KR960001537Y1 - Inner bead eliminating device of a steel pipe by electric welding - Google Patents

Abstract

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Description

Internal bead removal device of electric welded steel pipe

1 is a perspective view schematically showing the overall appearance of the internal bead removing device of the electric welded steel pipe according to the present invention,

2 is a schematic plan view of the inner bead removing device of the electric welding steel pipe according to the present invention.

Figure 3 is a schematic side view of the inner bead removing device of the electric welding steel pipe according to the present invention.

4 is a front schematic view of the internal bead removing device of the electric welding steel pipe according to the present invention,

5 is a view illustrating the operating state of the mandrel (Mandrel) length direction angle adjustment unit of the inner bead removing device of the electric welded steel pipe according to the present invention,

(a) is a front view thereof,

(b) is a side view thereof.

* Explanation of symbols for main parts of the drawings

10: frame 11: steel pipe

20: outer plate 21: tube insertion hole

22: guide home 23: guide rail

30: internal plate 31: block

32: pivot block 33: axis

40: inner plate position adjusting portion 41: transfer support plate

42: drive gear 45: screw jack

50: mandrel circumferential direction control unit 52: worm support plate

60: mandrel holder 70: mandrel length direction angle control unit

The present invention relates to a device for removing internal beads of an electric welded steel pipe used to cut a bead protruding into a tube joint of a welded joint continuously generated in the longitudinal direction of the electric welded steel pipe.

In general, in order to cut and remove the inner bead of the electric welded steel pipe, a trial and error method of setting a height of a cutting bit inserted into a pipe by an approximation is used. Initially, even if the position of the cutting bite is approximated by calculation, the sample at the top of the pipe is taken from the inner bead removing part and the adequacy of the removing condition is checked. After the gas cutting, the height of the cutting bite is manufactured by using a liner or a lower roll bracket under the cutting bite holder. If this adjustment is not repeated several times, satisfactory results cannot be obtained.

In addition, since the cutting bite is gradually worn out during the removal of the bead, the cutting becomes worse, and thus the cutting amount of the bead is reduced. Therefore, the cutting bite must be corrected, and the cutting bite liner is adjusted as described above.

This complicated work is assigned a bead every time according to the inner diameter change (thickness change) of the tube at the same diameter (outer diameter). This is not only economical in terms of time and effort, but also leads to a large loss of raw materials, especially when replacing beads of different diameters (for example from 4 inch to 6 inch). There is a problem that excessive time is consumed because it is necessary to prepare and repeat the above setting.

In addition, since the inner bead is removed while supporting the inner surface of the pipe with the upper roll, the lower bracket, and the lower roll, the upper and lower rolls cause grooves in the inner surface of the pipe and are welded at a temperature of 1400 ° C. or higher. After welding, a spatter is generated, which cools down from the bead to the lower part of the pipe and becomes a spherical bead by surface tension, which is pressed by the lower roll of the bead after welding. There is a problem that it remains in the tube in the shape of a bear beam, and thus becomes a detrimental factor in supplying the supply pipe such as a drawing pipe which considers the inner surface of the pipe.

The present invention is to solve such a conventional problem, the purpose is to eliminate the anxiety of the pressing marks caused by the weld by completely eliminating the upper roll, the lower bracket and the lower roll, the cutting inserted into the steel pipe The circumferential angle and longitudinal angle of the bite tube and the overall position of the mandrel can be adjusted by remote operation from the outside of the tube to obtain a good bead cutting shape and to greatly improve productivity. An object of the present invention is to provide an internal bead removal device for steel welded pipes.

In order to achieve the above object, the present invention is a frame fixed to the front of the pressing roll stand for pressing both edges of the steel pipe, and the external plate is fixed to the vertical perpendicular to the frame and having a tube insertion hole and It is installed by the guide rail to be movable in the outer plate, and provided with a pivot block and a hydraulic cylinder installed so as to be rotatable by a block and a shaft at a predetermined position, the upper and lower positions by a set of internal plate position adjustment unit Mandrel circumferential control unit is installed on the inner plate and the worm support plate fixed to the pivot block provided on the block of the inner plate and can adjust the circumferential angle of the mandrel by driving the handle And, the bottom of the pivot block provided in the block of the inner plate is fastened by a bolt at the bottom A mandrel holder having a dredle fixedly installed, and a mandrel length direction angle control unit installed in a pivot block inside a block provided in the inner plate and operated by a hydraulic cylinder, are provided.

Hereinafter, the present invention by the accompanying drawings will be described in more detail.

1 is a perspective view schematically showing the overall appearance of the internal bead removing apparatus of the electric welding steel tube according to the present invention, Figure 2 is a plan view of the internal bead removing apparatus of the electric welding steel tube according to the present invention, Figure 3 Side view of the inner bead removing device of the electric welded steel pipe according to the present invention, Figure 4 is a front schematic view of the inner bead removing device of the electric welded steel tube according to the present invention, according to the present invention When the overall configuration is divided into large groups, the base 10, the outer plate 20 fixed perpendicular to the base 10, and the inner plate 30 is installed so as to be movable in the outer plate 20 ), A pair of inner plate position adjusting unit 40 for adjusting the up and down position of the inner plate 30, and of the gybot block 32 provided in the block 31 of the inner plate 30 One mandrel circumferential direction adjustment unit 50 and the inside installed on the worm support plate 52 fixed to a predetermined position to adjust the circumferential direction angle of the mandrel 53 by the drive of the handle 58, The mandrel holder 60 which is fastened by a bolt to the lower part of the pivot block 32 provided in the block 31 of the plate 30, and the mandrel 53 is fixed to the bottom, and the inner plate 30. It is set to a predetermined position of the pivot block 32 provided in the block 31 of the mandrel length is shown to be composed of the mandrel length direction angle control unit 70 operated by the hydraulic cylinder (34).

The base 10 is fixedly installed on the front bed of the pressure roll stand (not shown) for pressing both edges of the steel pipe (11).

Meanwhile, as illustrated in FIGS. 2 and 3, a central portion of the outer plate 20 fixed perpendicularly to the base 10 and the inner plate 30 movably installed on the outer plate 20 is provided. Likewise, the pipe insertion hole 21 is provided to allow the steel pipe 11 to pass through, and the open portion passes through the portion where the mandrel 53 and the mandrel holder 60 are connected before the steel pipe 11 is welded. It is designed to have an appropriate thickness, and the inner surface of the side wall of the outer plate 20 shows that the guide groove 22 for guiding the movement in the vertical direction of the inner plate 30 is formed.

On the other hand, the inner plate 30 is installed so as to be movable by the guide rail 23 in the state inserted into the guide groove 22 formed on the outer plate 20, the block 31 is provided at a predetermined position Inside the block 3l, a pivot block 32 is rotatably installed by the shaft 33, and at a predetermined position of the inner plate 30, the mandrel length direction angle adjustment described later is made. A hydraulic cylinder 34 for driving the unit 60 is provided.

On the other hand, the pair of inner plate position adjusting unit 40 for adjusting the vertical position of the inner plate 30 is fixed to both sides of the lower side of the inner plate 30, as shown in FIG. The transfer screw is driven by the transfer support plate 41, the drive gear 42 mounted on both sides of the bottom plate of the outer plate 20, and the turning gear 43 engaged with the drive gear 42. The screw jack 45 which allows the conveying screw 44 to be brought into surface contact with the lower end of the conveying support plate 41 so that the inner plate 30 can be conveyed up and down by transferring the 44 up and down, and the drive gear. The drive shaft 46 and the handle 47 which drive the 42 are shown.

The circumferential angle of the mandrel 53 is installed on the worm support plate 52 fixed by the bolt 51 on the upper part of the pivot block 32 provided in the block 31 of the inner melate 30. Mandrel circumferential direction adjustment unit 50 is adjustable, as shown in Figure 4, the worm support plate 52, l pair of worm drive shaft support fixed to the bottom of the worm support plate 52 54 and the worm drive shaft support 54 is rotatably installed at one end of the 55 (55). And the other end is composed of a worm drive shaft 56 is installed with a worm drive handle 58, and a worm gear 57 is fixed to the mandrel 53 and is fixed by the connecting rod 59 is operated in engagement with the worm 55. do.

As shown in FIG. 2, the lower end of the mandrel holder 60 fixed by the bolt 61 to the lower part of the pivot block 32 provided in the block 31 of the inner plate 30, The mandrel connecting rod 66 into which the mandrel 53 is fitted is fixed to the bolt 61, and the worm gear 57 is welded to the end of the mandrel 53 by the connecting rod 59.

Thus, the mandrel 53 is configured to be able to rotate in the circumferential direction in the mandrel connecting rod 66, the mandrel 53 can be rotated by the rotation of the worm gear 57, the mandrel 53 At one end, a normal cutting bite 62 is fixedly fixed by a bite fixing bolt 63, and a cooling line 65 for cooling the cutting bite 62 and the core 64 is provided.

The mandrel length direction angle adjustment unit 70 installed inside the pivot block 32 rotatably installed by the shaft 33 on the block 31 of the inner plate 30 is shown in FIG. ) And (B), the pivot 32 which is rotatably installed by the shaft 33 of the block 31 of the inner plate 30, and the inside of the pivot block 32; And a cam 72 driven by the drive of the funcim camshaft 71 and installed in front of the pivot block 32 to prevent the cap 72 from being separated from the pivot block 32. A cam cover 73 and a hydraulic cylinder 34 connected to the knuckle joint 74 and the lever 75 at one end of the cam shaft 71 so as to drive the cam shaft 71.

Referring to the action and effect of the inner bead removal device of the electric welding steel pipe according to the present invention configured as described above are as follows.

First, the circumferential direction adjustment of the mandrel 53 is adjusted by the worm 55 on the mandrel circumferential direction adjusting unit 50, as shown in FIG. 4, by turning the worm drive handle 58, the worm The drive shaft 56 and the worm 55 are rotated and the worm gear 57 meshed with the worm 55 is rotated in the circumferential direction. Thus, the worm gear 57 is connected to one end of the mandrel 53 by the connecting rod 59. The mandrel 53 is welded, and the mandrel 53 is fitted to the mandrel connecting rod 66 fixed to the mandrel holder 60. As a result of the rotation of the worm gear 57, the mandrel 53 is the mandrel connecting rod 66. Since the inside is rotated, the circumferential direction of the cutting bite 62 fixed to one end of the mandrel 53 can be adjusted.

Next, the inner plate position adjusting portion 40 to adjust the overall upper and lower positions of the mandrel 53 is used to adjust the gap between the cutting bite 62 and the inner surface of the steel pipe 11, the operation thereof It is adjusted by the driving of the screw jack 45 composed of the drive gear 42 and the turning gear 43 and the transfer screw 44 meshed with it.

As shown in FIG. 4, when the driving shaft 46 is rotated by the rotation of the handle 47, the driving gear 42 of the screw jack 45 fixed thereto is rotated. As the drive gear 42 is rotated, the turning gear 43 engaged with the driving gear 42 is rotated to raise or lower the feed screw 44 screwed to the turning gear 43. The upper end of the transfer screw 44 is in surface contact with the lower end of the transfer support plate 41 is fixed to the inner plate 30 to raise or lower the entire inner plate 30, the inner plate 30 Since the pivot block 32 and the mandrel holder 60 and the mandrel 53 coupled thereto are lifted or lowered by the lifting or lowering operation, the cutting bit 62 can be adjusted up and down.

And, the mandrel length direction adjustment unit 70 gives a cutting force to the cutting bite 62 when removing the internal bead so as to smoothly remove the bead, while applying pressure to absorb the minute vibration that may occur during cutting the skelp And the welding protrusion that occurs when welding the skelp and the material is used to adjust the position of the mandrel so that the defective skelp does not contact the cutting bite when the material is replaced, the hydraulic cylinder 34 is fixed to the inner plate (30) It is driven by the camshaft 71 and the cam 72 connected thereto.

When the hydraulic cylinder 34 is operated by operation of a control panel switch (not shown), as shown in FIG. 5B, the cam shaft 72 fitted to the cam 72 on the pivot block 32 is engaged. The vertical movement of the hydraulic cylinder 34 is converted into a rotational motion by the connection of the nucol joint 74 and the lever 75, and the rotation of the eccentric camshaft 71 cams the shaft 33 to the point by the eccentricity. Will turn 72. As such, when the cam 72 is pivoted, the pivot block 32 on which the cam 72 is installed is also pivoted, and the mandrel holder 60 and the mandrel 53 fixed thereto are pivoted as the pivot block 32 is pivoted. This also turns.

Therefore, since the cutting bite 62 in which the mandrel 53 is fixed to one end by turning the mandrel 53 is also turned, adjustment of the contact angle between the inner surface of the steel pipe 11 and the cutting bite 62 is difficult. It becomes possible.

As described above, the cutting device for the inner bead of the electric welded steel pipe according to the present invention can adjust the mandrel 53 in the circumferential direction, the longitudinal direction, and the vertical direction, so that the cutting position is adjusted from the outside by operating the handle or the control panel switch. By the operation of the hydraulic cylinder 34 can be made very simple.

In addition, since the base serves as a support used in the conventional mandrel, the mandrel support distance is reduced to about 1/4, so that the attachment of the upper and lower rolls of the mandrel used in the past is unnecessary. This completely eliminates the crushing of the inner surface of the pipe by the internal weld, and the mandrel was replaced by one mandrel every time the size of the steel pipe was replaced, thereby reducing the time required to replace the mandrel and the upper and lower rolls. It will be brought, and the use of the lower roll, lower roll bracket, roll bearing, the upper roll, such as the use of the parts, such as failure and impairment caused by the damage and replacement of the parts are removed.

By adjusting the bite position by bite wear, etc., a trial and error method is used.However, the number of times of checking the cutting position has been standardized by attaching a scale to the outside of the handle by the operator's sense. It has a great effect on the reduction, product defect, and reduction of downtime.

Claims (4)

A base 10 fixedly installed in front of the pressure roll stand for pressing both edges of the steel pipe 11; An outer plate 20 fixed perpendicularly to the frame 10 and having a tube insertion hole 21 and: The pivot plate 32 and the hydraulic cylinder 34 are installed on the outer plate 20 by the guide rail 23 so as to be movable, and rotatable by the block 31 and the shaft 33 at a predetermined position. And an inner plate 30 capable of adjusting the vertical position by a pair of inner plate position adjusting units 40; A mandrel holder 60 in which a mandrel 53 is fixed to a lower end of the pivot block 32 provided in the block 31 of the inner plate 30 by a bolt; Electrical welding, characterized in that the mandrel length direction angle control unit 70 is installed on the pivot block 32 inside the block 31 provided in the inner plate 30 and is operated by the hydraulic cylinder 34. Internal bead removal device of steel pipe. According to claim 1, wherein the pair of inner plate position adjusting section 40 and the transfer support plate 41 is fixed to the lower both sides of the inner plate (30); Drive gears 42 provided on both sides of the bottom plate of the outer plate 20; By transferring the transfer screw 44 up and down by driving the turning gear 43 engaged with the drive gear 42, the transfer screw 44 is brought into surface contact with the lower end of the transfer support plate 41 to form an inner plate. A screw jack (45) for conveying (30) up and down; Internal bead removal device of the electric welded steel pipe, characterized in that consisting of a drive shaft 46 and a handle 47 for driving the drive gear (42). According to claim 1, wherein the mandrel circumferential direction adjusting section 50 and the worm support plate (52); A pair of worm drive shaft supports 54 fixedly installed on the bottom of the worm support plate 52; A worm drive shaft 56 installed rotatably on the worm drive shaft support 54, at one end of which a worm 55 is formed, and at the other end thereof, a worm drive handle 58; The inner bead removing device of the electric welded steel pipe, characterized in that consisting of a worm gear (57) that is engaged with the worm (55) and fixed to the mandrel (53) by a connecting rod (59). According to claim 1, wherein the mandrel length direction angle control unit 70 is pivot block 32 which is rotatably mounted on the block 31 of the inner plate (30) by the shaft (33); A cam 72 installed in the pivot block 32 and eccentrically driven by the camshaft 71; A cam cover (73) installed at the front of the pivot (32) to prevent the cam (72) from being separated from the pivot block (32); An inner bead removing device of an electric welded steel pipe, characterized in that the hydraulic cylinder (34) connected to the knuckle joint (74) and the lever (75) at one end of the cam shaft (71) to drive the cam shaft (71).