JP6993341B2 - Tube cutting machine - Google Patents

Description

The present invention relates to, for example, a pipe cutting machine used as a traveling cutting machine in a pipe making line. More specifically, a milling cutter is used for a rotary saw blade, and the rotary saw blade is rotated and perpendicular to the pipe. It relates to a pipe cutting machine that moves in a plane and cuts the pipe. The pipe cutting machine here includes a stationary type as well as a traveling type. Further, in the following description, the plane perpendicular to the pipe to be cut is referred to as an xy plane.

In the pipe making line, a traveling cutting machine is used to cut continuously manufactured pipes to a fixed size. The traveling cutting machine cuts the pipe by moving the rotary saw blade in a plane perpendicular to the pipe while traveling in synchronization with the manufactured pipe.

As such a pipe cutting machine, Patent Document 1 discloses a cutting machine of a type in which a plurality of rotary saw blades are rotated and swiveled along the outer peripheral surface of the pipe. The cutting method here is called a revolution type because the swirling movement of the rotary saw blade in the tube circumferential direction is a revolution motion. Among the revolution types, the rotary saw blade is moved in the biaxial direction of xy. It is called the xy method because it controls the position.

As a revolving cutting method other than the xy method, a swing arm supporting a rotary saw blade at the tip is attached at a plurality of positions in the circumferential direction of the face plate through which the pipe penetrates, and the swing angle of the swing arm and the face plate are used. The θ-θ method that controls the rotation angle of the rotary saw blade, and the rotary saw blade that can be moved radially to multiple positions in the circumferential direction of the face plate through which the pipe penetrates, with the radial position of the rotary saw blade and the rotation angle of the face plate. There is an R-θ method that controls.

The advantage of the revolution type cutting machine is that high-speed cutting can be performed by the rotary saw blade having a relatively small diameter with respect to the pipe diameter and the small moving stroke of the rotary saw blade. Because of this advantage, the revolving cutting machine is used as a traveling cutting machine in a pipe making line as well as a stationary cutting machine.

Japanese Patent No. 3422576

The disadvantage of the revolving saw blade is that it is necessary to control the position of multiple rotary saw blades in two directions on the xy plane, which complicates and increases the size of the drive mechanism and position control mechanism, and inevitably increases the weight. It is bulky, costly, and may be prone to failure.

In addition to the revolution type, there is also a straight-line type (R method) in which one rotary saw blade is rotated and linearly moved in the radial direction of the pipe. Although the structure is simple, since the radius of the rotary saw blade must be sufficiently larger than the diameter of the pipe, there is a problem that the cutting accuracy is lowered due to the increase in the diameter of the rotary saw blade.

An object of the present invention is to provide a tube cutting machine capable of cutting a large-diameter tube accurately and efficiently in a short time, and having a simple structure, a small size, a light weight, economical efficiency, and excellent durability.

In order to achieve the above object, the pipe cutting machine of the present invention is a stationary or traveling type pipe cutting machine that cuts a pipe at a right angle to its center line.
A pair of rotations arranged so that the cutting edges overlap in the x-axis direction on both sides of the y-axis, with the plane perpendicular to the center line of the pipe to be cut as the xy plane and the center of the pipe as the origin of the coordinates. With a saw blade,
A linear drive mechanism that drives the pair of rotary saw blades in the opposite direction in the y-axis direction so that the pair of rotary saw blades pass each other on and near the x-axis.
In order to avoid interference with the cutting edge when the pair of rotary saw blades pass each other on or near the x-axis, a part of the linear driving force in the y-axis direction is changed in the x-axis direction to at least the pair of rotary saw blades. It is provided with a power direction changing mechanism that moves one side away from the y-axis.

In the pipe cutting machine of the present invention, a pair of rotary saw blades arranged to face each other on both sides of the y-axis in the xy-plane so that the cutting edges overlap in the x-axis direction travel straight in the opposite direction in the y-axis direction. Driven. Further, when a pair of rotary saw blades pass each other on or near the x-axis, a part of the linear driving force in the y-axis direction is converted in the x-axis direction, and the pair of rotary saw blades move away from the y-axis. That is, by moving away from each other to the outside, interference between the cutting edges of the pair of rotary saw blades is avoided. In the pipe cutting machine of the present invention, the power direction changing mechanism is a pair of a saw blade urging mechanism that urges at least one of a pair of rotary saw blades inward toward the y-axis and holds the saw blade urging mechanism in the inner movement limit. It includes a guide mechanism that retracts and moves at least one of the pair of rotary saw blades to the outside against the urging force when the rotary saw blades pass each other on or near the x-axis. The saw blade urging mechanism is an elastic member that elastically presses and holds at least one of the pair of rotary saw blades to the inner movement limit, or fluid at least one of the pair of rotary saw blades to the inner movement limit. It is a pressing mechanism by fluid pressure that presses and holds by pressure. The guide mechanism includes an outwardly convex curved guide. The rotary saw blade is driven by a hydraulic motor. The hydraulic motor is directly connected to the rotary saw blade. The tube cutting machine of the present invention further includes a front clamp and a rear clamp that are arranged on the front side and the back side of the cutting surface by a pair of rotary saw blades to fix the tube, respectively. The rear clamp clamps the pipe in the y-axis direction, which is the linear driving direction of the rotary saw blade. Both the front clamp and the rear clamp clamp the pipe in the y-axis direction, which is the linear driving direction of the rotary saw blade. The tube cutting machine of the present invention includes a chip collecting box that collects chips generated by cutting the tube by covering the moving area of the pair of rotary saw blades. The chip collection box has an opening / closing door for opening / closing the opening on the front side, and the opening / closing door supports the front clamp.

The pipe cutting machine of the present invention drives a pair of rotary saw blades arranged so that the cutting edges overlap in the x-axis direction on both sides of the y-axis in the xy-plane in the opposite direction in the y-axis direction. At the same time, since the interference of the cutting edge is avoided by utilizing the linear driving force in the y-axis direction, it is possible to cut a relatively large-diameter tube efficiently and with high accuracy in a short time. Moreover, since the structure is simple, it is small and lightweight, and is excellent in economy and durability.

It is a front view of the tube cutting machine which shows 1st Embodiment of this invention. It is a front view of the tube cutting machine which shows the 2nd Embodiment of this invention. It is a perspective view from the front side of the tube cutting machine which shows the 3rd Embodiment of this invention. A perspective view from the front side of the pipe cutting machine shows a state in which the front side is open. It is a perspective view from the rear view of the pipe cutting machine. A perspective view from the back side of the pipe cutting machine shows the main components.

An embodiment of the present invention will be described below.

First, the tube cutting machine of the first embodiment will be described with reference to FIG.

The pipe cutting machine of the first embodiment is a pipe cutting machine that cuts the pipe 10 at right angles to the center line thereof, and the plane perpendicular to the center line of the pipe 10 to be cut is the xy plane, and the center of the pipe. A pair of rotary saw blades 20 and 20 arranged so that the cutting edges overlap in the x-axis direction on both sides of the y-axis and a pair of rotary saw blades 20 and 20 on and near the x-axis. Interference between the linear drive mechanism 50 that drives the pair of rotary saw blades 20 and 20 in the opposite direction in the y-axis direction and the cutting edge when the pair of rotary saw blades 20 pass each other on or near the x-axis. In order to avoid It includes conversion mechanisms 46 and 47.

According to the above configuration, a pair of rotary saw blades 20, 20 arranged so that the cutting edges overlap in the x-axis direction on both sides of the y-axis in the xy-plane are driven straight in the opposite direction in the y-axis direction. Will be done. Further, when the pair of rotary saw blades 20 and 20 pass each other on and near the x-axis, a part of the linear driving force in the y-axis direction is converted in the x-axis direction to form the pair of rotary saw blades 20 and 20. By moving away from the y-axis and moving outward, interference between the cutting edges of the pair of rotary saw blades 20 and 20 is avoided.

Since the pipe 10 is cut in this way, the large-diameter pipe 10 can also be cut efficiently and with high accuracy in a short time. Moreover, since the structure is simple, the device is small and lightweight, and is economical and durable.

Next, the tube cutting machine of the second embodiment will be described with reference to FIG.

The pipe cutting machine of the second embodiment is a pipe cutting machine that cuts the pipe 10 at right angles to the center line thereof, and the plane perpendicular to the center line of the pipe 10 to be cut is the xy plane, and the center of the pipe. A pair of rotary saw blades 20 and 20 arranged so that the cutting edges overlap in the x-axis direction on both sides of the y-axis and a pair of rotary saw blades 20 and 20 on and near the x-axis. Interference between the linear drive mechanism 50 that drives the pair of rotary saw blades 20 and 20 in the opposite direction in the y-axis direction and the cutting edge when the pair of rotary saw blades 20 pass each other on or near the x-axis. In order to avoid It includes conversion mechanisms 46 and 47.

According to the above configuration, a pair of rotary saw blades 20, 20 arranged so that the cutting edges overlap in the x-axis direction on both sides of the y-axis in the xy-plane are driven straight in the opposite direction in the y-axis direction. Will be done. Further, when the pair of rotary saw blades 20 and 20 pass each other on and near the x-axis, a part of the linear driving force in the y-axis direction is converted in the x-axis direction to form the pair of rotary saw blades 20 and 20. By moving away from the y-axis to the outside, interference between the cutting edges of the pair of rotary saw blades 20, 20 is avoided.

Since the pipe 10 is cut in this way, the large-diameter pipe 10 can also be cut efficiently and with high accuracy in a short time. Moreover, since the structure is simple, the device is small and lightweight, and is economical and durable.

Next, the tube cutting machine of the third embodiment will be described with reference to FIGS. 3 to 6. Note that FIG. 1 shows the main components of the tube cutting machine shown in FIGS. 3 to 6.

The pipe cutting machine of the third embodiment is used as a traveling type cutting machine that cuts a pipe continuously discharged from the line, for example, at the exit of an electric sewing pipe manufacturing line while traveling together with the pipe.

As shown in FIGS. 3 to 6, the pipe cutting machine of the present embodiment cuts the pipe 10 by rotary saw blades 20 and 20 arranged opposite to each other on both sides of the path center (that is, the center line). .. In the following description, the plane perpendicular to the path center (that is, the center line) of the tube 10 is defined as the xy plane, the x-axis is the horizontal line, the y-axis is the vertical line perpendicular to the horizontal line, and the z-axis is the path center of the tube 10. (That is, the center line). Further, the front side in FIGS. 3 and 4 is referred to as a line exit side, that is, the discharge side of the pipe 10 is referred to as a front side, and the front back side is referred to as a line entry side, that is, the entrance side of the pipe 10 is referred to as a back side.

This tube cutting machine has rotary saw blades 20 and 20 arranged so as to face each other so that the cutting edges overlap in the x-axis direction, particularly on both sides of the y-axis in the xy plane, and rotary saw blades 20 and 20 on both sides. A linear drive mechanism 50 that drives the rotary saw blades 20 and 20 on both sides in the opposite direction in the y-axis direction so as to pass each other on and near the x-axis, and the rotary saw blades 20 on both sides on and near the x-axis. A power direction conversion mechanism that changes a part of the linear driving force in the y-axis direction to the x-axis direction and moves the pair of rotary saw blades 20, 20 away from the y-axis (that is, outside) when they pass each other. It is provided with a clamping mechanism 60 for fixing the pipe 10 to be cut.

The rotary saw blades 20 and 20 on both sides are arranged in a rectangular frame 30 surrounding the path center (that is, the z-axis) of the tube 10, and more specifically, the saw blade units on both sides arranged in the frame 30. The cutting edges are mounted on the 40 and 40 so as to overlap in the x-axis direction.

The frame 30 has a pair of upper and lower horizontal members 31, 31 that sandwich the z-axis from above and below, a pair of left and right vertical members 32, 32 that sandwich the z-axis from both sides, and a quadrangular and vertical back plate 33 fixed inside these. And the connecting rods 34, 34 on both sides connecting the upper and lower horizontal members 31, 31 on the front side, and an opening 35 through which the pipe 10 passes is provided in the central portion of the back plate 33.

The openings on the front side of the frame 30 are the closing plates 36, 36 on both sides arranged on the outside of the connecting rods 34, 34 on both sides, and the double doors 37 arranged on the inside of the connecting rods 34, 34. It is blocked by 37. The opening / closing doors 37, 37 having a double-door structure close the opening on the front side of the frame 30 leaving an opening 38 through which the pipe 10 passes and a space in which the front clamp 60A, which will be described later, is particularly arranged in the clamp mechanism 60. On the other hand, the connecting rods 34 and 34 on both sides are used as hinge shafts to open and close.

The frame 30 constitutes a chip collection box together with the back plate 33 on the back side, the closing plates 36, 36 on the front side, and the opening / closing doors 37, 37 having a double door structure. Further, one of the opening / closing doors 37 and 37 also serves as a support for the front clamp 60A, which will be described in detail later.

The saw blade units 40, 40 on both sides are arranged to face each other on both sides of the z-axis, which is the path center, and both have a first movable body 41 that can move in the y-axis direction and a first movable body that can move in the x-axis direction. It is composed of a combination with two movable bodies 42.

The first movable body 41 is located on the line exit side, that is, the front side of the back plate 33 in the frame 30, and two linear guides in the y-axis direction attached to the front surface of the back plate 33. 43 is movably supported in the y-axis direction. Then, the linear drive mechanism 50 is synchronously driven in the opposite direction and symmetrically in the y-axis direction.

The straight drive mechanism 50 is arranged from the back surface side of the back plate 33 in the frame 30 to the upper side of the frame 30, and particularly the first movable bodies 41, 41 of the saw blade units 40, 40 on both sides are arranged in the y-axis direction. Synchronized drive symmetrically in the opposite direction.

More specifically, the straight drive mechanism 50 includes screw rods 51, 51 on both sides that are vertically and rotatably supported on the back surface side of the back plate 33, and ball screws 52 on both sides that are screwed into the screw rods 51, 51 on both sides. , 52, and the ball screws 52 and 52 on both sides are connected to the first movable bodies 41 and 41 supported on the front side of the back plate 33, and the screw rods 51 and 51 on both sides are connected to the frame 30. The first movable bodies 41 and 41 on both sides are synchronously and synchronously driven in the opposite direction in the y-axis direction as described above by being rotationally driven in the opposite directions in synchronization with the motor 53 and the connecting shaft 54 arranged above. do.

That is, when one of the first movable bodies 41 and 41 descends from the upper standby position in the frame 20 toward the lower standby position, the other moves from the lower standby position in the frame 30 to the upper standby position. Ascend towards. As a result, the saw blade units 40 and 40 on both sides are driven linearly in the opposite direction and symmetrically in the y-axis direction together with the rotary saw blades 20 and 20, and pass each other on and near the x-axis.

On the other hand, the second movable body 42 is arranged on the front side of the first movable body 41, and supports the rotary saw blade 20 together with the rotary drive machine 21 on the inner portion near the y-axis. The rotary drive machine 21 is a hydraulic motor here, and a rotary saw blade 20 is connected (that is, directly connected) to the front side thereof without a reduction mechanism.

The second movable body 42 is attached to the front side of the first movable body 41 via an elastic member 46 which is a saw blade urging mechanism, and more specifically, the second movable body 42 is attached to the front side of the first movable body 41. A coil spring-like elastic member 46 mounted on two x-axis direction rods 45 while being movably supported in the x-axis direction by two x-axis direction linear guides 44 mounted on the surface. Is being urged inward by. Then, in a state where the second movable body 42 is elastically held at the limit position inside the range of motion by the urging force, the rotary saw blades 20 and 20 in the saw blade units 40 and 40 x the respective cutting edges. Overlap in the axial direction.

Curved guides 47, 47, which are guide mechanisms, are symmetrically projected on the front surface of the back plate 23 with the z-axis, which is the path center, interposed therebetween. Each curved guide 47 is on the x-axis and has an arcuate guide surface 48 that is convex outward.

More specifically, a part of the second movable body 42 penetrates the first movable body 41 on the back side and protrudes further to the back side of the first movable body 41, and is arranged on the back side of the first movable body 41. It supports the contactor 49. The contactor 49 is a roller that abuts on the guide surface 48 of the curved guide 47, which is a guide mechanism, and when the saw blade unit 40 passes on or near the x-axis, it is guided by the guide surface 48 and displaced outward. ..

Due to the outward displacement of the second movable body 42, the saw blade unit 40 retracts and moves outward in an arc shape against the urging force of the elastic member 46 when passing on and near the x-axis. Avoid the situation where the rotary saw blades 20 and 20 on both sides interfere with each other.

As can be seen, when the rotary saw blades 20 and 20 on both sides pass each other on and near the x-axis, a part of the linear driving force in the y-axis direction is converted in the x-axis direction to convert the saw blade units 40 and 40. The power direction conversion mechanism avoids the interference of the cutting edge when the rotary saw blades 20 and 20 pass each other on and near the x-axis by moving the second movable bodies 42 and 42 inside apart from each other. On either side, the combination of the elastic member 46 provided as a saw blade urging mechanism in the saw blade unit 40 and the curved guide 47 provided as a guide mechanism on the front surface of the back plate 23 It is configured.

The clamp mechanism 60 includes a pair of front and rear clamps 60A and rear clamps 60B provided on the front side of the back plate 33 in the frame 30. The front and rear pair of front clamps 60A and rear clamps 60B are arranged on the front and back (that is, the front side and the back side) of the xy surface which is the arrangement surface and the cutting surface of the rotary saw blades 20 and 20, respectively.

The front clamp 60A on the front side holds and fixes the pipe 10 from above and below on the front side of the cutting surface by the rotary saw blades 20 and 20, particularly near the cutting surface, and specifically, for holding the pipe 10. Upper and lower clamp heads 61A, 61A, vertical rod-shaped support members 62A, 62A that support the upper and lower clamp heads 61A, 61A from above and below, and upper and lower guide members 63A, which guide the support members 62A, 62A in the vertical direction. It is provided with 63A and upper and lower springs 64A and 64A that urge the support members 62A and 62A in each of the upper and lower directions with respect to the upper and lower guide members 63A and 63A.

The guide members 63A and 63A of the front clamp 60A are attached to one of the opening / closing doors 37 and 37 having a double door structure, here, at the inner edge of the opening / closing door 37 on the right side. As a result, when the opening / closing door 37 on the right side is shifted from the closed state to the open state, the front clamp 60A swivels toward the front side around the right connecting rod 34 and opens the front side of the rotary saw blades 20 and 20. do.

On the other hand, the rear clamp 60B on the back side holds and fixes the pipe 10 from above and below on the back side of the cutting surface by the rotary saw blades 20 and 20, particularly near the cutting surface, and drives the rotary saw blades 20 and 20. It is arranged between the rotary drives 21 and 21. After that, the clamp 60B is used to vertically guide the upper and lower clamp heads 61B and 61B, the vertical rod-shaped support members 62B and 62B that support the upper and lower clamp heads 61B and 61B from above and below, and the support members 62B and 62B in the vertical direction. The guide members 63B and 63B are supported by the frame 30.

Then, the front and rear shared cylinders 65 and 65 provided above and below the frame 30 are via the front and rear shared elevating heads 66 and 66, and the support members 62A and 62A of the front clamp 60A and the support members 62B of the rear clamp 60B. By pressing 62B from above and below, the tube 10 is located near the cut surface on the front side and the back side of the cut surface by the clamp heads 61A and 61A of the front clamp 60A and the clamp heads 61B and 61B of the rear clamp 60B. , Clamped and fixed from above and below.

Here, the upper and lower support members 62B and 62B in the rear clamp 60B are coupled to the upper and lower elevating heads 66 and 66, but the upper and lower support members 62A and 62A in the front clamp 60A are attached to the front side of the front clamp 60A. In order to allow turning movement, the upper and lower elevating heads 66 and 66 are in a non-coupled state (edge cut off).

Due to this coupling / non-coupling, when the upper and lower elevating heads 66 and 66 return to their original positions, the upper and lower support members 62B and 62B in the rear clamp 60B are driven to return to their original positions, but in the front clamp 60A. The upper and lower support members 62A and 62A are not driven to return to their original positions by the upper and lower elevating heads 66 and 66. Instead of this, the upper and lower support members 62A and 62A return to their original positions by the urging force of the upper and lower springs 64A and 64.

Next, the pipe cutting operation by the pipe cutting machine of the third embodiment will be described.

In the standby state, one of the saw blade units 40, 40 on both sides is in the upper standby position, and the other is in the lower standby position. Further, the upper and lower clamp heads 61A and 61A in the front clamp 60A and the upper and lower clamp heads 61B and 61B in the rear clamp 60B are both in a vertically open state. Further, the opening / closing doors 37 and 37 having a double door structure are in a closed state.

When the pipe 10 to be cut is inserted into the cutting machine, the upper and lower cylinders 65 and 65 are activated to operate the upper and lower clamp heads 61A and 61A in the front clamp 60A and the upper and lower clamp heads 61B and 61B in the rear clamp 60B. Drive in the closing direction. As a result, the pipe 10 is sandwiched and fixed from above and below the front and back of the cut surface.

When the tube 10 is fixed, the rotary saw blades 20 and 20 on both sides start to rotate. At the same time, the saw blade units 40 and 40 on both sides start to move straight from their respective standby positions to the other standby position. That is, one of the saw blade units 40, 40 starts to descend from the upper standby position to the lower standby position, and the other starts to ascend from the lower standby position to the upper standby position.

As a result, the rotary saw blades 20 and 20 mounted on the saw blade units 40 and 40 on both sides move from the symmetrical position (that is, the upper standby position and the lower standby position) across the x-axis to the x-axis. Go straight toward and pass on and near the x-axis to the opposite symmetrical position (ie the lower standby position and the upper standby position). Since the rotary saw blades 20 and 20 on both sides are arranged at positions where the cutting edges overlap each other in the x-axis direction, the pipe 10 is shortened by the linear operation of the two rotary saw blades 20 and 20 in the y-axis direction. Is cut efficiently.

When the rotary saw blades 20 and 20 on both sides pass each other on and near the x-axis, the cutting edges interfere with each other as they are, but they are urged inward by the coil spring-like elastic members 46 and 46 in the saw blade units 40 and 40. By being guided by the curved guides 47 and 47 on both sides, the second movable bodies 42 and 42 on both sides are retracted and moved outward against the urging force, so that the interference is avoided.

Thus, the tube 10 is cut by the rotary saw blades 20, 20 on both sides. Chips generated by cutting the tube 10 are collected in the frame 30 which is a chip collection box, and are prevented from being scattered to the surroundings. The opening 35 provided in the back plate 33 should be closed with a lid plate or the like, leaving a hole through which the maximum diameter pipe 10 can pass. In the case of a small diameter pipe, the outer peripheral portion of the clamp head to be replaced should be closed. It is further preferable to provide a member that covers the gap with the lid plate or the like. By doing so, it is prevented that the chips generated at the time of cutting are scattered to the upstream side, and the efficiency of collecting the chips into the frame 30 is improved in combination with the opening / closing door 37 provided on the downstream side, and the chips are collected. The effectiveness of the measures will be further improved.

The structural and functional features of the tube cutting machine of this embodiment are as follows.

The operation of the rotary saw blades 20 and 20 on both sides retracting outward in the x-axis direction is performed by using the linear driving force in the y-axis direction, that is, by converting to the x-axis direction. , Does not require a drive source. That is, the required power is basically only the rotational driving force for rotating the rotary saw blades 20 and 20 on both sides and the linear driving force in the y-axis direction. Therefore, although the rotary saw blades 20 and 20 on both sides are driven in two directions on the xy plane, the drive mechanism is simplified.

Since the rotary saw blades 20 and 20 do not cut the entire pipe 10 but only cut about half of the pipe 10, the cutting time is shortened as compared with the case of cutting the entire pipe 10. Further, the radii of the rotary saw blades 20 and 20 become smaller, which also contributes to the simplification of the structure.

The fact that the rotary saw blades 20 and 20 on both sides do not rotate around the pipe 10 and are driven linearly in the y-axis direction means that the moving range of the rotary saw blades 20 and 20 is narrow. In collaboration with the simplification of the above, it contributes to the miniaturization and weight reduction of the pipe cutting machine.

After one of the rotary saw blades 20 and 20 descends from the upper standby position to the lower standby position and the other rises from the lower standby position to the upper standby position, the rotary saw blades 20 and 20 are used in the next cutting. One rises from the lower standby position to the upper standby position and the other descends from the upper standby position to the lower standby position. This eliminates the need to return the rotary saw blades 20 and 20 to their original positions in preparation for the next cutting, and shortens the cutting process.

When the rotary saw blades 20 and 20 on both sides pass each other on and near the x-axis, they move backward to the outside, but since the width of the pipe 10 is maximum on the x-axis, the rotary saw blades 20 and 20 on both sides are pipes. The situation that deviates from 10 is effectively avoided. Therefore, the range of pipe diameters that can be shared by the rotary saw blades 20 and 20 is widened, and the diameters of the rotary saw blades 20 and 20 and the types thereof can be reduced. That is, one of the features of the pipe cutting machine is that it can cut pipes 10 of various diameters, the outer diameters of the rotary saw blades 20 and 20, the guide surface shape of the curved guides 47 and 47, and the front. By optimizing the contact surface shapes of the upper and lower clamp heads 61A and 61A in the clamp 60A and the upper and lower clamp heads 61B and 61B in the rear clamp 60B, it is possible to set a wide range of combined use.

Since the front side of the cut surface by the rotary saw blades 20 and 20 does not interfere with other equipment, the pipe 10 can be fixed by the front clamp 60A at a position close to the cut surface, but the back side of the cut surface rotates. Since there is a concern about interference with the saw blade units 40 and 40 on which the saw blades 20 and 20 are mounted, it is not easy to fix the pipe 10 by the rear clamp 60B at a position close to the cut surface.

However, in the pipe cutting machine of the present embodiment, the rotary saw blades 20 and 20 on both sides do not rotate around the pipe 10 but are driven straight in the y-axis direction and retract and move outward in the x-axis direction. Therefore, a linear space extending in the y-axis direction can be formed between the saw blade units 40 and 40 on both sides. On the other hand, the front clamp 60A and the rear clamp 60B are designed to be long in the y-axis direction because the clamp direction is in the y-axis direction. Therefore, the rear clamp 60B of the pipe clamp mechanism 60 can be arranged between the saw blade units 40 and 40 on both sides, and the pipe 10 can be fixed at a position close to the cut surface both before and after the cut surface. ..

That is, since the linear drive direction of the saw blade units 40 and 40 on both sides (the same as the linear drive direction of the rotary saw blades 20 and 20 on both sides) and the clamp direction of the rear clamp 60B are the same, both before and after the cut surface. The tube 10 can be fixed at a position close to the cut surface, and as a result, the tube 10 is firmly fixed, so that the cutting efficiency of the tube 10 is improved and the service life of the rotary saw blades 20 and 20 is extended.

In addition, in the pipe cutting machine of the present embodiment, the clamping direction of the front clamp 60A is also the y-axis direction, which is the same as the clamping direction of the rear clamp 60B. , 66 is driven to open and close. Therefore, the drive mechanism of the clamp mechanism 60 is simplified.

Since the front clamp 60A is attached to one of the opening / closing doors 37 and 37 (here, the opening / closing door 37 on the right side), when the opening / closing doors 37 and 37 are moved from the closed state to the open state, the front clamp 60A is released. The front side of the rotary saw blades 20 and 20 is opened by swiveling to the front side around the right connecting rod 34. This makes it possible to replace the rotary saw blades 20 and 20 without disassembling a part of the frame 30. Therefore, the replacement work of the rotary saw blades 20 and 20 is easy.

On the front side of the frame 30, by operating the clamp mechanism 60, a reaction force in the separation direction acts on the upper and lower horizontal members 31, 31. However, the upper and lower horizontal members 31, 31 are connected by the connecting shafts 34, 34. Therefore, the required strength is secured while maintaining the weight reduction. Since the connecting shafts 34, 34 on both sides also serve as hinge shafts for the opening / closing doors 37, 37, this also contributes to the weight reduction of the frame 30.

In addition, the rotary drives 21 and 21 of the rotary saw blades 20 and 20 are hydraulic motors here. Since the hydraulic motor is lightweight and has a constant torque, the rotary saw blades 20 and 20 can be directly driven without going through a speed reducer. Due to this miniaturization, the space formed between the saw blade units 40 and 40 on both sides becomes large, and the rear clamp 60B can be easily arranged. Therefore, from this viewpoint as well, the miniaturization and weight reduction of the device are promoted. ..

In addition, if the rotary saw blades 20 and 20 are driven by the hydraulic motor at a constant rotational speed and the ascending / descending speeds of the rotary saw blades 20 and 20 are variably controlled by the linear drive mechanism 50, the rotary saw blades 20 and 20 It is possible to extend the life of the cutting edge.

Therefore, both the pipe cutting machine of the third embodiment and the large-diameter pipe 10 can be efficiently cut in a short time. Moreover, since the structure is simple, it is small and lightweight, and is excellent in economy and durability.

In the present embodiment, the x-axis in the xy plane is a horizontal line, and the y-axis is a vertical line perpendicular to the horizontal line, but the present invention is not limited to this. The y-axis may be a horizontal line and the x-axis may be a vertical line perpendicular to the horizontal line. The directions of the two axes mean two directions at right angles in the xy plane.

Further, in the present embodiment, the power direction changing mechanism includes an elastic member 46 provided as a saw blade urging mechanism in the saw blade unit 40 and a curved guide provided as a guide mechanism on the front surface of the back plate 23. Although it is configured by the combination with 47, the combination is not limited to the combination of the saw blade urging mechanism and the guide mechanism, and a guide rail may be used.

In relation to the power direction conversion mechanism, in the second embodiment illustrated in FIG. 2, the saw blade 20 of the pair of rotary saw blades 20 and 20 that does not move away from each other also has a saw blade. Although the elastic member 46 as the urging mechanism is shown, it is of course possible to omit the saw blade urging mechanism together with the guide mechanism and fix the rotary saw blade 20 in the x-axis direction.

When the power direction changing mechanism is composed of a combination of a saw blade urging mechanism and a guide mechanism, the saw blade urging mechanism has at least one of the pair of rotary saw blades 20, 20 inside in the above-described embodiment. Although the elastic member 46 is elastically held in the movement limit, a pressing mechanism by fluid pressure such as a hydraulic cylinder or a pneumatic cylinder may be used. That is, the urging force for holding at least one of the pair of rotary saw blades 20 and 20 in the inner movement limit may be a spring pressure or a fluid pressure such as hydraulic pressure.

When the saw blade urging mechanism is a pressing mechanism by fluid pressure, at least one of the pair of rotary saw blades 20, 20 is held at a set pressure by fluid pressure within the inner movement limit. When the rotary saw blades 20 and 20 on both sides pass each other on and near the x-axis, at least one of the pair of rotary saw blades 20 and 20 is pushed outward by the guide mechanism at a pressure exceeding the set pressure. By returning and moving back and forth, interference between the pair of rotary saw blades 20 and 20 is avoided as in the case of the elastic member 46. Rather, the pressing mechanism by the fluid pressure can easily increase the pressing pressure (set pressure) as compared with the case of the elastic member 46, so that the saw blade urging mechanism can be miniaturized. In addition, since the pressing pressure (set pressure) can be easily adjusted, for example, if the pressing pressure at the time of the first cutting is increased from the set value and then reduced to the set value immediately after the cutting, the cutting operation is more stabilized. Can be planned.

In addition to this, when the diameter of the tube 10 becomes large, it becomes necessary to replace the curved guide 47, which is a guide mechanism, whereby the moving distance of the rotary saw blade 20 in the x-axis direction becomes long, and the elastic member 46 is also replaced. May be necessary. When a pressing mechanism by fluid pressure such as a hydraulic cylinder is adopted instead of the elastic member 46 in obtaining the urging force, the operating stroke and the urging force can be made variable, so that a product group having a wide diameter range of the pipe 10 can be used. It is convenient for cutting, and the applicable range of the cutting device can be expanded.

10 pipe 20 rotary saw blade 21 rotary drive machine 30 frame 31 horizontal member 32 vertical member 33 back plate 34 connecting rod 35 opening 36 closing plate 37 opening and closing door 40 saw blade unit 41 first movable body 42 second movable body 43, 44 straight line Guide 45 Rod 46 Elastic member (saw blade urging mechanism)
47 Curved guide (guide mechanism)
48 Guide surface 49 Contact 50 Straight drive mechanism 51 Screw rod 52 Ball screw 53 Motor 54 Connecting shaft 60 Clamp mechanism 60A Front clamp 60B Rear clamp 61A, 61B Clamp head 62A, 62B Support member 63A, 63B Guide member 64A Spring 65 Cylinder 66 head

Claims (8)

A stationary or traveling pipe cutting machine that cuts a pipe at a right angle to its center line.
A pair of rotations arranged so that the cutting edges overlap in the x-axis direction on both sides of the y-axis, with the plane perpendicular to the center line of the pipe to be cut as the xy plane and the center of the pipe as the origin of the coordinates. With a saw blade,
A linear drive mechanism that drives the pair of rotary saw blades in the opposite direction in the y-axis direction so that the pair of rotary saw blades pass each other on and near the x-axis.
In order to avoid interference with the cutting edge when the pair of rotary saw blades pass each other on or near the x-axis, a part of the linear driving force in the y-axis direction is converted in the x-axis direction to at least the pair of rotary saw blades. It is equipped with a power direction conversion mechanism that moves one side away from the y-axis.
The power direction changing mechanism includes a saw blade urging mechanism that urges at least one of a pair of rotary saw blades inward toward the y-axis and holds it in the inner movement limit.
It includes a guide mechanism that retracts and moves at least one of the pair of rotary saw blades to the outside against the urging force when the pair of rotary saw blades pass each other on or near the x-axis.
The saw blade urging mechanism is a tube cutting machine that is a fluid pressure pressing mechanism that presses and holds at least one of a pair of rotary saw blades to the inner movement limit by fluid pressure . In the tube cutting machine according to claim 1 ,
The guide mechanism is a pipe cutting machine including a curved guide that is convex outward. In the tube cutting machine according to claim 1,
The rotary saw blade is a pipe cutting machine driven by a hydraulic motor. In the tube cutting machine according to claim 3 ,
The hydraulic motor is a pipe cutting machine that is directly connected to a rotary saw blade. In the tube cutting machine according to claim 1,
Further, a pipe cutting machine provided with a front clamp and a rear clamp arranged on the front side and the back side of the cutting surface by a pair of rotary saw blades to fix the pipe, respectively. In the tube cutting machine according to claim 5 ,
The rear clamp is a pipe cutting machine that clamps a pipe in the y-axis direction, which is the straight drive direction of the rotary saw blade. In the tube cutting machine according to claim 6 ,
Both the front clamp and the rear clamp are pipe cutting machines that clamp the pipe in the y-axis direction, which is the straight drive direction of the rotary saw blade. In the tube cutting machine according to claim 5 ,
It is equipped with a chip collection box that collects chips generated by cutting the pipe by covering the moving area of the pair of rotary saw blades.
The chip collection box has an opening / closing door that opens / closes an opening on the front side, and a pipe cutting machine that supports the front clamp with the opening / closing door.

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