SU764893A1 - Resistance welding unit - Google Patents

Description

one

The invention relates to devices for welding uniform panels of curvilinear configuration along a contour and can be used in mechanical engineering .5

A known resistance welding machine is equipped with a drive carriage that is movable relative to the frame, carrying a rotary spring-loaded table with a shaft tO and a stepping mechanism with a drive made in the form of a rail that engages with a gear mounted on the shaft, and an adjustable stop, 15 interacting with the rail l.

In the case of welding on this installation of panels of a curvilinear closed configuration with a stepped bend 20 welded on planes, it is necessary to use collectors: pneumatic to supply compressed air to the clamping, fixing and turning-off actuators, ensuring such an orientation of the curved planes of the product at which the optimum the welding process, and electrical to ensure the communication of signals from position sensors 30

nor (limit switches) and automatic control systems.

It is also known a device for step-by-step feeding of products equipped with a carriage on which a pin is fixed and mounted on the base with a possibility of movement in a direction parallel to the direction of movement of the carriage, while the movement drive of the pin is made in the form of a movable rod with a profile cam acting through it attached to the carriage two shoulders lever on pin 2.

However, this device does not provide a reversal for the use of a reverse stroke in order to carry out a subsequent welding cycle.

When using such a device, at the end of the welding process of all points, a clutch controlled from the end switch is required, which activates a chain drive to move the cart to the next cycle.

The closest in technical essence to the invention is an installation for resistance welding, containing, installed on the base, welding tongs, a rotary table with a bed, a copier and a bit, kinematically associated with it a pitch movement mechanism with a copy roller and a leading sprocket H

This device also does not provide a reversal of the table — for welding during a return stroke, which reduces the productivity of the installation.

To ensure the reversal of the door table and to perform welding during the return stroke, the mechanism for the step movement of the table is equipped with a two-cavity cylinder, on the sleeve of which a longitudinal hole is made and two gears with grooves on the hubs are installed, and in the piston a spring-loaded pin is inserted, alternately entering the gear wheels through a longitudinal hole in the cylinder liner, while the gears are kinematically connected with the drive sprocket of the zevochnogo engagement.

In addition, the length of the longitudinal bore in the cylinder liner is less than the stroke of the pneumatic cylinder piston.

FIG. 1 shows the installation from the side of the turntable, general view; in fig. 2 — the same in FIG. 3 — view along arrow A in FIG. 2; in fig. 4 shows section B-B in FIG. 3; on -fig. 5 is a view along arrow B in FIG. 2. -iThe installation for resistance welding contains rotary table 2 mounted on the base 1 and the mechanism of step 3 of the movement.

The rotary table 2 is mounted with a copier 4c driven by the flank 5, brackets with a lever 6, a piston drive 7 limit switches 8, a sensor 9 to finish the welding cycle and a cradle 10, on which is mounted a clamp 11 fixing the welded part 12.

The stepper movement mechanism 3 comprises guides 14 and 15 mounted on the support 13 and a carriage 16 having the possibility of reciprocating relative to the support 13 on the gear wheels 17 installed in ball separators 18. The gear wheels 17 are meshed with depressions in the guides 14 and 15.

On the carriage 16 are mounted contact welding tongs 19 pivotally connected to a piston drive 20 of vertical movement and a piston drive 21 of a gear wheel 22 interlocked with ratchet wheels 23 and 24, bearing a link 25, mounted on a disk 26 / having a possibility of rotation relative to the gear wheel 22 A pawl 27 is mounted on the axis of the earring 25, interacting with the ratchet wheel 24., and on the top cover of the carriage 16, dogs 28 and 29 interacting respectively with the ratchet wheels 23 and 24. Dogs 27, 28 and 29 are preloaded Springs 3 & wheels.

In the cover and body of the carriage 16, having supply channels for compressed air, there is a piston actuator, the sleeve 31 of which is designed as an axis of gear wheels 32 and 33, and has the possibility of rotation on the latter. On the shank of the sleeve 31, the gear 34 is rigidly fixed, which engages with the gear 22, and in the body of the sleeve there is a longitudinal groove in which a spring-loaded pin 35 mounted in the piston 36 interacting with the grooves of the hubs of gears 32 and 33 is installed. the protruding part of the carriage 16 is mounted toothed wheels 37-42, of which the toothed wheel 41 is parasitic, is in constant engagement with the toothed wheels 33 and 42,

On the shaft of the gear wheel 49 is fixed an asterisk 43, coaxial with which on. The bearing has a cam roller 44 placed in the groove of the copier 4. The driving sprocket 43 is in constant engagement with the pendants 5 installed in the cam 4.

The installation works in the following way.

The welded unit 12, mounted on the lodgement 1b under the contact welding tongs 19, is fixed by the clamp 11. When the piston actuator 21 is turned on, the stud 25, rotating together with the disk 26, pawl 27 acts on the ratchet wheel 24, which, turning a step, is fixed by the pawl 29. The rotation of the gear wheel 22 is transmitted to the sleeve 31 of the piston drive, the nopuieHb 36 of which, under the action of compressed air directed into the upper cavity of the pneumatic cylinder, moves to the lower position. Spring pin 35, interacting with the groove of the hub of the gear wheel 32, transmits the rotation of the gear wheels 37, 38, 39 and 40 and the drive sprocket 43, which moves the rotary table 2. At the same time, the gear wheel 33 slips on the bearings relative to the sleeve 31.

After switching the piston drive 21, the pawl 28 secures the shaft with the gear wheel 22, and the pawl 29 is disengaged. The leading sprocket 43 stands up and is welded with tongs 19. Then, step-by-step feeding of the turntable 2 is repeated, followed by reciprocating movements of the carriage 16 relative to the support 13 of the carriage 16, depending on the profile of copier 4; permanently aligned with the groove of the copier 4.

When the stop reaches the end 5, the switch 8, the copier roller 44, in the process of moving the turntable 2, the piston drive 7 of the tilt angle, the welded assembly 12 and the piston drive 20 are activated;

the movement of the welding jaws 19 and the places of the stepped transition of the planes to be welded, and when the sensor reaches the end of the welding cycle, the piston-type drive 21 of the stepping mechanism is activated. At the same time, the compressed air supply is switched to the lower cavity of the sleeve 31 under the piston 36.

After the next welded panel is installed and the piston actuator 21 of the piston is turned on.36, moving to the upper part of the sleeve 31, the spring-loaded pin 35 interacts with the groove of the gear wheel 33, which, through the gears 41, 42, 38, 39. and 40, transmits the rotation to the sprocket 43 moving the turntable 2 in the opposite direction. In this way, the turntable 2 is reversed and the panel is welded along a path opposite to the original. The presence in the step-by-step movement mechanism of a two-cavity cylinder, in the piston of which a spring-loaded pin is mounted, which interacts with the grooves of the gear wheels, simplifies the design and increases the reliability of the installation.

To prevent wear of the sealing elements on the piston of the pneumatic cylinder, the length of the longitudinal hole in the cylinder liner is less than the stroke of the piston, which prevents leakage of compressed air through the longitudinal hole in the event that the piston moves to its extreme position.

Claims (3)

1. An installation for resistance welding, containing a welding clamp installed on the base, a rotary table with a lodgment, a copier and tsivki, a kinematically associated table pitch movement mechanism with a copy roller and a leading sprocket, which is different to ensure the reversal of the rotary table and the implementation of welding during the reverse course, the mechanism for the step movement of the table is equipped with a two-cavity cylinder, on the hilt of which there is a longitudinal hole and mounted on gears 5 wheels with grooves on the hubs, and a spring-loaded pin mounted in the piston, which enters alternately into the grooves of the gears through a longitudinal hole in the cylinder liner, while the gears to: inmatically connected with the drive star gear of the hitch linkage. 2. Installation according to claim 1, characterized in that the length of the longitudinal hole in the cylinder liner is less than 5 the stroke of the pneumatic cylinder. Sources of information taken into account in the examination 1. Author's certificate of the USSR K 466082, cl. At 23 K 11/10, 1973. 0 2. USSR author's certificate number 438510, cl. 23 K 37/04, 1972. 3. USSR author's certificate According to the application number 2595160, cl. At 23 K 11/10. 03.28.78. view A M Z1 3 16 IS U1 L 28 gZ ffl kl f In