KR102094104B1 - Automatic welding apparatus for pipe inside using strip electrode - Google Patents

Abstract

The present invention relates to an automatic welding device for an inner surface of a pipe using a strip electrode, which, in the case that a welding unit is formed along the circumference of an inner surface of a circular pipe, can easily adjust a back-and-forth location of a welding torch which grips a strip electrode for welding, such that the welding location of the strip electrode can be moved in accordance with the diameter of the pipe of which the inner surface is to be welded, thereby guaranteeing uniformity and high quality of welding. To this end, the present invention comprises: a moving trolley which has a front wheel at the front and a rear wheel at the rear in order to be operated while being rolled along the circumference of the inner surface of a pipe; a strip supply unit which is installed at the upper portion of the rear of the moving trolley, and uniformly supplies a strip electrode wound in a roll shape; a vertical slide unit coupled to the upper portion at the center of the moving trolley, and slidably operated in a vertical direction; a right and left slide unit which is coupled to the vertical slide unit to be vertically slid along therewith, and is slidably operated in right and left directions around the vertical slide unit; a back and forth slide unit which is coupled to the right and left slide unit to be slid in right and left directions along therewith, and is slidably operated in a back-and-forth direction around the right and left slide unit; a welding torch which is coupled to the back and forth slide unit, and receives the strip electrode from the strip supply unit to generate an arc after power is applied in order to perform arc-welding; and a flux supply unit which is coupled to the right and left slide unit by using a bracket as a medium to be located at the upper portion of the front of the welding torch, and supplies a flux to block the arc generated by the welding torch from external air.

Description

Automatic welding device for pipe inner surface using strip electrodes {AUTOMATIC WELDING APPARATUS FOR PIPE INSIDE USING STRIP ELECTRODE}

The present invention relates to an automatic welding apparatus using a strip electrode that continuously supplies a strip electrode to a welding torch to automatically perform a welding operation. More specifically, the inner circumference of a circular pipe is not welded on a flat surface. Accordingly, the present invention relates to an automatic welding device for an inner surface of a pipe using a strip electrode on which a welding part is formed.

In general, welding techniques used in industrial sites are classified into welding, pressing, and soldering. Among them, the welding methods that are most widely used in manufacturing processes such as shipbuilding, plants, and iron structures are subdivided and consumed depending on whether or not the electrode used is consumed. It is classified into the expression and non-consumable welding methods.

Among the double consumable welding methods, there are typically a covered arc welding, a gas metal arc welding, and a submerged arc welding. Here, the submerged arc welding is a method of welding two or more objects to be joined with heat obtained by generating an arc between a working electrode and a base material inside a flux of granular flux, which is previously stacked on the base material. Welding is performed by continuously supplying a working electrode through which current flows.

At this time, the arc is covered by the flux and is invisible from the outside, and the flux blocks the atmosphere to protect the welding metal during refining and contributes to the formation of weld beads or slags. Such submerged arc welding is used as a high-efficiency joining technique for deep-thick and thick-plate structural steels because of the large size of the electrode used, so the current is large. Looking at such applications, ship building, steel pipe manufacturing, and fabrication of general steel structures It is often used for butt joints, fillet joints, and overlay welding.

Consumable electrodes used in the submerged arc welding include a wire electrode and a strip electrode.

First, in the case of using a wire electrode, even if the diameter of the pipe is small and the thickness is small, even if a wire electrode is supplied and welded to a single welding torch, there is no problem in welding speed or welding efficiency. In addition, even when the diameter of the pipe is gradually increased and the thickness is also increased, there are cases in which a plurality of welding electrodes is supplied to supply a plurality of wire electrodes to increase the welding portion. For example, there is a 'submerged welding device' of Korean Patent Publication No. 10-2013-0070851, a 'submerged arc welding apparatus of steel plate butt' of Korean Patent No. 10-1925186 and Korean Patent No. 10-1925187. .

Next, when the diameter of the pipe is a large diameter, and the thickness is also thick, the welding efficiency is inevitably limited even if a plurality of electrodes are used as wire electrodes. Therefore, a welding electrode having a large area can be formed using a strip electrode formed of a plate-shaped strip to maximize welding efficiency. At this time, in welding using the strip electrode, the position of the supplied strip electrode must be fixed so as not to be shaken, and prior art related to the welding head or welding torch that holds the strip electrode so that the position is not deformed is widely known, Among them, the 'portable strip automatic welding device' of Patent No. 10-1332393 is representative.

Here, when the automatic welding device using the strip electrode is used for flat plate butt welding or fillet welding in which a welding portion is formed on a flat surface as shown in FIG. 1, it is sufficient to hold only the position at the time of supply of the strip electrode (S). . However, when the welding portion is formed along the circumference of the inner surface of the circular pipe P, as shown in FIGS. 2 to 4, in the case of welding using the strip electrode S in the pipe inner butt welding or the pipe inner overlay welding, When the welding position of the strip electrode S is changed according to the diameter of the pipe P, there is a problem that high-quality welding beads are formed.

That is, as shown in FIG. 2, when the diameter of the pipe P is 2000 mm to 2500 mm, the strip electrode S is welded torch 25 mm to 30 mm from the center of the pipe P to the front 25 mm to 30 mm based on the lower point on the vertical line. It should be welded through (10), and as shown in Figure 3, the diameter of the pipe (P) is from 3000mm to 4000mm, 35mm to 40mm, as shown in Figure 4, the diameter of the pipe (P) is 5000mm The strip electrode (S) should be welded forward 50 mm.

When the strip electrode (S) is welded to a desired position according to the diameter of the pipe (P), the weld bead is welded when the shape of the weld bead is formed, that is, the welding quality is straight, but is supplied from the position forward or backward. There is a problem in that the shape of the floating or convex from the base material can not be properly welded.

Therefore, if the automatic welding device using the strip electrode according to the prior art is simply used, the welding torch 10 for gripping and welding the strip electrode S as shown in FIGS. Since it is fixed as a standard, the operator must push the moving cart 20 forward from the rear. That is, the welding position of the strip electrode S through the welding torch 10 must be manually adjusted by the operator, and there is a problem in that the worker must continuously push or pull the moving cart 20 while welding is in progress. Therefore, if the worker neglects to push or pull the moving cart 20 for a moment while welding is in progress, the welding bead is incorrectly formed, leading to deterioration of quality and basically guaranteeing uniformity of quality. There is a problem that cannot be done.

The object of the present invention, devised to solve the above problems, is to easily adjust the front and rear positions of the welding torch by gripping the strip electrode when the welding portion is formed along the circumference of the inner surface of the circular pipe to weld the inner surface. The object of the present invention is to provide an automatic welding device for the inner surface of a pipe using a strip electrode capable of ensuring uniformity and high quality of welding quality by moving the welding position of the strip electrode according to the diameter of the pipe.

To achieve the above object, the automatic welding device for the inner surface of a pipe using a strip electrode according to the present invention includes a moving bogie equipped with a front front wheel and a rear rear wheel so as to roll over the inner circumference of the pipe, and the movement It is installed on the rear upper portion of the bogie, the strip supply unit for constantly supplying the strip electrode wound in the form of a roll, the upper and lower slide units coupled to the center upper portion of the mobile cart to slide up and down, and the upper and lower slide units. Sliding up and down together, and a left and right slide portion for sliding from side to side based on the up and down slide portion, and a front and rear slide portion coupled to the left and right slide portion to slide left and right together, and sliding back and forth based on the left and right slide portion, It is coupled to the front and rear slide portion, the strip from the strip supply A welding torch that receives an electrode and generates an arc according to the application of power, and arc welding, is coupled via a bracket to the left and right slide parts so as to be located on the front upper portion of the welding torch, and the arc generated from the welding torch is external. It comprises a flux supply for supplying the flux to block from the air.

In addition, the mobile cart is characterized in that each of the front wheel and the rear wheel is provided with a pair of left and right, and power is transmitted to the rear wheel to drive the rear wheel.

In addition, the mobile cart is characterized in that the rear wheel wheel is provided with a pair of left and right, and the front wheel wheel is provided with one on the left.

In addition, the moving cart is characterized in that it further comprises a driving direction adjustment handle for rotating the front wheel wheels in the left and right directions so as to be able to adjust the driving direction from side to side.

In addition, the mobile cart is characterized in that it further comprises a parking support for contacting and supporting the floor surface when parking on the right side corresponding to the front wheel.

In addition, the parking support unit is coupled to the lower end of the parking bolt, and the parking bolt that moves up and down according to the left and right rotation, the pressing bolt to press and fix the side of the parking bolt, and the parking bolt according to the elevation of the parking bolt Characterized in that it comprises a parking nut spaced or adjacent to the bottom surface.

The automatic welding device for the inner surface of a pipe using a strip electrode according to the present invention can easily adjust the front and rear positions of the welding torch by gripping the strip electrode through the front and rear slide parts when the welding part is formed along the circumference of the circular pipe inner surface. According to the diameter of the pipe to be welded, the welding position of the strip electrode is moved to ensure uniformity and high quality of welding quality.

Particularly, a three-wheel structure is formed through a pair of rear wheel wheels and a single front wheel driving the moving cart, and the driving direction of the moving cart can be easily adjusted by rotating the front wheel to the left and right by a driving direction adjusting handle. It works.

In addition, in the case of forming the three-wheel structure of the mobile bogie, the mobile bogie does not easily fall when parking the mobile bogie through a parking support including a parking bolt, a compression bolt, and a parking nut, so that the mobile bogie can be firmly parked.

1 is a side view schematically showing a welding process when a welding portion is formed on a plane by an automatic welding device using a strip electrode according to the prior art,
2 to 4 is a side view schematically showing the welding process for each diameter of the pipe when the welding portion is formed along the circumference of the inner surface of the circular pipe by an automatic welding device using a strip electrode according to the prior art,
5 is a perspective view showing an embodiment of an automatic welding device for the inner surface of a pipe using a strip electrode according to the present invention,
6 is a side view of the embodiment of FIG. 5,
7 is a plan view of the embodiment of FIG. 5,
8 to 10 are side views schematically showing a welding process in the case where a weld is formed along the circumference of the inner surface of a circular pipe by an automatic welding device for the inner surface of a pipe using a strip electrode according to the present invention,
11 is a perspective view showing another embodiment of an automatic welding device for the inner surface of a pipe using a strip electrode according to the present invention,
12 is an enlarged perspective view of a main portion of the embodiment of FIG. 11 showing the front wheel, the driving direction adjusting handle, and the parking support.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the automatic welding device for the inner surface of the pipe using the strip electrode according to the present invention.

Automatic welding device for the inner surface of a pipe using a strip electrode according to the present invention, as shown in FIGS. 5 to 7, the moving cart 100, the strip supply unit 200, the upper and lower slide units 300, the left and right slide units 400, It comprises a front and rear slide unit 500, a welding torch 600 and a flux supply unit 700, the mobile cart 100 includes a front wheel wheel 110 and a rear wheel wheel 120. In addition, as illustrated in FIGS. 11 and 12, the mobile cart 100 may further include a driving direction adjusting handle 130 and a parking support 140, and the parking support 140 includes a parking bolt 141. , It may include a pressure bolt 142 and the parking nut 143.

The moving vehicle 100 is provided with a front front wheel 110 and a rear rear wheel 120 to perform rolling operation along the inner circumference of the pipe P as shown in FIGS. 5 to 10. First, as shown in FIGS. 5 to 7, the mobile cart 100 is provided with a pair of left and right wheels 110 and rear wheels 120, respectively, and power is transmitted to the rear wheels 120 It can drive rear wheel.

The four-wheel structure of the mobile carriage 100 is a structure widely used in an automatic welding device for moving clouds, and is a structure capable of stable parking and forward movement at four points of the four-wheel. However, the four-wheel structure of the mobile bogie 100 is easy to advance in one direction, but there is a problem that it is difficult to adjust the driving direction of the mobile bogie 100, and such problems can be solved through a tri-wheel structure, which will be described later.

The strip supply unit 200 is installed on the rear upper portion of the mobile cart 100, as shown in Figures 5 to 7, and constantly supplies the strip electrode (S) wound in the form of a roll. The strip electrode (S) is a strip formed of a strip of a plate to maximize the welding efficiency by forming a large-area welding part, and is wound in a roll form to the strip supply part (200) to be supplied to the welding torch (600) described later. It is released constantly.

The upper and lower slide portions 300 are coupled to the upper center of the moving cart 100 to slide up and down, and the left and right slide portions 400 are coupled to the upper and lower slide portions 300 to slide up and down together, and the upper and lower sides. Sliding left and right based on the slide portion 300. Here, the upper and lower slide portion 300 and the left and right slide portion 400 is for accurately holding the welding position of the welding torch 600 to be described later, and moving the welding torch 600 up and down and left and right to determine the welding position. do.

Basically, the base material welded by the welding torch 600 is, for example, flat butt welding or fillet welding in which a welding part is formed on a plane with reference to FIG. 1, and when the welding starts through the welding torch 600, the left and right slide parts By operating 400, the left and right positions of the welding torch 600 are determined based on the moving cart 100, and the upper and lower slide portions 300 are operated to bring the welding torch 600 closer to the welding portion.

However, when the welding portion is formed along the circumference of the inner surface of the circular pipe P, the welding position of the welding torch 600 should not be fixed in the butt welding or the inner pipe overlay welding with reference to FIGS. The optimum welding quality can be obtained by changing the temperature. At this time, when using a welding torch 600 with a fixed front-rear position relative to the moving cart 100, the operator must adjust the optimal welding position of the welding torch 600 by pushing or pulling the moving cart 100 from behind. , Since the mobile cart 100 is inclined forward or backward, the worker must continuously push or pull the mobile cart 100 even during the welding process.

Accordingly, there is a problem that at least two to three workers must be attached to push or pull the mobile cart 100 forward or backward, and also to examine the welding process, and also to grasp the driving path of the mobile cart 100 as well. It is. This leads to a decrease in welding quality and a sharp decrease in productivity. It is the present invention that came out to solve such a problem, and this problem is dramatically solved through the front-rear slide unit 500.

That is, the front and rear slide portion 500 is coupled to the left and right slide portion 400 and slides left and right together, and slides back and forth based on the left and right slide portion 400. A welding torch 600, which will be described later, is coupled to the front and rear slide portion 500, so that the welding torch 600 can be moved back and forth based on the moving cart 100. As a result, the welding torch 600 moves up and down through the up and down slide part 300 based on the moving cart 100, moves left and right through the left and right slide part 400, and moves the front and rear slide parts 500. It allows you to move back and forth.

The welding torch 600 is finally coupled to the front and rear slide parts 500, receives the strip electrode S from the strip supply part 200, generates arcs according to the application of power, and performs arc welding.

The flux supply unit 700 is coupled via the bracket 710 to the left and right slide units 400 so as to be positioned on the front upper portion of the welding torch 600, and the arc generated from the welding torch 600 is transmitted from outside air. The flux is supplied to shut off. The flux supply unit 700 may also be combined with the welding torch 600, but considering the weight of the welding torch 600 and the weight of the flux supply unit 700, the flux supply unit 700 is coupled to the left and right slide units 400. And, the welding torch 600 is a structure in which the weight supported by being coupled to the front and rear slide portions 500 for holding the final welding position is dispersed.

Since the welding position of the welding torch 600 can be easily adjusted back and forth through the front and rear slide portion 500, the welding position of the welding torch 600 is optimal according to the diameter of the pipe P to be welded. It is possible to work in a position, and in particular, a plurality of workers do not need to push or pull the moving cart 100 in order to hold the welding position, thereby bringing uniformity of welding quality and productivity improvement.

Looking at the welding process of the automatic welding device for the inner surface of the pipe using the strip electrode according to the present invention provided with the front and rear slides 500 with reference to FIGS. 8 to 10, first, as shown in FIG. 8, the bottom of the inner surface of the pipe P The mobile cart 100 is not tilted forward or backward, and is placed so that the lower end of the front wheel 110 and the lower end of the rear wheel 120 are horizontal. In addition, the upper and lower and left and right positions of the welding torch 600 are determined through the upper and lower slide portions 300 and the left and right slide portions 400.

Next, after confirming the diameter of the pipe P as shown in FIG. 9, the front and rear slides 500 are operated based on the lower point on the vertical line from the circle center of the pipe P according to the diameter of the pipe P. The front and rear positions of the welding torch 600 are adjusted. For example, when the diameter of the pipe (P) is 2000mm to 2500mm, the strip electrode (S) should be welded through the welding torch (600) to the front 25mm to 30mm based on the lower point on the vertical line from the circle center of the pipe (P). And, if the diameter of the pipe (P) is 3000mm to 4000mm, 35mm to 40mm forward, and if the diameter of the pipe (P) is 5000mm, the strip electrode (S) should be welded forward 50mm.

Finally, as shown in FIG. 10, when it is determined to the front and rear positions of the welding torch 600, while rotating the pipe P, the rear wheel wheel 120 of the moving cart 100 is adjusted to the rotational speed of the pipe P. Drive to maintain the current position. Finally, the flux is supplied from the flux supply unit 700 toward the welding torch 600, and at the same time, the strip electrode S is supplied from the strip supply unit 200 to the welding torch 600, thereby generating an arc according to the application of power to generate an arc. It is to perform welding. In this case, one worker can perform all the above-described welding processes without the need for a plurality of workers.

On the other hand, a pair of front wheels 110 and rear wheels 120 are provided on the mobile carriage 100 to have a four-wheel structure, and when pipe butt welding is performed, the cutting surfaces between pipes P are completely on the same plane. That is, it does not draw a circle, and even when the moving vehicle 100 travels along the inner surface of the pipe, the traveling path is easily distorted by foreign matter such as tips or burrs protruding from the traveling path.

Therefore, as shown in FIGS. 11 and 12 so that the driving route of the mobile cart 100 can be easily adjusted, the mobile cart 100 is provided with a pair of left and right wheels 120 and the front wheel wheel ( 110) This may have a three-wheel structure with one on the left. In the case of the three-wheel structure in which the front wheel 110 is composed of a single one, there is a great advantage that the driving path of the moving cart 100 can be easily adjusted by just fine-tuning the left and right of the front wheel 110.

At this time, the moving cart 100 may further include a driving direction adjusting handle 130 for rotating the front wheel wheel 110 in the left and right directions so as to adjust the driving direction left and right as shown in FIGS. 11 and 12. have. The driving direction adjusting handle 130 adjusts the driving direction of the moving cart 100 from side to side by gripping by hand and rotating from side to side. This is because the automatic welding device for the inner surface of the pipe using the strip electrode according to the present invention is provided with the above-described front and rear slide parts 500, so that the welding position of the welding torch 600 is optimally positioned according to the diameter of the pipe P. Alignment, it is possible to implement this because a single operator has a great advantage of performing welding by adjusting only the driving direction adjusting handle 130 from side to side.

In addition, when the mobile cart 100 has a three-wheel structure, an operator is attached to perform welding during welding, but there is a fear that the parking vehicle may fall and be damaged by an impact in a standing state. In order to prevent this, as shown in FIGS. 11 and 12, the mobile carriage 100 further includes a parking support 140 that contacts and supports the floor surface when parking on the right side corresponding to the front wheel 110. You can.

That is, the parking support 140 includes a parking bolt 141 that moves up and down along the left and right rotation, a compression bolt 142 that presses and fixes the side surface of the parking bolt 141, and the parking bolt 141 It is coupled to the lower end of the parking bolt 141 may include a parking nut 143 spaced apart or adjacent to the bottom surface according to the elevation. Accordingly, when the mobile cart 100 is parked, the parking bolt 141 is lowered so that the parking nut 143 comes into close contact with the floor surface, and thus a single front wheel 110 and a pair of rear wheels 120 are provided. Together, the four-point support structure is made, and when the mobile cart 100 moves, the parking bolt 141 is raised so that the parking nut 143 is spaced apart from the floor surface. It is to facilitate. At this time, the pressing bolt 142 is to fix the upper and lower positions of the parking bolt 141 by shaking by pressing and fixing the side surface of the parking bolt 141 when the parking bolt 141 is raised or lowered.

As described above, the automatic welding device for the inner surface of a pipe using the strip electrode according to the present invention, when the welding portion is formed along the inner circumference of the circular pipe (P), grips the strip electrode (S) through the front and rear slide portions (500). Since the front and rear positions of the welding torch 600 to be welded can be easily adjusted, the welding position of the strip electrode S can be moved according to the diameter of the pipe P to be welded on the inner surface, thereby ensuring uniformity and high quality of welding quality. It has an effect.

In particular, a three-wheel structure is formed through a pair of rear wheel wheels 120 and a single front wheel 110 that drives the mobile cart 100, and the front and rear wheels 110 are left and right by the driving direction adjusting handle 130. By rotating in the direction, there is an effect that can easily adjust the driving direction of the moving cart (100).

In addition, when the mobile cart 100 forms a three-wheeled structure, it moves during parking of the mobile cart 100 through a parking support 140 including a parking bolt 141, a compression bolt 142, and a parking nut 143. The bogie 100 does not easily fall, and has an effect that can be parked firmly.

The embodiments of the present invention described above and illustrated in the drawings should not be construed as limiting the technical spirit of the present invention. The scope of protection of the present invention is limited only by the matters described in the claims, and a person having ordinary knowledge in the technical field of the present invention can improve and modify the technical spirit of the present invention in various forms. Therefore, such improvements and modifications will fall within the protection scope of the present invention as long as it is apparent to those skilled in the art.

P: pipe
S: Strip electrode
100: mobile cart 110: front wheel
120: rear wheel 130: driving direction adjustment handle
140: parking support 141: parking bolt
142: compression bolt 143: parking nut
200: strip supply unit
300: upper and lower slide section
400: left and right slide
500: front and rear slide section
600: welding torch
700: flux supply unit 710: bracket

Claims (6)

A moving cart equipped with a front front wheel and a rear rear wheel to be rolled along the inner circumference of the pipe, and a strip supply unit installed at a rear upper portion of the moving cart and constantly supplying a strip electrode wound in a roll form. , An upper and lower slide unit coupled to the upper center of the moving cart to slide up and down, and a left and right slide unit coupled to the upper and lower slide sections to slide up and down together, and to slide left and right based on the upper and lower slide sections, and the It is coupled to the left and right slide parts and slides left and right together, the front and rear slide parts sliding back and forth based on the left and right slide parts, and the front and back slide parts, and receiving the strip electrodes from the strip supply part to receive arcs according to the application of power. Welding torch to arc welding by generating Includes a flux supply unit coupled to the left and right slide portion via a bracket to be located in the upper portion of the room, and supplies a flux to block the arc generated from the welding torch from external air,
The mobile cart,
The rear wheel wheel is provided with a pair of left and right, the front wheel is a three-wheel structure with one on the left,
A driving direction adjusting handle for rotating the front wheel in the left and right directions so that the driving direction can be adjusted left and right;
A parking support unit for contacting and supporting the floor surface during parking on the right side corresponding to the front wheel further includes
The parking support,
Parking bolts that move up and down according to left and right turns,
A pressing bolt for pressing and fixing the side surface of the parking bolt,
Automatic welding device for the pipe inner surface using a strip electrode, which is coupled to the lower end of the parking bolt and includes a parking nut spaced apart from or adjacent to the bottom surface according to the elevation of the parking bolt. delete delete delete delete delete

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