JP3012829B2 - Pipe vendor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe bender for bending a pipe having a relatively large diameter.

[0002]

2. Description of the Related Art Conventionally, as a pipe bender for bending a pipe having a relatively large diameter, for example, as disclosed in Japanese Utility Model Laid-Open No. 59-102214 and Japanese Utility Model Laid-Open No. 59-102215, a pipe is mounted on a base. A bending metal fitting having a semicircular curved portion for bending is provided, and a pipe fixed to one end of the bending metal fitting is bent by pressing a jack against a bending metal fitting by a rail provided at a tip portion.
According to these pipe benders, the pipe can be bent according to the shape of the bending fitting.

However, in the construction as disclosed in Japanese Utility Model Application Laid-Open No. Sho 59-102214, the rail for pressing the pipe against the bending bracket is linear and long, and when this is pressed against the bending bracket to bend the pipe, the rail by the jack is used. As the tip moves, the rear end moves away from the bending metal.
Therefore, a structure for guiding the movement of the rear end of the rail must be provided. In the pipe bender disclosed in the publication, a track groove is provided in a track plate for guiding the movement of the rear end of the rail, and a track pin slides in the track groove to guide the movement of the rear end of the rail. I have.

Similarly, in Japanese Utility Model Application Laid-Open No. 59-102215, a bending member and a rail are restrained by a restraining member having a spring so that the rail is not separated from the bending metal at a position where the rail is pressed against the bending metal. But
Since the pressing portion moves from the rear end of the rail to the front end by gradually pressing the jack, the restraining member must be moved accordingly. In the pipe bender of the publication, a guide groove is provided in a bending metal and a rail, a pin and a bearing are loosely fitted in the guide groove in a restraining member, and pins loosely fitted in the bending metal and a guide groove of the rail are separated by a spring. While being restrained, the restraining member slides in the guide groove.

As described above, in Japanese Utility Model Laid-Open No. 59-102214, a track pin for guiding the movement of the rear end of the rail,
A track plate, a track groove, and the like must be provided, and the configuration is complicated. Similarly, Japanese Utility Model Laid-Open No. 59-10221
Also in No. 5, a pin, a bearing, a spring for restraining the pins and the like must be provided, and the configuration is complicated.

[0006] For those having such a configuration,
Since a large load must be applied to the pipe in order to bend a pipe having a relatively large diameter, the track pins and track grooves or the pins, bearings, springs, and the like disclosed in the above publication must be made highly durable. However, there are inconveniences such as the need to increase the size of the device and the use of expensive materials.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to improve a pipe bender. More specifically, in order to solve the above-mentioned disadvantage, a pipe having a relatively large diameter can be easily bent at an arbitrary angle. It is an object of the present invention to provide a pipe vendor that is easy to maintain.

[0008]

In order to achieve the above object, a pipe bender according to the present invention comprises a turntable rotatably supported on a base and a pipe extending outward from the turntable. A forming die having a forming surface for bending and fixed to the turntable, a guide member provided at a position on the base opposite to the forming surface of the forming die, for guiding a pipe slidably, A drive wire, one end of which is fixed to the outer periphery of the turntable and wound in the direction of rotation of the turntable; a cylinder that moves the drive wire by a piston so as to rotate the turntable ; The piston is over the maximum advance position.
The base is rotatably supported on the base at a distance from the
Return idle pulley and the outer periphery of the turntable
And one end is fixed in the direction opposite to the turn of the turntable.
Once wound, the return idle pulley
A return wire that is wound around the piston in the advance direction, and a pipe is fixed to an end of the molding surface on the rotation side of the turntable along the molding surface of the molding die. Along with the guide member, the pipe is brought into contact with the molding surface, the piston is advanced, the turntable is rotated via the driving wire, and the pipe is slid on the guide member. The pipe is bent along the mold, and the piston is retracted.
The return through the return idle pulley
The turntable is rotated in the opposite direction by the wire
It is characterized by being performed.

In the pipe bender of the present invention, the turntable is rotated by the driving wire by causing the piston of the cylinder to advance. A molding die is fixed to the turntable, and a pipe is fixed to an end of a molding surface in a rotating direction of the molding die. Therefore, the pipe is also rotated together with the turntable and the molding die from a position fixed to the molding die. Here, since the pipe is slidably guided by the guide member, rotation is suppressed by the guide member. When the piston is further advanced from this state and the turntable is rotated, the rotation of the pipe is suppressed by the guide member and the pipe is slidably guided by the guide member, so that the pipe is bent along the forming die.

As described above, according to the pipe bender of the present invention, the pipe can be bent by rotating the turntable via the driving wire by the piston of the cylinder, so that the conventional pipe bender can be bent. As described above, since there is no movement of the fulcrum, a structure for moving the fulcrum is not required. Further, since a wire is used for transmitting power from the cylinder to the turntable, even if the wire deteriorates due to multiple uses, only the wire needs to be replaced.

When the piston is retracted,
Since the turntable is rotated in the counter-rotating direction by the return wire via the return idle pulley, the turntable can be returned to a state before the pipe bending operation is performed.

A pipe bender according to the present invention further comprises a driving idle pulley rotatably supported by the base on the retreating side of the piston at a position not less than a maximum retreat position of the piston, and a tip end of the piston. A driving pulley rotatably provided on the base, a wire fixing member provided on the base in a retreating direction side of the piston at a position equal to or more than a maximum retreat position of the piston, and a rotatable free end on a distal end portion of the piston. A return pulley provided, and a pivotally rotatably supported by the base at a position opposed to the return idle pulley with the cylinder interposed therebetween in a direction in which the piston advances beyond a maximum advance position of the piston. A second return idle pulley; and a damper provided on the base on the piston retreating side with respect to the second return idle pulley to adjust a tension of the return wire. A wire is wound around the driving idle pulley from the retreating side of the piston, is wound around the driving pulley from the advancing direction side of the piston, is fixed to the wire fixing member, and the return wire is The piston is wound around the return idle pulley from the side in which the piston advances, the return pulley is bridged from the side in which the piston moves backward, and the second return idle pulley is bridged from the side in which the piston advances. And connected to the damper.

According to this, when the piston is advanced, the driving wire is moved by the driving pulley, and the turntable is rotated via the driving idle pulley. When the piston is retracted, the return wire is moved by the return pulley,
The turntable is rotated in the counter-rotating direction via the return idle pulley. When the piston is advanced, the turntable is rotated by the driving wire.At the same time, the return wire is pulled by the turntable, and the return pulley advances together with the piston. The return wire is sent according to the rotation of the turntable. At this time, since the tension of the return wire is adjusted by the damper, loosening of the return wire is prevented.

It is preferable that a plurality of the molds are provided in accordance with the diameter and curvature of the pipe, and the molds are detachably provided on the turntable. According to this, a plurality of types of pipes can be bent into an arbitrary shape by exchanging the mold.

When the turntable is provided with a work bed formed to be larger than the turntable and capable of fixing the mold at an arbitrary position, the forming bed is larger than the outer diameter of the turntable. The mold can also be attached to the work bed, and the mold can be fixed at any position, so that the mold can be easily fixed.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a pipe bender according to the present invention will be described with reference to FIGS. FIG. 1 is an explanatory view showing a state in which a pipe is mounted on a pipe bender of the present embodiment, FIG. 2 is an explanatory view showing a state in which the pipe is fixed to a forming die by a clamp, and FIG. 3 is a state in which the pipe is bent. FIG.

In the pipe bender 1 of this embodiment, a turntable 3 is rotatably supported on a base 2, and a work bed 4 is provided integrally with the turntable 3.
A guide roller 6 (guide member) for slidably guiding the pipe 5 is provided on the base 2, and a drive idle pulley 7 is rotatably supported in the vicinity of the turntable 3. And a hydraulic cylinder 9 for moving the piston 8 forward and backward. A drive pulley 10 and a return pulley 11 are coaxially and rotatably provided at the distal end of the piston 8, and are advanced and retracted in the horizontal direction in FIG. . Also, this piston 8
The base 2 extends in the direction in which the idle pulley 12 extends, and a return idle pulley 12a and a second return idle pulley 12b are rotatably supported at the distal ends thereof.

On the outer periphery of the turntable 3, two wire locking portions for locking the wire are provided.
A driving wire 14 for rotating the turntable 3 when bending the pipe 5 is locked to the first wire locking portion 13, and a driving wire 14 for rotating the turntable 3 when returning the turntable 3 to the initial position is fixed to the second wire locking portion 15. The return wire 16 to be used is locked. The driving wire 14 is connected to the first wire locking portion 13.
One end of the drive pulley is wound in the direction of rotation of the turntable 3 in FIG. 1, that is, in the upward direction in FIG. The other end is fixed to the wire fixing member 17 via these pulleys. The return wire 16 is
One end is locked by the second wire locking portion 15 and is wound in the counter-rotating direction of the turntable 3, that is, in the lower direction in FIG. 1, and is wrapped around the return idle pulley 12a from the traveling direction of the piston 8. Then, the piston 8 is wrapped around the return pulley 11 from the retreating direction side of the piston 8, and is wrapped around the second return idle pulley 12b from the traveling direction side of the piston 8;
The other end is connected to the damper 18 via these pulleys.

As shown in FIG. 1, the drive idle pulley 7 and the wire fixing member 17 are provided on the base 2 in the retreat direction side of the piston 8 at a position equal to or more than the maximum retreat position of the piston 8. The pulley 12a and the second return idle pulley 12b are provided on the base 2 on the side in which the piston 8 advances in a position higher than the maximum advance position of the piston 8.

The work bed 4 provided on the upper surface of the turntable 3 is formed so as to be larger than the turntable 3 in FIG. 1 so as to protrude upward in FIG. 1, and is compatible with a mold 19 having a large radius of curvature. It is formed so that it can be done. Further, the working bed 4 is provided with a large number of mounting holes 20 through which bolts for fixing the mold 19 are passed.

As shown in FIG. 1, the molding die 19 is provided with a molding surface 19a for bending a pipe, and its curvature is determined depending on how the bending is performed. As shown in FIG. 2, a semicircular concave groove 19b is provided on the molding surface 19a in accordance with the diameter of the pipe 5. The molding die 19 is formed in advance with a plurality of molding dies 19 on which a molding surface 19a and a concave groove 19b are formed in accordance with the curvature for performing the bending process and the diameter of the pipe. In addition, a clamp 21 for fixing the pipe 5 is provided at the tip of the molding die 19.

One end of the return wire 16 is connected to the tip of the damper 18 and urges the return wire 16 in the pulling direction. The damper 18 adjusts the tension of the wires 14 and 16 so that the drive wire 14 and the return wire 16 do not loosen when the pipe is bent or the turntable 3 is returned.

Next, the operation when the pipe 5 is bent using the pipe bender 1 of the present embodiment will be described. First, a mold 19 suitable for the outer diameter and the curvature of the pipe to be bent is fixed to the working bed 4 using the mounting holes 20 with bolts and nuts. As described above, a mold suitable for processing is selected from the plurality of molds 19 and fixed to the work bed 4. However, since a large number of mounting holes 20 are provided, the mold 19 can be easily attached. Can be. Then, as shown in FIG. 1, the pipe 5 is fixed to the tip of the molding die 19 using the clamp 21, and the pipe 5 is brought into contact with the guide roller 6.

In this state, the piston 8 is advanced rightward in FIG. 1 by the hydraulic cylinder 9. Then, the driving wire 14 is pulled by the driving pulley 10 provided at the distal end of the piston 8. One end of the driving wire 14 is fixed to the wire fixing member 17, so that the turntable 3 is fixed.
Is rotated clockwise in FIG. At this time, the return wire 16 is wound by the turntable 3 at the same time.
As a result, the return wire 16 having the same length as the length wound by the turntable 3 is sent to the turntable 3. At this time, since the damper 18 adjusts the return wire 16 by pulling the return wire 16 in the backward direction, the return wire 16 is prevented from being loosened.

Then, with the rotation of the turntable 3, the work bed 4 and the molding die 19 formed integrally with the turntable 3 rotate. At this time, pipe 5
Similarly, the guide roller 6 suppresses the rotation, and the pipe 5 is guided while sliding upward in FIG. 1 by the rotation of the guide roller 6. Thereby, the pipe 5 is pressed against the molding surface 19a of the molding die 19, and is bent in an arc shape along the molding surface 19a as shown in FIG. When the bending of the pipe 5 is completed, the advance of the hydraulic cylinder 9 is stopped, the clamp 21 is removed, and the pipe 5 is removed from the pipe bender 1.

In this state, the piston 8 is retracted to the left in FIG. At this time, the return pulley 11 provided coaxially with the driving pulley 10
As a result, the return wire 16 is pulled, but one end thereof is connected to the damper 18, so that the return wire 16 causes the turntable 3 to rotate in the counter-rotating direction in FIG. At this time, the driving wire is pulled by the first wire locking portion 13,
Since the driving pulley 10 moves to the left in FIG.
The driving wire 10 is sent according to the rotation of the turntable 3. Thereby, the turntable 3 and the work bed 4 return to the position of FIG. Therefore, the pipe 5 to be bent next can be quickly mounted on the pipe bender 1.

Here, if the operation of bending the pipe 5 is repeatedly performed, the driving wire 14 may be deteriorated. However, even in such a case, in the present embodiment, the driving wire 14 is replaced. Therefore, maintenance of the pipe bender 1 is easy.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a state in which a pipe is mounted on a pipe bender according to one embodiment of the present invention.

FIG. 2 is an explanatory view showing a state in which a pipe is fixed to a molding die by a clamp.

FIG. 3 is an explanatory view showing a state where a pipe is bent by the pipe bender of FIG. 1;

[Explanation of symbols]

1 ... pipe bender, 2 ... base, 3 ... turntable, 5
... pipe, 6 ... guide roller (guide member), 8 ... piston, 9 ... hydraulic cylinder (cylinder), 10 ... drive pulley, 14 ... drive wire, 17 ... wire fixing member, 19
... molding.

Claims (4)

(57) [Claims] 1. A turntable rotatably supported on a base, a forming die having a forming surface for bending a pipe toward the outside of the turntable and fixed to the turntable, A guide member provided at a position facing the molding surface of the molding die on the base to guide the pipe slidably, and one end fixed to the outer periphery of the turntable in a direction of rotation of the turntable. A driving wire to be wound, a cylinder for moving the driving wire by a piston so as to rotate the turntable ,
In the advance direction of the piston beyond the maximum advance position of the piston
Returning eye that is pivotally supported on the base so as to be separated
Pulley and one end fixed to the outer periphery of the turntable.
Is wound in the direction opposite to the turn of the turntable.
With the piston of the return idle pulley
A return wire that is extended in the advancing direction. A pipe is fixed to an end of the molding surface on the rotation side of the turntable along the molding surface of the molding die, and the molding is performed by the guide member. The pipe is brought into contact with the molding die by abutting the pipe on a surface, causing the piston to advance and rotating the turntable via the driving wire, and sliding the pipe against the guide member. When the piston is retracted, the return idle
The turn wire is returned by the return wire through a pulley.
A pipe bender wherein the bull is rotated in a counter-rotating direction . 2. A drive idle pulley rotatably supported by the base on the retreating direction side of the piston above the maximum retreat position of the piston, and rotatably provided at a tip end of the piston. A driving pulley, a wire fixing member provided on the base in the retreating direction side of the piston above the maximum retreat position of the piston, and a return pulley rotatably provided at the tip of the piston. A second return idle pulley rotatably supported by the base at a position opposite to the return idle pulley with the cylinder interposed therebetween in a direction in which the piston advances beyond the maximum advance position of the piston; A damper provided on the base on the piston retreating direction side of the second return idle pulley to adjust the tension of the return wire, wherein the drive wire is Around the piston from the retreating direction side of the piston, and from the reciprocating direction side of the piston to the driving pulley, and is fixed to the wire fixing member. Is extended from the retreat direction side of the piston to the return pulley, is extended from the retreat direction side of the piston, is extended from the advance direction side of the piston to the second return idle pulley, is connected to the damper, The drive wire is moved by the drive pulley when the piston is advanced, the turntable is rotated via the drive idle pulley, and the return pulley is used when the piston is retracted. The return wire is moved, and the turntable is rotated in the anti-rotation direction via the return idle pulley. The pipe vendor according to claim 1 , wherein: Wherein the mold has a plurality is provided according to the diameter and curvature of the pipe, the pipe bender of claim 1 or 2, characterized in that detachably attached to the turntable. 4. A formed large than the turntable, any one of claims 1 to 3, characterized in that it comprises a work bed that can fix the mold at an arbitrary position on the turntable 2. The pipe vendor according to claim 1.