Wire netting, a process and a device for manufacturing the wire netting

Abstract

A hexagonal wire netting ( 7 ), a process for manufacturing such a wire netting and a device for manufacturing a hexagonal wire netting ( 7 ), the device comprising an assembly of tubes ( 5 ) for leading the wires ( 1 ) of which every other is twisted into a spiral shape, a spindle ( 6 ) assembly and a drum ( 8 ) receiving the wire netting ( 7 ), the drum ( 8 ) being provided with &tent elements ( 21 ). Between each tube ( 5 ) leading the spirally twisted wire (I) and the cooperating spindle ( 6 ) a straightening guide (IO, IO′) is located having an inlet opening ( 13, 15 ) cooperating with the tube ( 5 ) and an outlet opening ( 12, 20 ) cooperating with the spindle ( 6 ). The detent elements ( 21 ) are arranged on the drum ( 8 ) in such a way that the produced wire netting ( 7 ) has meshes in which the proportion of the width (A) to the length (B) is less than 0.75.

1 . A hexagonal wire netting, for use in particular in protecting soil embankments, the wire netting being made of steel wires and wherein the wires are braided in at least 1.5 fold braids so as to form meshes in which the proportion of the width to the length is less than 0.75, the wires being made of high carbon steel having tensile strength in the range of 1500-1900 MPa. 
     
     
         2 . The wire netting according to  claim 1 , wherein the wires are made of steel having carbon content from 0.71% to 1%. 
     
     
         3 . The wire netting according to  claim 1 , wherein the wires are provided with an anti-corrosion coating, preferably a zinc-aluminum coating in the amount of min. 150 g/m 2 . 
     
     
         4 . The wire netting according to  claim 1 , wherein the wires are made of stainless steel. 
     
     
         5 . A device for manufacturing a hexagonal wire netting, the device comprising an assembly of tubes for leading wires of which every other wire is twisted into a spiral shape, a spindle assembly and a drum receiving the wire netting, the drum being provided with detent elements, each spindle being adapted to lead one wire passing therethrough and fed by a cooperating tube and to being translated back and forth as well as rotated by 540 degrees alternately with the translations, so that the wires leaving the spindles are braided in at least 1.5 fold braids forming the wire netting to be subsequently received by the drum, wherein a straightening guide is disposed between each tube leading the spirally twisted wire and the cooperating spindle, the straightening guide having an inlet opening cooperating with the tube and an outlet opening cooperating with the spindle, and wherein said detent elements are arranged on the drum in such a way that the produced wire netting has meshes in which the proportion of the width (A) to the length (B) is less than 0.75. 
     
     
         6 . The device according to  claim 5 , wherein the straightening guide comprises a wall in a shape of a truncated cone, a smaller edge of which constitutes a central outlet opening cooperating with the spindle, and a larger edge of which constitutes a central inlet opening cooperating with the outlet of the tube. 
     
     
         7 . The device according to  claim 6 , wherein the inner side of the wall in a shape of a truncated cone is provided with a guiding groove for assisting in the straightening of the wire. 
     
     
         8 . The device according to  claim 5 , wherein the straightening guide comprises a hollow cylinder having an inlet edge and an outlet edge, and being provided with an inlet wall in a shape of a truncated cone, a larger edge of which is aligned with the inlet edge of the hollow cylinder and constitutes the inlet opening cooperating with the outlet of the tube, while a smaller edge of which constitutes the inlet opening leading to the hollow cylinder, which is further provided with an outlet wall in a shape of a truncated cone, a larger edge of which constitutes the outlet edge of the hollow cylinder, while smaller edge of which constitutes the central outlet opening cooperating with the spindle. 
     
     
         9 . The device according to  claim 8 , wherein, the inner side of said inlet wall in a shape of a truncated cone is provided with a guiding groove for assisting in the straightening of the wire. 
     
     
         10 . The device according to  claim 5 , wherein the straightening guide comprises a plastic material. 
     
     
         11 . A process for manufacturing a hexagonal wire netting in a device comprising an assembly of tubes for leading wires of which every other wire is twisted into a spiral shape, a spindle assembly and a drum receiving the wire netting, the drum being provided with detent elements, and each spindle being adapted to lead one wire passing therethrough, the wire being fed by a cooperating tube and the spindle being translated back and forth as well as rotated by 540 degrees alternately with the translations, so that neighboring wires leaving the spindles are braided in at least 1.5 fold braids so as to form the wire netting to be subsequently received by the drum, wherein the wires comprise high carbon steel having tensile strength in the range of 1500-1900 MPa, and the wires that are spirally twisted in the tubes are being straightened before being fed into the spindles, the produced wire netting having meshes in which the proportion of the width to the length is less than 0.75. 
     
     
         12 . The process according to  claim 11 , wherein the wires made of steel having carbon content from 0.71% to 1% are used. 
     
     
         13 . The process according to  claim 11 , wherein the wires are provided with an anti-corrosion coating, preferably a zinc-aluminum coating in the amount of min. 150 g/m 2 . 
     
     
         14 . The process according to  claim 11 , wherein characterized in that the wires comprise stainless steel.