JPH0686008B2 - Automatic welding equipment for valve seats such as gate valves and check valves - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is designed to remove a defective valve seat by other means while removing a sluice valve, a check valve, etc. installed in a piping system of a power plant or the like from a pipe. , Relates to an automatic valve seat welding apparatus for welding a new valve seat to a valve box.

[0002]

2. Description of the Related Art Conventionally, a sluice valve or a check valve installed in a piping system of a power plant or the like is formed by welding a valve seat ring made of a hard metal material in a valve box in a substantially horizontal direction. However, in actual use, the valve seat seat surface is easily damaged. Therefore, to replace this valve seat, remove the entire valve from the piping system, then take it back to a specialized factory and use a lathe or boring device to remove the defective valve seat ring from the valve box and replace it with a new valve seat. After fitting the ring to expose the tip of the welding torch to the joint between the valve box and the valve seat ring, rotate the valve box supported by the positioner in the circumferential direction of the valve seat to move the valve seat ring to the valve box. Are welded to.

[0003]

However, when the valve is brought back to the factory and the valve seat is replaced, not only the cost is significantly increased, but also the delivery date of the repaired product is delayed, which causes the line to be replaced. There is a strong demand from the user side especially to replace the valve seat on-site because the suspension period will be long.

However, in the conventional welding device used in the factory, since the valve box needs to be rotated by the positioner, the entire device becomes large and the transportation work to the site becomes large. Even when used locally, in order to rotate the valve box with the positioner, the valve box had to be disconnected from the piping, and the work required a great deal of work, and there were still problems to be solved. .

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention has a base frame which can be attached to the upper edge of a valve box and in which a supporting member of a welding head is horizontally movably supported. A mechanism, a swivel mechanism in which a drive sprocket and a transmission sprocket mounted below the support member are synchronously rotated to rotate a rotary disc that is interlocked with the transmission sprocket, and a tip of a torch attached to the rotary disc is welded. It is said that an automatic welding device for a valve seat is configured by a welding head that is made to face the site and a monitoring device that makes the camera head connected to the camera body outside the valve box with a fiber cable near the tip of the torch. Adopted means.

[0006] Further, a carriage that moves up and down along a rail has a camera body connected to a gas hose of a torch, a wire filler and a fiber cable (hereinafter also referred to as "cable etc.") of a camera head and a wire feeder. A means of vertically setting the feeding mechanism above the valve box was also used.

[0007]

In the welding apparatus of the present invention, the welding head is inserted into the valve box that is still installed in the piping system, and the supporting member of the feed mechanism is moved in the horizontal direction, so that the torch tip of the welding head is positioned at the welding position. Can be faced with. Further, by rotating the turntable through the sprocket, the tip of the torch accurately makes one revolution along the welding site, and
The camera head facing the tip of the torch has the function of displaying the welded portion.

Further, the one provided with the feeding mechanism has an action of preventing the carriage from moving up and down as the welding head rotates, and preventing the cables or the like from being loosened or strongly pulled.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described in more detail with reference to the embodiments shown in the drawings. 1 is a base frame which can be fixed to a flange (F) at the upper end of a valve box (B), and 2 is the above base. A feed mechanism of a welding head mounted on the frame 1, wherein a sleeve 4 is screwed onto a screw rod 3 laid horizontally, that is, in the Y direction in FIG. 1, and is supported on the outer periphery of the sleeve 4. The detent 7 that can be engaged is attached to the guide groove 6 at the center of the upper edge of the member 5, while the limit switches 8 and
8 is provided with a protrusion plate 9 which can contact the actuator. Further, 10 is a mounting plate fixed to the lower end of the support member 5, 11 is a turning mechanism,
A drive sprocket 12 connected to the motor 13 via gears 14 and 14 'above the shaft, and the drive sprocket 12 and a transmission sprocket 15 supported below the mounting plate 10 via a tension sprocket 16. On the other hand, while being connected by 17, a turntable 18 is provided on the same axis as the transmission sprocket 15 so that they both rotate integrally.

Further, 19 is a welding head attached to the rotary disc 18, the base end of the torch 20 is fixed in the diametrical direction of the rotary disc 18, and the tip thereof faces the peripheral surface of the valve seat (S). This is what I did. Reference numeral 21 is a wire-shaped filler material, the tip of which is located near the tip of the torch 20, and the base end side of which can be wound around a reel 30 and fed out through a wire feeder 31. Reference numeral 22 denotes a camera head of the monitoring device, which faces the tip of the torch 20 so that the welding condition can be monitored or photographed, and is connected to the camera body 23 installed outside the valve box (B) by a fiber cable 22 '. It was done.

Next, an example of the feeding device for the gas hose 20 ', the filler material 21, and the fiber cable 22' connected to the torch 20 will be described mainly with reference to Figs. 2, a rail and a screw rod provided along the supporting channel member 26 erected above 2, and a handle 27 configured to control the rotation of the screw rod 25 via a bevel gear 28 meshed with the lower end thereof.
Reference numeral 29 denotes a dolly that carries the camera body 23, the wire feeder 31, and the reel 30 and moves on the rail 24.
The lower surface is screwed into a screw rod 25 so that the screw rod 25 can be moved up and down by its rotation.

Next, the use procedure and function of the welding apparatus of the present invention will be described. First, the bonnet of the sluice valve or the like that is still attached to the piping of the power plant or the like is removed, and the valve seat ring damaged by an appropriate cutting device is removed. It is cut off and a new valve seat ring (S) is fitted in the valve seat position of the valve box (B). Subsequently, the base frame 1 is placed on the flange (F) of the valve box (B), the feed mechanism 2 is provided above the base frame, and the turning mechanism 1 is provided at the lower end thereof.
After mounting 1 of each, the center position of the rotary disk 18 of the turning mechanism and the center of the valve seat ring (S) are aligned, and the base frame 1 is fixed to the flange (F). After that, the screw rod 3 of the feed mechanism 2
When is rotated, the support member 5 which is screwed with the threaded rod via the sleeve 4 moves in the Y direction because the detent 7 is engaged in the guide groove 6, so that the tip of the torch 20 moves toward the valve. When the joint between the seat (S) and the valve box (B) is reached, the rotation of the screw rod 3 is stopped to stop the welding head 19, and the tip of the torch 20, the filler material 21, and the camera head 22 are respectively attached. Face the welding position of both members.

Next, before moving on to the welding work, if the power of the surveillance camera 23 is turned on and the motor 13 is operated to rotate the drive sprocket 12, the transmission sprocket 12 connected by the chain 17 rotates, and Since the fixed turntable 18 also rotates at a constant speed, the rotation status of the torch 20 can be confirmed by the camera head 22.

At this time, the gas hose 20 ′ of the torch 20, the filler material 21 and the fiber cable 22 ′ of the camera head 22 move as the welding head 19 rotates. Since the carriage 29 such as 23 moves up and down, the cables and the like are not strongly pulled or loosened. Next, after confirming that the tip end of the torch 20 accurately orbits along the welded portion, the torch is ignited, and the torch is swung by the above-mentioned procedure to rotate the valve seat ring (S) and the valve box ( The joint portion with B) is sequentially welded, and when the torch 20 makes one revolution and the entire circumference is welded, the rotation and the arc generation are stopped. Then, after further rotating the welding head and confirming the welding state with the camera head 22, the feed mechanism 2 is operated to retract the welding head 19, and the welding head 19 is once taken out from the valve box.
After rotating it by 0 °, it is inserted into the valve box and made to face the valve seat on the opposite side, and the welding operation of the other valve seat is performed by the above-mentioned procedure.

Since the moving distance of the welding head feed mechanism 2 in the present embodiment is regulated by the limit switch 8, the welding head 19 will not accidentally collide with the valve seat. On the other hand, as the moving means of the supporting member 5, in addition to the one using the screw rod 3 and the sleeve 4 shown in the above example, the structure is not particularly limited, for example, the supporting member 5 can be controlled by a cylinder. Absent.

Further, the gas hose, the filler, and the fiber cable feeding mechanism are not limited to those in which the cart having the camera and the like is vertically installed above the valve box as in the above example. You may make it move to. In short, the structure thereof is not particularly limited as long as it can follow a cable or the like that moves with the rotation of the welding head.

[0017]

As described above, the automatic welding apparatus for a valve seat according to the present invention makes it possible to horizontally move and rotate the welding head inserted in the valve box, and at the same time, to display the welding condition on the welding head. Because it has a camera to monitor,
A new valve seat can be welded to the valve box as it is without removing the valve box installed in the piping system of the power plant or the like. Therefore, it is not necessary to bring the valve back to the factory as in the conventional case, the repair cost is reduced, and the delivery date of the repaired product is accelerated, so that the suspension period of the piping system can be significantly shortened.

Further, according to the welding apparatus of the present invention, since it is not necessary to rotate the valve box by the positioner as in the conventional apparatus, the entire apparatus becomes compact and it is extremely easy to use on site.

In addition, since the one provided with the feeding mechanism for the cable or the like can smoothly perform the feeding operation for the cable or the like, it is not cut in the valve box or entangled with other members. , Exerts an excellent effect.

[Brief description of drawings]

FIG. 1 is a front view showing a cutaway view of a part of the present invention;

FIG. 2 is a side view thereof,

FIG. 3 is a front view showing a state in which a feeding device is attached,

FIG. 4 is a partially enlarged side view thereof.

[Explanation of symbols]

 1 Base Frame 2 Feed Mechanism 5 Support Member 11 Turning Mechanism 12 Drive Sprocket 15 Transmission Sprocket 18 Rotating Plate 19 Welding Head 20 Torch 22 Camera Head 23 Camera Main Body 24 Rail

Claims (2)

[Claims] 1. A feed mechanism 2 for supporting a supporting member of a welding head 19 movably in a horizontal direction on a base frame 1 attachable to the upper edge of a valve box, and a drive sprocket mounted below the supporting member. And a rotating mechanism capable of rotating the rotating disc 18 that is interlocked with the transmitting sprocket by synchronously rotating the transmitting sprocket, and a welding head configured so that the tip of the torch 20 attached to the rotating disc faces the welding site. An automatic valve seat for a sluice valve, a check valve, etc., characterized in that it comprises a camera body 23 outside the valve box and a camera head 22 connected by a fiber cable to a monitoring device facing the tip of the torch. Welding equipment. 2. A valve seat of a sluice valve, a check valve, etc. according to claim 1, wherein a feed mechanism for moving a camera body connected to a fiber cable etc. along a rail 24 is attached to a valve box. Automatic welding equipment.