JP5027959B2 - Coating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coating device which can automatically supply a coating liquid correspondingly with the size of a work and stably atomize the coating liquid in succession, even in case the coating weight is extremely small, with the advantages that the manufacturing cost is low, the minute flow adjustment correspondingly with the work can be performed, and maintenance services are not necessary. <P>SOLUTION: This coating device comprises an air flow path 2, a cooling water flow path 3, a lubricant flow path 4 and a liquid volume adjustment part 11 which can adjust the inclusion volume of the coating liquid into the air. The liquid volume adjustment part 11 is formed of a flow path 15 consisting of a gap space 15a in a flat strip form and in such a way that the resistance of the flow path 15 extending from an inflow part 16 to an outflow part 17 is the lowest in the neighborhood of a coating liquid supply part. Besides, the air, first, flows near the coating liquid supply part and then, flows spreading widely in the width direction of the flow path 15 too, as the blow-off air volume becomes larger. Further, the flow velocity of the air flowing near the coating liquid supply part changes correspondingly with the blow-off air volume, resulting in the change of the differential pressure. Thus, the adjustment of the air inclusion volume into the coating liquid can be achieved. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to a coating apparatus that coats a workpiece with a coating liquid such as lubricating oil or cooling water used for cutting, and in particular, a very small amount of coating liquid can be stably applied to a small workpiece. The present invention relates to a coating apparatus for coating.

  Conventionally, in cutting of metal materials, synthetic resin materials, etc., coating liquid such as lubricating oil and cooling water is applied by air spray to prevent deformation due to lubrication and heat generation of the workpiece surface and tool protection. Has been done. In order to apply these coating liquids, a pump or the like is used to feed air and the coating liquid, and the coating liquid is mixed into the air, so that the blow hole at the tip of the blow channel provided in the processing blade itself or the processing blade The workpiece is spray-applied from a spray nozzle that is separately attached to the workpiece.

  By the way, in recent years, from the viewpoint of environmental problems and saving of oil, research and development has been carried out to discharge a very small amount of coating liquid corresponding to the size of a small workpiece and use it as a mist. Has been implemented. In other words, the work environment and the natural environment are deteriorated by applying an excessive amount of the coating liquid where it is sufficient to apply a very small amount of the coating liquid, and the coating liquid is wasted. Improvements are being made to prevent this. Here, in general, the coating solution is supplied in the minimum amount necessary by operating the flow control valve, etc., in order to obtain a good spray state by uniformly misting according to the size of the workpiece. Is done.

  However, the conventional coating apparatus has to readjust the flow rate adjusting valve in accordance with the size of each workpiece to be processed. In addition, in the case of using a feed pump, the number of reciprocations of the piston had to be adjusted again. For this reason, adjusting the amount of the coating liquid has been very troublesome and troublesome. In addition, forgetting the adjustment operation, the oil agent is used wastefully, or conversely, cutting is poor due to insufficient spraying.

  Furthermore, when supplying a very small amount of coating liquid with a small workpiece, the conventional liquid volume adjustment valve or a device that drops and supplies liquid droplets can be supplied with a very small valve. There wasn't. Further, the supply of the coating liquid is discontinuous and easily pulsates, and cannot be continuously supplied stably at a low cost.

In view of such circumstances, the present applicant, in Japanese Patent No. 3390831, branched from the main flow path consisting of a narrow groove in the middle of the air flow path for guiding the air supplied from the air supply source to the blowing side. Proposed a coating apparatus that is formed with a branch flow path composed of a plurality of narrow grooves and includes a flow rate adjusting unit that adjusts the flow rate of the coating liquid by changing the differential pressure in the coating liquid supply unit in accordance with the amount of blown air. . According to this coating device, it is possible to automatically obtain the oil mist concentration that matches the blown air amount according to the size of the work piece, so the oil amount adjustment valve is adjusted each time the work piece is different. It is possible to save the trouble of re-adjusting or adjusting the number of reciprocations of the piston of the supply pump. Also, even if the amount of oil applied is very small, a constant and uniform oil mist can always be supplied. And since the flow control part does not use parts such as valves at all, there is no fear of failure and it can operate stably.
Japanese Patent No. 3390831

  However, the coating apparatus described in the above-mentioned Japanese Patent No. 3390831 has a complicated structure in which the flow rate adjusting portion is composed of a main flow path and a plurality of branch flow paths, and both are formed by narrow grooves. Grooving was cumbersome and time-consuming, and the manufacturing cost was high. In addition, since the flow rate control unit is composed of a main flow path and a plurality of branch flow paths, the air flow rate flowing through this portion changes stepwise, and an arbitrary flow rate can be continuously stepped between them. It was not something that could flow. For this reason, the finer flow rate adjustment cannot be performed. Furthermore, since the flow rate adjusting part has a complicated structure in which the flow path is formed by a plurality of narrow grooves, maintenance is required.

  Therefore, the present invention can automatically supply the coating liquid according to the size of the workpiece, and can continuously and stably mist the coating liquid even when the coating amount is extremely small. Another object of the present invention is to provide a coating apparatus that can be manufactured at low cost, can be adjusted at a fine flow rate corresponding to the size of the workpiece by passing an arbitrary flow rate, and does not require maintenance.

  The coating apparatus according to claim 1 includes an air flow path that introduces air supplied from an air supply source and guides the air to a blowing side, a pressure applied to the coating liquid container, and a coating liquid supply provided in the middle of the air flow path. The coating liquid flow path for supplying the coating liquid in the coating liquid container to the coating liquid supply section by the differential pressure from the atmospheric pressure in the section and the air flow path, and supplying the coating liquid from the coating liquid container A liquid amount adjusting unit that adjusts the mixing amount of the coating liquid that is fed into the air and flows into the air flowing through the air flow path. The liquid amount adjusting unit is formed by a flow path composed of a flat strip-shaped gap space through which air flows, and a flow path resistance from the inflow part to the outflow part is applied in the width direction of the flow path. It is formed so as to be minimum in the vicinity of the liquid supply part, and the air first flows in the vicinity of the coating liquid supply part in the flow path, and the width direction of the flow path from the coating liquid supply part as the amount of blown air increases And the flow rate of the air flowing through the vicinity of the coating liquid supply unit corresponding to the amount of blown air changes, and the differential pressure changes, whereby the air of the coating liquid changes. It adjusts the amount of contamination.

  That is, in this coating apparatus, since the atmospheric pressure applied to the coating liquid container is larger than the atmospheric pressure in the coating liquid supply unit, the pressure difference is fed into the coating liquid supply unit and mixed into the air flowing through the air flow path. Here, the atmospheric pressure in the coating liquid supply unit depends on the flow velocity of the air flowing in the vicinity of the coating liquid supply unit, and varies depending on the flow path resistance, the pipe resistance, the viscosity of the coating liquid, etc. According to Bernoulli's theorem, the higher the flow velocity, the lower the pressure in this portion, and the differential pressure from the pressure applied to the coating solution container increases. Therefore, as the amount of blown air increases corresponding to the size of the workpiece, the flow rate of the air that flows near the coating liquid supply unit increases, and the differential pressure increases. An appropriate amount is automatically mixed according to the size of the workpiece.

  Next, when the workpiece is small and it is necessary to apply a very small amount of the coating liquid, the amount of blown air is correspondingly small. Here, the liquid amount adjusting unit is formed by a flow path composed of a flat strip-like gap space through which air flows, and air flows through a very narrow space, so that a large flow as a whole. Receives road resistance. On the other hand, the flow path resistance from the inflow part to the outflow part of the liquid amount adjusting unit is formed to be minimum in the vicinity of the coating liquid supply unit. This is because even if air is allowed to flow away from the coating liquid supply unit, the air pressure in the vicinity of the coating liquid supply unit is hardly affected and does not cause a differential pressure due to a drop. Is not pushed out. Therefore, the flow resistance in the vicinity of the coating liquid supply unit is intentionally minimized so that air flows at least in the vicinity of the coating liquid supply unit.

  For these reasons, the air is the portion of the liquid amount adjusting unit that has the smallest flow path resistance and is most likely to flow in the width direction of the flow path, and the coating liquid is pushed out of the coating liquid container. It flows in and flows through the portion near the supply unit. Thereby, the air flow is accelerated in this portion, and the flow velocity becomes large. As a result, a differential pressure sufficient to be sent out from the coating solution container to the coating solution supply unit against the weight of the coating solution is generated, and the coating solution is surely supplied in a small amount corresponding to a small amount of blown air into the fluid amount adjusting unit. , Will be mixed in the air.

  On the other hand, when the amount of blown air is large, not only in the vicinity of the coating liquid supply unit with the smallest flow path resistance in the width direction of the flow path, but also against the flow path resistance of the liquid amount adjusting unit corresponding to the amount of blown air. Thus, the flow also flows in a portion separated in the width direction from the coating liquid supply unit, that is, the flow cross-sectional area continuously increases, and a large amount of air equal to the amount of blown air flows in the liquid amount adjusting unit. At the same time, the flow velocity of the air in the vicinity of the coating solution supply unit increases, the differential pressure increases, and a large amount of coating solution corresponding to the amount of blown air is sent out to the coating solution supply unit.

  As described above, the flow path of the liquid amount adjusting unit is formed of a flat strip-like gap space in form, and thus has a constant flow cross-sectional area, but is formed in a narrow space and has a considerable flow rate. In order to generate the path resistance, the air first flows into the vicinity of the coating liquid supply section where the flow path resistance is the smallest and most likely to flow in the width direction of the flow path, that is, in the direction orthogonal to the flow direction. As the amount of blown air increases, the flow also expands to a portion that is separated from the coating liquid supply unit in the width direction of the flow path, and the flow cross-sectional area is continuously expanded steplessly. As a result, the coating solution is always stably and uniformly applied in any case where the amount of air mixed in is extremely small to a large amount.

  Next, in the coating apparatus according to the second aspect, the liquid amount adjusting unit is formed by a flow path composed of a gap space in which a very small amount of coating liquid can be mixed into the air, that is, the flow path is a very narrow gap. Since it is formed in a space, as in the first aspect, even a very small amount of coating liquid can always be supplied stably in a constant amount.

  In the coating apparatus of the third aspect, in particular, the flow path length from the air inflow portion to the outflow portion in the liquid amount adjusting portion is formed to be minimum in the vicinity of the coating liquid supply portion. Specifically, for example, a recess having a trapezoidal opening can be engraved in a wall material, and the opening can be closed with another wall material or the like to form a flat band plate-like gap space. The two trapezoidal parallel sides flow along these sides. Thereby, the air in the liquid amount adjusting unit first flows in the vicinity of the application liquid supply unit of the shortest path having the smallest flow path resistance due to the short flow path length, and as the amount of air flowing through increases thereafter It also flows through other flow path lengths.

  According to the first aspect of the present invention, since the liquid amount adjusting unit is provided, the mist amount of the coating liquid in the air also changes in proportion to the amount of blown air corresponding to the size of the workpiece. Even if the coating amount of the coating solution is extremely small, the mist amount of the coating solution in the air is always constant and uniform. As a result, an optimum application amount is blown out to the workpiece without excess or deficiency, so that a good lubrication state and cooling state can be obtained, and work by spraying an excessive amount of coating liquid mist such as lubricating oil It can prevent environmental degradation. Further, since the liquid amount adjusting unit does not use any parts such as a valve, the application amount does not vary between the application devices, and a stable device without failure can be provided. Furthermore, even if the size of the workpiece is different, it is possible to automatically obtain a mist concentration that matches the amount of blown air, so that the liquid volume adjustment valve can be readjusted every time the workpiece is different, or the supply pump The trouble of adjusting the number of reciprocations of the piston can be saved.

  In particular, since the liquid amount adjusting part is formed by a flow path including a flat strip-like gap space through which air flows, the structure can be manufactured easily and inexpensively and can be reduced in weight. In addition, as the amount of blown air increases, the air in the liquid amount adjusting section flows from the vicinity of the coating liquid supply section to the portion that is separated in the width direction of the flow path, and the flow cross-sectional area continuously increases. Thus, it is possible to automatically and finely supply a coating liquid having an amount corresponding to the size of the workpiece. Furthermore, since it is formed only with a simple flat strip plate-like channel, no maintenance is required.

  Next, the second aspect of the invention has the same effect as that of the first aspect because the liquid amount adjusting portion is formed by a flow path including a gap space in which a very small amount of coating liquid can be mixed into the air. .

  In the invention of claim 3, in particular, since the channel length from the air inflow portion to the outflow portion in the liquid amount adjusting portion is formed to be the minimum in the vicinity of the coating liquid supply portion, the liquid amount adjusting portion has a simple structure. Among these, the flow path resistance can be minimized in the vicinity of the coating liquid supply unit.

  Hereinafter, the coating apparatus of embodiment of this invention is demonstrated based on FIG.1 and FIG.2. Here, FIG. 1 is a schematic view showing a coating apparatus according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line AA in FIG. In the present embodiment, an example in which lubricating oil and cooling water are used as the coating liquid is shown.

  In FIG. 1, a coating apparatus 1 delivers air A sent from an air compressor 21 to a blowing nozzle 7 or a blowing hole 8a of a processing blade 8 and a cooling water pressure tank 5 serving as a coating liquid container. Lubricating oil that feeds the lubricating water O sent from the cooling water flow path 3 that feeds the cooled cooling water W to a cooling water supply unit 18 to be described later and the lubricating oil pressure tank 6 as another coating liquid container The flow path 4 and the liquid amount adjusting unit 11 that adjusts the mixing amount of the cooling water W and the lubricating oil O mixed in the air A flowing through the air flow path 2 are main components.

  The air A sent from the air compressor 21 is opened and closed by an air opening / closing valve 22 such as an electromagnetic valve, flows into the air passage 2 with the air opening / closing valve 22 open, and flows through the liquid amount adjusting unit 11. The air is blown toward the workpiece (not shown) from the blow nozzle 8 or the blow hole 8a of the processing blade 8, and partly branches to the pressure tank side at the branch portion 2a, and further to the cooling water pressure tank 5 at the branch portion 2b. It branches to the lubricating oil pressure tank 6 and pressurizes the inside of these pressure tanks. A check valve 23 and a check valve 24 are provided between the branch portion 2b and the cooling water pressure tank 5, and between the branch portion 2b and the lubricating oil pressure tank 6, respectively, to prevent backflow.

  A cooling water flow path 3 is provided between the cooling water pressure tank 5 and the liquid amount adjusting unit 11, and a cooling water opening / closing valve 25 for controlling the flow of the cooling water W and the cooling water opening / closing are provided in the middle of the flow path. A concentration adjusting valve 26 for adjusting the flow rate of the cooling water W that has passed through the valve 25 to roughly adjust the concentration of the cooling water W in the air A is provided. Here, the concentration adjusting valve 26 roughly adjusts the amount of the cooling water W mixed in the air A, and adjusts the amount of the cooling water W that finely adjusts the minute amount of the cooling water W corresponding to the blown air amount with high accuracy. Different from the part 11. Similarly, a lubricating oil flow path 4 is provided between the lubricating oil pressure tank 6 and the liquid amount adjusting unit 11, and in the middle of the flow path, a lubricating oil opening / closing valve 27 that controls the flow of the lubricating oil O, A concentration adjusting valve 28 for adjusting the concentration of the lubricating oil O in the air A by adjusting the flow rate of the lubricating oil O that has passed through the lubricating oil opening / closing valve 27 is provided.

  Next, as shown in FIG. 2, the liquid amount adjusting unit 11, which is a feature of the present invention, is provided between a pair of a first wall member 12 and a second wall member 13 made of steel, synthetic resin, or the like. In this embodiment, the concave portion 14 is formed on the first wall member 12 side, the opening 14a is closed by the second wall member 13, and the flat strip plate shape is formed by the gap space 15a formed therebetween. The flow path 15 is formed. More specifically, the concave portion 14 which is the main body portion of the liquid amount adjusting portion 11, the inflow portion 16 into which the air A sent from the air compressor 21 flows, and the air A in the concave portion 14 is blown out from the nozzle 7 or the processing blade. 8 and the cooling water supply part which the cooling water W sent out through the cooling water flow path 3 from the cooling water pressure tank 5 flows in from the supply opening 18a, and is supplied. 18, and the lubricating oil O sent from the lubricating oil pressure tank 6 through the lubricating oil flow path 4 flows into the supply opening 19 a and is supplied to the lubricating oil supply unit 19.

  As for the recessed part 14 of the liquid quantity adjustment | control part 11, the opening 14a is formed in the reverse trapezoid shape, as shown in FIG. The inflow portion 16 is formed along a trapezoidal inclined surface, and air A flows into the recess 14 from an inflow opening 16a formed in the entire inclined surface. The outflow portion 17 is formed along a trapezoidal inclined surface, and air A flows out of the recess 14 from an outflow opening 17a formed on the entire inclined surface. As shown in FIG. 2, the recess 14 is formed in a flat strip plate-like channel 15 having a very small depth d, a large width w, and a very small gap space 15a. Yes. In addition, since the dimension of the flow path 15 of the liquid amount adjusting unit 11 varies depending on the size of the coating apparatus 1, the material of the coating liquid, the properties, and the like, it is preferable to find and set an optimum value through trial manufacture and trial. Thereby, when the air A flows in the recessed part 14 toward the outflow part 17 from the inflow part 16, it will receive large flow path resistance from the wall surface of the 1st wall material 12 and the 2nd wall material 13, and the flow path The resistance increases almost in proportion to the flow path length l.

  Since the concave portion 14 of the liquid amount adjusting portion 11 has such a structure, the air A flows into the concave portion 14 from the inflow opening 16a of the inflow portion 16, and then flows in parallel along the trapezoidal upper and lower sides. It flows out of the recess 14 from the outflow opening 17 a of the outflow portion 17. For this reason, when the air A flows through the recess 14, the longer the flow path, the larger the flow resistance, and the easier it is to flow to the tip of the inflow section 16 due to the inertia of the fluid. 3A is a streamline in the vicinity of the cooling water supply unit 18 and the lubricating oil supply unit 19 that are at the tip side of the inflow portion 16 and have the smallest flow path length l and the smallest flow path resistance, as shown in FIG. It will go to the outflow opening 17a through the part of (a).

  On the other hand, when the air flow rate is slightly high, the flow also flows to the portion of the streamline B shown in FIG. 3 (b) where the flow path length l is slightly large and the flow path resistance is slightly large. That is, the flow rate that cannot be passed through only the streamline A part of the air A flows to the streamline B part, and the air A has a part where the flow cross-sectional area is increased by adding the streamline B to the streamline A. It will flow. When the air flow rate is further increased, the air flow also flows through a portion of a streamline C having a larger flow path length l and a larger flow path resistance shown in FIG. That is, the flow rate that cannot be passed through only the streamline a and streamline b of the air A flows into the streamline c part, and the air A flows into the streamline a part and the streamline b part. As a result, the flow cross-sectional area further increases. Hereinafter, as the air flow rate further increases, the portion of the streamline through which the air A flows increases in order, and finally, the air A becomes a gap space 15a in the recess 14 as shown in FIG. Will flow through. On the other hand, as the air flow rate increases, at the same time, the flow velocity of the air flowing through the portion of the streamline A in the vicinity of the cooling water supply unit 18 and the lubricating oil supply unit 19 also increases.

  Here, the flow cross-sectional area expands and changes naturally and freely according to the air flow rate without any operation from the outside. That is, in appearance, the flow cross-sectional area of the recess 14 has a width w and a depth d, but the gap space 15a is very small and receives a great flow resistance when the air A flows. In practice, the cross-sectional area of the flow freely expands and changes freely from the portion of the streamline i where the flow resistance is the smallest and easy to flow to the other streamline c portion as the air flow rate increases, and The structure is continuously variable in a stepless manner.

  In addition, although the depth d of the recessed part 14 of the liquid quantity adjustment | control part 11 is formed very small, the flow path in the inflow part 16 and the outflow part 17 is not restricted to this magnitude | size and shape.

Next, the flow and flow rate of the air A, the cooling water W, and the lubricating oil O in the coating apparatus 1 configured as described above will be described.
Now, the air pressure p1 applied to the cooling water pressure tank 5 is a constant value substantially the same as the compressed air pressure of the air compressor 21, whereas the air pressure p2 in the cooling water supply unit 18 in the recess 14 of the liquid amount adjusting unit 11 is As long as the air A flows through this portion, it becomes lower than the atmospheric pressure at the peripheral portion, and changes according to the flow velocity of the air A flowing through this portion according to Bernoulli's theorem, and becomes smaller as the flow velocity increases. Accordingly, p1> p2, and due to the differential pressure, the cooling water W in the cooling water pressure tank 5 is pushed up into the cooling water flow path 3 and sent out from the supply opening 18a into the cooling water supply unit 18, and the air Into A. Similarly, the lubricating oil O in the lubricating oil pressure tank 6 is pushed up from the lubricating oil pressure tank 6 into the lubricating oil flow path 4 and sent out into the lubricating oil supply unit 19 from the supply opening 19a.

  Therefore, first, when the workpiece is small, the air A is squeezed by the blowing nozzle 7 or the blowing hole 8a of the machining blade 8, and a very small amount is blown out. The flow rate that flows is the same very small amount. For this reason, as shown in FIG. 3A, the air A sent from the air compressor 21 and sent into the gap space 15a of the liquid amount adjusting unit 11 flows along the trapezoidal inclined surface in the inflow unit 16. From the opening 16 a, the flow resistance is the smallest and the flow of the cooling water supply part 18 and the lubricating oil supply part 19 in the vicinity of the lubricating oil supply part 19 flow most easily in the flow path 15, and flow toward the outflow part 17. . At this time, since the flow rate of the air A flowing in the streamline part A in the flow path 15 and flowing in the vicinity of the cooling water supply unit 18 and the lubricating oil supply unit 19 is small and the flow velocity is small, the cooling water supply unit 18 and the lubricating oil are lubricated. The decrease in the pressure p2 in the oil supply unit 19 is small. Therefore, the differential pressure between the atmospheric pressure p2 and the atmospheric pressure p1 applied to the pressure tank is small. However, since the air A has a flow velocity corresponding to the flow cross-sectional area of the streamline A, the differential pressure sends the cooling water W in the cooling water pressure tank 5 to the cooling water supply unit 18, Further, the size is sufficient to send the lubricating oil O in the lubricating oil pressure tank 6 to the lubricating oil supply unit 19. As a result, a very small amount of cooling water W flows from the cooling water pressure tank 5 through the cooling water flow path 3 and is pushed out into the cooling water supply unit 18, and a very small amount of lubrication from the lubricating oil pressure tank 6. Oil O flows through the lubricating oil flow path 4 and is pushed out into the lubricating oil supply unit 19 and mixed into the air A in the flow path 15.

  That is, when the workpiece is small and the amount of blown air is extremely small, the cooling water W and the lubricating oil O mixed in the air A are also extremely small. Therefore, even when the work piece is small and the cooling water W and the lubricating oil O are misted and discharged from the blow nozzle 7 or the blow hole 8a of the work blade 8 in a very small amount, the liquid amount is adjusted. An appropriate amount corresponding to the size of the workpiece is reliably supplied into the air A by the part 11 and mixed and then blown out.

  Next, when the workpiece is a little large, a little larger amount of air A is blown out from the blowing nozzle 7 and the blowing hole 8a of the machining blade 8 accordingly. On the other hand, as shown in FIG. 3 (b), the air A in the liquid amount adjusting unit 11 first flows into the streamline a part, and the amount that cannot be handled only by this part is in the adjacent streamline b part. It will flow.

  At this time, as the amount of air flowing through the liquid amount adjusting unit 11 increases, the flow velocity in the portion of the streamline A in the vicinity of the cooling water supply unit 18 and the lubricating oil supply unit 19 also increases. In connection with this, the fall of the atmospheric | air pressure p2 in the cooling water supply part 18 and the lubricating oil supply part 19 becomes large. As a result, the differential pressure between the atmospheric pressure p1 applied to the cooling water pressure tank 5 and the lubricating oil pressure tank 6 and the atmospheric pressure p2 in the cooling water supply unit 18 and the lubricating oil supply unit 19 is increased. The amount of cooling water W sent to the cooling water supply unit 18 and the amount of lubricating oil O sent from the lubricating oil pressure tank 6 to the lubricating oil supply unit 19 increase corresponding to the amount of blown air. An amount of coating liquid corresponding to the size is supplied to the flow path 15.

  Next, when the workpiece is larger, a larger amount of air A is blown out from the blow nozzle 7 and the blow hole 8a of the work blade 8 accordingly. On the other hand, as shown in FIG. 1, the air A in the liquid amount adjusting unit 11 first flows into the streamline i part and further into the streamline b part, and the amount that cannot be handled only by this part is adjacent. It will also flow to the streamlined part.

  At this time, as the flow rate of the air A flowing through the liquid amount adjusting unit 11 further increases, the flow velocity in the vicinity of the cooling water supply unit 18 and the lubricating oil supply unit 19 further increases. Along with this, the decrease in the pressure p2 in the cooling water supply unit 18 and the lubricating oil supply unit 19 is further increased. As a result, the differential pressure between the air pressure p1 applied to the cooling water pressure tank 5 and the lubricating oil pressure tank 6 and the air pressure p2 in the cooling water supply unit 18 and the lubricating oil supply unit 19 is further expanded. The amount of cooling water W sent from the cooling water supply unit 18 to the cooling water supply unit 18 and the amount of lubricating oil O sent from the lubricating oil pressure tank 6 to the lubricating oil supply unit 19 increase corresponding to the amount of blown air. An amount of the coating liquid corresponding to the size of is supplied to the flow path 15.

  Hereinafter, as the size of the workpiece further increases, the amount of blown air increases, and the air A finally flows through the entire recess 14 as shown in FIG. At the same time, the flow rate of the air A flowing through the stream line a is maximized, the differential pressure is also maximized, and a large amount of coating liquid is supplied to the flow path 15.

Next, the operation of the coating apparatus 1 according to this embodiment will be described.
In the coating apparatus 1, the atmospheric pressure p <b> 1 applied to the cooling water pressure tank 5 and the lubricating oil pressure tank 6 is larger than the atmospheric pressure p <b> 2 in the cooling water supply unit 18 and the lubricating oil supply unit 19. Are respectively fed into the cooling water supply unit 18 and the lubricating oil supply unit 19 and mixed into the air A flowing through the flow path 15. The mixing amount is adjusted by the liquid amount adjusting unit 11, and an appropriate amount of the coating liquid is automatically mixed according to the size of the workpiece.

  Here, the liquid amount adjusting unit 11 of the coating apparatus 1 is formed by a flow path 15 including a flat strip-like gap space 15 a, and the air A passes through a very narrow flow path 15 of the liquid amount adjusting unit 11. Since it flows, it receives considerable flow resistance. On the other hand, since the flow path length l in the liquid volume adjusting unit 11 continuously changes in the width direction of the flow path 15, the air A in the liquid volume adjusting unit 11 flows first with the shortest flow path length l. A portion of the stream line A in the vicinity of the cooling water supply unit 18 and the lubricating oil supply unit 19 having the smallest path resistance flows, and the flow line b, stream line c,. It flows also to the part to a long part and the flow path length l. For this reason, when the amount of blown air increases corresponding to the size of the workpiece, the flow rate and flow velocity of the air A flowing through the liquid amount adjusting unit 11 increase, and the vicinity of the cooling water supply unit 18 and the lubricating oil supply unit 19 And the air pressure p2 in the cooling water supply unit 18 and the lubricating oil supply unit 19 further decreases. Accordingly, the differential pressure between the atmospheric pressure p2 and the atmospheric pressure p1 applied to the cooling water pressure tank 5 and the lubricating oil pressure tank 6 with a constant magnitude increases, and a large amount of coating liquid becomes the cooling water pressure tank 5 and the lubricating oil. It is fed from the pressure tank 6 to the cooling water supply unit 18 and the lubricating oil supply unit 19 and is mixed into the air A in the flow path 15.

  As a result, the cooling water W and the lubricating oil O are supplied in an arbitrary amount into the flow path 15 in a stepless manner according to the amount of blown air corresponding to the size of the workpiece. At the same time, even if the application amount of these application liquids is extremely small, the air A in the liquid amount adjustment unit 11 is supplied to the cooling water supply unit 18 and the lubricating oil supply unit 19 in accordance with the size of the workpiece. Since it concentrates in the vicinity and flows through the narrow flow path 15 at a predetermined flow velocity, a required differential pressure is generated, and the corresponding minute amount of coating liquid is reliably and stably stabilized in the cooling water supply unit 18 and the lubricating oil. The amount of mist of the coating liquid in the air A sent out and blown out to the supply unit 19 is always constant and uniform. As a result, the optimum amount of the cooling water W and the lubricating oil O is always blown out to the workpiece without excess or deficiency, so that the workpiece can have a good lubrication state and cooling state, and an excessive amount of coating liquid can be obtained. The work environment is prevented from deteriorating due to the diffusion of mist. Further, since the liquid amount adjusting unit 11 does not use any parts such as a valve, there is no variation in the application amount between the application devices 1. And the stable coating device 1 without a failure can be provided. Furthermore, even if the size of the workpiece is different, it is possible to automatically obtain the mist concentration of the coating liquid that matches the blown air volume. The trouble of re-adjusting the number of reciprocations of the piston of the supply pump becomes unnecessary.

  In particular, the liquid amount adjusting unit 11 is formed by a flow path 15 including a flat strip-shaped gap space 15a through which air A flows, and the flow path 15 is formed in a recess 14 having a trapezoidal opening 14a. Since the flow path length l from the inflow section 16 to the outflow section 17 is continuously enlarged in the width direction of the flow path 15, the structure is simple, and the recess having a trapezoidal opening 14a in a steel material or the like. It is possible to easily and inexpensively manufacture and reduce the weight simply by forming 14. Further, as the amount of blown air increases, the air A in the liquid amount adjusting unit 11 expands from the vicinity of the coating liquid supply unit to the portion separated in the width direction of the flow path 15 and the flow cross-sectional area is continuous. Therefore, the amount of coating liquid corresponding to the size of the workpiece can be automatically and finely supplied. Furthermore, since it is formed only by the flow path 15 composed of a simple flat strip-like gap space 15a, it is stable without a failure and does not require maintenance.

  By the way, in the said embodiment, although the cooling water W and the lubricating oil O are used as a coating liquid, you may use only any one of them. In addition, although the cooling water pressure tank 5 and the lubricating oil pressure tank 6 are installed in the position shown in FIG. 1, it cannot be overemphasized that the position may mutually be replaced. Further, the coating liquid is not limited to the cooling water W and the lubricating oil O.

  Furthermore, the opening 14a of the concave portion 14 of the liquid amount adjusting unit 11 of the above embodiment is formed in a trapezoidal shape having inclined sides on both sides, but is formed in a trapezoidal shape having an inclined side on either the left or right side. Also good. Alternatively, the left and right inclined portions are not linear, and one or both of the inclined portions may be formed in an arc shape or the like as shown in FIG. In this case, the air A flows through the inflow portion 16 formed in an arc shape or the like, and easily flows into the streamline a portion in the gap space 15a due to the inertia of the fluid. Moreover, the opening 14a of the recessed part 14 is not restricted to these trapezoidal shapes.

  In the liquid amount adjusting unit 11 of the above embodiment, the air A flows from above to the inflow portion 16 along the trapezoidal inclined side, and first flows from the lower end to the portion of the streamline A, and flows through this portion. However, the present invention is not limited to this. For example, as shown in FIG. 5, the air A sent from the air compressor 21 is streamlined. It is possible to immediately flow into this part and flow out linearly from the opposite side.

  Further, the liquid amount adjusting unit 11 is formed in a trapezoidal shape, and the flow path length l of each stream line in the width direction of the flow path 15 makes the portion of the stream line A in the vicinity of the coating liquid supply unit the shortest, Hereinafter, it is formed to be successively longer as it is separated from the coating liquid supply section in the width direction of the flow path 15, but is not limited to this when the present invention is implemented. If the part a is the shortest, the flow path length l of the other part does not necessarily have to be successively increased as the distance from the coating liquid supply unit in the width direction of the flow path 15 increases.

  Furthermore, the recess 14 of the liquid amount adjusting unit 11 of the above embodiment has a bottom surface formed in a plane having a constant depth d, but is not limited thereto. The flow path resistance from the inflow part 16 to the outflow part 17 may be continuously different in the width direction of the flow path 15 by forming on an inclined surface inclined in the width direction.

  In addition, the liquid amount adjusting unit 11 of the above embodiment is formed in the flow path 15 by engraving the concave portion 14 on the first wall material 12 side, but is not limited to this. It is good also as what forms a recessed part in the position which mutually opposes both in the material 12 and the 2nd wall material 13, and assembles the 1st wall material 12 and the 2nd wall material 13, and is formed in the one flow path 15. .

  In addition, the liquid amount adjusting unit 11, the cooling water pressure tank 5, and the lubricating oil pressure tank 6 of the above embodiment may be provided in the main body of the coating apparatus 1, or may be provided outside the main body as a separate body. .

It is a lineblock diagram showing the whole coating device of an embodiment of the present invention. It is sectional drawing by the AA cutting line of FIG. Fig. 2 is an internal structural diagram showing the flow path in the liquid volume control unit of Fig. 1, where (a) shows a very small amount of air, (b) shows a medium amount, and (c) shows a case of a large amount. Show. It is an internal structure figure which shows the modification of the liquid quantity adjustment | control part of FIG. It is an internal structure figure which shows the liquid quantity adjustment | control part different from FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Application | coating apparatus 2 Air flow path 3 Cooling water flow path 4 Lubricating oil flow path 5 Cooling water pressure tank 6 Lubricating oil pressure tank 11 Liquid quantity adjustment part 14 Recess 15 Flow path 15a Crevice space 18 Cooling water supply part 19 Lubricating oil supply part 21 Air compressor A Air W Cooling water O Lubricating oil l Flow path length b, b, c Streamline p1 Pressure applied to pressure tank p2 Pressure at coating liquid supply section

Claims (3)

An air flow path for introducing air fed from an air supply source and leading it to the blowout side;
A coating liquid flow path for feeding the coating liquid in the coating liquid container to the coating liquid supply section by a differential pressure between the atmospheric pressure applied to the coating liquid container and the atmospheric pressure in the coating liquid supply section provided in the middle of the air flow path; ,
A liquid amount adjusting unit that is provided in the middle of the air flow path and adjusts the amount of the coating liquid that is fed from the coating liquid container to the coating liquid supply unit and mixed into the air flowing through the air flow path And
The liquid amount adjusting unit is formed by a flow path composed of a flat strip plate-shaped gap space through which air flows, and a flow resistance from the inflow part to the outflow part is supplied in the width direction of the flow path. In the flow path, the air first flows in the vicinity of the coating liquid supply section, and is separated from the coating liquid supply section in the width direction of the flow path as the blowing amount increases. And the flow rate of the air flowing through the vicinity of the coating liquid supply unit corresponding to the amount of blown air changes and the differential pressure changes, so that the coating liquid flows into the air. A coating apparatus that adjusts the amount of mixing.   The coating apparatus according to claim 1, wherein the liquid amount adjusting unit is formed by a flow path including a gap space in which a very small amount of coating liquid can be mixed into the air.   3. The coating apparatus according to claim 1, wherein the liquid amount adjusting unit is formed to have a minimum flow path length from the inflow portion to the outflow portion in the vicinity of the coating liquid supply portion.

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