RU2251475C1 - Apparatus for continuous manufacture of flat nets - Google Patents

Abstract

FIELD: contact welding, namely equipment for continuously making flat nets, mainly wire nets.

SUBSTANCE: apparatus for making nets of wire with diameter 2 - 4 mm includes upper and lower electrode units with electrodes arranged on foundation of welding machine; mechanism for step feed of lengthwise wire; mechanism for piecewise feed of cross wire, control system. Mechanism for piecewise feeding cross wire includes units of feeder and magnetic catcher, both rigidly mounted in foundation at different sides of lower electrodes. Feeder includes hopper for cross wires; said hopper is communicated with inlet of slit-like guiding duct. Splitter of wires in the form of gate connected to pneumatic cylinder is arranged at outlet of said duct. Magnetic catcher includes magnetic blocks arranged in grooves on common bracket. Each magnetic block includes permanent magnet whose mutually opposite faces are embraced by means of magnetic circuit; poles of magnetic circuit are in the form of plates. Vertical end surfaces of said plates are placed along single row in welding line between lower electrodes.

EFFECT: simplified design, improved quality of flat net.

2 cl, 5 dwg

Description

The invention relates to resistance welding, in particular the production of flat wire mesh of ⌀ 2-4 mm on multi-electrode welding machines.

A device (1) for the resistance spot welding of gratings from rods of a smooth profile of measured length, comprising loading devices for feeding longitudinal and transverse wires, welding electrodes. The feed of the transverse rods is carried out from the hopper into the lodgements of the endless chain conveyor. Piece cutting off the rods is carried out by the protruding plates of the chain conveyor.

The disadvantage of this device is that a thin wire, resting at its ends on the lodgements of the chain, sags due to its flexibility, which does not provide high-quality products.

A known machine for the manufacture of gratings (2), comprising a longitudinal wire feed mechanism, a cross wire feed mechanism, upper and lower electrode blocks, a control system.

The transverse wire is fed from the bays and positioned in two clamping devices located at the edges of the mesh web. Both clamping devices or one of them can be moved if it is necessary to reconfigure the width of the welded mesh. To prevent sagging of the wire between the clamping devices, several identical blocks are installed in a row, each of which has a fixed base and a reclining spring-loaded plate, and a transverse wire passes between them in the lodgements. After the wire is threaded, it is cut with knives from the bay and transferred by mechanisms to the welding position. Moreover, to prevent sagging of the wire during transportation, mechanical clamps are provided.

Thus, the accuracy of orientation and laying of the transverse wire relative to the longitudinal one is determined by the operation of the entire kinematic chain. The welding machine of the well-known Austrian company EVG certainly produces high-quality mesh, but in the technical sense the machine is very complex, and this machine has its drawbacks in that, due to the rigidity of its design, a number of sizes of transverse steps are limited and therefore their regulation in a wide range is impossible.

A known line for the manufacture of reinforcing meshes (3), on which it is possible to cook automatically both the reinforcing mesh and the masonry mesh with two channels. The line includes step-by-step feeding mechanisms for longitudinal wire, welding electrodes, transverse wire feeding mechanisms from bays. The transverse wire is held by grippers mounted on a trolley reciprocating. Orientation of the transverse wire is as follows. The wire is passed through the matrix and at high speed passes a series of guides made in the form of a “bulb”, one of the holding sides being spring-loaded.

As you can see, the orientation base of the thin wire is any of the sides of the "antennae" fixed in the latch, and one of the sides is spring-loaded in the direction of travel of the longitudinal wire. When lowering the rocker arm carrying the upper electrodes, the rocker swings in the hinge joint, while the upper electrodes do not simultaneously touch the welding wire due to misalignment of the shoulders, this leads to the squeezing of the transverse wire to one side, and not always to one side of the "antennae" which can cause a wavy position of the transverse wire relative to the welding line. In addition, the “antennae” of the retainer in high-performance machines wear out quite quickly in the presence of dry friction of metal surfaces. Thus, this device is quite complex, but it is impossible to obtain a grid with the exact geometric dimensions of the cell, and therefore it is impossible to obtain high-quality products.

The closest analogue selected as a prototype is (4) a device for the continuous manufacture of flat reinforcing meshes. The device contains upper and lower roller electrodes. The lower roller electrode is equipped with an electromagnet. The device comprises a stepwise feed mechanism for the longitudinal wire, a piecewise feed mechanism for the transverse wire and a control system. The transverse reinforcement is fed through the guide die and abuts against the stop-clamps. The gripping, fixing, and cutting mechanisms sequentially process the reinforcement and, then, the rod is dumped onto an inclined tray, through which it rolls onto the lower roller electrode equipped with an electric magnet. The rod adheres to the cylindrical surface of the lower roller electrode and, under the action of magnetic forces, is transferred to the welding zone under the longitudinal rods. The transverse step of the mesh can be adjusted by changing the speed of rotation of the lower welding roller. The above device contains a magnetic device and is intended for welding fittings. However, it is impossible to use it for welding a mesh of thin wire, because when rolling it along an inclined tray due to the light weight of the wire and its flexibility, it will stick and randomly orient itself on the cylindrical surface of the lower roller, therefore it is impossible to make a good quality mesh.

Thanks to the proposed device, the authors obtained a new technical result, which consists in simplifying the design and improving the quality of the wire mesh ⌀2-4 mm.

These tasks are interrelated, they were solved due to the fact that the known device for the continuous production of flat grids, mainly of small wire diameter, containing lower and upper electrode blocks mounted on the base of the welding machine, a mechanism for incrementally feeding longitudinal wire, a mechanism for supplying cross wire equipped with a magnet, and a control system in which the mechanism for the piece feed of the transverse wire is made in the form of newly introduced feeder nodes for the piece department wire and magnetic catcher for holding and orienting the transverse wire, which are rigidly mounted on the base on opposite sides of the lower welding electrodes, the feeder includes a wire hopper that is connected to the entrance of the slit-like guide channel, a wire cutter in the form of a gate is installed at the outlet of the latter which is connected to the pneumatic cylinder, and the magnetic catcher is made in the form of magnetic blocks, which are fixed in grooves on a common bracket, with each block includes a constant m rot, opposite faces of which are covered by the yoke and the magnetic poles are in the form of plates, wherein the vertical end surfaces of the poles are installed in a row at the welding line and arranged between lower electrodes.

In addition, plates made of carbide material are rigidly fixed at the ends of the poles in the device to increase the strength of the magnetic circuit.

Unlike the prototype, the authors introduce:

firstly, new structural units, such as a feeder and a magnetic catcher, which are closely interconnected with each other;

secondly, a new mutual arrangement of the introduced nodes relative to the lower welding electrodes is proposed;

thirdly, a new arrangement of magnetic poles relative to the welding line was introduced.

The feeder allows you to select a thin flexible wire individually from the beam, and a magnetic catcher installed opposite the output channel bases and orientates the transverse wire along the welding line above the lower welding electrodes.

Compared with analogues, the authors obtained a higher technical effect, which consists in the precise orientation of the transverse wires relative to the longitudinal ones when welding a mesh of ⌀2-4 mm wire on multi-electrode welding machines.

Moreover, the set of essential features is in a causal relationship with the technical result, which consists in simplifying the design and improving the quality of the welded mesh.

According to the authors, the proposed device may be of particular interest to manufacturers of high-quality mesh of thin wire ⌀2-4 mm, designed for the production of elite products, which require accurate cell geometry that determines the high quality of the product. Such a grid is suitable for commercial equipment, wire fittings in the furniture industry, in particular all kinds of racks for wardrobes.

List of figures:

figure 1 shows a General view of a device for the continuous manufacture of flat grids;

figure 2 shows the feeder;

figure 3 shows a magnetic catcher, view I in figure 1, enlarged;

figure 4 is a view of figure 3 on a magnetic catcher;

figure 5 is a view II, the magnetic block in figure 4, is enlarged.

The device comprises lower 2 and upper 3 electrode blocks mounted on the basis of 1 (Fig. 1) of a multi-electrode welding machine. The mechanism of stepwise feeding of the longitudinal wire 4. The mechanism of the single-piece issuance of the transverse wire includes a feeder 5 and a magnetic catcher 6, which are rigidly fixed to the base 1 on opposite sides of the lower welding electrodes 2. The feeder (figure 2) includes a hopper 7 for the transverse wire 8 connected with a slit-like guide channel 9, at the end of which a cutter 10 fixed on the base is mounted, which makes a reciprocating movement under the influence of the pneumatic cylinder 11. The magnetic catcher (Fig. 3) includes a bracket 12, which are fixed magnetic blocks 13 (Figure 4). Each magnetic unit includes a permanent magnet 14 (figure 5), the opposite edges of which are covered by a magnetic core 15 of a magnetic material. The poles 16 of the magnetic circuit are made in the form of plates, and reinforcing plates of hard alloy material are rigidly fixed at their ends. The vertical end surfaces of the 18 magnetic poles are installed in one row “a” (figure 4) along the welding line. Magnetic blocks have the ability to move in the grooves 19 of the bracket 12.

The device operates as follows. In the hopper 7 there are straightened wires 8, which under the influence of the vibration of the welding machine move from the inlet to the outlet of the slit-like guide channel 9. The lower wire is knocked out by a cutter 10, which makes a reciprocating movement under the influence of the pneumatic cylinder 11, the course of which is coordinated with the working welding cycle. Further, the wire “flies out” from the outlet of the slit-like channel and, under the action of magnetic forces, is fixed on line “a” formed by the vertically spaced ends 18 of the magnetic poles 16. This design of the magnetic catcher excludes all wire movements except for the vertical one. In this case, it is not necessary, but a slight inclination of the transverse wire relative to the horizontal axis is possible. Magnetic blocks 13 are mounted in the grooves 19 of the bracket 12, their poles can be installed both between pairs of lower electrodes 2, and to cover them.

Thus, the thin transverse wire is held and oriented along the welding line “a”. Next, the transverse wire moves the electrodes down onto the longitudinal wire in accordance with the welding cycle.

As you can see, the introduced new nodes and their relationship, as well as the relative position relative to the lower welding electrodes, allowed the authors to create a simple in the technical sense, a very reliable, high-performance device for the production of high-quality mesh.

In addition to elite products, it is possible to use the proposed device for the production of masonry mesh widely used in construction, which is made of ⌀2-4 mm wire.

In this case, the high quality of the cell geometry is not so important, but mass production requires high reliability and productivity of the device, which is ensured by the proposed solution.

The device was tested on multielectrode machines manufactured by the Scientific-Production Center “IMEP” CJSC and delivered to customers in Russia and the CIS countries. The device showed reliable operation and productivity in the production of high-quality mesh for high-end products, as well as masonry mesh. Productivity in the production of masonry mesh with a cell of 50 × 50 mm reaches up to 180 m / h with a canvas width of up to 1000 mm.

An additional technical effect is the following:

firstly, the proposed device is easily integrated into an automatic line and provides 1.5 times greater productivity than in known welding lines, with high quality mesh;

secondly, the use of a magnetic field in the catcher replaces the complex kinematic chains existing in known devices, and makes it easy to reconfigure the transverse grid pitch in a wide range of sizes;

thirdly, the proposed device allows you to produce a grid in 2 streams, for which purpose on the bed of the welding machine 2 parallel piece wire feed mechanisms are installed in parallel.

Bibliography

1. A.S. No. 1743763, B 23 K 11/10 // B 23 K 101: 22, claimed 06.10.89, published 30.06.92. Device for resistance spot welding of gratings.

2. RF patent No. 2008155, 23 K 11/00, pending 01/23/91, published 02/28/94. Machine for the manufacture of gratings.

3. RF patent No. 2051774, 23 K 11/10 // B 23 K 101: 22, filed 02.07.90, published 01.10.96. Line for the manufacture of reinforcing mesh.

4. A.S. No. 1622100, 23 K 11/10, stated 09.02.89, publ. 01/23/91. Device for the continuous manufacture of flat reinforcing mesh.

Claims (2)

1. A device for the continuous manufacture of flat grids mainly of small wire diameter, comprising lower and upper electrode blocks with electrodes mounted on the base of the welding machine, a stepwise feed mechanism for the longitudinal wire, a piecewise feed mechanism for the transverse wire, a control system characterized in that the piecewise feed mechanism the transverse wire contains the nodes of the feeder for piece separation of the wire and a magnetic catcher for holding and orienting the transverse wire, rigidly Mounted on the base on opposite sides of the lower electrodes, the feeder contains a hopper for the transverse wires, which is connected to the input of the slit-like guide channel, at the output of the latter there is a wire cutter in the form of a gate connected to the pneumatic cylinder, and the magnetic catcher is made in the form of magnetic blocks, fixed in slots on a common bracket, each magnetic block containing a permanent magnet, the opposite edges of which are covered by a magnetic circuit, and the poles of the magnetic circuit are made in the form of a stins, the vertical end surfaces of which are installed in one row on the welding line and are placed between the lower electrodes. 2. The device according to claim 1, characterized in that to increase the strength of the poles of the magnetic circuit at their ends are rigidly fixed plates of carbide material.

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