RU2246385C2 - Machine for butt welding of strips - Google Patents

Abstract

FIELD: welding processes and equipment, namely machines for butt welding of strips, possibly used in aggregates for electric welding of tubes and shape bending aggregates for welding ends of coiled strips to endless band.

SUBSTANCE: machine for butt welding of strips includes H-like housing having in upper portion recesses for mounting mechanisms for drawing together, clamping and centering. Said mechanisms are mounted on two spring-loaded slides that may perform horizontal motion. Body of hydraulic cylinder is mounted in mean portion of housing. Stationary cutters are mounted in upper part of hydraulic cylinder body. Guides are mounted at lateral sides of hydraulic cylinder body. Movable cutter has connecting strip in its mean portion and two cutting edges with mutually opposite inclination angles. Movable cutter moves on guides of hydraulic cylinder body by means of tie rods and cross piece secured to rod of hydraulic cylinder. Body of shears is kinematically joined with mechanisms for drawing together through gages secured to its outer vertical sides and through rollers mounted on slides. Welding apparatus is mounted in mean part of machine over movable cutter.

EFFECT: lowered size, material consumption, enhanced accuracy of joining ends of welded strips, improved capability for repair works.

3 cl, 5 dwg

Description

The invention relates to the field of welding, and more specifically to machines for butt welding of strips, and can be used in pipe welding and roll forming units for welding the ends of rolled strips into a continuous strip.

A known machine for butt welding of strips, see.with. USSR No. 625867, cl. At 23 K 11/04, decl. 06/02/76, publ. 09/30/78

The known machine contains a bed consisting of pivotally connected stationary and movable parts, reduction, clamping and centering mechanisms, scissors with a hydraulic cylinder, movable and fixed knives. The reduction mechanism is made of two pivotally connected parts of the bed. The clamping mechanism is made in the form of lower current-carrying jaws and upper clamping jaws (electrodes), and the welding device is in the form of a transformer with lead-in tires. For transporting strips from the cutting position to the welding position, movable carriages with clamps are used.

The disadvantage of this machine is its considerable dimensions, metal consumption, manufacturing and operating costs, due to the fact that for transporting the ends of the strips from the cutting position to the welding position, the machine is equipped with two carriages with clamps, and the hinge (axis of rotation) on a fixed bed for almost rectilinear movement of the ends of the strips during welding requires a significant distance (more than 1 m) from the welded strips to the hinge.

Another disadvantage of the known machine design is the low quality of the welded joint, since it is not possible to accurately set the ends of the strips before welding due to the low stiffness of the movable carriages made in the form of a four-link linkage.

Of the known machines for butt welding of strips, the closest in technical essence is a butt welding machine for strips, described in USSR patent No. 1795932, class. At 23 K 11/00, declared 04/13/90, publ. 02/15/93

This machine contains a bed, reduction, clamping, centering mechanisms, scissors with a body, a hydraulic cylinder, movable and fixed knives, and a device for welding. The information mechanism is made in the form of single-arm lever racks pivotally mounted on a bed with a drive from a hydraulic cylinder. The clamping mechanism is made in the form of two-arm levers driven by a hydraulic cylinder pivotally mounted on one-arm lever racks. The scissors hydraulic cylinder is located inside the machine.

A disadvantage of the known design of the machine for butt welding of strips is that it has significant dimensions, material consumption, manufacturing cost. This is due to the use of a hinge (axis of rotation) and single-arm linkages of the mechanism for reducing the ends of the strips. To a large extent, the dimensions and material consumption of the machine increase due to the sequential vertical layout of the movable knives, slide and scissors hydraulic cylinder.

Another disadvantage of the known design of the machine for butt welding of strips is not a high level of maintainability due to the placement of the hydraulic cylinder of scissors inside the machine. To replace the sealing lips on both the stem and piston, disassembly and assembly of not only the hydraulic cylinder, but also the machine is required.

In addition, the lever-hinged version of the implementation of the reduction mechanism requires to ensure the necessary accuracy of combining the ends of the strips (up to 1 mm thick) with a higher accuracy class for the manufacture of their elements. Significant dimensions, material consumption, low maintainability, simultaneous cutting of the two ends of the strip increases the cost of both manufacturing and operation of the welding machine.

The objective of the present invention is to provide a machine for butt welding of strips, which allows to reduce the size and material consumption and increase the level of maintainability.

The task is achieved by the fact that in the machine for butt welding of strips containing the bed, the mechanisms of information, clamping and centering, scissors with a body, a hydraulic cylinder, movable and fixed knives, and a device for welding, according to the invention, the bed is made of an H-shape with pockets in the upper part, it is equipped with two spring-loaded sliders mounted with the possibility of horizontal movement in the said pockets, carrying mechanisms of information, clamping and centering, and kinematically connected with the body of scissors, a vertical hole is made in the middle part of the bed for fastening the hydraulic cylinder of scissors, while fixed knives are installed in the upper part of the hydraulic cylinder body, and a movable knife on the scissor body made with the possibility of vertical movement along the guides provided on the hydraulic cylinder body using rods and a beam fixed to the rod of this hydraulic cylinder.

The kinematic connection of the spring-loaded sliders with the body of scissors is made in the form of rulers mounted on the outer vertical sides of the body of scissors, and two rollers mounted on the sliders.

The movable knife in its middle part is equipped with a jumper and is made with two cutting edges with opposite angles of inclination.

Such a constructive implementation of the machine for butt welding of strips will reduce the size and material consumption.

This is achieved due to the implementation of the H-shaped bed with pockets in the upper part and the placement of two spring-loaded sliders with mechanisms of information, clamping and centering, due to the placement of fixed knives in the upper part of the hydraulic cylinder, rigidly fixed in the vertical hole of the bed, and movable in the body of scissors moving along the guides provided on the hydraulic cylinder body.

The implementation of the reduction mechanism in the form of springs, interacting by means of two rollers mounted on sliders, with rulers located on the outer vertical sides of the shear body, will reduce the cost of manufacturing and operating the welding machine.

The fastening of the scissors hydraulic cylinder in the middle part of the bed cross-member (in the horizontal part of the letter “H”) with the stock down, due to its good availability, will reduce the time and cost of maintenance and increase the maintainability level.

The arrangement of the reduction, clamping and centering mechanisms in the closer zone to the junction of the welded strips in a stiffer H-shaped bed improves the accuracy of alignment of the ends of the welded strips while reducing the accuracy class of their manufacture.

The implementation of a movable knife with a jumper in the middle part and two cutting edges with opposite angles of inclination will reduce the width of the trim as much as possible and halve the cutting gain.

To explain the invention, a specific embodiment of the invention is provided below with reference to the accompanying drawings, in which:

figure 1 - shows a machine for butt welding of strips;

figure 2 is a view along arrow a in figure 1;

figure 3 is a section bB in figure 2;

figure 4 - section bb in figure 2;

figure 5 - section GG in figure 1.

The machine for butt welding of strips contains an H-shaped bed 1, in the upper part of which pockets 2 are made, in which two reduction, clamping and centering mechanisms are mounted on two spring-loaded sliders 3 that can be moved horizontally.

The reduction mechanism is made in the form of springs 4. The clamping mechanism is made in the form of 3 two-arm drive levers pivotally mounted on sliders 5. The centering mechanism is made in the form of rollers 6.

A vertical hole 7 is made in the middle part of the bed 1 (in its cross member), in which the body 8 of the hydraulic cylinder 9 of the scissors 10 is rigidly fixed. Fixed knives 11 are mounted on the body 8 in its upper part, and the guides are on the sides 12. The movable knife 13, equipped with the upper part with a copper shoe 14, and in the middle part with a jumper 15 and made with two cutting edges 16 with opposite angles of inclination, mounted on the body 17 of the scissors 10, made with the possibility of vertical movement along the guides 12 using rods 18 and the crosshead 19, are fixed x on the rod 20 of the hydraulic cylinder 9. The housing 17 of the scissors 10 through kinematically connected to the information mechanisms through the rulers 21 and the rollers 22 mounted on the sliders 3 fixed on its outer vertical sides.

Above the movable knife 13 in the middle part of the machine, a device 23 for welding is mounted, and inside the machine on the right and left - inclined grooves 24 and duct 25 for guiding and collecting the trimmings.

The machine operates as follows.

After transporting the rear end of the strip 26 beyond the axis of the machine, the strip stops and is centered by the rollers 6 of the centering mechanism. The housing 17 of the scissors 10 rises to align the jumper 15 with the level of the strip 26. Then the rear 26 and front 27 ends of the joined strips are fed to the stop in the jumper 15 of the movable knife 13. The strips 26 and 27 are pressed by the levers 5 of the clamping mechanism. Then, a command is given for cutting and the movable knife 13, when moving downward, first cuts off the front end of the strip 27 with one cutting edge 16, and then the rear end of the strip 26 with the other cutting edge 16 (see Fig. 3). The trim along the grooves 24 is sent to the box 25. After the movable knife 13 together with the upper plane of the copper shoe 14 falls below the cut ends of the strips 26, 27, the sliders 3 will set the cut ends of the strips exactly along the axis of the scissors 10. The upper surface a copper shoe serves as a welding table (shoe). Then the device 23 for welding with a movable welding machine welds the ends of the strips 26, 27. After welding, the welding machine returns to its original position, the welded strips are released from the clamps. Continuous tape enters the molding device. Next, the cycle repeats.

The proposed machine for butt welding of strips in comparison with the known ones will reduce the size, material consumption and increase the level of maintainability.

Such a design of the machine will improve the accuracy of combining the ends of the welded strips, reduce the width of the trim and halve the cutting force.

The implementation of the machine for butt welding of strips in the manner described above will reduce the cost of its manufacture and operation.

Claims (3)

1. Machine for butt welding of strips, containing a bed, mechanisms of information, clamping and centering, scissors with a body, a hydraulic cylinder, movable and fixed knives and a device for welding, characterized in that the bed is made of an H-shaped with pockets in the upper part, equipped with installed with the possibility of horizontal movement in the said pockets by two spring-loaded sliders carrying the mechanisms of information, clamping and centering and kinematically connected with the body of scissors, in the middle part of the bed is made vertical noe attachment hole scissor jack, the fixed blades are installed in the upper portion of the housing of the hydraulic cylinder, and the movable blade - by scissors body made vertically movable by hydraulic cylinders provided on the housing via the guide rod and the crosshead, attached to the rod of the hydraulic cylinder. 2. The machine for butt welding of strips according to claim 1, characterized in that the kinematic connection of the spring-loaded sliders with the body of scissors is made in the form of rulers mounted on the outer vertical sides of the body of scissors, and two rollers mounted on the sliders. 3. The machine for butt welding of strips according to claim 1, characterized in that the movable knife in its middle part is equipped with a jumper and is made with two cutting edges with opposite angles of inclination.

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