JP2009220127A - Welding apparatus for inside of structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable fillet welding of an end plate and a shell of a conveyor pulley from the inside. <P>SOLUTION: A support frame 8 is arranged at a rear side of a holding part 7 for a structure to be welded which holds the conveyor pulley 1 at a posture with an axial center vertically arranged. A rod member 9 mounted with a welding torch 10 at a lower end is arranged at the front side of the support frame 8, and a downward biasing air cylinder 11, a forward biasing air cylinder 12, and an electric cylinder 13 for moving a torch tip are arranged between the upper part of the rod member 9 and the support frame 8. The rod member 9 is inserted through a hand hole 6 at the upper end plate 4a of the conveyor pulley 1. By respective air cylinders 11, 12 for downward biasing and forward biasing, the welding torch 10 on the lower end side of the rod member 9 is to be toward a fillet welding part 16 between a lower end plate 4b and the shell 5 with the hand hole 6 as a fulcrum, and by moving the upper part of the rod member 9 with the electric cylinder 13 for moving the torch tip, copy welding of a fillet welding part 16 by the welding torch 10 is carried out with the hand hole 6 as the fulcrum. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a structure internal welding apparatus used to weld a joint portion of a structure such as a joint portion of a conveyor pulley shell and an end plate from the inside.

  In general, as shown in FIG. 8, a conveyor pulley 1 used for driving or guiding a conveyor belt in a belt conveyor includes a shaft 2, a pair of left and right bosses 3 attached at predetermined positions near both ends of the shaft, The end plate 4 is attached to the outer peripheral surface of the boss 3 and the cylindrical shell 5 is attached to the outer periphery of the left and right end plates 4 and extends in the axial direction.

  Further, when manufacturing the conveyor pulley 1 having the above-described configuration, usually, first, the inner peripheral side end of the ring-shaped end plate 4 is attached to the outer peripheral surface of the boss 3 by double-sided fillet welding, The boss 3 to which the end plate 4 is attached is shrink-fitted at a predetermined location near both ends of the shaft 2. Next, after arranging the cylindrical shell 5 on the outer periphery of the pair of left and right end plates 4, each member is obtained by welding the outer peripheral end of each end plate 4 and the corresponding portion on the inner surface of the shell 5. Are integrated.

  By the way, the conveyor pulley 1 usually has a diameter of about 600 to 1200 mm, a size of about 2000 mm at the maximum, and a width in the axial direction of about 1000 to 2000 mm, and a size of about 2800 mm at the maximum. Further, since the shaft 2 passes through the center as described above, the inside of the shell 5 is very narrow. Therefore, the welded portion (joint portion) between the end plate 4 and the shell 5 cannot be welded by a person entering the inside of the conveyor pulley 1, so one-sided welding from the outside of the conveyor pulley 1 is impossible. Need to do.

  Therefore, when performing a welding operation between the end plate 4 and the shell 5, a welding method widely known as a tape backing method in a state where each end plate 4 and the shell 5 are temporarily attached, specifically, A glass fiber tape (not shown) is inserted from a hand hole 6 having a diameter of about 100 mm provided at a required location of the end plate 4, and the glass fiber tape is welded to the outer peripheral end of the end plate 4 and the shell 5. In the state where it is arranged as a backing material (backing material) on the inner side, the outer edge of the end plate 4 and the shell 5 are subjected to a single groove welding from the outside so as to make the back end shape smooth. is doing.

  In addition to the tape backing method described above, the method of performing the single groove welding is that a welding wire is exposed to the single groove welded portion between the base metals, and the base metal contacts each other by an arc of the welding wire. There has also been proposed a welding technique in which the contact portion is melted, and at this time, the melt is pushed out to the opposite side of the weld side by controlling the welding current and the welding voltage to form a back bead (for example, patents) Reference 1).

JP 2002-239723 A

  However, in the one-bevel welding method of the end plate 4 and the shell 5 of the conveyor pulley 1 by the tape backing method, the glass fiber tape for tape backing must be attached from the hand hole 6 provided in the end plate 4. Since it is necessary to insert the hand mirror from the hand hole 6 of the end plate 4 to visually check the tape mounting state, it takes a lot of time and effort. The fact is that the working time is increased.

  In addition, the conventional single-groove welding method tends to cause uneven finish even by skilled engineers, and the finish varies depending on the welding skill and the accuracy of the roundness of the shell. There is a need to.

  In addition, according to the method of the single groove welding described in Patent Document 1, the molten material is welded to the welding side while melting the contact portion between the base materials at the single groove welded portion between the base materials. It is said that a back bead can be formed by extruding to the opposite side, but in order to construct a weld with a uniform back bead formed by extruding the melt on the opposite side to the weld side However, there is a problem that it requires very advanced technology and know-how and cannot be realized easily.

  Therefore, the present invention is intended to perform internal fillet welding with a uniform finish from the inside without relying on skills and know-how for the joint portion of the structure such as the joint portion of the end plate and the shell in the conveyor pulley. It is an object of the present invention to provide a structure internal welding apparatus capable of performing the above-mentioned.

  In order to solve the above-mentioned problems, the present invention, corresponding to claim 1, is arranged on the front side of the support frame a rod member extending in the vertical direction and having a welding torch attached to the lower end side, A lower urging means for urging the rod member downward between the upper part and the support frame, a front urging means for urging the upper part of the rod member forward, and an upper part of the rod member are substantially omitted. Comprising a torch tip moving means for moving in the left-right direction, inserting the rod member from a hand hole provided in a plate located on the upper surface side of the structure to be welded arranged on the front side of the support frame, By urging the upper part of the rod member downward and forward by the lower urging means and the front urging means, the welding torch on the lower end side of the rod member is supported on the lower surface side of the structure to be welded with the hand hole as a fulcrum. The plate located at the rear The state is pressed against the fillet weld between the side plate and the torch tip moving means, and the upper part of the rod member is moved in the left-right direction by the torch tip moving means, so that the welding torch is moved to the lower surface side of the structure to be welded. The fillet welded portion can be copied and welded from the inside of the structure to be welded while moving along the fillet welded portion between the plate located and the side plate located at the rear.

  Further, in the above configuration, a plate located on the lower surface side of the structure to be welded, a bottom copying member for contacting the side plate located on the rear portion, and a side copying member are provided in the vicinity of the tip of the welding torch. The configuration is as follows.

  Further, in each of the above configurations, the structure to be welded is a conveyor pulley having a posture in which the axial center direction is arranged in the vertical direction, and a plate positioned on the lower surface side of the structure to be welded is positioned below the conveyor pulley. A side plate located at the rear part of the structure to be welded is used as a shell located at the rear part of the conveyor pulley, and between the inner surface of the end plate located below the conveyor pulley and the inner peripheral surface of the shell. The fillet welded portion is configured to be able to follow and weld from the inside of the conveyor pulley by a welding torch on the lower end side of the rod member.

According to the structure internal welding apparatus of the present invention, the following excellent effects are exhibited.
(1) A rod member extending in the vertical direction and having a welding torch attached to the lower end side is disposed on the front side of the support frame, and the rod member is urged downward between the upper portion of the rod member and the support frame. A downward urging means, a forward urging means for urging the upper part of the rod member forward, and a torch tip moving means for moving the upper part of the rod member substantially in the left-right direction, The rod member is inserted from a hand hole provided in a plate located on the upper surface side of the structure to be welded arranged on the front side of the support frame, and the upper portion of the rod member is lowered by the lower urging means and the front urging means. The welding torch on the lower end side of the rod member with the hand hole as a fulcrum is biased forward, and the fillet between the plate located on the lower surface side of the structure to be welded and the side plate located at the rear part Pressed against the weld The upper part of the rod member is moved in the left-right direction by the torch tip moving means, and the fillet between the plate located on the lower surface side of the structure to be welded and the side plate located at the rear is moved. Since the fillet welded portion is configured to be copied and welded from the inside of the structure to be welded while moving along the welded portion, the structure to be welded has a plate located on the upper surface side thereof, Only by providing a hand hole for inserting the rod member and the welding torch on the lower end side thereof, from the inside of the structure to be welded, a plate located on the lower surface side of the structure to be welded and a side plate located on the rear part The intermediate fillet welds can be copied and welded. Therefore, by sequentially changing the orientation and position of the welding target structure, the fillet welded portion between the plate located on the lower surface side of the welding target structure and the side plate located on the rear part is completely removed. It is possible to copy and weld over the circumference. In addition, since the welding operation can be automated, it is possible to perform internal fillet welding with stable quality without relying on skills and know-how on the structure to be welded. Therefore, it is possible to make the strength, quality, reliability, and the like of the structure to be welded uniform. Furthermore, since it becomes possible to fillet weld the joint between the plate located on the lower surface side in the structure to be welded and the side plate located at the rear from both the inside and outside, the strength of the joint can be increased. Moreover, the effect that it becomes possible to achieve weight reduction of the product of the said structure for welding is also expectable.
(2) A structure in which a plate located on the lower surface side of the structure to be welded, a bottom surface copying member for contacting the side plate positioned on the rear portion, and a side surface copying member are provided in the vicinity of the front end portion of the welding torch. By doing so, the bottom copying member and the side copying member of the welding torch can surely cause the welding torch to move following the plate positioned on the lower surface side of the structure to be welded and the side plate positioned at the rear. it can.
(3) The structure to be welded is a conveyor pulley having a posture in which the axial center direction is arranged in the vertical direction, and the plate positioned on the lower surface side of the structure to be welded is a mirror plate positioned below the conveyor pulley. The fillet weld between the inner surface of the end plate located on the lower side of the conveyor pulley and the inner peripheral surface of the shell, with the side plate located at the rear of the structure to be welded being a shell located at the rear of the conveyor pulley Is constructed so that it can be copied and welded from the inside of the conveyor pulley by means of a welding torch on the lower end side of the rod member, so that the end plate and shell of the conveyor pulley can be fillet welded from the inside, and the end plate Copy welding along the circumferential curvature of the fillet weld between the shell and the shell can be performed. Therefore, the strength, quality, and reliability of the conveyor pulley as a product can be made uniform, and an effect of reducing the failure of the belt conveyor using the conveyor pulley can be expected. Furthermore, since it is possible to increase the strength of the joint between the end plate of the conveyor pulley and the shell, which has conventionally only been able to perform single groove welding from the outside, when the same strength as conventional is required, It is possible to reduce the weight of the conveyor pulley, and therefore, a cost reduction effect can be expected.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG. 1 to FIG. 6 show an embodiment of the structure internal welding apparatus of the present invention, in which a conveyor pulley 1 similar to that shown in FIG. In the posture, an application example in the case where the joint portion between the end plate 4 of the conveyor pulley 1 and the shell 5 disposed on the outer periphery thereof is fillet welded from the inside is shown as follows.

  That is, a support frame 8 that extends in the vertical direction is provided as a fixed part at a position on the back side of the structure to be welded 7 that can hold the conveyor pulley 1 in a posture in which the axial direction is arranged vertically. On the front side of the support frame 8, the welding torch 10 is attached to the lower end portion extending in the vertical direction with a dimension longer than the axial dimension of the shell 5 of the conveyor pulley 1, which is a structure to be welded. The rod member 9 is disposed. Between the upper end side of the rod member 9 and the support frame 8, a lower biasing means 11 configured to bias the rod member 9 downward, and an upper end side of the rod member 9 The front biasing means 12 is configured to be able to bias substantially forward in the horizontal plane, and the upper end side of the rod member 9 is moved in the substantially horizontal direction in the horizontal plane, via the rod member 9. The torch tip moving means 13 for moving the torch aiming position of the welding torch 10 attached to the lower end portion thereof is provided.

  Further, the welding torch 10 attached to the lower end portion of the rod member 9 is configured such that the target position of the torch is inclined at a required angle rearward with respect to the axial direction of the rod member 9, and the outer peripheral portion in the vicinity of the distal end of the welding torch 10. Further, a bottom tracing wheel 14 as a bottom tracing member that projects a required dimension downward from the torch aiming direction of the welding torch 10, for example, about 45 degrees downward, and a rearward angle from the torch aiming direction, for example, The side surface copying wheel 15 is provided as a side surface copying member that protrudes about 45 degrees rearward by a required dimension. Accordingly, the welding object holding portion 7 is positioned at the rearmost position among the hand holes 6 provided in the end plate 4a positioned on the upper side of the conveyor pulley 1 held in a posture in which the axial center direction is arranged in the vertical direction. The rod member 9 is inserted from above through the hand hole 6 and the rod member 9 is urged downward by the downward urging means 11 to be provided on the welding torch 10 on the lower end side of the rod member 9. A bottom copying wheel 14 is pressed from above onto the inner surface of the end plate 4b located on the lower side of the conveyor pulley 1, and the front urging means 12 causes a hand hole in the end plate 4a located on the upper side of the conveyor pulley 1. By urging the upper end side of the rod member 9 projecting upward from 6 in the horizontal plane, the welding toe on the lower end side of the rod member 9 is supported with the hand hole 6 as a fulcrum. 10 is pressed against the inner peripheral surface of the portion of the conveyor pulley 1 located near the rear portion of the shell 5 from the inside, so that the space between the copying wheels 14 and 15 is increased. Thus, fillet welding between the inner surface of the end plate 4b located on the lower side of the conveyor pulley 1 and the inner peripheral surface of the portion located closer to the rear of the shell 5 is performed in the direction to which the welding torch 10 is aimed. The arrangement can be made to face the portion 16.

  Further, as described above, the bottom copying wheel 14 is positioned on the inner surface of the end plate 4b positioned below the conveyor pulley 1, and the side copying wheel 15 is positioned near the rear portion of the shell 5 of the conveyor pulley 1. By moving the upper end side of the rod member 9 substantially horizontally in the horizontal plane, for example, from right to left, by the torch tip moving means 13 while being pressed against the inner peripheral surface of the portion being Using the hand hole 6 of the upper end plate 4a as a fulcrum, the welding torch 10 on the lower end side of the rod member 9 is connected to the inner surface of the lower end plate 4b and the portion located at the rear of the shell 5. The fillet welding of the fillet welded portion 16 can be performed by moving the fillet welded portion 16 from the left to the right while following the curvature in the circumferential direction of the fillet welded portion 16 with the inner peripheral surface.

  Details will be described below.

  On the front side of the support frame 8 is attached a lifting frame 17 that can be moved in the vertical direction by a lifting drive mechanism (not shown). The elevating frame 17 has a height from an end plate 4b positioned below the conveyor pulley 1 disposed on the welding target structure holding portion 7 in a posture in which the axial direction is set to the up-down direction to an end plate 4a positioned above. It shall be possible to move up and down with a stroke exceeding the dimensions.

  A rear end portion of a horizontal frame 18 projecting forward in the required dimension is attached to a lower position of the front surface of the elevating frame 17 so as to be displaceable with a required short stroke in the vertical direction along a guide (not shown). Further, as the lower urging means 11, for example, a lower urging air cylinder 11 is arranged in the vertical direction on the front side of the central portion in the width direction of the elevating frame 17. The end on the upper end side is fixed to a corresponding portion on the upper front surface of the lifting frame 17, and the end on the lower end side of the lower urging air cylinder 11 corresponds to the upper surface of the rear end portion of the horizontal frame 18. It is the structure attached to the place to do.

  At a position directly behind the axial center position of the conveyor pulley 1 disposed on the welding object structure holding portion 7 on the lower surface of the horizontal frame 18, a guide 20 extending in the front-rear direction and a driving mechanism (not shown) The guide 20 of the rod front / rear position adjusting device 19 provided with a slider 21 that can freely move in the front / rear direction along the lower side of the guide 20 is attached.

  Below the rod front / rear position adjusting device 19, for example, a front urging air cylinder 12 is disposed forward as the front urging means 12, and a base end portion of the front urging air cylinder 12 is provided. The rod front / rear position adjusting device 19 is attached to the lower side of the slider 21 so as to be swingable in the left-right direction. Further, the upper end portion of the rod member 9 is connected to the front end portion of the operating rod 12a of the forward urging air cylinder 12 so as to be swingable in the front-rear direction.

  At the left or right end of the horizontal frame 18, for example, the left end, in the vertical direction at a position away from the axial center position of the conveyor pulley 1 disposed in the welding target structure holding portion 7 in the left-right direction. The upper end of the side frame 22 extending in the required dimension is integrally attached.

  At the height position corresponding to the required position near the upper end of the rod member 9 in the side frame 22, as the torch tip moving means 13, for example, the base end portion of the electric cylinder 13 for torch tip moving is front and rear and It is attached so that the angle can be changed in the vertical direction. Further, the tip of the operating rod 13 a of the electric cylinder 13 for moving the torch tip is connected to a required portion near the upper end of the rod member 9 via a spherical bearing 23. As a result, the upper end side of the rod member 9 is opposed to the front urging air cylinder 12 with respect to the horizontal frame 18 attached to the support frame 8 via the elevating frame 17 and the downward urging air cylinder 11. The rod front / rear position adjusting device 19 and the spherical bearing 23, the torch tip moving electric cylinder 13 and the side frame 22 are held in a suspended state.

  Further, as described above, the rod member 9 is connected to the horizontal frame 18 with the forward urging air cylinder 12, the rod front / rear position adjusting device 19, the spherical bearing 23 and the torch tip moving electric cylinder 13. Since the rod frame 9 is suspended through the side frames 22, the rod member 9 can be operated regardless of which of the rod front / rear position adjusting device 19, the forward biasing air cylinder 12, and the torch tip moving electric cylinder 13. Is kept substantially vertical due to its own weight and the weight of the welding torch 10 at the lower end thereof. Therefore, when the welding torch 10 is inserted into the hand hole 6 of the end plate 4a located on the upper side of the conveyor pulley 1 that is held by the structure holding portion 7 to be welded in a posture in which the axial center direction is the vertical direction, The angular posture of the torch 10 cannot be changed. In view of the above points, the cylindrical member 24 loosely fitted on the outer periphery of the upper required position away from the upper end of the rod member 9 can be freed during the welding operation. Thus, the auxiliary positioning mechanism 25 formed by combining the left-right actuator 26 and the front-rear actuator 27 is connected. The actuators 26 and 27 of the auxiliary positioning mechanism 25 may be supported on the lower surface side of the horizontal frame 18 or the inner side of the side frame 22 via a support member (not shown). Thereby, the hand hole of the end plate 4a located above the conveyor pulley 1 in which the welding torch 10 on the lower end side of the rod member 9 is held by the structure to be welded 7 in a posture in which the axial direction is the vertical direction. When the rod member 9 is inserted into or pulled out from the hand hole 6, the angle of the rod member 9 is changed by appropriately operating the left and right and front and rear actuators 26 and 27 of the auxiliary positioning mechanism 25. Thus, the angular attitude of the welding torch 10 on the lower end side of the rod member 9 can be adjusted.

  Even if the welding object holding part 7 is the conveyor pulley 1 having a different diameter, the support frame 8 is arranged so that the distance between the rearmost part of the shell 5 of the conveyor pulley 1 and the support frame 8 is substantially constant. It is assumed that the position for holding the shaft 2 of the conveyor pulley 1 can be moved in the front-rear direction according to the diameter of the conveyor pulley 1 to be welded.

  By the way, as described above, the lower part of the rod member 9 is inserted from the hand hole 6 of the end plate 4a located on the upper side of the conveyor pulley 1 which is held in the posture in which the axial center direction is arranged vertically in the welding object holding part 7. In this state, the torch tip moving electric cylinder 13 is expanded and contracted, whereby the welding torch 10 on the lower end side of the rod member 9 is moved to the inner surface of the end plate 4b positioned below the conveyor pulley 1 and the shell 5 inside. The angular range that can move in the circumferential direction along the fillet weld 16 with the peripheral surface is positioned above the conveyor pulley 1 in the longitudinal direction of the rod member 9 and the operating stroke of the electric cylinder 13 for moving the torch tip. The distance from the position serving as the fulcrum of the operation of the rod member 9 by contacting the hand hole 6 of the end plate 4a to the welding torch 10 on the lower end side of the rod member 9 and the position serving as the fulcrum Varies with the ratio of the distance to a position in which a spherical bearing 23 that connects the operating rod 13a of the torch destination mobile electric cylinder 13. Therefore, if the operation stroke of the electric cylinder 13 for moving the torch tip is expanded, the range of movement angle in the circumferential direction along the fillet welded portion 16 of the welding torch 10 due to the expansion / contraction operation of the electric cylinder 13 for moving the torch tip is increased. However, when the inclination of the rod member 9 is increased, the angle deviation from the fillet welded portion 16 in the direction of the torch aiming of the welding torch 10 on the lower end side of the rod member 9 is increased, so that the welding quality is improved. There is concern about the possibility of an effect. Accordingly, in view of the above points, the welding torch 10 on the lower end side of the rod member 9 is moved below the conveyor pulley 1 by moving the torch tip moving electric cylinder 13 to extend and contract, and the shell 5. The angular range of movement in the circumferential direction along the fillet weld 16 is set to 60 degrees or 120 degrees, for example. Therefore, the end plate 4a, 4b of the conveyor pulley 1 has the welding torch 10 on the lower end side of the rod member 9 along the fillet weld portion 16 by one expansion / contraction operation of the electric cylinder 13 for moving the torch tip. What is necessary is just to provide the hand hole 6 by the circumferential direction angular interval corresponding to the circumferential direction angular range which can be moved.

  From the viewpoint of reducing the size, the welding torch 10 is preferably a welding torch 10 for MIG welding or MAG welding using the welding wire 28 as an electrode. If the welding torch 10 is small enough to pass through the hand hole 6 to be provided, other types of welding torches such as TIG welding or laser welding may be adopted.

  Supply of the welding wire 28 and shield gas to the welding torch 10 makes the rod member 9 hollow and does not become lower than the end plate 4 a located above the conveyor pulley 1 above the rod member 9. It is assumed that an opening (not shown) is provided on the side surface of the position so that the opening can be performed through the inside of the rod member 9 from the opening.

  The other components that are the same as those shown in FIG.

  When using the structure internal welding apparatus having the above-described configuration, the lifting frame 17 is raised in advance along the support frame 8 and is suspended from the horizontal frame 18 attached to the front side of the lifting frame 17. The welding torch 10 on the lower end side of the rod member 9 is retracted to a position above the shell 5 of the conveyor pulley 1 that is scheduled to be arranged in the vertical orientation of the axial center direction on the structure holding portion 7 to be welded. In this state, the conveyor pulley 1 in which the shell 5 is temporarily attached to the outer periphery of each end plate 4a, 4b by spot welding or the like is disposed on the welding target structure holding portion 7 in a posture in which the axial direction is set to the vertical direction. At this time, one of the six hand holes 6 provided in the end plate 4a located above the conveyor pulley 1 at a required interval in the circumferential direction, for example, at an interval of 60 degrees in the circumferential direction, is closest to the support frame 8. Keep it in the position.

  Next, the slider 21 of the rod front / rear position adjusting device 19 is moved in the front / rear direction, so that the rod member 9 is located at the rearmost end of the end plate 4a located above the conveyor pulley 1 disposed in the welded structure holding portion 7. In the state where the auxiliary positioning mechanism 25 is disposed so as to be suspended above the hand hole 6 positioned at the position, the actuators 26 and 27 in the left-right direction and the front-rear direction of the auxiliary positioning mechanism 25 are appropriately operated to weld the lower end of the rod member 9 While adjusting the angular posture of the torch 10, the elevating frame 17 is lowered to the hand hole 6 located at the rear end of the end plate 4 a located on the upper side of the conveyor pulley 1 disposed on the welding target structure holding portion 7. The rod member 9 is inserted from the lower end side to which the welding torch 10 is attached.

  Next, when the lifting frame 17 is brought into contact with the inner surface of the end plate 4b located on the lower side of the conveyor pulley 1 by the bottom tracing wheel 14 provided on the welding torch 10 on the lower end side of the rod member 9, the rod After lowering the member 9 to a height position where the lowering of the member 9 stops, the elevating frame 17 is further lowered to a position having a lower required dimension, whereby the bottom tracing wheel of the welding torch 10 is interposed via the rod member 9. 14, a downward urging force by the lower urging air cylinder 11 attached to the upper side of the horizontal frame 18, that is, a pressing force to the inner surface of the end plate 4b located on the lower side of the conveyor pulley 1 acts. To do.

  Further, in this state, after the operations of the actuators 26 and 27 in the left and right and front and rear directions of the auxiliary positioning mechanism 25 are made free, as shown in FIG. 5 (b) and FIG. 6 to be described later), the front urging air cylinder 12 is extended to urge the upper end of the rod member 9 forward, For side copying provided on the welding torch 10 on the lower end side of the rod member 9 with the hand hole 6 located at the rear end of the end plate 4a located on the upper side of the conveyor pulley 1 through which the rod member 9 is inserted as a fulcrum. The wheel 15 is pressed from the inner side to the inner peripheral surface of the portion of the conveyor pulley 1 located near the rear portion of the shell 5. Furthermore, the electric cylinder 13 for moving the torch tip is operated to extend so that the upper end side of the rod member 9 is arranged on the right side in the figure with respect to the hand hole 6 of the end plate 4a located on the upper side. , The welding torch 10 on the lower end side of the rod member 9 is a corner between the inner surface of the end plate 4b located on the lower side of the conveyor pulley 1 and the inner peripheral surface of the portion located on the rear part of the shell 5. It arrange | positions facing the required dimension left side position rather than the hand hole 6 used as the fulcrum of the operation | movement of the said rod member 9 in the meat weld part 16. FIG.

  Thereafter, the supply of the welding wire 28 to the welding torch 10 is started, and the welding operation by the welding torch 10 is started. Then, the contraction operation of the electric cylinder 13 for moving the torch tip is started and the rod member 9 is started. When the upper end side is gradually moved from the right side to the left side, the bottom urging air cylinder 11 causes the bottom tracing wheel 14 to be applied to the inner surface of the end plate 4b positioned below the conveyor pulley 1 or for the front urging. The welding torch 10 is gradually moved from the left side to the right side while the side copying wheel 15 is pressed against the inner peripheral surface of the portion located near the rear portion of the shell 5 by the air cylinder 12. The fillet welding of the fillet weld portion 16 between the inner surface of the end plate 4b located on the lower side of the conveyor pulley 1 and the inner peripheral surface of the portion located near the rear portion of the shell 5, It will be started as the direction of the copying welding.

  After starting fillet welding of the fillet welded portion 16 between the end plate 4b located below the conveyor pulley 1 and the shell 5 as described above, the torch tip as shown in FIG. When the electric cylinder 13 for movement is contracted, fillet welding of the fillet weld portion 16 between the inner surface of the end plate 4b located on the lower side of the conveyor pulley 1 and the inner peripheral surface of the shell 5 is required in the circumferential direction. It is carried out in the angle range. In addition, the arrow A shown in the drawing is the locus of the upper end portion of the rod member 9, and the arrow B shows the locus of the place where the fillet welding is performed by the welding torch 10 accompanying the movement of the upper end portion of the rod member 9. Yes.

  Thereafter, after temporarily interrupting the welding operation, the actuator 26 and 27 in the left and right direction and the front and rear direction of the auxiliary positioning mechanism 25 are operated to adjust the angular posture of the welding torch 10 on the lower end side of the rod member 9, The elevating frame 17 is raised, and the rod member 9 and the welding torch 10 are once pulled out from the conveyor pulley 1, and in this state, the conveyor pulley 1 is centered on an axis at a required angle, specifically, the corner. Rotate the angle corresponding to the angle range in which the meat welding was performed, and arrange another hand hole 6 of the end plate 4a located on the upper side of the conveyor pulley 1 at the rear, and in this state, perform the same procedure as above. By repeating, fillet welding by circumferential copy welding of the fillet weld portion 16 between the inner surface of the end plate 4b located below the conveyor pulley 1 and the inner peripheral surface of the shell 5 is performed in the circumferential direction. It is carried out over a necessary angle range, and the same procedure is further repeated in order, so that the fillet weld 16 between the inner surface of the end plate 4b located on the lower side of the conveyor pulley 1 and the inner peripheral surface of the shell 5 is obtained. By sequentially connecting the fillet welding for each required angle range, the fillet welded portion 16 is welded from the inside over the entire circumference in the circumferential direction.

  Thereafter, the end plate 4b located on the lower side of the conveyor pulley 1 where the fillet welding operation from the inside of the fillet weld portion 16 between the shell 5 and the shell 5 is completed becomes a new upper end plate 4a, and The conveyor pulley 1 is inverted in the vertical direction so that the end plate 4a located on the upper side of the conveyor pulley 1 that has not yet undergone fillet welding with the shell 5 becomes a new lower end plate 4b. Thereafter, the same procedure as described above is repeated, so that the end plate 4b newly disposed on the lower side of the conveyor pulley 1 is also copied and welded from the inside of the fillet weld 16 between the shell 5 and the above. After that, the end plates 4 (4a, 4b) and the shell 5 are also welded from the outside between the end plates 4 (4a, 4b) and the shell 5, so that the end plates 4 (4a, 4b) and the shell 5 are double-sided fillets. As a welded conveyor pulley 1 is produced It made.

  Further, for a conveyor pulley 1 having a different diameter, for example, a conveyor pulley 1 having a larger diameter and a longer distance between the hand hole 6 provided in the end plates 4a and 4b and the shell 5, the end plates 4 (4a and 4b) When the fillet welding is performed from the inside of the fillet weld 16 between the shell 5 and the shell 5, as shown in FIG. 6, the rearmost part of the shell 5 of the conveyor pulley 1 having a larger diameter and the support frame 8 Is larger than the distance between the rearmost portion of the shell 5 of the conveyor pulley 1 and the support frame 8 shown in FIGS. Are arranged in the welding object holding portion 7 in a posture in which the axial center direction is the vertical direction with the axial center position shifted further forward. Next, by moving the slider 21 of the rod front / rear position adjusting device 19 forward, the rod member 9 is previously provided in the hand hole 6 provided in the end plate 4a located above the conveyor pulley 1 having a larger diameter. The hand is provided on the end plate 4a located above the conveyor pulley 1 having a larger diameter in the same manner as described above, and then suspended by the upper position of the rearmost hand hole 6. The rod member 9 is inserted into the hand hole 6 located at the rear end of the hole 6 from the lower end side to which the welding torch 10 is attached, and the end plate located below the conveyor pulley 1 having a larger diameter. Fillet welding from the inside of the fillet weld 16 between the inner surface of 4b and the inner peripheral surface of the shell 5 may be performed.

  Thus, according to the structure internal welding apparatus of this invention, between each end plate 4 (4a, 4b) and the shell 5 of the said conveyor pulley 1 can be welded from the inside, and each end plate 4 Copy welding along the circumferential curvature of the fillet weld portion 16 between (4a, 4b) and the shell 5 can be performed. Moreover, since the welding operation itself can be automated, it is possible to perform internal fillet welding with stable quality without depending on skills and know-how. Therefore, the strength, quality, and reliability of the conveyor pulley 1 as a product can be made uniform, and an effect of reducing failure of the belt conveyor using the conveyor pulley 1 can be expected.

  Furthermore, since the strength of the joint portion between the end plate 4 (4a, 4b) of the conveyor pulley 1 and the shell 5 that could conventionally be welded only from the outside can be increased, the same strength as before is required. In this case, the weight of the conveyor pulley 1 as a product can be reduced.

  Furthermore, a cost reduction effect can be expected by reducing the weight of the conveyor pulley 1 as a product and automating the welding operation.

  Next, FIGS. 7A and 7B show application examples of the embodiment of FIGS. 1 to 6 as another embodiment of the present invention, and have the same configuration as shown in FIGS. , In the state where the rod member 9 is inserted from above into the rear hand hole 6 of the end plate 4a located on the upper side of the conveyor pulley 1 held by the welding object holding portion 7, A fulcrum restraining member 29 is provided for fitting in the hole 6 so that the fulcrum of the operation of the rod member 9 can be restrained.

  Specifically, the fulcrum restraining member 29 has a short cylindrical shape having an inner diameter slightly larger than the outer diameter of the rod member 9, and an intermediate portion of the inner peripheral surface in the axial direction is formed on the rod member 9. The inner diameter is slightly larger than the outer diameter, and the diameter of the inner peripheral surface is increased smoothly from the center portion in the axial direction toward both ends in the vertical direction. Thus, while the rod member 9 is inserted inside the fulcrum restraining member 29, the rod member 9 is restrained from being displaced in the horizontal direction, while the rod members 9 on both upper and lower sides of the fulcrum restraining member 29 are suppressed. The conical movement is allowed to be acceptable.

  Further, the fulcrum restraining member 29 has an outer diameter of the upper half portion which is larger than the outer diameter of the hand hole 6 of the end plate 4a, 4b of the conveyor pulley 1 and an outer diameter of the lower half portion of the conveyor pulley 1 described above. The dimensions are almost the same as or slightly smaller than the inner diameter of the hand holes 6 of the end plates 4a and 4b of the conveyor pulley 1. Further, the fulcrum restraining member 29 has a split structure composed of two segments that are split into two at positions facing each other by 180 degrees in the circumferential direction. As a result, the fulcrum restraining member 29 is combined in a ring shape on the outer periphery of the rod member 9 in a state where the divided segments are inserted into the hand holes 6 of the end plates 4a and 4b of the conveyor pulley 1, and then the hand holes 6 can be inserted into the hand hole 6 by being inserted from the lower end side.

  According to the present embodiment, as shown in FIGS. 5 (a) and 5 (b), the bottom tracing air wheel 14 of the welding torch 10 is positioned on the lower side of the conveyor pulley 1 by the downward biasing air cylinder 11. End plate positioned on the upper side of the conveyor pulley 1 through which the rod member 9 is inserted by pressing the upper end portion of the rod member 9 forward by the air cylinder 12 for pressing against the inner surface of 4b and the front biasing air cylinder 12. The side surface copying wheel 15 provided on the welding torch 10 on the lower end side of the rod member 9 is positioned closer to the rear part of the shell 5 of the conveyor pulley 1 with the hand hole 6 positioned at the rear end of 4a as a fulcrum. After pressing against the inner peripheral surface of the portion from the inside, the torch tip moving electric cylinder 13 is expanded and contracted, and the upper end side of the rod member 9 is supported by the rearmost hand hole 6 of the end plate 4a located on the upper side. As The welding torch 10 on the lower end side of the rod member 9 is connected to the fillet welded portion 16 between the inner surface of the end plate 4b located on the lower side of the conveyor pulley 1 and the inner peripheral surface of the portion located on the rear portion of the shell 5. The horizontal displacement of the rod member 9 inside the rearmost hand hole 6 of the end plate 4a located on the upper side of the conveyor pulley 1 serving as a fulcrum of the movement of the rod member 9 when moving along the rod Can be restrained by the fulcrum restraining member 29 attached to the hand hole 6, so that the electric cylinder 13 for moving the torch tip is extended along the fillet welded portion 16 of the welding torch 10 on the lower end side of the rod member 9 during the expansion / contraction operation. The movement can be performed more smoothly. Therefore, the effect which improves the welding quality of the said fillet weld part 16 can be anticipated.

  The present invention is not limited to the above embodiment, and the lower urging means, the front urging means, and the torch tip moving means use any power of electric, air pressure, and hydraulic pressure, respectively. Also good.

  Further, if the lower biasing means, the forward biasing means and the torch tip moving means of the rod member 9 are provided between the upper portion of the rod member 9 and the fixed portion, the support frame 8, the lifting frame 17, the horizontal frame 18, The shape and arrangement of the side frame 22 may be changed as appropriate. Further, the lifting frame 17 may be omitted if the welding target structure holding unit 7 has a function of lifting the conveyor pulley 1 as the welding target structure.

  If the bottom copying member and the side copying member provided on the welding torch 10 can be moved along the inner surface of the end plate 4b located on the lower side of the conveyor pulley 1 and the inner peripheral surface of the shell 5, respectively. A configuration other than the bottom copying wheel 14 and the side copying wheel 15 may be adopted.

  Of course, various modifications can be made without departing from the scope of the present invention.

It is a partial cutting schematic perspective view which shows one Embodiment of the structure internal welding apparatus of this invention. It is a figure which expands and shows the upper part side of the rod member in FIG. FIG. 2 is a cut-away schematic side view of the apparatus of FIG. 1. It is a side view which expands and shows the lower end part of the rod member of the apparatus of FIG. FIG. 1 shows a procedure of fillet welding performed using the apparatus of FIG. 1, wherein (a) shows a state in which a welding torch is arranged toward a welding start point in a fillet welded portion between a mirror plate and a shell of a conveyor pulley. (B) is a partially cut schematic plan view showing a state in which copy welding is performed along the circumferential direction of the fillet weld. FIG. 2 is a partially cut schematic plan view showing a state in which a fillet welded portion between a mirror plate and a shell of the conveyor pulley is welded to a conveyor pulley having a different diameter using the apparatus of FIG. 1. As other forms of implementation of this invention, the principal part of the application example of the apparatus of FIG. 1 is shown, (A) is a schematic cut | disconnection side view, (B) is a schematic plan view. It is a partially cut schematic perspective view which shows the general structure of a conveyor pulley.

Explanation of symbols

1 Conveyor pulley (structure to be welded)
4a, 4b End plate (plate)
5 Shell (side plate)
6 Hand hole 8 Support frame 9 Rod member 10 Welding torch 11 Air cylinder for downward biasing (downward biasing means)
12 Air cylinder for forward urging (forward urging means)
13 Electric cylinder for torch tip movement (torch tip moving means)
14 Bottom copying wheel (bottom copying member)
15 Side copying wheel (side copying member)
16 Fillet weld

Claims (3)

  A rod member extending in the vertical direction and having a welding torch attached to the lower end side is disposed on the front side of the support frame, and the rod member is biased downward between the upper portion of the rod member and the support frame. A lower urging means, a front urging means for urging the upper part of the rod member forward, and a torch tip moving means for moving the upper part of the rod member substantially in the left-right direction. The rod member is inserted from a hand hole provided in a plate located on the upper surface side of the structure to be welded arranged on the front side, and the upper portion of the rod member is moved downward and forward by the lower urging means and the front urging means. By energizing the welding torch on the lower end side of the rod member with the hand hole as a fulcrum, to the fillet weld between the plate located on the lower surface side of the structure to be welded and the side plate located on the rear part Press and hold The upper part of the rod member is moved in the left-right direction by the torch tip moving means, and the fillet welded portion between the plate located on the lower surface side of the structure to be welded and the side plate located at the rear part A structure internal welding apparatus having a configuration in which the fillet weld portion can be copied and welded from the inside of the structure to be welded while being moved following the above.   2. A plate according to claim 1, wherein a plate located on the lower surface side of the structure to be welded, a bottom surface copying member for contacting the side plate positioned at the rear portion, and a side surface copying member are provided in the vicinity of the tip of the welding torch. Structure internal welding equipment.   The structure to be welded is a conveyor pulley in a posture in which the axial direction is arranged in the vertical direction, and the plate located on the lower surface side of the structure to be welded is a mirror plate located below the conveyor pulley, and the object to be welded The side plate located at the rear of the structure is used as the shell located at the rear of the conveyor pulley, and the fillet weld between the inner surface of the end plate located at the lower side of the conveyor pulley and the inner peripheral surface of the shell is 3. The structure internal welding apparatus according to claim 1, wherein the welding is performed from the inside of the conveyor pulley by means of a welding torch on the lower end side of the member.

Images