JP2011235329A - Apparatus for bending reinforcing bar - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus for bending a reinforcing bar which easily bends the reinforcing bar into a planar shape having little twist even when bend and twist are present in the reinforcing bar before being worked.SOLUTION: The apparatus for bending a reinforcing bar includes a pair of bending units 10, 10 the interval of which is freely adjustable and a clamper 20 which is arranged between the bending units. The bending units respectively have fulcrum rolls 11, 11, turning tables 13, 13 which are turned around the fulcrum rolls and point-of-force-application rolls 12, 12 on the turning tables. Each turning table forms a common obliquely upward guide surface at bending work, the clamper clamps the reinforcing bar which is supported at both end portions by the fulcrum rolls and stood still on the guide surface, the bending units bend the reinforcing bar along the guide surface.

Description

  The present invention relates to a reinforcing bar bending apparatus useful for bending a reinforcing bar to make a frame-shaped hoop, for example.

  Hoop bars formed by bending reinforcing bars into U-shaped, square, rectangular, etc. frame shapes are fixed around the main bars, such as reinforced concrete columns, to fix the position of the main bars, resist shearing force, and compress. Prevent buckling of the main muscles due to force.

  In order to manufacture such a hoop bar, a pair of bending units formed by combining a pair of upper and lower fulcrum parts and a force point roll that swivels around the fulcrum part are used, and the two bending positions of the reinforcing bar are simultaneously set. A bending apparatus for bending upward or downward is known (for example, Patent Document 1). The pair of bending units can be moved back and forth on a common straight line to set the interval between the bending positions, and a clamper that clamps the rebar being bent is arranged in the middle of the bending position. Has been. Therefore, according to this configuration, for example, the linear reinforcing bar can be bent into a rectangular frame by changing the interval between the bending units and performing the bending process at two right angles twice.

JP 2003-117612 A

  When such a conventional technique is used, it is sufficient that the rebar before processing supplied to the bending unit is a straight line, but if the rebar before processing is bent or twisted, there is a problem in that a correct planar hoop cannot be formed. there were. This is because the posture control of the reinforcing bars before processing cannot be performed, and the bending direction of the reinforcing bars by each bending unit cannot be matched with the bending direction of the reinforcing bars before processing. This problem is particularly noticeable when the rebar before processing is supplied in the form of a roll and is unwound for use. This is because it is not easy to correct the unrolled reinforcing bar into a correct straight line even through the correction device.

  Therefore, in view of the problems of the prior art, the object of the present invention is to form a diagonally upward guide surface common to a pair of bending units, so that even if the reinforcing bars before processing are bent or twisted, there is little twist. An object of the present invention is to provide a reinforcing bar bending apparatus that can be easily bent into a flat shape.

  In order to achieve the above object, the configuration of the present invention includes a pair of bending units whose distances can be adjusted, and a clamper disposed between the bending units. The bending units each include a fulcrum roll and a fulcrum roll. There is a swivel table that swivels around and a power point roll on the swivel table, and each swivel table forms a common diagonally upward guide surface during bending, and the clamper supports both ends by fulcrum rolls The gist is to clamp the reinforcing bar that is stationary on the guide surface, and the bending unit bends the reinforcing bar along the guide surface.

  The bending unit may be mounted on each of the carts that move back and forth opposite to each other on a straight line.

  Further, an auxiliary guide that forms the same surface as the guide surface may be attached to each carriage, and a fixed guide that forms the same surface as the guide surface may be provided at the lower portion of each bending unit.

  According to the configuration of this invention, even if the reinforcing bar before processing is bent or twisted, if the reinforcing bar is supported at both ends by the fulcrum roll, the common oblique upward guide surface formed by the turning table of the bending unit And is fixed on the guide surface in a fixed posture. Therefore, the clamper can clamp the rebar that is stationary on the guide surface in this way. On the other hand, since the bending unit bends the reinforcing bars on the guide surface in parallel along the guide surface, the bending unit can be bent correctly in the bending direction of the reinforcing bars, and a correct planar bending process with less torsion can be performed.

  Each bending unit is mounted on a cart that moves back and forth opposite to each other on a straight line, so that the spacing can be freely adjusted via the cart and the bending position of the reinforcing bar can be set.

  If the auxiliary guide that forms the same plane as the guide surface is attached to the outside of the bending unit of each carriage, that is, on the side where the power point roll of the bending unit is turned, the tip of the reinforcing bar being bent can be guided by the auxiliary guide. Can be bent with less twist.

  By providing a fixed guide that forms the same plane as the guide surface at the bottom of each bending unit, both ends of the reinforcing bar being bent can be guided continuously until the bending is completed, and bending with less twist Can be processed. However, the bending direction of the reinforcing bars by each bending unit is only downward.

Overall configuration perspective view Overall configuration front view Expanded cross-sectional view of the main part Explanatory drawing of essential parts (1) Explanatory drawing of essential parts (2) Explanatory drawing of essential parts (3) Expansive perspective view of main part (1) Explanatory drawing of essential parts (4) Explanatory drawing of essential parts (5) Operation explanatory diagram (1) Expansive perspective view of main part (2) Operation explanatory diagram (2) Operation explanatory diagram (3) Operation explanatory diagram (4) Explanatory drawing of essential parts (6)

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  The reinforcing bar bending apparatus mainly includes a pair of bending units 10 and 10 that can be adjusted in distance and a clamper 20 disposed between the bending units 10 and 10 (FIGS. 1 and 2). The bending units 10 and 10 are mounted on carts 31 and 31 that move back and forth opposite to each other on the base frame 50 in a straight line.

  Stands 53 and 53 are erected on both ends of the base frame 50. A frame 54 is installed on the stands 53 and 53. In order to attach the clamper 20, a stand 55 is erected at the center of the base frame 50.

  Each carriage 31 is installed on slide rails 40, 40 on the base frame 50 via front, rear, left, and right sliders 43, 43 (FIGS. 2 and 3). On the base frame 50, the slide rails 40, 40... Are divided for each carriage 31 on both sides of the central stand 55, and are laid in a straight line on the base frame 50 via the bases 40a, 40a.

  A motor 44 with a driving brake is incorporated in the carriage 31. The pinion 45 at the shaft end of the motor 44 is engaged with a rack 46 arranged in parallel with one slide rail 40. Accordingly, the carriage 31 can be moved back and forth on the slide rails 40 and 40 by driving the motor 44 forward and backward, and the carriages 31 and 31 can be moved back and forth on a straight line. . However, as for the moving direction of each carriage 31, the direction in which the carriages 31 and 31 approach is the forward direction, and the direction in which the carriages 31 and 31 are separated is the backward direction.

  A pair of upper and lower stopper devices 32 and 32 are attached to a low position on the front side of the carriage 31 and a high position on the rear side, respectively.

  The front and rear stopper devices 32, 32,... Are respectively disposed above and below the strip-like rails 51, 52. The front-side rail 51 is detachably attached to the rear middle portion of brackets 51 a, 51 a... Erected on the front upper surface of the base frame 50, and the rear-side rail 52 is erected on the rear surface of the base frame 50. It attaches to the upper end of bracket 52a, 52a ... so that attachment or detachment is possible. The rails 51 and 52 are also connected to stands 53 and 53 at both ends of the base frame 50, respectively. In FIG. 3, only one bracket 51a, 51a,..., 52a, 52a.

  The upper and lower stopper devices 32, 32 of the rail 51 are configured by assembling a lever 33 and an air cylinder 34 symmetrically with respect to a bracket 32 a attached to the carriage 31 (FIG. 4A).

  The lever 33 is swingable around the support pin 32 b on the bracket 32 a, and the air cylinder 34 is connected to one end of the lever 33. The lever 33 forms an eccentric cam around the support pin 32b. That is, when the air cylinder 34 is shortened, a gap δ is formed between the lever 33 and the rail 51. However, when the air cylinder 34 is extended to stand (in the arrow direction in FIG. 4B), the support pin 32b A part of the outer periphery can be pressed against the rail 51. Note that the upper and lower levers 33 and 33 can stand up at the same time and sandwich the rail 51 from above and below, thereby strongly locking the carriage 31 in the extending direction of the air cylinders 34 and 34. The same applies to the stopper devices 32, 32 on the upper and lower rear surfaces of the rail 52.

  However, in the stopper devices 32, 32... On each carriage 31, the extending direction of the air cylinders 34, 34 is set to the forward direction of the carriage 31, respectively (FIG. 2). Thus, each carriage 31 can be locked in the forward direction via the stopper devices 32, 32.

  Each bending unit 10 is incorporated in the upper part on the front side of the carriage 31 in an obliquely upward direction (FIGS. 1 and 3). However, each cart 31 is provided with an auxiliary guide 30a having the same inclination as that of the bending unit 10 on the outside of the bending unit 10, and on the front side of the base frame 50, auxiliary guides 30a, 30a on the carts 31, 31 are provided. Are attached to the inclined fixed guides 30b, 30b. The fixed guides 30b, 30b,... Are fixed via brackets 51a, 51a,... On the base frame 50, and are provided below the bending units 10, 10 for all of the longitudinal movement strokes of the carriages 31, 31.

  Each of the bending units 10 and 10 includes a fulcrum roll 11, an oblique turning table 13 that turns around the fulcrum roll 11, and a force point roll 12 on the turning table 13 (FIGS. 3 and 5).

  The fulcrum roll 11 is fixed to the shaft end of the shaft 11 a located at the center of the turning table 13 (FIGS. 5 and 6A), and the force point roll 12 is against the support shaft 12 a standing on the turning table 13. It is mounted rotatably. The fulcrum roll 11 and the power point roll 12 are each perpendicular to the swivel table 13, and the power point roll 12 can be swung around the fulcrum roll 11 together with the swivel table 13 (arrows K2, FIG. 5). K3 direction). However, the swivel table 13 is fixed to the shaft end of the hollow shaft 13a that houses the shaft 11a for the fulcrum roll 11, and is driven in the forward and reverse directions via the gears 36a and 19 by the drive motor 36 incorporated in the carriage 31. can do. 6A is a cross-sectional view corresponding to the arrow XX when the power point roll 12 is turned 90 ° in the direction of the arrow K 2 in FIG.

  A stopper 14 is screwed on the carriage 31 so as to partially protrude on the turning table 13 of the bending unit 10. A spacer 14 a is detachably attached to the tip of the stopper 14 in order to adjust and set a distance d between the outer periphery of the fulcrum roll 11. The bending unit 10 retracts the power point roll 12 close to the stopper 14 (solid line in FIG. 5), carries the reinforcing bar S into the space d between the fulcrum roll 11 and the stopper 14, and moves the power point roll 12 to the fulcrum roll 11. Can be bent (the two-dot chain line in FIG. 5, the direction of the arrow K2). This is because the reinforcing bar S is driven so that the stopper 14 side is restrained by the stopper 14 from the fulcrum roll 11 while the opposite side is wound around the fulcrum roll 11 by the power point roll 12.

  The interval d can be adapted to the outer diameter of the reinforcing bar S by attaching / detaching the spacer 14 a to / from the stopper 14, and the bending angle of the reinforcing bar S can be arbitrarily set by the turning angle of the power point roll 12. The bending direction of the reinforcing bar S (the direction of the arrow K2 in FIG. 5) is the downward direction, and is in a plane parallel to the turning table 13, the auxiliary guide 30a, and the fixed guide 30b.

  Therefore, the turning tables 13 and 13 of the bending units 10 and 10 on the carriages 31 and 31 form a common oblique upward guide surface 30 having an angle α with respect to the vertical surface when the reinforcing bar S is bent ( FIG. 7). Note that α≈20 ° to 45 ° may be set, and α = 30 ° ± 10 ° is particularly preferable. Further, the auxiliary guides 30a, 30a on the carriages 31, 31 form the same surface as the guide surface 30 together with the fixed guides 30b, 30b, ... on the base frame 50 side.

  The clamper 20 includes a clamper guide 21, a clamper receiver 22, and a clamper pusher 23 (FIGS. 7 and 8).

  The clamper guide 21 is a vertically long plate member having an upper open notch 21a in the upper half, and is fixed obliquely upward to a stand 55 on the base frame 50 via a bracket 22b. The clamper receiver 22 is connected to the air cylinder 22a via an adapter 22a1. The lower surface of the adapter 22a1 is in sliding contact with the upper surface of the slide base 22a2 on the bracket 22b, and the air cylinder 22a is fixed on the bracket 22b via the bracket 22c. The clamper pusher 23 is connected to a downward air cylinder 23a, and the air cylinder 23a is fixed to a stand 55 via a bracket 23b. The clamper receiver 22 and the clamper pusher 23 face each other in the notch 21 a of the clamper guide 21.

  The clamper 20 extends the air cylinders 22 a and 23 a, advances the clamper receiver 22, and lowers the clamper pusher 23, thereby clamping the rebar S crossing the upper portion of the clamper guide 21 between the clamper receiver 22 and the clamper pusher 23. (FIG. 9A). Further, the clamper 20 can release the clamp of the rebar S by raising the clamper pusher 23 by shortening the air cylinder 23a (FIG. 5B), and shortening the air cylinder 22a and the clamper receiver 22 By retracting, the rebar S on the clamper guide 21 can be dropped downward (in the direction of the arrow in FIG. 3C). However, the clamper receiver 22 extends the air cylinder 22a so as to protrude from the front surface of the clamper guide 21 (FIGS. 9A and 9B), and shortens the air cylinder 22a so as to be within the notch 21a of the clamper guide 21. (Fig. 3C). The slide base 22a2 supports the clamper receiver 22 through the adapter 22a1, and prevents harmful overload from occurring on the air cylinder 22a.

  In addition, the diagonally upward front surface of the clamper guide 21 is in the same plane as the fixed guides 30b, 30b. Therefore, the clamper 20 can clamp the rebar S on the common guide surface 30 and release the clamp.

  When the linear reinforcing bar S is bent, the carriages 31 and 31 are appropriately positioned on both sides of the clamper 20, and the reinforcing bar S is carried between the bending units 10 and 10 on both sides (FIG. 10). At this time, both ends of the reinforcing bar S are supported by the fulcrum rolls 11, 11, and the intermediate portion crosses the front surface of the clamper guide 21 above the clamper receiver 22 of the clamper 20 and is positioned along the common guide surface 30. . That is, the rebar S is easily rotated by its own weight on the fulcrum rolls 11 and 11 even if there is a slight bend or twist, and the overall posture changes, and finally the clamper of the clamper 20 that forms the guide surface 30. The guide 21 is stably positioned on the guide surface 30 so as to be stationary along the turning table 13 of each bending unit 10 at both ends of the reinforcing bar S and the auxiliary guide 30a. Note that the clamper receiver 22 is installed at a position slightly lower than the support positions at both ends of the reinforcing bar S by the fulcrum rolls 11 and 11 in consideration of the lowering of the intermediate part due to the bending and twisting of the reinforcing bar S before bending. .

  When bending the reinforcing bar S, the bending units 10 and 10 on both sides are operated to bend both ends of the reinforcing bar S downward (in the directions of arrows K2 and K2 in FIG. 10). At this time, since the bending units 10 and 10 bend the reinforcing bar S on the guide surface 30 along the guide surface 30, the bending units 10 and 10 can be bent correctly in the bending and twisting directions of the reinforcing bar S, and the twist after the processing is performed. Less. When bending the reinforcing bar S, the clamper 20 is operated to clamp the reinforcing bar S stationary on the guide surface 30, thereby preventing the reinforcing bar S from being twisted during the bending process. Moreover, when changing the diameter of the reinforcing bar S, the clamper receiver 22, the fulcrum rolls 11 and 11, the force point rolls 12 and 12, and a part or all of the spacers 14a and 14a are appropriately replaced.

  The clamper 20 is provided with an obliquely downward discharge chute 70 (FIGS. 1 and 8). The discharge chute 70 has pipe members or rod support members 71, 71... That are smoothly bent and arranged at the end (FIGS. 8 and 11), and the upper end portion is detachably connected to the upper surface of the clamper guide 21. Is provided with a common stopper plate 72. A reinforcing material 73 with a reinforcing plate 73a is attached to each of the central supporting materials 71 and 71 from the lower side. The discharge chute 70 has an upper steeply inclined portion 70a and a lower gently inclined portion 70b, and protrudes greatly from the front surfaces of the left and right fixed guides 30b and 30b.

  The bending unit 10 is configured to protrude and retract with respect to the auxiliary guide 30a in order to discharge the rebar S after bending to the discharge chute 70, and the form thereof will be described (FIG. 6A).

  The shaft 11a of the fulcrum roll 11 is housed relative to the hollow shaft 13a for the swivel table 13 via an upper bush 13a1 and an intermediate ring 13a2 so as to be relatively rotatable and non-movable in the axial direction. . However, the ring 13a2 is divided into two parts to be engaged with a groove on the outer periphery of the shaft 11a and is screwed to the lower end of the shaft 13a. The lower part of the shaft 11a is connected to the air cylinder 16 through a joint 16a after passing through a fixing plate 18 at the lower end of the housing 17 fixed to the carriage 31. However, the shaft 11a can be relatively moved up and down with respect to the fixed plate 18 via the spline 18a, but is not relatively rotatable. The air cylinder 16 is fixed upward via brackets 18b and 18c connected to the fixing plate 18.

  The shaft 13a is rotatably supported via upper and lower bushes 15a and 17a attached to the housings 15 and 17 on the carriage 31. Further, the shaft 13a is connected to the shaft 11a via the ring 13a2 so as to be rotatable relative to the shaft 11a and not relatively movable in the axial direction, and can move up and down in the housings 15 and 17 together with the shaft 11a. The gear 19 to be mounted on the shaft 13a is rotatably supported via bearings 15b and 17b in the housings 15 and 17, and is not relatively rotatable with respect to the shaft 13a via the spline 19a and is relatively relative to the shaft direction. It is movably engaged. Note that the gear 36 a at the shaft end of the drive motor 36 meshes with the gear 19.

  When the air cylinder 16 is extended, the shafts 11a and 13a are lifted together, and the upper surface of the turning table 13 is flush with the auxiliary guide 30a (FIG. 6A). When the air cylinder 16 is shortened, the turning table 13 descends lower than the auxiliary guide 30a (FIG. 6B). At this time, the shafts 11a and 13a move relative to the fixed plate 18 and the gear 19 in the axial direction via the splines 18a and 19a, respectively. A dust seal 13b is suspended from the lower surface of the swivel table 13, and the recess 13c around the swivel table 13 is continuous with the auxiliary guide 30a via slow and steep slopes 30c, 30d, 30d (FIG. 5). . That is, the swivel table 13 can move in and out of the auxiliary guide 30 a together with the fulcrum roll 11 and the force point roll 12 without rotating relative to the fulcrum roll 11. It can be haunted.

  When the reinforcing bar S that has been bent is discharged to the outside, the bending units 10 and 10 are lowered below the guide surface 30 (FIG. 6B). When the clamper pusher 23 of the clamper 20 is raised to release the clamp of the reinforcing bar S (FIG. 9B), the clamper receiver 22 is retracted into the notch 21a of the clamper guide 21 (FIG. 9C). ) The rebar S loses all support on the guide surface 30 and falls along the clamper guide 21 (in the direction of the arrow in FIG. 9C). Therefore, the discharge chute 70 quickly moves the dropped rebar S to the lower gently inclined portion 70b through the upper steeply inclined portion 70a and stops it with the stopper plate 72 at the lower end (FIGS. 8 and 11). The rebar S discharged onto the discharge chute 70 can be taken out at any time without stopping the operation of the bending units 10 and 10 and the clamper 20. The gentle slope 30c on the lower side of each bending unit 10 contributes to dropping the rebar S having a short bent portion onto the discharge chute 70 without any trouble.

  A vertically long center pusher 60 is incorporated between the left and right fixed guides 30b, 30b of the discharge chute 70 (FIGS. 1 and 8).

  The center pusher 60 is constructed by connecting a pipe 61 or a rod-shaped movable member 61 having a circular cross section to an air cylinder 61a. The air cylinder 61a is supported obliquely via brackets 62a and 62b on the base frame 50, and the movable member 61 is held in parallel with the left and right fixed guides 30b and 30b. Therefore, when the center pusher 60 extends the air cylinder 61a, about 1/2 of the cross section of the movable member 61 protrudes to the front side of the fixed guides 30b and 30b (two-dot chain line in FIG. 8), and the air cylinder 61a is When shortened, the entire movable member 61 retreats lower than the fixed guides 30b and 30b (solid line in the figure).

  For example, as shown in FIG. 12, the center pusher 60 is used when the reinforcing bar S is bent and formed into a rectangular frame shape with hook portions S1 and S2 provided at both ends. That is, when the movable member 61 of the center pusher 60 is projected to the front side of the fixed guides 30b and 30b during the final bending process of the reinforcing bar S shown by the two-dot chain line in FIG. S1 rides on the movable member 61 within the range of elastic deformation, and can pass through the upper part of the hook part S2 without colliding with the hook part S2 on the opposite side. Thereafter, if the movable member 61 is retracted lower than the fixed guides 30b and 30b, the hook portion S1 can be correctly overlapped with the hook portion S2.

  The movable member 61 only needs to protrude as a smooth mountain-shaped cross-sectional shape on the front side of the fixed guides 30b and 30b, and may have a cross-sectional shape such as a semicircular shape or a kamaboko shape in addition to a circular cross-section. Further, only the side (left side in FIG. 12) on which the reinforcing bar S is mounted may have a smooth asymmetric cross-sectional shape.

  The outline of the operation of the bending apparatus when the linear reinforcing bar S is bent and formed into a rectangular frame shape joining both ends is as follows (FIG. 13).

  First, the carriages 31 and 31 are moved to predetermined positions P1 and P1, and the positions and intervals of the bending units 10 and 10 are appropriately set (FIG. 13A). Is locked at positions P1 and P1. Further, the power point roll 12 of each bending unit 10 is retracted near the stopper 14, and the clamper 20 advances the clamper receiver 22, raises the clamper pusher 23, and stands by (FIG. 9B).

  Next, when the linear reinforcing bar S is supplied between the bending units 10 and 10 (two-dot chain line in FIG. 10 and one-dot chain line in FIG. 13A), the reinforcing bar S is positioned along the common guide surface 30. And rests on the guide surface 30. Therefore, the intermediate portion of the reinforcing bar S is clamped by the clamper 20 (FIG. 9A).

  Subsequently, the bending units 10 and 10 are operated to bend both ends of the reinforcing bar S (in the directions of arrows K2, K2 and solid lines in FIG. 13A). Thereafter, each bending unit 10 retracts the power point roll 12 to the original position (in the directions of arrows K3 and K3 in the figure). The reinforcing bar S is bent in parallel with the common guide surface 30, and the clamper 20 continues clamping while the reinforcing bar S is bent.

  Next, the stopper devices 32, 32... Of the carriages 31, 31 are removed, the carriages 31, 31 are moved to preset positions P2, P2, and the carriages 31, 31 are locked by the stopper devices 32, 32. 13 (B)). Thereafter, the clamp of the reinforcing bar S by the clamper 20 is temporarily released, the posture of the reinforcing bar S is made to follow the guide surface 30, and the reinforcing bar S is re-clamped. Then, the bending units 10 and 10 are operated to bend the both ends of the reinforcing bar S again (arrows K2, K2 directions, solid lines in FIG. 13B). The clamper 20 continues clamping while the reinforcing bar S is bent.

  When the bending process is completed, the power point roll 12 of each bending unit 10 is retracted to the original position (in the directions of arrows K3 and K3 in FIG. 13B). Subsequently, the bending units 10 and 10 are lowered below the guide surface 30, and the clamper 20 releases the clamp of the rebar S and retracts the clamper receiver 22 below the guide surface 30 (FIG. 9C). Therefore, the reinforcing bar S that has been bent falls along the clamper guide 21 and stops at the stopper plate 72 at the lower end via the steeply inclined portion 70a and the gently inclined portion 70b of the discharge chute 70 (FIG. 8). Therefore, the reinforcing bar S on the discharge chute 70 may be taken out appropriately. On the other hand, the carriages 31, 31 are disengaged from the stopper devices 32, 32, moved to the original positions P1, P1, locked by the stopper devices 32, 32, and ready for the next rebar S bending (see FIG. 13 (A)).

  When the reinforcing bar S is bent into a rectangular frame shape that is provided with hook portions S1 and S2 at both ends, the procedure shown in FIGS. That is, the carriages 31 and 31 are moved to the positions P1 and P3 and locked, and both ends of the reinforcing bar S are bent to 90 ° or more to form hook portions S1 and S2 (the dashed line in FIG. Next, the carriages 31 and 31 are moved to positions P2 and P4 to bend the reinforcing bar S (the one-dot chain line in FIG. 14B, solid line), and only the left carriage 31 is moved to the position P5. (FIG. 14C), while using the center pusher 60, the hook portion S1 may be bent so as to overlap the hook portion S2 (two-dot chain line in FIG. 12, one-dot chain line in FIG. 14C). ,solid line).

  Also in this case, the carts 31, 31 being bent are locked via the stopper devices 32, 32, and when the carts 31, 31 are moved, the locks by the stopper devices 32, 32 are released. Further, each time the reinforcing bar S is bent, the clamper 20 temporarily releases the clamp of the reinforcing bar S and corrects the posture of the reinforcing bar S so as to follow the guide surface 30. The rebar S after the completion of processing is discharged onto the discharge chute 70 and taken out to the outside.

  The reinforcing bar S may be discharged to the outside simply by bending both ends at a right angle (solid line in FIG. 13A), and both ends are folded back to about 180 °, and the whole is formed into a U shape. May be discharged to the outside (FIG. 11). Moreover, you may bend into another arbitrary shape as needed.

Other embodiments

  In the above description, by providing the rebar S automatic supply device, a fully automatic bending device can be provided, and the rebar S can be continuously bent. Also, two or more rebars S can be supplied to the bending units 10 and 10 to perform a plurality of simultaneous bending processes.

  The power point roll 12 of the bending unit 10 can have a groove 12b at the lower end (FIG. 15). When the rebar S is bent by turning the force point roll 12 around the fulcrum roll 11, the rebar S is guided by the groove 12 b and along the swivel table 13, so that the rebar S is bent more reliably. In addition, oil grooves 12c, 12c... Are provided in multiple stages on the outer periphery of the support shaft 12a of the power point roll 12, and a vertical hole 12d is provided in the center of the support shaft 12a. Further, the support shaft 12a is provided with radial through holes 12e, 12e..., And each through hole 12e communicates with the oil groove 12c and the vertical hole 12d. Therefore, by supplying grease or lubricating oil from the upper end of the support shaft 12a to the vertical hole 12d, the power point roll 12 can smoothly rotate around the support shaft 12a. The support shaft 12a is fixed to the turning table 13 by a set screw 13d. When the power point roll 12 needs to be replaced due to the size of the reinforcing bar S, it is necessary to remove the support shaft 12a from the turning table 13. The oil groove 12c at the lower end of the support shaft 12a supplies oil to the outer periphery of the support shaft 12a to facilitate the extraction of the support shaft 12a. Further, the set bolt 11b of the fulcrum roll 11 is attached eccentrically with respect to the shaft 11a to prevent loosening.

  Since the present invention can perform high-quality bending with less torsion and can improve production efficiency by automation, it can be widely and suitably applied to applications of bending reinforcing bars.

S ... rebar 10 ... bending unit 11 ... fulcrum roll 12 ... power point roll 13 ... turning table 20 ... clamper 30 ... guide surface 30a ... auxiliary guide 30b ... fixed guide

Claims (4)

  The bending unit includes a pair of bending units whose distances can be adjusted, and a clamper disposed between the bending units. The bending units each include a fulcrum roll, a swivel table that swivels around the fulcrum roll, and the swivel A power point roll on the table, and each swivel table forms a common diagonally upward guide surface during bending, and the clamper is supported at both ends by the fulcrum roll and is on the guide surface. An apparatus for bending a reinforcing bar, wherein the reinforcing bar clamps the reinforcing bar and the bending unit bends the reinforcing bar along the guide surface.   2. The reinforcing bar bending apparatus according to claim 1, wherein the bending units are respectively mounted on a carriage that moves back and forth opposite to each other on a straight line.   The reinforcing bar bending apparatus according to claim 1 or 2, wherein an auxiliary guide forming the same surface as the guide surface is attached to each carriage.   The reinforcing bar bending apparatus according to any one of claims 1 to 3, wherein a fixed guide that forms the same plane as the guide surface is provided at a lower portion of each bending unit.

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