JP2019018156A - Film coating device and film coating method - Google Patents

Abstract

To provide a film coating device and a film coating method having no fear of dropping a coating liquid on a head part when coating a lubrication film at the head part of the piston of a compressor.SOLUTION: A film coating device (100) coating a coating liquid (40) on the outer peripheral surface (2) of the columnar head part of a piston (1) by rotating the piston for a compressor in a horizontal state includes: a rotation support means (10) supporting the piston to be horizontal and rotating the piston; a blade (20) inclining a cutting edge (23) having a flat blade shape downward toward a piston side; and a supply nozzle (30) discharging the coating liquid on the upper surface (21) of the blade.SELECTED DRAWING: Figure 2

Description

  The present disclosure relates to a lubricating film coating apparatus and a coating method for a cylindrical part, in particular, a cylindrical part (hereinafter also referred to as a head part) of a piston of a compressor.

  In a compressor for an air conditioner, a piston reciprocates in a cylinder bore of a cylinder block to compress a refrigerant (see, for example, Patent Document 1). Generally, a polytetrafluoroethylene (PTFE) coating is applied to the head portion of the piston. It is well known that the PTFE coating on the head portion is performed by electrostatic painting or spray painting.

  However, the electrostatic coating requires a large apparatus, and the spray coating has a problem that the coating liquid sprayed out of the piston is wasted and both of them are costly.

  In order to solve such a problem, a so-called dispenser coating method in which a predetermined amount of coating liquid is dropped onto the head portion of the piston and the coating liquid is spread over the entire cylindrical surface by a blade that is brought close to the piston while rotating the piston. (For example, refer to Patent Document 2 or 3).

  In the apparatus described in Patent Document 2, the piston is rotatably held, and the coating liquid is dropped from the nozzle disposed on the piston while rotating the piston to the head portion of the piston, and at the same time, integrally formed with the nozzle. A film having a constant film thickness is formed on the entire outer peripheral surface of the head portion by the blade (spreading means).

  In the apparatus described in Patent Document 3, the piston is rotatably held, and paint is dropped on the outer peripheral surface of the piston head portion from the nozzle arranged on the piston while rotating the piston. A film is formed on the head portion by a blade (spreading means) formed separately.

JP 2017-66913 A JP 2003-33709 A JP 2002-219393 A

  However, even if the discharge of the coating liquid is stopped, in the apparatuses described in Patent Documents 2 and 3, since the nozzle discharge port is located above the head portion, the paint remaining in the vicinity of the nozzle discharge port There was a possibility that the liquid might drip onto the head part. When such dripping of the coating liquid occurs, an additional step for removing it is necessary.

  Further, when the spreading means is integrated with the nozzle as in the apparatus described in Patent Document 2, it is necessary to set a dedicated nozzle as needed in a design with different paint specifications and film thicknesses.

  Therefore, an object of the present disclosure is to provide a film coating apparatus and a coating method that do not cause the coating liquid to drop onto the head part when a lubricant film is coated on the head part of the piston of the compressor.

  As a result of intensive studies, the present inventors have found that the above problem can be solved by discharging the coating liquid onto a blade in a state where a flat blade-shaped cutting edge is inclined downward toward the piston side. Completed. That is, the film coating apparatus according to the present invention is a film coating apparatus in which a piston for a compressor is rotated in a horizontal state so that a coating liquid is applied to an outer peripheral surface of a columnar head portion of the piston. A rotation support means for supporting and rotating the blade, a blade having a flat blade-like cutting edge inclined downward toward the piston side, and a supply nozzle for discharging the coating liquid onto the upper surface of the blade. It is characterized by.

  In the film coating apparatus according to the present invention, by moving the blade in the horizontal direction, the blade edge of the blade is brought close to a predetermined distance to the outer peripheral surface of the head portion, or from the outer peripheral surface of the head portion. It is preferable to further have blade moving means for moving the blade edge away. Since the setting to the predetermined distance is possible only by controlling the horizontal movement of the blade, the structure of the coating apparatus can be simplified.

  In the film coating apparatus according to the present invention, it is preferable that the blade has a bank portion at both ends sandwiching the blade edge. The paint liquid can be prevented from flowing down to both sides of the blade.

  In the film coating apparatus according to the present invention, it is included that the upper surface of the blade has a downwardly curved shape or a straight shape when viewed from a surface crossing the head portion. .

  In the film coating apparatus according to the present invention, it is preferable that the blade has a damming portion on the opposite side of the blade edge to prevent the coating liquid from flowing upward. It is possible to prevent the coating liquid from moving above the nozzle discharge port.

  In the film coating apparatus according to the present invention, it is preferable that the upper surface of the blade has a liquid repellent treatment surface. The paint liquid can easily flow in the direction of the blade tip, and the discharge amount of the paint liquid can be easily controlled. Further, the upper surface of the blade can be made difficult to get dirty.

  In the film coating apparatus according to the present invention, it is preferable that the upper surface of the blade has a liquid storage portion along the blade edge of the blade. It is possible to prevent the coating liquid from spilling from the tip of the blade.

  In the film coating apparatus according to the present invention, it is preferable that an inclination angle of the blade in the region of the liquid storage part is smaller than an inclination angle of another region. It is possible to further prevent the coating liquid from spilling from the tip of the blade.

  In the film coating apparatus according to the present invention, it is preferable that an end surface of the blade edge of the blade has a liquid repellent surface. By making the coating liquid difficult to adhere to the end face of the blade tip, it is possible to further prevent the coating liquid from spilling from the tip of the blade. In addition, it is possible to make it easy to run out of liquid.

  In the coating coating apparatus according to the present invention, it is preferable that the supply nozzle does not interfere with the piston, and the discharge port of the supply nozzle is fixed at a position away from the outer peripheral surface of the piston by a predetermined distance. Since the structure moves only the blade, the structure of the apparatus can be simplified and the control is facilitated.

  In the film coating apparatus according to the present invention, it is preferable that the blade moving means moves the supply nozzle together with the blade. By always keeping the upper surface of the blade close to the discharge port of the supply nozzle, it is possible to prevent air from being caught in the coating liquid in the vicinity of the discharge port of the supply nozzle. Further, the structure of the apparatus can be simplified and the control becomes easy.

  In the coating coating apparatus according to the present invention, the outer peripheral surface of the head portion has a circulating groove portion, and the upper surface of the blade tip portion of the blade is in a position approaching the groove portion so that the coating liquid flows into the groove portion. It is preferable to have a protrusion that inhibits the above. Application to the groove portion of the outer peripheral surface of the head portion can be omitted.

  In the film coating apparatus according to the present invention, it is preferable that the supply nozzle has a nozzle shape that does not discharge the coating liquid upstream of the protrusion. The application to the groove portion of the outer peripheral surface of the head portion can be prevented with higher accuracy.

  The film coating method according to the present invention is a film coating method in which a coating liquid is applied to the outer peripheral surface of the columnar head portion of the piston using the film coating apparatus according to the present invention. The step of horizontally supporting the piston, the step of rotating the piston by the rotation support means, and the step of causing the blade edge of the blade to approach the outer peripheral surface of the head portion by a predetermined distance by the blade moving means. And discharging the coating liquid from the supply nozzle onto the upper surface of the blade, applying the coating liquid to the outer peripheral surface of the head portion, and the blade moving means from the outer peripheral surface of the head portion. And a step of moving the blade edge away.

  According to the present disclosure, it is possible to provide a film coating apparatus and a coating method in which there is no possibility that the coating liquid drops on the head part when the lubricating film is coated on the head part of the piston of the compressor.

It is a schematic perspective view of the film coating apparatus which concerns on this embodiment. It is explanatory drawing of a braid | blade and a supply nozzle, (a) is the schematic perspective view seen from diagonally upward, (b) is the schematic of the discharge port which looked at the supply nozzle from the lower end side, (c) The 1st of the discharge port It is the schematic of a modification, (d) The schematic of the 2nd modification of an ejection opening, (e) The schematic of the 3rd modification of an ejection opening. FIG. 2 is a sectional view taken along line AA in FIG. 1. It is sectional drawing which shows the 1st modification of FIG. It is sectional drawing which shows the 2nd modification of FIG. It is the schematic which looked at the upper surface of the braid | blade. It is sectional drawing which shows the 3rd modification of FIG. It is sectional drawing which shows the 4th modification of FIG. It is a schematic plan view of the film coating apparatus which concerns on this embodiment, and the supply nozzle is not illustrated. FIG. 10 is an enlarged view of a portion B in FIG. 9. FIG. 11 is a sectional view taken along line CC in FIG. 10. FIG. 11 is a sectional view taken along line D-D in FIG. 10.

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. The embodiments described below are examples of the present invention, and the present invention is not limited to the following embodiments. In the present specification and drawings, the same reference numerals denote the same components. Various modifications may be made as long as the effects of the present invention are achieved.

  As shown in FIG. 1, the coating coating apparatus 100 according to the present embodiment rotates the piston 1 for the compressor in a horizontal state and applies the coating liquid 40 to the outer peripheral surface 2 of the columnar head portion of the piston 1. In the film coating apparatus, the rotation support means 10 that horizontally supports and rotates the piston 1, the blade 20 in a state where the flat blade-shaped cutting edge is inclined downward toward the piston 1, and the coating liquid is applied to the blade 20. And a supply nozzle 30 for discharging to the upper surface 21.

  The type of the compressor is, for example, a swash plate type compressor, and may be either a variable capacity type or a fixed capacity type. The piston 1 shown in FIG. 1 is a semi-finished product in which two pistons are connected to each other on the side opposite to the head portion, and finally is separated after applying a lubricating film. Since the lubricating coating is applied when the two pistons are connected, production efficiency can be increased.

  The rotation support means 10 includes a pair of support members 11 that support the rotation centers of the side surfaces of both sides of the piston 1 and a rotation means 12 that rotates at least one of the support members 11 to rotate the piston 1.

  2 (a) and 2 (c), the supply nozzle 30 is provided at a coating liquid supply port 34, a coating liquid passage 35 connected to the supply port 34, and a lower end 36 of the main body of the supply nozzle 30. A discharge port 31 connected to the passage 35 is provided. The supply port 34 is connected to a paint liquid supply means (not shown), and the paint liquid supply means supplies the paint liquid 40 to the supply port 34 at a predetermined supply flow rate at a predetermined supply timing. The coating liquid 40 entering from the supply port 34 reaches the discharge port 31 while filling the space of the passage 35. A plurality of supply ports 34 may be provided in order to fill the space of the passage 35 with the coating liquid 40 (not shown). The passage 35 has a shape that extends to the width of the blade 20 as shown in FIG. As shown in FIG. 2 (c), the discharge port 31 preferably has a slit shape so that the coating liquid is spread evenly in the width direction of the blade 20. Further, the discharge port 31 may have a non-discharge location 32 as shown in FIG. Moreover, as shown in FIG.2 (c), the discharge port 31 may have the shape which arrange | positioned the non-discharge location 32 uniformly, and has arrange | positioned the slit-shaped discharge port 31 vertically in series. . Further, as shown in FIG. 2D, the discharge port 31 may have a shape in which a plurality of discharge ports 31 having circular openings are arranged in a straight line. By making the internal shape of the passage 35 and the shape of the discharge port 31 as shown in FIG. 2, the coating liquid is in the form of one or two or more strips or in the form of a number of thin lines, and is almost independent of the location of the discharge port 31. It is discharged at a constant speed. As a result, the coating liquid can be spread evenly in the width direction of the blade 20.

  The coating liquid 40 is, for example, a polytetrafluoroethylene (PTFE) coating liquid, and includes a solid lubricant such as PTFE, molybdenum disulfide, and graphite, an organic binder resin, and an organic solvent. The viscosity of the coating liquid 40 is appropriately adjusted in consideration of the coating speed and the film thickness.

  The blade 20 has a flat blade-like cutting edge 23, and the width of the flat blade is the same as the width of the outer peripheral surface 2 of the head portion of the piston 1 or is larger than the width of the outer peripheral surface 2 of the head portion of the piston 1. Designed to be slightly larger. Thereby, the coating liquid 40 can be applied to the outer peripheral surface 2 of the head portion evenly and without dripping. Further, the blade 20 is brought close to the outer peripheral surface 2 of the head portion of the piston 1 with the blade edge 23 facing the piston 1 side and tilted downward. The head portion has a cylindrical shape, and the cutting edge 23 of the blade 20 is a flat blade. Therefore, when the head portion and the cutting edge 23 are in an approaching state, they can form gaps at equal intervals. Further, since the blade edge 23 of the blade 20 is inclined downward, the coating liquid 40 discharged to the upper surface 21 of the blade 20 flows toward the blade edge 23.

  In the present embodiment, the blade 20 preferably has a bank portion 22 at both ends sandwiching the blade edge 23 as shown in FIG. The paint liquid can be prevented from flowing down to both sides of the blade. 9, the width of the cutting edge 23 sandwiched between the bank portions 22 on both sides of the blade is the same as the width of the outer peripheral surface 2 of the head portion of the piston 1, or the outer peripheral surface of the head portion of the piston 1. It is preferably designed to be slightly larger than the width of 2. Interference with the bank portion 22 can be prevented on the rotation support end surface side and the coupling portion side of the head portion of the piston 1, and the coating liquid flows to the rotation support end surface side and the coupling portion side of the head portion. Can be prevented.

  In the present embodiment, as shown in FIG. 3, the upper surface 21 of the blade 20 includes a form that forms a straight line when viewed in a plane that crosses the head portion. Since the blade 20 having the upper surface 21 having a linear cross section is inclined downward toward the piston 1, the coating liquid 40 discharged to the upper surface 21 of the blade 20 flows toward the blade edge 23. Become. Further, it is possible to prevent the coating liquid 40 from flowing upward on the upper surface 21. Although FIG. 3 illustrates a form in which the blade 20 is tilted downward by about 45 °, the present embodiment is not limited to this angle. For example, the blade 20 may be tilted in a range of 30 ° to 60 °. An adjusting means may be provided and appropriately changed according to the viscosity of the coating liquid. More preferably, the angle is 40 ° to 50 °.

  In the present embodiment, as shown in FIG. 4, the upper surface 21 of the blade 20 includes a form that has a downwardly curved shape when viewed in a plane that crosses the head portion. Since the blade 20 having the convexly curved upper surface 21 below the cross section is inclined downward toward the piston 1, the coating liquid 40 discharged to the upper surface 21 of the blade 20 is directed toward the blade edge 23. Will flow. Further, it is possible to prevent the coating liquid 40 from flowing toward the upper side of the upper surface 21. At this time, the flow of the coating liquid 40 toward the cutting edge 23 can be made gentle, and the flow toward the upper side of the upper surface 21 can be more strongly suppressed. In FIG. 4, on the blade edge 23 side, a form inclined about 30 ° downward is illustrated, but this embodiment is not limited to this angle, and may be inclined within a range of 30 ° to 60 °, for example. Alternatively, an angle adjusting means may be provided and appropriately changed according to the viscosity of the coating liquid. More preferably, the angle is 40 ° to 50 °.

  In the present embodiment, as shown in FIG. 5, the blade 20 preferably has a damming portion 27 that prevents the coating liquid 40 from flowing upward on the opposite side of the cutting edge 23. It is possible to prevent the coating liquid 40 from moving above the nozzle discharge port 31. As shown in FIG. 5, the damming portion 27 is formed by providing a steeply inclined portion on the upper surface 21 of the blade 20. Moreover, you may form by providing a raised part in the upper surface 21 of the braid | blade 20 (not shown).

  In the present embodiment, as shown in FIG. 6, the upper surface 21 of the blade 20 preferably has a liquid repellent treatment surface 26. The coating liquid can be easily flowed in the direction of the tip 23 of the blade 20, and the discharge amount of the coating liquid can be easily controlled. Moreover, it becomes dirt prevention. The liquid repellent surface 26 is not particularly limited as long as it has a property of repelling the coating liquid. For example, the upper surface 21 is coated with a nickel-phosphorus (Ni-P) -based, hard chromium plating film, a DLC film, or a PVD film such as titanium nitride (TiN) or titanium carbide (TiC).

  In the present embodiment, as shown in FIG. 6, the upper surface 21 of the blade 20 preferably has a liquid storage portion 24 along the cutting edge 23 of the blade 20. It is possible to prevent the coating liquid from spilling from the tip of the blade. Further, when the blade 20 is separated from the piston 1, excess paint liquid can be stored. The accumulated coating liquid can be used for the next application. The liquid storage unit 24 is, for example, a dimple or a groove provided on the upper surface 21, or a surface subjected to rough surface processing (satin finish) by shot blasting. Both have flow resistance against the coating liquid.

  In this embodiment, as shown in FIG. 7, it is preferable that the end surface 25 of the blade edge of the blade 20 has a liquid repellent treatment surface. By making the coating liquid difficult to adhere to the end face 25 of the blade tip of the blade 20, it is possible to further prevent the coating liquid from spilling from the tip of the blade. Further, when the blade 20 is separated from the piston 1, the liquid breakage can be improved.

  In the present embodiment, as shown in FIG. 8, it is preferable that the inclination angle in the region of the liquid storage part 24 of the blade 20 is smaller than the inclination angle in other regions. The liquid storage unit 24 can stably store the coating liquid. Further, it is possible to further prevent the coating liquid from spilling from the tip of the blade 20.

  In the present embodiment, as shown in FIG. 3, the blade 20 is moved in the horizontal direction so that the blade edge 23 of the blade 20 approaches the outer peripheral surface 2 of the head unit until a predetermined distance is reached, or the outer periphery of the head unit is It is preferable to further include blade moving means 50 for moving the blade edge 23 of the blade 20 away from the surface 2. The predetermined distance when the closest approach is a parameter that affects the film thickness of the coating, and is appropriately adjusted to an optimal distance depending on the viscosity of the coating liquid and the shrinkage rate before and after the drying of the coating. ~ 0.3 mm. In addition, the film thickness of a lubricating film is 0.2-0.3 mm (before drying and baking), for example. Since the predetermined distance can be set only by controlling the horizontal movement of the blade 20, the coating apparatus 100 can have a simple structure. Moreover, since the relationship between the shape of the supply nozzle 30 and the control of the coating thickness is weak, even if the specifications of the paint or the film thickness of the coating are changed, it can be handled without replacing the supply nozzle 30 It is. Furthermore, the paint liquid accumulated on the blade edge 23 can be pushed by the discharged paint liquid 40, and the paint liquid accumulated on the blade edge 23 of the blade 20 can be used for the next application of the piston 1. Therefore, not only wasteful disposal of the coating liquid is required, but complicated control of the relationship between the rotation state of the head portion and the blade separation timing during application can be eliminated.

  In the present embodiment, in the form having the blade moving means 50, the supply nozzle 30 does not interfere with the piston 1, and the discharge port 31 of the supply nozzle 30 is fixed at a position away from the outer peripheral surface 2 of the piston 1 by a predetermined distance. It is preferable. Since only the blade 20 is moved by the blade moving means 50, the structure of the coating apparatus 100 can be simplified and control is facilitated. When the blade 20 moved in the horizontal direction by the blade moving means 50 comes closest to the piston 1, the discharge port 31 of the supply nozzle 30 approaches the upper surface 21 of the blade 20 with a predetermined distance as shown in FIG. .

  In the present embodiment, the blade moving unit 50 preferably moves the supply nozzle 30 together with the blade 20. Specifically, a support base (not shown) is attached to the blade moving means 50, and the blade 20 is fixed to the support base. The supply nozzle 30 is further fixed to the support base. The support 20 may be omitted, and the blade 20 and the supply nozzle 30 may be fixed directly to the blade moving unit 50. By adopting such a structure, the blade 20 and the supply nozzle 30 can be horizontally moved integrally without changing the relative positional relationship. By always keeping the upper surface 21 of the blade 20 and the discharge port 31 of the supply nozzle 30 close to each other, it is possible to prevent entrainment of air in the paint liquid near the discharge port of the supply nozzle 20. Further, the structure of the apparatus can be simplified and the control becomes easy.

  Next, the coating film coating apparatus that suppresses application of the coating liquid to the groove portion when the groove portion that circulates in the outer peripheral surface 2 of the head portion of the piston 1 will be described. In the present embodiment, as shown in FIG. 9, the outer peripheral surface 2 of the head portion has a groove portion 3 that circulates, and the upper surface 21a of the blade tip portion of the blade 20 approaches the groove portion 3 as shown in FIG. It is preferable to have a projection 28 at the position that inhibits the flow of the coating liquid. Referring to FIGS. 10 and 11, the protrusion 28 is disposed on the upstream side of the flow of the coating liquid with respect to the groove portion 3. Even if the coating liquid on the upper surface 21 of the blade 20 flows toward the cutting edge 23, the flow of the coating liquid is blocked by the protrusions 28. Referring to FIGS. 10 and 12, the protrusion 28 is not disposed on the groove portion 3 other than the upstream side of the flow of the coating liquid. At this time, when the coating liquid on the upper surface 21 of the blade 20 flows toward the cutting edge 23, the coating liquid is applied to the outer peripheral surface 2 of the head portion, and the coating liquid is spread by the blade 20. Thus, the application | coating to the groove part 3 can be suppressed among the outer peripheral surfaces 2 of a head part. The protrusion 28 preferably has a triangular shape with the blade edge 23 as a base when the upper surface 21 of the blade 20 is viewed from the front, and more preferably is an isosceles triangle. The coating liquid flowing on the upper surface 21 of the blade 20 can be branched and flowed on both sides of the groove 3. The protrusion 28 may have a protrusion shape obtained by cutting a square pillar or a columnar shape with the surface of the blade edge 23 when the upper surface 21 of the blade 20 is viewed from the front (not shown).

  If the flow is blocked by the protrusions 28, the supply of the coating liquid may be excessive on both sides of the groove portion 3. Therefore, in the present embodiment, it is preferable to have a nozzle shape that does not discharge the coating liquid upstream of the protrusion 28. As shown in FIGS. 2A and 2B, a partition 33 having the same width as that of the groove 3 extends vertically on the upstream side of the projection 28 in the coating liquid passage 35. Is provided. The width of the partition portion 33 is preferably in the range of 95 to 105% with respect to the width of the groove portion 3. As shown in FIG. 11, the discharge port 31 is partially blocked by the partition portion 33, and becomes a non-discharge location 32. On both sides of the partition portion 33, as shown in FIG. 12, the coating liquid passes through the passage 35 and the discharge port 31, flows on the upper surface 21 of the blade 20, and reaches the outer peripheral surface 2 of the piston 1. Thus, application to the groove portion 3 in the outer peripheral surface 2 of the head portion can be suppressed with higher accuracy.

  Next, a coating procedure will be described using the film coating apparatus 100 according to the present embodiment. The film coating method according to the present embodiment is a film coating method in which the coating liquid 40 is applied to the outer peripheral surface 2 of the columnar head portion of the piston 1, and the step of horizontally supporting the piston 1 by the rotation support means 10. (First step), a step of rotating the piston 1 by the rotation support means 10 (second step), and a blade moving means 50 until the cutting edge 23 of the blade 20 is placed on the outer peripheral surface 2 of the head portion at a predetermined distance. A step of approaching (third step), a step of discharging the coating liquid 40 from the supply nozzle 30 onto the upper surface 21 of the blade 20 and applying the coating liquid 40 to the outer peripheral surface 2 of the head portion (fourth step); And a step (fifth step) of moving the blade edge 23 of the blade 20 away from the outer peripheral surface 2 of the head portion by the means 50. After the fifth step, the rotation of the piston by the rotation support means 10 is stopped and the piston is removed. In addition, you may insert another process suitably between each process from a 1st process to a 5th process.

  In the first step, the rotation center of the piston 1 is supported by the support member 11 as shown in FIGS. At this time, the blade moving means 50 stands by at a position away from the piston 1.

  In the second step, as shown in FIGS. 1 and 9, the rotating member 12 rotates the support member 11 to rotate the piston 1. The rotation direction of the piston 1 is a direction in which the outer peripheral surface 2 of the head portion faces the upper surface 21 of the blade 20 (left rotation in FIG. 3).

  In the third step, the blade moving means 50 causes the blade edge 23 of the blade 20 to approach the outer peripheral surface 2 of the head portion until a predetermined distance is reached. At this time, it is preferable that the blade 20 is horizontally moved while the blade edge 23 is inclined downward. When the coating liquid is collected at the cutting edge portion of the upper surface 21 of the blade 20, it can be brought close to the piston 1 with the coating liquid stored there as it is.

  In the fourth step, the coating liquid 40 is discharged from the supply nozzle 30 onto the upper surface 21 of the blade 20, and the coating liquid 40 is applied to the outer peripheral surface 2 of the head portion. The coating liquid discharged to the upper surface 21 of the blade 20 by a predetermined amount pushes the coating liquid discharged in the previous application process accumulated in the blade tip portion toward the piston 1, and the accumulated coating liquid preferentially reaches the piston 1. It is applied to the outer surface 2 of the head part. Thereby, the coating liquid 40 is spread by the cutting edge 23 of the blade 20 around the entire head portion of the rotating piston 1.

  In the fifth step, the blade edge 23 of the blade 20 is moved away from the outer peripheral surface 2 of the head portion by the blade moving means 50. Thereby, the cutting edge 23 of the blade 20 can be separated from the piston 1 while keeping a coating film of a predetermined thickness on the outer surface 2 of the head portion of the piston 1. Further, when the coating liquid is accumulated in the blade edge portion, it is preferentially applied as described in the third step and the fourth step in the application step to the next piston 1.

100 Film coating device 1 Piston 2 Outer peripheral surface of head
3 Groove 10 Rotation Support Means 11 Support Member 12 Rotation Means 20 Blade 21 Blade Top Surface 21a Blade Blade Top Surface 22 Bank 23 Blade Edge 24 Liquid Storage Section 25 Blade End Face 26 Liquid Repellent Treatment Surface 27 Weir Stop 28 Supply nozzle 31 Discharge port 32 Non-discharge location 33 Partition part 34 Supply port 35 Passage 36 Lower end 40 of main body Paint liquid 50 Blade moving means

Claims (14)

In the coating coating apparatus (100) for rotating the piston (1) for the compressor in a horizontal state and applying the coating liquid (40) to the outer peripheral surface (2) of the cylindrical head portion of the piston,
Rotation support means (10) for horizontally supporting and rotating the piston;
A blade (20) in a state where a flat blade-shaped cutting edge (23) is inclined downward toward the piston side;
A coating coating apparatus (100) comprising: a supply nozzle (30) for discharging the coating liquid onto the upper surface (21) of the blade.   By moving the blade (20) in the horizontal direction, the blade edge (23) of the blade approaches the outer peripheral surface (2) of the head unit until a predetermined distance is reached, or from the outer peripheral surface of the head unit. The film coating apparatus according to claim 1, further comprising blade moving means (50) for moving the blade tip away from the blade.   The film coating apparatus according to claim 1 or 2, wherein the blade (20) has bank portions (22) on both sides sandwiching the blade edge (23).   The upper surface (21) of the blade has a curved shape that protrudes downward or a linear shape when viewed in a plane crossing the head portion. The film coating apparatus as described in any one of these.   The said blade (20) has a damming part (27) which prevents the said coating liquid (40) from flowing upwards on the opposite side of the said blade edge | tip (23). The film coating apparatus as described in any one of -4.   The film coating apparatus according to any one of claims 1 to 5, wherein the upper surface (21) of the blade has a liquid repellent surface (26).   The film coating according to any one of claims 1 to 6, wherein the upper surface (21) of the blade has a reservoir (24) along the cutting edge (23) of the blade (20). apparatus.   The film coating apparatus according to claim 7, wherein an inclination angle of the blade (20) in the area of the liquid storage section (24) is smaller than an inclination angle of other areas.   The film coating apparatus according to any one of claims 1 to 8, wherein an end surface (25) of a blade edge of the blade has a liquid repellent treatment surface (26).   The supply nozzle (30) does not interfere with the piston (1), and the discharge port (31) of the supply nozzle is fixed at a position away from the outer peripheral surface (2) of the piston by a predetermined distance. The film coating apparatus according to claim 2, wherein the apparatus is a coating apparatus.   The film coating apparatus according to any one of claims 2 to 9, wherein the blade moving means (50) moves the supply nozzle (30) together with the blade (20). The outer peripheral surface (2) of the head portion has a groove portion (3) that circulates,
The upper surface (21a) of the blade tip portion of the blade (20) has a protrusion (28) that inhibits the flow of the coating liquid (40) to the groove (3) at a position approaching the groove. The film coating apparatus according to any one of claims 1 to 11.   13. The film coating apparatus according to claim 12, wherein the supply nozzle (30) has a nozzle shape that does not discharge the paint liquid (40) upstream of the protrusion (28). A coating for applying a coating liquid (40) to the outer peripheral surface (2) of the cylindrical head portion of the piston (1) using the coating coating apparatus (100) according to any one of claims 2 to 13. A coating method comprising:
Horizontally supporting the piston by the rotation support means (10);
Rotating the piston by the rotation support means;
Bringing the blade edge (23) of the blade closer to the outer peripheral surface of the head portion by the blade moving means (50) until reaching a predetermined distance;
Discharging the coating liquid from the supply nozzle (30) to the upper surface (21) of the blade, and applying the coating liquid to the outer peripheral surface of the head part;
And a step of moving the blade edge of the blade away from the outer peripheral surface of the head by the blade moving means.

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