JPH06234032A - Manufacture and manufacturing device for box-shaped welded wire nets - Google Patents

Abstract

PURPOSE:To attain automation, simplification and high efficiency of welding of box- shaped welded wire net binding materials by holding wire nets in parallel at a necessary interval, passing a long-sized steel bar for binding materials to the binding material fitting position at the vertical position for both wire nets and welding the steel bar tip by resistance welding guns along vertical or horizontal reinforcement of the rear side wire net. CONSTITUTION:When the tips upper and lower step wire nets M hit on a checking plate 2a by starting of upper step and lower step conveyors 1 and 1a, the binding material fitting position stops just under a lower side gun G. When a feed clamp 7 holding the steel bar W inserted in advance is pushed down by a fluid pressure cylinder in a supply head 5 by the thickness of the box-shaped welded wire nets, the lower end of the steel bar W stops along the vertical reinforcement M1 of the rear side wire net M. The lower side G then rises to the welding position from the standby position by the fluid cylinder 11 and the tip of the steel bar W is welded to the vertical reinforcement M1. After welding, the steel bar W is cut to the length of the binding materials and the stage to weld the steel bar W to the vertical or horizontal reinforcement of the surface side wire net is carried out almost simultaneously.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a method and an apparatus for manufacturing a box-shaped welded wire net built in a concrete slab.

[0002]

2. Description of the Related Art A box-shaped welded wire net for a concrete slab is made by integrally joining two welded wire nets with a connecting material. The applicant of the present invention is a specialized manufacturer of welded wire mesh, and in recent years, the welding of tie material has also been automated, and a patent is being applied as Japanese Patent Application No. 3-358289. As shown in Fig. 7, a large number of ladder-shaped joints S'are prepared, welded to both side edges of the upper and lower elongate wire nets one after another, and then the cutting width C is cut off to divide into products of length a. Is.

[0003]

The box-shaped welded wire mesh produced by the method shown in FIG. 7 is unsuitable for large-scale concrete slabs because the connecting material is welded only to both side edges of the upper and lower wire meshes and not in the central portion. . In addition, a large number of connecting materials are prepared and placed in advance, and a mechanism that feeds and supports the welding position at appropriate times is required.
It wasn't easy. The present invention is mainly intended for a box-shaped welded wire mesh for a large-sized concrete slab having a length and width of several meters, and not only connects both side edges of the upper and lower wire meshes with a connecting material, but also connects an intermediate position of the horizontal width at some place. In the case of concrete slabs with openings and cutouts, the problem was the development of a manufacturing method and device in which a connecting material could be inserted and connected at various places such as the openings of the box-shaped wire mesh and the edges of the cutouts.

[0004]

A method for manufacturing a box-shaped welded wire mesh according to the present invention is a method for manufacturing a box-shaped welded wire mesh in which two flat welded wire meshes are welded and assembled through a connecting material. Hold the long connecting steel rods parallel to each other with a vertical posture on both wire nets, pass through the connecting material mounting position, and weld the tip of the steel rod along the vertical or horizontal line of the back wire net with a resistance welding gun. Then, the step of cutting the steel rod to the length of the connecting material and the step of welding the steel rod to the longitudinal or transverse streaks of the front side wire mesh are performed successively.

In the box-shaped welded wire mesh manufacturing apparatus of the present invention, the upper and lower conveyors for maintaining the vertical interval for welding two welded wire meshes in a box shape and synchronously conveying in the vertical direction in the horizontal posture, A stop mechanism that stops both wire meshes every time the planned joining material attachment position comes to the welding position, a frame with a beam that can stand up and down over the conveyor, and a beam that can be moved laterally along the beam. Individual upper trolley, steel rod supply head hanging from each of the above upper trolleys, rod straightening machine, rod feed clamp, rod fixing clamp, rod cutting head, which were attached in this order from the top,
And a plurality of lower carts with an upward resistance welding gun lifting mechanism that can be laterally moved corresponding to each of the upper carts, the rails traversing under the conveyor.

[0006]

[Function] Conventionally, the production of a flat welded wire mesh has been rationalized sufficiently by a relatively long experience, but the shape of the connecting material for stacking two wire meshes into a box shape and its automatic welding are still in the beginning. I just started. In particular, the joint welding is troublesome, so in order to reduce the number of welding of the joint material as much as possible, the shape is devised like the ladder-shaped joint material 3 in Fig. 7, and the welding position should be four in one box-shaped wire mesh. I was doing. This invention abandons such conventional thinking,
I decided to put the connecting material on the whole surface of the box-shaped wire mesh. As a result, unlike the conventional case, it is not necessary to impose the action of preventing the upper and lower wire nets from being twisted on the tie member itself, and it has become possible to use a mere steel rod as the tie member. Then, by simply using a steel rod, a simple construction method peculiar to the present invention is possible, in which the connecting material is extended everywhere as a long steel rod, and is cut after welding. If there are a plurality of resistance welded portions between the steel rod tie material and the wire netting, the twisting resistance of the upper and lower wire netting in that direction is practically sufficient.

In the box-type welded wire mesh manufacturing apparatus of the present invention, the two wire meshes are advanced by the upper and lower conveyors, the connecting mechanism is stopped at the welding position by the stop mechanism, and the bar of the steel bar supply head of each upper truck is moved. Lower the feed clamps all at once and align the steel rod tips with the back side wire mesh. Then, the upward resistance welding guns of the lower carts ascend to weld the tip of the steel rod to the muscle. Then the steel bar is cut with a bar cutting head attached to the lower end of the steel bar feeding head. Before and after this, the steel rod is also welded to the front side wire netting. With this, as many connecting materials as the number of upper carts are welded together. Subsequently, by the stop mechanism, the next connecting material mounting position of the upper and lower wire nets is stopped at the welding position, the steel rod is lowered as described above, welded to both wire net bars, and cut,
This process is repeated.

[0008]

1 and 2 show an embodiment of an apparatus for manufacturing a box-shaped welded wire mesh according to the present invention. In the figure, 1 and 1a are upper and lower conveyors, 2 is a carriage of a stop mechanism, 2a is a stop plate thereof, 3 is a frame, 3a is a beam capable of moving up and down, 4 is an upper carriage, 5 is a steel rod supply head, 6 is a bar straightening machine, 7 is a bar feed clamp, 8 is a bar fixing clamp, 9 is a bar cutting head, 10 is a lower trolley, G is a resistance welding gun (X type), W is a steel bar to be a connecting material S, W
Reference numeral ₀ is a steel rod feeding device, and in this embodiment, the gun G was provided above and below. FIG. 6 is an example of a box-shaped welded wire mesh made according to the present invention. Since it is for a large concrete slab of several meters in length and width and has an opening A in the center, the conventional method of welding the connecting material only to both edges cannot be used. According to the present invention, the connecting material (commonly called spacer) S can be arranged on the entire surface as shown in the drawing.

The upper and lower conveyors 1 and 1a are roller conveyors, which are positively driven, but when the wire mesh M just placed on it is stopped by the stop plate 2a, it continues to slip. In the meantime, in this example, the five connecting materials S arranged side by side are welded all at once. As for the work procedure, the steel rod W is preliminarily inserted from the five steel rod delivering devices W ₀ into the respective upper carriages 4 as shown in FIG. 2, and is added to the rod straightener 6 at the upper end of each steel rod supply head 5. Let The tip of the steel rod W, which has not been bent by the straightener 6, is stopped at a position slightly out of the cutting head 9 at the lower end of the head 5. On the other hand, the wire mesh M is placed on the upper and lower conveyors 1 and 1a, and the stop plate 2a of the stop mechanism 2 that stops the wire mesh M is placed so that the first planned joining material welding position is directly above the lower welding gun G (Fig. 1 finished welding of the first tie material S, 2
The second joining material welding position is shown just above the lower gun G).

When the tips of the upper and lower metal nets M, M hit the stop plate 2a by the start of the conveyors 1, 1a, the connecting member mounting position stops right above the lower gun G. When the feed clamp 7 holding the pre-inserted steel rod W is pushed down by a fluid pressure cylinder (not shown) in the supply head 5 by a constant stroke, that is, by the thickness of the box-shaped welded wire mesh, the steel rod as shown in FIG. The lower end of W stops along the longitudinal line M ₁ of the back side wire mesh M. Therefore, the lower gun G is moved from the standby position by the fluid pressure cylinder 11 to the positions shown in FIGS.
To the welding position, and the tip of the steel rod W is welded to the vertical bar M ₁ . After welding, the gun G is slightly lowered by the cylinder 11 so that the wire mesh M does not hit the transverse line M ₂ when advancing. At the same time, in this embodiment, the blade 9a of the rod cutting head 9 of FIG.
To cut the steel rod W to the size of the connecting material, immediately withdraw the steel rod supply head 5 of FIG. 1 to the right side standby position, and instead advance the upper gun G to the welding position. Then, the gun G is lowered, the cut end of the steel rod W is welded to the vertical line M ₁ of the front side wire mesh, and is returned to the standby position in FIG. The lifting and lowering of the upper gun G is performed by the fluid pressure cylinder 11 suspended from the upper carriage 4, but the lateral movement is depicted by an arrow, and the cylinder is omitted. The elevating beam 3a on the gantry 3 and the upper carriage 4 are moved up and down only when the thickness of the box-shaped wire mesh changes.

Since the apparatus of the embodiment shown in FIG. 1 mainly targets a relatively thick box-shaped wire net, the welding guns G are arranged above and below. When targeting a relatively thin box-shaped wire mesh, the steel bar W can be welded to the wire mesh vertical bars M ₁ and M ₁ on both the front and back sides by using a lower gun G having a slightly deeper bottom as shown in FIG. . At that time, the steel rod W may be cut after the front and back welding is completed. After the joining material welding and cutting are completed, the fixed clamp 8 is closed, the feed clamp 7 is opened, and the steel rod W is gripped again after returning upward. The fixed clamp 8 is opened. Figure 4 shows the feed clamp 7
In the plan view, the steel rod W coming from above is passed through the rod receiving hole 7b, and this is pressed against the angular inner wall surface by the pressure head 7a and the cylinder 11 and held. The fixed clamp 8 has the same shape. FIG. 5 is a cross-sectional view showing the internal structure of the rod cutting head 9. When the cam 9b is rotated by the cylinder 11, the link 9c pushes out the blade 9a and pushes off the steel rod W passing through the through hole 9d. ing.

In each upper carriage 4 shown in FIG. 2, the relative positions of the carriages 4 can be freely changed by the respective servomotors 4a, so that it is easy to change the connecting member mounting position for feeding each steel rod W. Can handle. In response to this, the lower trolleys 10 are also related to each other by driving them individually by the chain 10a. Although one embodiment has been described above, the present invention is not limited to this embodiment,
Various changes according to known techniques of those skilled in the art depending on the implementation conditions,
It goes without saying that it can be applied. The expressions "upper and lower" in the description indicate relative positions.

[0013]

According to the present invention, the automation of the box-type welded wire mesh tie welding which was first developed by the applicant of the present invention is further increased in scale, and at the same time, simplification and efficiency are achieved. That is, the connecting material itself is changed from the conventional ladder shape to one bar, and it is not necessary to manufacture and store a large number of the connecting materials in advance as in the conventional case and supply them to the welding portion one by one. We have developed the simplest construction method in which a long steel rod is sent to the weld and welding and cutting are repeated. A steel rod, which has no bending tendency with a rod straightening machine, is held by the straightening machine of the steel rod feeding head and the moving clamp so as to be surely along the wire netting, so that resistance welding can always be performed without deviation. Since the tip of the steel rod is first welded and then cut to the size of the connecting material, both sides of the cutting position will be held by the tip welded part and the feed clamp in front, and the cut end will be cut off. There is no risk of moving or the steel rod side cut end coming off.

In the apparatus of the present invention, a plurality of upper carriages are arranged on a beam that can be raised and lowered and can be simultaneously raised and lowered. Therefore, the steel rod supply heads attached to the respective upper carriages can be adapted to the thickness of the box-shaped welded wire net as a product at any time. To be made. Each upper trolley and lower trolley can be relocated by computer control according to the connecting position of the connecting material in the product width direction, so not only the setup change when changing the product is easy, but also the connecting material of one box-shaped wire mesh is attached. It is even possible to change the lateral arrangement of parts on the way to perform continuous work.

[Brief description of drawings]

FIG. 1 is an elevation view of an embodiment of the device of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is an explanatory view of a main part of FIG.

FIG. 4 is a plan view of a feed clamp.

FIG. 5 is an elevational view of a rod cutting head.

FIG. 6 is a perspective view of an example of a box-shaped welded wire mesh.

FIG. 7 is an explanatory view of a conventional technique.

[Explanation of symbols]

 1 Upper Conveyor 1a Lower Conveyor 3 Frame 4 Upper Cart 5 Steel Bar Supply Head 10 Lower Cart

Claims (2)

[Claims] 1. A method for producing a box-type welded wire net, in which two flat welded wire nets are welded and assembled via a tie material, wherein a long steel bar for tie material is held by holding the two wire meshes in parallel at a required interval. Through the wire mesh in a vertical position to the connecting material mounting position, weld the steel rod tip along the longitudinal or transverse line of the back wire mesh with a resistance welding gun, and then cut the steel rod to the length of the connecting material. A method for manufacturing a box-shaped welded wire mesh, which comprises performing the step and the step of welding the steel rod to the longitudinal or horizontal bars of the front side wire mesh in succession. 2. An upper-lower conveyor for vertically welding two welded wire meshes in a box-like shape while maintaining a vertical interval, and horizontally conveying the wire meshes in the vertical streak direction. Each time, a stop mechanism that stops both wire nets, a frame with a beam that can stand up and down over the conveyor, and that can move up and down, a plurality of upper carriages that can be laterally moved along the beams, Mounted on the hanging steel rod supply head in order from the top, a rod straightening machine, a rod feed clamp, a rod fixing clamp, a rod cutting head, and a rail traversing below the conveyor, and corresponding to each of the above upper carts. An apparatus for manufacturing box-shaped welded wire mesh, comprising: a plurality of movable upper and lower resistance welding guns and a lower carriage with a lifting mechanism.