JPH02197337A - Method and apparatus for bending reinforcing steel - Google Patents

Abstract

PURPOSE:To quickly and automatically form by bending a product having the desired shape and size at good accuracy by working a bending apparatus in order according to beforehand programed feeding rate, bending direction, bending angle and working order. CONSTITUTION:A net-like flat assembled reinforcing steel 1 is held with a holding device 49 and laid on a table 9 so that the front end part thereof protrudes by the prescribed quantity, and by working a cylinder 15, a holding beam 10 and upper bending beam 20 are descended to hold the reinforcing steel 1. In the case of bending the reinforcing steel 1 upward under this condition, by working a cylinder 34, a lower bending beams 23 is rotated upward by the prescribed angle as making an axis of the point A to bend the protruding part of the reinforcing steel 1. Further, in the case of bending this downward, the lower bending beam 23 is descended at the position, where it does not interfere with the bending movement and the upper bending beam 20 is rotated downward by the prescribed angle as making an axis of the point B with a cylinder 21 to bend the protruding part of the reinforcing steel 1. Successively, the reinforcing steel 1 protrudes from the table 9 by the prescribed length in order and the prescribed bending operation is executed in order.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a linear reinforcing bar or a net-like flat assembly reinforcing bar 1 consisting of vertical bars 1a and horizontal bars 1b as shown in FIGS. 12 and 13, for example. The present invention relates to a method and an apparatus for bending, for example, a shape shown in FIGS. 14 to 16 by cold working.

[Conventional technology]

Traditionally, linear reinforcing bars have been bent manually using bending machines.

In addition, vertical bars 1 obtained by bending linear reinforcing bars into a predetermined shape
A and a transverse reinforcement 1b were combined to make a bent-shaped mesh-like assembly reinforcing bar 1.

[Problem that the invention seeks to solve]

Conventionally, for example, when making the bent and reticulated assembly reinforcing bars 1 for the reinforced concrete groove block 52 shown in FIG. 16, the above method has poor bending accuracy, and
Work efficiency was also very poor.

[Means for solving problems]

In order to eliminate these drawbacks, this invention has developed a reinforcing bar that can freely set the bending angle of the reinforcing bar, can freely select between normal bending and reverse bending, and has a mechanism for feeding the reinforcing bar to a predetermined length. Using a folding device, the folding device was sequentially operated according to a preprogrammed feed amount, folding direction, folding angle, and operation order to produce a folded product in a predetermined shape.

Further, as Mf for this purpose, a presser beam is provided on the upper side of the front surface of the table so as to be movable up and down, and an upper bending beam that is rotatable about a point in front of the front end surface of the table is provided on the front side of the presser beam. A lower bending beam is provided which is rotatably mounted, movable up and down, and rotatable about a point in front of the front end surface of the upper bending beam.

In addition, a reinforcing bar feeding device with a clamping mechanism for reinforcing bars is installed at the rear of the top surface of the table, and is used to determine the normal bending, reverse bending, bending directions and bending angles of reinforcing bars, the amount of return of reinforcing bars, and the feeding and bending operations of reinforcing bars. An operating device was provided that allowed the sequence to be programmed.

[Effect]

Using the device of this invention, flat rope-shaped assembly reinforcing bars, etc.
To bend the reinforcing bars into a predetermined shape, first place the reinforcing bars on a table with the front end of the reinforcing bars protruding from the front end of the table by a predetermined distance, and then press the reinforcing bars with a presser beam located above the front of the table.

Next, in the case of normal bending, that is, when bending the reinforcing bars upward as shown in Fig. 14, as shown in Figs. Rotate it upward by a predetermined angle.

In the case of reverse bending, that is, when bending the reinforcing bars downward as shown in Figure 15, as shown in Figure 11, hold down the reinforcing bars with a holding beam and lower the lower bending beam to a position where it does not interfere with the bending of the reinforcing bars. Then, rotate the upper bending beam downward by a predetermined angle.

The reinforcing bars are fed by controlling the amount of advance of a clamping member that clamps the rear end of the reinforcing bars.

In addition, reinforcing bar bending and feeding can be performed by individual inching operations, but when automatically bending reinforcing bars, the bending direction and bending angle of normal bending and reverse bending of reinforcing bars, the feed amount of reinforcing bars, and the feeding amount of reinforcing bars The operations and the order of the bending operations are programmed in advance in the operation instruction device, and the operations are sequentially performed according to the operation order to obtain a folded product of a predetermined shape.

〔Example〕

1 to 8 show one embodiment of an apparatus for carrying out the method of the invention.

In Figures 2 to 4, 2 is a frame, and frame 2
A feeding member 3 is disposed on a rail portion 2a extending in the front-rear direction at the center of the upper part of the vehicle so as to be freely fed by wheels 4. A block 6 that moves up and down by the action of a cylinder 5 is attached to the feeding member 3, and several magnets 7 are suspended from the block 6. By excitation and demagnetization, the magnet 7 can attract or separate the flat mesh-like assembly reinforcing bars 1. In addition, in order to lift only a part of the assembled reinforcing bars 1 among the assembled reinforcing bars 1 that are stacked in large numbers, the strength of the magnetic force of the magnet 7 is adjusted as appropriate.

Reference numeral 8 denotes a trolley, on which a large number of mesh-shaped assembly reinforcing bars 1, which are materials to be bent, are loaded and placed so that they can be brought under the magnet 7 located at the rear.

Reference numeral 9 denotes a table on which assembled reinforcing bars 1, each serving as a material to be bent, are placed one by one. Magnet 7 is on table 9.
The flat assembled reinforcing bars 1 are carried one by one from the trolley 8 by the action of the transport member 30.

As shown in FIG. 1, a presser beam 10 having a flat lower surface is provided on the upper front side of a table 9 having a horizontal upper surface so as to be movable up and down.

As shown in FIGS. 6 and 7, both end members 1 of the presser beam 1a
0a is guided by guide members 12 of a frame 11 provided on both sides near the front of the table 9 so as to be movable in the vertical direction. At the lower end of both end members 10a,
The pin hinge sequentially connects the link 13 and the rotating member 14.
lever part i4a, piston rod 15 of cylinder 15
a are connected, and both ends 10a1 and the presser beam 10 can move up and down by the operation of the cylinder 15. 16 is a shaft for the rotating member 14, 17 is a bearing, 18
is a bracket that swingably supports a part of the cylinder 15.

As shown in Fig. 1.5.7, the center is at a point B1, that is, the axis 19, which is slightly in front of the front end surface of the table 9 by several mm to several tens of ITIITl and above the top surface of the table 9. Upper bending beam 20 rotatable as
is rotatably attached to the front side of the presser beam 10. The shaft 19 is arranged on the front side of the presser beam 10 in the bracket 10b between the presser beam 10 and its both end members 10a. Brackets 20a are fixed to both upper surfaces of the upper bending beam 20, and a piston rod 21a of the cylinder 21 is attached to the rear side of the bracket 20a by a pin hinge. 22 is the cylinder 21
This is a bracket that swingably holds the As shown in FIG. 1, when the piston rod 21a is retracted, the lower surface plane of the presser beam 10 and the upper bending beam 2
The bottom plane of 0 is flush with the other plane. Also, axis 1
9, that is, the rotational center point B of the upper bending beam 20 is located at a position included within the lateral extension plane of the lower surface plane of the upper bending beam 20. The upper bending beam 20 is rotated around point B by the operation of the cylinder 21, and the rotation angle β in the reverse bending direction, that is, the rotation angle β in the counterclockwise direction in FIGS. It is determined by the advance distance of the piston rod 21a which is determined by the action of the position detector 36.36a.

1st. 5. As shown in Figure 6, the lower bending beam 23
is vertically movable in front of the table 1, and is centered on a point A that is slightly in front of the front end surface of the upper bending beam 20, such as several mm to several tens of mm, and below the lower surface of the upper bending beam 23. It is rotatably provided.

A guide member 24 is provided in front of the vertical guide member 12 of the frame 11 and guides in the vertical direction parallel to the guide member 12. A guide block 25 is attached to the guide member 24 so as to be vertically movable. There is. The lower end of the guide block 25 is provided with a pin hinge in order.
The link 26, the lever part 27a of the rotating member 27, and the piston rod 28a of the cylinder 28 are connected, so that the guide block 25 can move up and down by the operation of the cylinder 28. 29 is a shaft for the rotating member 27;
0 is a bearing, 31 is a bracket that swingably supports a part of the cylinder 28, and 32 is a stopper device for regulating the rotation limit of the rotating member 27 and regulating the upward limit of the guide block 25.

A shaft 33 is provided at point A in a part of the guide block 25, and as shown in FIG. 5, the lower bending beam 23 is rotatably attached to the shaft 33 via a bracket portion 23a. .

34 is a cylinder for rotating the lower bending beam 23, and the tip of the piston rod 34a of the cylinder 34 is attached to the lower surface of the lower bending beam 23 to rotate the lower bending beam 23.
It is rotatably mounted on the The lower bending beam 23 is rotated about point A by the operation of the cylinder 34, but the rotation α in the positive bending direction, that is, the first . The rotation angle α in the clockwise direction in FIG. 9 is determined by the advancing distance of the piston rod 34a, which is determined by the action of rotational position detectors 40, 40a, and 40b, which will be described later.

As shown in FIGS. 1 and 5, a bracket 35 is fixed vertically to the bracket part 10b of the presser beam 1o, and the bracket 35 has several pieces of metal for detecting the rotational position of the upper bending beam 20. A position detector 36,362 such as a limit switch is installed. On the other hand, an arcuate bracket 37 is fixed to the bracket 20a of the upper bending beam 20, and a striker 38 is attached to the bracket 37 so that its position can be adjusted. and a position detector 36. By the action of '3.6a, the rotational position of the upper bending beam 20 can be detected and the next operation can be instructed.

Further, a bracket 39 is fixed to the lower end of the guide block 25, and the bracket 39 is equipped with several position detectors 40° 40a, 40b such as limit switches in order to detect the rotational position of the lower bending beam 23. is installed. On the other hand, the lower part bends and the bracket 23a of the one member 23
An arc-shaped bracket 41 is fixed to the bracket 41, and a striker 42 is attached to the bracket 41 so that its position can be adjusted. and a position detector 40. 40a, 4
By the action of 0b, the rotational position of the lower bending beam 23 can be detected and the next operation can be instructed.

Second. 3. As shown in Figure 8, table 9
A plurality of long groove portions 9a are provided in the front-rear direction.

A ball screw 43 extending in the front-rear direction is rotatably attached to the center portion below the top surface of the table 9. 4
4 is a bearing, 45 is a pulley, and 46 is a timing belt wound around the pulley attached to a motor 47.

The ball screw 43 is attached to a flat block 48 extending in a direction perpendicular to the plane of the paper in FIG. It is slidably attached to a guide rod (not shown) attached between the front and rear ends of the table 9 in parallel with the ball screw 43 on a horizontal plane. Therefore, by rotating the motor 47, the block 48 can be arbitrarily moved in the front and rear directions.

In each long groove 9a of the table 9, a clamping device 49 capable of clamping the end of the assembled reinforcing bar 1 is provided on the upper surface of the flat (jl) block 48. Each clamping device 49 is capable of opening and closing a tongue portion 51 by operating a cylinder 50.

Therefore, the assembled reinforcing bars 1 are
If the motor 47 is rotated with the rear end portion sandwiched, the flat block 48 and the clamping device 49 move back and forth.

At that time, for example, a pulse motor is used as the motor 47, and the rotation amount of the motor 47 is appropriately controlled depending on the number of command pulses, so that the table 9 held by the clamping device 49 is
The upper assembly reinforcing bar 1 can be moved forward by a desired distance. Note that the motor 47, ball screw 43, block 48, clamping device 49, etc. constitute a reinforcing bar feeding device.

As shown in FIGS. 9 and 11, the protrusion distances a and d of the assembled reinforcing bars 1 to be projected forward from point A or point B can be determined at any point through which the assembled reinforcing bars 1 on the table 9 pass, for example, on the presser beam 10. Point 0 below the rear end face can be designated as a reference point and controlled.

(12) That is, since the distance b1e from point 0 to point A or point B is constant, when protrusion distances a and d are required, the distances C=a+b and f=d+e from point 0 are specified. In addition,
A limit switch (not shown) is used as a device to detect that the tip of the assembled reinforcing bar 1 is located at point 0.
It is also possible to use the limit switch by placing it in the long groove 9a of the table 9 at the point 0 and having the detection part of the limit switch protrude from the top surface of the table 9. It is also possible to use a phototube device consisting of a light emitter and a light receiver arranged in the same direction.

Select the forward bending and reverse bending directions and bending angles α and β of the assembled reinforcing bar 1, the feed amount of the assembled reinforcing bar 1, and the feeding operation and bending operation order of the assembled reinforcing bar 1 using push buttons or numeric keys as appropriate. An operating device such as an operating panel (not shown) on which programming can be performed and operation instructions can be given is arranged near the main body of the reinforcing bar bending device.

Next, the operation of this reinforcing bar bending device will be explained.

First, only the topmost assembled reinforcing bar 1 is lifted from the cart 8, which carries a large number of stacked reinforcing bars 1, by the action of the magnet 7 and the cylinder 5, and placed on the table 9.

Next, the rear end portion of the assembled reinforcing bar 1 on the table 9 is held between the clamping devices 49. At this time, as shown in FIG. 1, the presser beam 10 is lifted from the upper surface of the table 9 so that the reinforcing bar assembly 1 can pass under it, and the tip of the reinforcing bar assembly 1 is from point 0. Also place it at the back. In addition, the upper bending beam 20 and the lower bending beam 2
3 in the position shown in FIG.

Next, the motor 47 is operated to cause the tip of the assembled reinforcing bar 1 to protrude from point A or point B by a desired distance. In addition,
These protruding dimensions a and d are the distance c from the reference point O.
, f, and is naturally determined by the amount of rotation of the motor 47.

In order to straighten the reinforcing bars, as shown in FIG.
4 to rotate the lower bending beam 23 by a predetermined angle α around point A. Then, the folded state shown in FIG. 14 is obtained. When the assembled reinforcing bar 1 is to be bent by 90", the lower bending beam 23 is rotated by 90 degrees, as shown in FIG.

When performing reverse bending of reinforcing bars, as shown in FIG. 11, actuate the cylinder 28 to lower the lower bending beam 23 to the lower limit position where it will not interfere with the bending operation, and then actuate the cylinder 21. The upper bending beam 20 is rotated by a predetermined angle β about point B. Then, the first
A bent state as shown in FIG. 5 is obtained. Note that when bending, if the bending state is only slightly smaller than the desired angles α and β due to springback, take into account the bending error caused by this springback and bend the angle slightly smaller than the desired angles α and β. Lower bending beam 23 at a slightly larger angle
and the upper bending beam 20 is rotated.

When obtaining assembled reinforcing bars 1 that are complicatedly bent as shown in Fig. 16, the feeding amount of the reinforcing bars should be
The bending direction and bending angle of forward bending and reverse bending, the feeding operation of reinforcing bars, the vertical movement of the presser beam 10, the vertical movement of the lower bending beam 23, and the operation of the bending operation by the upper bending beam 20 and the lower bending beam 23 The order is programmed using an operating device (not shown), and the bending is performed one by one according to the instructions.

When obtaining the bent shape shown in Fig. 16, first,
As shown in FIG. 9, the front end of the assembled reinforcing bar l is made to protrude from point A by a distance a, and the presser beam 10 and upper bending beam 20 are
The lower bending beam 23, which is at its upper limit, is rotated by an angle α in the clockwise direction in FIG.
Get C.

When the bending of the first bending portion IC is completed, the lower bending beam 2
Rotate the top surface of 3 to the original horizontal position, and then remove the presser beam 10.
After the upper bending beam 20 is raised and the motor 47 is operated to move the assembled reinforcing bar 1 forward by a distance ag, a part of the assembled reinforcing bar 1 is held down by the presser beam 10. Next, the 11th
As shown in the figure, after lowering the lower bending beam 23 to a lower position where it does not interfere with the bending process, the upper bending beam 20 is moved counterclockwise around point B at an angle β (16 In the figure, the second bent portion 1d is obtained by reverse bending by rotating by β=α).

Once the second bent portion 1d is obtained, the lower surface of the upper bending beam 20 is rotated to its original horizontal position, the presser beam 10 and the upper bending beam 20 are raised, and the lower beam 23 is also returned to its original raised position. After activating the motor 47 to advance the bent assembled reinforcing bar 1 by a further distance, a part of the assembled reinforcing bar 1 is held down by the presser beam 10. Next, as shown in FIG. 9, the lower bending beam 23 is rotated clockwise around point A by an angle γ=45° to obtain the third bent portion 1e.

Thereafter, the above operations are repeated as appropriate. That is, it is further advanced by a dimension i and bent by an angle δ=45° to obtain the fourth bent portion 1f, and further advanced by a dimension j and bent by an angle δ−45° to form a fifth bend. Part 1g
is further advanced by the dimension i and bent forward by an angle γ=45° to obtain the sixth bent portion 1h.Further advanced by the dimension i and reversely bent by the angle β=α to obtain the seventh bent portion. got 11,
It is further advanced by a dimension g and bent by an angle α to obtain an eighth bent portion 1j. Note that if the length of the assembled reinforcing bar 1 before bending is set to a length that matches the dimensions and shape shown in FIG. 16, the length of the remaining portion 1 will be the dimension a. Of course,
It is also possible to sequentially bend the assembly reinforcing bars l of a length that allows for a margin in the remaining portion 1k, and after bending the eighth bent portion 1j, cut the remaining portion 1k so that it has the dimension a. .

Incidentally, in the above embodiment, the upper bending beam 20 and the lower bending beam 23 have a structure that does not move in the forward and backward directions. The upper bending beam 2 is adapted to the thickness of the reinforcing bars to be bent.
0 and/or the lower bending beam 23 may be adjusted in the longitudinal direction.

Further, in the embodiment described above, the lower bending beam 23 is provided rotatably about a point A located in front of the front end surface of the upper bending beam 20 and below the lower surface of the upper bending beam 20. It also shows that the upper bending beam 20 is connected to the table 9 in front of the front end surface of the table 9.
In the above example, the lower bending beam 23 is rotated around a point B located above the upper surface to perform reverse bending. Rotate around the center or bend the top and one 20
The lower bending beam A23 can be rotated about a point in front of the front end surface of the table 9, depending on the required bending force. It is also possible to rotate the upper bending beam 20 around a point slightly above the lower surface, or to rotate the upper bending beam 20 around a point slightly lower than the top surface of the table 9. Of course, in this case,
At the start of bending, the upper surface of the lower bending beam 23 is in contact with the lower surface of the assembly reinforcing bar 1 to be bent, but the rotational center point of the lower bending beam 23, that is, the center of the shaft 33, is
0 and above the lower surface of the upper bending beam 20. Furthermore, at the start of bending, the lower surface of the upper bending beam 20 is in contact with the upper surface of the assembly reinforcing bar 1 to be bent. so that it is located below the top surface of the table 9.

〔Effect of the invention〕

As described above, according to the present invention, since the configuration as described in the claims is adopted, even flat assembled reinforcing bars assembled in a net shape can be quickly and accurately shaped into desired shapes and dimensions by cold working. and can be bent automatically. Of course, the reinforcing bars do not have to be turned over, and both normal and reverse bending can be easily performed at any desired angle, which significantly improves efficiency. In particular, since it can be done automatically based on programming, it is more effective when bending into complex shapes.

[Brief explanation of the drawing]

Figures 1 to 8 show one of the apparatuses for carrying out the method of the invention.
1 is a cross-sectional view taken along the line I-I in FIG. 4, FIG. 2 is a plan view, FIG. 3 is a front view, FIG. 4 is a left side view, and FIG. Figure 6 is an explanatory diagram of the lifting device for the presser beam and lower bending beam, Figure 7 is a cross-sectional view taken along the line ■-■ of Figure 6, and Figure 8 is a cross-sectional view of Figure 2. ■-■ line sectional view, Figures 9 and 10 are explanatory diagrams showing different embodiments in a normal bending state, Figure 11 is an explanatory diagram showing an example in a reverse bending state, and Figure 12 is an explanatory diagram showing an embodiment in a reverse bending state. FIG. 13 is a front view of the assembled reinforcing bar shown in FIG. 12, and FIGS. 14 to 16 are different examples of bent assembled reinforcing bars. This shows that. 1... Assembly reinforcing bars, 3... Feeding members, 5. 15.
21゜2B, 34.50...Cylinder, 7...Magnet, 8...Dolly, 9...Table, 10...
Presser beam, 10a...Both end members, 12.24...
Guide member, 19° 33... Axis, beam, 4.0, 4.0 42... Stroke position 20... JZ +': B bending beano 2.225...
Guide block, 3a, 4. Ob...Rimisoto Suiraika, 47...Motor, 4 3...Lower surface 6.36i3 Soji, 38°9...Holding bag

Claims (3)

[Claims] (1) Using a reinforcing bar bending device that can freely set the bending angle of reinforcing bars, freely select between normal bending and reverse bending, and has a mechanism for feeding reinforcing bars to a predetermined length, A reinforcing bar bending method in which a bending device is sequentially operated according to the feed amount, bending direction, bending angle, and work order to create a bent product in a predetermined shape. (2) A presser beam is provided on the upper front side of the table so as to be movable up and down, and an upper bending beam that is rotatable about a point in front of the front end surface of the table is rotatable in front of the presser beam. A reinforcing bar bending device equipped with a lower bending beam that can be mounted and moved up and down, and can be rotated about a point in front of the front end surface of the upper bending beam. (3) A presser beam is provided on the upper front side of the table so as to be movable up and down, and an upper bending beam that is rotatable about a point in front of the front end surface of the table is rotatable in front of the presser beam. A lower bending beam that can be mounted and moved up and down and rotated around a point in front of the front end surface of the upper bending beam is provided, and a reinforcing bar feeding device that has a reinforcing bar clamping mechanism is installed at the rear of the upper surface of the table. A reinforcing bar bending device provided with an operating device capable of programming the bending direction and bending angle of normal bending and reverse bending of reinforcing bars, the feeding amount of reinforcing bars, and the order of feeding operations and bending operations of reinforcing bars.