JPH0788690A - Positioning jig - Google Patents

Abstract

PURPOSE:To surely and instantly position an attaching position of a guide rail where a welding equipment to automatically weld circumferential joint part of a tube runs on it. CONSTITUTION:A positioning plate 5 is arranged on the outside of a tube to be machined, and a pressing part 3 is inserted inside the tube to be machined. The rear surface of a pressing plate 2 is pressed on the tube's end surface, an operating part 4 is turned and a main shaft 7 is advanced. When the main shaft 7 advances, an arm 9 turns while advancing, a trunnion 8, the arm 9 and a pressing shaft 11 operate as a toggle mechanism, a pressing head 12 is pressed on the tube's internal surface, and a positioning jig 1 is fixed at the tube's end part. The tube 31 is fixed by pressing a guide rail 32 at the top end surface of the positioning plate 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a guide rail positioning jig on which a welding device for automatically welding a circumferential joint portion of a pipe travels.

[0002]

2. Description of the Related Art When automatically welding a circumferential joint of a horizontally fixed pipe such as a gas main pipe with a welding device, as shown in FIG. 6, a fixed distance from the end of the fixed pipe 31 is used. Install the guide rail 32 at a remote position, and use the guide rail 3
Circumferential joint part 3 while traveling welding device 33 along 2
Welding 4 When welding the circumferential joint portion 34, it is necessary to cause the welding device 33 to travel accurately along the circumferential joint portion 34. For this reason, it is required that the guide rail 32 be accurately attached at a position separated from the end of the pipe 31 by a certain distance.

As a method for positioning the guide rail 32, conventionally, as shown in FIG.
Positioning is performed so that the distance from the end portion of 1 to the guide rail 32 is constant, or as shown in FIG. 8, the operator applies a gauge jig 42 to the end surface of the pipe 31 and the guide rail 32. While positioning, or using a pliers, etc. for the distance gauge, pipe 3
The guide rail 32 is positioned by fixing the guide rail 32 to position 1.

[0004]

As described above, the metal scale 41 is used.
When positioning the guide rail 32 while measuring the distance from the end of the pipe 31 to the guide rail 32 using, it is not possible to accurately measure the distance from the end of the pipe 31 to the guide rail 22. It was difficult. Also, the gauge jig 42
When positioning with a distance gauge or a distance gauge, it is necessary to apply a gauge jig or a distance gauge in parallel with the axis of the pipe 31, but the pipe 3
It was not easy to apply a gauge jig or a distance gauge parallel to the axial center of the pipe 31 over the entire circumference of 1. Therefore, whichever method is adopted, it is not easy to attach the guide rail 32 in parallel with the end surface of the pipe 31, and the guide rail 3
It was difficult to attach 2 with high accuracy.

Since the guide rail 32 is attached by measuring the distance from the end surface of the pipe 1 to the guide rail 32 over the entire circumference of the pipe 31, it takes a lot of time to attach the guide rail 32. However, there was a disadvantage that the work efficiency was poor.

The present invention has been made to solve the above disadvantages, and an object of the present invention is to provide a positioning jig capable of accurately positioning a mounting position of a guide rail in a short time.

[0007]

A positioning jig according to the present invention has a contact plate, a pressure part, an operating part and a positioning plate, and the contact plate is pressed against the pipe end surface for processing the rear surface. It defines the reference surface, the outer peripheral part is formed to project from the outer surface of the pipe, the pressurizing part is formed with an outer shape smaller than the inner diameter of the pipe to be processed, and the support fixed at a certain distance behind the center of the backing plate. A plate, a main shaft that is attached through the centers of the backing plate and the support plate and is biased rearward by a compression spring, and a trunnion that is attached to the rear end of the main shaft via the compression spring,
At least three arms, one end of which is rotatably attached to the trunnion and which rotates in the same plane as the axis of the main shaft;
A guide block is attached to the outer peripheral edge of the support plate at evenly divided positions so as to be orthogonal to the axis of the spindle, and the other end of the arm is rotatably attached. A pressure axis that moves in a direction orthogonal to the axis center of
A pressure head attached to the tip of each pressure shaft,
The operating portion is rotatably attached to the lever that is rotatably attached to the tip of the main shaft that projects to the front of the backing plate, and the lever that is rotatably attached to the tip of the bar of the lever and that abuts the front of the backing plate. −
The positioning plate has a predetermined length and is attached to at least three rear surfaces of the outer peripheral portion of the caul plate.

[0008]

According to the present invention, the positioning plate is arranged outside the pipe to be processed, and the pressurizing portion is inserted inside the pipe to be processed, and the rear surface of the contact plate is pressed against the pipe end surface to be processed. Determine the reference plane to be positioned by the plate.

In this state, the operating portion is rotated to move the main shaft forward. When the main shaft is advanced, a toggle mechanism is composed of the lever of the operating portion, a roller that is in contact with the contact plate, the main shaft, and a compression spring that urges the main shaft rearward, and the main shaft reaches the forward end. Stop at.

When the main shaft is moved forward, the arm rotatably mounted on the trunnion rotates while moving forward, and the pressurizing shaft rotatably mounted on one end of the arm moves along the guide block. It moves in a direction orthogonal to the axis, and these act as a toggle mechanism to press the pressure head against the inner surface of the pipe with a strong force. By the pressing force of the pressure head, the positioning jig is fixed to the tube end while the rear surface of the contact plate is pressed against the tube end surface to be processed. In this state, press the side surface of the guide rail against the tip surface of the positioning plate to guide the guide rail.
Fix the cable to the tube.

[0011]

1 and 2 show an embodiment of the present invention, FIG. 1 is a side sectional view, and FIG. 2 is a sectional view taken along the line A--A of FIG. As shown in the figure, the positioning jig 1 has a backing plate 2, a pressing portion 3, an operating portion 4 and a positioning plate 5. Patch 2
Defines the reference surface by pressing the rear surface against the pipe end surface, and the outer peripheral portion is formed to project from the outer surface of the pipe to be processed.

The pressure unit 3 has a support plate 6, a main shaft 7, a trunnion 8, at least three arms 9, a guide block 10, a pressure shaft 11 and a pressure head 12. The support plate 6 is formed to have an outer shape smaller than the inner diameter of the pipe to be processed, and is fixed to the rear portion of the center of the contact plate 2 by a column 13 having a constant length. The main shaft 7 has a mounting hole for the operation portion 4 at the tip end thereof, has a screw at the rear end portion thereof, is attached through the centers of the backing plate 2 and the support plate 6, and is urged rearward by the compression spring 14. ing.
The trunnion 8 is fixed to the rear end of the main shaft 7 by a compression spring 15, a spring receiver 16 and a nut 17, and one end of each arm 9 that rotates in the same plane as the axis of the main shaft 7 is rotatable. Support. The guide block 10 is attached to the outer peripheral end of the support plate 6 at three divided positions orthogonal to the axis of the main shaft 7. The pressurizing shaft 11 is rotatably attached to the other end of the arm 9 as shown in the sectional view taken along the line BB of FIG. Move in the direction you want to. The pressure head 12 is made of elastic hard rubber or synthetic resin and is attached to the tip of the pressure shaft 11. The main shaft 7, the trunnion 8, the arm 9 and the pressure shaft 11 constitute a toggle mechanism.

The operating section 4 includes a lever 18, an operating rod 19 and a roller.
La 20 and. The lever 18 is rotatably attached to the tip of the main shaft 7 protruding from the front surface of the backing plate 2, and an operating rod 19 is attached to one end of the lever 18 to form a long bar. The roller 20 is a lever 18 as shown in FIG.
Is rotatably attached to the front end of the short bar having a shorter length from the fulcrum shaft 21 and is in contact with the front surface of the contact plate 2.
The lever 18, the roller 20, the main shaft 7, and the compression spring 14 for biasing the main shaft rearward constitute a toggle mechanism.

The positioning plate 5 has a predetermined length and is attached to at least three rear surfaces of the outer peripheral portion of the pad plate 2.

When automatically welding the circumferential joint portion of the steel pipe to be welded using the positioning jig 1 constructed as described above by the welding device, the operation for positioning the guide rail for traveling the welding device is performed. explain.

First, as shown in the sectional view of FIG. 4, the positioning plate 5 is arranged outside the pipe 31 with the main shaft 7 retracted, and is inserted into the pipe 31 for processing the pressurizing portion 3. Then, the rear surface of the contact plate 2 is pressed against the end surface of the pipe 31 where the groove is provided. In this state, as shown in the sectional view of FIG. 5, the operating rod 19 of the operating portion 4 is rotated in the direction of the contact plate 2 as indicated by arrow C. When the operating rod 19 is rotated, the roller 20 attached to the tip of the bar of the lever 18 moves along the front surface of the contact plate 2, and the main shaft 7 biased rearward by the compression spring 14 advances. Let With the forward movement of the main shaft 7, the trunnion 8 fixed to the rear end portion of the main shaft 7 also moves forward, and the trunnion 8
The end of the arm 9 rotatably attached to the arm 9 is moved forward to rotate the arm 9 counterclockwise. The rotation of the arm 9 causes the pressure shaft 11 attached to the other end of the arm 9 to move to the pipe 3.
The pressurizing head 12 presses the inner surface of the pipe 31 in a direction orthogonal to the axial center of 1.

After the pressure head 12 presses the inner surface of the pipe 31, the operating rod 19 is further rotated in the direction of arrow C to move the main shaft 7 forward, and the pressure head 12 contacts the inner surface of the pipe 31 to apply pressure. Since the shaft 11 is stopped, the trunnion 8 is in the arm 9
As a result, the forward movement is suppressed, and the spring bearing 16 having the trunnion 8 attached to the main shaft 7 moves forward to compress the compression spring 15. The component force due to the compression force of the compression spring 15 operates on the pressure shaft 11 via the arm 9 and presses each pressure head 12 against the inner surface of the pipe 31 with a strong pressing force. 1 to tube 3
Fixed to 1. In this way, when the positioning jig 1 is fixed to the pipe 31, the contact plate 2 of the positioning jig 1 contacts the end portion of the pipe 31 and the pipe 3 is separated from the contact plate 2 by a predetermined distance.
Since the inner surface of 1 is suppressed by each pressure head 12, the positioning jig 1 can be reliably fixed to the end of the pipe 31.

When the operating rod 19 is further rotated and the roller 20 attached to the tip of the bar of the lever 18 reaches the axial center of the main shaft 7, the compression spring 14, which acts on the roller 20, 1
The component force of the rearward pulling force by 5 in the direction orthogonal to the axis of the main shaft 7 becomes zero, and the operating portion 4 can be stopped in this state. Therefore, the main shaft 7 can be held in the advanced state.

After fixing the positioning jig 1 to the pipe 31 in this manner, the guide rail 32 for running the welding device is pressed against the tip of the positioning plate 5 to position and fix it. When the guide rail 32 is positioned and fixed, the contact plate 2 is in contact with the welded end of the pipe 31 and serves as a reference surface, so that the position from the end of the pipe 31 can be accurately determined at three points. The guide rail 32 can be regulated easily and accurately.

After fixing the guide rail 32 to the pipe 31,
Rotate the operating rod 19 in the horizontal direction to retract the main shaft 7,
The engagement with the inner surface of the tube 31 by the pressure head 12 is released, and the positioning jig 1 is removed from the tube 31. After that, a pipe to be welded is arranged at the end of the pipe 31 to start the welding process.

[0021]

As described above, according to the present invention, the positioning plate for positioning the guide rail for traveling the welding device is arranged outside the pipe, and the pressurizing portion is inserted inside the pipe, and the backing plate is inserted. Since the rear surface is pressed against the pipe end surface to be machined and the reference surface for positioning is determined by the contact plate, the position of the guide rail can be accurately positioned.

Further, a toggle mechanism is constituted by an arm having one end attached to the rear end of the main shaft and a pressure shaft attached to the other end of the arm, and the operating portion is rotated to be inserted into the pipe. By moving the main shaft forward and operating the toggle mechanism, the pressure head attached to the pressure shaft can be pressed against the inner surface of the pipe with a strong force, and the positioning jig can be easily fixed to the pipe in a short time. be able to.

Further, when the positioning jig is fixed to the pipe, the pressing plate of the positioning jig contacts the end of the pipe, and the inner surface of the pipe is suppressed by each pressure head at a position separated from the contact plate by a predetermined distance. Therefore, the positioning jig can be securely fixed to the end of the pipe.

Further, when the main shaft is advanced to fix the positioning jig to the pipe end, the lever of the operating portion and the roller abutting against the contact plate, the main shaft and the main shaft are urged rearward. Since the toggle mechanism is constituted by the compression spring and the main shaft can be stopped at the forward end while the pressure head is pressed against the inner surface of the pipe, the guide rail can be easily positioned and attached.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG.

FIG. 4 is a side sectional view showing a tube inserting step of the above embodiment.

FIG. 5 is a side sectional view showing a tube fixing step of the above embodiment.

FIG. 6 is a side view showing automatic welding of pipes.

FIG. 7 is a side view showing a conventional example.

FIG. 8 is a side view showing another conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Positioning jig 2 Abutment plate 3 Pressurizing part 4 Operating part 5 Positioning plate 6 Support plate 7 Spindle 8 Trunnion 9 Arm 10 Guide block 11 Pressurizing shaft 12 Pressing head 14 Compression spring 15 Compression spring 16 Spring bearing 17 Nut 18 Lever 19 Operating Rod 20 Roller 31 Pipe 32 Guide Rail

Claims (1)

[Claims] 1. A backing plate, a pressure part, an operating part and a positioning plate, wherein the backing plate presses against a pipe end face for processing a rear surface to define a reference surface, and an outer peripheral part of the pipe outer surface. It is formed so as to project more, and the pressurizing part is formed with an outer diameter smaller than the inner diameter of the pipe to be processed, and penetrates the support plate fixed at a certain distance behind the center of the backing plate and the center of the backing plate and the backing plate. Attached to the main shaft biased rearward by the compression spring, the trunnion attached to the rear end of the main shaft via the compression spring, and one end rotatably attached to the main shaft of the main shaft. At least three arms that rotate in the same plane, a guide block that is attached to the outer peripheral edge of the support plate at evenly divided positions orthogonal to the axis of the main shaft, and other arms. The end is rotatably attached, and the main shaft runs along the guide block. It has a pressure axis that moves in the direction orthogonal to the axis and a pressure head that is attached to the tip of each pressure axis, and the operation part rotates to the tip of the spindle that protrudes to the front of the backing plate. A lever that is freely attached, and a lever that is rotatably attached to the tip of the bar of the lever and that abuts the front surface of the backing plate.
And a positioning plate having a predetermined length and attached to at least three rear surfaces of the outer periphery of the pad plate.