JPS6037190Y2 - Core wire feeding device for coated arc welding rods - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a core wire feeding device for coated arc welding rods, and more particularly to a core wire feeding device that can manufacture the same welding rods with good workability and yield.

In manufacturing coated arc welding rods, generally the core wire cut to a predetermined length is continuously fed from a feeding device to a flux extrusion coating die block, and the core wire and flux are simultaneously delivered from the die of the die block. The flux is applied to the outer periphery of the core wire by extrusion.

For example, Fig. 1 (partially cutaway side view) and Fig. 2 (partially cutaway side view) illustrate a conventional flux coating cross-dressing, and show the core wire supply device 1, flux extrusion coating 4 and 2, and the parts therebetween. It is composed of a guide pipe 3 that connects.

At the bottom of the supply device 1, there is a supply section that takes out the core wires 4 one by one and supplies them to the guide pipe 3, and the core wires 4 are sent from the device 1 through the guide pipe 3 to the flux extrusion coating 4 and 2. sent.

Then, flux is applied to the outer periphery of the core wire by the coating station 2 to form a coated arc welding rod 5, which is then transferred to a drying device by a suitable conveyor or other conveyance means (not shown).

That is, the supply section of the supply device 1 includes a pair of tapered rollers 6.
6' are arranged opposite to each other with their tapered surfaces facing upward, and receive the core wires 4 one by one and send them out toward the feeding roller 7° and 7'.

The feed rollers 7,7' then receive this core wire 4 and feed it into the guide pipe 3 one after another.

The core wires 4 are subsequently pushed by the core wires 4 in the guide pipe 3 and are fed in the direction of the extrusion coating device 2 without contacting each other.

The extrusion coating device 2 includes, for example, a cylinder 11 for storing flux, a piston 12 operated by hydraulic pressure, etc., a gui block 13, a die 14, and a gui block concentrically with the die 14, as shown in FIG. Consisting of a nipple 15 placed in a block 13, by moving the core wire 4 from the nipple 15 in the direction of the die 14 and advancing the piston 12 to push out the flux F in the direction of the die 14,
Flux F is applied to the outer periphery of the core wire 4.

By the way, the flux F is a hardened slurry that is hardened into a cake shape and is intermittently supplied into the cylinder 11. When the extrusion of the flux F in the cylinder 11 is finished, the piston 12 is retracted and a new flux is supplied. The cake is charged and extrusion by the piston 12 is performed again.

Therefore, from the end of the supply of flux F per batch until the introduction of a new flux cake (more precisely, until the flux F in the Gui block 13 reaches the predetermined coating pressure due to the advance of the piston 12), the process is as described above. It is also necessary to stop the supply of the core wire 4, and the supply of the core wire 4 is automatically stopped immediately upon receiving a signal indicating that the piston 12 has been press-fitted to a predetermined position.

However, if the core wire 4 is not inserted into the nipple 15 during this switching process, the flux F will flow back into the nipple 15 due to the pressure inside the Gui block 13 (residual pressure at stop or preliminary pressure increase at restart), causing clogging. This may make it impossible to supply the core wire 4 when painting is restarted.

In order to prevent this problem, it is sufficient to stop painting while the core wire 4 remains inserted into the nipple 15, as shown in FIG. 3, to prevent the flux F from flowing back into the nipple 15.

However, suppose the state shown in Figure 3 (part of the core wire is at nipple 15)
Even if coating is stopped in a state where the core wire 4 protrudes from the tip of the nipple 15, for example, as shown in FIG. becomes a hollow state, and the flux F enters into this part, causing clogging.

For this reason, it was not possible to reliably prevent poor or impossible feeding of the core wire 4 when painting was restarted.

For this reason, we conducted various studies on the optimal stopping position of the core wire, and found that if the tip of the core wire is located slightly deeper than the tip of the nipple 15 (typically 3Wn), the flux due to residual pressure will be reduced. It has been found that backflow can be virtually ignored, and therefore, the inability to start the next painting job due to clogging of the flanks can be almost certainly avoided.

However, since the above-mentioned stopping position depends on the distance between the surfaces of the core wire feeding roller 7.7' and the tip of the nipple 15, for example, the distance between the surfaces can be set to an integral multiple of the core wire.
By setting the length to be 77+, the optimum stopping position can be secured.

Regarding the timing of stopping the drive motor, the starting switch is turned off earlier by that amount in consideration of the time delay from turning off the starting switch of the drive motor until the core completely stops.

However, the standard length of the core wire varies depending on the brand, so in order to always ensure the optimum stopping position, it is necessary to change the distance between the surfaces according to the standard length of each core wire. The work was extremely complicated.

Therefore, it has been considered to adjust the feed using a drive motor so that the tip of the core wire is always fed to the optimal stopping position, but starting and stopping the operation of the drive motor is not suitable for delicate position adjustments. Ta.

Concerned about these circumstances, the inventors of the present invention conducted research in search of a specific means for always stopping the tip of the core wire at an optimal position, and finally completed the present invention.

That is, the configuration of the present invention is such that, in the above-mentioned wire feeding device, a low-speed one-side drive motor that operates after the main drive motor has stopped is provided in the drive section that sends the core wires to the painting section via the nipple, and a sub-drive motor is provided. The operating time of the drive motor is configured to be set according to the length of the core wire, and when painting is stopped, the core wire is controlled so that its tip comes to the optimal position of the tip of the nipple in preparation for the start of the next coating. Therein lies the gist.

The configuration and effects of the present invention will be explained below based on the drawings of the embodiments.

Components with the same configuration as the previous time are given the same reference numerals.

16 is a main drive motor, 17 is a sub-drive motor, 18 is a miter gear, and 19 is a drive transmission device. It is transmitted to the miter gear 18 by the belt Va, and further transmitted from the miter gear 18 to the drive transmission device 19 to drive the feed roller 7 and the taper roller 6.

On the other hand, the rotation of the sub-drive motor 17 is driven by pulleys 17a and 2.
The rotary power is transmitted to the miter gear 18 by the second belt vb wound around the serial timing pulley 18a, and the transmitted rotational power is further transmitted from the miter gear 18 to the drive transmission device 19 in the same manner as described above.

These two-line timing pulleys 18a are composed of a main drive pulley 20 and an auxiliary drive pulley 21, as shown in FIG. They are coaxially attached via a shaft 23.

That is, the main drive pulley 2 is rotated by the main drive motor 16.
0, the connection between the connecting shaft 23 and the sub-drive pulley 21 is released by the function of the one-way clutch 24, and the sub-drive pulley 21 becomes idling.

Conversely, when the rotation of the main drive motor 16 is interrupted and the rotation of the main drive pulley 20 gradually decreases, the function of the one-way clutch 24 causes the auxiliary drive pulley 21 and the connecting shaft 23 to
are connected.

Therefore, when the auxiliary drive motor 17 is driven in this state, the auxiliary drive pulley 21 starts driving, and the core feeding roller 7 and the tapered roller 6 are driven.

On the other hand, the distance between the surfaces of the fiber feeding roller 7 of the fiber feeding device and the tip of the nipple 15 is the same as the standard fiber length, for example, 40 mm.
0mm), approximately 3TIr! The length is adjusted by adding n.

Therefore, if a core wire with a length of 4001 ML is to be coated, the main drive motor alone may be used as in the conventional case.

FIG. 7 is an explanatory diagram when using a core wire having a length other than the standard length, where L is an integral multiple of the standard core length (for example, 400sn x 4), and 1 is a core wire that deviates from the standard. The length 1□ indicates the protruding length of the core wire in the process of being painted, which protrudes from the nipple tip 15, respectively.

That is, the distance between the surfaces of the core wire feeding roller 7 and the nipple tip 15a is L+3.

In the case of the example L+3 = 400mm x 4 pieces + 3
It is set to mm = 1603 mm.

By the way, under the above conditions, 1 = 35 orr, which is shorter than the standard
When coating is performed using rIn core wire and the main drive motor stops the core wire feeding when coating is interrupted, the core wire feeding roller 7 stops on the nipple 15 side from the core wire feeding roller 7. Five core wires can be arranged at the same time.

In other words, the distance from the feed roller 7 to the tip of the most advanced core wire is 1
×5=(350X 5 )=1750mm.

Therefore, the length of the core wire protruding from the nipple tip 15a is I□=
147 (1750-1603) Becomes rran.

In this state, the leading edge of the core wire will be pushed out by the residual pressure of the flux inside the Gui block 13.
In the present invention, the auxiliary drive motor with a small rise is driven to send out the most advanced core wire and actively push out the core wire by (1-11) in order to bring the next core wire to the nipple most extreme position.

The extrusion length at this time is 350mm - 147mm =
Although it corresponds to 203mm, it is most preferable that the tip of the trailing core wire is at a position 3rIrrIL recessed from the nipple tip 15a, so the actual extrusion length by the auxiliary drive motor is 203mm - 3rIrIrL = 20o7rrIn,
The sub-drive motor is driven by an amount to obtain a feeding length corresponding to 20-.

When the core wire is pushed out to this position, the rear end of the most advanced core wire will remain in the nipple 15 by 377+771 points, but since there is some residual pressure in the Gui block 13 as described above, the core wire will be pushed out to this position. Due to the residual pressure, the subsequent core wire pulled out in the core wire feeding direction will stop at a position 3 m deep.

When the insertion of new flux is completed, the main drive motor is operated again to continue normal flux painting work.

In addition, if a 450 mm core wire, which is longer than the standard core wire, is used, four core wires can be arranged between the feed roller 7 and the nipple 15 (450 mm x 4 core wires), and from the nipple tip 15a to The core wire protrusion length 1□ is 197 (4
50X 4-1603) rtrm.

Therefore, the most advanced core wire is sent out and the remaining core wires are 253.
(450-197) It is sufficient to move it forward by rrrm, and this is also done by the auxiliary drive motor in the same manner as above.

In this case, the extrusion length is 253mm - 3mm = 25
0mm, and the rear end of the most advanced core wire is 3rfr from the nipple tip 15a as before! Although the core wire remains in the recessed position, the core wire is pulled out by the residual pressure in the Gui block 13, and the subsequent core wire waits in the recessed position.

The operating timing of the main drive motor and the sub drive motor configured in this way is controlled as shown in the time chart of FIG. 8.

In other words, the main drive motor is turned off when flux painting is completed.
Therefore, it is confirmed that the rotational speed of the main drive motor has decreased to, for example, about 5 orpm.

Then, after T1 seconds have elapsed after this confirmation, the main drive motor will completely stop, and in its place the auxiliary drive motor will be activated, for example, at 30 rpm.
Driving is started at a low rotational speed of pm, and the core wires are aligned.

When the core wire reaches the optimum position, the auxiliary drive motor stops.

The driving time T2 of this sub-drive motor can be learned by learning, and in one example, the driving time T2 of the auxiliary drive motor is approximately 3.6 and 4 cm for a core wire of 350 ribs.
Approximately 2.625 seconds with a 0- core wire, and approximately 3.0 seconds with a 450 core wire.
It was 8 rin.

After the core wire positioning is completed and flux filling is performed, the main drive motor is turned on and normal painting operation begins.

After the main drive motor is turned off and until the auxiliary drive motor is started, it is preferable to keep the subsequent fibers in the fiber stocker 4a (Fig. 7) in a standby state, so the fiber stocker 4a
Activate the stopper for temporarily stopping the wire feeding below the
It is recommended to prevent contact between the tapered roller 6 and the core wire 4.

The present invention is constructed as outlined above, and the tip position of the core wire can be adjusted by a simple and reliable means when painting is stopped, thereby preventing flux from entering the nipple. This has made it possible to improve the stability of core wire feeding when painting is restarted.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway schematic side view showing the conventional flux coating method, Fig. 2 is a partially cutaway schematic plan view, and Figs.
FIG. 5 is a partially cutaway side view illustrating the coating station of the present invention;
FIG. 6 is a sectional view taken along the line ■-VI in FIG. 5, FIG. 7 is an explanatory diagram showing the line alignment state, and FIG. 8 is a time chart. 1... Core wire supply device, 2... Flux extrusion coating device, 3... Guide pipe, 4...
Curved core wire, 5... coated arc welding rod, 6. 6'
...Taper roller, 7,7'...Feed roller, 16...Main drive motor, 17...
... Sub-drive motor, 18... Miter gear.

Claims (1)

[Scope of utility model registration request] The core wire feeding device used in the manufacture of coated welding rods is equipped with a low-speed auxiliary drive motor that operates after the main drive motor stops, in the drive unit that sends the core wire to the coating area via the nipple, and the auxiliary drive motor is activated. A wire feeding device for a coated arc welding rod, characterized in that the time is set according to the length of the wire.