JPH0111325Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement in an electrostatic oil coating device that forms a thin oil film on the outer circumferential surface of a wire, such as a welding wire.

In recent years, welding wire is coated with a thin oil film of oil particles on the outer circumferential surface of the wire using static electricity for the purpose of rust prevention or for better feeding to the welding machine before being wound onto a take-up drum in the final forming process. I'm wearing it.

The reason for applying a thin oil film using static electricity is
It is difficult to form a uniform oil film on the outer circumferential surface of the wire with conventional lubricating devices that pass through oil-impregnated fibers, and frictional resistance with the wire guide etc. when feeding the wire to the welding machine is difficult. It increases and becomes impossible to send.
Also, if you try to form a uniform oil film, the amount of oil applied will increase, causing oil to adhere to the feed rollers of the welding machine, causing slips and making it impossible to feed, and diffusible hydrogen in the weld metal. This is because electrostatic oil application has the advantage of being able to form a thin, uniform oil film with a small amount and requiring only a small amount of oil consumption.

By the way, in the conventional electrostatic oil applicator, a charged electrode is arranged opposite to the transfer path of the welding wire, and the charged atomized oil particles are applied to the welding wire that is transferred at high speed. It is normal to do so. However, simply charging the atomized oil particles and applying them to the welding wire will not work.
The problem arises that coarse oil particles adhere to the welding wire, resulting in an uneven oil film thickness.Furthermore, the welding wire transfer speed is as high as 150 to 1500 m/min, making it difficult to form a uniform oil film. is difficult,
This method has disadvantages in that the amount of oil applied cannot be maintained strictly within an allowable range and that the surface area of the welding wire is small, making it impossible to efficiently apply oil particles to the welding wire.

In view of the above, the present invention is a novel method that guides the oil particles charged by the ionizer electrode with the atomized oil guide wall and sprays only the fine oil particles onto the wire rod in a concentrated manner, thereby uniformly and efficiently coating the wire. The purpose of the present invention is to provide an electrostatic oil coating device for wire rods.

The present device has an ionizer comprising an ionizer electrode and an atomized oil guide wall surrounding the electrode, and the atomized oil particles are carried by the conveying airflow and are charged while passing through the ionizer. The ejection part of the ionizer for ejecting the ionizer toward the wire rod is formed in a tapered shape, and is provided with a transfer speed detection means for detecting the transfer speed of the wire rod, and the ionizer is equipped with a transfer speed detection means for detecting the transfer speed of the wire rod, and the ionizer is equipped with a transfer speed detection means for detecting the transfer speed of the wire rod. and a conveying air volume control mechanism that controls the air volume of the conveying air flow in direct proportion to the wire transfer speed, and a high voltage control mechanism that controls the voltage applied to the ionizer electrode in inverse proportion to the wire rod transfer speed. This is what happens.

Embodiments of the present invention will be described below based on the drawings.

1 and 2 are a longitudinal cross-sectional view and a cross-sectional view taken along the line A--A of the electrostatic oil applicator according to the present invention, respectively.

In the figure, reference numeral 1 denotes a grounded case body through which a welding wire 2 is horizontally carried in and out through a carry-in guide 3 and a carry-out guide 4, and an oil storage tank 5 at the bottom.
is installed. Slots 6 are formed in the carry-in guide 3 and the carry-out guide 4, respectively, to facilitate insertion of the welding wire 2.

Atomization nozzles 7 suck and atomize the oil in the oil storage tank 5, and are arranged in large numbers along the longitudinal direction of the case body 1. The oil in 5 is sucked through a suction strainer 9, and the oil is atomized and sprayed.

Reference numeral 10 denotes a conveying air introduction pipe, and as shown in FIG.
2, and conveying air is introduced into the case body 1 through this introduction pipe 10. 13 is the introduction pipe 1
It is a round plate disposed on the upper part of the case body 1, which extends obliquely forward and downward from the rear plate 14 of the case body 1, and is used to collect relatively coarse particles among the oil particles atomized from the atomization nozzle 7. It is regulated to prevent direct transport into the ionizer. The buff-full plate 13 is usually made of a flat plate, but may also be made of a permeable plate made of punched metal or the like.

Reference numeral 15 denotes an ionizer disposed on the top of the full plate 13 at a required interval, and is a horizontal plate in which a long hole 17 parallel to the welding wire 2 fixed to the front plate 16 of the case body 1 is bored. 18 and an inclined plate 19 extending downward from the rear end and fixed to the rear plate 14.
As is clear from FIG. 3, the ionizer 15 includes a pair of atomized oil guide walls 21 that guide atomized oil particles supplied through the elongated hole 17, and a structure that is arranged in two stages, upper and lower, between the guide walls 21. The atomized oil particles are charged by the high voltage supplied to the ionizer electrode 22.
In this case, the atomized oil guide wall 21 is made of a conductive plate such as a metal plate or an insulating plate such as a vinyl chloride resin plate,
The oil particle spout 23 formed at the upper end that closely faces the welding wire 2 is selected to have a tapered shape with a width that gradually becomes narrower toward the top, and both sides are sealed. The oil particles are collected and captured in the ionizer 15, and the structure is such that only the charged oil particles with extremely fine particle diameters are sprayed intensively onto the welding wire 2 without leaking laterally.

A convection hood 24 is disposed facing the ionizer 15 and the welding wire 2, and has an inverted U-shape in cross section. The atomizing oil guide wall 26 is attached to the lower surface of a mounting plate 27 that accommodates the atomizing oil agent guide wall 26, and its lower end side edge is inclined to widen toward the end so as to form an oil particle passage 28 between it and the inclined plate of the atomizing oil agent guide wall 21. Therefore, the charged oil particles ejected from the ionizer 15 are convected within the hood 24 and are again directed toward the welding wire 2 and discharged through the oil particle passage 28, so that the density of the oil particles near the welding wire 2 is stabilized. At the same time, the oil particles can be applied to the entire circumferential surface of the wire 2.

Reference numeral 29 is a driving electrode that is stretched in parallel with the welding wire 2 in the convection hood 24, and is used to direct the convecting oil particles to the welding wire 2 to which a high voltage is applied.
deposit on top.

Next, a method of controlling the amount of oil applied depending on the transfer speed of the welding wire 2 will be explained with reference to the schematic system diagram shown in FIG. 4. In addition, in FIG. 4, the direction in which the welding wire 2 is transported is changed to a direction perpendicular to the ionizer 15 for convenience of explanation.

Reference numeral 30 is a tachometer generator that detects the transfer speed of the welding wire 2, and generates a DC voltage according to the transfer speed of the welding wire 2.

Reference numeral 31 denotes a drive motor for the blower 12 to which the output voltage of the tachogenerator 30 is supplied via an inverter 32 with a ratio and bias setting device, and the rotation speed is controlled in direct proportion to the transfer speed of the welding wire 2.

Reference numeral 33 is a high voltage generator for the ionizer electrode, in which the output voltage of the tachogenerator 30 is supplied via an inverting amplifier 34, a voltage regulator 35, and a ratio/bias setting device 36, and is inversely proportional to the transfer speed of the welding wire 2. The output voltage is controlled by When the voltage applied to a general charging electrode is increased (or decreased), the amount of oil particles that adhere to the welding wire 2 usually increases (or decreases), resulting in an amount that is proportional to the applied voltage. However, in this example, the atomized oil guide wall 2 surrounds the ionizer electrode 22.
1, as the voltage applied to the ionizer electrode increases, the amount of particles adsorbed and captured on the guide wall 21 increases, and the amount of oil particles on the welding wire 2 increases in inverse proportion to the applied voltage. The coating amount decreases.

Therefore, when the speed of the welding wire 2 is low, the required amount of oil can be applied to the welding wire 2 by increasing the voltage applied to the ionizer electrode 22 and controlling the air volume of the blower 12 to a low level by controlling the motor 31. From this state, as the transfer speed of the welding wire 2 increases, the voltage applied to the ionizer electrode 22 is linearly decreased and the air volume of the blower 12 is linearly increased. Welding wire 2
can be controlled to a constant amount regardless of the transfer speed.

Note that 37 is a high voltage generator for the driving electrode.

The above is an example of the configuration of the present invention.Next, its operation will be explained with reference to FIG. 4.

First, the welding wire 2 is inserted into the case body 1 through the carry-in guide 3 and the carry-out guide 4. Next, by opening the solenoid valve 38 installed in the compressed air supply pipe 8, compressed air is supplied to each atomizing nozzle 7 to atomize the oil into fine particles. At the same time, the drive motor 31 is driven to supply a required amount of conveying air from the blower 12 into the case body 1, and high voltage is generated from the high voltage generators 33 and 37.
These are the ionizer electrode 22 and the driving electrode 2, respectively.
9.

Next, the welding wire 2 is transported at a required speed. In response to this, a detection voltage corresponding to the transfer speed of the welding wire 2 is generated from the tachogenerator 30, and this is supplied to the drive motor 31 and the ionizer high voltage generator 33, respectively.
is controlled to the optimum air volume according to the wire transport speed, and the voltage applied to the ionizer electrode 22 is controlled to the optimum voltage according to the wire transport speed.

Therefore, among the oil particles atomized by the atomization nozzle 7, relatively fine particles are transferred to the conveying air introduction pipe 1.
0 and compressed air introduced through the atomizing nozzle 7.
3 and the front plate 16 of the case body, and is introduced into the ionizer 15 through the elongated hole 17.

The relatively fine oil particles introduced into the ionizer 15 are uniformly charged by the ionizer electrode 22, and some are collected on the atomized oil guide wall 21. Then, the ultrafine oil particles remaining without being collected are intensively sprayed onto the welding wire 2 from the tapered spout 23 of the atomizing oil guide wall 21, and together with the action of the driving electrode 29, welding is performed. The oil is efficiently and uniformly deposited on the welding wire 2, and an extremely thin oil film is formed on the welding wire 2.

Among the charged oil particles injected from the ionizer 15, the charged oil particles remaining without being adsorbed by the welding wire 2 are introduced into the convection hood 24, and are once raised inside the convection hood 24 by the carrier airflow, and then returned to the hood 24. It descends along the inner wall toward the welding wire 2 side. At this time, it is recharged by the driving electrode 29. These descending charged particles improve the density of charged oil particles near the welding wire 2 and maintain it at a required value, assisting the deposition of charged oil particles on the upper surface of the welding wire 2, and then depositing them. The remaining oil particles pass through the passage 28 and pass through the demister 26, and are collected by an external collection device 39.

In addition, in the above embodiment, the oil particle spout 23 of the atomized oil guide wall 21 of the ionizer 15 is not limited to the linearly tapered shape formed by the inclined plate as in the above example, but is also formed into an arcuately tapered shape. Alternatively, only the inner surface that guides the oil particles can be tapered. Furthermore, in addition to forming the guide wall 21 in a cylindrical shape, it is also possible to just open both sides and make them face each other.

Similarly, the shape of the convection hood 24 is not limited to the above example, as long as it is configured to cause the charged oil particles injected from the ionizer 15 to convect and return to the welding wire 2 side.

Further, the present invention is applicable not only to welding wire but also to forming an oil film on any other wire.

As described above, according to the present invention, the atomized oil guide wall is disposed to surround the ionizer electrode, and the atomized oil jetting part formed by the guide wall is formed in a tapered shape. Coarse-sized oil particles are collected and captured in the ionizer, and the volume of the airflow that transports the atomized particles is controlled in proportion to the transport speed of the wire passing through the ionizer, and the voltage applied to the ionizer electrode is controlled. Since the control is made inversely proportional to the transfer speed of the wire rod, only the atomized oil particles with extremely fine particle diameters charged by the ionizer electrode are sprayed out in a concentrated manner without scattering onto the wire rod, efficiently and uniformly. This has excellent effects such as accurately controlling the amount of oil applied to the wire and reducing oil consumption.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing an example of the device of the present invention, Fig. 2 is a sectional view taken along line A-A thereof, Fig. 3 is a perspective view showing an example of an ionizer, and Fig. 4 is applicable to the present invention. FIG. 2 is a schematic system diagram showing an oil application amount control circuit. 1...Case body, 2...Welding wire, 7...
Atomization nozzle, 12... Blower, 15... Ionizer, 21... Atomized oil guide wall, 22... Ionizer electrode.

Claims (1)

[Scope of utility model registration request] The atomized oil particles carried by the conveying air stream are
In an electrostatic lubricating device that charges and coats the wire by an ionizer electrode placed opposite to the transfer path of the wire and to which a high voltage is applied, the device applies the ionizer electrode and the mist surrounding the electrode. and an ionizer comprising an atomized oil agent guide wall, and an ejection portion of the ionizer for ejecting atomized oil particles carried by the conveying airflow and charged while passing through the ionizer toward the wire rod. It is formed in a tapered shape and includes a transfer speed detection means for detecting the transfer speed of the wire rod, and based on a detection signal from the transfer speed detection means, the air volume of the conveying airflow is directly proportional to the transfer speed of the wire rod. 1. An electrostatic oil coating device for a wire rod, comprising: a conveyance air volume control mechanism that controls the flow rate of the wire; and a high voltage control mechanism that controls the voltage applied to the ionizer electrode in inverse proportion to the wire transfer speed.