insertion hole 56a, and has a larger diameter than the insertion hole 56a. A diameter groove portion 56b is provided. The lower end of the enlarged diameter head 52b on the vertical axis 52 can be fitted into the enlarged groove portion 56b.

Further, as for the closing plate 56, a holding plate 56c for fixing the vertical axis 52 to the blade mounting area 54 can be attached by the bolt B. Specifically, the holding plate 56c presses the upper surface 52d and the side surface 52e of the notch 52c of the vertical axis 52 inserted into the insertion hole 56a of the closing plate 56 against the closing plate 56, and the vertical axis 52 is the closing plate 56. It can be fixed to.

As shown in FIGS. 1 and 3, the shape of the holding plate 56c differs depending on the type of cutter base 51 to be attached (main body base 51A or auxiliary base 51B).
Specifically, the presser plate 56c of the main body base 51A has a rectangular flat plate shape that is longer in the front-rear direction than the presser plate 56c of the auxiliary base 51B, and for example, two vertical axes 52 and 52 arranged in the front-rear direction are cut. The notches 52c and 52c are pressed at once, and the two vertical axes 52 and 52 are fixed to the accommodating portion 55 (see FIG. 5). On the other hand, the pressing plate 56c of the auxiliary base 51B has a rectangular flat plate shape shorter in the front-rear direction than the pressing plate 56c of the main body base 51A, and for example, one notch portion 52c of the vertical axis 52 is pressed against the one. The vertical axis 52 is fixed to the accommodating portion 55 (see FIG. 5).

With the above configuration, in order to attach the circular blade 53 to the blade mounting area 54, first, the shaft portion 52a of the vertical axis 52 is inserted into the insertion hole 56a and the diameter-expanded groove portion 56b from above the closing plate 56. Next, with the shaft portion 52a inserted through the tubular portion 53B of the circular blade 53, the lower end portion of the shaft portion 52a is fitted into the fitting hole 55b of the accommodating portion 55. Finally, the pressing plate 56c is pressed against the upper surface 52d and the side surface 52e of the notch 52c of the enlarged diameter head 52b fitted in the enlarged groove portion 56b to be fixed to the closing plate 56, and the vertical axis 52 is the blade. It is fixed to the mounting area 54.

As shown in FIGS. 2, 3, 5, and 6, the cutter base 51 is provided with elongated holes 51c long in the left-right direction through which the positioning bolt 58 can be inserted. The positioning bolt 58 has a handle portion 58a that can be gripped by an operator, and can be tightened and loosened without using a tool. The positioning bolt 58 inserted through the elongated hole 51c allows the cutter base 51 to be fixed to the top plate 41 of the cutting mechanism support 4 while adjusting its position in the left-right direction without using a tool.

As shown in FIG. 3, in the main body base 51A, one elongated hole 51c is provided in each of the front side portion and the rear side portion, and in the auxiliary base 51B, one is provided substantially in the center in the front-rear direction. .. Therefore, the main body base 51A can adjust not only the distance but also the angle with respect to the pipe body P of the main body base 51A itself by adjusting the front and rear two positions. Further, the auxiliary base 51B can adjust the distance of the auxiliary base 51B itself to the pipe body P.

(Base adjustment mechanism 57)
The base adjustment mechanism 57 can move the main body base 51A and the auxiliary base 51B independently in the left-right direction, respectively, and has a long rectangular block-shaped adjustment plate portion 57a and an adjustment plate portion 57a in the front-rear direction. It is composed of an adjusting bolt 59 that can be screwed from the outside to the inside.

As shown in FIGS. 1 to 3, the adjusting plate portion 57a is slightly longer than the sum of the longitudinal dimensions of the main body base 51A and the auxiliary base 51B arranged continuously in the front-rear direction, and the tubular body P. It is fixed to the outer end of the top plate 41 of the cutting mechanism support 4 by a bolt B so as to be parallel to the axis of. Further, as shown in FIG. 2, the adjusting plate portion 57a is provided with an adjusting hole 57b penetrating in the left-right direction through which the adjusting bolt 59 can be inserted, and is provided on the outside of the adjusting hole 57b (outer surface of the adjusting plate portion 57a). A nut 57c into which the adjusting bolt 59 can be screwed is fixed by welding. The adjusting holes 57b are provided at positions facing each of the elongated holes 51c of the main body base 51A and the auxiliary base 51B.

The adjusting bolt 59 has a handle portion 59a that can be gripped by an operator, and can be tightened and loosened without using a tool. The adjusting bolt 59 can be inserted into the adjusting hole 57b in a state of being screwed into the nut 57c of the adjusting plate portion 57a from the outside, and further tightened or loosened to advance or retreat the tip thereof.

As a result, while the cutter base 51 with the positioning bolt 58 loosened is movable, the adjustment bolt 59 is tightened so that the tip thereof protrudes from the inside of the adjustment plate portion 57a, and the front side portion of the outer surface of the main body base 51A and the like. The positions (movement inward) of the main body base 51A and the auxiliary base 51B can be appropriately adjusted by bringing them into contact with the rear side portion and the central portion of the outer surface of the auxiliary base 51B and pushing them in. In particular, in the long body base 51A, the angle with respect to the tube body P can be finely adjusted.

In this way, the base adjusting mechanism 57 adjusts the distance between the main body base 51A and the auxiliary base 51B in the left-right direction to the circular blades 53, which are continuously arranged along the tube body P. The position of the blade portion 53A of 53 can be appropriately adjusted.

Regarding the movement of the main body base 51A and the auxiliary base 51B to the outside, the adjusting bolt 59 is loosened while the main body base 51A and the auxiliary base 51B are movable, and the tip thereof is the outer surface of the main body base 51A and the auxiliary base 51B. The main body base 51A and the auxiliary base 51B itself may be gripped and moved outward in a state of being separated from the main body base 51A.

The base adjusting mechanism 57 may be provided for each of the main body base 51A and the auxiliary base 51B. Further, the base adjusting mechanism 57 may be provided at a position facing the positions of the elongated holes 51c of the main body base 51A and the auxiliary base 51B, respectively, with the adjusting plate portion 57a having a short size.

(Tube feed mechanism 6)
As shown in FIGS. 3 and 4, the tubular body feeding mechanism 6 which is the moving device of the present invention has a main body 60 which is a hydraulic jack capable of pressing the tubular body P rearward and a support portion which supports the main body 60. It is composed of 61 and a plurality of extension adapters 62 that can be connected to the main body 60 and that compensate for the lack of stroke of the main body 60 to press the tube P. Since the stroke of the main body 60 of the tube feed mechanism 6 is shorter than the length that can completely divide the tube P in half, an extension adapter 62 having an appropriate length is connected each time the tube P moves by pressing. Further, the tube body P is pressed.

A fixing plate 63 that can be fixed to the base 2 by bolts B is fixed to the lower end of the support portion 61 by welding.

(Tube holding mechanism 7)
The tubular body pressing mechanism 7, which is the tubular body pressing device of the present invention, enables the vertical positioning of the tubular body P, and as shown in FIG. 2, has a shaft portion 71 in the horizontal direction and a cylindrical shaft. A pressing roller 72 rotatably supported by the portion 71 and a pair of left and right leg portions 73, 73 supporting both ends of the shaft portion 71 are provided, and are configured to have a front view gate type.

As shown in FIGS. 3 and 4, the tubular body pressing mechanism 7 is provided immediately before the cutting mechanism 5, and the left and right leg portions 73 and 73 have both ends of the shaft portion 71 in the vertical direction at the upper ends thereof. A U-shaped bearing portion 73a, 73a in a side view that slidably supports the bearing portion 73a, a holding piece 73b, 73b that closes the open upper portion of the bearing portion 73a, and a handle portion 74a that can be gripped by an operator. It has adjusting bolts 74 and 74 in the vertical direction.

The adjustment bolt 74 can be tightened and loosened by the handle portion 74a without using a tool. By screwing the adjusting bolt 74 into the screw hole (not shown) of the holding piece 73b and letting the tip of the adjusting bolt 74 enter the bearing portion 73a, the position where the tip abuts on the upper ends of both ends of the shaft portion 71 is determined by the shaft portion. It can be set as the upper limit movable position of 71 (pressing roller 72). By setting the upper limit movable position of the shaft portion 71 (pressing roller 72), when the tubular body P is cut, the pressing roller 72 and the mounting portion 31 of the above-mentioned tubular body support 3 sandwich the tubular body P from above and below. It is possible to position P in the vertical direction.

The shaft portion 71 is located at the initial position of the lower end of the bearing portion 73a due to its own weight with the pressing roller 72 when the tubular body P does not pass through the tubular body pressing mechanism 7. Further, the shaft portion 71 is pushed up to the upper limit movable position adjusted by the adjusting bolt 74 because the holding roller 72 is pushed up by the pipe body P in the state where the pipe body P has passed through the pipe body holding mechanism 7. Therefore, when the tubular body P passes through the tubular body pressing mechanism 7, the tubular body P is sandwiched from above and below by the pressing roller 72 and the mounting portion 31 of the tubular body support 3, and the tubular body P is vertically and vertically sandwiched. Directional positioning is done.

With such a configuration, the pipe body pressing mechanism 7 can be tightened and loosened by the adjusting bolt 74 having the handle portion 74a without using a tool, and the upper limit movable position of the pressing roller 72 can be set. The pipe body P can be positioned in the vertical direction according to the outer diameter of the body P (see FIG. 2).

A fixing plate 75 that can be fixed to the base 2 by bolts B is fixed to the lower ends of the left and right legs 73 by welding.

The pipe body cutting device 1 is provided with the above-mentioned constituent members, is compact, and can perform half-splitting work of the pipe body P in a space-saving manner.

(Position adjustment of cutter base 51)
For example, in the decommissioning work of a nuclear power plant where many pipes are arranged, the pipes are half-sized in order to properly measure the degree of radioactive contamination inside the pipes and to reduce the volume of the pipes. The process of dividing is required. However, if chips are generated when the pipe is split in half, or if a cutting method that requires water for cutting is adopted, secondary contaminants such as chips and water with radioactivity will be generated. , Such cutting techniques should be avoided. In addition, since the work site where the pipe body is split in half is often a radioactive contamination control area, it is cut as quickly as possible from the viewpoint of reducing the exposure of workers and to ensure the safety of workers. It is desirable to be able to do it.

Based on such a problem, in the present embodiment, when the pipe body P is divided in half, the pipe body P is passed between the left and right cutter units 50, 50, and the left and right cutter units 50, 50 are moved in the front-rear direction. A plurality of continuous circular blades 53, 53 rotate in contact with the tube body P, and the amount of bite of the blade portions 53A, 53A is gradually increased, so that the tube body P is finally cut (. I'm trying to push it all the way down.

In order to realize this method, the position of the cutter base 51 is adjusted by the base adjusting mechanism 57, so that the angle of the cutter base 51 with respect to the pipe body P is set in the moving direction of the pipe body P (posterior) as shown in FIG. It can be set to gradually approach the tube P as it goes toward the side).

As a result, the pair of circular blades 53, 53 on the rear side of the distance between the inner ends of the respective blade portions 53A, 53A of the pair of left and right circular blades 53, 53 (for example, the first blades 53a, 53a) (For example, the distance between the inner ends of the blade portions 53A and 53A of the second blades 53b and 53b) can be narrowed.
In other words, in the left and right cutter bases 51 and 51, the width between the tangents L1 and L1 connecting the inner ends of the circular blades 53 and 53 (blade portions 53A and 53A) arranged in the front-rear direction can be tapered. Yes (see Figure 7).

As shown in FIG. 8, in the present embodiment, for example, the pair of left and right circular blades 53, 53 has a dimension D (for example, 0.05 mm to 0) as compared with the one arranged on the rear side and the one arranged on the front side. It is arranged at a position shifted inward by .80 mm, 0.5 mm in the following description). This distance is set based on the results of the inventor's experiment.

Specifically, for example, in the circular blades 53 of the main body bases 51A and 51A, the inner ends of the blade portions 53A and 53A are 0.5 mm from the left and right side surfaces of the tube body P with the front first blades 53a and 53a. The second blades 53b and 53b are 1 mm each, the third blades 53c and 53c are 1.5 mm each, the fourth blades 53d and 53d are 2 mm each, and the fifth blades 53e and 53e are 2.5 mm each. The 6th blades 53f and 53f are 3 mm each, the 7th blades 53g and 53g are 3.5 mm each, the 8th blades 53h and 53h are 4 mm each, and the 9th blades 53i and 53i are 4.5 mm each. The blades 53j and 53j are also set to be 5 mm each so as to be close to the axis of the tubular body P (so as to bite into the left and right side surfaces of the tubular body P).

As a result, in the sections of the main body bases 51A and 51A of the cutter units 50 and 50, the passing pipe body P (for example, 5 mm thick) is pushed off by increasing the biting amount by 0.5 mm for each pair of circular blades 53. It can be finally divided in half.

Further, the pair of 11th blades 53k and 53k of the auxiliary bases 51B and 51B, the blade portions 53A and 53A, are set at positions shifted inward by dimension D (for example, 0.5 mm) from the 10th blades 53j and 53j. ing.

Specifically, for example, in the 11th blades 53k and 53k of the auxiliary bases 51B and 51B, the inner ends of the blade portions 53A and 53A are 5.5 mm from the left and right side surfaces of the pipe body P, respectively. It is set so as to approach the axis line (position that bites into the left and right side surfaces of the tube body P).

With the auxiliary bases 51B and 51B, when the tubular body P is slightly thick due to a manufacturing error or the like, it is possible to cut a portion of the main body bases 51A and 51A that cannot be pushed through and has a thin skin.

As described above, the auxiliary bases 51B and 51B are provided separately from the main body bases 51A and 51A, and their positions can be adjusted independently by the base adjustment mechanism 57. Therefore, the circular blades 53 and 53 of the main body bases 51A and 51A Positioning may be performed independently of the arrangement (eg, beyond the range of 0.05 mm to 0.80 mm). In order to reliably cut, for example, the blade portions 53A and 53A of the eleventh blades 53k and 53k may be adjusted so as to be displaced inward by 1.0 mm from the tenth blades 53j and 53j.

With the above configuration, the tubular body P can be cut in half along the longitudinal direction without generating secondary contaminants such as chips. Further, the pipe body P can be cut by passing between the left and right cutter units 50 and 50 only once, and the work efficiency can be improved and the work time can be shortened.

(Half division process of tube body P)
Next, the process of dividing the tube body P in half will be described.

As a premise, the cutting mechanism 5 of the present embodiment is adjusted according to the height of the pipe body P mounted on the pipe body support 3. As a result, the tubular body P mounted on the tubular body support 3 is placed at an appropriate position in the vertical direction (the position where the horizontal line X connecting the inner ends of the circular blades 53 facing each other passes through the center O of the tubular body P). Arranged (see Figure 2).

First, the tubular body P is placed on the tubular body support 3, and the tubular body feeding mechanism 6 is operated to press the tubular body P backward.
When the tube body P is pressed backward by the tube body feeding mechanism 6 while being mounted on the tube body support 3, the tube body P moves rearward, the lower part is supported by the tube body support 3, and the tube is supported. The upper part is pressed by the body pressing mechanism 7 and introduced into the cutting mechanism 5 (see FIG. 3).

In this way, by placing the tubular body P on the tubular body support 3, it is possible to position the tubular body P at an appropriate position in the left-right direction, and by the tubular body pressing mechanism 7, the tubular body P can be positioned at an appropriate position in the vertical direction. It can be positioned.
Therefore, before the pipe body P is introduced into the cutting mechanism 5, the horizontal line X connecting the inner ends of the circular blades 53 facing each other passes through the center O of the pipe body P at a position equally divided vertically by the cutting mechanism 5. It is in a ready state where it can be cut with equal force on the left and right (see FIG. 2).

The tube body feeding mechanism 6 pushes the tube body P in the prepared state backward to proceed to the cutting step.
First, the first blades 53a and 53a of the main body bases 51A and 51A have dimensions D (for example, 0.5 mm) on both the left and right sides of the tube P, which are pressed by the tube feed mechanism 6 and have entered the cutting mechanism 5. ) Push through. Subsequently, the second blades 53b, 53b further push through the loci (grooves) on both the left and right sides that have been pushed off by the first blades 53a, 53a, by dimension D (for example, 0.5 mm). Then, the circular blade 53 on the rear side pushes the locus pushed by the immediately preceding circular blades 53, 53 step by step by dimension D (for example, 0.5 mm), and finally cuts into a half-split state. That is, at the first blades 53a and 53a to the tenth blades 53j and 53j, the amount of biting into the tubular body P is gradually increased to cut the tubular body P.
The tubular body P that has not been cut in the section of the main body base 51A is cut by the 11th blades 53k and 53k of the auxiliary bases 51B and 51B immediately after the main body base 51A.

In this way, if the thickness of the tubular body P is "dimension D (for example, 0.5 mm) x number of circular blades 53 (for example, 10)" or less (for example, 5 mm), the tenth blades 53j and 53j are used. When it passes, it is cut in half. Further, due to a manufacturing error, for example, even if the wall thickness is slightly thicker than 5 mm and the cutting is not performed by the 10th blades 53j and 53j, when the 11th blades 53k and 53k of the auxiliary bases 51B and 51B are passed, It is cut in half.

With the above configuration, the tube body P can be split in half without generating chips by simply placing the tube body P on the tube body support 3 and moving the tube body P. That is, the pipe body P can be easily divided in half without depending on the skill of the operator. Further, since the pipe body P is positioned at an appropriate position in the vertical and horizontal directions and cut, even if the pipe body P is long, it is surely true along the longitudinal direction by moving the pipe body P once. Can be cut in half. That is, in the half-splitting work of the pipe body P, the work efficiency can be improved and the work time can be shortened.

Although the embodiments of the present invention have been described above, the following modifications and modifications can be made to the above-described embodiments without departing from the gist of the present invention. In addition, the above-described embodiment of the present invention and the respective constituent members, treatments, conditions, and the like in the following modifications can be appropriately combined.

[Modification example of tube feed mechanism]
As a mechanism capable of pressing the pipe body P, a second pipe body feed mechanism 8 to which a screw screw is applied may be adopted.
Specifically, as shown in FIG. 9, the second tube feeding mechanism 8 is a ball screw mechanism, which is a screw shaft 81 having a length longer than the length of the cutting mechanism 5 in the front-rear direction and a drive source. The first gear box 82 for accommodating the motor M and a conversion gear (not shown, for example, a helical gear) for converting the power direction of the motor M and the arm portion 83a for pushing out the tube body P have different amounts of protrusion to the rear. It includes an extrusion section 83A and a second extrusion section 83B.

The gear box 82 is fixed to the upper surface of the cutting mechanism support 4 immediately before the cutting mechanism 5 by bolts or the like (not shown). In the gearbox 82, the motor M is connected to the conversion gear, and the conversion gear meshes with the screw shaft 81.
As a result, the screw shaft 81 is sent forward or backward by the forward rotation or the reverse rotation of the motor M.

The first extruded portion 83A and the second extruded portion 83B have an arm portion 83a projecting rearward at right angles to the screw shaft 81, and an extruded piece 83b provided on the rear end surface of the arm portion 83a. The first extruded portion 83A has an arm portion 83a having a large amount of protrusion to the rear, and is detachably attached to the front end of the screw shaft 81. The second extruded portion 83B has an arm portion 83a having a small amount of protrusion to the rear, and is detachably attached to the rear end of the screw shaft 81. The first extrusion section 83A is attached to move the tubular body P (see FIG. 9A) in the initial position rearward, and the second extrusion section 83B is completely moved by the first extrusion section 83A. The pipe P (see FIG. 9B) is attached to move it further backward.

Next, with reference to FIG. 9, the flow in which the second tubular body feeding mechanism 8 moves the tubular body P will be described.
First, the first extrusion portion 83A is attached to the front end of the screw shaft 81 (see FIG. 9A). By rotating the motor M in the normal direction and feeding the screw shaft 81 backward, the first extrusion portion 83A pushes the tubular body P at the initial position shown in FIG. 9A backward (FIG. 9B). reference). After the screw shaft 81 is pushed out to the maximum by the motor M, the motor M is reversed to return the screw shaft 81 to the initial position shown in FIG. 9A.
Next, the second extruded portion 83B is attached to the rear end of the screw shaft 81 that has returned to the initial position (see FIG. 9C). By rotating the motor M in the normal direction again and feeding the screw shaft 81 backward, the second extrusion portion 83B pushes the pipe body P moved halfway further backward (see FIG. 9D). The pipe body P is completely cut by pushing out the screw shaft 81 to the maximum by the motor M.
The pipe body feeding mechanism is not limited to the hydraulic jack and the screw jack described above, and exerts a pressing force in the horizontal direction that allows the pipe body P to be introduced into the cutting mechanism 5 and passed through. Other feed mechanisms such as pantograph jacks may be used.

[Modification example of circular blade]
Some circular blades 53 may have different blade shapes. For example, the blade portion of a part of the circular blade may be a lead-in blade having a concave groove such as a plan view ∨ type. The lead-in blade is arranged in front of the other circular blade 53 so as to be relatively non-rotatable with a fixed shaft, and the fixed shaft is rotated by a driving means (for example, a motor) to scrape the tubular body P. Then, you may pull it backward. As a result, while pushing off a part of the tubular body P, the tubular body P is assisted in pressing the tubular body P backward by the tubular body feeding mechanism 6, or the tubular body P is pushed backward without using the tubular body feeding mechanism 6. Can be moved.

Further, the angle of the tangent line L1 (see FIG. 7) connecting the inner ends of the circular blades 53, 53 arranged in the front-rear direction may be adjusted so that the circular blade 53 itself can move in the left-right direction.
For example, the fitting hole 55b of the accommodating portion 55 of the blade mounting region 54, the insertion hole 56a of the closing plate 56, and the diameter-expanded groove portion 56b are each elongated in the left-right direction, and are vertically inserted into these holes 55b, 56a, 56b. By making the shaft 52 movable in the left-right direction, the circular blade 53 itself can be moved in the left-right direction.
In this case, male threads are provided at the upper end and the lower end of the vertical axis 52, the upper end of the vertical axis 52 after movement is fixed to the closing plate 56, and the lower end is fixed to the bottom surface 55a of the accommodating portion 55 with a nut. , The vertical axis 52 is fixed to the blade mounting area 54.

Further, circular blades 53 having different diameters are rotatably provided on a vertical axis 52 which is continuously arranged so as to be parallel to the axis of the tubular body P, and a tangent line L1 (which connects the inner ends of each circular blade 53). The angle of (see FIG. 7) may be adjusted. Specifically, the circular blade 53 is attached to the cutter base 51 parallel to the tubular body P so that the diameter becomes larger with a certain size (for example, 0.5 mm each) toward the rear side.

[Modification example of base adjustment mechanism]
Even if the angle of the tangent line L1 (see FIG. 7) connecting the inner ends of the circular blades 53 and 53 arranged in the front-rear direction can be automatically adjusted according to the outer diameter and thickness of the tubular body P. Good.
Specifically, a detection sensor that detects the outer diameter and thickness of the pipe body P mounted on the pipe body support 3, a control unit that performs predetermined arithmetic processing based on the detection signal of the detection sensor, and a control unit. An adjustment mechanism (including an adjustment bolt 59 and a motor for rotating the adjustment bolt 59) for adjusting the left-right position (including an angle) of the cutter base 51 according to an instruction from the control unit is provided, and the outside of the tubular body P. The left and right positions (including angles) of the cutter base 51 are automatically adjusted according to the diameter and thickness.

[Transformation example of base]
The plate-shaped portion 21 of the base 2 may be used as a punching metal to reduce the weight, and the holes formed in the vertical direction may be used as insertion holes for bolts B and the like. As a result, the size and installation position of the pipe body support 3, the cutting mechanism support 4, the pipe body feed mechanism 6, etc. to be installed on the base 2 can be freely changed. For example, the length of the pipe body P, etc. The installation position of each component can be appropriately changed according to the above.

Further, the base 2 may be provided with casters that allow the base 2 to be moved. As a result, the tube cutting device 1 can be moved, and the work efficiency can be improved.

Further, the base 2 may be provided with a height adjusting mechanism (not shown) for adjusting the height. For example, the base 2 can be raised and lowered with a screw jack or the like. As a result, the height of the entire tube cutting device 1 can be adjusted according to the body of the worker, so that the work efficiency can be improved.

[Modification example of cutting mechanism support]

On the upper surface of the top plate 41 of the cutting mechanism support 4, a scale is provided so that the positions of the main body base 51A and the auxiliary base 51B can be confirmed at the portion where the cutter base 51 of the cutting mechanism 5 can be exposed without overlapping. You may. As a result, the positions of the main body base 51A and the auxiliary base 51B can be easily adjusted while observing the scale.

Further, the cutting mechanism support 4 may be provided with a height adjusting mechanism (not shown) for adjusting the height. For example, the cutting mechanism support 4 can be raised and lowered with a screw jack or the like. As a result, the height of the circular blade 53 of the cutting mechanism 5 can be adjusted, and by adjusting the height according to the outer diameter of the pipe body P, it can be easily and surely positioned at an appropriate position in the vertical direction. Can be done.

[Other variants]
A configuration other than the tube feeding mechanism 6 of the tube cutting device 1 may be connected to the rear portion of the tube cutting device 1.

Further, the cutting mechanism 5 is attached to a rail in the front-rear direction that allows movement in the front-rear direction, and the cutting mechanism 5 (cutter base 51) is moved rearward by a driving means (moving device) to move the pipe in the front-rear direction. The body P may be cut.

1 Tube cutting device 2 Base 3 Tube support 4 Cutting mechanism Support 5 Cutting mechanism 6 Tube feeding mechanism 7 Tube holding mechanism 8 Second tube feeding mechanism 21 Plate-shaped part 22 Leg piece 31 Mounting part 32 Legs Part 33 Fixed plate 41 Top plate 42 Leg 43 Fixed plate 50 Cutter unit 51 Cutter base 51A Main body base 51B Auxiliary base 51c Long hole 52 Vertical axis 52a Shaft 52b Expanded head 52c Notch 52d Top 52e Side 53 Circular blade 53A Blade 53B Cylindrical 54 Blade mounting area 55 Accommodating 55a Bottom 55b Fitting hole 56 Closing plate 56a Insertion hole 56b Expanded groove 56c Pressing plate 57 Base adjustment mechanism 57a Adjusting plate 57b Adjusting hole 58 Positioning bolt 58a Handle Part 59 Adjustment bolt 59a Handle part 60 Main body part 61 Support part 62 Extension adapter 63 Fixing plate 71 Shaft part 72 Presser roller 73 Leg part 73a Bearing part 73b Presser piece 74 Adjustment bolt 74a Handle part 81 Thread shaft 82 Gear box 83 Extrusion Part 83a Arm part 83b Extruded piece B Bolt L1 tangent M Motor P Tube

Claims (3)

With multiple circular blades that can cut the tube,
A blade support that rotatably supports the plurality of circular blades, and
The blade support or the moving device for moving the pipe body in the longitudinal direction of the pipe body is provided.
Each of the plurality of circular blades is a pair of circular blades that face each other with the tubular body interposed therebetween in the radial direction.
In the blade support, a plurality of the pair of circular blades are arranged along the longitudinal direction, and the pair of circular blades are arranged with each other in the moving direction of the blade support or the tube. A tube cutting device characterized in that it is arranged so that the distance between opposing tips is narrowed. The pair of circular blades arranged in plurality along the longitudinal direction are stepwise while being in contact with the pipe body and rotating by moving the blade support or the pipe body by the moving device. The tube cutting device according to claim 1, wherein the tube is arranged so that the tube can be cut in the longitudinal direction by increasing the amount of biting into the tube. A tube support having a front view ∨-shaped mounting portion on which the tube is mounted, and a tube support.
It is equipped with a tube holding device that presses the tube from above.
The tube cutting device according to claim 1 or 2, wherein the tube body is sandwiched between the top and bottom by the above-mentioned placing portion and the tube body pressing device, and the tube body can be positioned vertically and horizontally.

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