JPS60196294A - Apparatus for producing welded tubular body sealed powder internally - Google Patents

Abstract

PURPOSE:To fill uniformly and thoroughly powder into a tubular body and to produce the welded tubular body sealed the powder with high quality internally by controlling the feed rate of a powder feeder according to the change in the level of the accumulating surface of the powder in the tubular body. CONSTITUTION:The powder accumulating surface in a tubular body 10 is displayed on a display part 28 for a powder level and is at the same time recorded in a recorder 29 for powder level. When the powder accumulating surface is detected by a detector 11 for the upper limit position of the powder the detection signal is fed to an output processing circuit 27 from which a decrease signal is fed to a powder feeder control circuit 30. The feed rate of a powder feeder 8 is thereby so controlled as to decrease. When the powder accumulating surface is detected by a detector 12 for the lower limit position of the powder, the detection signal is fed to the circuit 27 from which an increase signal is fed to the circuit 30. The feed rate of the feeder 8 is thereby so controlled as to increase. The level of the powder accumulating surface in the body 10 is thus maintained always in the prescribed range.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention is a Franks-enclosed welding method used in semi-automatic and fully automatic arc welding; This invention relates to an apparatus for manufacturing a welded metal tubular body containing various powders for deoxidization and the like.

[Prior art]

Conventionally, as a method for producing a powder-filled welded tubular body, there is a method disclosed in Japanese Patent Publication No. 58-187600, namely: (1) A spool wound with a long metal tube is placed on a vibration table. By vibrating, the long coiled metal tube wound around the spool is vibrated, and the powder is blown into the air.
(2) A long metal strip is sequentially bent from both sides of the strip so that it has a circular cross section, and then the bent portions are joined by bath welding to form a tube. At the same time, a powder supply pipe that reaches the tubular body immediately after welding is inserted between the bent ends of the unbathed part, and the powder is continuously supplied from the powder supply pipe into the tubular body that is continuously molded. A method is known in which powder is supplied while the metal strip and tubular body are held horizontally or inclined.

However, in the case of method (1) above, if the powder contains particles with differences in specific gravity and particle size, the particles will separate due to the difference in specific gravity and particle size, and therefore a uniform particle distribution will not be achieved. It has a quality disadvantage in that it cannot be filled in the same state, and in addition, it takes a huge amount of time to fill the entire length of the long coiled metal tube wrapped around the stool, making it extremely inefficient. There is a problem.

In addition, in the case of method (2) above, it is difficult to densely fill the tubular body with powder while keeping the tubular body production line horizontal, and unfilled voids occur, so high quality products cannot be obtained. Moreover, when the powder-filled welded tubular body is wound up or transported, the powder inside the tubular body is biased υ.

In addition, when the tubular body production line is inclined in the method (2) above, since there is no means for controlling the welding speed of the tubular body relative to the powder filling speed, the powder will accumulate at a predetermined position in the tubular body immediately after welding. It is difficult to maintain the surface reliably and stably, and if the surface on which the powder is deposited is too close to the welding area, there are problems such as the powder deteriorating due to welding heat and gas generation from the powder. Furthermore, if the powder deposition surface is too far away from the welding part, there is a problem that the powder filling becomes incomplete and it becomes difficult to confirm the filling state.

[Purpose and structure of the invention]

The object of the present invention is to provide a powder-filled welded tube♂ball manufacturing apparatus that can advantageously solve the above-mentioned problems. On the inclined tubular body production line between the strip feeding stool 2 and the tubular body take-up spool 4 disposed diagonally below, the metal strip 1 is sequentially bent and formed into a tubular body in cross section. A welding tool 5 for joining the roll group and the bent end of the metal strip 1 by welding is provided, and a powder 6 is contained therein. -7 connected via powder feeder 8
In an apparatus for manufacturing a powder-filled welded tubular body, in which a powder supply pipe 9 is inserted into a tubular body 10 from between the bent ends of the metal strip 1, the lower end of the powder supply pipe 9 and the bath contact point. A powder upper limit position detector 11 and a powder lower limit position detector 12 are arranged with an interval in the vertical direction at a position facing the tubular body 10 at a lower level, and each detector 11.12
is an illuminating device that reduces the supply amount of the powder feeder 8 when the powder lower limit position detector 11 is activated and increases the supply amount of the powder feeder 8 when the powder lower limit position detector 12 is activated. feeder supply amount 1tilj
This apparatus is characterized in that it is connected to a control device 11.

C Example] Next, the present invention will be explained in detail using illustrated examples.

The drawing shows one embodiment of the present invention, which shows a strip feeding spool 2 around which a long metal strip 1 such as a steel strip is wound, and a tubular body in a winder 14 provided diagonally below the strip feeding spool 2. On the inclined tubular body manufacturing line between the winding spool 4 and the winding spool 4, there are guide rolls 15 facing both sides of the metal strip 10, and a first forming roll that sequentially bends and forms the metal strip 1 so that it has a circular cross section. A forming roll group consisting of forming rolls 16 to 4th forming rolls 19, a welding tool 5 consisting of a welding power supply terminal connected to a welding power source 20, and a pressure welding roll 21 are sequentially arranged from above to below, and the tubular body take-up spool 4 is variable speed electric motor 2
2 via a speed reduction device (not shown).

A horn containing powder 6 for welding flux or other purposes -'I? The inlet of a powder feeder 80 having an electrically controlled supply amount adjustment device is connected to the outlet of -7 through an on-off valve 2, and the upper part of the powder supply pipe 9 is connected to the powder feeder through an on-off valve 24. 8, and the powder supply pipe 9 is connected to the center of the tubular body from between the sixth forming roll 18 and the fourth forming roll 19 and between the bent end of the metal strip immediately before the tubular body is completed. The powder supply pipe 9 is inserted diagonally downward along the line, and the lower end of the powder supply pipe 9 is arranged at a slightly lower level than the pressure roll 21.

Note that the powder feeder 8 may have a powder amount of "", for example.
It consists of a knotted casing having a powder amount of 1", a spruce for supplying powder housed in the sonocasing, and a drive device such as a DC motor that rotates the screw at a freely adjustable speed. is used.

A powder upper limit position detector 11 is disposed at a position close to the outer surface of the tubular body 10 at a level slightly lower than the lower end of the powder supply pipe 9, and a powder upper limit position detector 11 is disposed below the powder upper limit position detector 11. In this case, a powder accumulation surface monitoring detector 25 and a powder lower limit position detector 12 close to the outer surface of the tubular body 10 are arranged in sequence, and each of the detectors 11, 12.25 is, for example, the tubular body 10. A detector consisting of a gamma ray projector and a gamma ray sensor sandwiched in opposition is used.

Each of the detectors 11, 12.25 has a detection signal processing circuit 26.
A human power section of an output processing circuit 27 is connected to the output section of the detection signal processing circuit 26, and a powder level display section 28 and a powder level display section 27 are connected to the output section of the output processing circuit 27. The body level recorder 29 is connected to a powder feeder control circuit 60 that controls the supply amount of the powder feeder 8, and the detection signal processing circuit 26. The output processing circuit 27 and the powder feeder control circuit 0 constitute a feeder supply amount control device 1.

The powder supply pipe 9. Feeder supply amount control device 13, guide roll 15. Forming roll group 16-19° pressure roll 21. The powder feeder 8 and the like are supported by an inclined support roller 1, and the inclined support roller 1 is pivotally connected to a base 62 by a horizontal shaft roller 6, and the inclined support roller 1 and the base roller 2 are supported. They are connected via a hydraulic pressure/cylinder filter 4 for adjusting the table inclination.

Next, the operation of the apparatus of the above embodiment will be explained.

The metal strip 1 continuously fed out from the feeding spool 2 is smoothed by a straightening device (not shown), and then smoothed by the first forming roll 16 to the fourth forming roll 19 and the pressure roll 21. As shown in FIGS. 9 to 9, the metal strip 1 is successively shaped from both sides in the rIJ direction so as to have a circular cross section, and immediately after passing the fourth forming roll 19, the bent end of the metal strip 1 is welded. Combined tubular body 1
The powder 6 in the hopper 7 is transferred to the powder feeder 8 in the tubular body 10 that is continuously manufactured in this way.
The powder is continuously supplied through the powder supply pipe 9 to produce a powder-filled welded tubular body 65 as shown in FIG. 10, and the tubular body 65 is wound onto the take-up spool 4.

The powder accumulation surface 66 in the tubular body 10 is connected to the powder level display section 28.
The display source is displayed and the powder level is recorded in 29.
When the powder accumulation surface 66 is detected at the powder upper limit position by the director 11, the detection signal is sent to the output processing circuit 27 via the detection signal processing circuit 26.
A reduction signal from the powder feeder 8 is sent to the powder feeder control circuit 3o, and the feed amount of the powder feeder 8 is controlled to decrease. The crushed powder accumulation surface 66 is the powder lower limit position detector 12
When detected, the detection signal is sent to the output processing circuit 27 via the detection signal processing circuit 264, and the increase signal from the output processing circuit 27 is sent to the powder feeder control circuit 60.
The amount of powder fed to the powder feeder 8 is controlled to increase. Therefore, the tubular body 10 that is continuously manufactured
The level of the powder deposition surface 66 within is always maintained within a predetermined range.

The starting end of the tubular body 10 is closed by an appropriate means before being wound around the tubular body take-up spool 4, and after the filling of powder into the tubular body is completed, the tubular body is closed by an appropriate means at the end of the powder filling. The body 10 is subjected to a closing process.

When carrying out this invention, high frequency welding and plasma welding are used as means for welding the bent end of the metal strip.

Any welding means such as TIG welding or DC electric bath welding may be employed.

〔Effect of the invention〕

According to this invention, on the inclined tubular body manufacturing line between the strip feeding spool 2 around which the metal strip 1 is wound and the tubular body take-up spool 4 placed diagonally below it, the metal A group of forming rolls for sequentially bending and forming the strip 1 into a circular cross-section and a bath joint 5 for joining the bent ends of the metal strip 1 by welding are provided. In an apparatus for producing a powder-filled welded tubular body, in which a powder supply pipe 9, which has been connected to a powder feeder 8 through a powder feeder 8, is inserted into a tubular body 10 from between the bent ends of the metal strip 1. , a powder second limit position detector 11 and a powder lower limit position detector 12 are located at a position opposite to the tubular body 10 at a level lower than the lower end of the powder supply pipe 9 and the bath contact point, and are spaced apart in the vertical direction. The detectors 11 and 12 are arranged to reduce the supply amount of the powder feeder 8 when the powder upper limit position detector 11 is activated, and to reduce the amount of powder supplied when the powder lower limit position detector 12 is activated. Since it is connected to the feeder supply rate control device 1 which works to increase the supply rate of the powder feeder 8, it automatically adjusts the supply rate of the powder feeder 8 according to the level change of the powder accumulation surface 36 in the tubular body 10. The level of the powder deposition surface 66 can be automatically maintained within a predetermined range by controlling the powder uniformly within the tubular body 10 without deteriorating the quality of the powder due to welding heat. It is possible to produce a high-quality powder-filled welded tubular body by filling the swatch with the powder.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a schematic side view showing an apparatus for manufacturing a powder-filled welded tubular body, and FIG.
The figure is a partial vertical schematic side view showing an enlarged view of a part of the manufacturing equipment, FIG. 6 is a partly vertical enlarged side view showing a powder accumulation surface level detection control device in the manufacturing equipment, and Figure 10 is a sectional view showing the order in which the metal A17 plates are sequentially bent and formed to produce a tubular body, and then a powder-filled tubular body is manufactured, taken along the A-A-G-G line in Figure 1. It is a figure corresponding to a position. In the figure, 1 is a metal strip, 2 is a strip feeding spool, and 4 is a metal strip.
is a tubular body take-up spool, 5 is a welding tool, 6 is a powder, 7I''
iHosonogu-18 is a powder feeder, 9 is a powder supply pipe,
10 is a tubular body, 11 is a powder upper limit position detector, 12 is a powder lower limit position detector, 16 is a feeder supply amount control device, 1
4 is a winding machine; 16 to 19 are first to fourth forming rolls; 21 is a pressure roll; 22 is a motor; 25 is a detector for monitoring the powder accumulation surface; 26 is a detection signal processing circuit; 27
28 is an output processing circuit, 28 is a powder level display unit, 29 is a powder level recorder, filter 0 is a powder feeder control circuit, filter 1 is an inclined support stand, 64 is a pressure cylinder for adjusting the support stand inclination, 6
5 is a powder-filled welded tubular body, and 36 is a powder deposition surface.

Claims (1)

[Claims] The metal strip 1 is placed on an inclined tubular body production line between the strip feeding spool 2 on which the metal/jty plate 1 C is wound and the tubular body take-up spool 4 disposed diagonally below the spool 2. A welding tool 5 that connects the bent end of the metal strip 1 by welding to a group of forming rolls that are sequentially bent and formed into an in-plane shape of 1 mm.
A powder supply pipe 9 is connected to the pumper 7 containing the powder 6 via the powder feeder 8 and is connected to the tubular body from between the bent ends of the metal strip 1. In the apparatus for producing a tubular body in contact with a powder-enclosed bath, the lower end of the powder supply pipe 9 and the bath contact area are also at a low level, and the upper limit position of the powder is placed at a position facing the tubular body 10. A detector 11 and a powder lower limit position detector 12 are arranged at intervals in the vertical direction, and each detector 11.12
#Feeder supply amount control device that operates to reduce the amount of powder feeder 8 supplied when the detector 11 is activated and to increase the amount of powder feeder 8 supplied when the powder lower limit position detector 12 is activated. 16. An apparatus for manufacturing a powder-filled welded tubular body, characterized in that the apparatus is connected to a pipe 16.