KR20210091010A - Rotation assistance apparatus for welding curved pipe - Google Patents

Abstract

The present invention relates to a rotation assisting apparatus for welding a curved pipe, which comprises: a main body (10) having a movable roller (15) for supporting a curved pipe on a fixed rack (12) and a movable rack (13); a driving means (20) for connecting a servomotor (25) to the movable roller (15) to apply rotational force to the curved pipe; a sensing means (30) for detecting a rotational state of the curved pipe and the movable roller (15); and a controller (40) for controlling the driving means (20) in response to signals from the sensing means (30). Accordingly, risky elements resulting from installation of a weight during a process of welding the curved pipe while the curved pipe is rotated on a rotator are eliminated and a danger of a damage to a pipeline is excluded to prevent quality deterioration and contribute to an increase in productivity.

Description

{Rotation assistance apparatus for welding curved pipe}

The present invention relates to an apparatus for welding a curved pipe, and more particularly, to a rotational force auxiliary device for welding a curved pipe for welding by rotating an eccentrically bent curved pipe on a rotator.

When welding a pipe, the work is performed by rotating it with a rotator, but in the case of a curved pipe, the center of gravity is biased in a specific direction, so rotation is often impossible with the rotational force of the rotator. This is due to the structure in which a material such as an elbow is connected to the end of the straight pipe to form an eccentricity. As the size of the curved tube increases, the rotational force (torque) of the rotator becomes more varied according to the change in the rotational posture.

In relation to curved pipe welding, reference can be made to prior art documents such as Korean Patent Publication No. 1997640 and Korean Patent Application Laid-Open No. 2002-0090636.

The former is provided with a band-side fixing plate, the band portion fastened to the processing target pipe; It includes; a weight portion mounted on the band portion; and a coupling portion coupled to the band-side fixing plate to fix the weight portion to the band portion. Accordingly, it is easy to manufacture a large-sized piping pipe, and the effect of improving processing precision is expected.

It rotates the pipe by installing a weight in the opposite direction to the center of gravity, but it is structurally dangerous and may damage the pipe.

The latter detects the position of the part to be welded by the laser vision sensor while rotating the material in place, and displaces the welding torch to match the detected position so that welding is performed automatically, but depending on the shape of the part to be welded Make it possible to control the amount of welding by welding torch. Accordingly, the effect of facilitating welding line tracking and welding torch position control is expected.

However, since the structure for rotating the material in place is not specified, it has limitations in applying it to large curved pipes.

Korean Patent Publication No. 1997640 "Balance jig for piping and pipe processing" (published date: 2014.05.09.) Korean Patent Laid-Open Publication No. 2002-0090636 "Method and Apparatus for Welding a Bent Pipe Using a Laser Vision Sensor" (Published on: December 5, 2002)

It is an object of the present invention to improve the conventional problems as described above, to provide a rotational force assisting device for welding a curved tube for automatically assisting the rotational force without using a weight for welding by rotating a curved tube of an eccentric structure on a rotator. there is

In order to achieve the above object, the present invention provides an apparatus for assisting rotational force for welding a curved pipe, comprising: a main body having a fixed base and a movable roller for supporting the curved pipe on the movable table; a driving means for applying a rotational force to the curved pipe by connecting a servomotor to the movable roller; sensing means for detecting the rotating state of the curved pipe and the movable roller; and a controller for controlling the driving unit in response to the signal of the sensing unit.

According to the detailed configuration of the present invention, the driving means is characterized in that it further includes a height adjuster for varying the height of the fixed base and the movable table, and a spacer for changing the distance between the movable rollers of the fixed base.

According to the detailed configuration of the present invention, the sensing means is characterized in that it is provided with a speed detector for detecting the rotation speed of the curved pipe and the servomotor, and a torque detector for detecting the torque acting on the servomotor.

As a modified example of the present invention, the sensing means further comprises an image detector for detecting the rotational posture of the curved pipe.

According to the detailed configuration of the present invention, the controller is characterized in that the control of the height adjuster and the interval adjuster is selectively added based on the torque control by the current fluctuation of the servomotor.

As described above, according to the present invention, there is an effect of preventing quality deterioration and improving productivity by removing the risk factors due to the installation of a weight in the process of rotating the curved pipe onto the rotator and welding, and excluding the risk of pipe damage.

1 is a schematic diagram schematically showing an apparatus according to the present invention;
2 is a schematic diagram showing the main part of the device according to the present invention;
3 is a block diagram showing the control circuit of the device according to the invention;

Hereinafter, an embodiment of the present invention will be described in detail based on the accompanying drawings.

The present invention proposes a device for assisting rotational force for welding a curved pipe. It is intended for an apparatus for manufacturing a curved pipe constituting a pipe at a ship building site, but is not necessarily limited thereto. As shown in FIG. 1 , the curved pipe CP is manufactured by welding while rotating it on a rotator.

According to the present invention, the main body 10 has a structure provided with a movable roller 15 for supporting the curved pipe on the fixed base 12 and the movable table 13 . In FIG. 1 , the fixing table 12 is disposed on the upper side of the base 11 , and the L-shaped movable table 13 is disposed on one side of the fixing table 12 . Two movable rollers 15 are mounted on the stationary table 12 , and one movable roller 15 is mounted on the movable table 13 . The three movable rollers 15 must maintain a constant rotational state while holding the center of gravity of the curved pipe in a three-point support state. The movable roller 15 is formed of a material having strength, abrasion resistance, weather resistance, and sliding resistance to the curved pipe.

On the other hand, although omitted from the illustration, each movable roller 15 may be configured in a double row for stability of holding the curved tube and rotation.

In addition, according to the present invention, the driving means 20 has a structure in which the servomotor 25 is connected to the movable roller 15 to apply a rotational force to the curved pipe. The servomotor 25 can be operated quickly through position, speed, and torque control while generating high torque with a low voltage. Although it is preferred to connect each servomotor 25 to the three movable rollers 15 , a configuration in which the servomotors 25 are connected only to some movable rollers 15 is not excluded. When using an existing rotator, the servomotor 25 may be spaced apart from the movable roller 15 .

According to the detailed configuration of the present invention, the driving means 20 is a height adjuster 21 for varying the height of the fixed base 12 and the movable base 13, and the distance between the movable roller 15 of the fixed base 12 is varied It is characterized in that it further comprises a spacing adjuster (23).

1 and 2 , the lower height adjuster 21 is mounted between the base 11 and the fixture 12 , and the upper height adjuster 21 is mounted between the fixture 12 and the movable base 13 . do. Since the lower height adjuster 21 does not require precise position control, it is simply configured as a hydraulic actuator like a lift for transport. On the other hand, it is preferable to apply a ball screw or lead screw method for the upper height adjuster 21 . The gap adjuster 23 connects the two movable rollers 15 to a double helix shaft having a left-hand thread and a right-hand thread. The movable roller 15 is connected via each transfer nut, and the double helix shaft is connected to the geared motor. Accordingly, even if the standard (size) of the curved pipe is changed, it is possible to maintain the gripping posture by the movable roller 15 .

On the other hand, it is preferable to configure the height adjuster 21 and the interval adjuster 23 so that manual operation by the operator is possible in addition to the electric drive.

In addition, according to the present invention, the sensing means 30 has a structure for detecting the rotating state of the curved pipe and the movable roller 15 . Since the curved pipe has an eccentric structure, the rotational speed and rotational force (torque) fluctuate while being rotated on the movable roller 15 . The detection means 30 is provided to detect a factor that will affect the welding quality in the course of rotation of the curved pipe by the movable roller 15 .

According to the detailed configuration of the present invention, the sensing means 30 includes a speed detector 34 for detecting the rotation speed of the curved tube and the servomotor 25, and a torque detector 36 for detecting a torque acting on the servomotor 25. ) is characterized in that it is provided.

Referring to FIG. 3 , the circuit connection between the speed detector 34 and the torque detector 36 constituting the sensing means 30 is shown. The speed detector 34 may additionally use a speed sensor for detecting the surface speed of the curved pipe in the fixing table 12 in addition to the encoder mounted on the servomotor 25 . The torque detector 36 applies a method of detecting the current control state of the servo motor 25 , but a separate torque meter installed adjacent to the servo motor 25 may be additionally used. The controller 40 to be described later uses a signal generated by the sensing means 30 to determine the lack of rotational force that affects the welding quality of the curved pipe.

As a modified example of the present invention, the detection means 30 is characterized in that it further includes an image detector 38 for detecting the rotational posture of the curved pipe.

In FIG. 2 , the image detector 38 added to the sensing means 30 is installed on the upper end of the fixing table 12 . Even when the speed detector 34 and the torque detector 36 are used as the sensing means 30, there is a limit to increasing the rotation speed of the curved pipe in consideration of the delay caused by the calculation. The image detector 38 is configured based on a camera and detects a state in which the eccentric end of the curved tube is rotated as an image. By utilizing the signal of the image detector 38, it is possible to predict the torque fluctuation, so it is advantageous to prevent operation delay in connection with the speed detector 34 and the torque detector 36 and ultimately to increase the rotation speed of the curved pipe.

In addition, according to the present invention, the controller 40 forms a structure for controlling the driving means 20 in response to the signal of the sensing means (30). The controller 40 is preferably composed of a microprocessor, a memory, and a microcomputer circuit having an input/output interface. The sensing means 30 is connected to the input interface of the controller 40 , and the height adjuster 21 , the spacing adjuster 23 , the servo motor 25 and the like are connected to the output interface. The algorithm of the controller 40 is stored and executed in the form of programs and data in the memory.

Meanwhile, as shown in FIG. 3 , the sensing means 30 may include a pressure detector 32 . The pressure detector 32 detects a load acting on all or part of the movable roller 15 and is used as a signal for determining the loading, unloading, and overload state.

According to the detailed configuration of the present invention, the controller 40 is characterized in that the control of the height adjuster 21 and the interval adjuster 23 is selectively added based on the torque control by the current fluctuation of the servomotor 25. do.

When welding small and medium-sized curved pipes, the controller 40 is controllable with signals from the speed detector 34 and the torque detector 36 . When the torque is 0, the torque control of the servomotor 25 is not executed because the rotator is not in operation. When a torque greater than a certain value is generated and the speed is 0, the torque is increased by increasing the current of the set servomotor 25 because the rotational force of the rotator is insufficient. When rotating at a constant speed, since the curved pipe is rotating normally, the torque of the servomotor 25 is maintained at the current state.

If a large or special curved pipe is to be welded, it is preferable to add the signals of the pressure detector 32 and the image detector 38 . Since the controller 40 detects the rotational state of the curved pipe in real time and predicts the torque shortage time, the time according to the calculation is reduced to shorten the working time and improve safety.

The present invention is not limited to the described embodiments, and it is apparent to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the present invention. Accordingly, it should be said that such variations or modifications fall within the scope of the claims of the present invention.

10: body 11: base
12: fixed base 13: movable base
15: movable roller 20: driving means
21: height adjuster 23: spacer adjuster
25: servo motor 30: sensing means
32: pressure detector 34: speed detector
36: torque detector 38: image detector
40: controller

Claims (5)

A device for assisting rotational force for welding a curved pipe, comprising:
a main body 10 having a movable roller 15 for supporting the curved pipe on the fixed base 12 and the movable table 13;
a driving means 20 for applying a rotational force to the curved pipe by connecting a servomotor 25 to the movable roller 15;
sensing means 30 for detecting the rotating state of the curved pipe and the movable roller 15; and
Rotational force assisting device for welding a curved pipe, characterized in that it comprises; a controller (40) for controlling the driving means (20) in response to the signal of the detecting means (30). The method according to claim 1,
The driving means 20 further includes a height adjuster 21 for varying the height of the fixed base 12 and the movable base 13, and an interval adjuster 23 for changing the distance between the movable rollers 15 of the fixed base 12. A rotational force auxiliary device for welding a curved pipe, characterized in that it is provided. The method according to claim 1,
The sensing means (30) includes a speed detector (34) for detecting the rotation speed of the curved pipe and the servomotor (25), and a torque detector (36) for detecting the torque acting on the servomotor (25) A torque aid for welding of curved pipes. The method according to claim 1,
The detecting means (30) further comprises an image detector (38) for detecting the rotational posture of the curved pipe. The method according to claim 1,
The controller 40 is a rotational force auxiliary device for welding a curved pipe, characterized in that selectively adding the control of the height adjuster 21 and the gap adjuster 23 based on the torque control by the current fluctuation of the servomotor (25).

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