SU144926A1 - Resistance Wire Welding Machine - Google Patents

Description

Machines for resistance welding of rebar grids are known, which include a welding device with movable electrodes, a feed mechanism for hydrodynamic and transverse rods, a device for cutting them, a receiving chamber for ready-made nets, and a time relay system and electro-pneumatic valves for controlling the sequence of operation of individual mechanisms. However, such machines are not reliable in operation.

A distinctive feature of the described machine is that the rod feed mechanism contains a pneumatic actuator and ball grippers for intermittent stirring, the rod.

The drawing shows a diagram of the machine.

The machine for resistance welding of rebar grids consists of a frame, a welding device / with movable electrodes 2 and a welding transformer m 3, a feed supply mechanism 5 and a transverse 6 rods, a device 7 for trimming these sterols: it, a receiving chamber 8 for ready grids 9, control panel 10 and pneumatic drive //.

When the button 12 is pressed, the starting relay 13 is triggered and a command is given to the electronic time relay 14. The machine performs a full cycle of operation and stops at the starting position. After working on the machine, the universal switch 15 is installed for continuous operation, the relay 13 is triggered, the command is again given to the relay M, turning on the welding transformer 3 and the electric pneumatic valve 16. The latter turns on the pneumatic cylinder 17, which moves the electrodes 2 to the welding position. When the pneumatic cylinder 17 is activated, the mechanical pneumatic valve turns off 18. The pneumatic cylinder 19 associated with it retracts the carriage 20 of the mechanism 4 to the rear position. Backing away, the carriage is turned off mechanically by the non-damper valve 21 controlling the pneumocycle 22 ndrami transverse feed it stubble 6. Left tsi.lkndr 22 opens the relay 14. The power supply circuit 20 in the carriage stop position deactivates the mechanical pneumatic valve 23, the air cylinder 24 is governed 1st device 7, the drive blades 25 present cutting transverse rods 6. Kon№ 144926- 2 -

Duktor 26 takes the rods 6, cut off from the wires 27, coming from the bays 28.

As a result of the opening of the power circuit of the time relay M, the electro-pneumatic valve 6 is turned off, the cylinder 17 lifts the electrodes 2, including the valve 18, which causes the carriage 20 to move forward together with the wires 29 unrolled from the coils 30 and clamped in the ball clamps 31. When moving forward, the carriage 20 turns on the valve 21 and feeds the welding device Y along with the wires 29 of the conductor 26 carrying the rods 6. Turning on the valve 21 causes the movement of the cylinders 22, the left of which, acting on the switch 32, closes the supply circuit 14. The relay valve 16 is turned on again, the cylinder 17 lowers the two electrodes, and welding the rods 6 occurs with the wires 29, whereupon the cycle is repeated.

The advancing welded wire 9 acts on the limit switch 33, which through the electric pneumatic valve 34 turns on pneumatic cylinders 35 driving the blades 36 of the trimming device 7 | the longitudinal rods 5 of the wire 29. The right knife 36 acts on the switch 37, which turns off the valve 34. Simultaneously with the cylinders 35, the pneumatic cylinder 38 operates, which opens the door 39, and the grid 9 is ready to fall from the receiving chamber 8 into the bunker.

The described machine allows to automate the production of reinforcing meshes, to get rid of the use of heavy physical labor, to increase productivity and improve product quality.

The research institute of reinforced concrete in its law noted that this maschina is simple and original in design and possesses a novelty in the part of the supply of transverse rods from the bays with the help of collet ball grips. In addition to the OGG1, it automatically performs all operations, including the packaging of finished grids, while the waste of reinforcing steel is minimal.

Subject matter

A contact welding machine for rebar grids containing a welding device with movable electrodes, a feed mechanism for longitudinal and transverse rods, a trimming device, a receiving chamber for finished grids and a time relay system and ltropropneumatic valves for controlling the sequence of operation of individual mechanisms, that, in order to increase operational reliability, the rod feed mechanism includes pneumatic actuator and ball clamps for intermittent movement of the rods.