JP2007007687A - Device for removing bead chip on inner surface of pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for removing bead chips without lowering productivity. <P>SOLUTION: A device for removing bead chips on the inner surface of a pipe is arranged on a cooling bed, where a manufactured steel pipe is gradually fed in a traverse direction and cooled. The device comprises a header for blowing the inner surface of a pipe, a pipe clamp unit, a blow receiving stand, and a walking arm having a pipe receiving stand at its front end, on which a plurality of steel pipes are laid. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a pipe inner surface blowing device for extracting pipe inner surface bead waste in a cooling bed.

  Generally, as shown in FIG. 5, an electric resistance welded steel pipe is manufactured by forming a hot rolled coil (3) with an electric resistance welder forming machine (4) and cutting it into a predetermined dimension with a cutting machine (5). . On the other hand, the inner surface bead is cut with a bead cutter when forming the ERW pipe, and the bead scrap (8) is conveyed with the steel pipe while remaining on the inner surface of the pipe, and is blown from the end of the pipe on the intermediate table (6) by the blower (7). Blowed away.

  In recent years, after pipe making with an electric sewing machine (4), it is heated with a high-frequency heating device (10), and products with various steel pipe diameters are produced using a reduced diameter rolling mill (hereinafter referred to as reducer (11)). It has become like this. In this case, since the steel pipe is cut to a predetermined dimension before the reducer (11) is inserted, a loss occurs at the front and rear ends of the steel pipe when the diameter is reduced by hot rolling, resulting in a decrease in product yield. was there. Moreover, since the steel pipe was stopped on the intermediate table (6) and the bead waste (8) was removed by the blow (7) process, the batch process was performed, and the productivity of the reducer (11) was affected.

  In order to prevent the above-described decrease in productivity and decrease in yield, the steel pipe formed by the electric resistance welder forming machine (4) is used for the intermediate table (6) without cutting the product by the cutting machine (5). The steel pipe is heated to a predetermined temperature with a high-frequency heating device (10), inserted into the reducer (11), continuously reduced in diameter, and transferred to the cooling bed (13). In addition, it is conceivable to cut the product with a hot saw (12). In this case, the problem is where to remove the bead waste (8) remaining on the inner surface of the pipe.

To solve the above problem,
(A) Although it can be considered to be removed in the cooling bed (13), the cooling bed (13) adopts a rotary transverse feed system using a screw shaft from the viewpoint of preventing the bending of the steel pipe during cooling. Since it is moving laterally while rotating, it is difficult to reliably remove the bead waste (8) while moving the steel pipe. In addition, stopping the lateral movement of the steel pipe and removing the bead waste (8) may cause problems such as stopping the reducer (11) or stopping the electric sewing machine (4) depending on the stop time. Comes out.

As another method, (b) a buffer table is provided after the cooling bed (13) outlet, the steel pipe is stopped on the table, and the bead waste (8) is removed by blowing or the like. In the case of this method, the steel pipe is transported with the bead waste (8) remaining on the inner surface, so the bead waste (8) falls during the transport from the cooling bed (13) outlet to the buffer table, and the transport line. However, there is a risk of problems such as stopping.

  The problem to be solved is whether there is a method and equipment for removing the bead waste (8) without reducing the productivity.

The inventors of the present invention have made the present invention by intensively studying the above problems.
The present invention adopts the following configuration in order to solve the problem.

The first invention is provided on a cooling bed where a steel pipe after pipe making is gradually laterally fed and cooled, and is loaded with a pipe inner surface blow header, a pipe clamp device, a blow cradle, and a plurality of steel pipes. It is a pipe inner surface bead waste removal device comprising a walking arm having a pipe cradle at the tip.
According to a second aspect of the present invention, the walking arm is composed of an arm that carries a pipe from above the cooling bed to a blow cradle of a blow device, and an arm that lowers the pipe onto the cooling bed. It is a pipe | tube inner surface bead waste removal apparatus as described in this invention.

  A third invention is the first invention or the second invention, wherein the walking arm is retracted under the floor of the cooling bed when the bead waste removal operation is not performed. It is a pipe inner surface bead waste removal apparatus.

  According to a fourth aspect of the invention, the pipe inner surface bead scraps according to any one of the first to third aspects are characterized in that the blow of the pipe inner surface is performed by water blow or mixed blow of water and air. It is a removal device.

The fifth aspect of the invention is that an electric resistance welded steel pipe continuously formed by an electric resistance pipe forming mill, an inner surface bead cutting device, a high frequency heating device, and a reducer is cut into a predetermined length by a hot saw, and then conveyed to a cooling bed and cooled. A method for producing an ERW steel pipe, characterized in that residual bead waste is removed by a pipe inner surface bead waste removal device installed on a bed.

  The inner surface bead debris removal device of the present invention can reliably remove the inner bead debris on the cooling bed, so that continuous hot reduction rolling can be performed while the inner bead debris remains in the steel pipe, and productivity and yield are improved. Can be improved.

The best mode for carrying out the present invention will be described with reference to FIGS. 1, 2, and 3. FIG.
FIG. 1 is an overall view showing a line arrangement for performing continuous pipe making of ERW steel pipe and continuous diameter reduction rolling.
The uncoiled hot-rolled steel sheet (3) is electro-welded to a predetermined size by an electric-welded pipe forming mill (4), and the pipe inner surface bead of the electric-sewn portion is cut by a bead cutting machine. The cut bead scrap is continuous, remains on the inner surface of the pipe, and is carried to the next process as the steel pipe is conveyed.

Next, the formed steel pipe is conveyed to a high-frequency induction heating device (10) and a reducer (11) line through an intermediate table (6). Here, the intermediate table is a table for temporarily placing a steel pipe cut to a predetermined size by a cutting machine (5) when performing diameter reduction rolling in a batch. In the continuous diameter reduction rolling of the present invention, the intermediate table is not essential. Absent. Therefore, the ERW pipe forming machine (4) line, the high frequency induction heating device (10), and the reducer (11) line may be directly connected.
After completion of the diameter reduction rolling, the steel pipe is cut into a predetermined size with a hot saw (12). Here, the bead waste is also cut simultaneously with the cutting of the steel pipe, and remains on the inner surface of each steel pipe. And the steel pipe (9) which incorporated the bead waste is conveyed to a cooling bed (13).

  As shown in FIG. 4, the cooling bed (13) is a screw type cooling bed (41). As the screw rotates, the steel pipe is pushed by the fins (42) and rotates toward the outlet of the cooling bed. Are gradually traversed and cooled.

The pipe inner surface bead removing device is located at the rear stage of the cooling bed (13) in the overall layout diagram of FIG. 1, and the blower (7) blows the inner surface of the steel pipe to discharge the bead waste (8). A more detailed structure of this apparatus is shown in FIGS.
FIG. 2 is a cross-sectional view of the pipe inner surface bead removing device. FIG. 3 is a plan view of the pipe inner surface bead removing device.

A plurality of steel pipes (six in FIG. 2) which have been laterally fed on the screw type cooling bed (35) are pipe cradles attached to the tip of the walking arm (27) before the blow device (21). It is lifted from above the screw type cooling bed (35) by (26), rotates clockwise, and is arranged on the blow cradle (23) of the blow device (21). A plurality of gears are attached to the walking arm (27), and these gears rotate as the arm is raised and lowered, and a pipe cradle attached to the tip of the walking arm (27). (26) is controlled in posture so as to be parallel to the screw-type cooling bed (35), so that a plurality of pipes are lifted from the cooling bed and placed on the blow cradle (23) of the blow device (21). The work of arranging is performed smoothly.
The pipe (36) placed on the blow cradle (23) of the blow device (21) is fixed by a pipe clamp (22, 32). The inner surface of the tube is then blown with water or a mixture of water and air, and the bead waste is removed from the steel tube.

  The six pipes that have finished blowing are released from being fixed by the pipe clamps (22, 32), and are attached to the tip of a walking arm (27) waiting on the downstream side of the blowing device (21) ( 26) is lifted from the blow cradle (23) by 26), rotated clockwise, and arranged on the cooling bed (35) on the downstream side of the blow device (21). The pipe is further pushed downstream of the cooling bed while being pushed by the fins by the rotation of the screw.

Next, looking at the time cycle of the blow work,
One cycle of the blow work is 11 seconds, that is, walking arm movement 2 seconds + pipe clamp 1 second + blow 5 seconds + pipe unclamp 1 second + walking arm movement 2 seconds. In this time cycle of one cycle, the blow work is performed in parallel with the pipes, so that the number of pipes lifted by the walking arm is not greatly changed regardless of whether the number is six or eight. On the other hand, the moving speed of the pipe on the screw-type cooling bed is 2 seconds / pipe, and when the blow work is 6 pieces, the moving time of the pipe is 2 seconds / line x 6 pieces = 12 seconds, Similarly, it becomes 16 seconds. Accordingly, since one cycle of the blow work is 11 seconds, the waiting time for moving the pipe in the blow work is 1 to 5 seconds, and there is no traffic jam of the pipe on the cooling bed due to the blow work.
As described above, the time cycle of the blow work according to the present invention is shorter than the time required for 6 to 8 pipes to move on the screw shaft, so that the screw-type cooling bed is stopped by performing the blow work. In addition, the reducer (11) and the molding machine (4) are not stopped.

When the blow work is completed, the walking arm (33) and the blow cradle (34) shown in the plan view of FIG. 3 can stand by under the floor of the screw type cooling bed (35). Can also be used as
Of course, as described above, the combined use of the screw-type cooling bed (35) and the blow device (21) is still the point of the present invention.

  According to the equipment and method of the present invention, since the cooling bed can be used for multiple purposes, it can be applied to the field where the cooling bed becomes a neck process.

It is a figure explaining the whole arrangement | positioning of the installation of the electric sewing pipe manufacturing line of this invention. It is sectional drawing of a pipe inner surface bead removal apparatus. It is a top view of a pipe inner surface bead removal device. It is a figure explaining a screw type cooling bed. It is a figure explaining the equipment arrangement | positioning of the conventional ERW pipe manufacturing line.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Uncoiler 2 Looper 3 Hot-rolled coil 4 ERW pipe forming mill 5 Cutting machine 6 Intermediate table 7 Bead waste blower 8 Bead waste 9 ERW steel pipe (product)
DESCRIPTION OF SYMBOLS 10 High frequency induction heating apparatus 11 Reducer 12 Hot saw 13 Cooling bed 21 Blow apparatus 22 Pipe clamp 23 Blow receiving stand 24 Pipe receiving raising / lowering jack 25 Pipe 26 Pipe receiving stand 27 Walking arm 31 Header 32 Clamp 33 Walking arm 34 Blow receiving stand 35 Screw Type cooling bed 36 pipe 41 screw type cooling bed 42 fin 43 pipe

Claims (5)

  The steel pipe after pipe making is installed on a cooling bed where the steel pipe is gradually traversed and cooled, and the pipe inner surface blow header, pipe clamp device, blow cradle, and pipe cradle for loading multiple steel pipes at the tip A pipe inner surface bead waste removing device comprising a walking arm in a section. 2. The pipe inner surface bead according to claim 1, wherein the walking arm is composed of an arm for transporting the pipe from above the cooling bed to a blow cradle of a blow device, and an arm for lowering the pipe onto the cooling bed. Debris removal device. 3. The pipe inner surface bead waste removing device according to claim 1, wherein when the bead waste removal operation is not performed, the walking arm is retracted below the floor surface of the cooling bed. The pipe inner surface bead scrap removing device according to any one of claims 1 to 3, wherein the inner surface of the pipe is blown by water blow or a mixed blow of water and air. The ERW steel pipe continuously formed by the ERW pipe forming mill, the inner surface bead cutting device, the high-frequency heating device, and the reducer was cut to a predetermined length with a hot saw, then transported to the cooling bed and installed on the cooling bed. A method for producing an ERW steel pipe, characterized in that residual bead waste is removed by a pipe inner surface bead waste removal device.

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