JP2021109181A - Twist preventive device of work, and reinforcement bending device equipped with the same - Google Patents

Abstract

To prevent the twist of work W due to the twist of a reinforcement S at bending.SOLUTION: A reinforcement bending device has left and right vendor units 10, 10, left and right supply units 20, 20, a twist preventive device of work by left and right retaining members 31, 31. Each retaining member 31 is attached to a moving guide 25 of the supply unit 20.SELECTED DRAWING: Figure 1

Description

The present invention relates to a work twist prevention device useful for manufacturing a work such as a frame shape or a gate shape by bending a linear reinforcing bar, and a reinforcing bar bending processing device including the same.

While shortening the mutual spacing between the pair of left and right bender units that can be adjusted, bending straight reinforcing bars in the same direction from both tips can create hoop-shaped workpieces such as frames and portals. A reinforcing bar bending device for that purpose is known (for example, Patent Document 1). Further, a supply unit for supplying reinforcing bars to the left and right vendor units is also known (for example, Patent Document 2), and by combining both, a high-performance automatic processing system having excellent productivity can be configured. ..

Japanese Patent No. 5692714 Japanese Patent No. 5622191

According to the conventional technique, if both tips of a straight reinforcing bar are bent through the left and right bender units, the work may sometimes be twisted and the work may not have a correct frame shape or a portal shape. There was a problem.

Therefore, an object of the present invention is to prevent twisting of the work, which can effectively prevent twisting of the work by introducing a pressing member that presses the tip side of the bent reinforcing bar in view of the problem of the prior art. An object of the present invention is to provide an apparatus and a reinforcing bar bending apparatus equipped with the apparatus.

The configuration of the invention of claim 1 for achieving such an object comprises left and right pressing members, and the pressing members are bent on the tip side of the reinforcing bar bent via the left and right bender units on a common reference plane. The gist is to press in the radial direction at the same time.

The inclination of the pressing surface that presses the reinforcing bar may be adjustable, and each pressing member may be attached to the tip of a movable guide in the supply unit that supplies the reinforcing bar to the vendor unit.

The configuration of the invention of claim 4 includes left and right bender units whose intervals can be adjusted, left and right supply units whose intervals can be adjusted, and an anti-twisting device for the work according to any one of claims 1 to 3. The gist of the present invention is that the supply unit supplies linear reinforcing bars to the vendor unit, and the holding member is attached to each of the supply units.

According to the configuration of the invention of claim 1, the left and right pressing members are generated in the reinforcing bar by pressing the tip end side of the bent reinforcing bar via the bender unit in the radial direction on a common reference plane. It is possible to appropriately correct the twist and prevent the work from twisting. The twist in the reinforcing bar occurs in the straight portion between the two bending positions by the left and right bender units, and the longer the straight portion, the more remarkable the influence of the twist. Therefore, it is preferable that the pressing member is operated immediately after the first bending process in which the straight portion of the reinforcing bar is the longest. However, the reference plane referred to here means a plane that defines an appropriate bending direction of the reinforcing bar by each vendor unit, and the common reference plane means a reference plane common to the left and right vendor units. Further, the tip end side of the bent reinforcing bar means the tip end side of the reinforcing bar that is swirled and driven by each vendor unit during the bending process of the reinforcing bar. The left and right pressing members shall press the tip side of the bent reinforcing bar at the same timing.

Each pressing member can press the reinforcing bar most appropriately by adjusting the inclination of the pressing surface that presses the reinforcing bar. However, the pressing member at this time is formed in a block body having an oblique pressing surface.

When each pressing member is attached to the movable guide in the supply unit, the reinforcing bar can be pressed by using the operation of the movable guide, and it is not necessary to provide a special drive mechanism. The movable guide at this time is closed to supply the linear reinforcing bar to the bender unit at an appropriate position, and is opened and retracted in the direction away from the bender unit during bending by the bender unit, for example.

According to the configuration of the invention of claim 4, the vendor unit can bend the linear reinforcing bar supplied through the supply unit a plurality of times to make a predetermined work, and the work twist prevention device can be used. It is possible to correct the twist of the reinforcing bar and prevent the twist of the work. The distance between the left and right vendor units and the left and right supply units can be adjusted independently of each other.

Schematic side view of the main part configuration Structural explanatory view of movable guide and holding member Schematic operation explanatory diagram (1) Schematic operation explanatory diagram (2) Schematic operation explanatory diagram (3) Schematic operation explanatory diagram (4) Schematic operation explanatory diagram (5) Schematic operation explanatory diagram (6)

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

The reinforcing bar bending apparatus includes left and right bender units 10 and 10, left and right supply units 20 and 20, and left and right pressing members 31 and 31 for a work twist prevention device attached to each supply unit 20. (Fig. 1). However, in FIG. 1, the vendor units 10, 10 and the supply units 20, 20 are incorporated in a frame (not shown) perpendicular to the paper surface of FIG. 1, and only one set of each is shown. The vendor units 10, 10 and the supply units 20, 20 can be moved left and right within the gantry frame via individual moving means, and the mutual spacing can be adjusted.

The bender unit 10 is set obliquely upward and includes a fulcrum pin 11 and a force point pin 12 that swivels around the fulcrum pin 11 via a circular swivel table 13. The fulcrum pin 11 is fixed to the shaft end of the support shaft 11a penetrating the center of the swivel table 13, and the swivel table 13 is connected to the tip of the hollow shaft 13a that houses the support shaft 11a. The hollow shaft 13a is rotatable and axially slidable with respect to the fixed housing 14, and the support shaft 11a is relatively rotatable and axially immovable with respect to the hollow shaft 13a. The hollow shaft 13a is rotationally driven in the forward and reverse directions by a drive motor (not shown), and the support shaft 11a can be reciprocally driven in the axial direction via an air cylinder (not shown) attached to the rear end. The vendor unit 10 is provided with an auxiliary table 15 integrated with the vendor unit 10 via support members 15a, 15b, and 15b, and the auxiliary table 15 covers a required range around the vendor unit 10. There is.

When the reinforcing bars S and S are supplied onto the swivel table 13 so as to be hung on the fulcrum pin 11, the bender unit 10 rotates the swivel table 13 to swivel the force point pin 12 around the fulcrum pin 11. The reinforcing bars S and S can be bent at once along the swivel table 13 and the auxiliary table 15. That is, in the bender unit 10 being bent, the upper surface of the swivel table 13 coincides with the upper surface of the auxiliary table 15, and the upper surfaces of the swivel table 13 and the auxiliary table 15 are used as reference surfaces for bending. Further, the bender unit 10 is lowered as a whole so that the upper ends of the fulcrum pin 11 and the force point pin 12 are lower than the auxiliary table 15 via the air cylinder at the rear end of the support shaft 11a, and the reinforcing bars S and S have been bent. Work can be discharged downward.

The supply unit 20 is configured by providing a rotary disk 23 on the downstream side of the chain conveyor 21 with attachments 21a, 21a .... Pockets 23a, 23a ... For accommodating the reinforcing bars S are formed at equal pitches on the outer periphery of the rotating disk 23, and a slope 22a formed on the frame 22 is formed between the chain conveyor 21 and the rotating disk 23. Have been placed. Further, in the vicinity of the rotating disk 23, a fixed guide 24 and a movable guide 25 to be mounted on a frame (not shown) other than the frame 22 are arranged. The inner surface side of the fixed guide 24 is formed in an arc shape that matches the outer circumference of the rotating disk 23, and the movable guide 25 swings up and down around an intermediate support pin 25b via an air cylinder 25a connected to the rear end. It is movable.

The movable guide 25 is formed such that the upper side of the outer peripheral side of the rotating disk 23 below the support pin 25b is smoothly continuous with the arc portion 25c having a diameter larger than that of the rotating disk 23 and the straight portion 25d. 1 and 2 (A). The tip of the straight portion 25d is formed on a trapezoidal protruding portion 25e, and a downward flag portion 25f is formed. The flag portion 25f has a round hole 25g and a long hole 25h for attaching the pressing member 31. It is formed.

The pressing member 31 is an L-shaped block body when viewed from the side (FIGS. 1 and 2 (B)), and the outside of the bent portion is largely notched diagonally. However, FIG. 2B also shows a front view and a right side view of the pressing member 31. Screw holes 31a and 31a for mounting are formed on the tip surface of one side of the pressing member 31, and the tip surface of the other side is formed on the oblique pressing surface 31b. Therefore, the pressing member 31 adjusts the inclination of the pressing surface 31b with respect to the flag portion 25f of the movable guide 25 via a bolt (not shown) screwed into the screw holes 31a and 31a using the round hole 25g and the elongated hole 25h. It can be fixed (solid line in FIG. 2C, alternate long and short dash line).

The left and right supply units 20 and 20 simultaneously operate the respective chain conveyors 21 (in the direction of arrow K1 in FIG. 1) so that the linear reinforcing bars S, S ... Are hung on the chain conveyors 21 and 21. It can be carried on the slopes 22a and 22a in sequence. Further, the supply units 20 and 20 are operated intermittently by synchronizing the rotating disks 23 with each other corresponding to one pitch of the pockets 23a, 23a ... (in the direction of arrow K2 in the figure), via the pockets 23a, 23a. , Reinforcing bars S, S ... Can be carried out one by one from the lower ends of the slopes 22a and 22a and supplied to the left and right bender units 10 and 10. At this time, the movable guides 25 and 25 extend the air cylinder 25a and close the tip side toward the rotating disk 23 (in the direction of arrow K3 in the figure), and the reinforcing bars S from the rotating disks 23 and 23 are used as the bender unit. It can be reliably guided on the fulcrum pins 11 and 11 of 10 and 10.

When the reinforcing bars S are supplied to the vendor units 10 and 10, the power point pins 12 of each vendor unit 10 are retracted upward. Further, as shown in FIG. 1, when the two reinforcing bars S and S are supplied to the vendor units 10 and 10, the rotating disks 23 and 23 are rotated in synchronization by two pitches.

The overall operation procedure including the pressing members 31 and 31 as the work twist prevention device will be described as follows, for example.

First, it is assumed that the linear reinforcing bars S and S are supplied to the left and right vendor units 10 and 10 via the supply units 20 and 20 (FIGS. 3 (A) and 7 (A)). However, FIG. 3 (A) is a schematic front view of the vendor units 10 and 10 viewed from the axial direction, and FIG. 7 (A) is a schematic view of the right side surface of FIG. 3 (A) showing the auxiliary table 15 omitted. Is. The same applies to FIGS. 3 (B) and 7 (B) and thereafter.

In FIG. 3A, a stopper 16 for preventing the reinforcing bars S and S from jumping up during bending is provided immediately above the inside of each vendor unit 10. The stopper 16 is fixed on the auxiliary table 15 so as to project downward onto the swivel table 13. The left and right auxiliary tables 15 and 15 are set to the same height, and in each vendor unit 10, the swivel table 13 is set to the same level as the auxiliary table 15. Further, the reinforcing bars S and S are supplied between the fulcrum pins 11 and the stopper 16 of each vendor unit 10 after setting the vendor units 10, 10 and the supply units 20 and 20 at appropriate intervals D1 and D2, respectively.

Subsequently, the air cylinder 25a of each supply unit 20 is shortened (FIG. 7B), the movable guide 25 that was closed when the reinforcing bars S and S are supplied is opened, and the pressing member 31 is pulled away from the bender unit 10. After that, the power point pins 12 and 12 of the vendor units 10 and 10 are swiveled outward around the fulcrum pins 11 and 11 (in the direction of the arrow in FIG. 3B) to move the tip sides of both the reinforcing bars S and S at once. (Fig. 3 (B), Fig. 7 (C)). At this time, each stopper 16 can engage with the reinforcing bars S and S from above in the immediate inner side of the fulcrum pin 11 of the corresponding vendor unit 10 to prevent the reinforcing bars S and S from moving upward.

Next, when the power point pin 12 is returned to the original position via the swivel table 13 of each vendor unit 10 (in the direction of the arrow in FIG. 3C), the straight lines of the reinforcing bars S and S between the vendor units 10 and 10 are straight. Due to the twist generated in the portion, a gap x may be formed between the downward tips of the reinforcing bars S and S (FIG. 7 (D)). On the other hand, the vendor units 10 and 10 are moved so as to be close to each other (in the direction of the arrow in FIG. 4A) in preparation for the second bending process, and are set at a predetermined interval D1a <D1.

Subsequently, when the movable guide 25 is closed via the air cylinder 25a of each supply unit 20 (FIG. 7 (E)), the tip sides of both the reinforcing bars S and S are placed on the auxiliary tables 15 and 15 by the pressing members 31 and 31. The twist of the reinforcing bars S and S can be corrected by pressing in the radial direction (FIG. 4 (B)). However, in FIG. 4B, a schematic view of the lower surface is displayed together with the schematic view of the front surface. Further, at this time, since the upper surfaces of the swivel table 13 and the auxiliary table 15 of each vendor unit 10 are reference surfaces of the same level, the left and right pressing members 31 and 31 use the reinforcing bars S and S as the left and right vendor units 10. It can be pressed simultaneously on 10 common reference planes. After that, the movable guides 25 and 25 are opened via the air cylinders 25a and 25a (FIG. 7 (F)), and the pressing members 31 and 31 are retracted (FIG. 4 (C)).

Next, the second bending process of the reinforcing bars S and S is performed via the bender units 10 and 10 (FIGS. 5 (A) and 8 (A)) to make the gate-shaped workpieces W and W. That is, also at this time, each vendor unit 10 swivels the force point pin 12 around the fulcrum pin 11 via the swivel table 13 (in the direction of the arrow in FIG. 5A), and rebars S and S are swiveled around the swivel table 13. The auxiliary table 15 can be bent downward at once along the reference surface of the upper surface, and the stopper 16 prevents the reinforcing bars S and S from jumping up during the bending process.

After that, the power point pins 12 of each vendor unit 10 are returned to their original positions (in the direction of the arrow in FIG. 5B, FIG. 8B), and the workpieces W and W are carried out from the vendor units 10 and 10 (. 5 (C) and 8 (C). However, the work W and W can be carried out downward by simultaneously lowering each vendor unit 10 so that the fulcrum pin 11 and the force point pin 12 are lower than the auxiliary table 15, and each vendor unit 10 can be carried out. , W is immediately returned to the original height position after being carried out (FIG. 8 (C)).

Subsequently, the bender units 10 and 10 were moved to their original positions to set the interval D1 (FIG. 6 (A)), and each movable guide 25 was closed via the air cylinder 25a (FIG. 6 (B), FIG. 8). (D)), the reinforcing bars S and S for the next workpieces W and W are supplied to the bender units 10 and 10, and the operations of FIGS. 3 (A) and 7 (A) and thereafter are repeated.

Other embodiments

The bender unit 10 may bend one reinforcing bar S instead of bending two reinforcing bars S and S at a time. At this time, the gap x in FIG. 7D based on the twist of the reinforcing bar S is generated between the tip of the reinforcing bar S after bending and the swivel table 13 and the auxiliary table 15 of the bender unit 10. Even when the two reinforcing bars S and S are bent, the gap x may occur between the tip of the lower reinforcing bar S and the swivel table 13.

The work W for bending the reinforcing bar S may have any shape including a frame shape instead of a gate shape. For example, the work W includes a bending angle of more than 90 ° or less than 90 °, asymmetrical shape, a bending position at an odd number, a bending process of 3 times or more by the bender unit 10, and the like. There may be.

The pressing operation of the reinforcing bar S by the pressing members 31 and 31 is preferably performed on the auxiliary tables 15 and 15 as shown in FIGS. 4 (B) and 7 (E). It is not impossible to carry out on 13 and 13. Further, the pressing members 31 and 31 may execute the pressing operation after the first or second and subsequent bending operations of the reinforcing bar S a plurality of times. Further, each pressing member 31 may be driven via an arbitrary driving member other than the movable guide 25.

Since the present invention can prevent twisting of the work, it can be widely and suitably applied to applications in which high-quality work is required to be efficiently produced.

S ... Reinforcing bar 10 ... Vendor unit 20 ... Supply unit 25 ... Movable guide 31 ... Pressing member 31b ... Pressing surface

Patent applicant Cadac Co., Ltd.

Claims (4)

The work is provided with left and right pressing members, and the pressing members simultaneously press the tip end side of the bent reinforcing bar on a common reference surface in the radial direction via the left and right bender units. Prevention device. The twist prevention device for a work according to claim 1, wherein each of the pressing members has an adjustable inclination of a pressing surface that presses a reinforcing bar. The work twist prevention device according to claim 1 or 2, wherein each of the pressing members is attached to the tip of a movable guide in a supply unit that supplies a reinforcing bar to the vendor unit. The left and right bender units whose intervals can be adjusted, the left and right supply units whose intervals can be adjusted, and the work twist prevention device according to any one of claims 1 to 3, are provided, and the supply unit is the vendor. A reinforcing bar bending device characterized in that a linear reinforcing bar is supplied to a unit, and the holding member is attached to each of the supply units.

Images