JP7091719B2 - Magnet roll type transfer device - Google Patents

Description

The present invention relates to a magnet roll type transport device for adhering a steel pipe pulled up from a plating bath by the magnetic force of a rotating magnet roll and transporting the steel pipe in the direction of the pipe axis.

In the manufacture of steel pipes plated with metal (Zn, Sn, Al, etc.), the steel pipes that have been pickled and flux-treated to remove rust and the like are usually immersed in a plating bath. The plated steel pipe is pulled up from the plating bath, adhered by the magnetic force of a plurality of magnet rolls, and is advanced in the direction of the pipe axis by the rotation of the magnet rolls in a suspended state, and is conveyed to the next process.

During this transfer, the zinc on the surface of the steel pipe that has just been pulled up from the plating bath, for example the galvanizing bath, is still in a molten state. Therefore, if a part of the molten zinc adheres to the magnet roll and then solidifies, the solidified zinc attached to the magnet roll may reattach (transfer) to the steel pipe when the magnet roll goes around.

When the zinc solidified in this way reattaches to the steel pipe, an appearance defect called so-called outer surface sagging occurs in the reattached portion of the steel pipe. Not only does such outer surface sagging look bad, but when the steel pipe is secondarily processed, processing defects (defects) are likely to occur at the portion where the outer surface sagging occurs.

The occurrence of such outer surface sagging is also due to the fact that the amount of molten metal adhering to the surface of the steel pipe that has just been pulled up from the plating bath is larger than the appropriate amount. By wiping (plating) the steel pipe pulled up from the bath, the amount of molten metal adhering to the surface of the steel pipe is suppressed to an appropriate amount (see, for example, Patent Document 1 and Patent Document 2).

Japanese Unexamined Patent Publication No. 61-22173 Jitsukaihei No. 2-82765

However, if the amount of molten metal adhering to the surface of the steel pipe is suppressed to an appropriate amount by wiping or the like, a part of the molten metal adheres to the magnet roll and the solidified metal reattaches from the magnet roll to the steel pipe. The current situation is that (transfer) cannot be completely prevented.

The present invention has been made in view of the above circumstances, and provides a magnet roll type transport device capable of preventing molten metal adhering to a magnet roll from the surface of a steel pipe from solidifying and reattaching (transferring) to the steel pipe. The purpose.

In order to achieve the above object, the present invention is a magnet roll type transport device for adhering a steel pipe pulled up from a plating bath to a rotating magnet roll and transporting it in the direction of the tube axis, along the shape of the magnet roll. It is characterized by having a scraper that rubs the surface of the magnet roll.

In the present invention, since the scraper for rubbing the surface of the magnet roll is provided along the shape of the magnet roll, the molten metal is partially peeled off from the surface of the steel tube pulled up from the plating bath to the magnet roll and adheres to the magnet roll. Even if this is the case, the adhered molten metal is actively scraped off from the surface of the magnet roll by a scraper that rubs the surface of the magnet roll as the magnet roll rotates, including the subsequent solidification state. It is removed and prevented from reattaching (transferring) from the magnet roll to the steel tube. Therefore, it is possible to prevent the outer surface of the steel pipe from sagging (poor appearance).

Further, in the present invention, the scraper rubs the surface of the magnet roll along the shape of the magnet roll (hence, has a shape corresponding to the surface shape of the magnet roll, for example), so that the molten metal adhering to the surface of the magnet roll is formed. (Consolidated metal) can be removed evenly, and metal reattachment from the magnet roll to the steel pipe can be reliably prevented.

Further, in the above configuration of the present invention, it is preferable that the scraper is urged movably in the substantially radial direction of the magnet roll by the urging means and pressed against the surface of the magnet roll. According to such a configuration, a certain degree of adhesion is ensured between the magnet roll and the scraper by the urging force by the urging means (the scraper can be pressed against the magnet roll with a constant pressure), and the scraper. The desired scraping performance can be obtained, and when the steel pipe collides with the magnet roll with a large impact force and the magnet roll and the scraper collide, or the solidified metal adhering to the magnet roll is largely solidified. When a large load acts on the scraper, such as when the impact of scraping the metal with the scraper is large, the scraper can move so as to escape substantially radially outward against the urging force of the urging means. It is possible to prevent the scraper from being damaged due to the impact. That is, in the above configuration of the present invention, the urging means functions as a suspension capable of releasing the impact force acting on the scraper.

The urging means urges the scraper to move in the substantially radial direction of the magnet roll, such as a spring (for example, a compression coil spring) or a fluid pressure (hydraulic pressure, pneumatic pressure, etc.) operating mechanism, and presses the scraper against the surface of the magnet roll. It may be in any form as long as it can be used. Further, in this case, it is preferable to provide an adjusting mechanism capable of adjusting the urging force. Further, the scraper may be applied to the magnet roll in its radial direction, or may be applied to the magnet roll at an oblique angle with respect to the radial direction.

Further, in the above configuration of the present invention, it is preferable that the magnet roll has a plurality of concave grooves, each of which can hold a steel pipe. According to such a configuration, a plurality of steel pipes can be pulled up from the plating bath at once by the magnet roll, held in each concave groove, and conveyed, and the plating processing capacity is improved. Further, in this case, it is preferable to provide a scraper in each concave groove. If a scraper is provided independently in each of the plurality of recesses in this way, the surface of the magnet roll may or may not be used (whether or not a steel pipe is attached to the magnet roll). The solidified metal adhering to the surface can be scraped off by scraping with a scraper.

According to the magnet roll type transport device of the present invention, since the scraper for rubbing the surface of the magnet roll is provided along the shape of the magnet roll, the molten metal adhering to the magnet roll is solidified from the surface of the steel pipe to the steel pipe. It can be prevented from adhering to the magnet again. That is, since unnecessary solidified metal is removed from the magnet roll by the scraper in advance, even if the molten metal adheres to the magnet roll from the surface of the steel pipe, reattachment (transfer) from the magnet roll to the steel pipe is prevented. It is possible to prevent the outer surface of the steel pipe from sagging (poor appearance).

It is a schematic diagram which shows the state which pulls up and conveys a steel pipe from a plating bath by the magnet roll type transfer apparatus which concerns on one Embodiment of this invention. It is sectional drawing which shows the schematic structure of the scraper apparatus provided in the magnet roll type transfer apparatus of FIG. It is a schematic diagram which shows the contact state of each scraper of a scraper device with respect to a magnet roll. It is a schematic plan view of the scraper device of FIG.

Hereinafter, an embodiment of the magnet roll type transport device according to the present invention will be described with reference to the drawings.
FIG. 1 schematically shows a state in which a steel pipe 10 is pulled up from a plating bath (plating bath) 70 and transported by a magnet roll type transport device 1 according to an embodiment of the present invention. As shown in the figure, the steel tube 10 immersed and plated in the molten metal (for example, molten zinc in the present embodiment) 72 of the plating bath 70 is, for example, in the magnet roll type transport device 1 in an inclined posture as shown in the figure. The magnetic force possessed by each magnet roll 2, 4, 6 pulls it up from the plating bath 70 and sequentially adheres to the magnet rolls 2, 4, 6, and the rotating magnet rolls 2, 4, 6 cooperate with the guide roll 50. It is conveyed in the pipe axis direction (longitudinal axis direction of the steel pipe 10) by the action.

The magnet roll type transfer device 1 is a scraper device 20 provided corresponding to each of the triple magnet roll arrangement A and the magnet rolls 2, 4 and 6 of the magnet roll arrangement A (three scrapers in the present embodiment). It has a device 20) and.

In the triple magnet roll arrangement A, the first magnet roll 2, the second magnet roll 4, and the third magnet roll 6 are arranged in this order in parallel from the plating bath 3 side in the tube axis direction. It consists of. In particular, in the present embodiment, for example, the first and second magnet rolls 2 and 4 on the upstream side of the transport are set to have substantially the same outer diameter, and the third magnet roll 6 on the downstream side is the first and second magnet rolls. The outer diameter is set to be larger than the outer diameter of the magnet rolls 2 and 4.

As shown in FIG. 4, each of the magnet rolls 2, 4, and 6 has its rotating shafts 2a, 4a, and 6a rotatably supported by a housing (mounting frame) 30 via a bearing 26. Further, each of the magnet rolls 2, 4, and 6 has a plurality of (four in the present embodiment) concave grooves 11 formed on the outer peripheral surface thereof at equal intervals along the axial direction of the magnet roll. In particular, in the present embodiment, the groove 11 is V-shaped so that the steel pipe 10 having any outer diameter can fit into the groove 11, and is shown in FIG. 3 when viewed from the front. The steel pipe 10 is in contact with the steel pipe 10 at two points P and Q so that the steel pipe 10 can be held by a magnetic force.

A plurality of scraper devices 20 provided corresponding to the magnet rolls 2, 4 and 6 corresponding to the concave grooves 11 of the corresponding magnet rolls 2, 4 and 6 (four in the present embodiment). ) It has a scraper main body (scraper) 22 provided, and a plurality of (four in the present embodiment) urging mechanisms (bulging means) 25 provided corresponding to each scraper main body 22.

Each scraper main body 22 has substantially the same shape as the concave grooves 11 of the magnet rolls 2, 4, and 6 (substantially V (wedge) shape in the present embodiment) and fits (meshes) with the concave grooves 11. It has an acting portion 22a and a shaft portion 22b extending in the radial direction of the magnet rolls 2, 4, 6 from the acting portion 22, and the magnet rolls 2, 4, 6 are rotated as the magnet rolls 2, 4, 6 rotate. By rubbing the surface with the acting portion 22a so as to follow the outer surface shape, the metal adhering to the outer surface of the magnet rolls 2, 4 and 6 can be scraped off.

Further, each urging mechanism 25 provided corresponding to each scraper main body 22 urges the scraper main body 22 so as to be movable in the substantially radial direction of the magnet rolls 2, 4, and 6, and the magnet rolls 2, 4, and 6. (In this embodiment, the working portion 22a is pressed against the concave groove 11). Specifically, the urging mechanism 25 abuts the contact portion 23 which is in contact with the end surface 22ba of the shaft portion 22b of the scraper main body 22 and is movable in the radial direction of the magnet rolls 2, 4 and 6, and the contact portion 23. A spring of any form that urges the scraper body 22 (presses the contact portion 23 against the end surface 22ba of the shaft portion 22b with a predetermined pressure) (in this embodiment, the spring is held in a wound state around the support shaft). It has a compression coil spring) 29. Further, the urging mechanism 25 also has an adjusting unit 27 for adjusting the urging force by changing the compression amount of the spring 29. The adjusting unit 27 may be capable of adjusting the compression amount (urging force) of the spring 29, for example, by the screwed state of the bolt and the nut. In this embodiment, the pressing pressure by the spring 29 can be adjusted within a predetermined pressure range (for example, 2 kgf to 2.5 kgf).

Further, the scraper main body 22 is supported in the rotational direction of the magnet rolls 2, 4, and 6 by a pair of support plates 32, 32 which are positioned so as to sandwich the scraper main body 22 from both sides in the thickness direction and are fixed to the housing 30. At the same time, the radial movement is guided.

The metal on the magnet rolls 2, 4, and 6 scraped off by the scraper main body 22 may be naturally dropped below the housing 30, or may be blown off by blowing air.

As described above, the magnet roll type transport device 1 of the present embodiment has a scraper body (scraper) 22 that rubs the surface of the magnet rolls 2, 4, 6 along the shapes of the magnet rolls 2, 4, and 6. In order to prepare for this, even if the molten metal 72 is partially peeled off from the surface of the steel tube 10 pulled up from the plating bath 70 to the magnet rolls 2, 4, and 6, the adhered molten metal is subsequently attached. The surface of the magnet rolls 2, 4, 6 is actively scraped off by the scraper body 22 that rubs the surface of the magnet rolls 2, 4, 6 as the magnet rolls 2, 4, 6 rotate, including the solidified state. It is removed from the magnet rolls 2, 4 and 6 to prevent reattachment (transfer) to the steel tube 10. Therefore, it is possible to prevent the outer surface of the steel pipe 10 from sagging (poor appearance).

Further, in the present embodiment, the scraper main body 22 has a magnet roll in which the acting portion 22a has a shape substantially similar to that of the concave grooves 11 of the magnet rolls 2, 4 and 6 and is fitted with the concave grooves 11. In order to rub the surface of the magnet rolls 2, 4 and 6 along the shape of the magnet rolls 2, 4 and 6, the molten metal (solidified metal) adhering to the surface of the magnet rolls 2, 4 and 6 is evenly removed. Metal reattachment from the magnet rolls 2, 4 and 6 to the steel pipe 10 can be reliably prevented.

Further, in the present embodiment, the scraper main body 22 is urged by the urging mechanism 25 so as to be movable in the substantially radial direction of the magnet rolls 2, 4, and 6, and is pressed against the surfaces of the magnet rolls 2, 4, and 6. , The urging force of the urging mechanism 25 ensures a certain degree of adhesion between the magnet rolls 2, 4, and 6 and the scraper body 22 (the scraper body 22 is pressed against the magnet rolls 2, 4, and 6 at a constant pressure. (Can be pressed), the desired scraping performance of the scraper body 22 can be obtained, and the steel pipe 10 collides with the magnet rolls 2, 4, and 6 with a large impact force, and the magnet rolls 2, 4 , 6 collides with the scraper body 22, or the solidified metal adhering to the magnet rolls 2, 4 and 6 is large and the impact when scraping the solidified metal with the scraper body 22 is large, a large load is applied to the scraper body 22. When is acting, the scraper main body 22 can move so as to escape substantially radially outward against the urging force of the urging mechanism 25, so that the scraper main body 22 can be prevented from being damaged due to the above-mentioned impact. That is, in the present embodiment, the urging mechanism 25 can function as a suspension capable of releasing the impact force acting on the scraper main body 22.

Further, in the present embodiment, since the magnet rolls 2, 4 and 6 have a plurality of concave grooves 11 each of which can hold the steel pipe 10, a plurality of steel pipes 10 are plated from the plating bath 70 by the magnet rolls 2, 4 and 6. It can be pulled up at once, held in each concave groove 11 and conveyed, and the plating processing capacity is improved. Further, in the present embodiment, since the scraper main body 22 is independently provided in each concave groove 11, the steel pipe 10 is attached to the magnet rolls 2, 4, and 6 regardless of whether or not the magnet rolls 2, 4, and 6 are used. The solidified metal adhering to the surfaces of the magnet rolls 2, 4 and 6 can be scraped off by the scraper body 22 (whether or not they are adhered).

The present inventors have already confirmed by experiments the excellent action and effect of such a scraper device 20. That is, as a preliminary experiment, the present inventors connect a scraper main body 22 having an acting portion 22a having the same shape as the groove 11 to one groove 11 of the third magnet roll 6 to manufacture a steel pipe 10. As a result, it was found that the solidified zinc could be peeled off from the magnet roll 6 due to the presence of the scraper main body 22. However, since the scraper main body 22 is simply arranged via the housing 30, the scraper main body 22 is tilted every time the solidified zinc collides with the scraper main body 22 (every time the solidified zinc is peeled off), and the magnet roll 6 is tilted. If the gap between the scraper body 22 and the scraper body 22 becomes large or the scraper body 22 is destroyed and the scraper body 22 is manufactured for a while, the peeling effect of the solidified zinc by the scraper body 22 decreases and the occurrence of outer surface sagging increases. did.

Therefore, in order to cushion the collision between the solidified zinc and the scraper main body 22, a spring 29 is arranged in the housing 30, and the scraper main body 22 is connected to the magnet roll 6 via the spring 29. With such a configuration, the scraper main body 22 is pressurized and the gap between the scraper main body 22 and the magnet roll 6 is kept constant, while the solidified zinc is used as the scraper main body even when a large solidified zinc collides with the scraper main body 22. It can be eliminated by 22 and the collision force is relaxed by the spring 29, so that the scraper body 22 itself is not destroyed.

From the above results, when the scraper main body 22 was arranged in all the concave grooves of the magnet roll via the spring 29 to manufacture the plated steel pipe, the carbon steel pipe for piping (SGP pipe) with the largest production volume was manufactured. The outer surface sagging rate before the scraper body 22 was placed was 0.77% (recent average before mounting), while the outer surface sagging rate after the scraper body 22 was placed was 0.58% (after mounting). Monthly average) decreased. Looking at the steel pipe as a whole, the rate of occurrence of sagging on the outer surface decreased by 0.19%, but the fact that the defective product on the outer surface sagging decreased by 24.7% by arranging the scraper main body 22 of the present invention was significant in manufacturing.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment and can be variously modified and implemented without departing from the gist thereof. For example, in the above-described embodiment, the shape of the concave groove of the magnet roll is V-shaped, but the shape of the concave groove is not limited to this and can be set arbitrarily. Further, in the above-described embodiment, the urging mechanism 25 causes the urging straight by the spring 29, but the urging mechanism (the urging means) is not limited to the spring but is urged by the fluid pressure (hydraulic pressure, pneumatic pressure, etc.). Any mechanism can be adopted, such as creating a force. Further, the number of magnet rolls and the number of concave grooves of the magnet rolls are not limited to those of the above-described embodiment, and can be arbitrarily set. In addition, in order to reduce the transfer of molten metal from the surface of the steel pipe to the magnet roll as much as possible, the amount of molten metal adhering to the surface of the steel pipe is suppressed to an appropriate amount by wiping (squeezing) the steel pipe pulled up from the plating bath. Any type of wiping device may be provided at the same time.

1 Magnet roll type transport device 2, 4, 6 Magnet roll 10 Steel pipe 11 Concave groove 20 Scraper device 22 Scraper body (scraper)
25 Biasing mechanism (Bending means)

Claims (4)

In a magnet roll type transport device for attaching a steel pipe that has just been pulled up from a plating bath to a rotating magnet roll and transporting it in the suspended state in the direction of the pipe axis.
With or without the use of the magnet roll
A magnet roll type transport device having a scraper that rubs the surface of the magnet roll along the shape of the magnet roll. The magnet roll type transport device according to claim 1, wherein the scraper is urged movably in a substantially radial direction of the magnet roll by an urging means and pressed against the surface of the magnet roll. The magnet roll type transport device according to claim 1 or 2, wherein the magnet roll has a plurality of concave grooves, each of which can hold a steel pipe. The magnet roll type transfer device according to claim 3, wherein the scraper is provided in each of the concave grooves.

Images