JP3592743B2 - Expander for circumferential welding - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to an expander device applied to circumferential welding of tank products.
[0002]
[Prior art]
Conventionally, a jig that protrudes from the inside of the tank to back up the circumferential weld line of the tank from the inside uses an integrated fixed expander with a large hydraulic cylinder as a projecting mechanism and a beam that holds the expander. ing.
Such an integrated fixed expander device is shown in FIGS. The integrated fixed expander shown in FIGS. 6 and 7 includes a back metal 12 in contact with a circumferential weld line of the tank, an air cylinder 13 for pre-extending the back metal 12, a hydraulic cylinder 15 for final extension, and a hydraulic cylinder 15. The arm 14 connects the air cylinder 13.
[0003]
The back metal 12, the air cylinder 13, and the arm 14 are divided, and the entire back metal 12 that has been pre-extended by each air cylinder 13 is extended by a hydraulic cylinder 15.
The holding beam 20 is of an extendable type that can change the beam length in accordance with the tank length, and holds the above-mentioned integral fixed expander at its tip so as to be separable. Since the amount of distortion of the holding beam 20 changes depending on the beam length, the holding beam 20 has a vertical adjustment screw 17 and an inclination adjustment screw 16 on an integrated fixed expander mounting surface to adjust the distortion.
In FIG. 7, reference numeral 18 denotes a separating device for separating the integrated fixed expander from the holding beam 20, and 19 denotes a clamper.
[0004]
As described above, the conventional integrated fixed expander requires the holding beam 20 that supports the back metal 12 until the back metal 12 is overhanged. At the same time, it is necessary to have a function of expanding and contracting the holding beam 20 according to the length of the tank, which complicates the structure. In addition, the cost is expensive.
On the other hand, if the length of the holding beam 20 is changed, the amount of deflection changes, and the center accuracy of the back metal 12 cannot be secured. In each case, the expander and the holding beam 20 after the centering adjustment and the back metal 12 overhang are cut off. Release work occurs.
[0005]
In addition, a hydraulic cylinder is required as a drive source for projecting the back metal 12 in the present apparatus, and oil may adhere to the inside of the tank due to oil leakage, which may cause fatal welding. In particular, oil leakage during welding has a great effect.
Furthermore, since the present apparatus is large and integrated, it requires a large area for storage.
[0006]
[Problems to be solved by the invention]
An object of the present invention is to provide an expander device for circumferential welding that does not require a large holding beam unlike a conventional expander device.
Another object of the present invention is to provide an expander device that does not require the use of a hydraulic cylinder for overhanging the back metal.
Still another object of the present invention is to provide an expander device that can be divided and stored in a compact state.
[0007]
[Means for Solving the Problems]
In the expander for circumferential welding according to the present invention, in order to solve the above problems, a plurality of guide supports attached to the inner surface of the tank in a ring shape along the circumferential weld line, a back metal that can be extended toward the inner surface of the tank, and A plurality of split-type backup rings having a two-stage air cylinder for extending the back metal, and the split-type backup ring is held by the tank during the extension of the back metal, but otherwise the guide is provided. A configuration having a clamp means for holding by a support is adopted.
[0008]
That is, the expander device for girth welding according to the present invention is provided with a guide support (split type) that is mounted in a ring shape on the inner surface of the tank, and the entire load of the backup ring is used until the back metal is overhanged. To receive. A mounting surface and a reference hole may be provided on the inner surface of the tank in order to mount the guide support on the inner surface of the tank.
[0009]
Further, in the device according to the present invention, the backup ring which receives the operation of the back metal and the reaction force is divided (sector-shaped), and has a detachable type which can be assembled and removed (disassembled).
Furthermore, a two-stage air cylinder is built in the backup ring, and the back metal is extended by the air cylinder.
[0010]
[Action]
The expander device for girth welding according to the present invention has the above-described configuration. By mounting the guide support in a ring shape in the tank, a surface (or mounting surface) for supporting the backup ring is formed, and the conventional holding beam There is no need to use a holding beam because it can be replaced instead.
[0011]
By attaching and connecting the backup ring on the surface of the guide support formed in a ring along the circumferential welding line on the inner surface of the tank in this way, the back metal can be set on the circumferential welding line of the tank, and A beam is formed on the ring that receives the reaction force generated when the back metal projects toward the inner surface of the tank.
Further, in the expander device according to the present invention, the back metal is extended by the operation of the two-stage air cylinder incorporated in the backup ring, so that there is no possibility that oil leaks to the inner surface of the tank.
[0012]
【Example】
Hereinafter, an expander device for girth welding according to the present invention will be specifically described based on one embodiment shown in FIGS.
1 and 2 show the overall arrangement of the girth welding expander according to the present embodiment. In FIG. 1, the connected split type expander is extended and held in a tank. FIG. 2 shows a state in which one block of the divided expander before the overhang is set in the tank.
[0013]
As shown in FIGS. 2 and 3, two reference holes of the rib 12 provided in the tank are sandwiched between the divided guide support 4 and the plate 3, and the positioning pin 5 is inserted and tightened.
The guide support 4 divided in the same manner is sequentially attached to the tank, and a ring of the guide support 4 positioned on the tank is formed.
The split-type backup ring 2 is sequentially assembled along a reference surface D of the ring of the guide support 4 by a clamp bolt 8 as a clamping means to form a backup ring.
[0014]
FIG. 4 shows an enlarged cross section of the split type backup ring. After the backup ring is formed, as shown in FIG. 4, the link operating rod 21 of the split type backup ring 2 and the cylinder rod 22 of the two-stage air cylinder 7 are joined by a one-touch operation by a coupler method. A two-stage cylinder 7 is sequentially attached to the reference surface E by a clamp bolt 8, and a drive source for extending the back metal 1 is formed.
[0015]
By connecting the backup ring 2 and two-stage air cylinder 7 can thus be subjected to reaction force generated when performing overhang of the back metal 1 by operating the cylinder with backup ring 2.
[0016]
As described above, the configuration in which the backup ring and the two-stage cylinder 7 are separated from each other makes the weight of the object light, and can be handled only by the operator's own manual work, and the crane and the hanging tool are not required.
[0017]
Next, the structure of the one-touch connection between the link operation rod 21 and the cylinder rod 22 by the coupler method will be described with reference to FIG.
FIG. 5 shows a mechanism for attaching and detaching the cylinder rod 22 and the link operating rod 21 by a one-touch joint fixed to the cylinder rod 22 of the two-stage air cylinder 7 with a nut 28, and the right half from the center line is in a connected state. , The left half shows the separated state.
[0018]
The one-touch joint is composed of a joint 23, a ring 24, a steel ball 25, a spring 26, and a guide 27. The guide 27 is a spring return type by a spring 26, and the ring 24 fitted in the groove of the joint 23 and the outer diameter step of the joint 23. The stroke is regulated by The steel ball 25 is guided by the tapered hole of the joint 23 and moves left and right, and is regulated by the inner diameter of the guide 27 and the outer diameter of the link operating rod 21.
[0019]
As shown in the state of the left half of FIG. 5, the steel ball 25 can be moved outward by pushing down the guide 27 by hand, and the link operating rod 21 is inserted along the inner diameter of the joint 23.
When the tip of the link operating rod 21 reaches the stepped portion of the inner diameter of the joint 23, the center of the outer diameter groove portion of the link operating rod 21 and the center of the steel ball 25 coincide with each other. When pushed up, the steel ball 25 moves inward and fits into the outer diameter groove of the link operating rod 21 to be in the state on the right in the figure, and the connection is completed.
[0020]
For separation, the steel ball 25 can be moved outward by depressing the guide 27 to increase the guide inner diameter, and when the link operating rod 21 is to be extracted, the steel ball 25 moves outward due to the tapered outer diameter groove portion of the link operating rod 21. It can be separated from the groove, and the link operation rod 21 is pulled out, and the separation is completed in the state shown in the left diagram.
[0021]
After assembling the two-stage air cylinder 7 to each divided backup ring 2 attached to the guide support 4 as described above and completing the assembly, the back metal 1 is moved by the first-stage cylinder of the two-stage air cylinder 7. Even if the clamp bolts 8 tightening the split-type backup ring 2 and the ring-shaped guide support 4 are loosened , each split-type backup ring 2 is in contact with the back metal 1 on the tank inner surface . It will be in the state of being held. And further operating the second stage of the air cylinder 7 in this state can the issue back metal 1 Zhang, can be received by the split backup ring 2 connected to the reaction force.
[0022]
FIG. 4 shows a cross section of the split type backup ring. When the two-stage air cylinder 7 is operated to the pull side, the link 9 is pulled, and the back metal 1 is guided by the guide pin 11 to invert the link 10 and is extended in the outer peripheral direction.
[0023]
As described above, the present invention has been specifically described based on the illustrated embodiments. However, the present invention is not limited to these embodiments, and various shapes and structures are included in the scope of the present invention described in the claims. It goes without saying that changes may be made.
For example, in the above embodiment, the driving force of the two-stage air cylinder 7 is transmitted to the back metal 1 by the link 9 and the link 10, but other various transmission mechanisms may be employed.
[0024]
【The invention's effect】
As specifically described above, in the expander device according to the present invention, the backup ring constituting the expander device is directly attached near the welding in the tank without using the holding beam, and the backup ring is placed on the circumferential welding line of the tank. The overhang has the following effects.
[0025]
(1) A large holding beam (with expansion and contraction and separation functions) becomes unnecessary.
[0026]
(2) The position can be reliably determined without centering adjustment of the center accuracy of the back metal contacting the welding line.
[0027]
(3) The overhang of the back metal can be performed by the air pressure applied to the two-stage air cylinder by the overhang link mechanism provided in the backup ring, so that no hydraulic pressure is required.
[0028]
(4) Since this device is of a detachable type with a detachable backup ring, the device can be divided and put into operation, and the storage area can be reduced.
As described above, according to the present invention, the structure of the entire device is simplified, and the manufacturing cost is low.
[Brief description of the drawings]
FIG. 1 is a plan view of an entire expander device according to an embodiment of the present invention.
FIG. 2 is a sectional view taken along the line AA in FIG. 1;
FIG. 3 is a plan view showing an attached state of a guide support 4 in FIG. 2;
FIG. 4 is a sectional view taken along the line BB in FIG. 2;
FIG. 5 is a sectional view showing a joint structure of a link operating rod and a cylinder rod of a two-stage air cylinder in the split-type backup ring shown in FIG. 4;
FIG. 6 is an overall side view of a conventional expander device.
FIG. 7 is a sectional view showing details of a portion C in FIG. 6;
[Explanation of symbols]
REFERENCE SIGNS LIST 1 back metal 2 split type backup ring 3 plate 4 guide support 5 positioning pin 7 two-stage air cylinder 8 clamp bolt 9 link 10 link 11 guide pin 21 link operating rod 22 cylinder rod 23 joint 24 ring 25 steel ball 26 spring 27 guide 28 nuts

Claims (1)

A plurality of guide supports including a plurality of guide supports mounted in a ring shape on the inner surface of the tank along a circumferential welding line, a back metal that can be extended toward the inner surface of the tank, and a two-stage air cylinder that extends the back metal. A split-type backup ring, and a clamp for holding the split-type backup ring in the tank while the back metal is being extended, but otherwise holding by the guide support. Expander device.

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