JPH0122059B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bending apparatus for lattice-shaped reinforcing bars.

Conventionally, when bending lattice-shaped reinforcing bars,
One method has been to use a step bar making machine. However, in this case, since the step bars themselves do not require very strict precision, there was a drawback that if this machine was used to manufacture lattice-shaped reinforcing bars, which require stricter precision, the precision would be poor. In addition, the conventional step bar making machine had the disadvantages of having to check and reset the dimensions every time it was bent, and two people had to do the work.

Another method is to use a dedicated machine instead of applying such a machine. However, the specialized machine in this case is one that automatically feeds the reinforcing bars and continuously bends them to create lattice-shaped reinforcing bars, and the machines are large, costly, and cannot be moved easily. Ta. In addition, conventional dedicated machines of this type clamp both sides of the reinforcing bars with clamping devices, place a fulcrum in the middle of the clamped parts, and move this fulcrum in a direction perpendicular to the reinforcing bars to clamp the reinforcing bars. Both clamp devices are moved to the center in synchronization with the movement of the fulcrum.

In other words, it has a structure in which the fulcrum itself moves.
For this reason, in conventional dedicated machines, the moving mechanism of the fulcrum, which is subject to large forces, must be appropriately robust, resulting in high component costs.Moreover, the rebar clamping device must be synchronized with the movement of the fulcrum. It is also necessary to move the device, which makes the mechanism complicated, and as a result, the cost of the entire device is high.

This invention was made in view of the above circumstances,
The purpose of this is to bend lattice-shaped reinforcing bars that do not require dimension checks, can be processed easily and accurately by one worker, have a simple structure, are small, and are inexpensive, and can be easily relocated. The purpose is to provide processing equipment.

The feature of this invention is that a fulcrum part (fulcrum pin) to which a large force is applied is fixed on a table, and a rebar clamping table placed on both the left and right sides of the fulcrum is moved parallel to the circumferential direction around the fulcrum by a moving mechanism. The point is that it is configured to move.

The present invention will be explained below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, in which reference numeral 1 denotes a work table on which reinforcing bars p are placed. A fulcrum pin 2 having a radius matching the radius of the reinforcing bar is fixed to the center of the upper surface of the table 1.
Further, on the upper surface of the table 1, two reinforcing bar clamping stands 3 and 4, a first and a second reinforcing bar clamping table, are arranged on both the left and right sides of the fulcrum pin 2 and separated from the fulcrum pin 2 by a predetermined distance. The first reinforcing bar clamping stand 3 is for clamping the tip end side of the reinforcing bar P which has already been bent, and the second reinforcing bar clamping stand 4 is for clamping the base end side (proximal side) of the unbent reinforcing bar P. Both clamp stands 3 and 4 are provided so as to be movable along guide grooves 5 and 6 and 7 and 8 on the upper surface of table 1, respectively.

The first reinforcing bar clamp stand 3 has clamp parts 10 and 1 mounted on a triangular base plate 9 along its two sides.
1 is provided so that the reinforcing bar p bent into a mountain shape can be reliably clamped.
That is, on two sides of the base plate 9, there are supports 1 whose ends are rounded to match the R part of the reinforcing bar p.
2, 13 are fixed, and splints 14, 15 are provided along and inside the clamp parts 10, 1.
1 is formed. Among the splints 14 and 15,
The splint plate 14 on the side of the clamp part 10 is fixed to the base plate 9, and the splint plate 14 on the side of the other clamp part 11 is fixed to the base plate 9.
5 is movable, and both clamp parts 10,
In 11, reinforcing bars p are sandwiched between support stands 12, 13 and splints 14, 15, respectively.
Then, the clamp part 11 is secured by tightening the reinforcing bar p sandwiched between the support base 13 and the splint plate 15 by moving the splint plate 15 by a cylinder 16 fixed on the base plate 9. It is designed to be clamped to.

The triangular first reinforcing bar clamping table 3 configured in this way is moved in parallel along the guide grooves 5 and 6 of the table 1 by a parallel link and a hydraulic cylinder (not shown) provided on the lower surface of the table 1. It's getting old.

In addition, the second clamp clamps the reinforcing bar p in the unprocessed part
The reinforcing bar clamping stand 4 has a supporting stand 17 and a splint plate 18.
Cylinder 1 provided on the underside of table 1
9 narrows the width of the groove between the support base 17 and the splint base 18, and securely clamps the reinforcing bar P sandwiched therein. At the same time as clamping, the clamp table 4 itself is moved in parallel along the guide grooves 7 and 8 on the upper surface of the table 1 by the cylinder 19 and a parallel link (not shown).

Here, the guide grooves 5, 6 and 7, 8 on the table 1 guide each reinforcing bar clamp stand 3, 4 to the table 1.
They are formed in a curved shape so that when moved by the cylinders on the lower surface, both move parallel to each other while drawing arcuate trajectories in opposite directions about the fulcrum pin 2.

In this manner, in the same embodiment, the first reinforcing bar clamping unit is a V-shaped clamp portion that removably clamps the V-shaped bent portion of the reinforcing bar in a manner that maintains the V-shape. D, and the second clamp table 4 includes a straight clamp part E that removably clamps the reinforcing bar in the straight unprocessed part in a form that maintains its straight shape, and further includes the V-shaped clamp part D and The linear clamp portion E is formed with support surfaces D1 and E1, respectively, which support the portion of the reinforcing bar to be bent from the inside and provide a bent portion to the reinforcing bar during bending of the reinforcing bar.

Note that the first and second reinforcing bar clamp stands 3, 4
Support rollers 22 are attached to the ends of the support stands 13 and 17, connected by pins 20 and bars 21, respectively. These support rollers 22 are
When the reinforcing bar p is bent at the tip R portion of the support bases 13 and 17, it rotates and supports the reinforcing bar p. Further, 23 is a metal fitting for preventing the reinforcing steel from springing up.

Next, a case in which reinforcing bars p are actually bent into a lattice shape using the apparatus having the above configuration will be described with reference to FIGS. 1 and 2. Note that FIG. 2 shows the situation during processing, and details are omitted.

First, as shown in FIG. 1 or 2A, a reinforcing bar p to be processed is placed on the work table 1, and the reinforcing bar p is set on the reinforcing bar clamping tables 3 and 4 according to its shape. Also, set the metal fittings 23 to prevent reinforcing bars from springing up. Then, the power is turned on, the hydraulic cylinders 16 and 19 are operated, and the reinforcing bar p is clamped by both clamp tables 3 and 4.

Next, a cylinder (not shown) provided on the lower surface of the table 1 is operated, and the cylinder 19 is activated.
By continuing to operate , the first reinforcing bar clamping table 3 is moved in parallel in the direction of arrow A along the guide grooves 5 and 6 of the table 1, as shown in FIG. 1 or FIG. The second reinforcing bar clamping table 4 is moved in parallel along the guide grooves 7 and 8 in the direction of arrow B.

Then, as shown in FIG. 2C, both clamp stands 3 and 4 are stopped at a predetermined position (the end of the guide grooves 5, 6, 7, and 8). By this operation of the clamp tables 3 and 4, the reinforcing bar p is bent using the fulcrum pin 2 as a fulcrum. In this case, the reinforcing bar p is bent to an angle that allows for elastic return (springback).

Then, when the reinforcing bar clamp stands 3 and 4 stop, the cylinders 16 and 19 are opened, the clamping of the reinforcing bar p is released, and then the reinforcing bar hoisting prevention metal fitting 2
3 and return both reinforcing bar clamp stands 3 and 4 to their initial positions (as shown in Figure 2 D). Then, the above operations are repeated to produce a lattice-shaped reinforcing bar.

As described above, according to the above-mentioned apparatus, lattice-shaped reinforcing bars can be manufactured easily and accurately by one worker without the need to check the dimensions. In addition, by forming the first reinforcing bar clamping table 3 on the front side to match the shape of the lattice-shaped reinforcing bars, it is possible to easily position the reinforcing bars and check the machined dimensions at the same time, making it possible to manufacture products with high precision. .

Note that even if multiple reinforcing bars are to be processed, they can be processed at the same time. Furthermore, it is of course possible to move the reinforcing bar clamp stands 3 and 4 one by one instead of moving both at the same time.

As explained above, the present invention fixes a fulcrum pin to which a large force is applied on a table, and uses a moving mechanism to move reinforcing bar clamping tables placed on both the left and right sides of the fulcrum pin in the circumferential direction around the fulcrum pin. Since it is configured to move parallel to
There is no need to provide extra strength to the movable parts, the structure is simplified, and miniaturization and cost reduction can be achieved. In addition, it is possible to bend the reinforcing bars without applying excessive force such as tensile force, and it is possible to manufacture products with high precision and no distortion. In addition, since the clamp table is moved in parallel, the protruding reinforcing bars protruding from the table are not shaken significantly on the proximal side or the tip side, allowing safe machining work.

In particular, according to the present invention, the V-shaped bent part of the reinforcing bar is clamped by the V-shaped clamp part, and the straight unprocessed part of the reinforcing bar is clamped by the straight clamp part, and these clamp parts are used as fulcrums. The structure is such that the pin is moved in parallel so as to draw an arcuate trajectory around the pin, and the part that becomes the supporting surface when bending the reinforcing bar is not only the fulcrum pin but also the V-shaped clamp part and the straight clamp part. Because of this structure, it is possible to bend the reinforcing bar at three locations at the same time.Moreover, after the reinforcing bar is bent in this way, the part bent by the support surface of the straight clamp part is bent halfway in advance. Moreover, since the unprocessed part at the rear end has a straight line shape parallel to the table, it is easier to set it in the correct position during the next bending process. It can be processed continuously and efficiently. In addition, when bending reinforcing bars, both ends of the reinforcing bars are clamped around the fulcrum pin, and then the clamps are moved, so compared to moving the fulcrum pins, the tensile force is applied to the reinforcing bars. It is possible to perform the bending process relatively smoothly without applying excessive force such as pressure or pressing force, and therefore, continuous lattice-shaped reinforcing bars can be processed with high precision.

[Brief explanation of drawings]

FIG. 1 is a top view of an embodiment of the device of the present invention;
FIGS. 2A to 2D are schematic diagrams showing the situation when lattice-shaped reinforcing bars are actually processed using the same apparatus. p... Reinforcing bar, 1... Work table, 2... Fulcrum pin, 3... First clamp stand, 4... Second clamp stand, 5... Guide groove, 6... Guide groove, 7
...Guide groove, 8...Guide groove.

Claims (1)

[Claims] 1 A table 1 on which reinforcing bars are placed, a fulcrum pin 2 fixed to the center of the upper surface of this table 1, and a table 1 located on both left and right sides of this fulcrum pin 2.
A first reinforcing bar clamping table 3 and a second reinforcing bar clamping table 4 are arranged above the table and are movable along the top surface of the table, and each of these reinforcing bar clamping tables 3 and 4 is placed approximately at the center of the fulcrum pin 2. The first reinforcing bar clamping table 3 holds the V-shaped bent portion of the reinforcing bar in the V-shape. The second reinforcing bar clamping table 4 includes a V-shaped clamping part D that removably clamps the reinforcing bar in a straight shape, and the second reinforcing bar clamping table 4 is a linear clamping part D that removably clamps the reinforcing bar in the straight unprocessed part in a form that maintains the straight shape. Furthermore, the V-shaped clamp part D and the linear clamp part E have a support surface that supports the part of the reinforcing bar to be bent from the inside and gives a bent part to the reinforcing bar during bending of the reinforcing bar. A bending device for lattice-shaped reinforcing bars, characterized in that D1 and E1 are formed respectively.