JP3199554B2 - Gouging torch posture setting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a posture setting device for determining the position and posture of a gouging torch with respect to a surface to be machined, and in particular, though not intended to be limited thereto, a groove for welding to a steel plate. Torque in an automatic gouging device that automatically drives a gouging torch along the steel sheet surface to form
H position setting device.

[0002]

2. Description of the Related Art For example, a cylindrical tank is formed by joining rectangular steel plates of a predetermined size into a ring shape, stacking a plurality of stages of the ring shape, forming a cylinder of a predetermined height, and attaching a top plate and a bottom plate. The joining of the rectangular steel plates is performed by welding. Japanese Utility Model Publication No. 59-35341 discloses a horizontal automatic welding machine for welding between upper and lower rectangular steel plates, that is, between adjacent rings. The gantry of this automatic welding machine has a substantially inverted L-shape when viewed from the side and a T-shape when viewed from the front. A curved, upright work material (a ring formed by joining steel plates) is provided on the top of the gantry. There are two wheels arranged side by side on the upper end, the left wheel is rotationally driven by an electric motor, and the right wheel is a driven wheel. In order to maintain a constant distance between the gantry and the vertical surface of the workpiece, there is a copying roller at the bottom of the gantry, which abuts on the vertical surface of the workpiece, and the welding roller is located above the copying roller. Ji is located.

[0003]

Prior to welding between the rings, a groove must be formed and placed at the horizontal seam between the rings. This groove is formed before stacking the rings or in a rectangular steel plate before the rings are formed, but after performing seam welding between the rings on one side (for example, the front side), the other side (the back side). If the method is carried out as it is, welding defects are likely to occur. For this reason, it is necessary to melt and blow off the first layer of the front welding by gouging (back filing).

[0004] Manual gouging using a gouging torch or a grinder requires a large amount of labor, generates large amounts of noise, fumes, and dusts, not only deteriorates the working environment, but also causes large unevenness in processing. Therefore, automatic gouging is desired. Automatic gouging can be performed by replacing the welding torch disclosed in Japanese Utility Model Publication No. 59-35341 with a plasma gouging torch, but a groove with a uniform and accurate position cannot be obtained immediately. In the case of welding, there is a groove, and the welding torch may be accurately positioned (groove tracing control) with respect to the groove. In the case of gouging, the joint between the rings on one surface (for example, the surface) side is required. The back seam that has become uneven by welding must be machined into a well-defined groove with a predetermined cross section, and it is important to set the position and posture of the gouging torch with respect to the ring connecting the rectangular steel plates.

SUMMARY OF THE INVENTION It is an object of the present invention to accurately and easily set or adjust the position and orientation of a gouging torch in gouging, for example, for forming a groove between the rings.

[0006]

SUMMARY OF THE INVENTION The present invention provides a gantry (1 to 5) for driving a gouging torch (59) along a surface to be machined.
4), a torch holder (58) for supporting the gouging torch on the gantry, and an angle adjusting mechanism (42, 42S, 484) for determining the inclination angle of the gouging torch with respect to the surface to be processed on the gantry.
9, 80) and a gouging torch attitude setting device (30) including a distance adjusting mechanism (33 to 35) for determining the distance of the gouging torch to the surface to be machined on the gantry, the front of the gouging torch (59). A tip portion (69t) located on the gouging target line, a separation portion (69r) extending in a direction away from the gouging target line continuously with the tip portion, and a side surface of the gouging torch (59) connected to the separation portion. Indicator member having a rear end portion (67, 64) extending to the rear of the torch along
(64-69); The index member is rotatably supported in the direction in which the distal end thereof is away from the gouging target line, and the index member is movable to the rear side of the torch at a rotational angle in which the distal end portion is away from the gouging target line. Indicator support means (61) for supporting the indicator member;
Evacuation locking means (63a, 65) for keeping the tip moved to the rear side of the torch and the tip thereof at a rotation angle away from the gouging aiming line; A reference tool (60) including a reference position locking means (63b, 65) for retaining at a rotation angle located in front and on the gouging target line. In addition, in the parentheses, in order to facilitate understanding, symbols attached to corresponding elements or corresponding items of the embodiment shown in the drawings and described later are shown for reference.

[0007]

The distance adjusting mechanism (33 to 35) determines the distance of the gouging torch (the position in the radial direction R from the center line of the cylindrical tank) to the surface to be processed; the angle adjusting mechanism (42, 42)
S, 48, 49, 80) determine the angle of inclination of the gouging torch (plasma incident angle, FIG. 6) with respect to the surface to be processed.

The reference position locking means (63b, 65) allows the reference tool (60)
In the state where the index members (64 to 69) are positioned such that the tip (69t) is on the gouging target line in front of the gouging torch (59), the processing position of the gouging torch (59) is (69t) or before or after (on the target line). Therefore, the worker looks at the tip (69t) and looks at the gouging torch (5
The processing position according to 9) can be easily and accurately recognized. Tip
(69t) and the relative position and orientation of the surface to be machined while referring to the distance adjustment mechanism (33-35) and angle adjustment mechanism (42, 42S,
48, 49, 80), the position and orientation of the gouging torch can be adjusted and set accurately and easily to a desired position and inclination angle.

The retracting and locking means (63a, 65) moves the index members (64-69) of the reference tool (60) to the position where they have been moved to the rear side of the torch, and the tip (69t) of the reference member (60t) aims at gouging. When positioning so that the rotation angle is away from the line, gouging
The index members (64 to 69) are located in front of the
Does not interfere with gouging of (59). Therefore, after adjusting and setting the position and posture of the gouging torch, the index members (64 to 69) may be retracted by the retracting locking means (63a, 65).

Other objects and features of the present invention will become apparent from the following description of embodiments with reference to the drawings.

[0011]

FIG. 1 shows an embodiment of the present invention in use during assembly of a cylindrical tank. This is because steel plate rings welded with rectangular steel plates are stacked in four stages, the front and back horizontal seam welding is completed up to the third stage, the horizontal seam welding of the front surface between the third and fourth stages is completed and the back surface ( This is the step of forming a groove (back filing) for horizontal seam welding of the inner surface by gouging. A plasma gouging power supply, a connection cable and a connection gas hose are placed outside the unfinished tank, and the connection cable is connected to the connection cable and one end of the connection gas hose is a cable of a stand hung on an upper end of the unfinished tank. It is supported by a flexible duct 5 and connected to a relay box (FIG. 3) on the mount. The connection cables include power lines, signal lines and water conduits, which are connected to the water treatment machine 9 (FIG. 3). In the following description, the height direction of the unfinished tank is the Z direction,
The radial direction is called an R direction, and the horizontal direction along the tank peripheral surface is called an S direction.

(1) Stand FIG. 2 shows the left side (front view from the center of the tank) of the stand hung on the upper end of the unfinished tank in FIG. 1, and FIG. 3 shows the back (view from the center of the tank). Front).
The gantry is a vertical upper frame 1, a base 2 which is integrated with the upper frame 1 and extends horizontally from the upper end of the upper frame 1 to the inside of the tank and outward.
It is composed of a joint bar-3 having an upper end fixed to a lower portion of the upper frame 1, and a lower frame 4 fixed to a lower end of the bar-3, and has a substantially inverted L-shape. The base 2 has a position adjustment mechanism in the R direction.
The wheels 11 and 13 are rotatably supported via (not shown), and rest on the upper end surface of the uppermost ring (a ring formed by welding a rectangular steel plate) of the unfinished tank. That is, the above-mentioned gantry is suspended from the uppermost ring of the unfinished tank through the wheels 11 and 13 inside the tank. Wheel 1
Reference numerals 1 and 13 are separated in the S direction, and a copying roller 16 (FIG. 2) is located at the apex of an isosceles triangle having the base line connecting the wheels 11 and 13 as a base.

(2) Wheel drive mechanism The output shaft of the AC motor 12 is connected to the axle of the wheel 11 extending in the R direction via a reduction gear mechanism.
The axle extending in the R direction of No. 3 has a reduction gear mechanism and a chain.
The output shaft of the AC motor 14 is connected via a coupling. The wheels 11 and 13 have the same structure and the same dimensions, the AC motors 12 and 14 have the same standard, and the reduction ratio between the wheel and the motor is also the same.

FIG. 13 shows a combination of wheels, a reduction gear mechanism, a chain coupling, an AC motor, and an inverter. The AC motors 12 and 14 are connected in parallel to the output terminals of one inverter 100 (commercial AC → DC → variable frequency AC) whose output frequency is variable. The output frequency of the inverter 100 is the same as the potentiometer 101
Can be adjusted. Since the power transmission system between the wheel and the motor has a chain coupling on only one side, the AC motor
When power is supplied to the motors 12 and 14 at the same time, the wheel 11 without the chain coupling starts to rotate first and follows it.
The wheels 13 via the chain coupling start to rotate. This is because the chain coupling has expansion and contraction corresponding to backlash and load.

Due to the presence of the chain coupling, an increase in the power supply load at the time of start-up is moderated, and a sudden increase in running acceleration (acceleration shock) is buffered. An AC motor 12 is connected to an output terminal of one AC power supply (inverter) 100.
14 are connected in parallel, the power distribution to the electric motor with a light load is reduced and the power to the electric motor with a high load is increased. For example, when one wheel slips, the rotational speed of the electric motor connected thereto increases, but since the motor is an AC motor, the increase in the speed is automatically suppressed to reduce power consumption, and the other motor slips. When the speed of the electric motor (high load) driving the non-wheel starts to decrease, the power consumption of the electric motor automatically increases so as to increase the speed. As described above, in this embodiment, the chain coupling is provided in the power transmission system of one wheel / motor combination to suppress the impact of the movement of the gantry, and each wheel is independently controlled by one AC motor. Driving and both motors are 1
Connected in parallel to two AC power supplies so that the rotational speeds of both wheels are automatically balanced to a constant speed corresponding to the output frequency of the AC power supply despite the respective load fluctuations. The starting is smooth, and the gantry moves in the S direction at a steady and constant speed. The moving speed of the gantry is set by a potentiometer 101.

(3) Copying Roller Supporting Structure FIG. 4 shows a structure for supporting the copying roller 16 on a gantry. A roller support structure 15 is fixed to the partitioning floor 6 of the lower frame 4. The copying roller 16 is rotatably supported by a support leg 17 (the rotation axis extends in the S direction). The support leg 17 is mounted on the protrusion 18 so as to be rotatable about a rotation axis extending in the R direction. The protrusion 18 is fixed to the tip of the inner screw rod 19. The inner threaded rod 19 passes through the guide sleeve 21. Guide sleeve 21
Is fixed to the frame 23, and the frame 23 is fixed to the partition floor 6. A groove 20 parallel to the direction (R) in which the rod 19 extends is formed on the outer peripheral surface of the inner screw rod 19, and the tip of the bolt 22 enters the groove 20. This bolt 2
2, the rotation of the inner threaded rod 19 is prevented, but the inner threaded rod 19 can advance and retreat in the direction R along the guide sleeve 21.

A screw rod 24 is screwed into the female screw hole of the inner screw rod 19, and a handle 25 is fixed to the screw rod 24. When the handle 25 is turned clockwise, the threaded rod 24 tries to enter deeply inside the inner threaded rod 19, but since the threaded rod 24 is restrained from moving in the R direction by the frame 23, the inner threaded rod is moved. 19 tries to retreat in the direction away from the steel plate (part of the fourth stage ring) W forming the tank wall (inside of the tank). However, since the copying roller 16 is pressed against the steel plate W by the rotational moment about the wheels 11 and 13 due to the gravity of the gantry (1 to 4), the copying roller 16 does not separate from the steel plate W. The gantry (1-4) is steel plate W
(Rotating around the wheels 11, 13). That is, the distance in the R direction between the lower frame 4 and the steel plate W is reduced. When the handle 25 is turned counterclockwise, the screw rod 24 projects the inner screw rod 19 toward the steel plate W, whereby the gantry (1 to 4) moves away from the steel plate W.
That is, the distance in the R direction between the lower frame 4 and the steel plate W becomes longer.

Referring to FIG. 2 again, a plasma gouging torch 59 (hereinafter simply referred to as a torch 59) is arranged below the copying roller 16. Referring also to FIG. 3, the bottom floor 7 of the lower frame 4
An abutment 31 is fixed to the abutment 31. The abutment 31 is provided with a mechanism for supporting the torch 59. 5 and 6
The mechanism for supporting the torch 59 is shown in FIG. (4) R-direction torch position adjusting mechanism Referring to FIGS.
2, a screw bar 33 extending in the R direction is rotatably connected to the R support frame 32, and two guide bars also extending in the R direction are provided on both sides of the screw bar 33. It is stuck to. A handle 34 is fixed to one end of the screw rod 33, and a lock lever 35 for locking the rotation of the screw rod 33 is connected to the R support frame 32. A slider fixed to the S support frame 36 is screwed to the screw rod 33, and the slider is
The two guide bars of the support frame 32 are movably guided in the extending direction thereof. When the lock lever 35 is rotated to the release position and the handle 34 (screw rod 33) is turned clockwise, the S support frame 36 moves in the direction R away from the steel plate W and turns counterclockwise. And the S support frame 36
Moves toward the steel plate W in the R direction. When the lock lever 35 is rotationally driven to the lock position, the handle 34 is rotated.
The (screw rod 33) cannot be turned by a considerably strong force.

(5) S-direction torch position adjusting mechanism Referring to FIGS. 5 and 6, a screw rod 37 extending in the S direction is rotatably connected to the S support frame 36, and also extends in the S direction. The guide bars 39 and 40 of the book are threaded rods 3
7 are fixed to the S support frame 36 on both sides. A handle 38 is fixed to one end of the screw rod 37, and a lock lever 41 for locking the rotation of the screw rod 37 is connected to the S support frame 36. A slider fixed to the S moving plate 80 is screwed to the screw rod 37, and the slider is connected to the two guide bars -3 of the S support frame 36.
At 9, 40, they are movably guided in their extending direction. When the lock lever 41 is rotated to the release position and the handle 38 (screw rod 37) is turned clockwise, the S moving plate 80 is moved rightward in FIG. The moving plate 80 moves leftward in FIG. When the lock lever 41 is rotationally driven to the lock position, the handle 38 is rotated.
The (screw rod 37) cannot be turned by a considerably strong force.

(6) Plasma Incident Angle Adjusting Mechanism Referring to FIGS. 5 and 6, lock levers 48 and 49 are provided on the S moving plate 80 via the bottom plate 42S of the Z direction torch position adjusting mechanism. Lock lever 48, 49
The bottom plate 42S can be easily turned by pivoting to the release position, and the angle with respect to the vertical surface of the steel plate W (the plasma incident angle with respect to the vertical surface of the steel plate W) can be adjusted. When the lock levers 48 and 49 are rotationally driven to the lock position,
The Z support frame 42 cannot be turned by a considerably strong force.

(7) Z-direction torch position adjusting mechanism Referring to FIGS. 5 and 6, a screw rod 43 extending in the Z direction is rotatably connected to the Z support frame 42, and also extends in the Z direction. The guide bar-46, 47 of the book is the screw rod 4.
3 and is fixed to the Z support frame 42. A handle 44 is fixed to one end of the screw rod 43, and a lock lever 45 for restraining the rotation of the screw rod 43 is connected to the Z support frame 42. A slider fixed to the support arm 50 is screwed to the screw rod 43, and the slider is connected to the two guide bars-4 of the Z support frame 42.
At 6, 47, they are movably guided in the direction in which they extend. When the lock lever 45 is rotationally driven to the release position and the handle 44 (screw bar 43) is turned clockwise, the support arm 50 moves upward, and when the handle 44 is turned counterclockwise, the support arm 50 is turned. The arm 50 moves downward. When the lock lever 45 is rotationally driven to the lock position, the handle 44 (screw rod 4
3) cannot be turned with a very strong force.

(8) Automatic Advancing / Retracting Mechanism Referring to FIG.
Are fixed, and an automatic advance / retreat mechanism is incorporated in the frame 51. That is, the frame 51 has a screw rod extending in the longitudinal direction (and parallel to the plane of FIG. 6) and guide bars on both sides of the screw rod.
The rotating shaft of the table 54 is connected. A slider fixed to the advance / retreat plate 52 is screwed to the screw rod. Electric motor
When the motor 54 rotates forward, the reciprocating plate 52 moves in the direction approaching the steel plate W along the frame 51, and when the electric motor 54 rotates in the reverse direction, the reciprocating plate 52 moves in a direction away from the steel plate W along the frame 51. Moving. If the plasma arc voltage between the steel plate W and the torch 59 deviates above the set range, the electric motor is stopped.
The forward / backward drive circuit drives the motor 54 to rotate forward, stops the energization of the electric motor 54 in the set range, and reversely drives the electric motor 54 when the plasma arc voltage falls below the set range. (Not shown), and the electric current is supplied to the electric motor 54 for the above-described forward rotation and reverse rotation by this circuit.

(9) Mechanism for Adjusting Groove Cross Section Shape Referring to FIG. 6, a rotary plate 56 is in surface contact with the reciprocating plate 52. A torch holder 58 is fixed to the rotating plate 56, and a plasma gouging torch is attached to the torch holder 58.
Chi 59 is fixed. A shielding plate 70 is also fixed to the rotating plate 56. FIG. 7 shows a plan view of the welding torch 59 viewed from the direction indicated by the arrow A7 shown in FIG.

Referring to FIG. 7, a pin 55 set on the reciprocating plate 52 passes through the rotating plate 56, and the rotating plate 56 can rotate about the pin 55. 1 centered on pin 55
Four arc-shaped through holes along the two circles are formed in the rotating plate 56, and bolts 57 (four in total) pass through these holes and are screwed into the advance / retreat plate 52. By loosening the bolt 57, the rotating plate 56 can be rotated about the pin 55. This rotation corresponds to the center axis of the pin 55 (FIG. 6).
For adjusting the rotation angle of the torch 59 about the horizontal axis (parallel to the arrow A7 shown in FIG. 7), that is, the torch 59 with respect to the horizontal
(The inclination angle with respect to the groove center line, FIG. 10).

If this angle is set to zero (the torch 59 is horizontal) (the position shown by the solid line in FIG. 10), the groove cross-sectional shape obtained by gouging of the torch 59 by plasma arc is shown in FIG. As shown in FIG. 11 (a), it is substantially vertically symmetric in the Z direction. When the bolt 57 is loosened and the torch 59 is turned downward so that the torch 59 is directed downward (indicated by a two-dot chain line in FIG. 10) and the bolt 57 is tightened, the plasma arc of the torch 59 is reduced. As shown in FIG. 11 (b), the groove cross-sectional shape obtained by gouging with a groove has a steep slope at the lower groove hypotenuse and a gentle slope at the upper groove hypotenuse. Also, the bolt 57 is loosened and the torch 59 is turned upward (FIG. 1).
(A posture indicated by a one-dot chain line at 0).
When the bolt 57 is tightened by rotating the groove, the groove cross-sectional shape obtained by gouging of the torch 59 by the plasma arc is such that the lower groove hypotenuse is slightly inclined as shown in FIG. As a result, the upper groove hypotenuse becomes a steeply inclined re-shaped cross section. Thus, by adjusting the rotation angle of the rotation plate 56, the groove cross-sectional shape can be adjusted and selectively set.

(10) Reference Tool for Torch Position Setting Although not shown in FIG. 6, the gouging target position of the torch 59 is provided on the rotating plate 56 to which the torch holder 58 is fixed. A reference tool 60 for indicating is fixed. FIG. 8 is an enlarged view of the external appearance of the reference tool 60, and FIG. A plunger 64 is inserted into the cylinder trunk 61, and a small-diameter rod 67 is fixed to the distal end of the plunger 64, and the rod 67 penetrates the distal end surface of the cylinder trunk 61, and the torch 59 faces the plasma injection port. Extends to. The rear end of the plunger 64 is pressed by a compression coil spring 66, so that a force is applied to the plunger 64 to move the plunger 64 toward the plasma injection port. A connecting tool 68 is fixed to the tip of the rod 67, and the rear end of a small-diameter index rod 69 bent at 90 degrees at two places is fixed to the connecting tool 68. As shown in FIG. 7, the index rod 69 has a tip portion 69t located on a center line (a gouging target line) passing through the plasma injection port of the gouging torch 59, and is continuous with the tip portion 69t and has a center at the gouging target line. A separating portion 69r extending in a radial direction (direction away from the torch center), and a rear end portion 69b continuous with the separating portion 69r and extending to the toe tail end side in parallel with the aiming line of the gowning. And
The end of the rear end portion 69b is fixed to the connecting tool 68.

A U-shaped opening 62 is formed on the peripheral surface of the cylinder trunk 61.
The plunger 64 is opened through the opening 62.
A knob 65 fixed to the projection protrudes outward from the tube trunk 61. In the opening 62, the cylinder stem 6 for locking the plunger 64 by placing the index rod 69 at the reference position (FIG. 7).
One branch opening 63a and 63b extending in the circumferential direction are continuous. FIG. 9 shows an enlarged view of the cylinder trunk 61 with the opening 62 facing the front.

FIGS. 7, 8 and 9 show an indicator rod 69.
In the reference position, that is, the state in which the tip 69t is placed on the gouging aiming line of the torch 59.
In this state, the knob 65 has rotated to the end of the branch opening 63b and is engaged with the branch opening 63b. The direction pointed by the tip 69t of the index rod 69 is the gouging target direction.
By the time the plasma arc is generated on the torch 59 for gouging, the knob 65 is first rotated from the rotated position shown in FIGS. 7 to 9 by about 120 degrees along the branch opening 63b. As a result, the knob 65 reaches the opening main portion of the opening 62 extending in the direction in which the rod 67 extends, and the index rod 69
7 deviates from the gouging target line of the torch 59, and comes off to the right of the shielding plate 70 in FIG. Next, the knob 65 is pushed down to the branch opening 63a against the repulsive force of the compression coil spring 66 here. As a result, the tip portion 69t of the index rod 69 is lowered to the position of the small diameter portion near the torch holder 58, which is located closer to the large diameter portion of the torch 59, and the spring 66 is compressed. Next, here is 65
Is rotated along the branch opening 63a to its end. As a result, the knob 65 engages with the branch opening 63a. In this state, the tip portion 69t of the index rod 69 is located substantially above the small diameter portion of the torch 59 near the torch holder 58. This is the retracted position of the index rod 69. In this state,
The index rod 69 does not interfere with the gouging of the steel sheet by the torch 59 at all.

When the torch 59 is set in the gouging position with respect to the seam position of the uppermost ring of the unfinished tank and the ring thereunder, the knob 65 engaged with the branch opening 63a (the retracted position). Is turned along the branch opening 63a.
Then, when the knob 65 comes off the branch opening 63a, the plunger 64 is pushed by the repulsive force of the compression coil spring 66, and the rods 67 and 69 fly forward. So picker 6
When the knob 5 is turned along the branch opening 63 to its end, the knob 65 and the rods 67 and 69 are at the reference positions shown in FIGS. In this state, the operator can clearly recognize the position and direction of the gouging target of the torch 59 with respect to the steel plate W by looking at the tip portion 69t. Adjustment of position and posture for accurate gouging,
Easy setting.

(11) Setting of the position and posture of the torch The manner of use of the lateral gouging device described above by an operator will now be described. When the gantry is mounted on the unfinished tank as shown in FIGS.
The distance between the lower frame 4 and the steel plate W is adjusted by adjusting the projecting position of the rubber 16. This is done by turning the handle 25 (FIG. 4). Then, the position and posture of the torch 59 are adjusted as follows.

A. Initial position setting of the automatic advance / retreat mechanism: By operating a switch or the like on the operation panel surface of the automatic advance / retreat mechanism (52 to 54) of the operation panel 10, the advance / retreat plate 52 is set at the center position of the advance / retreat range.

B. Setting of the index rod 69: the reference tool 60
The knob 65 (retreat position) engaged with the branch opening 63a of FIG. 7 is turned along the branch opening 63a. This causes the rods 67 and 69 to fly forward. Then, the knob 65 is turned to the end along the branch opening 63b. Thus, the knob 65 and the rods 67 and 69 are at the reference positions shown in FIGS. In the following adjustment, the operator adjusts the torch position and posture while paying attention to the position and the direction (direction) of the tip portion 69t of the index rod 69.

C. Setting of groove cross section: Lock lever
48, 49 to the release position, and arm 50
6 around the counterclockwise direction in FIG. As a result, the torch 59 is in a posture facing the plane of the steel sheet W at substantially right angles. Next, the bolts 57 (four bolts; FIG. 7) are loosened and the rotating plate 56 is turned clockwise or counterclockwise (FIG. 1).
0). That is, the angle of the torch 59 with respect to the horizontal plane is adjusted. When the adjustment is completed, the bolt 57 is tightened. Then, the arm 50 is turned around the screw rod 43 by about 90 degrees clockwise in FIG. 6 (return to the position shown in FIG. 6), and the lock levers 48 and 49 are turned to the locking position.

D. R-direction torch position adjustment: Lock lever
Turn 35 to the release position and turn handle 34. When it is turned clockwise, the torch 59 approaches the steel plate W in the R direction,
When it is turned counterclockwise, it separates from the steel plate W. When the adjustment is completed, the lock lever 35 is turned to the locked position.

E. S-direction torch position adjustment: Lock lever
Turn 41 to the release position and turn handle 38. When turned clockwise, the torch 59 moves rightward in FIG. 6 and when turned counterclockwise, it moves leftward. When the adjustment is completed, the lock lever 41 is turned to the locked position.

F. Adjustment of the torch angle with respect to the plane (correctly curved surface) of the steel plate W: turn the lock levers 48, 49 to the release position, and turn the arm 50 clockwise or counterclockwise around the screw rod 43. I forgot. When the adjustment is completed, the lock levers 48 and 49 are turned to the locked position.

G. Torch height adjustment: Lock lever 45
Is turned to the release position, and the handle 44 is turned. When turned in a clockwise direction, the torch 59 rises in the Z direction, and when turned in a counterclockwise direction, it descends. When the adjustment is completed, the lock lever 45 is turned to the locked position.

The adjustment of C to D need not be limited to the order described above. Even if one adjustment is made, one adjustment may be performed, such as making another adjustment and then making another adjustment again. There is no need to limit. As described above, the tip end of the tip portion 69t of the index rod 69 is brought into contact with the start of the groove processing at the upper and lower seam position of the steel sheet W, and the posture of the tip end of the index rod 69 (the gouging aiming line of the torch 59). ) Is set as desired. When this is completed, the knob 65 is lowered to the branch opening 63a and engaged therewith. Thereby, the index rod 69
Of the torch 59 near the torch holder 58 (retracted position).

(12) Automatic gouging When an operator operates a switch or the like on the gouging operation panel of the operation panel 10 to set a gouging bias condition and presses a start button, a controller using a controller built in the operation panel 10 operates. −
By the cans control, Ar of the plasma gas is supplied to the plasma gouging torch 59, and after the preflow, the high frequency and no-load voltage are applied to the torch 5 for ignition of the pilot arc.
9 is applied between the tip electrodes at the tip, and a pilot arc is generated. At the same time, the automatic advance / retreat mechanism operates to advance the torch, and when the pilot arc approaches the workpiece (W), the main arc trigger power is turned on and the torch 59 is turned on.
High-temperature plasma is ejected from the tip of.

When the plasma arc (main plasma) is started, the controller turns on the inverter 100 to start rotating the wheels 11 and 13.
A start (control start) is instructed to a controller for controlling the energization of the electric motor 54 of the automatic advance / retreat mechanism (52 to 54). The rotation speed of the wheels 11, 13 is determined in accordance with the resistance value set in the potentiometer 101 of the inverter 100, and the gantry (1-4) is not completed at a constant speed (1-2 m / min). It moves along the inner circumference of the tank. During this constant-speed movement, the torch 59 continuously injects high-temperature plasma, and the controller of the automatic advance / retreat mechanism controls the rotating plate 56 (the torch above it) so that the plasma arc voltage is constant. H) is driven to protrude or retract (FIG. 12 (a)). In this way, plasma gouging is automatically performed at the horizontal seam between the fourth stage ring and the third stage ring.
The adjustment of D to G can also be performed during this gouging step.

In the embodiment described above, the distance of the gouging torch (the position in the radial direction R from the center line of the cylindrical tank) to the plane or curved surface of the material to be processed is adjusted by the distance adjusting mechanism (33 to 35). Set; height adjustment mechanism (43
45), the position (height) of the gouging torch in the hanging direction (vertical direction Z) is determined;
2,42S, 48,49,80) determines the angle of inclination of the gouging torch (plasma incidence angle, FIG. 6) with respect to the flat or curved surface of the workpiece; the first angle adjustment mechanism (55-57)
Thus, the inclination angle of the gouging torch with respect to the horizontal plane (the inclination angle with respect to the groove center line, FIG. 10) is determined, that is, the groove cross-sectional shape (FIG. 11) is determined. That is, using these mechanisms, the distance (FIG. 6), the height (FIG. 2), the inclination angle (plasma incident angle, FIG. 6), and the groove cross-sectional shape (FIG.
11) can be adjusted and set.

The forward / backward drive mechanism (52-54) drives the first mechanism (55-57) forward / backward in the direction (A8) along the processing direction line of the gouging torch. That is, the controller of the forward / backward drive mechanism monitors the plasma arc voltage between the workpiece (W) and the plasma gouging torch 59, and increases the voltage so as to maintain this voltage at a constant value. Sometimes, the first mechanism (55-5) is driven by the forward / backward drive mechanism (52-54).
7), and retract when it drops. In other words, when there is unevenness on the flat surface or curved surface of the workpiece (W), when it is concave, the advance / retreat driving mechanism (52 to 54) projects the first mechanism (55 to 57) (projection of the torch), and Sometimes it is evacuated (torch is evacuated). As a result, a groove with a constant depth is formed following the irregularities on the surface of the material to be processed.

It is assumed that the gouging torch 59 is driven forward and backward by the forward and backward driving mechanisms (52 to 54), and the forward and backward driving mechanisms (52 to 54) are angle-adjusted by the first mechanism in order to adjust the inclination angle of the torch. When the torch 59 is driven forward and backward, the torch 59 moves, for example, as shown in FIG. 12B, so that the groove bottom position shifts in the vertical direction (Z). A shift occurs. However, in the above-described embodiment, the first mechanism (55-57) is driven forward / backward by the forward / backward drive mechanism (52-54), and the inclination angle of the gouging torch 59 with respect to the horizontal plane (FIG. 10). ) Is set, and when the first mechanism (55-57) is driven forward and backward, the torch 5
9 moves, for example, as shown in FIG. 12A, and the groove bottom position DWd does not substantially shift in the vertical direction (Z).

In the above-described gouging apparatus, gouging debris falls during the gouging process.
Is located above the torch 59, no gouging debris adheres to the copying roller 16, and no gouging debris adheres to the steel plate surface against which the copying roller 16 abuts. The profile of the steel plate surface of the la 16, that is, the profile of the lower frame 4 with respect to the steel plate surface is accurate.

Further, the above-mentioned gouging device is provided with a chain coupling in the power transmission system of one of the wheels / motors to suppress the impact of the movement of the gantry, and to control each wheel by one.
Independently driven by two AC motors, and both motors are connected in parallel to one AC power supply, so that the rotational speeds of both wheels automatically correspond to the output frequency of the AC power supply despite the respective load fluctuations. Since the balance is automatically balanced to a constant speed, the gantry is started smoothly, and the gantry moves in the S direction at a steady constant speed.

Further, in the above embodiment, since the reference tool 60 is provided integrally with the plasma gouging torch 59, the torch is provided.
It is easy to adjust and set the position and orientation of the hook 59 with respect to the workpiece (W). The index rod 69 is set to the reference position by turning the knob 65 engaged with the branch opening 63a to remove the index rod 69 from the branch opening 63a.
And is locked to the branch opening 63b. To return the index rod 69 from the reference position to the retracted position, turn the knob 65 engaged with the branch opening 63b to remove it from the branch opening 63b, and then push it down to the branch opening 63a, and A thread that turns to the end and engages with the branch opening 63a
Realized by action. Thus, the pulling out and storing of the index rod 69 is extremely simple.

[0047]

With the reference position locking means (63b, 65), the reference tool (6
In the state where the index member (64-69) of (0) is positioned such that the tip end (69t) is on the gouging aiming line in front of the gouging torch (59) (FIG. 7), the gouging torch (59) Is located at the front end (69t) or before and after (on the target line). Therefore, the operator can easily and accurately recognize the processing position by the gouging torch (59) by looking at the tip (69t). Using the distance adjustment mechanism (33-35) and the angle adjustment mechanism (42, 42S, 48, 49, 80) while referring to the relative position and orientation between the tip (69t) and the surface to be machined, accurate and easy The position and orientation of the gouging torch can be adjusted and set to desired positions and inclination angles.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the appearance of a horizontal automatic gouging apparatus equipped with one embodiment of the present invention.

FIG. 2 is an enlarged side view of the gouging device shown in FIG. 1 as viewed from a wheel 11 side.

FIG. 3 is an enlarged front view of the back of the gouging device shown in FIG. 1 as viewed from the inside of an unfinished tank.

FIG. 4 is an enlarged vertical sectional view of a support structure of the copying roller 16 shown in FIG.

5 is an enlarged vertical sectional view of a support structure of the plasma gouging torch 59 shown in FIG.

6 is a plan view showing an outline of an embodiment of the present invention, and is a plan view of the torch support structure shown in FIG.

7 is an enlarged plan view showing the torch 59 shown in FIG. 6 as viewed from the direction of arrow A7.

FIG. 8 is an enlarged perspective view showing the appearance of the reference tool 60 shown in FIG.

9 is an enlarged plan view of a cylinder trunk 61 shown in FIG.

FIG. 10 is an enlarged plan view showing the torch 59 shown in FIG. 6 as viewed from the direction of arrow A7.

11 is an enlarged cross-sectional view of a gouging end portion of the steel sheet W shown in FIG. 2, where (a) is a groove cross section obtained when gouging with the torch 59 in a position shown by a solid line in FIG. 10 (b) shows a groove cross section obtained when the torch 59 is gouged with the posture shown by the two-dot chain line in FIG. 10, and FIG. 10 (c) shows the torch 59 with one point in FIG. Fig. 3 shows a groove cross section obtained when gouging is performed in a position shown by a chain line.

FIG. 12 (a) is a perspective view of the advance / retreat mechanism frame 51 shown in FIG.
It is a side view which shows the chih 59 in a simplified form, and shows the state in which the torch 59 is protruded by the advance / retreat mechanism by a two-dot chain line.
(B) shows a case where the frame 51 is rotated without the torch rotation on the frame 51 by the pin 55, and the bottom position shift of the groove when the torch 59 is protruded by the advance / retreat mechanism. DW
d.

FIG. 13 shows wheels 11, 13 and an AC motor 1 shown in FIG.
It is an enlarged plan view which shows the mechanical connection of 2,14.

[Explanation of symbols]

1: Upper frame 2: Base
3: Joint bar 4: Lower frame 5: Cable duct
6: Interior partition 7: Bottom floor 8: Bogie control panel
9: Water treatment machine 10: Operation panel 11, 13: Wheel 1
2, 14: AC motor 15: Roller support structure 16: Copying roller 1
7: Support leg 18: Projection stand 19: Internal screw rod 2
0: groove 21: guide sleeve 22: bolt 2
3: Frame body 24: Screw bar 25: Handle 30: Torch support structure 31: Abutment 3
2: R support frame 33: Screw rod 34: Handle 3
5: Lock lever 36: S support frame 37: Screw rod 3
8: Handle 39, 40: Guide bar 41: Lock lever 4
2: Z support frame 43: Screw bar 44: Handle 4
5: Lock lever 46, 47: Guide bar 48: Lock lever 4
9: Lock lever 50: Support arm 51: Retraction mechanism frame 5
2: Advance / retreat plate 53: Reduction mechanism 54: Electric motor 5
5: Pin 56: Rotating plate 57: Bolt 5
8: Torch holder 59: Plasma gouging torch 6
0: Reference tool 61: Tube trunk 62: Opening 63
a, 63b: branch opening 64: plunger 65: knob 6
6: Compression coil spring 67: Rod 68: Connector 6
9: Index rod 69t: Tip 69r: Isolation part 69
b: rear end portion 70: shielding plate 80: S moving plate 10
0: Inverter 101: Potentiometer

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kenji Okuyama 7-6-1, Higashi Narashino, Narashino City, Chiba Prefecture Nippon Steel Welding Industry Co., Ltd. Equipment Division (56) References JP-A-5-305437 (JP, A) JP-A-63-60075 (JP, A) JP-A-59-229281 (JP, A) JP-A-47-18752 (JP, A) JP-A-3-47655 (JP, U) JP-A-5 -70771 (JP, U) Shokai Sho 59-30373 (JP, U) Shoko 52-918 (JP, Y2) (58) Fields investigated (Int. Cl. ⁷ , DB name) B23K 10/00 B23K 9/00 B23K 9/12

Claims (3)

(57) [Claims] 1. A gantry for driving a gouging torch along a surface to be machined, a torch holder for supporting the gouging torch on the gantry, and an angle defining an inclination angle of the gouging torch with respect to the surface to be machined on the gantry. Gouging to the surface to be machined on the adjustment mechanism and the gantry
A gouging torch attitude setting device including a distance adjusting mechanism for determining a distance between the front end of the gouging torch and a separation portion extending in a direction away from the gouging target line continuously with the front end. An index member having a portion and a rear end portion which is continuous with the separated portion and extends rearward along the side surface of the gouging torch; the index member is rotatable in a direction in which the tip end portion is away from the gouging target line; Index support means for supporting the index member and movably supporting the index member at the rear end of the torch at a rotation angle away from the gouging aiming line; the position where the index member has been moved to the rear side of the torch and the front end thereof Evacuation locking means for keeping the portion at a rotation angle away from the gouging aiming line; and the indexing member, the tip of which is in front of the torch, and which has a gouging aiming line. A reference tool including a reference position locking means for retaining the rotation angle at an upper position. 2. The gouging torch attitude setting device according to claim 1, wherein the reference tool further includes a spring means for pushing the index member in a direction in which the gouging aiming line extends. 3. The indicator supporting means is a cylindrical member having an opening extending in a direction in which the gouging aiming line extends and a branch opening continuous at both ends thereof; the indicator member has a rear end portion extending from the front end of the cylindrical member. A knob that enters the interior and projects from the interior through the opening to the outside; the spring means is within the tubular member and pushes the index member; and the retraction locking means is provided with one of the branch openings. 3. The gouging torch attitude setting device according to claim 2, wherein the reference position locking means is a combination of the other of the branch openings and the knob.