JPS5827039B2 - Support device for trolley for welding the inner peripheral surface of fixed pipes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a support device for a truck that runs to weld the butted inner peripheral surfaces of pipes, and in particular supports a welding truck so that it can travel over the entire inner peripheral surface, and also supports a welding truck in a welding field. These support devices are configured so that they can be used immediately as a mobile transport vehicle when moving a new product.

Butt welding of large-diameter, thick-walled pipes is generally performed with the pipes fixedly arranged, and various welding methods are used singly or in combination for automatic welding.

By the way, when these automatic welding devices are applied to a groove on the inner circumferential surface of a pipe, a welding head or a welding cart equipped with a sliding copper dowel and a traveling drive device together with the welding head is used.
In order to guide this welding cart, it is necessary to install a guide rail or a guide flock at a predetermined position.

However, when installing these, high precision is required to accurately position the welding head on the groove line.
Preparation time such as positioning takes up a lot of time during welding work, making it inefficient.

It has also been proposed to install these in a short time using a magnetic suction fixing jig, but this is not suitable for use with, for example, electrogas welding carts, as it lacks the strength to support the welding cart. .

Therefore, when applying a relatively heavy welding cart to the inner peripheral surface of the pipe, a stand is installed inside the pipe, and the welding cart is attached to the tip of the arm rod extending from the stand in the radial direction of the pipe, and the cart is placed inside the pipe. A mount system is adopted in which the robot is moved while being pressed against a surface, or the arm rod is actively driven to rotate.

However, in such a pedestal system, it is necessary to align the pivot axis of the arm rod with the tube axis, and installation of the pedestal often requires time and effort.

Further, it is desirable that the in-pipe welding device be capable of freely selecting upward, downward, upward, or decimal positions, and that the welding cart be able to pivot over the entire circumference.

Furthermore, it is desirable that these mounts be easily installed inside the pipe and set so that the pivot axis of the arm rod coincides with the pipe axis.Furthermore, when changing the welding location, these mounts can be easily installed. It is even more desirable if it can be moved.

The present invention has been made with attention to these points, and the above-mentioned frame is constructed so that it can be easily set up, and the welding cart can be driven to run over the entire circumference, and when changing the welding location, the welding cart can be moved by itself. The purpose is to provide a support device that can be used immediately as a transport vehicle.

However, such a support device is such that both sides of a rotating shaft member along the tube axis are supported freely by two-legged pillars, and a lever is attached to the substantially central part of the rotating shaft member in a direction perpendicular to the axis. A welded trolley is attached to the tip of the extended arm rod, and a pressure device is installed on the upper side of the pedestal to extend the pedestal via the support, and a pressure device is installed at the bottom of the pedestal to retract when the pedestal is extended. It consists of two pulleys.

The supporting device of the present invention will be explained in detail below based on the drawings, but the drawings show specific embodiments of the present invention, and the present invention is not limited to the illustrated examples. It is possible to implement the same method even if the design is changed or the design is changed.

Furthermore, the embodiments described in the claims do not limit the present invention.

FIG. 1 is a schematic sketch of the apparatus of the present invention, FIG. 2 is a side view, FIG. 3 is a front view on the right side of FIG. 2, and FIGS. 4 to 8 are partial configuration diagrams.

In these figures, the support device 3 of the present invention is set inside a butt weld of a fixedly provided pipe 1, and specifically, the supporting device 3 of the present invention is installed inside a butt weld of a fixedly provided pipe 1, and specifically, the support device 3 of the present invention is installed inside a butt weld of a fixedly provided pipe 1. A rotating shaft member 6 rotatably supported by each of the rotating shaft members 6, an arm rod 7 extending in the radial direction of the fixed tube 1 provided approximately in the center of the rotating shaft member 6, and an arm rod 7 extending in the radial direction of the fixed tube 1; It is comprised of pressurizing devices 9, 9 provided at the tops of columns 8, 8, respectively, which are attached to the tops of the pivot parts of the rotating shaft members.

The pillar 5.5 is provided to straddle the groove 2 on the inner surface of the abutting part, and supports the rotational axis of the rotating wheel member 6 along the axis of the fixed tube 1, while applying pressure at the top of the pillar 8. Equipment 9.9
By protruding the projecting members, the columns 8, 8 and the pillars 5, 5 are fixed in position so as to extend into the fixed tube.

Further, a welding cart 4 is attached to one end of the arm rod 7,
The welding cart 4 is held in pressure contact with the inner surface of the fixed tube by a resilient pressure member built into the arm rod 7, and is moved along the inner surface of the tube by active drive wheels provided on the welding cart 4.

By aligning the various welding torches provided on the welding cart 4 with the groove line 2, correct welding can be continued along the inner groove 2, and guidance over the entire inner peripheral surface is also possible.

In addition, when using a combination of various welding methods and means, it is possible to install many types of welding heads on the trolley 4 and use them alternately, or to replace them with appropriate heads each time. Once set, the entire surface of the inner groove can be welded as is.

10 is a balance weight that makes the welding cart 4 run smoothly.

The details of these configurations will be described below.

As shown in FIGS. 2 and 3, the pedestals 5.5 each consist of two substantially circumferential legs, so only one side thereof will be described.

That is, outer cylinders 12, 12 are fixedly installed through both ends of the base plate 11, and the outer cylinders 12, 12 are inclined at a certain angle with respect to the base plate 11, and their inner sides are connected by a wall plate 12b. do.

Although this angle of inclination can be selected appropriately, the embodiment shows an inclination angle of 15 degrees from each other.

While inserting the legs 13 into the outer cylinder 12,
The legs 13 are each configured to be anchored to the outer cylinder 12 at a predetermined position.

The legs 13 in the figure are each composed of jointed legs, and in particular, the legs of the outer cylinder insertion part are made of solid material, and the four mooring parts 13 are made of solid material.
a and is moored by a mooring port N2a formed on the outer cylinder 12, but these can be any other suitable mooring device, for example, by forming a dovetail groove in the insertion part of the leg 13. The present invention can be satisfied if the design can be changed freely, such as by inserting and removing the leg 13 by means of a screw ring provided on the outer cylinder 12 side, and if the leg 13 can be locked in a predetermined position while being held non-rotatably.

Reference numeral 14 denotes a leg end wire member, and a foot step 15 is attached to the tip thereof, and the foot step 15 is fixed to the connecting member 14 so that its protruding length can be adjusted.

Incidentally, side blocks 33 and 34 for pivotally supporting the rotation shaft member 6 are fixedly installed at the center of the top surface of the base plate 11, and the center of the rotation shaft member 6 freely supported by this block and the foot step 15 are fixedly provided. The distance from the tip is formed to match the radius of the fixed tube 1.

Therefore, the tip position of the foot step 15 of the leg 13 is set in advance according to the inner diameter of the fixed pipe to be welded, but the figure shows that this adjustment is performed by the mooring port N 2a, and fine adjustment is made by setting the foot step 15. However,
These can be freely changed and implemented as described above.

On the other hand, the rotating shaft member 6 is connected to the base plate 1 as shown in FIG.
Side block 33 fixed at the center of the top surface of 1 and 11
．． It is composed of shafts 31 and 32 that are loosely supported in cases 36 and 37 that are respectively fixed to the shafts 34 and arm rod support blocks 30 that are respectively fixed to opposite sides of the shafts 31 and 32.

And the support block 30 is a side block 33.34.
It is located at the center of the support block 30 and can rotate smoothly together with the shafts 31 and 32, allowing the arm rod 7 inserted into the support block 30 to freely rotate.

Further, a balance weight mounting bracket 35 is attached to one side 32, and the weight 10 is attached to the bracket 35.

The fixing of the bracket 35 and the structure of the weight 10 are as shown in FIG.

That is, in the figure, a protruding port NOa is formed on one side of the individual weights 10, and a screw hole 10b is formed on the opposite side so that the weights 10 are stacked on top of each other for attachment. Although the bolt of the weight 10 is shown passing through the screw hole of the bracket 35 and engaging with the recess formed in the shaft 32, these designs can be freely changed and implemented, and the weight lever can be fixed to the bracket 35. However, the position of the weight attached to the lever may be adjusted.

On the other hand, as shown in FIG. 8, the arm rod 7 provided on the support block 30 is provided so as to be non-rotatable and adjustable in and out.

That is, the arm rod 7 is composed of a cylindrical shaft, has a groove 38 formed on its top surface, engages with a key 38a fixed to the support block 30, and is slidably provided on the lower surface side of the block 30. It is configured to be anchored by a locking bolt 49 threaded onto the slide piece 48 and an engagement recess 45 formed in the cylindrical shaft 7.

The slide piece 48 is inserted into a dovetail groove formed on the lower surface side of the block 30, and is slid by a bundle screw 47 loosely supported on a projecting wall portion 46 formed on one side.

Therefore, by rotating the bundle screw 47, the arm rod 7 can be moved in and out of the support block 30 in accordance with the diameter of the fixed tube.

Further, the engagement recesses 45 are arranged in multiple rows, and the locking bolts 49
It can be moored by loosening it and tightening it into the appropriate engagement recess.

That is, the locking bolt 49 adjusts the movement of the cylinder shaft 7 into and out, and the bundle screw 4T allows for fine adjustment.

On the other hand, inside the cylindrical shaft 7 is a sliding shaft 39 that does not rotate but can slide freely.
is housed therein, and a screw hole is formed on one side (the left side in the drawing) of the sliding shaft 39.

A mounting bracket 43 of the welding cart 4 is provided in the screw hole.
A screw shaft 41 fixed to a clevis 42 that pivots is screwed onto the screw shaft 41, and a spring seat 44 is screwed onto the screw shaft 41 in advance.

Further, an enlarged-diameter stepped portion 7a is formed on one side of the cylindrical shaft 7, and a coil spring 40 is interposed in the stepped portion 7a to constantly urge the sliding shaft 39 to protrude. It is regulated by an adjustment handle 50 provided on the other side of the shaft 39.

That is, the protrusion pressure can be adjusted by adjusting the set position of the spring seat 44, and the cylindrical shaft 7 and the sliding shaft 3 can be adjusted by operating the handle 50.
The positional relationship with 9 can be adjusted.

When the clevis 42 protrudes while maintaining a predetermined pressure, a gap is formed between the handle 50 and the end surface of the cylinder shaft 7.

On the other hand, in order to hold the pedestal 5 and the rotating shaft member 6 constructed in this way on the inner surface of the fixed tube 1, the struts 8 fixed to the top surfaces of the side blocks 33 and 34 described above are utilized.

That is, as shown in FIG. 3, the column 8 is composed of an insertion column 24, a fitting column 25, and a support column 26, and the insertion column 24 and the fitting column 25 are elastically supported via a coil spring 29. The holding member 28 is attached to the insertion post 24.

Then, a pressurizing device 9 is attached to the top surface of the support column 26.

As the pressurizing device 9, any device can be used as long as it extends the top surface of the support column 26 and the inner surface of the fixed tube 1.
Although the figure shows an example of a push-up jack, other suitable screw-set push-up devices or piston push-up devices using an actuating cylinder can be freely selected and utilized.

Press down the column 8 by operating such pressurizing devices 9, 9 (
When the tube is stretched, the pillars 5, 5 are pressed against the inner surface of the tube, and hold the rotating shaft member 6 fixedly, and the rotating shaft member 6 is held in position along the tube axis.

Further, these holders are elastically supported by coil springs 29 provided on the pillars 8.

If the torch movement locus of the welding cart 4 attached to the tip of the arm rod 7 is made to coincide with the axis of the arm rod 7, the pedestal 5,
5, it may be installed in the center so as to straddle the groove 2.

In order to make these settings reliably and easily,
A gauge 16 is pivotally supported near the tip of one of the legs 13,
As shown in FIG. 3, it is preferable to align the groove 2 with the setting position of the pedestal by facing toward the head, and this gauge 16 is always elastically held along the pedestal 13.

Note that the welding cart 4 shown in FIGS. 2 and 3 is one in which two types of welding torches are installed together or can be replaced.
Reference numerals 51 and 52 indicate wires used for each welding means.

In the frame system configured in this manner, the arm rod 7 can be rotated over the entire circumference, and the entire circumference can be welded by one set.

On the other hand, the supporting device of the present invention is configured so that the pedestal device formed in this way can be easily moved on the inner surface of the tube, and this moving pulley simultaneously releases the trestle of the trestle pressurizing device and simultaneously moves the entire pedestal. It is constructed so that it can be pushed up to become a conveyance pulley.

That is, at the tips of the legs 13 of the pillars 5, 5, a lifting support device 17 is provided integrally with the connecting member 14, and the support device 17 slides on the cylindrical body 17a as shown in FIG. It is composed of a cylinder 19, and a pulley 18 is provided on the lower surface side of the sliding cylinder 19 via a bracket.

The cylindrical body 17a and the sliding tube 19 are provided so that the sliding tube 19 is always urged toward the protruding side by a coil spring 20.
Rotation of the sliding cylinder 19 is restricted by engaging a retaining bolt screwed onto the cylinder body 17a with a slit groove 19a formed in a part of its circumferential surface.

The protrusion pressure of the coil spring 20 is adjusted by a stop seat 21 screwed into the upper side of the cylinder 17a.
A support shaft 23 is formed integrally with the cradle member of the pulley 18 and is inserted through the center of a.

22 is a width plate attached to the top surface of the support shaft 23;
regulates the protrusion of

Therefore, the pulley 18 is allowed to protrude within the gap formed between the top surface of the stop seat 21 and the width plate 22.

The elastic force of this coil spring 20 is determined by the total force of the springs 20 (four pieces) provided on each leg, the pillars 5, 5, the rotation shaft member 6,
The strut member 8, the arm rod 7, the welding cart 4, etc. are configured to have a resilient force that pushes up the entirety thereof, and the strut 8
It is constructed so that the tensile force does not exceed the tension of the coil springs 29 (two pieces) provided in the.

Therefore, when pressing the pillars 5, 5 by tensioning the pressure devices 9, 9, as shown in FIG. 3, the pulley 18 of the support device 17
are press-fitted into the cylindrical body 17a, and the tips of the foot steps 15 of the legs 13 are pressed against the inner surface of the tube.

On the other hand, when the tension of the pressurizing devices 9, 9 is released, the coil spring 29 first restores its original state, and as the release continues, the group of coil springs 20 of the support device 17 pushes up the whole, and the fifth
As shown in the figure, the foot step 15 is retracted from the inner surface of the tube.

In this state, the group of pulleys 18 supports the entire assembly and can be easily transported to the next welding location.

Although a coil spring is shown here as an example, other suitable screw pushers, piston pushers using an actuating cylinder, etc. can be freely selected and used.

During transportation, the welding cart 4 is moved with the arm rods 7 in a vertical position so as to suspend it.

Although the pulley 18 is shown supported by the support device 17, the foot step 15 of the leg 13 is formed with a cylindrical shaft,
The present invention can be freely modified and implemented, such as by providing a pulley within the cylindrical shaft via a coil spring, or by forming the footstep 15 with two legs and disposing a pulley in the middle.

Further, the balance weight provided on the rotating shaft member 6 may be provided on the opposite side of the arm rod 7 from where the welding cart is attached, and a wire reel and a feeding device may be provided on these parts as auxiliary means for these balance weights. You can also do it.

Furthermore, if the welding cart attached to the tip of the arm rod 7 is configured to be able to rotate 180 degrees back and forth, the versatility will be extremely high, so as shown in FIG. The configuration is also adopted.

Instead of these reciprocating rotations, it is also possible to provide a spring-protruding sliding shaft at both ends of the arm rod 7, and a welding carriage on each of these, so that the welding is carried out alternately. A pressure gauge for measuring surface contact force can be provided on a part of the arm rod or on the opposite side.

A welding cart carrying torches for various welding means is attached to the supporting device constructed in this way, and inner circumferential surface welding is performed.

For example, MAG welding allows full circumference welding, but electrogas welding (elm gas welding) is recommended for highly efficient welding, and when performing a combination of MAG welding and elm gas welding, as shown in Figure 9. The A and B courses are MAG welded, and the C course is welded using elm gas welding to weld half the circumference on one side.

Next, MAG welding is performed on the other side using the D course, and after reversing, Elm gas welding is performed on the E course, and MAG welding is performed again on the F course.

Since the support device of the present invention is configured in this manner, (1) the welding cart can be run over the entire inner circumferential surface of the fixed pipe;

(2) The frame can be set extremely easily, and the center of the pivot arm can be aligned with the tube axis.

(3) By opening the tensioning and pressing device on the pedestal, it automatically becomes a transport vehicle and can be easily moved to the next welding site.

The internal surface welding of fixed pipe butt welds can be dramatically streamlined.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram explaining the support device of the present invention, Fig. 2 is a left side view of Fig. 1, Fig. 3 is a right side view of Fig. 2, and Fig. 4 is a partially enlarged view of Fig. 2. FIG. 5 is a diagram illustrating the operation of a part of FIG. 3, and FIG. 6 is a diagram illustrating the configuration of the rotating shaft member, with the main parts cut away. FIG. 7 is a plan view of FIG. 6, and FIG. 8 is a sectional view showing the structure of the arm rod, with main parts further broken away. FIG. 9 is an explanatory diagram showing an example of welding. 1...Fixed pipe, 2...Bevel, 3...
...Support device, 4...Welding cart, 5...
・・Pillar, 6・・Rotation shaft member, 7・・・・
Arm rod, 8... Support, 9... Pressure device,
10...Balance weight, 11...
Base plate, 12...Outer cylinder, 13...Legs, 1
4... Connection portion, 15... Foot step, 16... Gauge, 17... Support device, 18... Pulley, 19... ...Sliding tube,
20... Spring, 21... Stop seat, 22
...Breadboard, 23...Support shaft, 29...
... Spring, 30 ... Arm rod support block, 3
3.34...Side block, 39...
・Sliding shaft, 40...Spring, 43...Dolly mounting bracket, 44...Spring seat, 4
5... Engagement recess, 48... Slide piece, 50... Adjustment bundle.

Claims (1)

[Scope of Claims] 1. A support device for a welding wheel carrying a welding machine for welding the inner circumferential surface of the butt portion of fixed pipes, comprising pillars arranged on both sides across the groove, and these pillars. Consisting of a rotating shaft member whose both sides are pivotally supported and provided along the tube axis, and a rotating arm rod that is provided approximately in the center of the rotating shaft member and extends in a direction perpendicular to the shaft member. The swing arm is provided with a pressure member that urges the rotating shaft member toward the inner circumferential surface of the fixed pipe, so that the welding wheel attached to the tip of the swing arm is held in pressure contact with the inner circumferential surface of the fixed pipe. At the same time, a pressurizing device is provided on the upper side of the pedestal to extend and hold the pedestal in the pipe through the support, so that the pivot arm can be rotated around the entire circumference. A supporting device for a trolley for welding the inner peripheral surface of a fixed pipe, characterized by the following. 2. In claim 1, each pedestal is constituted by two legs, and a running pulley is provided at the tip of each leg, and the pulley protrudes and is biased by a spring. A support device for a dolly for welding the inner peripheral surface of a fixed pipe, which is constructed so that when the tension of the pressurizing device is released, the entire body is pushed up and becomes a moving pulley. 3. A support device for a carriage for welding the inner circumferential surface of a fixed pipe according to claim 1 or 2, wherein the tension pressurizing device is elastically attached via a spring provided in the support column. 4. In Claims 1, 2, or 3, the rotating shaft member is a fixed pipe inner circumferential surface welding trolley configured to have a balance weight attached to the side opposite to the protruding direction of the rotating arm rod. Support device. 5. The support device for a fixed tube inner circumferential surface welding trolley according to any one of claims 1 to 4, wherein the pressure member is configured to incorporate a coil spring. 6. In any one of claims 1 to 5, the pivoting arm rod attached to the pivoting shaft member is configured to be able to adjust its fixing position, and is a support for a carriage for welding the inner circumferential surface of a fixed pipe. Device. 7. A support device for a carriage for welding the inner circumferential surface of a fixed pipe according to any one of claims 1 to 6, wherein the welding wheel is capable of interchangeably mounting at least two types of welding torches. 8. A supporting device for a fixed tube inner circumferential surface welding cart according to any one of claims 1 to 7, wherein the pillar is provided with a tiltable gauge that defines the distance from the weld line. 9. In any one of claims 1 to 8, the welding wheel attached to the tip of the swinging arm is a welding wheel for welding the inner circumferential surface of a fixed pipe, which is provided so as to be able to rotate with respect to the shaft of the arm. Support device.