JP6537881B2 - Circumferential welding equipment - Google Patents

Description

  The present invention relates to a circumferential welding device for circumferentially welding, for example, the outer periphery of a circular member and the peripheral portion of a circular hole of a plate material into which the circular member is inserted.

  For example, in a heat exchanger, a heat exchange chamber is formed by supporting the outer periphery of a large number of liquid flow pipes (pipe members, circular members) for circulating a liquid for heat exchange, and the large number of pipes. Welding is performed circumferentially with the peripheral portion of the circular hole of the tube support plate (tube plate).

  Patent Document 1 discloses a tube end automatic welding apparatus (circumferential welding apparatus) used for such a purpose. This device comprises an air cylinder drive centering jig inserted into the tube member, a motor drive rotary body rotatably supported coaxially with the centering jig, and supported by the rotary body. A welding torch is provided, and with the centering jig inserted and fixed in the pipe member (centering opening), welding of the circumferential portion is performed by the welding torch by rotating the rotating body. The centering jig has an advancing and retracting axis, and an expansion / contraction sleeve that expands and contracts in diameter by advancing and retracting the advancing and retracting axis in the axial direction, and the insertion and removal to the tube member by driving the advancing and retracting axis by an air cylinder device. Sometimes the expansion sleeve is reduced in diameter, and after insertion the diameter of the expansion sleeve is increased and fixed to the tube member.

Patent No. 3280235 gazette

  In the automatic tube end welding device (circumferential welding device) disclosed in Patent Document 1, the end of the piston rod for operating the advancing / retracting axis of the centering jig penetrates the rotating body in the axial direction and protrudes from the rotating body The air cylinder device coupled to the piston rod was supported by the portion so as to allow relative rotation with respect to the rotating body. For this reason, there existed a problem that axial direction length became large especially. In addition, there has been a restriction on the installation position of the wire feeding device or wire reel for supplying the welding wire to the welding torch.

  The present invention is to provide a circumferential welding apparatus capable of shortening the axial length without the end portion of the piston rod opposite to the centering jig passing through the rotating body based on the above problem awareness. With the goal. Another object of the present invention is to obtain a circumferential welding device with less restriction on the installation position of the wire feeding device or the wire reel.

A circumferential welding apparatus according to the present invention comprises: a housing; a rotating body rotatably supported and rotatably driven by the housing; a welding torch supported by the rotating body; and an advancing / retracting shaft located at an axial center of the rotating body A centering jig extending from the rotating body, and a piston rod for advancing and retracting the advancing and retreating axis of the centering jig. an air cylinder device having; have a, the air cylinder device, the circumferential welding device provided on the rotating body so as to rotate together with the rotating member, the air cylinder device, the rotary body integrally And a piston having the above-described piston rod axially slidably fitted in a piston chamber of the rotating cylinder, the piston being adapted to rotate integrally with the rotating cylinder Characterized in that it is coupled.

  The piston rod may be formed of a hollow piston pipe, and the piston pipe may be formed with a plurality of radial through holes for introducing signal lines or power lines in the piston pipe.

  In one embodiment, the rotating cylinder is in direct sliding contact with the housing, and a ring-like air passage is formed in a sliding contact surface of the housing with the rotating cylinder, and the rotating cylinder is provided with the rotating cylinder. Regardless of the rotational position of the piston, an air flow passage is formed in communication with the ring-shaped air passage to lead compressed air to the piston chamber.

  The piston rod of the air cylinder device and the advancing / retracting shaft of the centering jig can be separate members, and can always be separated from each other.

  The rotating body and the centering jig may be coupled to be relatively rotatable or may be coupled to be relatively non-rotatable.

  According to the circumferential welding device of the present invention, the air cylinder device having the piston rod for operating the advancing and retracting axes of the centering jig is provided on the rotating body so as to rotate together with the rotating body having the welding torch. The piston rod does not penetrate the rotating body. Therefore, the axial length of the device can be shortened. In addition, since the piston rod does not penetrate the rotating body, the installation position of the wire feeding device and the wire reel is freed, and the device configuration can be diversified.

It is a partial section front view showing one embodiment which applied a circumference welding device by the present invention to a tube end automatic welding device. FIG. It is a partial expanded sectional view of FIG. FIG. 2 is an enlarged partial cross-sectional view of a centering jig portion of the automatic tube end welding device of FIG. 1;

  The present embodiment relates to an automatic welding apparatus (circumferential welding apparatus) 100 for welding the outer periphery of the pipe member P to the inner peripheral edge of the pipe support hole H of the pipe support plate W, as shown in FIGS. It is an embodiment to which the invention is applied. The automatic pipe end welding apparatus 100 has a main housing 11 and a manifold (sub-housing) 13 coupled to the right end of the main housing 11 in FIGS. 1 and 3 via a coupling pin 12. Inside the main housing 11, a rotating body 20 rotated by a motor 14 (FIG. 1) is rotatably supported via a bearing 16 (FIG. 1, FIG. 3). The rotation of the motor 14 is transmitted to the rotating body 20 via a known reduction gear train (not shown) including a worm wheel mechanism. The main housing 11 and the manifold 13 (bearing 16) described above are fixed side members.

  A rotating cylinder 21 is rotatably supported by a bearing 16 coaxially in the cylindrical manifold 13. The rotary cylinder 21 integrally connects the rotating body 20 to the left end of FIGS. 1 and 3 with a fixing bolt 20b (FIG. 3), and integrally connects the cylinder cover 22 to the right end. A piston chamber 23 coaxial with the rotating cylinder 21 is formed between the rotating cylinder 21 and the cylinder cover 22, and the piston 24 is slidably fitted in the piston chamber 23. An axially parallel pin 25 is fixed to the rotating cylinder 21 at an eccentric position, and the axially parallel pin 25 is slidably fitted in an axially parallel hole 24 a formed in the piston 24. That is, the piston 24 is movable in the axial direction with respect to the rotating cylinder 21, and the rotating cylinder 21 (the rotating body 20) and the piston 24 always rotate integrally.

  A ring spacer 27 is airtightly held and fixed (fixed) between an inner flange 13 a formed in the manifold 13 and the cylinder cover 22 so as to be sandwiched between a pair of packings 26. The ring spacer 27 has a ring-shaped passage (air passage) 27 a facing the outer periphery of the rotating cylinder 21. A hose connection port 13b for supplying compressed air to the ring-shaped passage 27a of the ring spacer 27 is fixed to the manifold 13, and a pipe line 17 connected to the hose connection port 13b has a control valve V and a regulator. It is connected to a compressed air source C via R.

  On the other hand, in the rotating cylinder 21, regardless of the rotational position of the rotating cylinder 21, a radial passage (air passage) 21a communicating with the ring passage 27a of the ring spacer 27 and an axial parallel passage (air passage) 21b are formed. The cylinder cover 22 is formed with a communication passage 22a for connecting the axially parallel passage 21b and the piston chamber 23. The compressed air from the compressed air source C is introduced into the piston chamber 23 through these passages. FIG. 3 shows a state where the compressed air from the compressed air source C is introduced into the piston chamber 23 and the piston 24 is moved leftward against the force of the compression spring 28. When the introduction of the compressed air into the piston chamber 23 is stopped, the piston 24 moves to the right by the force of the compression spring 28.

  A piston pipe (piston rod) 30 is fixed to the piston 24 via a fixing screw 29 at its axial center. The piston pipe 30 extends into the rotary body 20 through an axial hole 21 c (and a slide bearing 21 d) formed in the rotary cylinder 21. The axial length adjustment bolt 31 is screwed into the end portion of the piston pipe 30, and after adjusting the screwing position of the axial length adjustment bolt 31, tightening the lock nut 31a adjusts the effective length of the piston pipe 30. It is fixed to the rear length. The piston pipe 30 is hollow, and a plurality of through holes 30 a for inserting signal lines or power lines in the piston pipe 30 are formed at different positions in the longitudinal direction.

  A rotary cylinder (rotary body) 20P is fixed to the rotary body 20 at the left projecting position in the drawing from the main housing 11, and the piston pipe 30 extends into the rotary cylinder 20P (FIG. 4). , See Figure 1).

  A centering jig 40 is supported coaxially rotatably on the rotary cylinder 20P via a bearing 32 so as to be relatively rotatable. The centering jig 40 movably inserts and supports an advancing and retracting shaft 42 on a shaft portion of a support cylinder 41 whose proximal end is supported by a bearing 32. A tapered surface 43a is provided at the tip of the advancing and retracting shaft 42. The movable side cone 43 is fixed by a mounting screw 44. Further, between the rear end portion 42a of the advancing and retracting shaft 42 and the support cylinder 41, a compression spring 45 for moving and urging the advancing and retracting shaft 42 in the retracting direction (rightward in FIG. 4) is interposed.

  A stationary cone 46 having a tapered surface 46 a is fixed to the outer periphery of the support cylinder 41. Between the fixed side cone 46 and the movable side cone 43, the outer diameter of the taper cone of the both ends is elastically made by a plurality of slits 47a formed along the generatrix direction from both ends of the tube A variable tubular sleeve 47 is supported. The compression spring 45 exerts a force in the direction of drawing the advancing and retracting shaft 42 into the support cylinder 41 to narrow the distance between the movable side cone 43 and the fixed side cone 46. Therefore, the taper cones at both ends of the expansion and contraction sleeve 47 are tapered Due to the action of the surfaces 43a and 46a, the diameter of the sleeve is normally enlarged against the elastic pressure of the sleeve itself (with no external force applied to the advancing and retracting shaft 42).

  The welding torch 50 is fixed to the rotary cylinder 20P via the bracket 51, and the wire feeding and fixing is fixed to the rotary cylinder 21 (the cylinder cover 22) by positioning it on the right outside of the main housing 11 in FIG. A wire feeding device 54 for feeding the welding wire 53 to the welding torch 50 and a wire reel 55 for holding the welding wire 53 are supported via the plate 52. The wire feeding device 54 feeds out the welding wire 53 held by the wire reel 55 by a motor driving force, and a wire insertion hole 56 (FIG. 3) formed in the wire feeding fixing plate 52, the cylinder cover 22 and the rotating cylinder 21. And it is made to pass through the inside of rotary body 20, and is supplied to guide tube 50G of welding torch 50, and is widely used for this kind of tube end automatic welding device. Since the rotating cylinder 20P and the rotating cylinder 21 rotate integrally, the welding torch 50, the wire feeding device 54, and the wire reel 55 supported by these also rotate integrally. Therefore, there is no possibility that the welding wire 53 (and the conduit tube which penetrates the welding wire 53) may be twisted or entangled by the rotation of the rotary cylinder 20P and the rotary cylinder 21.

  Accordingly, the above-described automatic pipe end welding apparatus 100 operates as follows. In a state where compressed air is not supplied to the piston chamber 23 of the rotating cylinder 21, the piston 24 is positioned at the right end of FIG. 3 by the force of the compression spring 28, and the advancing and retracting shaft 42 of the centering jig 40 is the force of the compression spring 45. To the right end of FIG. At this time, the tip end of the axial length adjustment bolt 31 and the rear end 42 a of the advancing and retracting shaft 42 are separated (FIG. 4), and the piston pipe 30 does not exert force on the advancing and retracting shaft 42. Therefore, the taper cones at both ends of the expansion and contraction sleeve 47 are in a state of being expanded in diameter by the force of the compression spring 45.

  In this state, when the control valve V is operated to introduce the compressed air of the compressed air source C into the piston chamber 23, the piston 24 moves leftward as shown in FIG. Push. For this reason, the distance between the movable cone 43 fixed to the tip of the advancing and retracting shaft 42 and the fixed cone 46 increases, and the diameter of the expansion / contraction sleeve 47 decreases due to its own elasticity, and the pipe member P (centering opening) It can be inserted inside. In this state, as shown in FIG. 1 and FIG. 3, when the centering jig 40 is inserted into the pipe member P and then the supply of compressed air to the piston chamber 23 is stopped, the force of the compression spring 28 causes the piston 24 to The (piston pipe 30) goes to the right, and the advancing and retracting shaft 42 goes to the right by the force of the compression spring 45. Therefore, the diameter of the expansion and contraction sleeve 47 is increased again, and the centering jig 40 is fixed to the pipe member P. 4 illustrates a state in which the outer peripheral surfaces of both ends of the expansion and contraction sleeve 47 are separated from the inner peripheral surface of the pipe member P for convenience of illustration.

  In this manner, in the state where the centering jig 40 is fixed to the pipe member P, the distance between the welding wire 53 held by the welding torch 50, the pipe member P and the pipe end welded portion (circumferential welded portion) of the pipe support hole H When the motor 14 and the wire feeding device 54 are driven while keeping the proper, circumferential welding is performed. That is, if the motor 14 is driven while the arc is generated from the welding torch 50 and the rotating body 20 and the rotating cylinder 20P are rotated, the welding torch 50 becomes the tube member P along with the rotational force of the rotating cylinder 20P. By rotating the welding wire 53 at a suitable speed along the periphery of the end of the wire, and sending out the welding wire 53 from the wire reel 55 at this time, the arc generated by the welding torch 50 circles the joint between the tube member P and the tube support plate W It can be circumferential welded.

  At the time of this circumferential welding, in the present embodiment, the rotating cylinder 21 and the piston 24 rotate together with the rotating body 20. On the other hand, the centering jig 40 inserted into the pipe member P does not rotate because the bearing 32 can freely rotate relative to the rotary cylinder 20P. The piston pipe 30 is fixed to the piston 24 and does not penetrate the rotating body 20, so the axial length of the entire device can be shortened. In addition, since the rotating cylinder 21 is closed by the cylinder cover 22 and the piston pipe 30 does not protrude from the cylinder cover 22, the wire feeding device 54 or the like may be attached to the cylinder cover 22 as in the embodiment. The wire reel 55 can be freely disposed, and the degree of freedom of the apparatus configuration is increased.

  In the above embodiment, the rotation cylinder 21 (piston pipe 30) and the piston 24 are coupled together so as to integrally rotate by the axis parallel pin 25 and the axis parallel hole 24a. For this reason, there is an advantage that a signal line or a power line can be introduced into the piston pipe 30 from the through hole 30a. Specifically, a motor power line for finely adjusting welding torch 50 back and forth and right and left can be inserted through hollow piston pipe 30. However, in the case where the signal line or the power line is not introduced into the piston pipe 30, a mode is also possible in which the piston 24 (piston pipe 30) rotates relative to the rotating cylinder 21 using the piston pipe 30 as a rod. At this time, it is also possible to directly connect the piston pipe 30 and the advancing / retracting shaft 42 of the centering jig 40.

  The above description is an embodiment in which the present invention is applied to a tube end welding apparatus for welding a tube member P inserted into a tube support hole H of a tube support plate W to the tube support plate W. The present invention is applicable to a circumferential welding apparatus generally for welding a circumferential weld centering on the centering opening.

P tube member (centering opening)
W Tube support plate H Tube support hole 100 Tube end automatic welding device (circumferential welding device)
11 Main housing (housing)
12 Coupling Pins 13 Manifold (Housing)
13a Inner flange 13b Hose connection port 14 Motor 16 Bearing 17 Line 20 Rotator 20P Rotatable cylinder (Rotor)
21 Rotating cylinder 21a radial passage (air passage)
21b Axis parallel passage (air passage)
21c shaft hole 21d slide bearing 22 cylinder cover 22a communication passage 23 piston chamber 24 piston 24a shaft parallel hole 25 shaft parallel pin 26 packing 27 ring spacer 27a ring passage (air passage)
28 compression spring 29 fixed screw 30 piston pipe (piston rod)
30a through hole 31 axial length adjustment bolt 31a lock nut 32 bearing 40 centering jig 41 support cylinder 42 forward and backward shaft 43 movable side cone 45 compression spring 46 fixed side cone 43a 46a tapered surface 47 expansion sleeve 47a slit 50 welding torch 51 Wire feeding fixed plate 53 Welding wire 54 Wire feeding device 55 Wire reel 56 Wire insertion hole V Control valve R Regulator C Compressed air source

Claims (6)

With a housing;
A rotating body rotatably supported and rotationally driven by the housing;
A welding torch supported by the rotating body;
A centering jig extending from the rotating body, including: an advancing and retracting shaft positioned at an axial center of the rotating body; and an expansion and contraction sleeve expanding and contracting an outer diameter by advancing and retracting the advancing and retracting axis in the axial direction;
An air cylinder device having a piston rod for advancing and retracting the advancing and retracting axis of the centering jig;
Have a, the air cylinder device, the circumferential welding device provided on the rotating body so as to rotate together with the rotating body,
The air cylinder device has a rotary cylinder that rotates integrally with the rotary body, and a piston having the piston rod axially slidably fitted in a piston chamber of the rotary cylinder. A circumferential welding apparatus characterized in that it is coupled to rotate integrally with a rotating cylinder . The circumferential welding device according to claim 1 , wherein the piston rod comprises a hollow piston pipe, and a plurality of radial through holes for introducing signal lines or power lines into the piston pipe. Circumferential welding device that is formed. The circumferential welding device according to claim 1 or 2, wherein the rotating cylinder is in direct sliding contact with the housing, and a ring-like air passage is formed on the sliding surface of the housing with the rotating cylinder. A circumferential welding device is formed in the rotating cylinder, regardless of the rotational position of the rotating cylinder, with an air flow passage communicating with the ring-like air passage and guiding compressed air to the piston chamber. The circumferential welding device according to any one of claims 1 to 3 , wherein the piston rod of the air cylinder device and the advancing / retracting shaft of the centering jig are separate members, and are always separated. Welding equipment. The circumferential welding apparatus according to any one of claims 1 to 4 ,
A circumferential welding apparatus in which the rotating body and the centering jig are relatively rotatably coupled. The circumferential welding apparatus according to any one of claims 1 to 5 ,
A circumferential welding apparatus in which the rotating body and the centering jig are non-rotatably coupled to each other.

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