JP4188940B2 - Electrostatic oiling equipment - Google Patents

Description

  The present invention relates to an electrostatic oiling device, and more particularly, an electrostatic oiling agent for spraying an oil-based liquid toward the surface of an oil-coated body under the action of static electricity and applying oil in a short time. Relates to the device.

  Referring to FIG. 4, conventionally, in the electrostatic oiling device 101, a lubricating oil, a release oil, or the like is applied to the surface of an oil-coated body 103 such as a metal such as steel or aluminum, or a product of other materials. Alternatively, when an oil-based liquid such as food oil (hereinafter simply referred to as “liquid”) is applied, for example, the oil-coated body 103 is transported by a work transport device such as a conveyor device, and the work transport is performed. An electrostatic oiling device 101 is provided in the middle of the apparatus, and a liquid is sprayed from the nozzle 105 of the electrostatic oiling device 101 toward the surface of the oil-coated body 103 under the action of static electricity, so that it is instantaneously covered. Oiling body 103 is oiled. The nozzle 105 is a blade type nozzle.

  The electrostatic oil coating apparatus 101 includes a plurality of nozzles 105 provided with a plurality of liquid discharge flow channel groups 107 to be discharged toward the oil-coated body 103, and the plurality of discharge flow channel groups 107. The oil supply hydraulic circuit is composed of a liquid supply line 109 that communicates to supply liquid and an electromagnetic valve 111 that opens and closes the liquid supply line 109.

  Further, the oil coating hydraulic circuit is configured such that the liquid is supplied from the liquid tank 117 to the liquid supply line 109 by the liquid pump 115 driven to rotate by the liquid motor 113. The electromagnetic valve 111 and the liquid tank 117 are connected by a pipe line 116, and an electromagnetic valve 118 is provided in the middle of the pipe line 116.

  Further, the conventional electrostatic oiling device 101 includes a nozzle head 127 in which a large number of shims 125 are arranged as electrodes in a slit 123 formed between a pair of nozzle blades 119 and 121. It has been. The nozzle blades 119 and 121 are made of an electrically insulating material, and are provided with a length that is greater than the length of the oil-coated body 103. The shim 125 is made of a conductive material made of a stainless steel sheet having a thickness of about 0.5 mm, for example, and has a length of about 100 to 150 mm, for example. Accordingly, a large number of shims 125 are arranged in the horizontal direction, and are arranged so that the total length thereof is the same as the total length of the nozzle blades 119 and 121.

  Further, between the surface of the shim 125 and the adjacent surface of the nozzle blade 119, a liquid discharge channel group 107 to be discharged toward the oil-coated body 103 is formed. For example, the discharge flow path group 107 is etched at a groove depth C on one side of the shim 125. Note that a liquid supply port 129 for supplying liquid is communicated with the discharge flow path group 107.

  Referring to FIGS. 5A, 5B, and 5C together, for example, as the shim 125, the oil reservoirs 131A and 131B and the discharge flow path groups 107A and 107B are disposed on the left surface in FIG. 5B. Are etched at a depth C of about 0.25 mm, for example, and a liquid supply port 129 for supplying liquid to the oil sumps 131A and 131B connected to the discharge flow path groups 107A and 107B is communicated.

  The oil sumps 131A and 131B communicate with a pair of liquid supply ports 129 in the nozzle blade 119 of the electrostatic oiling apparatus 101, and these liquid supply ports 129 are connected to the electromagnetic valve 111 and the liquid supply pipe as shown in FIG. It is connected to the liquid pump 115 via the passage 109.

  The discharge flow channel groups 107A and 107B act as capillary resistances, the resistance value is proportional to the length of the flow channel, and the flow rate is inversely proportional to the square of the length. The oil application widths of the fluids discharged from the discharge flow path groups 107A and 107B are WA and WB, respectively. Therefore, by opening and closing the solenoid valve 111 on the upstream side of each of the discharge flow path groups 107A and 107B, the oil coating width as a whole of the shim 125 is changed to WA, WB, and WA + WB according to the oil-coated body 103. It is possible.

  The relatively large circular openings 133 formed on both sides of the oil sumps 131A and 131B in the shim 125 are for passing fixing bolts to the support bracket and the like of the entire oiling device. In addition, a relatively small circular opening 135 disposed in the area adjacent to the sumps 131A, 131B is a stop for assembling the apparatus while maintaining liquid tightness between the shim 125 and the adjacent nozzle blades 119, 121. A screw is passed through.

  The final discharge port 137 of the discharge flow channel groups 107A and 107B formed as described above has a rectangular shape as shown in FIG. .75 mm × depth 0.25 mm, and the pitch of the discharge ports 137 of the discharge flow path groups 107A and 107B is, for example, 3.0 mm.

  Referring to FIG. 4 again, the nozzle head 127 of the nozzle 105 is connected to the shim 125 with a connector pin 141 that constitutes a power connector 139 as an electrode for applying a negative high voltage. The connector pin 141 protrudes outside the nozzle blade 121. The connector pin 141 is connected to a voltage booster 143 for supplying a high voltage current to the nozzle 105, and the voltage booster 143 is connected to a power source so that the voltage applied to the shim 125 is controlled when the liquid is ejected. It is connected to the control device 147 connected to 145.

  The oil-coated body 103 is grounded and has a positive potential. Therefore, when a negative DC high voltage (around −60 to −70 kV) is applied to the shim 125 via the connector pin 141, the liquid supplied from the liquid supply port 129 flows through the discharge flow path groups 107A and 107B. Since they are charged instantaneously while passing, charges of the same polarity repel each other. As a result, the liquid is atomized as fine particles having a uniform particle diameter and sprayed evenly from the tip of the nozzle head 127 toward the oil-coated body 103. The liquid diffusion width A on the oil-coated body 103 spreads evenly according to the amount of liquid sprayed.

  The liquid motor 113, the electromagnetic valve 111, and the electromagnetic valve 118 are configured to be controlled by a control device 147 (see, for example, Patent Document 1).

  The liquid in the liquid tank 117 is sent from the liquid tank 117 to the liquid supply line 109 by the liquid pump 115 driven to rotate by the liquid motor 113. First, with the electromagnetic valve 111 closed by the control device 147, the electromagnetic valve 118 is opened, returned to the liquid tank 117 via the conduit 116, and circulated.

Next, the electromagnetic valve 118 is opened with the electromagnetic valve 118 closed by the control device 147, and the liquid in the liquid supply pipe 109 passes through the liquid supply port 129 from each discharge port 137 of the discharge channel group 107 of the nozzle 105. Sprayed toward the surface of the application body 103.
JP 2002-79144 A

  By the way, in the conventional electrostatic oiling device 101, when the oil-based liquid is ejected from the nozzle 105, the applied voltage of the shim 125 is controlled by the control device 147 as shown in FIG. Zero) The voltage is increased from kV to a DC high voltage having a negative potential of, for example, −60 kV as the injection voltage JV. That is, liquid is ejected from the nozzle 105 when the applied voltage reaches −60 kV. However, it takes 200 msec (0.2 sec) for the applied voltage to rise to −60 kV, and when the applied voltage is stopped after the liquid is ejected from the nozzle 105 during tsec, the applied voltage is reduced from −60 kV. For example, it takes 20 seconds to drop to 0 (zero) kV.

  For example, when the oil-coated body 103 is conveyed by the conveyor device at a speed of, for example, 30 m / min or more, the oil-coated body 103 passes through the conveyor device in 1 to 2 seconds. The liquid sprayed from the nozzle 105 is applied to the surface in a short time of 1 to 2 seconds.

  However, in actuality, when the above-mentioned tsec is 2 sec, it takes 22.2 sec (= 0.2 sec + 2 sec + 20 sec) in total from when the applied voltage is applied to the shim 125 until the end. That is, 20.2 sec excluding the above-mentioned tsec is a time other than when the liquid is applied to the oil-coated body 103.

  Therefore, when the above-described oil-coated body 103 is intermittently conveyed by the conveyor device one after another, liquid is intermittently sprayed from the nozzle 105 in accordance with the position of the oil-coated body 103 that passes below the nozzle 105. However, because it is necessary to transport the next oil-coated body 103 to the lower side of the nozzle 105 with an interval of 20.2 sec or more for the above-mentioned reason, the transport speed of the oil-coated body 103 is reduced, There is a problem that it is difficult to increase productivity because the interval between the oil-coated bodies 103 placed on the conveyor device has to be increased, and the oil application efficiency is lowered.

  In addition, during the 20 seconds when the applied voltage drops from −60 kV to 0 (zero) kV, a little liquid is ejected from the nozzle 105, and this liquid becomes a fume to deteriorate the surrounding environment. was there.

  The present invention has been made to solve the above-described problems.

An electrostatic oiling device of the invention according to claim 1 includes a nozzle head made of an electrically insulating material having a pair of first and second nozzle blades facing each other;
A shim made of a conductive material disposed between the first and second nozzle blades ;
An electrode for applying a voltage having a polarity opposite to that of the oil-coated body to the shim;
A sump provided on one surface of the shim and a plurality of discharge passage groups extending downward, discharging oil-based liquid toward the oil-coated body and in the direction of flow of the oil-based liquid A discharge flow path group having one flow path groove toward the downstream side having a cross-sectional area corresponding to the application width of the oil-based liquid in a direction orthogonal thereto;
A liquid supply port communicating to supply the oil-based liquid in the discharge flow path group,
A plurality of outlets communicating with the one channel groove provided at the lower end of the discharge channel group;
A nozzle is configured with a protruding portion protruding downward in accordance with the width of the oil-coated body between the plurality of discharge ports,
Wherein to control the supply amount of supplying oil-based liquid to the liquid supply port, and raised from the discharge port in advance the discharge flow channel groups to said electrodes until a certain initial voltage without injecting the oil-based liquid, always initial voltage the spent state on, then the oil-based liquid over a period of ejection voltage allowed to further injecting the oil-based liquid when injecting the oil-based liquid from the discharge flow channel groups to the width of the article to be coated oil bodies And a control device that controls to drop to the initial voltage in the same time as the initial voltage.

In addition, in the electrostatic oiling apparatus of the present invention according to claim 2, in the electrostatic oiling apparatus, the initial voltage is preferably approximately −40 kV.

  As can be understood from the means for solving the above-described problems, according to the invention according to claim 1, the electrode is preliminarily applied with a constant initial voltage that does not inject the oil-based liquid from the discharge flow path group. Therefore, when the oil-based liquid is actually sprayed from the discharge flow path group toward the oil-coated body, if a certain spray voltage is further applied, the time until the initial voltage rises to the spray voltage However, it can be significantly shortened compared with the conventional case where the voltage is raised from 0 (zero) voltage to the injection voltage. Therefore, oil application efficiency can be improved and productivity can be increased. Also, the amount of oil can be reduced.

  Furthermore, the time until the voltage drops from the constant injection voltage to the initial voltage is almost the same as the time when the voltage rises, and can be greatly shortened compared to the conventional case. Productivity can be increased and the amount of oil can be reduced. In addition, it is possible to prevent the oil-based liquid from being ejected as fume as in the prior art.

  Embodiments of the present invention will be described below with reference to the drawings.

  Referring to FIG. 2, in the electrostatic oiling apparatus 1 according to this embodiment, the surface of an oil-coated body 3 such as a metal such as steel or aluminum, or a product of other materials, is provided with lubricating oil and mold release. When an oil-based liquid (hereinafter simply referred to as “liquid”) such as oil or food oil is applied, for example, the above-described oil-coated body 3 is transferred by a work transfer device such as a conveyor device (not shown). The electrostatic oiling device 1 is provided in the middle of the workpiece conveying device, and the liquid is sprayed from the nozzle 5 of the electrostatic oiling device 1 toward the surface of the oil-coated body 3 under the action of static electricity. Then, the oil-coated body 3 is instantly oiled. The nozzle 5 is a blade type nozzle.

  The electrostatic oil coating apparatus 1 includes a nozzle 5 provided with a plurality of liquid discharge channel groups 7 to be discharged toward the oil-coated body 3, and each of the plurality of discharge channel groups 7. The oil supply hydraulic circuit is composed of a liquid supply line 9 that communicates to supply the liquid and an electromagnetic valve 11 as an open / close valve provided to open and close the liquid supply line 9. ing.

  Furthermore, the oil coating hydraulic circuit is configured such that the liquid is supplied from the liquid tank 17 to the liquid supply line 9 by the liquid pump 15 driven to rotate by the liquid motor 13. The electromagnetic valve 11 and the liquid tank 17 are connected by a pipe 10, and an electromagnetic valve 12 is provided in the middle of the pipe 10.

  Further, the electrostatic oiling apparatus 1 includes a nozzle head 27 in which a large number of shims 25 are arranged as electrodes in a slit 23 formed between a pair of nozzle blades 19 and 21. It has been. The nozzle blades 19 and 21 are made of an electrically insulating material and are provided with a length that is greater than the length of the oil-coated body 3. The shim 25 is made of a conductive material made of a stainless steel sheet having a thickness of about 0.7 mm, for example, and in this embodiment, the length is about 100 to 150 mm, for example. Therefore, a large number of shims 25 are arranged in the horizontal direction, and are arranged so that the total length thereof is the same as the total length of the nozzle blades 19 and 21.

  Further, between the surface of the shim 25 and the adjacent surfaces of the nozzle blades 19 and 21, a liquid discharge channel group 7 to be discharged toward the oil-coated body 3 is formed. For example, the discharge flow path group 7 is etched at a groove depth C on one surface of the shim 25 (in this embodiment, the left side surface of the shim 25 in FIG. 2). A liquid supply port 29 for supplying a liquid is communicated with the discharge flow path group 7.

  3 (A), (B), and (C) are also referred to. For example, as shim 25, oil reservoirs 31A and 31B and discharge flow path groups 7A and 7B are disposed on the left surface in FIG. Are etched at a depth C, and the discharge flow channel groups 7A and 7B extend from the oil sumps 31A and 31B, and have a flow channel groove directed downstream. . The intervals between the flow channel grooves located at both ends on the most downstream side correspond to the oil application widths WA and WB of the liquid, and the oil application widths WA and WB can be set to about 50 mm, for example.

  The oil sumps 31A and 31B are communicated with the liquid supply ports 29 in the nozzle blade 19 of the oil coating apparatus, and these liquid supply ports 29 are respectively connected via the electromagnetic valve 11 and the liquid supply conduit 9 as shown in FIG. And connected to the liquid pump 15.

  The discharge flow path groups 7A and 7B act as capillary resistances, the resistance value is proportional to the length of the flow path, and the flow rate is inversely proportional to the square of the length. The oil application widths of the fluid discharged from the discharge flow path groups 7A and 7B are WA and WB, respectively. Therefore, by opening and closing the solenoid valve 11 on the upstream side of each discharge flow path group 7A, 7B, the oil coating width as a whole of the shim 25 is changed to WA, WB, WA + WB according to the oil-coated body 3. It is possible.

  The relatively large circular openings 33 formed on both sides of the oil sumps 31A and 31B in the shim 25 are for passing fixing bolts to the support bracket and the like of the entire oiling device. Also, the relatively small circular opening 35 disposed in the area adjacent to the sumps 31A, 31B is a stop for assembling the apparatus while maintaining the liquid tightness between the shim 25 and the adjacent nozzle blades 19, 21. A screw is passed through.

  Further, in this embodiment, one flow groove is disposed as the discharge flow path groups 7A and 7B in the oil coating widths WA and WB, respectively, and the discharge flow path groups 7A and 7B formed as described above are provided. The discharge port 37 of the final flow path of 7B has a rectangular shape as shown in FIG. 3C, and the discharge flow path when the liquid flows in each of the discharge flow path groups 7A and 7B. The groups 7A and 7B are configured to be expanded so as to minimize the resistance force generated from the wall surfaces and the viscosity of the liquid. Compared with the conventional discharge port, it is greatly expanded, and as an example of each discharge port 37 of this embodiment, there is a single flow path instead of a large number of flow paths. It is 48.0 mm × depth 0.5 mm, and the pitch of the discharge ports 37 of the discharge flow path groups 7A and 7B is 50.0 mm.

  Further, the thick portion 39 at the boundary between the discharge flow path groups 7A and 7B is provided with a protruding portion 41 that protrudes downward by, for example, 0.6 mm in FIG. . For example, when the discharge flow path group 7A is used and the discharge flow path group 7B is not used, the protruding portion 41 matches the width of the oil-coated body 3 to be coated. This is to improve the liquid leakage of the liquid ejected from the outlet 37.

  Referring to FIG. 2 again, the nozzle head 27 of the nozzle 5 is connected to a connector pin 45 constituting, for example, a power connector 43 as an electrode for applying a negative high voltage to the shim 25. The connector pin 45 is provided so as to protrude from the side surface of the nozzle blade 21 (or 19). The connector pin 45 is connected to a voltage booster 47 for supplying a high voltage current to the nozzle 5, and the voltage booster 47 is connected to a power source so that the voltage applied to the shim 25 is controlled when the liquid is ejected. 49 is connected to a control device 51 connected to 49.

The oil-coated body 3 is grounded via, for example, a conveyor device and has a positive potential. Therefore, when a negative high-voltage DC high voltage (around −60 to −100 kV ) is applied to the shim 25 via the connector pin 45, the liquid supplied from the liquid supply port 29 is discharged into the discharge flow path groups 7A and 7B. Since they are charged instantly while passing through, charges of the same polarity repel each other. As a result, the liquid is atomized as fine particles having a uniform particle diameter and sprayed evenly from the tip of the nozzle head 27 toward the oil-coated body 3. The liquid diffusion width A on the oil-coated body 3 is spread evenly according to the amount of liquid sprayed.

  In addition, the control device 51 puts the discharge channel groups 7A and 7B in a state where a predetermined initial voltage PV that does not eject liquid from the discharge channel groups 7A and 7B is applied to the connector pin 45 in advance. Further, when the liquid is ejected from the nozzle, control is performed so as to apply a constant ejection voltage JV for ejecting the liquid.

  For example, as shown in FIG. 1, the shim 25 is controlled by the control device 51 so that the negative direct current high voltage is raised in advance from 0 (zero) kV to, for example, -40 kV as a constant initial voltage PV. Thus, -40 kV is always applied. Note that no liquid is ejected from the nozzle 5 at this voltage of −40 kV.

  Further, when the liquid is ejected from the nozzle 5, the voltage applied to the shim 25 is raised from −40 kV to, for example, −60 kV as a constant ejection voltage JV, as controlled by the control device 51. When this -60 kV is reached, liquid is ejected from the nozzle 5.

  At this time, the time required for the applied voltage to rise from −40 kV to −60 kV is only 10 msec (0.01 sec). The time required for the applied voltage to drop from -60 kV to -40 kV is only 10 msec (0.01 sec).

  In addition, a relief valve 53 is provided in the liquid supply line 9 between the liquid pump 15 and the liquid supply port 29 to keep the fluid pressure of the liquid supply line 9 and the liquid pump 15 constant. .

  The liquid motor 13, the electromagnetic valve 11, and the electromagnetic valve 12 are configured to be controlled by the control device 51.

  Next, the operation of the above configuration will be described.

  Referring to FIG. 2, the liquid in the liquid tank 17 to be oiled is sent from the liquid tank 17 to the liquid supply line 9 by the liquid pump 15 that is driven to rotate by the liquid motor 13. First, the solenoid valve 12 is opened with the controller 51 closed by the control device 51, is returned to the liquid tank 17 through the pipe line 10, and is circulated.

  Next, when the solenoid valve 11 is opened with the control device 51 closed, the liquid in the liquid supply line 9 is supplied to the liquid supply port 29. From this liquid supply port 29, the liquid is sprayed from the discharge ports 37 of the final flow paths of the plurality of discharge flow path groups 7 A and 7 B of the nozzle 5 toward the surface of the oil-coated body 3.

  Furthermore, referring to FIG. 2, the action when the liquid is sprayed from the nozzle 5 will be described in detail. The oil-coated body 3 is grounded and has a positive potential. Therefore, when a negative DC high voltage (around −60 to −100 kV) is applied to the shim 25 via the connector pin 45, the controller 51 turns on the electromagnetic valve 11, and the liquid passes through the liquid supply line 9. Then, the liquid supplied to the liquid supply port 29 is instantaneously charged while passing through the discharge flow path groups 7A and 7B of the shim 25, so that charges of the same polarity repel each other. It will be. As a result, the liquid is atomized as fine particles having a uniform particle diameter and sprayed evenly from the tip of the nozzle head 27 toward the oil-coated body 3. The liquid diffusion width A on the oil-coated body 3 is spread evenly according to the amount of liquid sprayed.

  On the other hand, when the control device 51 turns off the electromagnetic valve 11, the liquid spray from each discharge port 37 of the nozzle 5 is stopped, and the liquid in the liquid supply line 9 returns to the liquid tank 17 through the relief valve 53. Go.

  At this time, for example, when the oil-coated body 3 is conveyed by the conveyor device at a speed of, for example, 30 m / min or more, the oil-coated body 3 passes through the conveyor device in 1 to 2 seconds. The liquid sprayed from the nozzle 5 is applied to the surface of the oil body 3 within a short time of 1 to 2 seconds.

  In FIG. 1, when tsec, which is the time for applying the liquid to the oil-coated body 3, is 2 sec, the time from when the applied voltage is applied to the shim 25 until the end is increased from −40 kV to −60 kV. 10 msec (0.01 sec) required for the above and 10 msec (0.01 sec) required for the fall from −60 kV to −40 kV are combined, and it takes 2.02 sec in total.

  Therefore, when the above-mentioned oil-coated body 3 is intermittently conveyed by the conveyor device one after another, the liquid is intermittently sprayed from the nozzle 5 in accordance with the position of the oil-coated body 3 passing below the nozzle 5. Is done. At this time, since the time excluding tsec during which the liquid is sprayed onto the oil-coated body 3 is only 0.02 sec, the conveying speed of the oil-coated body 3 is reduced as in the prior art, There is no need to increase the interval between the oil-coated bodies 3 placed on the conveyor, the interval between the oil-coated bodies 3 placed on the conveyor device is reduced, and the oil-coated body 3 is conveyed. Even if the speed is increased, the liquid can be sufficiently followed and sprayed intermittently from the nozzle 5 at the position of the oil-coated body 3.

  As a result, the oil coating efficiency is improved and the productivity can be increased. Also, the amount of oil can be reduced.

  In addition, since the time for the applied voltage to drop is only 10 msec as described above, the liquid is not ejected as a fume as in the prior art, and the surrounding environment is not deteriorated.

It is a graph of time-applied voltage explaining the state of the chronologically applied voltage in the electrostatic oiling apparatus of embodiment of this invention. 1 is a schematic cross-sectional view of an electrostatic oiling device according to an embodiment of the present invention. (A) is the front view in which the discharge flow path group was formed in one surface of the shim of embodiment of this invention, (B) is the state which expanded the cross section along the oil sump and the discharge flow path group (C) is a partial cross-sectional view taken along the line III-III in (A). It is a schematic sectional drawing of the conventional electrostatic oiling apparatus. (A) is the front view in which the discharge flow path group was formed in one surface of the conventional shim, (B) is the longitudinal cross-sectional view of the state which expanded the cross section along the oil sump and the discharge flow path group. (C) is a fragmentary sectional view of an arrow VV line of (A). It is a time-applied voltage graph explaining the state of the chronologically applied voltage in the conventional electrostatic oil coating apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electrostatic type oil coating apparatus 3 Oil-coated body 5 Nozzle (blade type nozzle)
7, 7A, 7B Discharge flow path group 9 Liquid supply conduit 11 Electromagnetic valve 13 Liquid motor 15 Liquid pump 17 Liquid tank 19, 21 Nozzle head 23 Slit 25 Shim 27 Nozzle head 29 Liquid supply ports 31A, 31B Oil sumps 33, 35 Circular opening 37 Discharge port 39 Thick part 41 Projection part 43 Power supply connector 45 Connector pin (electrode)
47 Voltage Booster 49 Power Supply 51 Controller 53 Relief Valve

Claims (2)

A nozzle head (27) made of an electrically insulating material provided with a pair of first and second nozzle blades (19, 21) facing each other;
A shim (25) made of a conductive material disposed between the first and second nozzle blades (19, 21) ;
An electrode (43) for applying a voltage having a polarity opposite to that of the oil-coated body (3) to the shim (25);
A sump (31A, 31B) provided on one surface of the shim (25) and a plurality of discharge channel groups (7) extending downward, toward the oil-coated body (3) Discharges the oil-based liquid and has one flow channel groove toward the downstream side having a cross-sectional area corresponding to the application width (WA, WB) of the oil-based liquid in a direction orthogonal to the flow direction of the oil-based liquid. Discharged flow path group (7),
A liquid supply port communicating to supply the oil-based liquid in the discharge flow path group (7) and (29),
A plurality of discharge ports (37) communicating with the one flow channel groove provided at the lower end of the discharge flow channel group (7);
A nozzle (5) is constituted by a projecting portion (41) projecting downward in accordance with the width of the oil-coated body (3) between the plurality of discharge ports (37).
To control the supply amount of supplying oil-based liquid to the liquid supply port (29), not injecting the oil-based liquid from the pre-said discharge channel group to the electrode (45) (7) of the discharge port (37) The pressure is raised to a certain initial voltage (PV) and is constantly applied to the initial voltage (PV) , and then the oil-based liquid is further injected when the oil-based liquid is ejected from the discharge flow path group (7). The oil-based liquid is applied to the width of the oil- coated body (3 ) by applying a constant injection voltage (JV) to be sprayed, and then the initial voltage (PV) is equal to the time of the initial voltage (PV). And a control device that controls the lowering of the electrostatic oiling device.   2. The electrostatic oiling device according to claim 1, wherein the initial voltage is approximately -40 kV.

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