DE4137122A1 - Continuous prodn. of welded mesh, esp. in reinforcement mats - in which long and cross wires are continuously drawn from reels and wire ends are electromagnetically joined reel=to=reel without stopping mesh welding machine - Google Patents

Abstract

Process comprises automatically weld joining wire ends and providing adequate wire supply without stopping the operation of the mesh welder. Pref. the wire supply required for automatic welding of wire ends is accumulated in two or more controlled loops. Alternativley, the draw-off direction from the reel is reversed and an automatic butt welding unit travels with the wire for the duration of the butt welding operation. USE/ADVANTAGE - Used in the mfr. of welded mesh, esp. reinforcing mats, in which the long and cross wires are continuously drawn from reels. Allows wire ends to be joined reel-to-reel without stopping the mesh welding machine.

Description

Reinforcing steel mats consist of welded at right angles to each other Wire rods. These are u. a. manufactured by the for the longitudinal and Cross wires are continuously withdrawn from coils. This means that at the end of the wire of a coil, the welding machine must be stopped in order to End of the existing wire with the beginning of the wire of the new coils must be welded. Today, welding is still done manually Butt welding process with a special butt welder. To do this the welding machine is stopped, i.e. production is interrupted.

The duration of the machine downtime can be depending on the skill of the Personnel up to 5 minutes and more.

The frequency of welding - and therefore also that of machine downtime - in one shift depends on the bobbin filling capacity and the working speed welding machine. Total downtimes are up to 25% No rarity.

The following invention relates to 2 different ones Procedures which the above Eliminate disadvantages.

Method 1 using a loop

Current procedure: - s. Fig. 1 -
The wire ( 2 ) (line or cross wire) is pulled off the spool ( 1 ) by means of a pair of rollers ( 3 ) and inserted into the ring loop (5-max. Ring loop diameter). As soon as the wire / ring loop touches the electronic monitoring 7 , the roller pair running at a lower wire conveying speed ( 4 ) is switched on or the conveyance is completely interrupted in the absence of the roller pair ( 4 ). The wire mesh welding machine intermittently pulls in the wire at point ( 8 ) during its work process.

The minimum diameter of the ring loop is monitored by the electronic monitoring ( 7 ). As soon as this becomes active, the pair of rollers ( 3 ) resumes and the pair of rollers ( 4 ) opens.

The ring loop has a max. Diameter of approx. 2.5 meters, the min. Diameter is approximately 1-1.25 meters. This results in a supply of wire length from 2.5 -1.25Pi = 3.92 m.

The welding machine processes per minute at a cycle rate of 120 / minute and 150 mm line wire feed thus 18 meters.

The wire feed from the ring loop can therefore be interrupted 3.92 / 18 _* 60 = 13 seconds. This time is sufficient for a butt welding process, the duration of which is approximately 20 seconds.

The method to be protected here provides that instead of one Ring loop / line wire now an additional is installed, whereby the workflow is represented as follows:

A filled wire spool ( 13 ) has been provided on the drain frame ( 15 ). The wire start ( 12 ) is inserted into the welding jaws (positive hooks) of the butt welder ( 14 ).

The line wire ( 2 ) forms an electrical bridge between the coil ( 1 ) and wire guide ( 17 ). When leaving the wire end, this bridge is interrupted and a manipulator detects the wire end of the line wire ( 2 ) and brings it between the negative welding jaws of the butt welder ( 14 ).

The butt welder also has suitable devices for the Ab cutting the wire, cleaning the contact surface and pushing away the Welding forming ridge.

The butt welding process can proceed. The duration of this process is about 20 seconds.

The conveying of the wire is interrupted during this process. The welding machine has now pulled the wire from a double ring loop ( 5 + 6 ). The stock lasts for approx. 26 seconds.

The ring loop was checked in such a way that an additional pair of rollers ( 18 ) kept the second ring loop ( 7 ) and the roller pair (s) ( 3 + 4 ) the first ring loop ( 5 ) at maximum value.

Method 2 using a movable butt welder, see p. Fig. 3-4-5

In Fig. 3, a welding line for the production of reinforcing steel mats is shown with the coils ( 1 ), the coil outlet frame ( 2 ), the longitudinal wire ( 3 ) running in the direction of the welding machine ( 8 ), a guiding and monitoring yoke ( 4 ), one Straightening unit ( 5 ), a line wire take-off ( 6 ) pair with the transport rollers, the ring loop ( 7 ) and the welding machine ( 8 ).

A stationary butt welding device ( 12 ) for welding the wire ends to one another is generally located between the coil outlet ( 2 ) and the straightening unit ( 5 ).

At the wire end of a coil, the beginning of the new coil is already clamped in the welding jaws of the butt welder ( 12 ). As soon as the wire end of the expired coil is in the area of the butt welding machine ( 12 ), the welding machine is switched off, the new wire end is cut off, the surface is removed from the scale for better contact between the welding jaw and the wire and is manually inserted into the second welding jaw. This is followed by the welding process with subsequent cooling time, grinding off the welding burr formed during butt welding and unclamping the now welded wire from the welding jaws and releasing it to the welding machine to restart production. Duration in manual process approx. 5 minutes.

The procedure to be protected provides s. Fig. 4 + 5

1. The line wire ( 3 ) does not leave the coil in the direction of the welding machine ( 8 ), but in the opposite direction, in the direction of the deflecting roller ( 10 ) and is guided through a control yoke ( 9 ) at the end of the coil sequence ( 2 ) and then via deflecting rollers ( 10 ) upwards, then continue after 180 degrees reversal in direction welding machine ( 8 ).

As soon as a coil is empty, the manipulator ( 11 ) is activated via an electrical contact in the control yoke ( 9 ), which detects the wire end and introduces it into the butt welding machine ( 12 ). The butt welding machine ( 12 ) has devices that clean the contact surface of the wire, shear the wire on the end face, and a device for pushing off the welding burr that arises during welding.

As soon as the new wire is clamped between the jaws of the butt welder, the manipulator ( 11 ) releases the wire ( 3 ) and the butt welder can move during the work process on a track controlled by a suitable drive in the direction of the welding machine to the end position and meanwhile the required Do work / butt welding.

The new line wire is driven by the movable and driven die welding machine with drawn.

Because the length of a spool outlet up to 25 meters, the working speed the welding machine is approx. 18 meters / minute, the butt welding duration can up to 40 seconds or this procedure is used in welding machines be set, whose cycle numbers go up to 200 / minute and beyond.

Claims (3)

1. A method for the continuous production of reinforcing steel mesh, characterized in that during the working process of the welding machine the welding of wire ends is carried out automatically, by means of a suitable method and provision of sufficient wire stocks, without requiring a welding machine to be shut down. 2. The method according to claim 1, characterized in that for the automati welding the wires together the required wire supply in 2 or more controlled loop loops can be accumulated. 3. The method according to claim 1, characterized in that the direction of flow the wire from the coil is reversed and an automatic one Butt welder with the running wire controls for the Duration of welding the wire ends together.