RU2463146C1 - Strip assembling and welding machine - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to production of welded tubes, particularly, to perfection of strip assembling and welding machine incorporated with thin-wall 20-60 mm - dia-tube production stands. Proposed machine comprises housing with clamps and thrust means, strip end drives and welding device. Housing side walls are provided with clamp sliding guides for every end of strips. Every thrust means is made up of one-arm lever. Said lever is coupled via extra lever with turn hydraulic cylinder. Free end of one-arm lever accommodated replaceable stop plate secured thereon. Strip end drives are made up of driving pull-rollers arranged on aforesaid housing. There is welding device over the place of strip's joint, above one-arm leves.

EFFECT: smaller sizes, ease of maintenance, higher reliability.

4 dwg

Description

The invention relates to the production of welded pipes and relates to the improvement of a machine for assembling and welding strips installed in the preparation line for strips of pipe welding mills for the production of thin-walled pipes of small diameter from 20 to 60 mm

A known machine for butt welding of strips, see RF patent No. 2030265, class. B23K 11/00, claimed 04/20/92, publ. 03/10/95, containing a housing made of pivotally connected movable and fixed parts, on which clamps for strips are placed. A hydraulic cylinder is used to divert the moving part. Knives are installed on the fixed part of the body for trimming the ends of the strips. The lower knife is made rotary. A strip centering device is mounted on this bed.

The machine also contains mechanisms for moving the ends of the strips, a welding device and a stripper for simultaneous removal of the upper and lower reinforcements of a weld made by continuous contact flash welding.

Continuous fusion electric contact welding machines, which have an incomparably higher productivity compared to arc welding machines, also have disadvantages associated with the need to ensure a specific pressure of 5 kg per mm ^{2 of} welded section and an average deposition speed of 50 mm / s when upsetting.

First of all, these are increased dimensions, metal consumption, energy intensity, labor intensity and, as a result, high cost.

A large number of technological operations and, as a result, a large number of mechanisms reduce the level of reliability of the welding machine.

In connection with the foregoing, it is economically feasible to use electric contact flash welding machines only for continuous pipe-welding units for pipes with a diameter of 200 ÷ 630 mm, in which the maximum area of the section being welded is 32,000 mm ² , since in the case of using arc welding machines, the welding speed of the longitudinal pipe seam is necessary will reduce by at least 20 ÷ 30%.

Of the known closest in technical essence is a machine for assembling and welding strips, described in RF patent No. 2053085, class. B23K 37/04 claimed 08/01/91, publ. 01/27/96

This machine for assembling and welding strips contains a housing with clamps and abutting means, a mechanism for moving the ends of the strips and a welding device.

Clips are located on movable supports in the form of tables rotatable from hydraulic cylinders. Between the movable supports is placed a slider moving from the hydraulic cylinder. Fixed knives are placed on the body, and movable, pairwise forming scissors for cutting the front and rear ends of the strips and shoe are placed on the slider. In the zone of junction of the strips, a welding device is placed on top.

The machine is designed for arc welding of strips and can be used in continuous pipe-welding units of medium diameter (76 ÷ 219), when the ends of the ends of the welded strips are not perpendicular, taking into account the rib curvature of the strip according to GOST 82-70 and perpendicularity deviations when cutting the ends of the roll on a longitudinal cutting unit ( АПР) exceeds the value of the allowable technological gap between the ends of the clamped strips in the arc welding machine using a welding wire, and therefore, a cut is necessary before welding the ends of the strips to reduce or completely eliminate the non-perpendicularity of their ends to the axis.

A disadvantage of the known design of the machine for assembling and welding strips is that it has significant dimensions in height, which is associated with a lever kinematic scheme for moving tables with the clamped ends of the welded strips after their simultaneous cutting. For accurate assembly of the ends of strips with a width of 200 to 600 mm, the radius of rotation of the table cannot be less than 1000 mm, which determines the dimensions and weight of the machine.

The next disadvantage is the complexity of the hydraulic cylinder moving the slider with knives and a copper shoe. The hydraulic cylinder has three positions - the upper one is raised, the position when welding the ends on a copper lining, the lower one is below the strip of the workpiece to prevent wear of the copper shoe on which the welding is carried out.

The disadvantage of the machine is also the lack of reliability due to the complexity of the design. In addition, for servicing the scissors hydraulic cylinder, dismantling and subsequent installation of the mechanism of the welding head, tables and scissors is required.

The objective of the present invention is to provide a machine for the assembly and welding of strips, which enables the welding of thin-walled strips used for the manufacture of welded pipes with a diameter of 20-60 mm, and also allows to reduce the dimensions, metal consumption and laboriousness of manufacture and increase its reliability.

The problem is achieved in that in a machine for assembling and welding strips containing a housing with clamps and abutting means, mechanisms for moving the ends of the strips and a welding device according to the invention, sliding guides are placed on the sides of the housing for each end of the strip interacting with the clamps made by P -shaped with lids and with the possibility of vertical movement from hydraulic cylinders mounted on the housing, and each persistent means is made in the form of a one-arm lever connected through an additional lever with a turning cylinder and having an interchangeable stop bar at the free end, in addition, the mechanisms for moving the ends of the strips are made in the form of pulling drive rollers mounted on the housing for each end of the stripe.

Such a constructive implementation of the machine for the assembly and welding of strips will provide the opportunity to weld thin-walled strips used for the manufacture of welded pipes with a diameter of 20-60 mm, and will also reduce the dimensions, metal consumption and labor intensity of manufacture and increase its reliability.

Due to the smaller size of the gap between the ends of the welded ends of the strips according to the normative data compared to the necessary technological gap for welding these strips, as well as due to the proposed composition and constructive design of the mechanisms of the proposed machine, the dimensions, metal consumption, the complexity of the service are reduced and the reliability of the machine for assembly and welding thin-walled strips for the production of pipes of small diameter.

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

figure 1 shows a machine for assembling and welding strips;

figure 2 is the same, plan view;

figure 3 is a section aa in figure 1;

figure 4 is a section bB in figure 3.

The machine for assembling and welding strips contains a housing 1 with clamps 2, 3 and stop means 4, 5, mechanisms 6, 7 for moving the ends of the strips and a welding device 8. On the sides of the housing 1, slide guides 9 are mounted for each end of the strips under the clamps 2, 3, made of a U-shaped form with covers 10 and having a vertical displacement drive from hydraulic cylinders 11, mounted on the housing 1. Each stop means is made in the form of a single-arm lever 12 connected through an additional lever 13 to the turning cylinder 14. On a free to The end of the one-armed lever 12 has a removable bar fixed - stop 15. The mechanisms 6, 7 for moving the ends of the strips are made in the form of pulling drive rollers mounted on the housing 1 for the rear end of the previous strip and the front end of the subsequent strip. The welding device 8 is located above the area of the junction of the strips and above the one-arm levers 12 in the raised state.

The operation of the machine for the assembly and welding of strips is as follows.

In the initial position, the clamps 2, 3 and the single-arm levers 12 of the stop means 4, 5 are raised by means of the hydraulic cylinders 11 and 14. The end of the previous strip with the help of the pulling drive rollers 6 stops in the immediate vicinity of the welding plane. The lever 12 of the stop means 4 by means of the hydraulic cylinder 14 is lowered to the lower position. The end of the previous strip 16 by pulling drive rollers 6 moves to the end of its end against the stop bar 15 and is clamped by a clamp 2 using the hydraulic cylinder 11. After clamping, the lever 12 of the stop means 4 of the hydraulic cylinder 14 rises to the upper position. Then, with the help of the hydraulic cylinder 14, the lever 12 of the stop means 5 is lowered to the lower position. The front end of the subsequent strip 17 is transported using the drive pulling rollers of the movement mechanism 7 to the end stop of the end plate 15 of the stop 15 of the lever 12 of the stop means 5 and is clamped by a clamp 3. the variable thickness of the stop plates 15 between the clamped ends of the strips provides the necessary technological welding gap. Next, the lever 12 of the thrust means 5 rises. A welding device 8 is brought to the clamped ends of the strips and the joint is arc welded in a protective environment. After welding, the machine mechanisms return to their original position.

The proposed design of the machine for assembling and welding strips in comparison with the known ones makes it possible to weld thin-walled strips used for the manufacture of welded pipes with a diameter of 20-60 mm, and also allows to reduce the dimensions, metal consumption and the complexity of the service and increase its reliability.

Claims (1)

A machine for assembling and welding strips, comprising a housing with clamps and abutting means, mechanisms for moving the ends of the strips and a welding device, characterized in that on the sides of the housing for each end of the strip there are sliding guides interacting with the clamps made in a U-shape with covers and having the ability to move vertically from hydraulic cylinders mounted on the housing, and each persistent means is made in the form of a one-arm lever connected through an additional lever to the hydraulic cylinder ohm of rotation and having a stop at the free end in the form of a removable bar, while the mechanisms for moving the ends of the strips are made in the form of pulling drive rollers mounted on the housing for each end of the stripe.

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