RU2384379C2 - Control unit for welding angle - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: device is implemented with ability of placement between ending through-pass rollers (3a, 3b) with ribs and clamping roller (5b) which are used during manufacturing of welded pipe. Device contains stands (30, 31) implemented with ability of placement between stand (40) supporting ending through-pass rollers (40) supporting ending through-pass rollers and stand supporting clamping rollers. One ends of top levers (21) are pivotally supported by top bearing brasses. One ends of bottom levers (22) are pivotally supported by bottom bearing brasses. And other ends are connected to other ends of top levers with formation of lever motion (20). Roller (24) with rib is installed with ability of rotation in place of connection of top and bottom levers and is implemented with ability of introduction between opposite ends of belt material (1). Top and bottom bearing brasses are held with ability of sliding so that it is provided regulation of roller position with rib in vertical plane, formed by vertical direction and linear direction of pipe manufacturing.

EFFECT: simplifying mechanism of device and reducing erection space, there are significantly improved conditions of operation of the device and there are reduced consumptions for maintenance.

8 cl, 7 dwg

Description

FIELD OF THE INVENTION

The present invention relates to a device for controlling the angle of welding formed by the opposite edges of the tape steel from the weld point of both edges of the tape steel during the welding process during the manufacture of the steel pipe with a weld, and more particularly to a device and method for controlling the angle of welding, which makes it easy to set appropriate welding angle to ensure and maintain high quality welding.

State of the art

A steel pipe with a welded seam is made by a method in which tape steel is deformed by means of a group of rollers so as to obtain a circular cross section with a hole, and the opposite edges of the tape steel are heated and welded by using electrical resistance. However, it is well known that the quality of the finished product largely depends on the quality of the welded part.

The so-called welding angle between both heated edges of the steel strip, alloyed by the compressive action of the pressure rollers, is included in many indicators that are important for the quality of the welded part. In general, when the welding angle becomes stable and significant, it is easy to create welding conditions under which the welding operation at the connection point becomes stable and various welding defects are unlikely to occur.

To stabilize the welding angle and reliably obtain the required size, a method is known in which a roller with a rib having a predetermined width is installed between the end feed rollers with ribs and pressure rollers and inserted between opposite edges of the steel strip.

Patent Document 1: Japanese Patent Publication No. 6-277751A.

Patent Document 2: Japanese Patent Publication No. 5-16952B.

Patent Document 3: Japanese Patent Publication No. 61-034908B.

Disclosure of invention

The problem solved by the invention

A roller with a rib is located between the end feed rollers with ribs and pinch rollers. A roller with a rib is often used in a so-called fixed-type device to control the angle of welding, in which a roller assembly having a roller shaft with a rib and a bearing shell is attached to a conventional bed, and the position of the roller with the rib can only be adjusted in the vertical direction, and so on. called a floating type device for controlling the angle of welding, in which the position of the roller with the rib is adjusted in a linear direction.

In a floating type device for controlling the welding angle, a problem may arise due to the fact that the support mechanism and the control mechanism of the roller with the rib are more complex and have a disadvantage regarding space compared to a fixed type device for controlling the welding angle. In such a floating-type device, the roller assembly is attached to a conventional bed to allow sliding in the vertical direction by using a clamping assembly attached to the bed. In addition, a sliding mechanism is located between the bed and the base to support the bed. Accordingly, the position of the roller with the rib can be controlled in a linear direction by moving the entire frame in a linear direction.

In a floating type device for controlling the angle of welding, since the bed is not attached directly to the base, it is necessary to create a sliding mechanism that is durable and very accurate, or an additional mechanism that reduces the clank of the sliding mechanism. Accordingly, it is necessary to provide significant space for mounting the sliding mechanism or additional mechanism between the end-passage rollers with ribs and pressure rollers.

In addition, since the floating type device for controlling the welding angle is located close to the zone in which the welding process is performed and is in difficult conditions with a spread of spray, it is difficult to protect the sliding mechanism and keep it in good condition. To provide space for the welding process, it is necessary to install the bed away from the bed of pinch rollers at a predetermined distance. Due to interference from the bed, a device with a current transformer or the like in the welding unit, as well as other peripheral units, there may be a problem in that the roller with the rib will not fit the pressure rollers, so that the necessary welding angle will not be guaranteed.

In particular, in the case of an induction welding operation, an induction coil is located between the roller with the rib and the pinch rollers. For this reason, when the roller with the rib approaches the coil, many mechanical elements, including the bed, undergo strong induction and, consequently, the welding efficiency can significantly deteriorate. Accordingly, in many cases it is not possible to move the roller with the rib to a predetermined position due to a problem that needs to be fixed.

Due to problems caused by the installation space, operating conditions, interference from the welder, induction heating, and the like, when a floating type device is used to control the welding angle, the distance between the end passage rollers with ribs and pressure rollers increases significantly, and the effect of the camera or similar, regarding steel strip, increases, which can adversely affect the safety of the welding operation.

In the end, when using a fixed type device to control the angle of welding, the control of the position of the roller with the rib will not be flexible. Accordingly, in many cases, the required performance will not be achieved. In principle, a floating type device can solve many problems of a fixed type device. However, in such a mechanism, the control of the position of the roller with the rib in the linear direction is limited by many factors, and therefore it is impossible to achieve the required performance.

The purpose of the invention is to provide a device and method for controlling the angle of welding, which can remove the restrictions that occur when using the known device of the floating type to control the angle of welding, and as far as possible provide the advantages of the device of the floating type by using new support and adjusting mechanisms.

The way to solve the problem

The inventors studied a device for controlling the angle of welding and found that the known supporting and adjusting mechanisms of a roller with a rib cannot provide the advantages of a floating type device for controlling the angle of welding. For this reason, the authors developed the invention.

In order to achieve the desired performance of the rib roller, it is very important to use the appropriate width of this roller. That is, when the width of the roller with the rib is less than the natural distance between the opposite edges of the steel strip, it is impossible to achieve the required performance. On the contrary, when the width of the roller with the rib is much larger than the natural distance between the opposite edges of the steel strip, the subsequent welding operation can have a negative effect, namely, that the cross-section configuration, properly formed by forming operations during the passage of the rib, cannot be saved and the edges of the steel tape will be damaged.

The natural distance between the opposite edges is initially limited by the width of the ribs of the final feed rolls with ribs. In general, since the corresponding rib width of the feed rolls with the ribs is different depending on the diameter of the product, the natural distance between the edges varies significantly depending on the diameter of the product. In addition, even in the case when the width of the rib of the roller with the rib is the same, the natural distance between the opposite edges is different depending on the thickness and quality of the material, and the degree of deformation due to the effect of elastic recovery.

For this reason, it is very difficult to predict the natural distance in advance. Accordingly, there is no method other than calculating the optimal width of the roller with the rib depending on the diameter, thickness and material of the product by trial and error. However, in the actual execution of the operation, it is impractical to determine the optimal width of the roller with the rib by using such a complex method. Accordingly, it is known that the generally accepted method is not sufficiently used in the actual execution of the operation.

To solve the problems described above, a floating type device for controlling the angle of welding has the following advantages. In general, the natural distance between the edges becomes somewhat larger due to the effect of elastic recovery immediately after the edges pass through the end-passing rollers with ribs, but becomes smaller in the direction of the pressure rollers. Since the position of the roller with the rib can be adjusted in a linear direction, it is possible to insert the roller with the rib between both opposite edges of the steel strip at the point where the width of the roller with the rib can be entered at the most acceptable distance between the edges, taking into account the change in the distance between the edges.

In addition, in the actual execution of the operation, even if the width of the roller with the rib is not accurately predicted, it is easy to find the position of the roller with the rib, allowing to provide the desired performance by controlling the position in the linear direction. Of course, this method can be implemented precisely by providing a compatible roller with a rib having a different rib width instead of a plurality of single rollers with ribs depending on the types of products.

In addition, the resulting welding angle will be different according to the width of the roller with the rib and the place of its introduction, that is, the distance between the pressure rollers and the roller with the rib. When the place of introduction of the roller with the rib is fixed and the diameter of the product is small, the natural distance between the edges is less than the natural distance for the product of large diameter. Accordingly, the width of the roller with the rib, which has a small width, cannot be used advantageously, and in many cases the resulting welding angle will be much smaller than the welding angle of the product with a large diameter.

Moreover, when the insertion point of the roller with the rib can be adjusted, a large welding angle can be obtained even in the case of a small diameter product by using a roller with a rib of small width in a position close to the pressure rollers. However, as described above, the supporting and adjusting mechanisms of the roller with the rib have a structural problem and also have a functional problem, which prevents the benefits that should be obtained initially.

The authors believe that the main reason why there are many limitations regarding the known floating-type device for controlling the angle of welding is that a change in the regulation of the roller with the rib in the linear direction is achieved by moving the bed supporting the roller with the rib. Accordingly, in the invention, a link mechanism capable of converting changes in a different direction to a change in a linear direction is used as a support and adjusting mechanism of a rib roller instead of the known mechanism in which a change in regulation is provided directly in a linear direction.

More specifically, a roller with a rib is attached to a link mechanism including two levers pivotally connected to each other in a plane formed by a linear direction and a direction perpendicular to it. Then, for example, the positions of the gripping points A and B of the two levers in the vertical direction are controlled so as to control the position of the roller with the rib in the plane. Based on the change in regulation of the gripping points A and B, it is possible to obtain a change in the regulation of the roller with the rib in the vertical direction and in the linear direction.

According to the invention, there is provided a device for controlling the angle of welding, configured to control the angle of welding by introducing a roller with a rib between the opposite edges of the steel strip into an adjustable position, which is located on the side upstream of the pressure rollers used in the manufacture of the welded pipe. The device for controlling the welding angle comprises a linkage mechanism in which the roller with the rib is rotatably supported at the junction or close to the junction of the two gear levers, and the end (grip point) of at least one of the two gear levers is movable so that the regulation of the position of the roller with the rib in a plane formed by the linear direction of pipe production and the direction perpendicular to it is ensured.

The invention also provides a device for controlling the angle of welding, configured to control the angle of welding by introducing a roller with a rib between the opposite edges of the steel strip in an adjustable position, which is located between the end passage rollers with ribs and pressure rollers used in the manufacture of the welded pipe. A device for controlling the welding angle includes: a bed containing a pair of upper and lower bearing shells, configured to adjust each position; a pair of upper and lower levers made so that some of their ends are pivotally supported by respective bearing shells, and the other ends are connected to each other with the formation of a lever mechanism; a roller with a rib supported rotatably at or near the junction of the levers.

The invention also provides a method for controlling the welding angle by introducing a roller with a rib between opposite edges of the steel strip in a position that is on the side upstream of the pinch rollers used in the manufacture of the welded pipe. The method includes: attaching a roller with an edge to the linkage mechanism, in which two levers are rotatably connected in a plane formed by the linear direction of pipe production and the direction perpendicular to it; changing the positions of the gripping levers to adjust the position of the roller with a rib in the plane.

Advantage of the invention

In the case of a linkage according to the invention, the position of the roller with the rib can be controlled in a linear direction without moving the support frame. Accordingly, it is possible to provide the following advantages (1) to (3).

(1) Since the position of the bed can be fixed and the sliding mechanism in the linear direction is optional, the device mechanism is simplified and the mounting space becomes smaller. In addition, operating and maintenance costs can be significantly reduced.

(2) Since the restriction due to interference and induction from the welding unit is significantly reduced, it is possible to move the roller with the rib as close as possible to the pressure rollers.

(3) The distance between the end feed rollers with ribs and the pressure rollers is reduced as much as possible, so that it is possible to effectively suppress the effects caused by the use of a control device that causes, for example, an unstable welding operation.

According to the device and method for controlling the angle of welding, which are made in accordance with the invention, the above-described required operating characteristics of the device can be easily achieved as the final result of the advantages described above.

Preferred Embodiment

Next, an embodiment of the invention will be described with reference to the drawings. In the drawings, the same or corresponding elements will be denoted by the same reference numerals, with no repeated explanations being given. The welding angle, as shown in figure 1, refers to the angle θ between the opposite edges 2 of the tape steel 1, which are suitable for the butt weld point P, that is, to the position where the opposite edges 2 of the heated tape steel 1 are fused to each other by means of a pressing operation performed by pinch rollers (not shown).

To control the angle of welding, a roller with a rib 4 is installed between the end passage rollers 3a and 3b with ribs and the pressure rollers 5a and 5b, and then a roller 4a or 4b with a rib having a predetermined width, as shown in Fig. 2B, is inserted between opposite edges steel tape 1.

As shown in FIG. 3, the natural distance between the opposite edges becomes slightly increased due to the effect of elastic recovery immediately after the edges pass through the final feed rollers 3a and 3b with ribs, but becomes smaller in the direction of the pressure rollers 5a and 5b. In this case, if the position of the roller with the rib can be adjusted in a linear direction, you can enter the roller with the rib between the opposite edges of the steel strip at a place where the width of the roller with the rib is consistent with the distance between the opposite edges, which varies, as described above.

Typically, as shown in FIG. 4, a roller assembly including a roller shaft with a rib and a shaft bearing sleeve 7 is attached to an ordinary frame 6, wherein the roller assembly has vertical pressure sliding by using a pressure assembly 8 attached to the frame 6 . In addition, between the frame 6 and the base 9 supporting the frame 6, a sliding mechanism is installed, while the entire frame 6 has the ability to move in a linear direction. However, the adjustment deviation of the roller 4 with the rib in the linear direction is carried out precisely by moving the bed 6, and this creates many limitations.

The invention uses a linkage mechanism in which a deviation in a different direction is converted into a deviation in a linear direction instead of an arrangement in which case an adjustment deviation in a linear direction is directly provided. That is, as shown in the schematic view according to FIG. 5, the roller 14 with the rib is attached to the link mechanism 10, which includes two levers 11 and 12, which are connected to each other with the possibility of rotation in the plane formed by the vertical direction (up / down) and linear direction (left / right).

In other words, there is a crank mechanism that includes two levers 1 and 12. The roller 14 with the rib is rotatably supported at the junction of the two levers 11 and 12, and in this case, at least one end (the grip point) of the two levers 11 and 12. Accordingly, it is possible to adjust the position of the roller 4 with an edge in the plane by adjusting the positions of both of the grip points 13A and 13B of the two levers 11 and 12 in the vertical direction.

The arrangement of the linkage 10 is not specifically limited. The roller 14 with a rib is rotatably supported at the junction of the levers 11 and 12, but can be rotatably supported at a location on the far side downstream in the linear direction, or at a location on the far side upstream in the linear direction levers to the junction. In the figures, the junction is located on the more distant side downstream in a linear direction than the grip point. However, it is possible to provide a reverse configuration such that the gripping point is located on the more distant side downstream in the linear direction than the junction.

6 shows an example of a welding angle control device according to an embodiment of the invention. In the lever mechanism 20, the upper arm 21, including a pair of shoulders (21a and 21b), and the lower arm 22, including a pair of shoulders (22a and 22b), are rotatably connected to each other via a hinge 23. In this case, both ends of the shaft 25 of the roller 24 with an edge to the shoulders (21A and 21b) of the upper arm 21 are attached bearing shells 26.

The upper arm 21 and the lower arm 22 are pivotally connected to the horizontal shafts of the bearing shells 27 and 28, which are slidably held in the U-shaped grooves of the pair of beds 30 and 31, thereby forming the support points (grip points) of the pair of arms (21a and 21b) and (22a and 22b) of the linkage 20. Although the sliding bearing shells 27 and 28 are able to slide vertically in the frames 30 and 31, their position can be adjusted or maintained by using screw jacks 32.

The beds 30 and 31 can be located on the side downstream of the final feed rolls with levers by arranging them of a well-known independent type. In addition, the frames 30 and 31 can be attached to the frame of the final feed rolls with ribs. In this case, it seems possible to significantly reduce the installation space while ensuring the safety of the device. In addition, beds 30 and 31 can be attached to the sides upstream of the bed of pinch rollers.

In the device according to the invention for controlling the welding angle, the bed can be made in the form of a well-known bed, provided that the layout of the lever mechanism described above can be determined taking into account the locations of various nodes on the proximal side of the pressure rollers, and the necessary functions can be provided for linkage 20.

Option 1

As indicated by 50 in FIGS. 7A and 7B, the welding angle control device shown in FIG. 6 is configured such that the frames 30 and 31 are rigidly attached to the sides on the side downstream of the frame of the end feed rolls 40 s ribs in a linear direction (direction from left to right). Accordingly, it is possible to provide the smallest possible installation space with a guarantee of the safety of the control device 50. In addition, since the sliding surface of the sliding bearing shells and the bed is far away from the zone in which the welding operation is performed, optimal operating conditions can be ensured.

As shown in FIG. 7A, when both bearing shells 27 and 28, that is, the gripping points of both levers 21 and 22, are moved so as to be close to each other, the roller 24 with the rib moves close to the pinch rollers 5b on the downstream side . On the contrary, when both the sliding bearing shells 27 and 28 are moved so that they are spaced apart from each other, the roller with rib 24 moves to the near-end rib rollers 3a and 3b.

It is evident from FIG. 7A that even in a position in which the roller 24 with the rib is moved as close as possible to the pressure rollers 5a and 5b, the device 51 with a current transformer, an induction coil 52 (see also FIG. 4) or the like, all of the above does not interfere with the welding unit and, therefore, the mechanical element, which can be largely heated by means of an induction coil, will be limited. Accordingly, it is easier to provide the space required for the welding operation.

In the conventional device shown in FIG. 4, since the roller assembly of the roller 4 with the rib is attached to the frame 6, it is necessary to open / close the upper part of the frame 6 or to attach the clamping assembly to the roller assembly, or to disconnect it from the roller assembly when replacing the roller 4 sec rib. However, in this embodiment, since the roller assembly is changed in a different area from the location of the beds 30 and 31, there is no need for access to the pressure assembly, therefore, the replacement operation is greatly simplified.

Industrial applicability

According to the invention, it is possible to simply maintain an appropriate welding angle in order to ensure optimum welding quality during the manufacture of various welded pipes for which the welding angle must be controlled, in addition to steel pipes with a weld, regardless of the welding method, for example laser welding.

Brief Description of the Drawings

Figure 1 is a perspective view of a steel strip and pipe for explaining the angle of welding.

Fig. 2A is a view for explaining the relative arrangement of the final feed rolls with ribs, the roll with rib and the pinch rollers.

Fig. 2B is a view showing steel strip when viewed from a linear direction to explain the operation of setting the welding angle by using a roller with a rib.

Figure 3 is a view explaining a change in the distance between the opposite edges of the steel strip in place between the final feed rolls with ribs and pressure rollers.

4 is a perspective view showing an arrangement of a conventional floating type device for controlling the angle of welding.

5 is a view showing the levers forming a mechanism for adjusting the position of a roller with a rib according to the invention.

6 is a perspective view showing an embodiment of the invention.

7A and 7B are views showing end feed rollers with ribs, a roller with rib, and pinch rollers according to an embodiment of the present invention.

Description of reference numbers and symbols:

P - butt welding spot;

1 - tape steel;

2 - edge (tape steel);

3a, 3b - feed roller with rib;

4, 4a, 4b, 14, 24 — a roller with a rib;

5a, 5b — pinch roller;

6, 30, 31 - bed;

7, 26 - a bearing insert of a shaft;

8 - clamping unit;

9 - base;

10, 20 - lever mechanism;

11, 12, 21, 22, 21a, 21b, 22a, 22b - lever;

13A, 13B - capture point;

21 - upper arm;

22 - the lower lever;

23 - hinge;

25 - roller shaft;

27, 28 - bearing insert, providing sliding;

32 - screw jack;

40 - bed of the feed roller with a rib;

50 - controller;

51 - device with a current transformer;

52 - induction coil.

Claims (8)

1. A device (50) for controlling the angle of welding, arranged to be located between the end bore rollers (3a, 3b) with the ribs and pressure rollers (5a, 5b) used in the manufacture of the welded pipe, while the device for controlling the angle of welding contains beds (30, 31), arranged to be located between the bed (40) supporting the end-passage rollers and the bed supporting the pinch rollers, the bed comprising a pair of upper and lower bearing shells (27, 28), upper arms (21a, 21b), one to the ends of which are pivotally supported by upper bearing shells, the lower arms (22a, 22b), one ends of which are pivotally supported by lower bearing shells, while the other ends are connected to other ends of the upper arms to form a linkage (20), and the roller (4) with a rib, mounted rotatably at the junction of the upper levers and lower levers and made with the possibility of introducing between the opposite edges (2) of the tape material (1), while the upper bearing shells and lower bearings e inserts slidably held in the frame such that an adjustment of the position with the edge roller in a vertical plane defined by the vertical direction and linear direction of manufacture of the pipe. 2. The device according to claim 1, in which the beds are located on the side downstream of the bed supporting the end-passing rollers with ribs in the linear direction of pipe production, and are independent. 3. The device according to claim 1, in which the frame is attached to a frame that supports the final passage rollers with ribs. 4. The device according to claim 1, in which the frame is mounted on the side upstream of the frame supporting the pressure rollers in the linear direction of manufacture of the pipe. 5. A device (50) for controlling the angle of welding, arranged to be located between the end bore rollers (3a, 3b) with the ribs and pressure rollers (5a, 5b) used in the manufacture of the welded pipe, while the device for controlling the angle of welding contains beds (30, 31), arranged to be located between the bed (40) supporting the end-passage rollers and the bed supporting the pinch rollers, the bed comprising a pair of upper and lower bearing shells (27, 28), upper arms (21a, 21b), one to the ends of which are pivotally supported by upper bearing shells, the lower arms (22a, 22b), one ends of which are pivotally supported by lower bearing shells, while the other ends are connected to other ends of the upper arms to form a linkage (20), levers attached to the junction of the upper arms and lower levers, and a roller (4) with a rib, supported with the possibility of rotation of the levers in the position on the side upstream or side downstream from the junction in the linear direction of manufacturing s, the roller with the rib is made with the possibility of introducing between the opposite edges (2) of the tape material (1), the upper bearing shells and the lower bearing shells being held so that they can slide in the frames so that the position of the roller with the rib in the vertical plane is controlled, formed by the vertical direction and the linear direction of the pipe. 6. The device according to claim 5, in which the frames are located on the side downstream of the frame, supporting the final feed rolls with ribs in the linear direction of the pipe, and are independent. 7. The device according to claim 5, in which the frame is attached to a frame that supports the final passage rollers with ribs. 8. The device according to claim 5, in which the frame is mounted on the side upstream of the frame supporting the pressure rollers in the linear direction of pipe manufacture.

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