JPS5961577A - Electric resistance welding device in spiral steel pipe manufacturing equipment - Google Patents

Abstract

PURPOSE:To facilitate regulation of contact angle of contact chips and keep power supply in good condition by installing a power supply section from a high frequency oscillator to contact chips on a preprocessing turning frame. CONSTITUTION:A high frequency output transformer 15, bus bars 16-1, 16'-1 and contact chips 17, 17' can slide on a sliding base placed on a preprocessing turning frame 4, and the whole power supply section can move back and forth in the direction of advance of a strip by a screw 20, internal thread and an electric motor 22. By this way, the position of contact chips that changes with the change of pipe diameter is changed. The difference between positions in horizontal direction of the pipe side contact chip 17 and strip side contact chip 17' is adjusted by expanding or contracting the piston rod of a cylinder 23.

Description

Detailed Description of the Invention This invention relates to the electrical resistance welding equipment used in the manufacturing process of Suba-Iral copper pipes (two steps), and the power supply position of the contact tip and the contact of the contact tip to the side edge of the spiral pipe and the side edge of the string by changing the size. This relates to electric resistance welding equipment in spiral steel pipe manufacturing equipment whose entire purpose is to easily adjust the angle and maintain a good power supply condition.

The use of electric resistance welding in the spiral pipe manufacturing method is still relatively new, and the equipment used is for straight seam ERW steel pipe production equipment (= one with some modifications, i.e. two electrodes integrated). Therefore, the contact between the strip side edge and the other side edge (pipe side) and the angle adjustment were performed manually, and in order to match the square forming angle peculiar to the spiral pipe manufacturing method ( Second, since it is necessary to manually adjust the contact tip position back and forth, left and right, and to prepare a contact tip that matches the forming angle l1, it cannot be said to be a satisfactory spiral steel pipe manufacturing equipment.

Figure 1 is a schematic diagram showing the power supply part of the current electrical resistance bath welding device, and Figure 2 is the current contact chip.

FIG. 3 is a detailed side view showing the contact shoe and the contact shoe receiver, and FIG. 3 is a front sectional view showing the contact state of the current contact chip in the plate width direction.

Here, 1 is a strip, 2 is a spiral pipe, a processing rotation frame 4 and a delivery rotation frame 5 are connected to a rotation center (3) provided at one end of a fixed forming device 3 on a substrate (2), and are connected to a rotation center (3) provided at one end of a fixed forming device 3. 7' is a high-frequency oscillator, 7 is a high-frequency output transformer, and 8 and 8' are for supplying power to the contact grooves 9 and 9' for welding the strip side edge and the strip side edge. busper, and an insulator is sandwiched between the two so that they do not come into electrical contact.

Adjustment of the position of the contact tip due to changes in the forming angle of the spiral steel pipe (-In this case, movement of the high frequency output transformer 7, buspar 8 and contact tip 9 in the tube axis direction,
In addition to movement in the direction perpendicular to the tube axis, it is necessary to replace the contact tip with a spare contact tip that matches the molding angle. 10. 10' is a contact chip mounting shoe, and 11' is a 7-unit holder. The shoe holder has a spring 14. The contact tips 9, 9' are pulled against the pipe side edge and the strip side edge by rotating Φ with the bolt 12, 12' as a fulcrum and being pulled through 3゜13''f. By changing the pipe diameter, the contact tip strip The height of the side edge hardly changes, but the height of the side edge changes greatly.

In actual work, a plate-shaped liner is inserted into the bottom of the contact shoe 10 on the pipe side to correct uneven contact of the contact tip on the nozzle side due to changing the pipe diameter, but even in this case, it can be used when the pipe manufacturing range is large. It's impossible. In addition, due to uneven contact of the contact strip due to deformation of the pipe side edge and lip side edge in the strip width direction, uneven contact in the traveling direction of the strip and the uneven contact of the strip due to the deformation of the pipe side edge and the lip side edge in the strip width direction cause strong negative marks due to electric discharge due to poor contact. There are disadvantages that occur.

The gist of the present invention is to advantageously solve the above-mentioned problem by installing the power feeding part from the high frequency oscillator to the contact tip on a pre-treatment rotating frame, thereby changing the angle of the power feeding part by changing the forming angle of the spiral steel pipe. In addition, in order to adjust the contact position of the contact tip, the series of power feeding parts from the high frequency output transformer to the contact tip can be moved in a direction parallel to the side edge of the entire strip (2. The contact tip position can be moved independently, making it easier to adjust the relative position of both contact tips.Furthermore, in order to prevent uneven contact of the contact tips due to changing the tube diameter, the height direction position of the contact shoe support rotation fulcrum is changed. By making the bottom surface of the contact shoe a curved surface and setting it in advance to match the edge curvature of both edges, all contact defects of the contact tip in the board width direction can be eliminated and the power supply state can be improved. The goal is to keep it in good condition.

Next, the present invention will be explained in full detail with reference to the drawings.

FIG. 4 is a schematic plan view showing the arrangement of the power feeding section. Changing the forming angle (1) Adjust the forming angle θ of the pretreatment rotating frame 4 in accordance with the change in the pipe diameter and plate width. Therefore, it is no longer necessary to independently move and adjust the forming angles of the high-frequency oscillator 15', high-frequency output transformer 15, busper 3.6-1°1G'-1, and contact tip 17.17' that form the power feeding section. Ta.

Figure 5 shows the length from the point 18 where the pipe side edge and strip side edge first meet to the center of the pipe. and the respective lengths from point 18 to the power supply contact tip, ,
There is a schematic side view C showing L2 and the height difference Hk from the strip side edge contact tip to the pipe side edge contact tip. Here is the length from the center of the pipe to point 18. can be calculated from the pipe diameter and plate thickness. In addition, L1 and L2 are desirably equal to L2 in order to maintain an even heating condition of both side edges of the pipe and the strip, and are approximately constant values regardless of the diameter of the vibrator and the thickness of the plate. However, the horizontal length difference l between Ll and L2
is obtained by calculation similar to Lo. Although the relationship between the pipe diameter and Ll is actually a curve, it can be regarded as a straight line for practical purposes.

FIG. 6 shows a mechanism for preventing a discharge state caused by a one-sided contact of the contact tip due to deformation of the pipe side edge and the strip side edge in the board width direction. Shoe holder 38. :Make the entire mounting surface 38' curved and set the contact tips on both sides in advance. Although the figure shows one contact tip on the tube side and one on the strip side, a plurality of contact tips can be provided along the pipe side edge and the strip side edge to improve welding efficiency.

Figures 7.8.9 and 10 show the contact tip positions. , L, , L2. FIG. 6 is a side view, a plan view, and a partially detailed view of a power feeding unit for explaining an adjustment mechanism of H. FIG. High frequency output transformer I5, buspar 16-1.1G'
-1 and the contact tip 17.17' are fully slidable on the sliding base 9 mounted on the pretreatment rotating frame 4'', and the entire power supply group is stripped by the screw 20, female screw 21 and electric motor 22. The direction (- can be moved forward and backward, which changes as the pipe diameter changes.Lo value is changed. Also, the pipe side contact tip 17 and the strip side contact tip 17
The difference in the horizontal position of ' is adjusted by expanding and contracting the piston rod 23-2'e of the cylinder 23-1.

Figure 9 is for pipe side power supply, Figure 10 is for power supply from IJ.

FIG. 6 is a detailed side view showing a contact tip position adjustment mechanism for side power supply.

In FIG. 9, one end of the cylinder 23-1 is fixed to the spar 16-1i, and the piston rod 23-2 is fixed to the female sliding fitting 25 by the pin 24. The movable fitting 25 expands and contracts. In order to prevent uneven contact of the contact tip which changes due to the change in the pipe diameter, the rotational fulcrum position of the contact 7 holder 38 is completely changed. This adjustment is done by driving the electric motor 27 and using the male screw 29.
Rotate and move the female screw 28 to IJJL, link 31,
:33, the rotational fulcrum 34 of the contact shoe holder 38 moves as the bearing:', o, 32k fulcrum. Instead of this, it may be possible to cover the entire circumference of the hydraulic cylinder. 3
9 is a pneumatic cylinder that presses the contact tip 17 onto the spiral tube 2.

FIG. 10 shows the strip of the strip side contact tip and the vertical position adjustment mechanism, and the adjustment operation is the same as that shown in FIG.

Next, an adjustment method for changing the pipe manufacturing size using the apparatus of the present invention will be explained. Changing the pipe diameter or plate thickness C- To set the dimensions from the center of the pipe to the contact tip for the string side wire, calculate the Lo value in °C and match it with the empirical value L2. Set the contact tip for the strip side edge at the +L2 position. In this case, the electric motor 22 is driven to move the series of feeds for the pipe edges and the strip edges from the high-frequency power transformer to the contact tip. The amount of movement is determined by providing, for example, a magnetic scale (not shown) on the sliding portion of the high-frequency output transformer to display the actual amount of movement and the current position of the contact tip on the strip side.

Difference β in the strip advancing direction between the contact tips on both sides of the pipe and the strip that changes due to changes in the pipe diameter
Values are as above. The value is similarly calculated and the piston rod 23-2i of the cylinder 23-1 is expanded and contracted to move the pipe side edge contact tip position back and forth in the direction of the pipe center so that it becomes the β value with respect to the strip side line contact tip position.

To determine the amount of movement in this part, for example, a differential transformer (not shown) or the like is provided between the sliding fittings B and 26 to display the actual amount of movement and the current position. Furthermore, the height difference H' between the contact tip for the strip side edge and the contact tip for the strip side edge that changes due to the change in the pipe diameter is
The rotation fulcrum 34 of is moved. The amount of movement in this part is the same as the l value above. For example, it is possible to display the actual amount of movement and current position by installing a differential transformer (not shown) between the female thread 28 and a part of the sliding fitting 25. Yes, in order to adjust the contact tip position to the deformation of the pipe side edge and strip side edge, loosen the bolt 36-1 or 36'-1'Q, move the contact shoe 36 or 36', and then fix it with the bolt. do.

Press on both side edges by underers 39, 39'.

At present, there is little experience of using electric resistance welding equipment in the spiral pipe manufacturing method, and manufacturing dimensions are limited to small diameter and thin wall C1 fields. Therefore, most of the power supply devices in conventional spiral manufacturing equipment are slightly modified versions of those for straight line welding, and are designed to meet the requirements for contact tips for large diameter and thick plates in non-viral manufacturing equipment. There was nothing. However, in the present invention, the manufacturing dimensions in the spiral manufacturing equipment are limited to a pipe diameter of 500mm to 28"OOrllm.
, plate thickness 6 + nm ~ 30 mm fAssuming tack electric resistance welding or full electric resistance welding, when changing the tube diameter or plate thickness, the position of the contact tip in the forming angle direction, the direction of the protrusion of the l-') The C2 is designed so that the setting can be easily changed to a predetermined position according to the position, vertical position with respect to the strip, and deformation of both side edges of the pipe and strip. As a result, there is no chance of radiation at the contact tip, making stable welding possible.

[Brief explanation of the drawing]

Fig. 1 is a schematic plan view showing the arrangement of the power supply part of a conventional electric resistance welding device in a spiral pipe manufacturing device, and Fig. 2 is a detailed view of the power supply part such as the contact tip, contact shoe, and shoe pedestal in the conventional device. FIG. 3 is a schematic front view showing the contact state of contact chips in the board width direction in a conventional device, FIGS. 4 to 10 are explanatory diagrams of the device according to the present invention, and FIG. Planar schematic diagram,
Fig. 5 is a schematic side view showing the arrangement of contact tips for pipe side edges and strip side edges, and Fig. 6 shows a mechanism for correcting the contact condition of deformed C2 contact tips on both side edges of pipe and strip. The schematic front view, Figures 7 and 8 are a side view and a plan view of the entire series of power supply equipment from the high frequency output transformer to the contact tip, and Figures 9 and 10 are the diagrams for the Jt pipe side edge and FIG. 3 is a partial detailed view of the strip side wire power feeding section. 1...Strip, 1'...Strip with deformed side line, 2...Spiral pipe, 3...Spiral forming machine, 4...Pretreatment turning frame,
5... Delivery rotating frame, 6... Molding rotation center, 15... High frequency output transformer, 15'... High frequency oscillator, 16-1... Pipe side bus bar, 46'
1.Stripe-shaped bus bar, 17.--Pipe 1iil contact tip, 17'--Strip side contact tip, part, 26..Sliding metal fitting, 3.
7.37'...-Contact shoe, 38138'.
・Contact shoe holder. Patent applicant's representative Patent attorney Tomoyuki Yafuki (and 1 other person) Figure 3 Figure 4

Claims (1)

[Claims] S) A power supply unit, a pipe side power supply mechanism, and a strip side power supply mechanism are attached to a strip pretreatment frame whose center of rotation is the point where the left side edge intersects with the center of the pipe in the direction of movement of the IJ knob, The power feeding unit fixed to the IJ tag processing frame is comprised of <1) a medium or high frequency oscillator, (2) a medium or high frequency output transformer, and 3) a plurality of buspars 16-1 and 16'-1, and the pipe The side power supply mechanism includes (4) a sliding metal fitting supported by the buspar 16-1 so as to be movable back and forth (5) one or more contact chips 17 whose upper part has the same curvature as that of the steel pipe (6) (7) One or more contact shoes 37 whose upper part has the same curvature as the lower part of the contact shoe 37 and whose lower part fixes the contact chip 17 and whose lower part has an arbitrary curved surface. A contact shoe pedestal 38 is fixed to the sliding bracket and the contact shoe 37 is attached in a replaceable manner.(8) The upper part is rotatably connected to one end of the contact shoe holder 38, and the lower part is connected to the sliding bracket The upper part of the vertical movement drive source (9) of the fixed contact shoe pedestal is rotatably connected to the other end of the contact shoe pedestal 38,
The lower part is comprised of a tilting drive source for the contact shoe holder rotatably supported by the sliding fitting or the lower end of the vertical drive source, and the strip side power feeding mechanism has (10) an upper part having a half space. fixing the contact chip 17'f on top of one or more contact chips 17'(Jl);
One or more contact shoes 37' (12) whose lower part has an arbitrary curvature surface metal; one part has the same curvature surface metal as the lower part of the contact knee, and the lower part is fixed to the busper 16'-1; The contact shoe 37' is connected to the contact shoe 37' in a replaceable manner, and the other end of the contact shoe holder is fixed to the busbar 16'. Tilting of the contact shoe holder 38', which is rotatably connected to the other end of the shoe holder and whose lower end is rotatably supported by the busper 1.6'-1 or the lower end of the vertical drive source. An electric resistance welding device for spiral steel pipe manufacturing equipment, characterized by comprising a drive source.