JPH0747491A - Automatic jig device for welding groove alignment of cylindrical tank - Google Patents

Abstract

PURPOSE:To save labour for a welding groove aligning work of each cylinder of a tank barrel in a steel tank manufacturing process by using the automatic jig device constituted by combining a full face radiation multi-axis jack 1 and an auxiliary equipment, and to execute its work in a short time and safely. CONSTITUTION:A jack 1 of a full face radiation multi-axis type is connected to a motor-driven hydraulic pump 2 by one piece of piping unit 3. To the tip of a hydraulic jack unit 11, a jig plate unit 5 is attached through a spacer 14. They are mounted on a lifter of a moving type which can adjust a vertical position. The left side cylinder 7 and the right side cylinder 8 to be subjected to groove alignment are placed naturally on a free bearing 13 attached to a common work stand 12. An equipment mounted on the lifter 6 can be moved and set simply as one body with the lifter 6 to the inside AA of the groove alignment face of the left side cylinder 7 and the right side cylinder 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus used in a process of manufacturing cylindrical tanks such as a pre-process for welding and joining cylinders, that is, a welding groove aligning work. A plurality of cylinders formed by bending a steel plate have irregularities in roundness even if the circumferences are the same. In the circumferential joint surface between the cylinders, it is necessary to correct the circularity of the left and right cylinders to be the same.
The present invention relates to a device that enables mechanization and automation of this work, achieves labor saving, improvement of groove alignment accuracy, improvement of work safety, and improvement of appearance quality of a welded portion of a tank.

[0002]

2. Description of the Related Art Generally, when a steel plate of a certain length is processed into a cylindrical shape by using a roller bending machine, the circularity of each cylinder is slightly different even if the circumference is the same. The actual situation is different. When these cylinders are welded to each other to manufacture a cylindrical tank, the portion of the circumferential welding line is the work before the main welding work, while correcting the distortion in the radial direction,
The grooves of the end faces of adjacent cylinders must be flush with each other. Normally, this work, so-called "weld edge alignment",
Conventionally, it has been performed manually or manually by using props.

As an example of the conventional method, FIG. 3, FIG. 4 and FIG.
Shown in. 3 and 4, the tip of the L-shaped hand-pushing lever 9 is temporarily welded to the left-side cylinder 7 at the radial misalignment between the left-hand cylinder 7 and the right-hand cylinder 8.
By pushing down, the end of the right side cylinder 8 is pushed down, the groove surfaces of both cylinders are aligned with each other, and they are tack welded together. Next, the temporary welding bead at the tip of the L-shaped hand pushing lever 9 is cut, and the same work is repeated again on the circumferential groove alignment line using the L-shaped pushing lever again.

In FIG. 5, a set of hand-operated hydraulic jacks 10 is put inside a cylinder and a jig plate unit 5 is attached to the tip thereof. The jig plate unit 5 is pressed against the misaligned portion of the left side cylinder 7 and the right side cylinder 8 in the weld groove surface by the manual hydraulic jack 10 to correct the distortion and align the groove. In this method, temporary tack welding work is performed by rotating the manually-operated hydraulic jack 10 in a cylinder by manpower and sequentially correcting misaligned portions of the circumference. Therefore, this is a work that requires a lot of labor and time.

[0005]

In the prior art methods, both the person who handles the L-type hand pushing lever 9 and the hand pushing hydraulic jack 10 and the person who tack-welds each must perform manual work at the same time. Moreover, it takes a lot of time and effort to push the lever or move the jack. If the temporary welding bead at the tip of the L-shaped hand pushing lever 9 is incomplete during the groove alignment work, there is a risk that it may come off and pinch a finger between the cylinder and the lever. Further, the groove alignment work of the large diameter cylinder is a high place work, and the labor is increased.

The method of FIG. 3 seems to be simple, but since the tip temporary welding bead of the L-type hand pushing lever 9 remains on the surface of the cylinder side, no trace remains after the groove alignment work is completed. It is necessary to work smoothly with a grinder. The method of FIG. 5 has the complexity of temporary tack welding while rotating and manually moving the manually pushed hydraulic jack.

It is an object of the present invention to solve the above drawbacks and to make great improvements in labor, safety, time reduction and product quality.

[0008]

In order to achieve the above object, in the welding groove alignment automatic jig device for a cylindrical tank according to the present invention, a plurality of radial arrangements are provided as shown in FIGS. 1 and 2. The center of force of the jack is located in the same plane, and the surface-radiating multiaxial jack 1 is characterized in that it expands and contracts in the radial direction with the same stroke and pushes with the same force. Set inside the groove alignment part,
An arc-shaped jig plate unit 5 having a cylindrical inner surface curvature is attached to the tip end thereof via a spacer 4. An electric hydraulic pump 2 connects a single piping unit 3 to the central portion of the flush radial multi-axis jack 1.

The flush radial multi-axis jack 1 is mounted on a lifter 6 having a table 20 which can be easily moved up and down by a foot hydraulic jack 19. The lifter 6 adjusts the vertical position of the flush radial multi-axis jack 1 and horizontally moves it.

The left-side cylinder 7 and the right-side cylinder 8 to be weld-groove aligned are first placed on the common work table 12, and the welding-groove alignment automatic jig device for the cylindrical tank is placed inside the cylinders. Put it in and get it working. Common work table 12
Is a component for aligning the straightness of the axial centers of the cylinders in the longitudinal direction.

[0011]

The left side cylinder 7 and the right side cylinder 8 are operated as a pre-process for operating the groove alignment automatic jig device constructed as described above.
On the common work table 12. As shown in FIGS. 1 and 8, a plurality of free bearings 13 are built in the common work table 12 in parallel with each other in two rows, and the two cylinders are in a two-point contact circle support system by the free bearings 13. Therefore, the longitudinal center lines of both cylinders are naturally held in a straight line.

The hydraulic fluid from the electric hydraulic pump 2 is supplied to the pipe unit connecting hole 27 in the central portion of the flush radial multiaxial jack 1 via the pipe unit 3 as shown in FIG. The liquid is radially separated into the respective hydraulic jack units 11, and the liquid is pressurized.

When pressed, the jig plate unit 5 mounted via the spacer 4 installed at the tip of the hydraulic jack unit 11 has a constant width including the groove alignment line AA of the left cylinder 7 and the right cylinder 8. Width (width of jig plate unit 5)
It is pressed against the inner surface of the to correct the radial misalignment of the groove alignment line and ensure the roundness.

Since the hydraulic jack units 11 are arranged so as to face each other, the pressing force when the liquid is pressurized and the reaction force from the cylinder are canceled out, and the main body of the flush radial multiaxial jack 1 is rotationally displaced. You can rest still in the original center without any problem.

[0015]

EXAMPLES Examples will be described with reference to the drawings.
FIG. 1 shows an assembled front view of an eight-axis device in an example of the present invention. FIG. 2 is a side view thereof. The left side cylinder 7 and the right side cylinder 8 which are to be groove-aligned are free bearings 13 assembled in a common work table 12 in two parallel rows at equal pitches.
Placed on top of. The groove alignment surface AA is abutted in the same plane. 1 and 2 show that the working hydraulic load is applied to the flush radial multi-axis jack 1 so that the jig plate unit 5 corrects the radial distortion of the left cylinder 7 and the right cylinder 8 within the groove alignment surface AA. , Shows the state where the circularity of the groove alignment surface AA is maintained.

The spacer 4 shown in FIGS. 1 and 2 has an excessively large cylindrical diameter to be machined, so that the hydraulic jack unit 11 is used.
Is a steel pipe component that is used by being mounted in the middle of the jig plate unit 5 and the flush radial multi-axis jack 1 when the extension stroke is insufficient. In order to maintain the parallelism of the jig plate units 5 in the AA plane, they are connected to each other by the tension coil springs 18. That is, when the flush radiating multiaxial jack 1 is stretched, a tensile force is generated between the tension coil springs 18 so that the jig plate unit 5 is oriented parallel in the AA plane. These jig plate units 5 are ginkgo-shaped for the purpose of evenly distributing the pressing force.

FIG. 6 is an assembled front view of the flush radial multi-axis jack 1. FIG. 7 shows an enlarged cross section of the B part. In this drawing, the flush radial multi-axis jack 1 comprises a hydraulic jack unit 11 and a hydraulic distribution unit 14. As shown in FIGS. 1 and 2, a spacer 4 is installed at the tip of each of these hydraulic jack units 11, and a jig plate unit 5 is attached to the tip thereof.

The hydraulic jack unit 11 is radially assembled in a support boss 15 in the hydraulic distribution unit 14 by a screwing method as shown in FIGS. The central portion of the hydraulic distribution unit 14 is provided at the hydraulic distribution block 1
6, a liquid feed path 17 is radially formed toward the center of the hydraulic jack unit 11. One hydraulic piping unit 3 is connected to the central portion of the side surface of the hydraulic distribution block 16 by a screwing method.

Liquid can be sent from the electric hydraulic pump 2 to the piping unit 3 at a pressure of 700 kg / cm ² at maximum. This electric hydraulic pump 3 is of automatic pressure holding type and has a hydraulic pressure of 100.
Any hydraulic pressure can be selectively set within a range of up to 700 kg / cm ² .

As shown in FIG. 1, the flush radial multi-axis jack 1 and the electric hydraulic pump 2 are mounted on a lifter 6 with wheels, which facilitates the carrying-in setting work for the left and right cylinders of these devices. I am doing it. The foot hydraulic jack 19 built in the lifter 6 allows the table 20 of the lifter 6 to be moved.
The height of can be freely adjusted up and down according to the diameter of the cylinder. In other words, the foot hydraulic jack 19 can be used to set the center of the flush radial polyaxial jack 1 to the center position of the groove aligning surface AA before applying the operating hydraulic pressure load.

[0021]

Since the present invention is constructed as described above, it has the following effects.

By using a flush radial multi-axis jack,
The groove alignment work of the left side cylinder 7 and the right side cylinder 8 can be simultaneously performed on the entire circumference, and the work time can be shortened.

Left cylinder 7 and right cylinder 8 to be groove aligned
Unlike the conventional method, there is no need for temporary welding work for temporarily installing the jig tool on the surface of the, so it is not necessary to perform the grinder work for removing the temporary welding bead, so the surface has a repair mark. Absent. Therefore, the aesthetic quality of the product is improved.

As in the conventional case, the L-shaped push lever 9 of the jig tool is used.
The work of pushing and the work of finishing the grinder to remove the temporary welding bead are unnecessary, and the injuries of fingers and the like can be prevented, so the work safety is improved. Since it is a hydraulic work, even if a high-pressure liquid leaks, there is no danger that it will be scattered around like a gas leak.

Since the electric hydraulic pump 2 is used, labor can be saved. Since the arcuate curvature of the jig plate unit 5 is accurately laser-cut according to the cylindrical curvature, the alignment accuracy of the groove alignment surface is improved.

[Brief description of drawings]

FIG. 1 is an overall assembly front view showing an embodiment of a welding groove alignment automatic jig device for a cylindrical tank.

FIG. 2 is a side view of the entire assembly of the embodiment shown in FIG.

FIG. 3 is an overall assembly diagram of an example using an L-shaped push lever 9 of a conventional device.

FIG. 4 is an enlarged view of a usage state of the L-type hand push lever 9 used in the conventional device as shown in FIG.

FIG. 5 is an overall assembly view of another example of a conventional device using a hand-push hydraulic jack 10.

FIG. 6 is an assembly diagram of a flush radial multiaxial jack 1 used in the present invention.

7 is an enlarged sectional view of a B part in FIG.

FIG. 8 is an enlarged assembly view of the common work table 12 used in the present invention.

[Explanation of symbols]

 1 1-sided radial multi-axis jack 2 Electric hydraulic pump 3 Piping unit 4 Spacer 5 Jig plate unit 6 Lifter 7 Left side cylinder 8 Right side cylinder 9 L-type hand push lever 10 Hand pushing hydraulic jack 11 Hydraulic jack unit 12 Common work table 13 Free bearing 14 Hydraulic distribution unit 15 Support boss 16 Hydraulic distribution block 17 Liquid feed path 18 Tension coil spring 19 Foot hydraulic jack 20 Table 21 High pressure packing 22 Cylinder tube 23 Piston rod 24 Self return spring 25 Piston packing 26 Tip cap 27 Piping unit splice hole

Claims (1)

[Claims] 1. A jig plate attached to an electric hydraulic pump 2 via a piping unit 3 via a flush-radial multi-axial jack 1 and a spacer 4 installed at the tip of the flush-radial multi-axial jack 1. An automatic jig device for welding groove alignment of a cylindrical tank, which comprises a unit 5 and a lifter 6 equipped with the above equipment.