JPS6346138Y2 - - 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 has been manufactured using static electricity to form a thin oil film of oil particles on the outer surface of the wire for purposes such as rust prevention and lubrication to ensure good feeding to the welding machine before winding it onto a winding drum in the final forming process. It is painted on.

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 and the oil will adhere to the feed rollers of the welding machine, causing slips and making it impossible to feed, or diffusible hydrogen in the weld metal will increase. 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 lubrication device, the atomized oil particles are conveyed to the charging electrode position by conveying air, charged, and applied to the material to be oiled. Excess atomized oil particles that remain without being applied to the material are discharged to the outside by the conveying air current, and are usually configured to be processed by an oil separation treatment device installed outside the device. It is. However, since the diameter of the atomized oil particles is extremely small, it is difficult to separate the excess atomized oil particles from the conveying air, which increases the complexity and size of the separation processing equipment and causes them to be discharged outside the equipment. If the amount of atomized oil particles increases, not only will the environment around the device be contaminated, but also the amount of oil consumed within the device will increase, resulting in inconveniences such as the need to frequently replenish the oil.

In view of the above, the present invention reduces the amount of atomized oil particles discharged to the outside by returning the conveying air containing excess atomized oil particles that are not coated onto the wire to the conveying air source via a circulation path. An object of the present invention is to provide a novel electrostatic oil coating device for wire rods that reduces the amount of oil applied.

In order to achieve the above object, the present invention provides an electrostatic lubricating device in which a charging electrode for charging atomized oil particles is disposed opposite to a moving path of a wire, in which the atomized oil particles are passed through the charged electrode. A conveying air source for supplying conveying air to be conveyed to the wire rod is provided, and a circulation path is provided for returning conveying air containing excess atomized oil particles that are not applied to the wire rod to the conveying air source. It is characterized by being arranged.

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

FIG. 1 is a longitudinal sectional view showing an electrostatic oil applicator according to the present invention, and FIG. 2 is a sectional view taken along the line A--A.

In the figure, reference numeral 1 denotes a grounded case body through which a welding wire 2 is horizontally moved in and out through an inlet guide 3 and an outlet guide 4, and an oil storage tank 5 at the bottom.
is installed. There is a temperature control circuit inside the oil storage tank 5.
A heater H whose temperature is controlled by TC is installed,
This prevents changes in the viscosity of the oil due to changes in outside temperature, and also heats and fluidizes the highly viscous oil.

Reference numeral 7 indicates a large number of atomizing nozzles arranged in parallel along the front plate 8 of the case body 1, and as shown in FIG. The liquid oil agent in the oil storage tank 5 is sucked through the suction strainer 12 by the compressed air supplied through the suction strainer 12, and the oil agent is atomized and sprayed.

Reference numeral 15 denotes a conveying air introduction pipe, and as shown in FIG.
7, and conveying air is introduced into the case body 1 through this introduction pipe 15. 18 is the introduction pipe 1
5, 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, which will be described later. It is regulated to prevent direct transport into the ionizer. This buff-full plate 18 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 20 denotes an ionizer disposed at the upper part of the full plate 18 at a required interval, and includes a horizontal plate 22 in which a long hole 21 parallel to the welding wire 2 fixed to the front plate 8 of the case body 1 is bored. and an inclined plate 25 having an oil passage hole 24 extending downward from the rear end edge and fixed to the rear plate 14. As is clear from FIG. 3, the ionizer 20 includes a pair of atomized oil guide walls 27 that guide atomized oil particles supplied through the elongated holes 21.
and an ionizer electrode 28 stretched between the guide wall 27 in two stages, upper and lower, and the atomized oil particles are charged by a high voltage applied to the ionizer electrode 28. In this case, the atomized oil guide wall 27 has an oil particle spout 29 formed at its upper end that closely opposes the welding wire 2, and the width thereof gradually becomes narrower toward the top, so that the atomized oil guide wall 27 has a tapered shape. It is hermetically sealed, and is configured so that coarse oil particles are collected and captured in the ionizer 20, and only charged oil particles with extremely fine particle sizes are intensively injected onto the welding wire 2 without leaking to the sides. has been done.

A convection hood 30 is disposed facing the ionizer 20 and the welding wire 2, and has an inverted U-shape in cross section. 32 is attached to the lower surface of a mounting plate 33 that accommodates the atomizing oil agent guide wall 27, and its lower end side edge is inclined to widen toward the end so as to form an oil particle passage 34 between it and the inclined plate of the atomized oil agent guide wall 27.

Reference numeral 35 denotes a driving electrode disposed in parallel with the welding wire 2 in the convection hood 30, to which a high voltage is applied and convecting oil particles are deposited on the welding wire 2.

FIG. 4 is a schematic system diagram showing the connection relationship with external devices. In the figure, 36 is a circulation path connected between the demister 32 and the air intake port of the blower 17, and the welding pipe is discharged through the demister 32. The conveying air containing excess atomized oil particles remaining without being applied to the spray wire 2 is returned to the blower 17. 37
38 is an oil separation treatment device connected to the circulation path 36 via an air volume adjustment closing damper 39; 40 is a high voltage generator for the ionizer electrode; 41 is an additional High voltage generator for internal electrode, 42 is oil temperature gauge, 43 is liquid level gauge, 44
is a limit switch for detecting the lower limit of the liquid level.

Next, the operation of the above device of the present invention will be explained.

First, the welding wire 2 is inserted into the case body 1 through the feeding guide 3 and the carrying out guide 4. Next, by opening the solenoid valve 9 installed in the compressed air supply pipe 11, compressed air is supplied to each atomizing nozzle 7 to atomize the oil into fine particles. At the same time, the blower 17 is driven to supply a required amount of transport air into the case body 1, and high voltages are generated from the high voltage generators 40 and 41 and applied to the ionizer electrode 28 and the chasing electrode 35, respectively. do.

When the welding wire 2 is transported at a required speed in this state, relatively fine particles of the oil particles atomized by the atomization nozzle 7 are transferred to the transport air introduction pipe 1.
5 and compressed air introduced through the atomizing nozzle 7.
8 and the front plate 8 of the case body 1, and is introduced into the ionizer 20 through the elongated hole 21.

The relatively fine oil particles introduced into the ionizer 20 are uniformly charged by the ionizer electrode 28 and some are collected on the atomized oil guide wall 27 . The ultrafine oil particles remaining without being collected are intensively sprayed onto the welding wire 2 from the spout 29 of the atomized oil guide wall 27, and together with the action of the driving electrode 35, the welding wire 2 is efficiently It is deposited well and uniformly, and an extremely thin oil film is formed on the welding wire 2.

Among the charged oil particles injected from the ionizer 20, the charged oil particles that are not adsorbed to the welding wire 2 and remain are introduced into the convection hood 30, and are once raised inside the convection hood 30 by the carrier airflow, and then returned to the hood 30. It descends along the inner wall toward the welding wire 2 side. At this time, the oil particles are recharged by the driving electrode 35, and the descending charged particles increase the density of the charged oil particles in the vicinity of the welding wire 2 and stably maintain it at a required value. 2. Assists in the deposition of charged oil particles on the upper surface side of 2.

Thereafter, the conveying air containing excess oil particles that have not been deposited on the welding wire 2 passes through the passage 34, passes through the demister 32, is discharged to the circulation path 36, and is returned to the blower 17, and a portion of the air contains oil particles. It is discharged to the separation processing device 38.

Note that when the amount of oil in the oil storage tank 5 decreases and the liquid level reaches the lower limit position, the detection limit switch 44 is activated to issue an alarm or automatically replenish the oil.

In the above embodiment, the convection hood 30 can be omitted, and the configuration of the ionizer 20 is not limited to the above example. It's okay.

Also, as shown by the chain line in Fig. 1, a convection hood 30
By arranging the dust collecting electrodes 45 on both outsides of the atomized oil particles to capture excess atomized oil particles, it is possible to further reduce the discharge of the atomized oil particles to the outside.

Furthermore, 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 conveying air containing excess atomized oil particles remaining without being applied to the wire is returned to the conveying air source via the circulation path, so that it is not exposed to the outside. It has excellent features such as being able to significantly reduce the amount of oil particles that are discharged, making it possible to simplify and downsize the oil separation treatment equipment installed externally, and reducing the amount of oil consumed and achieving resource conservation. have an effect.

[Brief explanation of drawings]

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 the line A-A, Fig. 3 is a perspective view of an example of the ionizer, and Fig. 4 is a schematic diagram of the device of the present invention. It is a system diagram. 1...Case body, 2...Welding wire, 7...
Atomization nozzle, 15... Conveying air introduction pipe, 17...
...Blower, 28...Ionizer electrode, 36...Circulation path.

Claims (1)

[Scope of utility model registration request] In an electrostatic oil applicator in which a charging electrode for charging atomized oil particles is arranged opposite to a moving path of a wire rod, conveying air is supplied to convey the atomized oil particles to the wire rod through the charging electrode. A wire rod characterized in that a conveying air source is provided and a circulation path is provided for returning conveying air containing excess atomized oil particles that are not applied to the wire rod to the conveying air source. Electrostatic oil applicator.