JPS5917512Y2 - Welding groove cleaning machine installed in capsule for penstock installation work - Google Patents

Description

[Detailed explanation of the invention] This invention is a capsule used in the capsule construction method, which installs penstocks by installing a capsule equipped with a dedicated work function on the inner surface of the iron pipe and systematically performing a series of installation operations. This article relates to a welding groove cleaning machine installed in a welding groove cleaning machine.

The on-site installation of penstocks involves a unique working environment due to the location and structure of the installation, and there has been an urgent need to streamline the work environment.

Recently, with the advent of pumped storage power plants, the scale of iron pipes has rapidly increased, and as thick plate high-strength steel has begun to be used as the main material, the need for it has increased even more.

Therefore, the "capsule construction method" is used to systematically install a series of installation tasks such as assembly, welding, inspection, and finishing by sequentially deploying various capsules equipped with special work functions on the inner surface of iron pipes.
However, it has been gradually adopted in penstock installation work because it has excellent features such as improving the working environment, increasing safety, homogenizing and high quality joint performance through automation, and improving efficiency through systemization and labor saving. It's starting to happen.

To explain the outline of the capsule construction method using Figure 1, iron pipe 1
``Assembly capsule''
and a "finishing cart" W for finishing and painting the inner surface of the iron pipe are connected in the above order by a telescopic connector 2 and placed inside the iron pipe 1.

Each of the above-mentioned capsules and one vehicle has equipment each having a dedicated working function mounted inside the cylindrical outer shell and on the upper end surface.
It can be fixed to the inner surface of the iron pipe and is supported by guide rollers 4 so that it can be moved in the direction of the axis of the iron pipe.

By lifting each of these capsules by the pitch of the iron pipe joint by a lifting device (not shown), the iron pipe joints assembled by the assembly capsule X are welded by the welding capsule Y, and then inspected by the inspection capsule Z. Finally, finishing is performed using the finishing cart W, and by sequentially moving the capsule group upward and repeating the above operation,
Installation of the penstock is completed.

Narrow gap MIG automatic welding is used for circumferential joints of iron pipes to improve welding efficiency, reduce welding heat input by reducing the amount of welded metal, homogenize joint performance, and improve quality. ing.

For this reason, it is necessary to accurately shape the groove shape of the joint assembled by the assembly capsule X into a predetermined shape and clean it before performing MIG welding using an automatic welding machine.

Normally, welding grooves are shaped and cleaned using a band grinder, etc., and then blown off polishing powder, etc. with a blower or compressed air. For cleaning work,
Iron pipes are laid out at an angle, and it is difficult to provide sufficient scaffolding for work, so cleaning the groove manually as described above is not only inefficient but also dangerous. There is a problem in that it is difficult to process with high precision, and as a result, uniform and high-performance joint performance cannot be obtained.

This invention solves the above-mentioned problems when installing penstocks using the capsule construction method, and enables groove shaping and cleaning to be performed efficiently, safely, and accurately. The purpose of the present invention is to provide a groove cleaning machine that can reduce costs by being used in combination with other equipment.

Hereinafter, this invention will be explained in detail with reference to drawings showing embodiments thereof.

As shown in FIGS. 2 and 3, the welding capsule Y is rotatable around a shaft 6 provided axially at the intersection of girders 5 provided in a cross shape on the upper end surface of the welding capsule Y, that is, at the axis of the capsule Y. A pivot arm 7 is pivotally supported.

A tandem automatic welding machine 8 is attached to one side of the arm 7, and the tip of its welding torch 9 is directed toward the welding joint 1a of the iron pipe 1.

The arm 7 is also provided below the welding device 8 with an arm rotation motor 10 and four pinions 11, two of which are rotated by the arm rotation motor 10 and at least one of which is rotated by the arm, in an umbrella shape.

On the other hand, an annular turning guide rail 12 centered on the axis of the capsule is provided on the inner surface of the upper end of the outer shell of the capsule Y, and two racks 13 are attached above and below each in an umbrella shape.
Each rack 13 is engaged with each pinion 11 described above.

Therefore, when the pinions 11 are rotated by the motor 10, the four pinions 11 roll on the rack 13, and the arm 7 pivots around the shaft 6.

In addition, welding power source 15 and control panel 16 necessary for automatic welding machine 8
, shield gas header 17, distribution board 18, etc. are capsule Y
is fixed inside.

At the other end of the arm 7, a mounting base 21 of the groove cleaning device 20 is mounted by means not shown so that its distance from the axis of the capsule can be adjusted.

The bevel cleaning device 20 consists of a disk-shaped grinder 22 and a blower 23 that rotate around an axis parallel to the axis of the capsule, and the grinder 22 can be moved forward and backward in the radial direction of the capsule by a bundle 24. There is.

Also, a nozzle (not shown) provided at the outlet of the blower 23
The tip of the groove faces the groove 1a.

A workbench 25 for operating the welding machine 8 and the groove cleaning machine 20 is attached to the arm 7 near the respective devices so as to keep it horizontal at all times.

Since this device is configured as described above, after the welding capsule Y is fixed and fixed to the inner surface of the iron pipe 1 by the fixing device 3, the position of the groove cleaner 20 is adjusted to a position that matches the inner diameter of the iron pipe 1. In this case, the grinder 22 first assembles the capsule
It comes to a position opposite to the circumferential joint 1a of the iron pipe 1 which has been misaligned.

Since the rotation axis of the grinder 22 is held completely parallel to the axis of the capsule Y, in other words, the axis of the iron pipe 1,
By making the slopes of the upper and lower surfaces of the grinder 22 match the slopes of both sides of a predetermined groove, the groove can be completely shaped into the predetermined shape by gradually advancing the grinder by operating the bundle 24. can.

The tip of the blowing nozzle of the blower 23 faces the groove, so by jetting air after shaping the groove or in parallel with the polishing operation, polishing powder and other foreign substances are blown away and removed from the groove. will be thoroughly cleaned.

Therefore, by driving the arm rotation motor 10, the arm 7
By rotating the groove, the groove can be shaped and cleaned continuously over the entire circumference of the circumferential joint 1a of the iron pipe 1.

By making all of the guide rollers 4 of the capsule Y, or all but the lower two in the cross section perpendicular to the axis, expandable and retractable in the radial direction of the capsule, the capsule can be used for general purpose installation of iron pipes with inner diameters within the range. It becomes possible to do so.

In that case, the distance from the axis of the capsule to the groove will naturally change, but after cleaning the groove, the distance from the axis can be adjusted, so the groove cleaning work for iron pipes with inner diameters within the above range is possible. It becomes possible.

In addition, if only a part of the guide roller of the capsule is made expandable and retractable to accommodate changes in the inner diameter of the iron pipe, the axis of the capsule and the axis of the iron pipe will not coincide but be parallel, but even in that case, the axis of the arm By moving the groove cleaning machine forward and backward according to the rotation position, the groove cleaning machine can always be moved along the inner surface of the joint of the iron pipe, so the groove shaping and cleaning work can be carried out continuously over the entire circumference. All you can do is do it.

Note that even if the axis of the arm is offset from the center of the cup cell, construction can be performed in the same manner.

As described above, according to the present invention, the groove shaping and cleaning work of the on-site welded joint of the penstock, which is installed using the capsule construction method, can be carried out extremely easily and with high precision.

Welding groove cleaning work is performed prior to welding work, and since welding is not performed at the same location at the same time, it is okay to use the rotating mechanism such as the rotating motor, rack, and pinion for these devices. It is possible to achieve significant cost reductions and space savings by using both the calyx and the calyx.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the capsule construction method for general penstock installation work, Fig. 2 is a side view showing an embodiment of the present invention, and Fig. 3 is a plan view seen in the direction of arrow III shown in Fig. 2. It is. 1... Penstock, 1a... Welding groove, 6... Shaft,
7... Swivel arm, 8... Welding machine, 10... Arm swing motor, 20... Welding groove cleaner, 22...
Grinder, 23...Blower

Claims (1)

[Scope of utility model registration request] It is used in the capsule construction method, which installs a penstock by installing a capsule equipped with a dedicated work function on the inner surface of the iron pipe and systematically performing a series of installation operations. In a welding groove cleaning machine that is installed in a capsule that is arranged in such a way that the A welding groove cleaner section having a disk-shaped grinder and a blower that rotates around an axis parallel to the above-mentioned axis is attached to the tip of the arm, and a welding machine is attached to the tip of the other arm. Features: Welding groove cleaning machine.