JP2018069329A - Welding device of concrete-reinforcing reinforcement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To propose a welding device of a concrete-reinforcing reinforcement capable of stably welding a stirrup reinforcement and a vertical reinforcement of a deformed cross section in a desired form.SOLUTION: A welding device comprises a clamp device 41 for sandwiching a horizontal reinforcement part 103 of a stirrup reinforcement 102 from the front-rear and a pitch feeding device for positionally converting the clamp device 41 into a first position F and a second position G, and the stirrup reinforcement 102 is held in a welding position P by sandwiching the horizontal reinforcement part 103 by the clamp device 41 in the first position F, and the stirrup reinforcement 102 and a vertical reinforcement 101 are put in a separate position T by forward moving the clamp device 41 ro the second position G after welding, and since the clamp device 41 is moved backward to the first position F after releasing sandwiching in the second position G, when welding, the stirrup reinforcement 102 can be accurately and stably held in a predetermined position and an attitude, and a concrete-reinforcing reinforcement of a desired form can be stably manufactured.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a welding apparatus for a reinforcing steel bar for concrete reinforcement, which is used for manufacturing a reinforcing steel bar constituting a reinforced concrete and welds a vertical bar and a stirrup bar of the reinforcing steel bar.

  Generally, concrete reinforced with reinforcement (hereinafter referred to as reinforced concrete) is used for the concrete structure of a building. Such reinforcing steel bars are manufactured by welding long vertical bars along the longitudinal direction of the concrete structure and stirrup bars arranged substantially orthogonal to the vertical bars. The reinforcing steel bars are formed by welding a plurality of stirrup bars at predetermined intervals in the longitudinal direction of the vertical bars. Here, the stirrup streaks are short rod-shaped (so-called horizontal streaks), bent into L-shapes or U-shapes (so-called non-closed shapes), folded into triangles or quadrangles. A thing (what is called a closed shape) etc. are used.

  As an apparatus for welding the above-described vertical bars and stirrup bars, for example, the configuration of Patent Document 1 has been proposed. This patent document 1 is a welding apparatus for sequentially welding U-shaped or other non-closed stirrup bars to vertical bars at predetermined intervals. More specifically, the stirrup bar is held in contact with the vertical bar at the welding position, and the stir bar bar and the vertical bar are sandwiched from above and below by welding electrodes. Thereafter, the stirrup line is moved along with the vertical line by a predetermined pitch. Then, by repeatedly performing such holding, welding, and movement, a plurality of stirrup bars are welded at a predetermined pitch. In the configuration disclosed in Patent Document 1, in order to hold the U-shaped stirrup muscle at the welding position in a predetermined posture, a permanent magnet that magnetizes a horizontal portion of the stirrup muscle, And a permanent magnet for magnetizing the vertical part. Here, the magnet that magnetizes the horizontal part of the stirrup line is attached to a moving means that moves the stirrup line together with the vertical line at a predetermined pitch, while the magnet that magnetizes the vertical part includes a welding electrode. It is arranged on the installed main frame, and is magnetically attached to the stirrup muscle arranged at the welding position and held in a predetermined posture.

Japanese Patent No. 3576027

  By the way, the welding apparatus disclosed in the above-mentioned conventional patent document 1 holds the U-shaped stirrup muscle in a predetermined posture by the magnet of the moving means and the magnet of the main body frame, and the welding means uses the moving means after welding. By pulling forward with the horizontal portion of the stirrup muscle magnetically attached, the vertical portion of the stirrup muscle is pulled away from the magnet of the main frame and moved forward. For this reason, the magnet of the main frame must be at least a magnetic force weaker than the force pulling forward by the moving means. Furthermore, after moving forward at a predetermined pitch after welding, the moving means is moved backward to return to the welding position. At this time, the moving means is moved backward to pull the magnet of the moving means away from the horizontal portion of the stirrup muscle. Therefore, the magnet of the moving means must use at least a magnetic force weaker than the force for moving the moving means to the rear.

  On the other hand, a reinforcing bar of reinforced concrete generally has a bar shape with an irregular cross section having uneven ribs and nodes on its surface. In order to weld these vertical bars and stirrup bars, a welding method in which the upper and lower welding electrodes are clamped with a relatively large pressure (for example, 300 kgf) is used. Thus, it is necessary to hold the stirrup muscle in a predetermined position and posture. However, in the conventional welding device described above (disclosed in Patent Document 1), when a relatively large pressure is applied by the welding electrode as described above, the stirrup muscle cannot be held, and the stirrup muscle The position and posture of the are likely to shift. This is because the stirrup muscle is held in a posture by a magnet, and the magnetic force of the magnet is such a force that the magnet is separated by the movement of the moving means. This is because the stirrup muscle cannot be maintained at a predetermined position or posture. As described above, in the welding apparatus disclosed in the above-described conventional patent document 1, the stirrup muscle cannot be stably welded in a predetermined posture, and further, the pitch of the stirrup muscle is also shifted. There was a problem that it was difficult to stably manufacture steel bars.

  The present invention proposes a welding apparatus for a reinforcing steel bar for reinforcing concrete capable of stably producing stirrup bars and longitudinal bars in a desired form even if the bars have irregular cross sections.

  The present invention relates to a vertical muscle support means for supporting a long vertical stripe so as to be movable in the longitudinal direction, and a stirrup muscle having a horizontal stripe portion arranged substantially orthogonal to the vertical stripe. Holding and moving means for holding at the welding position where the horizontal bar is welded to the vertical bar supported by the vertical bar, and moving the stirrup bar together with the welded vertical bar from the welding position to a separated position with a predetermined distance. In a welding apparatus for a reinforcing steel rod for concrete reinforcement, comprising a welding means comprising a pair of upper and lower welding electrodes for welding by pressing the horizontal streaks of the stirrup bars held at the welding position and the vertical bars from above and below, The holding and moving means includes a clamping device that performs a conversion operation between a clamping state in which the lateral muscle portion of the stirrup muscle is sandwiched from the front and back, and an open state in which the lateral muscle portion can be relatively moved forward, and the clamping device, Stirrup muscle in front A pitch feed device that reciprocally moves the first position as a welding position and the second position as the separation position, and further stirrups the clamp device in a clamped state at the first position. A first control content for keeping the streak immovable at the welding position, and a second control content for moving the clamp device from the first position to the second position by the pitch feeding device while maintaining the clamp device in a clamped state; And an operation control device that sequentially executes a third control content in which the clamp device is converted to an open state at the second position and moved back to the first position by the pitch feeding device. This is a welding apparatus for reinforcing steel for concrete reinforcement.

  Here, the stirrup stirrup is only required to have at least a horizontal streak portion arranged substantially orthogonal to the vertical streak, and is bent into a short bar shape composed of only the horizontal streak portion, an L shape, a U shape, or the like. What was made (so-called non-closed shape), and what was bent into a triangle or a quadrangle (so-called closed shape) could be applied. Further, in this configuration, the longitudinal bars are arranged so that the longitudinal direction thereof is along the front-rear direction in which the clamp device is reciprocated.

  In such a configuration, a clamp device that clamps the lateral streak of the stirrup muscle in the front-rear direction substantially orthogonal to the lateral streak is provided. Even if the welding electrode is clamped with a relatively large pressure, it is possible to prevent the horizontal streak portion of the stirrup muscle from being displaced in the front-rear direction (longitudinal direction of the vertical streak). In addition, since the stirrup muscle is arranged in a direction (hereinafter referred to as a transverse direction) in which the transverse stripe portion is orthogonal to the longitudinal direction of the longitudinal stripe, it is more transverse in the transverse direction along the transverse stripe portion than in the front-rear direction. Hard to slip. Therefore, the lateral displacement of the stirrup muscle can be suppressed by sandwiching the lateral muscle portion from the front and rear by the clamp device. For this reason, by holding the lateral streaks of the stirrup muscle at the welding position with the clamping device, the position and posture of the stirrup muscle with a deformed cross section will be shifted even if it is pinched with a relatively large pressure by the welding electrode. This can be suppressed as much as possible, and the stirrup muscle can be stably held at the welding position. Therefore, according to this structure, the horizontal streak portion and the vertical streak of the stirrup muscle can be accurately and stably welded at the welding position.

  Further, since this configuration performs the clamping of the horizontal streak of the stirrup muscle and the release of the clamping by the conversion between the clamped state and the open state of the clamping device, the holding of the horizontal streak by the clamping device is not performed. There is a clear switch between holding. As a result, the clamp device can clamp the lateral streaks of the stirrup muscle relatively firmly in the clamped state, so that the stirrup muscle can be stabilized even when it is pinched with a relatively large pressure by the welding electrode. The above-described operational effect of the present invention can be improved. As described above, the configuration of the present invention has an extremely high effect of holding the stirrup muscle at the welding position as compared to the conventional magnet described above. Even if the horizontal and vertical streaks of the stirrup muscle are clamped, the stirrup muscle can be stably held at a predetermined position and posture, and these can be stably welded in a desired form.

  Further, in this configuration, the conversion operation between the clamping state and the open state by the clamping device, and the reciprocation operation between the first position (welding position) and the second position (separating position) by the pitch feeding device are first to second. By sequentially executing the three control contents, a series of operations are performed in which a stirrup line is welded to the vertical line and fed forward by a predetermined distance. Therefore, by repeating this series of operations (first to third control contents), a plurality of stirrup bars can be welded to the vertical bars at a predetermined distance (interval) in the longitudinal direction. In particular, in this configuration, the clamp device is moved to the second position while being held by the second control content, and is moved to the first position after being converted to the open state by the third control content. Therefore, the vertical bar and the stirrup bar welded at the welding position can be accurately moved to the separated position and stopped. Therefore, when the first to third control contents are repeatedly executed as described above, a plurality of stirrup bars arranged in the longitudinal direction can be accurately welded at regular intervals, and a plurality of stirrup bars are welded at regular intervals. In addition, a desired concrete reinforcing steel bar can be stably manufactured.

  In the above-described welding apparatus for reinforcing steel for concrete reinforcement, the clamping device of the holding and moving means includes a rear support part that supports the horizontal streak part of the stirrup muscle from the rear, and the front horizontal part supported by the rear support part. A movable support portion that is provided so as to be tiltable to a standing position that is supported from the tilting position, and a tilting position that is tilted forward from the standing position to release the support of the lateral muscle portion and is relatively movable forward, and an operation control device And a drive device that converts the position of the movable support portion to an upright position and a tilted position, wherein the movable support portion is held in a standing position, and the tilted position is set in an open state. A configuration is proposed.

  In such a configuration, the conversion between the sandwiched state and the opened state is realized by a position conversion operation between the standing position and the tilted position of the movable support portion, and a relatively simple tilting of the movable support portion. The operation can be converted into the sandwiched state and the opened state. Thus, the conversion operation between the sandwiched state and the opened state can be performed quickly and accurately, and it can be easily held stably in the sandwiched state or the opened state, and the movable support portion can be relatively moved in the standing position where the sandwiched state is established. Can hold firmly. Therefore, even if the horizontal streaks and vertical streaks of the stirrup muscle having a deformed cross section are clamped by a relatively large pressure with the upper and lower welding electrodes, the effect of suppressing the deviation of the position and posture of the stirrup muscle is further improved. improves. Furthermore, since it is possible to quickly convert between such a relatively strong sandwiched state and an open state, the first control content to the third control content can be executed smoothly and quickly, and the productivity for producing the desired reinforcing steel for concrete reinforcement can be improved. There is also an excellent advantage.

  In the above-described welding apparatus for reinforcing steel for concrete reinforcement, the pitch feeding device of the holding and moving means is disposed so as to be movable along the longitudinal direction of the longitudinal bars, and is engaged with the rack gear coupled to the clamp device. A pinion gear, and a drive motor that is controlled by an operation control device and rotates the pinion gear in the forward direction or the reverse direction, and the pinion gear is rotated to rotate the clamp via the rack gear. A configuration is proposed in which the position of the device is changed between the first position and the second position.

  In such a configuration, the reciprocating movement of the clamp device is performed by interlocking the rack gear and the pinion gear, and the clamp device is controlled by the drive motor to rotate the pinion gear to the first position and the second position. Therefore, the position can be accurately and stably converted. Further, the clamp device can be securely held at the first position or the second position by stopping the drive motor. As a result, the stirrup and vertical bars can be accurately and stably welded at the welding position, and the welded stirrup and vertical bars can be accurately and stably moved from the welding position to the separated position. Therefore, according to the pitch feeder of this configuration, a plurality of stirrup bars arranged in the longitudinal direction can be more accurately welded at regular intervals, and a desired concrete reinforcing steel bar in which the plurality of stirrup bars are welded at regular intervals. Can be manufactured more stably.

  In the above-described concrete reinforcing steel bar welding apparatus, the stirrup bar has a side bar bent from at least one end of the horizontal bar, and the holding and moving means is located above or below the welding position. And a side muscle fixing device that holds the side muscles of the stirrup muscle so as not to move at the welding position. The operation control device of the holding and moving means is configured to fix the side muscles according to the first control content. The device clamps the side streaks of the stirrup muscle, and, according to the second control content, releases the clamping of the side streaks by the side muscle fixing device and moves the clamping device from the first position to the second position by the pitch feeder. A configuration is proposed that is adapted to move forward.

  In such a configuration, when the stirrup muscle having a non-closed shape such as the L shape or the U shape described above or the stirrup muscle having a closed shape such as a triangle or a quadrangle is welded to the vertical muscle, Is held by a lateral muscle fixing device so that it can be stably held in a desired posture with respect to the longitudinal muscle. Therefore, the stirrup bar having the above shape can be welded to the vertical bar accurately and stably in a desired posture. Furthermore, since the side muscle portion is clamped by the side muscle fixing device, the effect of suppressing the Stirrup muscle from being displaced in the lateral direction when being clamped by the welding electrode described above is further improved. In addition, since the clamping by the side bar fixing device is released after welding and the clamp device is moved forward to the second position, the welded stirrup and vertical bars are stable from the welding position to the separated position. Can be moved. Therefore, when a plurality of the stirrup bars are aligned and welded in the longitudinal direction, the stirrup bars can be accurately and stably welded at regular intervals. Therefore, according to the present configuration, a desired concrete reinforcing steel bar can be stably manufactured regardless of whether the stirrup bar having the non-closed shape or the closed shape is welded.

  According to the welding apparatus for reinforcing steel bars for concrete reinforcement of the present invention, as described above, since the horizontal streaks of the stirrup bars are clamped from the front and rear by the clamp device, the stirrup bars are prevented from shifting in the front-rear direction. it can. Thereby, by clamping the horizontal streak portion of the stirrup muscle by the clamping device, even if it is sandwiched by a relatively large pressure by the welding electrode, the stirrup muscle of the irregular cross section can be stably held at a predetermined position and posture. The horizontal streak portion and the vertical streak of the stirrup muscle can be welded accurately and stably at the welding position. Furthermore, since the welded stirrup muscles can be accurately and stably moved to the separated position, a plurality of stirrup muscles can be accurately welded at a predetermined distance. Therefore, a reinforcing steel bar in which a plurality of stirrup bars are welded to the vertical bars can be stably manufactured in a desired form.

It is a side view of the welding apparatus 1 of the reinforcing bar for concrete reinforcement concerning this invention. It is a top view of the welding apparatus 1 same as the above. It is a front view of the welding apparatus 1 same as the above. FIG. 4 is an enlarged sectional view taken along line XX in FIG. 3. It is the YY line expanded sectional view of FIG. FIG. 4 is a perspective view of a tip portion of a clamp device 41. It is explanatory drawing which shows (A) standing position and (B) tilting position of the movable support part 44 of the clamp apparatus 41. FIG. It is explanatory drawing which shows the state which the clamp apparatus 41 exists in (A) 1st position F and (B) 2nd position G. 2 is a block diagram showing a control system of the welding apparatus 1. FIG.

Embodiments according to the present invention will be described with reference to the accompanying drawings.
As shown in FIGS. 1 to 3, a welding apparatus 1 for a reinforcing steel bar for concrete reinforcement according to the present embodiment includes an apparatus main body 2 in which a plurality of welding machines 21 are arranged side by side, and a vertical body disposed behind the apparatus main body 2. A muscle support base 3 and a product receiving base 4 disposed in front of the apparatus main body 2 are provided. The vertical bar support 3 supports the long vertical bars 101 to be sent to the apparatus main body 2, and the product support 4 supports the stirrup muscles 102 and the vertical bars 101 sent out from the apparatus main body 2. Is. In this embodiment, the front-rear direction is defined with respect to the apparatus main body 2, with the arrangement side of the vertical bar support 3 as the rear and the arrangement side of the product support 4 as the front. And the left-right direction substantially orthogonal to the front-back direction is defined as the horizontal direction.

  Here, in this embodiment, the vertical bars 101 are long bar-shaped reinforcing bars. Further, the stirrup bar 102 is a substantially U-shaped bar formed by bending a rod-shaped reinforcing bar (see FIG. 3), and the side bar part 104 bent from both ends of the horizontal bar part 103 and the horizontal bar part 103, 104. These vertical bars 101 and stirrup bars 102 have irregular cross-sections used in general reinforced concrete, and uneven ribs and nodes are formed on the surface (not shown). Further, in this embodiment, as will be described later, the horizontal stripes 103 of the stirrup stripes 102 are passed in a substantially orthogonal shape and welded to the three vertical stripes 101 arranged in parallel at a predetermined interval. The dimension of the stirrup muscle 102 and the interval between the vertical stripes 101 are set such that the length of the horizontal stripe portion 103 of the stirrup stripe 102 is longer than the interval between the vertical stripes 101 on both the left and right sides.

  The apparatus main body 2 includes a rectangular plate-like base base 11 and a main body frame 12 erected on the base base 11, and three welding machines 21 are arranged on the base base 11 side by side. ing. The main body frame 12 includes columns 13 and 13 having a rectangular section standing on both left and right side edges of the base base 11, and an upper beam 14 having a rectangular section extending to the upper ends of the columns 13 and 13. And a middle beam 15 having a rectangular cross section that is provided at a substantially central portion in the vertical direction of the support columns 13. Further, the main body frame 12 is provided with columns 16 and 16 having a rectangular cross section disposed behind the left and right columns 13 and 13, respectively. Are standing side by side.

  Three welding machines 21 are arranged in the apparatus body 2 side by side. Each welding machine 21 includes a transformer 22 and two welding guns 23. The transformer 22 is fixedly disposed on the base base 11, and the two welding guns 23, 23 are arranged in the middle part of the main body frame 12. It is attached to the beam 15 so as to be slidable in the lateral direction. Therefore, each welding machine 21 can change the horizontal position of each welding gun 23 and 23 suitably.

  As shown in FIG. 4, the welding gun 23 includes a gun frame 24 that is slidably engaged with the middle beam 15, and two air cylinders 25, 25 disposed on the gun frame 24. A pair of upper and lower welding electrodes 26, 26 disposed on the gun frame 24 are provided. Furthermore, the gun frame 24 is provided with a frame member 20 having a substantially V-shaped cross section that supports the vertical bars 101 mounted on and supported by the vertical bar support 3 in the front-rear direction. The receiving frame member 20 is disposed along the horizontal direction. By the receiving frame member 20, the long vertical bars 101 mounted on the vertical bar supporting base 3 are arranged along the front-rear direction, and the upper and lower It is possible to accurately guide the welding position P between the welding electrodes 26 and 26. Since the receiving frame member 20 is disposed on the gun frame 24, the receiving frame member 20 can be slid in the lateral direction together with the welding gun 23. Thereby, even if the horizontal position of the welding gun 23 is changed, the vertical bars 101 are guided to the welding position P by supporting the vertical bars 101 by the receiving frame member 20.

  The pair of upper and lower welding electrodes 26, 26 of the welding gun 23 are disposed at a predetermined position in front of the receiving frame member 20 so that the vertical bars 101 supported by the receiving frame member 20 can be sandwiched from above and below. These are provided so as to be movable in the vertical direction. These upper and lower welding electrodes 26 and 26 are moved up and down by the pressure supplied from the air cylinders 25 and 25, move in directions close to each other by the pressure supply, and move in directions away from each other by releasing the pressure. . As a result, the upper and lower welding electrodes 26 and 26 pinch the vertical bars 101 and the horizontal bars 103 of the stirrup bars 102 which are in contact with each other between the welding electrodes, and release the pinching after welding. The position where the vertical stripe 101 and the horizontal stripe portion 103 of the stirrup stripe 102 are clamped and welded by the pair of upper and lower welding electrodes 26, 26 is the welding position P according to the present invention.

  Here, in this embodiment, a single welding gun 23 has two small-diameter air cylinders 25, 25 arranged in the front-rear direction, which is equivalent to a single large-diameter air cylinder. The pressure can be applied to the welding electrodes 26 and 26, and the arrangement space in the lateral direction can be narrower than that of the large-diameter air cylinder. In general, since the welding gun 23 can be reduced in width in the lateral direction (see FIGS. 2 and 3), the welding gun 23 can correspond to a structure in which two vertical bars 101 are arranged at a relatively narrow interval. 101 and the horizontal streak portion 103 of the stirrup muscle 102 can be accurately and stably welded. In this embodiment, a pressure of about 300 kgf is applied to the upper and lower welding electrodes 26, 26 by the two air cylinders 25, 25 so as to sandwich the vertical bars 101 and the horizontal bars 103 of the stirrup bars 102. I can press. Further, the welding gun 23 has a positioning mechanism (not shown) that can be converted into a state in which the welding gun 23 can be slid in the lateral direction along the middle beam 15 and a fixed state in which the lateral position is positioned and fixed to the middle beam 15. I have. This positioning mechanism includes a manual lever operated by an operator, and the welding gun 23 can be disposed at a position corresponding to the product by converting the slidable state and the fixed state by operating the manual lever.

  In the present embodiment, as described above, since three welding machines 21 each having two welding guns 23 are arranged, six vertical bars 101 are arranged at the same time. And can be welded (see FIGS. 2 and 3). The welding machine 21 according to the present embodiment constitutes the welding means according to the present invention, and the longitudinal bar support base 3 and the receiving frame member 20 constitute the vertical bar support means according to the present invention.

Next, the main part of the present invention will be described.
As shown in FIG. 5, in the main body frame 12 described above, guide rails 31 are respectively passed in the front-rear direction on the support columns 13 and 16 arranged in the front-rear direction on both the left and right sides of the base base 11 (see FIG. 3). . Each guide rail 31 is attached to the upper portion of each of the columns 13 and 16 so as to be along the horizontal direction at a position higher than the receiving frame member 20 disposed on the welding gun 23 described above. A rack gear 32 having a predetermined length in the front-rear direction is engaged with the left and right guide rails 31 so as to be movable in the front-rear direction. Further, a connecting rod 33 having a substantially rectangular cross section is provided between the left and right rack gears 32, 32 (see FIG. 3). As a result, the left and right rack gears 32 and 32 and the connecting rod 33 are integrally moved in the front-rear direction.

  The left and right rack gears 32 are respectively engaged with pinion gears 34. The left and right pinion gears 34 and 34 are respectively joined to the rotation shaft 35 and rotate integrally (see FIG. 2). In addition, a rotation drive device 36 is disposed on one of the left and right columns 16 outside the column 16 (see FIGS. 2 and 3). The rotary drive device 36 includes a motor and a speed reducer (not shown), and one end of the rotating shaft 35 is connected to the motor via the speed reducer. By driving the motor of the rotation drive device 36, the left and right pinion gears 34, 34 rotate integrally through the rotation shaft 35, and accordingly, the left and right rack gears 32, 32, the connecting rod 33, Move integrally in the front-rear direction (see FIG. 8).

  In addition, a plurality of clamping devices 41 are respectively engaged with the connecting rod 33 so as to be movable in the lateral direction (see FIGS. 2 and 3). In the present embodiment, four clamping devices 41 are engaged with the connecting rod 33. Each clamp device 41 is provided with a manual positioning mechanism (not shown) that converts the lateral position into a fixed state in which the lateral position is fixed and cannot be moved. The horizontal position can be positioned in accordance with the product size (such as the horizontal spacing of the vertical stripes 101).

  The clamping device 41 includes a base portion 42 that is engaged with the connecting rod 33, a rear support portion 43 and a movable support portion 44 that are provided at the front end of the base portion 42, and an air cylinder 45 that tilts the movable support portion 44. And comprising. Here, the base portion 42 extends in the front-rear direction, and includes an engaging portion 46 that engages with the connecting rod 33 at the upper rear end, and projects forward from the rear portion that is engaged with the connecting rod 33. It is formed to do. And the rear part support part 43 provided in the front end of the base | substrate part 42 supports the horizontal stripe part 103 of the stirrup muscle 102 arrange | positioned in the welding position P from back so that it may mention later. On the other hand, the movable support portion 44 is pivotally supported at the front end of the base portion 42 so as to be tiltable along the front-rear direction, and is connected to the air cylinder 45 via an operating rod 47. Then, by driving the air cylinder 45, the movable support portion 44 is in an upright position (FIG. 7A) for supporting the horizontal streak portion 103 of the stirrup muscle 102 supported by the rear support portion 43 from the front. The support is released by tilting forward from the standing position, and the lateral muscle portion 103 is converted into a tilt position (FIG. 7B) that can be relatively moved forward. Here, when the movable support portion 44 is set to the upright position, as shown in FIGS. 6 and 7A, the horizontal streak portion 103 of the stirrup muscle 102 supported from the rear by the rear support portion 43 is Since it is supported from the front by the movable support portion 44, it can be held and held by the movable support portion 44 and the rear support portion 43 from the front and rear. Further, when the movable support portion 44 is set to the tilted position, as shown in FIG. 7B, the front of the horizontal streak portion 103 of the stirrup muscle 102 is opened, so that the horizontal streak portion 103 is moved forward. It is possible and the rear support part 43 (clamp device 41) can be moved rearward. That is, at the tilted position of the movable support portion 44, the horizontal stripe portion 103 of the stirrup muscle 102 can relatively move forward. The air cylinder 45 that tilts the movable support portion 44 has a performance capable of reliably and stably holding the movable support portion 44 in an upright position. A relatively large pressure is applied by the welding electrodes 26 and 26 described above. Even if it is pinched, the transverse muscle portion 103 of the stirrup muscle 102 can be securely held.

  Since the clamping device 41 is engaged with the connecting rod 33 as described above, it moves integrally with the rack gears 32 and 32 in the front-rear direction as shown in FIG. And as shown to FIG. 8 (A), the rear support part 43 and the standing position are movable by making the clamp device 41 a first position F (refer to FIGS. 4 and 5) that is movable in the front-rear direction. With the support portion 44, the horizontal streak portion 103 of the stirrup muscle 102 can be sandwiched at the welding position P sandwiched between the upper and lower welding electrodes 26, 26 described above. That is, by positioning the clamping device 41 at the first position F, the lateral support portion 103 of the stirrup muscle 102 is placed at the welding position P by the rear support portion 43 and the movable support portion 44 disposed at the front end thereof. Can be pinched. On the other hand, as shown in FIG. 8B, the stirrup clamped between the rear support part 43 and the movable support part 44 by moving the clamp device 41 forward to the second position G in front of the first position F. The streak 102 can be moved from the welding position P to the separation position T with a predetermined distance forward. Then, the stirrup muscle 102 is positioned at the separation position T by stopping the clamp device 41 at the second position G. Here, the distance from the welding position P (first position F) to the separation position T (second position G) is set to the pitch (interval) at which the stirrup streak 102 is welded to the vertical streak 101, and the distance. The lengths of the rack gears 32 and 32 described above are determined so that the clamping device 41 can move in the front-rear direction at an interval between the first position F and the second position G. The first position F of the clamping device 41 and the welding position P can be said to be substantially synonymous, and the second position G of the clamping device 41 and the separation position T can be said to be substantially synonymous.

  In this way, the clamp device 41 rotates from the first position F (welding position P) to the second position G (separating position T) by rotationally driving the motor of the rotation driving device 36 in the forward direction (or the reverse direction). While moving forward, the clamp device 41 at the second position G is moved backward to the first position F by rotating the motor in the reverse direction (or forward direction). The distance between the first position F (welding position P) and the second position G (separating position T) can be set as appropriate according to the product.

  On the other hand, as shown in FIGS. 1 to 3, four side muscle fixing devices 51 are respectively engaged with the upper beam 14 of the main body frame 12 so as to be movable in the lateral direction. Each of the side muscle fixing devices 51 has a manual positioning mechanism (not shown) for converting a laterally movable state along the upper beam 14 and a laterally positioned position into an immovable fixed state. Is provided. Further, as shown in FIGS. 4 and 5, the side muscle fixing device 51 includes a hand portion 52 that sandwiches the side muscle portion 104 of the stirrup muscle 102 from the left and right sides, and an air cylinder 53 that operates the hand portion 52. ing. The hand portion 52 is converted by the air cylinder 53 into a holding state in which the side streak portion 104 is pinched from the left and right to be immovable and a released state in which the pinching is released and the pinion is movable (not shown). ) The side bar fixing device 51 includes a vertical position conversion mechanism (not shown) that can slide in the vertical direction with respect to the upper beam 14, and the vertical height between the hand portion 52 and the air cylinder 53. The position can be appropriately changed according to the shape of the stirrup muscle 102. The vertical position converting mechanism can slide the hand portion 52 and the air cylinder 53 above and below the vertical stripe 101 and can be positioned and fixed above or below the vertical stripe 101. In addition, the vertical position conversion mechanism of the present embodiment manually converts the hand portion 52 and the air cylinder 53 into a state in which the hand portion 52 and the air cylinder 53 can slide in the vertical direction and a fixed state in which the vertical position is positioned.

  Such a side muscle fixing device 51 is positioned on the upper beam 14 at a lateral position in which the left and right two pieces are separated from each other by the distance between the side muscle portions 104 and 104 of the stirrup muscle 102 (see FIGS. 2 and 3). . In addition, the air cylinder 53 of the side muscle fixing device 51 holds the side muscle portion 104 sandwiched by the hand portion 52 so as not to move, and is sandwiched between the welding electrodes 26 and 26 with a relatively large pressure. At this time, it has a performance capable of reliably holding the side stripe portion 104.

  Further, as shown in FIG. 9, the welding apparatus 1 for concrete reinforcing steel bars according to the present embodiment operates to control the above-described welding machine 21, rotation drive device 36, clamp device 41, and side reinforcement fixing device 51. A device 61 is provided. As the operation control of the welding machine 21 by the operation control device 61, the operation of the transformer 22 is controlled to apply a predetermined voltage to the upper and lower welding electrodes 26, 26, and the operation of the air cylinders 25, 25 of the welding gun 23 is controlled. By doing so, it has control which moves up and down the welding electrodes 26 and 26 up and down. In addition, as the operation control of the rotation drive device 36, there is provided control for reciprocating the clamp device 41 in the front-rear direction by driving and controlling the motor of the rotation drive device 36. In addition, as the operation control of the clamp device 41, there is provided control for tilting the movable support portion 44 by controlling the operation of the air cylinder 45. Further, as the operation control of the side muscle fixing device 51, the air cylinder 53 is controlled so as to convert the hand portion 52 into a fixed state and a released state. Such an operation control device 61 executes each of these operation controls in a predetermined order to weld the stirrup muscle 102 to the longitudinal bars 101 at the welding position and move the stirrup muscles 102 to the separated position after the welding. A series of operations are performed.

  That is, when the transverse streak portion 103 of the stirrup muscle 102 is disposed so as to be substantially perpendicular to the vertical streak 101 at the welding position P, the operation control measure 61 is The air cylinder 45 of the clamp device 41 located at one position F is controlled to hold the movable support portion 44 in an upright position so that the horizontal stripe portion 103 is held between the rear support portion 43 (see FIG. 8A) and the side. The air cylinder 53 of the muscle fixing device 51 is controlled to be held, and the hand portion 52 holds the side muscle portion 104 of the stirrup muscle 102. As a result, the stirrup muscle 102 is held at the welding position P in a state where the horizontal stripe 103 is in contact with the vertical stripe 101 and is in a predetermined posture. Next, the air cylinders 25 and 25 of the welding machine 21 are controlled and the upper and lower welding electrodes 26 and 26 sandwich the portion where the horizontal stripe portion 103 and the vertical stripe 101 abut with a predetermined pressure from above and below (FIG. 8 ( A), and a predetermined voltage is applied to the upper and lower welding electrodes 26 and 26 by controlling the operation of the transformer 22. As a result, the horizontal streak portion 103 and the vertical streak 101 of the stirrup muscle 102 are welded. After the welding, the voltage application by the transformer 22 is stopped and the air cylinders 25 and 25 are controlled to release the clamping pressure by the upper and lower welding electrodes 26 and 26. Further, after the air cylinder 53 of the side muscle fixing device 51 is controlled to be released and the holding of the side muscle portion 104 by the hand portion 52 is released, the rotation driving device 36 is controlled to operate the clamp device 41 from the first position F. It moves forward to the second position G and stops at the second position G (see FIG. 8B). As a result, the welded stirrup bars 102 and vertical bars 101 are moved forward from the welding position P to the separation position T and are positioned at the separation position T. Next, operation of the air cylinder 45 of the clamp device 41 is controlled at the second position G to change the position of the movable support portion 44 from the standing position to the tilted position, thereby releasing the holding of the horizontal stripe portion 103 of the stirrup muscle 102. (See FIG. 8B). As a result, the stirrup muscle 102 can be accurately stopped at the separation position T. Thereafter, the rotation drive device 36 is controlled to return the clamp device 41 from the second position G to the first position F. At this time, since the movable support portion 44 of the clamp device 41 is in the tilted position, only the clamp device 41 returns to the first position F while the stirrup muscle 102 is stopped at the separation position T.

  By repeatedly executing such a series of operation control, a plurality of stirrup bars 102 can be welded at predetermined intervals in the longitudinal direction of the vertical bars 101 (see FIG. 1).

  In the present embodiment, the rack gear 32, the pinion gear 34, and the rotation driving device 36 constitute a pitch feeding device according to the present invention. The motor according to the present invention is driven by the motor of the rotation driving device 36. A motor is configured. Further, the air cylinder 45 of the clamp device 41 constitutes a drive device according to the present invention. Further, in the operation control by the above-described operation control device 61, the side support portion 104 of the stirrup muscle 102 is controlled by the control that sets the movable support portion 44 of the clamp device 41 to the standing position and the hand portion 52 of the side muscle fixing device 51. The first control content according to the present invention is realized by the control for sandwiching. Further, the second control content according to the present invention is realized by the control for releasing the clamping by the hand portion 52 of the side muscle fixing device 51 and the control for moving the clamp device 41 forward to the second position G. Further, the third control content according to the present invention is realized by the control for setting the movable support portion 44 of the clamp device 41 to the tilted position and the control for returning the clamp device 41 to the first position F.

Next, the welding process of the reinforcing reinforcing bars composed of the longitudinal bars 101 and the stirrup bars 102 by the above-described concrete reinforcing bar welding apparatus 1 of this embodiment will be described in detail below.
In this embodiment, as reinforcing reinforcing bars, a plurality of U-shaped stirrup bars 102 are welded at a predetermined pitch in the longitudinal direction of the vertical bars 101 to three vertical bars 101 arranged in parallel at predetermined intervals. Manufacturing things. In addition, although the welding apparatus 1 of the reinforcing bar for concrete reinforcement of a present Example can manufacture two reinforcing bars in parallel with right and left, since the welding process is the same, in the following description, it is right and left. One will be described.

  In the welding apparatus 1, as preparation for welding work, each welding gun 23, the clamp device 41, and the side reinforcement fixing device 51 are appropriately set in accordance with the shape and size of the longitudinal bars 101 and the stirrup bars 102 constituting the reinforcing reinforcing bars. Position (see FIGS. 1 to 3). That is, the three welding guns 23 adjacent on the left and right are respectively positioned with a predetermined interval between the vertical bars 101 described above, and the clamp devices 41 are respectively disposed between the three welding guns 23 and positioned. And each clamp apparatus 41 is located in the 1st position F, and makes the movable support part 44 into a tilting position. Further, the two lateral muscle fixing devices 51 are positioned in accordance with the distance between the left and right lateral muscle portions 104 of the stirrup muscle 102 and at a predetermined height position above the welding position P. Position. Here, each side muscle fixing device 51 keeps the hand portion 52 in a released state. Further, the control pattern of the rotation drive device 36 by the operation control device 61 is set so that the distance between the first position F (welding position P) and the second position G (separation position T) of the clamp device 41 becomes a desired pitch. Set.

  After such preparations are made, the three vertical bars 101 are placed side by side on the vertical bar support 3 and the front end portions of the three vertical bars 101 are supported by the receiving frame members 20 of the respective welding guns 23, so that the above-described welding positions are mounted. P (between a pair of upper and lower welding electrodes 26, 26 of each welding gun 23) is passed. As a result, the three longitudinal bars 101 are arranged in the longitudinal direction of each of the longitudinal bars 101 in the front-rear direction, and in a substantially parallel manner at a predetermined interval along the horizontal direction at the welding position P (FIG. 1). To 3). With the vertical bars 101 set in this way, the U-shaped stirrup bars 102 are arranged at the welding position P. Here, the stirrup muscles 102 are placed on the three longitudinal muscles 101 in an upward posture in which the side muscles 104 and 104 protrude vertically upward from the lateral muscles 103 (see FIG. 3). At this time, the rear portion of the lateral muscle portion 103 is brought into contact with the rear portion support portion 43 of each clamp device 41, and the left and right side muscle portions 104, 104 are positioned in the hand portion 52 of each side muscle fixing device 51, respectively. Let As a result, the stirrup muscle 102 is set in a state in which the lateral position and the front-rear direction position are accurately positioned and the lateral stripe portion 103 is passed so as to be orthogonal to the three vertical stripes 101.

  When the stirrup muscle 102 is thus set at the welding position P, the control operation by the operation control device 61 is started. The operation control device 61 controls the operation of the air cylinder 45 of each clamp device 41 to convert each movable support portion 44 from the tilted position to the upright position, so that the lateral muscle portion 103 of the set stirrup muscle 102 is changed. As shown in FIGS. 5, 6, and 7 </ b> A, the rear support part 43 and the movable support part 44 are sandwiched from the front and rear. In synchronism with this, each air cylinder 53 of each side muscle fixing device 51 is controlled to move, so that each hand portion 52 is converted from the released state to the held state, and each of the set stirrup muscles 102 is set. The side muscles 104 are respectively clamped. Thereby, the stirrup muscle 102 is hold | maintained with a predetermined attitude | position (refer FIGS. 1-5). When the stirrup muscles 102 are thus held at the welding position P, the air cylinders 25 and 25 of the welding guns 23 are actuated and controlled by the upper and lower welding electrodes 26 and 26 as shown in FIG. Then, the horizontal muscle 103 and the vertical muscle 101 of the stirrup muscle 102 are clamped at the contact portion. Then, the operation of the transformer 22 of each welding machine 21 is controlled to apply the respective upper and lower welding electrodes 26, 26 at a predetermined voltage, thereby bringing the horizontal streak 103 and the vertical streak 101 of the stirrup muscle 102 into contact with each other. Weld at the site. Here, when clamping between the upper and lower welding electrodes 26, 26, a relatively strong pressure (for example, 300 kgf) acts as described above. Let's move by. On the other hand, since the movable support portion 44 and the rear support portion 43 of the clamp device 41 sandwich the lateral streak portion 103 of the stirrup muscle 102 from the front and rear, the lateral streak portion is applied by the sandwiching pressure of the welding electrodes 26 and 26. It can suppress as much as possible that 103 moves to the front-back direction. In particular, since the movable support portion 44 can be held in the standing position against the pressure of the welding electrodes 26 and 26 by the air cylinder 45, the movement in the front-rear direction can be further suppressed. In addition, by holding the lateral muscle portion 103 between the movable support portion 44 and the rear support portion 43, the lateral motion of the lateral muscle portion 103 can also be suppressed. Further, since the side muscle portions 104, 104 of the stirrup muscle 102 are held by the side muscle fixing devices 51, 51, the lateral movement of the lateral muscle portion 103 can be further suppressed. For this reason, even when the welding electrodes 26 and 26 are clamped with a relatively large pressure during welding, the stirrup muscle 102 having an irregular cross section can be reliably and stably held at the welding position P. The stirrup bar 102 can be welded to the vertical bar 101 at the welding position P and in a desired posture.

  When the above-described welding is finished, the air cylinders 25, 25 of each welding gun 23 are operated and controlled to separate the upper and lower welding electrodes 26, 26, and the operation of the transformer 32 of each welding machine 21 is controlled, The voltage application to the respective upper and lower welding electrodes 26 is stopped. Then, by controlling the operation of the air cylinders 53 of the respective side muscle fixing devices 51, the respective hand portions 52 are converted from the fixed state to the released state. Thereafter, by driving and controlling the motor of the rotary drive device 36, each clamp device 41 is moved forward from the first position F and stopped at the second position G. Here, each clamp device 41 moves from the first position F to the second position G until the movable support portion 44 is held in the standing position. It can be moved integrally from the welding position P to the separation position T.

  Then, after stopping at the second position G, as shown in FIG. 8 (B), the air cylinders 45 of the respective clamp devices 41 are controlled to operate so that the respective movable support portions 44 are moved from the standing position to the tilted position. Convert. Thereby, the state which pinched the horizontal streak part 103 of the stirrup muscle 102 is cancelled | released. Here, since the clamping release by the movable support portion 44 is after the clamp device 41 is stopped at the second position G, the stirrup muscle 102 can be accurately moved to the separation position T, and the separation position T Can be stopped accurately. Thereafter, by driving and controlling the motor of the rotational drive device 36, each clamp device 41 is moved backward from the second position G and stopped at the first position F. Thereby, each clamp apparatus 41 is returned to the original first position F. During this backward movement, since the movable support portion 44 of the clamp device 41 is in the tilted position as described above, the welded stirrup muscle 102 remains stopped at the separation position T.

  A series of operations from the operation of holding the stirrup muscle 102 set at the welding position P in this way to the operation of moving to the second position G (separation position T) after welding and returning to the first position F again is performed. By performing this, the stirrup muscle 102 can be welded to the vertical muscle 101 and the stirrup muscle 102 can be separated from the welding position P by a predetermined distance. Therefore, by repeatedly executing such a series of operations, a plurality of stirrup bars 102 can be sequentially welded at a predetermined pitch in the longitudinal direction of the vertical bars 101, and thus the desired reinforcing bars described above can be manufactured. .

  In the concrete reinforcing steel bar welding apparatus 1 of the present embodiment, as described above, the stirrup bar 102 having an irregular cross section can be stably held at the welding position P during welding. Can be welded to the longitudinal bars 101 accurately and stably at a predetermined position and posture. This is because the lateral muscle portion 103 of the stirrup muscle 102 is sandwiched from the front and rear by the movable support portion 44 and the rear support portion 43 of the clamp device 41, and the side muscle portions 104, 104 of the stirrup muscle 102 are side by side. This is due to being clamped by the muscle fixing device 51. In addition, the clamping device 41 performs a conversion operation between the holding state and the open state of the lateral muscle portion 103, a conversion operation between the holding state and the released state of the side muscle portion 104 by the side muscle fixing device 51, and a first operation of the clamping device 41. Since the reciprocating movement to the position F and the second position G is controlled in association with each other, the stirrup muscles 102 and the longitudinal bars 101 having irregular cross sections at the welding position P are accurately and stably formed in a desired form. The welded stirrup muscle 102 and the longitudinal stripe 101 can be accurately moved forward at a predetermined pitch. Thereby, the plurality of stirrup bars 102 can be accurately and stably welded at a predetermined pitch in the longitudinal direction of the vertical bars 101, and a desired reinforcing steel bar for concrete reinforcement can be manufactured stably.

  In the above-described conventional configuration (Patent Document 1), the stirrup muscle is magnetically attached and held by a permanent magnet, and the permanent magnet is separated and released by moving the moving means. There is a possibility that the position and posture may be shifted due to the pressure of the electrodes, and the position where the stirrup muscle is moved and stopped is likely to be shifted, and it is difficult to accurately weld a plurality of stirrup muscles at a predetermined pitch. Therefore, with this conventional configuration, it is difficult to stably manufacture a desired reinforcing steel bar. Such a problem due to the conventional configuration does not occur in the above-described embodiment, and an excellent effect is achieved in that the production efficiency of reinforcing bars can be dramatically improved.

In this invention, it is not limited to the Example mentioned above, It can implement by changing suitably also about structures other than these Examples within the range of the meaning of this invention.
For example, in this embodiment, the U-shaped stirrup muscles 102 are welded in a posture opened upward, but the stirrup muscles 102 are welded to the vertical stripes 101 in a posture opened downward. May be. Here, if the stirrup muscle 102 is opened downward, the lateral muscle portions 104 and 104 are suspended downward from the lateral muscle portion 103, so that the longitudinal muscle 101 is positioned inside the side muscle portions 104 and 104. Then, it is welded to the transverse stripe portion 103. When the stirrup muscle 102 is welded in such a downwardly open posture, the side reinforcement 104, 51 is moved and positioned below the longitudinal muscle 101 to position the side reinforcement 104 as in the above embodiment. 104 can be held by the respective hand portions 52. As described above, even when the stirrup muscle 102 is welded in the downward posture, the welding apparatus 1 of the present embodiment has the welding machine 21, the clamp device 41, the side reinforcement fixing device 51, etc. Since it is arranged behind the welding position P, when moving the stirrup muscle 102 from the welding position P to the separation position T, there is also an excellent advantage that the movement is not hindered. As described above, according to the configuration of the present embodiment, the U-shaped stirrup muscle 102 can be accurately and stably welded in any upward or downward posture.

  In addition, the configuration of this embodiment is not limited to the U-shaped stirrup muscle 102, but L-shaped stirrup muscles, stirrup muscles such as triangles and quadrangles, and short bar-shaped stirrup muscles composed only of horizontal stripes are also welded. Any Stirrup muscle can be welded accurately and stably as in the U shape. Note that the side muscle fixing device 51 can be appropriately selected and used according to the form of the stirrup muscle, and by determining each position in the lateral direction and the vertical direction according to the form of the stirrup muscle, Stirrup muscles can be held in a desired posture.

1 Welding equipment for reinforcing steel for concrete reinforcement 3 Longitudinal bar support stand (longitudinal bar support means)
4 Product stand (longitudinal muscle support means)
21 Welding machine (welding means)
26 Welding electrode 32 Rack gear 34 Pinion gear 36 Rotation drive device 41 Clamp device 43 Rear support portion 44 Movable support portion 45 Air cylinder (drive device)
51 Side Muscle Fixing Device 61 Operation Control Device 101 Longitudinal Muscle 102 Stirrup Muscle 103 Horizontal Muscle Portion 104 Side Muscle Portion F First Position G Second Position P Welding Position T Separation Position

Claims (4)

Longitudinal muscle support means for supporting the long longitudinal muscles so as to be movable in the longitudinal direction;
The stirrup bar having a horizontal bar portion arranged substantially orthogonal to the vertical bar is held at a welding position where the horizontal bar is welded to the vertical bar supported by the vertical bar support means, and the vertical bar is welded. And a holding and moving means for moving the stirrup line from the welding position to a separated position with a predetermined distance forward,
In a welding apparatus for a reinforcing steel bar for concrete reinforcement, comprising a welding means having a pair of upper and lower welding electrodes for pressing and welding the horizontal streaks of the stirrup bars held at the welding position and the vertical bars from above and below,
The holding and moving means is
A clamping device that operates to convert the stirrup muscle from a front and rear holding state into a sandwiched state and an open state in which the lateral muscle portion can be moved relatively forward;
A pitch feed device for reciprocating the clamp device between a first position where the stirrup line is the welding position and a second position where the stirrup line is the separation position;
In addition,
The first control content for holding the stirrup muscle immovably at the welding position with the clamping device held in the first position, and the pitch feed device from the first position while maintaining the clamping device held in the holding state. The operation of sequentially executing the second control content for moving forward to the second position and the third control content for converting the clamp device to the open state at the second position and returning to the first position by the pitch feeder. A welding apparatus for reinforcing steel for concrete reinforcement, comprising a control device. The clamping device of the holding and moving means is
A rear support part that supports the lateral muscle part of the stirrup muscle from behind,
Tilt to a standing position that supports the horizontal muscle portion supported by the rear support portion from the front, and a tilt position that tilts forward from the standing position to release the support of the horizontal muscle portion and relatively move forward. A movable support section provided in a possible manner;
A drive device that is operation-controlled by an operation control device and converts the position of the movable support portion to a standing position and a tilt position;
The welding apparatus for a reinforcing steel rod for concrete reinforcement according to claim 1, wherein the movable supporting portion is in a sandwiched state by being in an upright position and is in an open state by being in a tilted position. The pitch feeding device of the holding and moving means is
A rack gear arranged movably along the longitudinal direction of the longitudinal bars and connected to the clamping device;
A pinion gear meshed with the rack gear;
A drive motor that is controlled by an operation control device to rotate the pinion gear in a forward direction or a reverse direction, and by rotating the pinion gear, the clamp device is moved to a first position via the rack gear. The welding apparatus for reinforcing steel for reinforcing concrete according to claim 1 or 2, wherein the position is converted to a second position. The stirrup muscle has a side muscle portion bent from at least one end of the transverse muscle portion,
The holding and moving means includes a side muscle fixing device that is disposed above or below the welding position and clamps the side muscles of the stirrup muscle at the welding position so as not to move.
The operation control device of the holding and moving means holds the side muscle portion of the stirrup muscle by the side muscle fixing device according to the first control content, and the side muscle portion by the side muscle fixing device according to the second control content. 4. The concrete reinforcement according to claim 1, wherein the clamping device is released and the clamp device is moved forward from the first position to the second position by the pitch feeding device. 5. Rebar welding equipment.

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