JPH032381Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a flange bolt hole positioning device for a flange welding device.

(Prior art and its problems) In the past, many pipes in piping systems for various mechanical devices were connected by flanges, and in the pipe processing and assembly department for these types of pipes, it was necessary to weld flanges to each end of the pipe. be.

In this case, the bolt holes in the first flange at one end of the pipe and the bolt holes in the second flange at the other end of the pipe are generally in the same phase (a positional relationship in which the axes of the corresponding bolt holes are parallel to the axis of the pipe). ), so when welding the second flange after welding the first flange, the second flange must be positioned to match the bolt holes of the first flange, or It is necessary to position the bolt holes in the first flange to match the bolt holes in the second flange.

In the past, it was difficult to automate the positioning of the bolt holes on the flange, and everything had to be done manually by workers, which required a lot of effort and time, and the bolt hole positioning accuracy was not sufficient. This has been an obstacle to the automation of automatic flange assembly.

(Means for Solving the Problems) The flange bolt hole positioning device for a flange welding device of the present invention provides a method for welding a first flange to one end of a pipe and then welding a second flange to the other end of the pipe. In the flange bolt hole positioning device for determining the position of the bolt hole of the pipe, there is provided a rotary drive device that rotates the pipe around its axis, and a rotary drive device that rotates the pipe around its axis, and a rotary drive device that rotates the pipe around its axis, and a rotary drive device that is arranged on both sides of the first flange of the pipe so that the optical axis is parallel to the pipe axis. A bolt hole detection device includes a light emitting section and a light receiving section that are provided opposite to each other, and detects the position of the bolt hole using light passing through the bolt hole of the first flange; and the bolt hole detection device. and a control device that receives a detection signal from the rotary drive device and controls the rotational drive device.

(Function) In the flange bolt hole positioning device for a flange welding device of the present invention, while the pipe is rotated around its axis by a rotary drive device, the bolt hole detection device consisting of a light emitting part and a light receiving part is used to detect the bolts of the first flange. The bolt hole of the first flange welded to the end of the pipe can be positioned at a desired position by detecting the position of the hole and controlling the rotary drive device by a control device that receives the detection signal.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 is a schematic plan view of an automatic flange assembly and welding device for automatically welding flanges to the ends of pipes, and the outline of this device is as follows.

Pipes P of various diameters and lengths are supplied onto the downward slope pedestal 1 from the front to the rear, and are scooped up by the swinging arm 2a of the pipe handling device 2 and placed on the rollers 3a and 3b of the rotary drive device 3. supplied to

The automatic flange supply device 4 includes a plurality of types of flange supply units 4a, and the flange supply unit 4a of the flange F according to the diameter of the pipe P.
is connected to the drive device 4b, the automatic flange supply device 4 moves to the imaginary line position, positions the right end of the pipe P, and attaches the flange F to the end of the pipe P.

When the flange F is attached to the end of the pipe P, the welding robot 5 temporarily welds the flange F to the pipe P, and after the automatic flange supply device 4 moves to the solid line position on the right, it rotates the pipe P. Device 3
The flange F is automatically welded to the pipe P by the welding robot 5 while rotating on the rollers 3a and 3b of the rotary drive device 3, and after welding is completed, the welding robot 5
The flanged pipe P is transferred to the unloading table 6 by swinging the flanges a and 3b with the air cylinder 3c and tilting them backward.

The pipe P on which the first flange F1 has already been welded to one end of the pipe as described above is also supplied to the flange automatic assembly and welding device, and the pipe P
A second flange F2 is welded to the other end.

In the flange automatic supply device 4, the flange F
Hold the flange F so that one of the bolt holes is located directly above the axis of the pipe P, and fit it onto the right end of the pipe P. In this state, the flange F is tack-welded to the pipe P.

By the way, in Fig. 1, the bolt holes of the first flange F1 already welded to the left end of the pipe P and the bolt holes of the second flange F2 welded to the right end of the pipe P are in the same phase (both flanges correspond to each other). In order to weld the second flange F2 so that the axis of the bolt hole is parallel to the axis of the pipe P, the following flange bolt hole positioning device is provided.

The flange bolt hole positioning device controls the rotational phase of the first flanged pipe P so that any bolt hole of the first flange F1 is located directly above the pipe axis, similar to the second flange F2. This flange bolt hole positioning device basically includes the rotation drive device 3 and the light emitting section 7a.
The bolt hole detection device includes a bolt hole detection device including a light receiving section 7b, and a control device that controls the rotation drive device 3 in response to a detection signal from the bolt hole detection device.

The rotary drive device 3 includes two pairs of four rubber rollers 3a and three pairs of metal idler rollers 3b that are rotationally driven by a motor 3A, and the pipe P is rotated at a predetermined speed by the rotation of the rubber rollers 3a. I'm starting to let them do it.

As shown in FIGS. 1 and 2, the bolt hole detection device is installed directly above the pipe axis above a bearing 3e that pivotally supports the rear end of the swing shaft 3d of the rotary drive device 3. A phototransistor or a photocell is disposed above the pipe P directly above the pipe axis between the rubber rollers 3a and the rubber rollers 3a so as to face the light emitter 7a with the light emitter 7a and the first flange F1 in between. The light receiver 7b is provided with a light receiver 7b located in front of and below the pipe P in parallel with the pipe P so as not to obstruct the supply of the pipe from the pipe handling device 2 to the rotary drive device 3. It is provided at the tip of a swinging arm 9 fixed to a swinging shaft 8 provided therein.

When the swing arm 9 is raised upward by rotating the swing shaft 8 via the lever with the air cylinder 10 (see FIG. 1), the light receiver 7b
is opposite to the light emitter 7a, its optical axis is parallel to the pipe axis and located above the pipe axis, and when the swing arm 9 is tilted downward, the light receiver 7b is located above the conveying surface of the pipe. It is now located lower.

The light beam emitted from the light emitter 7a is transmitted to the light receiver 7.
When the welding robot 5 enters b, the phototransistor and photocell become conductive, and the detection signal is output to a control device (not shown), which is commonly used by the welding robot 5. As shown in FIG. 2, the light emitter 7a and the light receiver 7b
When the pipe P is rotated at a low speed by rotating the rubber roller 3a with the motor 3A of the rotary drive device 3, one of the bolt holes 10 of the first flange F1 approaches right above the pipe axis. Light emitter 7a
When the light beam from the bolt enters the light receiver 7b through the bolt hole 10, the phototransistor and photocell in the light receiver 7b become conductive, so that the position of the bolt hole can be detected. That is, to explain in more detail with reference to FIG. 3, it is assumed that the position of the light beam B and the bolt hole 10 at the time when most of the light beam B from the light emitter 7a begins to pass through the bolt hole 10 is the position shown in the figure. Assuming that the time is t=0 and the bolt hole 10 moves to the position shown by the imaginary line when t=t, the following equation is obtained.

θ=(D/d)ωt−Δθ (1) However, the diameter of the pipe is d, the diameter of the rubber roller 3a is D, and the rotational angular speed of the rubber roller 3a is ω.

Therefore, when the bolt hole 10 is located directly above the pipe axis, in the above equation (1), if θ=0, (D/d)ωt−Δθ=0 (2) The above Δθ is the ray of light. Since it is a constant determined by the thickness of B, the diameter of bolt hole 10, and the radius from the pipe axis to the axis of bolt hole 10, at time t = Δθ (d/Dω) obtained from equation (2), Rubber roller 3a
When the rotation of the bolt hole 10 is stopped, the bolt hole 10 is positioned concentrically with the light beam B directly above the pipe axis.

The control device outputs a stop signal to the rotary drive device 3 to stop the rotary drive device 3 after the time t=Δθ(d/Dω) has elapsed from the time when the light receiver 7b became conductive. The rotation of P is stopped and the bolt hole 10 is positioned concentrically with the beam B.

Of course, it is also possible to position the bolt hole 10 at a desired position based on equation (1) above.

In addition, the positions of the light emitter 7a and the light receiver 7b with respect to the pipe axis can be freely adjusted by a position adjustment mechanism.
It can be applied to flanges F of various sizes.

The light emitter and the light receiver may be replaced with each other, or the light emitter and the light receiver may be integrated and a reflecting mirror may be provided at a position opposite to the light emitter with the flange F in between.

(Effect of the invention) In the flange bolt hole positioning device for a flange welding device of the present invention, as explained above, the first flange welded to the end of the pipe is rotated around the axis by the rotary drive device. A control device that detects the position of a bolt hole using a bolt hole detection device consisting of a light emitting section and a light receiving section that are arranged opposite to each other so that the optical axis is parallel to the pipe axis on both sides of the pipe, and receives the detection signal. Since the rotary drive device is controlled by the rotation drive device, the bolt holes of the first flange can be positioned at desired positions.

Moreover, since the light emitting part and the light receiving part can be placed with a sufficient distance between them as necessary, the bolt hole position can be reliably detected without any problem even if the length of the pipe is various. This is a highly versatile bolt hole positioning device.

If the positions of the light-emitting part and the light-receiving part with respect to the pipe axis can be adjusted, it can be applied to flanges of various sizes, resulting in an even more versatile device.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a schematic plan view of an automatic flange assembly and welding device, and FIG.
The figure is a schematic perspective view of the pipe and bolt hole position detection device, and FIG. 3 is an explanatory diagram for explaining bolt hole positioning. P...pipe, F1...first flange, F2...
...Second flange, 3...Rotary drive device, 3A...
Motor, 3a...Rubber roller, 7a...Light emitter,
7b...Receiver, 10...Bolt hole.

Claims (1)

[Claims for Utility Model Registration] A flange bolt hole positioning device for positioning bolt holes in the first flange when welding a first flange to one end of the pipe and then welding a second flange to the other end of the pipe, comprising: and a light emitting part and a light receiving part provided opposite to each other on both sides of the first flange of the pipe so that the optical axis is parallel to the pipe axis. a bolt hole detection device configured to detect the position of the bolt hole using light passing through the bolt hole of the first flange; and a control device configured to receive a detection signal from the bolt hole detection device and control the rotation drive device. A flange bolt hole positioning device for a flange welding device, characterized by comprising: