JP2015229184A - Automatic welding equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide automatic welding equipment that is easily attached to the outer circumferential surface of a steel pipe and can weld a steel pipe while smoothly stably running in a self-propelled manner along the outer circumferential surface.SOLUTION: Automatic welding equipment 1 is provided which comprises: a rack rail 22 provided around the outer circumferential surface of a second steel pipe pile 2B; a running device 10 that runs in a self-propelled manner along the rack rail 22; and a support chain 30, and which forms a weld bead along the outer circumferential surface of the second steel pipe pile 2B by use of a weld torch 102 held by the running device 10. The running device 10 comprises: a sprocket 101 meshed with the rack rail 22; and a motor unit 111 that rotationally drives the sprocket 101. The support chain 30 is wound around the second steel pipe pile 2B to pull the running device 10 towards the outer circumferential surface of the second steel pipe pile 2B, and is in contact with the outer circumferential surface of the second steel pipe pile 2B via a roller member rotatable along the second steel pipe pile 2B.

Description

  The present invention relates to an automatic welding apparatus.

  Patent Document 1 describes a welding apparatus (automatic welding apparatus) that automatically welds steel pipe piles. This welding device includes a self-propelled device, and is configured to be able to weld the steel pipe pile while moving along the outer peripheral surface of the steel pipe pile.

JP 2012-035309 A

  The welding device disclosed in Patent Document 1 includes a self-propelled device including wheels that rotate along the outer peripheral surface of the steel pipe pile. The self-propelled device of Patent Document 1 travels by friction between the outer peripheral surface of the steel pipe pile and the wheel. Therefore, when a wheel slips with respect to the outer peripheral surface of a steel pipe pile, it becomes impossible to move a welding apparatus stably. If the welding apparatus does not travel stably, the moving speed of the nozzle becomes unstable, resulting in a problem that the quality of the welding is deteriorated.

  Then, this invention makes it a subject to provide the automatic welding apparatus which can be easily attached to the outer peripheral surface of a steel pipe, and can weld a steel pipe along the outer peripheral surface smoothly and stably.

  In order to solve the above-mentioned problems, the present invention includes a rack rail that is provided around an outer peripheral surface of a steel pipe, a traveling device that self-propels along the rack rail, and a support chain, and welding that the traveling device holds. An automatic welding device that forms a weld bead along the outer peripheral surface with a torch, wherein the traveling device includes a pinion gear that meshes with the rack rail, a power source that outputs a driving force that rotates the pinion gear, The support chain has one end attached to the traveling device, the other end is detachably locked to the traveling device, and the pinion gear meshes with the rack rail, and the other end to the other. The end is wrapped around the outer peripheral surface, attracts the traveling device to the outer peripheral surface, and is in contact with the outer peripheral surface via a roller member that can rotate along the outer peripheral surface. And features.

  In the automatic welding apparatus of the present invention, the traveling device that holds the welding torch rotates by rotating a pinion gear that meshes with a rack rail that is provided around the steel pipe. The pinion gear meshing with the rack rail does not idle with respect to the outer peripheral surface of the steel pipe. Therefore, the traveling device runs smoothly and stably along the outer peripheral surface of the steel pipe. The welding torch held by the traveling device also moves smoothly and stably along the outer peripheral surface of the steel pipe, and the quality of the weld bead formed by the welding torch is improved. Moreover, the support chain which is wound around the steel pipe and attracts the traveling device to the steel pipe is in contact with the outer peripheral surface of the steel pipe via the roller member. Therefore, the support chain smoothly and stably circulates around the outer peripheral surface of the steel pipe, and does not hinder the smooth and stable self-running of the traveling device.

  Further, the rack rail provided in the automatic welding apparatus of the present invention is provided in a cylindrical body part fitted on the steel pipe, and the body part is a hinge having a rotating shaft extending in the axial direction of the steel pipe. A member, two semi-cylindrical members that are connected by the hinge member and rotate to combine with each other in a cylindrical shape, and a clamp mechanism that locks the semi-cylindrical members that are combined in a cylindrical shape, It is characterized by providing.

According to the present invention, the rack rail is provided on a body portion in which two semi-cylindrical members are rotatably connected. The body part is easily attached to the steel pipe by being applied to the steel pipe and closed with the two semi-cylindrical members open. Moreover, it has the structure which can latch easily the trunk | drum part attached to the steel pipe by the two semi-cylindrical members combined in the cylindrical shape being locked by the clamp mechanism.
Thus, the automatic welding apparatus of the present invention is easily attached to the steel pipe.

  Further, the traveling device provided in the automatic welding apparatus of the present invention is a lifting mechanism capable of moving the welding torch in the axial direction of the steel pipe while being attracted to the steel pipe by the support chain, and the steel pipe. A longitudinal movement mechanism capable of moving the welding torch in the direction of approaching and separating, and a direction orthogonal to the movement direction of the welding torch by the forward / backward movement mechanism and perpendicular to the movement direction of the welding torch by the lifting mechanism A lateral movement mechanism capable of moving the welding torch, and a rotation mechanism capable of rotating the welding torch around a rotation axis whose axial direction is the movement direction of the welding torch by the lifting mechanism. .

  According to the present invention, the welding torch can be freely moved with respect to the steel pipe. Therefore, it is easy to set the position (welding position) where the weld bead is formed.

  In the present invention, the steel pipe around which the rack rail is provided and the support chain is wound is a second steel pipe pile to be added to the first steel pipe pile embedded in the ground, and the welding torch includes The welded bead is formed at a connection portion between the first steel pipe pile and the second steel pipe pile, and the first steel pipe pile and the second steel pipe pile are held by the traveling device so as to weld each other. To do.

The automatic welding apparatus of the present invention is configured to be able to weld a connection portion between a first steel pipe pile embedded in the ground and a second steel pipe pile added to the first steel pipe pile. When the second steel pipe pile is added to the first steel pipe pile buried in the vertical direction, the second steel pipe pile is arranged upward. Moreover, the connection part of a 1st steel pipe pile and a 2nd steel pipe pile can be made close to the surface of a ground.
In the automatic welding apparatus of the present invention, a rack rail and a traveling device are arranged on the second steel pipe pile that is added upward. Therefore, the work of attaching the rack rail and the traveling device is facilitated. Moreover, the welding torch can weld the joint part arrange | positioned near the lower ground surface.
When an operator manually welds a joint near the surface of the ground, the posture becomes unstable, such as bending down, and the quality of welding is lowered. The automatic welding apparatus of the present invention can weld the connection portion with a welding torch held by a traveling device that smoothly and stably runs along the outer peripheral surface of the second steel pipe pile. The quality of welding to the connection part of 2 steel pipe piles improves. Moreover, a welding position can be changed easily and the quality of the welding with respect to the connection part of a 1st steel pipe pile and a 2nd steel pipe pile is further improved.

  ADVANTAGE OF THE INVENTION According to this invention, the automatic welding apparatus which can be easily attached to the outer peripheral surface of a steel pipe, and can weld a steel pipe can be provided, being self-propelled smoothly along the outer peripheral surface.

It is a perspective view of an automatic welding apparatus. It is a perspective view of a traveling device. It is an enlarged view of a welding part. (A) is a perspective view of a travel guide, (b) is a perspective view of a clamp mechanism. (A) is a figure which shows the structure of a support chain, (b) is a figure which shows a chain attaching part. It is a figure which shows the state in which a traveling apparatus is attached. It is a figure which shows the state which a sprocket meshes with the rack rail of a traveling guide. (A) is a figure which shows the state in which a support chain is latched by the latching plate of a traveling apparatus, (b) is a figure which shows the state in which a support chain contacts a steel pipe pile via a roller member. It is a figure which shows adjustment of a welding position, (a) is a figure which shows adjustment of the front-back direction and an up-down direction, (b) is a figure which shows adjustment of the left-right direction.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
FIG. 1 is a perspective view of an automatic welding apparatus.
As shown in FIG. 1, the automatic welding apparatus 1 includes a traveling device 10, a traveling guide 20, and a support chain 30.
The traveling guide 20 is fixed to the outer peripheral surface of the steel pipe (second steel pipe pile 2B) to be added to the steel pipe (first steel pipe pile 2A) embedded in the ground G with a pile driving machine or the like. The support chain 30 is wound around the outer peripheral surface of the second steel pipe pile 2B with both ends attached to the traveling device 10.

  The traveling device 10 includes a pinion gear (sprocket 101) and a power source (motor unit 111). The sprocket 101 meshes with the rack rail 22 of the travel guide 20 and rotates with a driving force output by a motor (not shown) of the motor unit 111. Electric power is supplied to the motor unit 111 from the power supply device 3. For example, the power supply device 3 supplies the motor unit 111 with power taken from a commercial power supply of 100 V that is fed to a general household. The traveling device 10 self-propels along the outer peripheral surface of the second steel pipe pile 2B by rotating the sprocket 101 with the driving force output from the motor unit 111 when the switch SW is turned on.

  The power source that outputs the driving force for rotating the sprocket 101 is not limited to the motor unit 111. For example, the automatic welding apparatus 1 provided with a small engine (internal combustion engine) as a power source may be used.

The traveling device 10 holds the welding torch 102. The welding torch 102 is configured to form weld beads on the outer peripheral surfaces of the first steel pipe pile 2A and the second steel pipe pile 2B. The welding torch 102 of the present embodiment forms a weld bead at the connection between the first steel pipe pile 2A embedded in the ground G and the second steel pipe pile 2B to be added, and the first steel pipe pile 2A and the second steel pipe. The piles 2B are welded together.
The welding torch 102 is connected to a welding machine body 4 such as an engine welding machine. It is assumed that the welding torch 102 and the welder main body 4 of this embodiment are capable of inner shield welding.
When the welding machine body 4 is activated, the welding torch 102 forms a weld bead at the connection between the first steel pipe pile 2A and the second steel pipe pile 2B, and welds the first steel pipe pile 2A and the second steel pipe pile 2B (inner Shield welding).

  When the switch SW of the traveling device 10 (motor unit 111) is turned on with the welding machine main body 4 activated, the welding torch 102 and the outer periphery of the first steel pipe pile 2A and the second steel pipe pile 2B together with the traveling device 10 that is self-propelled. A weld bead is formed at the connection between the first steel pipe pile 2A and the second steel pipe pile 2B while moving along the surface. Thereby, the 1st steel pipe pile 2A and the 2nd steel pipe pile 2B are welded.

  In addition, let the 2nd steel pipe pile 2B side be the front (Fr) of the traveling apparatus 10 in FIG. Further, the direction in which the first steel pipe pile 2A and the second steel pipe pile 2B extend (the axial direction of the first steel pipe pile 2A and the second steel pipe pile 2B) is the vertical direction of the traveling device 10, and the ground G side is downward (Dn ). Further, the rear (Re) of the traveling device 10 is a side with respect to the front, and the upper (Up) is a side with respect to the lower side. The second steel pipe pile 2 </ b> B is disposed in front of the traveling device 10.

  When the first steel pipe pile 2A is buried in the vertical direction, the second steel pipe pile 2B is added above the first steel pipe pile 2A. The traveling guide 20 is attached to the second steel pipe pile 2B that is added above the first steel pipe pile 2A. The connecting portion between the first steel pipe pile 2A and the second steel pipe pile 2B is below the traveling guide 20. Therefore, the welding torch 102 is disposed below the traveling guide 20. In the traveling device 10, the welding torch 102 is held below the sprocket 101 that meshes with the rack rail 22 of the traveling guide 20.

FIG. 2 is a perspective view of the traveling device. FIG. 3 is an enlarged view of the welded portion.
As shown in FIG. 2, the traveling device 10 includes a traveling unit 10a and a welding unit 10b.

The traveling unit 10 a includes a sprocket 101 and a motor unit 111. The motor unit 111 outputs a driving force to rotate the sprocket 101. The traveling unit 10a includes two sprockets (a driving sprocket 101a and a driven sprocket 101b).
The drive sprocket 101a and the driven sprocket 101b are arranged side by side in the left-right direction in front of the traveling device 10.
The traveling device 10 has a left-right direction as a direction orthogonal to the front-rear direction and the up-down direction, and a left side (Le) and a right side (Ri) when viewed from the front (Fr) side.
FIG. 2 shows an example in which the drive sprocket 101a is disposed on the left side and the driven sprocket 101b is disposed on the right side.

  The sprocket 101 (drive sprocket 101a, driven sprocket 101b) is attached to the rotating shaft 112a. The rotating shaft 112 a is a shaft member extending in the vertical direction, and is rotatably supported by a bearing portion 112 provided in front of the motor unit 111. In FIG. 2, two bearing portions 112 are illustrated for one rotating shaft 112 a, but the number of bearing portions 112 is not limited.

  Further, the rotating shaft 112 a of the sprocket 101 is provided with rolling wheels 114. The rolling wheel 114 rotates integrally with the rotating shaft 112a. The rolling wheels 114 are in contact with the outer peripheral surface of the second steel pipe pile 2B (see FIG. 1) and cause the traveling device 10 to travel together with the sprocket 101. For example, the sprocket 101 is provided at the upper end of the rotating shaft 112a, and the rolling wheels 114 are provided at the lower end. The rotating shaft 112 a is supported by the bearing portion 112 between the sprocket 101 and the rolling wheel 114. In addition, in the rotating shaft 112a, another rolling wheel 114 may be provided between the end provided with the sprocket 101 and the end provided with the rolling wheel 114. The number of rolling wheels 114 is not limited.

A driving pulley 113 is attached to the rotating shaft 112a of the driving sprocket 101a. A driving chain 110 a that transmits a driving force output from the motor unit 111 is wound around the driving pulley 113. The drive chain 110 a is wound around a motor (not shown) provided in the motor unit 111 and a drive pulley 113.
A transmission chain 110b is wound around the rotating shaft 112a of the drive sprocket 101a and the rotating shaft 112a of the driven sprocket 101b.

  A driving force (a driving force output from the motor unit 111) generated by a motor (not shown) of the motor unit 111 is transmitted to the driving sprocket 101a via the driving chain 110a. The driving force transmitted to the drive sprocket 101a is transmitted to the driven sprocket 101b via the transmission chain 110b. Thus, the driving force output from the motor unit 111 is transmitted to the driving sprocket 101a and the driven sprocket 101b. Therefore, both the driving sprocket 101a and the driven sprocket 101b are rotated by the driving force output from the motor unit 111. The driving sprocket 101a and the driven sprocket 101b rotate in the same direction.

The welded portion 10b is attached to the fixed plate 121a. The fixed plate 121a is attached to a front plate 129 provided in front of the welded portion 10b. The welding torch 102 is attached to the welded portion 10 b and is held by the traveling device 10.
The front plate 129 is a flat plate that faces in the front-rear direction, and the side (the right side in the present embodiment) on which the welded portion 10 b is provided extends from the motor unit 111. In addition, the structure with which the welding part 10b is provided in the left side of the motor unit 111 may be sufficient.

The fixed plate 121a is attached to a portion of the front plate 129 that extends from the motor unit 111. The fixed plate 121a is a flat plate having a flat surface in the vertical direction.
A lifting device 122 is attached below the fixed plate 121a.

As shown in FIG. 3, the elevating device 122 has a main body upper part 122u and a main body lower part 122d. The main body upper portion 122u is fixed to the lower surface of the fixed plate 121a. The main body upper portion 122u is fastened and fixed to the fixing plate 121a by the screw member S1.
The main body lower portion 122d is connected to the lower portion of the main body upper portion 122u via the feed screw 121. The feed screw 121 extends in the vertical direction (that is, the axial direction of the first steel pipe pile 2A and the second steel pipe pile 2B).

  Reference numeral 121b denotes a mounting plate for attaching the fixing plate 121a to the front plate 129 (see FIG. 2). The mounting plate 121b is a flat plate that comes into surface contact with the front plate 129, and the end side of the fixed plate 121a is fixed by welding or the like. The fixed plate 121a is erected on the mounting plate 121b. The mounting plate 121b is fastened and fixed to the front plate 129 by the screw member S2.

  An upper / lower position fine adjustment dial 122a is provided on the upper body 122u. The vertical position fine adjustment dial 122a and the feed screw 121 constitute a feed screw mechanism (not shown). When the vertical position fine adjustment dial 122a is rotated, the feed screw 121 moves up and down in the axial direction. Further, the main body lower portion 122d moves up and down as the feed screw 121 moves up and down.

The main body lower part 122d is provided with a torch fixing part 125 having a first arm 124a and a second arm 124b.
The first arm 124a is attached to the lower body portion 122d. The first arm 124a is rotatably provided around a rotation shaft (first rotation shaft 127a) extending in a direction orthogonal to the feed screw 121 (a direction orthogonal to the vertical direction). The second arm 124b is attached to the first arm 124a. The second arm 124b is rotatably provided around a rotation axis (second rotation axis 127b) substantially parallel to the first rotation axis 127a.
A torch fixing head 126 is attached to the second arm 124b.

  The torch fixing head 126 has a torch holder 126a. The main body of the welding torch 102 is fitted into the torch holder 126a. The torch holder 126a is attached to the fixed base 126b. The fixed base 126b is attached to the head main body 126c. The head main body 126c is attached to the head rotating portion 126d.

  The first rotating shaft 127a is provided with a first fixing lever 130a. One end of the first rotating shaft 127a is fixed to the main body lower part 122d, and a male screw (not shown) is formed at the other end. The first arm 124a is loosely fitted on the first rotation shaft 127a. The first fixing lever 130a is screwed from the outside of the first arm 124a that is loosely fitted to the first rotation shaft 127a. When the first fixing lever 130a is loosened, the first arm 124a can be rotated around the first rotation shaft 127a. When the first fixing lever 130a is tightened, the rotation of the first arm 124a is restricted.

  The second rotating shaft 127b is provided with a second fixing lever 130b. One end of the second rotating shaft 127b is fixed to the first arm 124a, and a male screw (not shown) is formed at the other end. The second arm 124b is loosely fitted on the second rotating shaft 127b. The second fixing lever 130b is screwed from the outside of the second arm 124b loosely fitted on the second rotating shaft 127b. When the second fixing lever 130b is loosened, the second arm 124b can rotate around the second rotation shaft 127b. When the second fixing lever 130b is tightened, the rotation of the second arm 124b is restricted.

  The head rotating unit 126d is attached to the second arm 124b. The head rotating part 126d has two support parts 126d1 and 126d1 and a rotating body 126d2. The two support portions 126d1 and 126d1 are attached in two stages along the axial direction of the second arm 124b, and both extend from the second arm 124b. The two support portions 126d1 and 126d1 support the rotating shaft 126d3. The axial direction of the rotating shaft 126d3 coincides with the axial direction of the second arm 124d. The rotating body 126d2 is disposed between the two support portions 126d1 and 126d1, and is provided to be rotatable around the rotating shaft 126d3.

  A male screw is formed at one end of the rotating shaft 126d3, and a rotating dial 126d4 is provided at the other end. In addition, a female screw into which the rotation shaft 126d3 is screwed is formed in one support portion 126d1, and a through-hole through which the rotation shaft 126d3 is inserted is formed in the other support portion 126d1. The rotating shaft 126d3 passes through the rotating body 126d2 from the side of the support portion 126d1 where the through hole is formed, and is screwed into the female screw of the support portion 126d1.

  When the rotary dial 126d4 is tightened, the two-stage support portions 126d1 and 126d1 tighten the rotary body 126d2 to restrict the rotation of the rotary body 126d2. When the rotary dial 126d4 is loosened, the tightening by the two-stage support portions 126d1 and 126d1 is released, and the rotary body 126d2 can be rotated.

  The rotating body 126d2 is provided with a lateral axis 126c1. The head main body 126c is attached to the rotary main body 126d2 via the horizontal axis 126c1. The axial direction of the lateral shaft 126c1 coincides with the axial directions of the first rotating shaft 127a and the second rotating shaft 127b. That is, the lateral axis 126c1 is provided substantially in parallel with the first rotation axis 127a and the second rotation axis 127b. Further, the lateral shaft 126c1 is provided so as to be axially displaceable with respect to the rotating body 126d2. Accordingly, the head main body 126c can be displaced in a direction in which the head main body 126c approaches and separates from the rotating main body 126d2.

  The rotation main body 126d2 is provided with a main body lock dial 126c2. The main body lock dial 126c2 has a shaft portion 126c3 screwed into the rotary main body 126d2. The tip of the shaft portion 126c3 abuts on the lateral shaft 126c1 inside the rotating body 126d2. When the main body lock dial 126c2 is tightened, the distal end of the shaft portion 126c3 abuts on the lateral shaft 126c1, and the displacement of the lateral shaft 126c1 is restricted. When the main body lock dial 126c2 is loosened, the tip of the shaft portion 126c3 is separated from the lateral shaft 126c1, and the lateral shaft 126c1 can be displaced. When the lateral shaft 126c1 can be displaced, the head body 126c attached to the lateral shaft 126c1 can be displaced.

  Thus, the head main body 126c is attached to the rotary main body 126d2. When the rotating main body 126d2 becomes rotatable, the head main body 126c becomes rotatable around the rotation shaft 126d3 together with the rotating main body 126d2. When the rotation of the rotating body 126d2 is restricted, the head body 126c is fixed.

  As shown in FIG. 3, the torch fixing head 126 is attached to the lower body portion 122d of the lifting device 122 via the first arm 124a and the second arm 124b. When the first fixing lever 130a is loosened, the first arm 124a can be rotated around the first rotation shaft 127a. When the second fixing lever 130b is loosened, the second arm 124b can be rotated around the second rotation shaft 127b. As a result, the torch fixing head 126 is movable in the front-rear direction. As shown in FIG. 1, the first steel pipe pile 2 </ b> A and the second steel pipe pile 2 </ b> B are disposed in front of the traveling device 10. Further, the welding torch 102 is fitted in the torch holder 126 a of the torch fixing head 126. Therefore, the 1st arm 124a and the 2nd arm 124b become a back-and-forth movement mechanism which can move the welding torch 102 in the direction which approaches and separates from the 2nd steel pipe pile 2B and the 2nd steel pipe pile 2B.

As shown in FIG. 3, the torch fixing head 126 is attached to the lower body 122 d of the lifting device 122. The main body lower portion 122d is movable in the axial direction of the first steel pipe pile 2A and the second steel pipe pile 2B (the axial direction of the feed screw 121) by a feed screw mechanism configured in the main body upper portion 122u. Therefore, the torch fixing head 126 is movable in the axial direction of the first steel pipe pile 2A and the second steel pipe pile 2B (the axial direction of the feed screw 121).
Thus, the raising / lowering apparatus 122 of this embodiment becomes an raising / lowering mechanism which can move the welding torch 102 to the axial direction (namely, up-down direction) of 2 A of 1st steel pipe piles and 2B.

  The head main body 126c of the torch fixed head 126 is attached to the rotary main body 126d2 of the head rotating portion 126d. The rotating body 126d2 is provided to be rotatable around a rotating shaft 126d3. Therefore, the head main body 126c can be rotated around the rotation shaft 126d3. The axial direction of the rotating shaft 126d3 changes as the first arm 124a and the second arm 124b rotate, and can coincide with the axial direction of the feed screw 121. Further, the welding torch 102 provided in the torch fixing head 126 is moved in the axial direction of the feed screw 121 by the lifting mechanism. Therefore, the head rotating portion 126d is a rotating mechanism that can move the welding torch 102 about the rotating shaft 126d3 whose axial direction is the moving direction of the welding torch 102 by the lifting mechanism.

  Furthermore, the head main body 126c can be displaced in the axial direction of the lateral axis 126c1 with respect to the head rotating portion 126d. As described above, the lateral shaft 126c1 is provided substantially in parallel with the first rotation shaft 127a (second rotation shaft 127b). Further, the welding torch 102 attached to the head main body 126c has a first arm 124a rotatable around the first rotation shaft 127a and a second arm 124b rotatable around the second rotation shaft 127b. The steel pipe pile 2A and the second steel pipe pile 2B move toward and away from each other. Accordingly, the lateral axis 126c1 is orthogonal to the moving direction of the welding torch 102 by the first arm 124a and the second arm 124b (front and rear moving mechanism), and is orthogonal to the moving direction (vertical direction) of the welding torch 102 by the lifting mechanism. This is a lateral movement mechanism capable of moving the welding torch 102 in the direction to be moved.

As described above, the welding torch 102 attached to the torch holder 126a of the head main body 126c (fixed base 126b) is movable in the vertical direction, the front-rear direction, and the left-right direction with respect to the traveling device 10 (see FIG. 1). . Further, the welding torch 102 can be rotated around a rotation axis extending in the vertical direction.
Therefore, the position (welding position) where the welding torch 102 forms the weld bead can be easily adjusted in the welded portion 10b (see FIG. 1) of the traveling device 10.

  As shown in FIG. 2, the traveling device 10 includes a locking plate 128 that locks the support chain 30 (see FIG. 1) and a chain attachment portion 301 to which the support chain 30 is attached. The locking plate 128 is, for example, a plate-like member that spreads to the right of the traveling device 10 and faces a plane forward. When the locking plate 128 is provided on the right side, the locking plate 128 is formed with a notch portion 128a that is open on the right side. The support chain 30 is detachably locked to the cutout portion 128a of the locking plate 128. The notch 128 a is formed below the sprocket 101. Details of the chain attachment portion 301 will be described later.

4A is a perspective view of the travel guide, and FIG. 4B is a perspective view of the clamp mechanism. As illustrated in FIG. 4A, the travel guide 20 includes a body portion 21 and a rack rail 22.
The trunk | drum 21 exhibits the cylindrical shape externally fitted by the 2nd steel pipe pile 2B. The rack rail 22 is provided around the entire outer peripheral surface of the body portion 21. The rack rail 22 is disposed at the lower end of the body portion 21. The rack rail 22 meshes with the sprocket 101 (see FIG. 1) of the traveling device 10.
For example, a chain that meshes with the sprocket 101 of the traveling device 10 is wound around the outer peripheral surface along the circumferential direction of the body portion 21 to form the rack rail 22. The chain that becomes the rack rail 22 is attached to the lower end of the body portion 21 by welding, brazing, or the like.

The body portion 21 having a cylindrical shape includes two semi-cylindrical members 21a and 21b. The trunk | drum 21 is divided | segmented into two semi-cylindrical members 21a and 21b by the virtual partial cross section parallel to the axial direction of the 2nd steel pipe pile 2B. One end of each of the two semi-cylindrical members 21 a and 21 b is connected via a hinge member 23. The hinge member 23 has a rotation shaft extending in the vertical direction. The two semi-cylindrical members 21 a and 21 b are connected to each other so as to be rotatable around the rotation axis of the hinge member 23.
A clamp mechanism 24 is provided at the open ends (one end not connected by the hinge member 23) of the semi-cylindrical members 21a and 21b.
In addition, the trunk | drum 21 has an internal diameter according to the outer diameter of the 2nd steel pipe pile 2B which attaches the said travel guide 20. As shown in FIG.

As shown in FIG. 4B, the clamp mechanism 24 includes a hook portion 24a and an operation portion 24b. When the hook portion 24a is attached to one semicylindrical member 21a, the operation portion 24b is attached to the other semicylindrical member 21b.
The hook portion 24a is formed such that one end of a sheet metal member attached to the outer peripheral surface of the semi-cylindrical member 21a rises toward the outer side in the circumferential direction and warps in the opposite direction to the other semi-cylindrical member 21b. Is done. The hook part 24a is attached to the outer peripheral surface of the semi-cylindrical member 21a by welding or brazing.

  The operation unit 24 b includes a clamp lever 240 and an engagement ring 241. The clamp lever 240 rotates so as to incline in a direction away from the semi-cylindrical member 21a (that is, a direction away from the hook portion 24a) from a state where it rises toward the outer side in the circumferential direction of the semi-cylindrical member 21b. . The clamp lever 240 rotates around the rotation shaft 240a. The rotation shaft 240a extends in the vertical direction. The rotating shaft 240a is attached to the outer peripheral surface of the semi-cylindrical member 21b via the attachment plate 240c, for example. The attachment plate 240c is attached to the outer peripheral surface of the semi-cylindrical member 21b, and one end is wound around the rotation shaft 240a to support the rotation shaft 240a. The attachment plate 240c is attached to the outer peripheral surface of the semicylindrical member 21b by welding or brazing.

  The engagement ring 241 has an annular portion 241a and a shaft portion 241b. The shaft portion 241b is rotatably attached around an attachment shaft 240b provided in the clamp lever 240. The attachment shaft 240b is an axis parallel to the rotation shaft 240a, and goes around the rotation shaft 240a as the clamp lever 240 rotates. The attachment shaft 240b moves in a direction away from the semi-cylindrical member 21a (hook portion 24a) when the clamp lever 240 tilts in the opposite direction to the semi-cylindrical member 21a.

  The annular portion 241a is formed by bending an end portion of the shaft portion 241b into an annular shape (or a similar shape) ((b) in FIG. 4 illustrates a triangular annular portion 241a). The annular portion 241a engages with a hook portion 24a attached to the semi-cylindrical member 21a.

When the attachment shaft 240b moves away from the hook portion 24a as the clamp lever 240 tilts, the shaft portion 241b of the engagement ring 241 attached to the attachment shaft 240b is displaced in a direction away from the hook portion 24a. .
When the annular portion 241a is engaged with the hook portion 24a and the shaft portion 241b is displaced in a direction away from the hook portion 24a, the annular portion 241a pulls the hook portion 24a toward the semi-cylindrical member 21b. For example, when the clamp lever 240 is tilted, the semicylindrical member 21a and the semicylindrical member 21b are locked together.

As described above, the clamp mechanism 24 can easily lock the semi-cylindrical member 21a to the semi-cylindrical member 21b by tilting the clamp lever 240.
In other words, the clamp mechanism 24 of the present embodiment is rotated around the rotation axis of the hinge member 23 to lock the semi-cylindrical members (21a, 21b) in a combined state in a cylindrical shape.

FIG. 5A is a view showing the structure of the support chain, and FIG. 5B is a view showing the chain mounting portion.
As shown in FIG. 5A, in the support chain 30, an outer plate 31 a disposed on the outer side and an inner plate 31 b disposed on the inner side are alternately connected by connection pins 32. That is, the outer plate 31 a and the inner plate 31 b are provided at both ends of the connection pin 32. The outer plates 31a provided at both ends of the connection pin 32 face each other. Further, the inner plates 31b provided at both ends of the connection pin 32 face each other. The outer plate 31a and the inner plate 31b are connected to each other so as to be rotatable about the connection pin 32 as an axis.

  A roller member 33 is provided between the opposed inner plates 31b. The roller member 33 has a cylindrical shape, and the connection pin 32 passes through the center. The roller member 33 is provided so as to be rotatable (spinned) about the connection pin 32 as an axis. The shaft member (outer diameter) of the roller member 33 is thicker than the widths of the outer plate 31a and the inner plate 31b, and the outer peripheral surface of the roller member 33 projects outward from the outer plate 31a and the inner plate 31b.

  An attachment portion 35 is provided at one end of the support chain 30. The attachment portion 35 includes a pair of extension portions 35a formed by extending the inner plate 31b and attachment holes 35b. The attachment hole 35b penetrates the end portion of each extending portion 35a. The attachment hole 35b penetrates the extending portion 35a in the same direction as the axial direction of the connection pin 32.

  The other end of the support chain 30 is provided with a locking portion 34. The locking portion 34 includes a body portion 34a, a locking shaft 34b, and a lock nut 34c. The body portion 34a is rotatably provided around the connection pin 32 between the opposed outer plates 31a (or opposed inner plates 31b). The locking shaft 34 b extends from the body portion 34 a in a direction orthogonal to the connection pin 32. A male screw is formed on the locking shaft 34b. The lock nut 34c is a disc-shaped nut and is screwed into the male screw of the locking shaft 34b.

  Further, in the chain attachment portion 301 of the traveling device 10 shown in FIG. 2, as shown in FIG. 5B, two mount portions (an upper mount portion 302 and a lower mount portion 303) are arranged vertically. . The two mount portions are attached to the front plate 129 and protrude toward the front. The upper mount portion 302 has a through hole 302a through which the screw member 304 is inserted in the vertical direction. The lower mount portion 303 is provided with a screw hole 303a (female screw) into which the screw member 304 is screwed in the vertical direction. The through hole 302a and the screw hole 303a are formed coaxially.

  The extending portion 35 a provided in the mounting portion 35 of the support chain 30 enters between the upper mount portion 302 and the lower mount portion 303. At this time, the mounting hole 35b, the through hole 302a, and the screw hole 303a are coaxially arranged. Then, the screw member 304 is inserted from above through the through hole 302a and the attachment hole 35b in this order and screwed into the screw hole 303a, so that the support chain 30 is attached to the chain attachment portion 301.

  The automatic welding apparatus 1 (see FIG. 1) of the present embodiment includes a traveling device 10 shown in FIG. 2, a traveling guide 20 shown in FIG. 4, and a support chain 30 shown in FIG.

  And as shown with the dashed-two dotted line in (a) of FIG. 4, the driving | running | working guide 20 is applied to the outer peripheral surface of the 2nd steel pipe pile 2B in the state in which the two semi-cylindrical members 21a and 21b were opened, Thereafter, as shown by the solid line, the semi-cylindrical members 21a and 21b are closed. Thus, the traveling guide 20 is arranged so that the body portion 21 surrounds the outer peripheral surface of the second steel pipe pile 2B. Then, as shown in FIG. 4B, the clamp lever 240 is tilted in a state where the annular portion 241a of the engagement ring 241 is engaged with the hook portion 24a. As a result, the hook portion 24a with which the annular portion 241a is engaged is drawn toward the semi-cylindrical member 21b, and the semi-cylindrical member 21a and the semi-cylindrical member 21b are locked together. When the inner diameter of the body part 21 is substantially equal to or slightly smaller than the outer diameter of the second steel pipe pile 2B, the second steel pipe pile 2B is fastened to the body part 21, and the traveling guide 20 is attached to the second steel pipe pile 2B.

FIG. 6 is a view showing a state where the traveling device is attached, and FIG. 7 is a view showing a state where the sprocket meshes with the rack rail of the traveling guide.
As shown in FIG. 6, the traveling device 10 is arranged with respect to the traveling guide 20 attached to the second steel pipe pile 2B. At this time, the sprocket 101 meshes with the rack rail 22 as shown in FIG.

  As shown in FIG. 6, the second steel pipe pile 2 </ b> B is disposed in front of the traveling device 10 (Fr). In addition, as shown in FIG. 1, the welding torch 102 is disposed below (Dn) the traveling device 10. And the position of the welding torch 102 becomes the position of the connection part of 2 A of 1st steel pipe piles, and the 2nd steel pipe pile 2B. That is, the traveling guide 20 may be attached to the second steel pipe pile 2B so that the welding torch 102 is positioned at the connecting portion between the first steel pipe pile 2A and the second steel pipe pile 2B when the traveling device 10 is attached. preferable.

FIG. 8A is a view showing a state where the support chain is locked to the locking plate of the traveling device, and FIG. 8B is a view showing a state where the support chain is in contact with the steel pipe pile via the roller member.
As shown in FIG. 6, the support chain 30 is attached to the traveling device 10 disposed at the position of the traveling guide 20. The support chain 30 is wound around the second steel pipe pile 2B along the outer peripheral surface in a state where the attachment portion 35 is attached to the chain attachment portion 301. Then, the locking portion 34 of the support chain 30 is detachably locked to the locking plate 128.
At this time, as shown in FIG. 8A, the locking shaft 34 b of the locking portion 34 is fitted into the notch 128 a of the locking plate 128. Further, the lock nut 34 c is disposed behind the locking plate 128. Note that the cutout portion 128a is formed in such a size that the locking shaft 34b is locked and the lock nut 34c does not pass through.
When the lock nut 34c is tightened, the locking shaft 34b is sent backward. As a result, the support chain 30 tightens the second steel pipe pile 2B (see FIG. 6).

  When the lock nut 34c is properly tightened in this way and the support chain 30 tightens the second steel pipe pile 2B, the traveling device 10 is attracted to the second steel pipe pile 2B and attached to the second steel pipe pile 2B. In addition, the traveling device 10 is attracted to the second steel pipe pile 2B, so that the sprocket 101 shown in FIG. This effectively prevents the sprocket 101 from slipping relative to the rack rail 22. Accordingly, the traveling device 10 can smoothly run.

  As shown in FIG. 8B, the support chain 30 contacts the second steel pipe pile 2 </ b> B through the roller member 33. The support chain 30 is arranged so that the connection pins 32 are in the vertical direction. And the roller member 33 which makes the connection pin 32 a rotating shaft becomes rotatable along the outer peripheral surface of the 2nd steel pipe pile 2B. Therefore, the support chain 30 can go around along the outer peripheral surface of the second steel pipe pile 2B. Therefore, as shown in FIG. 6, the traveling device 10 to which the support chain 30 is attached by tightening the second steel pipe pile 2B can go around along the outer peripheral surface of the second steel pipe pile 2B.

  The sprocket 101 that rotates with the driving force output by the motor unit 111 shown in FIG. 1 circulates around the travel guide 20 while meshing with the rack rail 22. Therefore, when the sprocket 101 is rotated by the driving force output from the motor unit 111, the traveling device 10 circulates (self-propelled) the second steel pipe pile 2B along the outer peripheral surface.

If the welding torch 102 attached to the traveling device 10 is in a state in which weld beads can be formed on the outer peripheral surfaces of the first steel pipe pile 2A and the second steel pipe pile 2B, the traveling device 10 has an outer periphery of the second steel pipe pile 2B. Automatic welding in which the welding torch 102 welds the connecting portion of the first steel pipe pile 2A and the second steel pipe pile 2B while turning around the surface (self-propelled) becomes possible.
That is, in the automatic welding apparatus 1 of the present embodiment shown in FIG. 1, while the traveling device 10 is self-propelled along the outer peripheral surface of the second steel pipe pile 2B, the welding torch 102 is connected to the first steel pipe pile 2A and the second steel pipe pile. The automatic welding which welds the connection part of 2B is comprised.

FIG. 9 is a diagram showing adjustment of the welding position, (a) is a diagram showing adjustment in the front-rear direction and up-down direction, and (b) is a diagram showing adjustment in the left-right direction.
As shown in FIG. 9A, when the first fixing lever 130a is loosened, the first arm 124a can swing up and down (Dir1). Further, when the second fixing lever 130b is loosened, the second arm 124b can swing in the front-rear direction (Dir2). Therefore, the position of the welding position by the welding torch 102 in the front-rear direction can be adjusted by loosening the first fixing lever 130a and the second fixing lever 130b.
Further, when the vertical position fine adjustment dial 122a is rotated, the lower portion 122d of the main body moves up and down (Dir3). Therefore, the vertical position of the welding position by the welding torch 102 can be adjusted by rotating the vertical position fine adjustment dial 122a.

As shown in FIG. 9B, when the main body lock dial 126c2 is loosened, the restriction on the displacement of the lateral shaft 126c1 is released, and the head body 126c can be displaced in the axial direction of the lateral shaft 126c1 ( Dir4). Therefore, the position of the welding position by the welding torch 102 in the left-right direction can be adjusted by loosening the main body lock dial 126c2.
Further, when the rotation lock dial 126d4 is loosened, the rotary main body 126d2 becomes rotatable and the head main body 126c becomes rotatable (Dir5). Therefore, the welding position by the welding torch 102 can be adjusted by loosening the rotation lock dial 126d4.

As shown in FIGS. 9A and 9B, the automatic welding apparatus 1 (see FIG. 1) of the present embodiment is configured to be able to move the welding torch 102 in five directions (Dir1 to Dir5). Therefore, the welding position by the welding torch 102 can be easily adjusted.
For example, in the automatic welding apparatus 1 that is attached to the second steel pipe pile 2B and welds the connecting portion of the first steel pipe pile 2A and the second steel pipe pile 2B as shown in FIG. Even if it is a case where it changes minutely, the automatic welding apparatus 1 of this embodiment can change a welding position easily.

As described above, the automatic welding apparatus 1 of the present embodiment shown in FIG. 1 causes the traveling apparatus 10 to self-propell along the outer peripheral surfaces of the first steel pipe pile 2A and the second steel pipe pile 2B to be welded, and thereby the first steel pipe. The connection part of the pile 2A and the 2nd steel pipe pile 2B is comprised so that automatic welding is possible.
The traveling device 10 is self-propelled by rotating the sprocket 101 that meshes with the rack rail 22 of the traveling guide 20 attached to the second steel pipe pile 2B with the driving force output from the motor unit 111. Since the sprocket 101 rotates while meshing with the rack rail 22, the sprocket 101 does not idle with respect to the rack rail 22. Therefore, when the sprocket 101 rotates at a constant speed, the traveling device 10 travels at a constant speed. Since the speed at which the welding torch 102 forms a weld bead on the outer peripheral surfaces of the first steel pipe pile 2A and the second steel pipe pile 2B becomes constant, the welding quality is improved.

Moreover, as shown to (a) of FIG. 4, the driving | running | working guide 20 only opens the two semi-cylindrical members 21a and 21b, applies to the outer peripheral surface of the 2nd steel pipe pile 2B, and latches it with the clamp mechanism 24. FIG. It is configured to be attachable to the second steel pipe pile 2B by an easy procedure.
Further, as shown in FIG. 4B, the clamp mechanism 24 is semi-cylindrical members 21a, 21b by an extremely easy procedure of engaging the engagement ring 241 with the hook portion 24a and tilting the clamp lever 240. Is configured to be able to be locked.

  In addition, if it is the automatic welding apparatus 1 provided with the some traveling guide 20 which has the trunk | drum 21 of the internal diameter corresponding to the 2nd steel pipe pile 2B from which an outer diameter differs, it will respond | correspond to the 2nd steel pipe pile 2B from which an outer diameter differs. . For example, it becomes possible to cope with the outer diameter (φ165.2, φ190.7, φ216.3, etc.) of a general second steel pipe pile 2B.

As shown in FIGS. 6 and 7, the traveling device 10 can be attached to the traveling guide 20 by an easy procedure of engaging the sprocket 101 with the rack rail 22 of the traveling guide 20 and attaching the support chain 30. ing.
Further, as shown in FIG. 8A, the support chain 30 is engaged with the traveling device 10 by an easy procedure of fitting the locking shaft 34b into the locking plate 128 of the traveling device 10 and tightening the lock nut 34c. It is configured to be able to stop.
Further, as shown in FIGS. 9A and 9B, the welding position by the welding torch 102 can be easily adjusted.

Thus, the automatic welding apparatus 1 (traveling guide 20, traveling apparatus 10) of this embodiment shown in FIG. 1 is easily attached to the outer peripheral surface of the second steel pipe pile 2B.
In addition, the traveling device 10 is self-propelled by rotating the sprocket 101 that meshes with the rack rail 22. For this reason, the idling of the sprocket 101 with respect to the 2nd steel pipe pile 2B is suppressed. The traveling device 10 can be self-propelled at a constant speed. Thereby, the speed at which the welding torch 102 forms the weld beads on the outer peripheral surfaces of the first steel pipe pile 2A and the second steel pipe pile 2B becomes constant, and the welding quality is improved.

  Moreover, as shown to (a), (b) of FIG. 9, the welding part 10b of the traveling apparatus 10 (refer FIG. 1) is comprised so that a welding position can be adjusted with an easy procedure. For this reason, the fine adjustment of the position which the welding torch 102 welds the connection part of the 1st steel pipe pile 2A and the 2nd steel pipe pile 2B is also easy, and welding quality improves.

It should be noted that the design of the present invention can be changed as appropriate without departing from the spirit of the invention.
For example, the structure of the clamp mechanism 24 is not limited to the structure shown in FIG. 4B as long as the semicylindrical members 21a and 21b can be locked to each other.
Further, the structure of the rack rail 22 is not limited to the structure shown in FIG. 4A as long as the structure can mesh with the sprocket 101 of the traveling device 10.
For example, the rack rail 22 in which an angle gear (rack) is provided around the outer peripheral surface of the body portion 21 may be used.

Further, the structure of the lifting device 122 shown in FIG. 3 is not limited. Although not shown, a structure in which the vertical position fine adjustment dial 122a is attached to the feed screw 121 above the fixed plate 121a may be employed. The feed screw 121 may rotate integrally with the vertical position fine adjustment dial 122a to move the lower body portion 122d up and down. Furthermore, the structure provided with the lock mechanism which latches rotation of the feed screw 121 and fixes the main body lower part 122d may be sufficient.
In addition, the design of the support chain 30 and the welded portion 10b of the traveling device 10 can be changed as appropriate.

1 Automatic welding equipment 2A 1st steel pipe pile (steel pipe)
2B 2nd steel pipe pile (steel pipe)
DESCRIPTION OF SYMBOLS 10 Traveling apparatus 21 Body part 21a, 21b Semi-cylindrical member 22 Rack rail 23 Hinge member 24 Clamp mechanism 30 Support chain 33 Roller member 101 Sprocket (pinion gear)
102 Welding torch 111 Motor unit (power source)
122 Lifting device (lifting mechanism)
124a First arm (back and forth movement mechanism)
124b Second arm (back and forth movement mechanism)
126c1 lateral axis (lateral movement mechanism)
126d Head rotating part (rotating mechanism)
G ground

Claims (4)

A rack rail provided around the outer peripheral surface of the steel pipe;
A traveling device that self-propels along the rack rail;
A support chain, and
An automatic welding device that forms a weld bead along the outer peripheral surface with a welding torch held by the traveling device,
The traveling device includes:
A pinion gear meshing with the rack rail;
A power source that outputs a driving force for rotating the pinion gear,
The support chain is
One end is attached to the traveling device and the other end is detachably locked to the traveling device,
With the pinion gear meshing with the rack rail, the one end to the other end is wrapped around the outer peripheral surface to attract the traveling device to the outer peripheral surface,
An automatic welding apparatus that is in contact with the outer peripheral surface via a roller member that is rotatable along the outer peripheral surface. The rack rail is
Provided in a cylindrical body part fitted on the steel pipe,
The body part is
A hinge member having a pivot shaft extending in the axial direction of the steel pipe;
Two semi-cylindrical members that are connected by the hinge member and rotate together to form a cylindrical shape;
The automatic welding apparatus according to claim 1, further comprising: a clamp mechanism that locks the semicylindrical members in a state of being combined in a cylindrical shape. The traveling device includes:
In a state of being attracted to the steel pipe by the support chain,
A lifting mechanism capable of moving the welding torch in the axial direction of the steel pipe;
A back-and-forth movement mechanism capable of moving the welding torch in a direction to approach and separate from the steel pipe;
A lateral movement mechanism capable of moving the welding torch in a direction perpendicular to the movement direction of the welding torch by the back-and-forth movement mechanism and perpendicular to the movement direction of the welding torch by the lifting mechanism;
The automatic welding according to claim 1, further comprising: a rotation mechanism capable of rotating the welding torch around a rotation axis whose axial direction is a movement direction of the welding torch by the lifting mechanism. apparatus. The steel pipe around which the rack rail is provided and the support chain is wound is a second steel pipe pile to be added to the first steel pipe pile embedded in the ground,
The welding torch is held by the traveling device so as to form the weld bead at a connection portion between the first steel pipe pile and the second steel pipe pile and to weld the first steel pipe pile and the second steel pipe pile together. The automatic welding apparatus according to any one of claims 1 to 3, wherein the automatic welding apparatus is performed.

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