WO2003099455A1

WO2003099455A1 - Cartridge for coating

Info

Publication number: WO2003099455A1
Application number: PCT/JP2003/006223
Authority: WO
Inventors: Tetsuya Sonoda
Original assignee: Abb K.K.
Priority date: 2002-05-23
Filing date: 2003-05-19
Publication date: 2003-12-04

Abstract

A cartridge for coating, wherein a recessed groove (38) radially extending from near the axial center position (position on an axis O1-O1) of a cylinder (23) toward the inner peripheral surface (23C) thereof is provided in the bottom face (23A) of the cylinder (23), and a paint storage chamber side opening (31A) at the cylinder side passage part (31) of a paint passage (29) is opened to the groove bottom (38A) of the recessed groove (38), whereby since washing fluid fed from a washing fluid passage (36) into a washing space (S) flows smoothly into the recessed groove (38), paint accumulated while the washing fluid flows through the washing space (S) can be washed out with less washing fluid in a short time, and since the outlet (36B) of the washing fluid passage (36) is formed outer-radially aslant toward the inner peripheral surface (23C) of the cylinder (23), the paint can be washed out by flowing the washing fluid into a minute annular space (S2).

Description

Description Painting Cartridge Technical Field

The present invention relates to a coating cartridge which is mounted, for example, on a coating machine in a replaceable manner and supplies the paint filled therein to the coating machine. Background art

2. Description of the Related Art Generally, a coating system for coating an object to be coated such as a car body is composed of a coating machine such as a paint port and a coating machine attached to the coating machine. In this coating system, the coating operation machine is operated by a program, and the coating is automatically performed by spraying the coating from the coating machine.

In recent years, there has been a coating system using a coating cartridge (for example, see Japanese Patent Application Laid-Open No. 200-202) as a coating system corresponding to a reduction in the amount of paint and cleaning fluid discarded at the time of color change and an increase in coating color. -Japanese Patent Publication No. 113996). This cartridge-type painting system replaces the painting cartridges for each color, which are filled with paints of different paint colors, on the painting machine every time the car body is painted. It has become.

The coating cartridge according to the prior art used in the cartridge type coating system described above includes a hollow cylinder extending in the axial direction and a body having a feed tube extending in the axial direction from the cylinder. A piston which defines a paint storage chamber for storing the paint in the cylinder of the pod and an extrusion liquid storage chamber in which the extrusion liquid flows in and out; A paint passage communicating with the accommodation chamber and the tip end of the feed tube, and discharging and filling the paint by a paint valve, and discharging the paint through the paint passage provided in the body. An extruding liquid passage through which an extruding liquid flows into and out of the extruding liquid storage chamber when filling is performed; and a supply of a cleaning fluid to the coating chamber by a cleaning fluid valve provided in the body. And a cleaning fluid passage through which cleaning is performed.

Here, the paint passage communicating between the tip end of the feed tube and the paint storage chamber is opened at the deepest portion of the bottom surface of the cylinder having a concave conical opening on the paint storage chamber side. Further, the cleaning fluid passage for supplying the cleaning fluid to the coating chamber is provided on the bottom at a position different from the opening of the coating passage on the coating chamber side. Thus, when cleaning the interior of the paint chamber, the cleaning fluid passage supplies the cleaning fluid to the entire interior of the paint chamber, and the paint passage collects and discharges the cleaning fluid that has washed the interior of the paint chamber.

The coating power grid configured in this manner is selected according to the coating color and is attached to the coating machine. Then, the paint valve is opened, and the extruding liquid is appropriately supplied to the extruding liquid storage chamber in the cylinder, so that the paint filled in the coating chamber in the cylinder is fed through the feed passage through the feed passage. From the tip of the machine toward the coating machine. Thereby, the coating machine atomizes the paint by atomizing means such as a rotary atomizing head and sprays the paint toward the object to be coated.

In addition, the paint cartridge can be replaced with another paint cartridge filled with paint of another color, without having to discard paint and cleaning fluid. Can do it. And the empty cartridge is It is removed and attached to a paint filling device, and the paint filling device fills the paint containing chamber with the paint filling device.

Here, the paint filling device that fills the paint cartridge with paint is described.When filling the empty paint cartridge with a paint of the same color, With the paint valve opened, paint is filled into the paint chamber from the tip of the feed tube via the paint passage. In addition, the paint filling device has a function of discharging the paint remaining in the paint cartridge of the coating cartridge using the extruded liquid and returning it to the paint supply source side. It has the function of cleaning paint adhered to paint passages and the like.

For example, when shutting down a cartridge-type painting system for maintenance work, long vacations, etc., or when painting while changing colors with one painting cartridge common. It is necessary to discharge the paint remaining in the paint storage room, the paint passage, and the like, and to wash the paint adhered to the paint storage room, the paint passage, and the like.

The cleaning operation at this time is as follows. The paint valve is opened, the extruded liquid flows into the extruded liquid storage chamber in this state, and the piston is pushed to supply surplus paint to the paint storage chamber. Return to source side. Thereafter, the cleaning fluid valve is opened, the cleaning fluid flows into the paint storage chamber from the cleaning fluid passage, and the paint adhered to the paint storage chamber, the paint passage, and the like is washed.

According to the above-described conventional painting cartridge, the paint passage opening on the paint storage chamber side of the paint passage communicating between the tip end of the feed tube and the paint storage chamber has a concave conical cylinder. The cleaning fluid passage that opens to the center, which is the deepest position of the bottom surface of the paint passage, and that supplies the cleaning fluid to the paint storage chamber It has an opening. As a result, the cleaning fluid that has flowed into the paint chamber formed by the space formed between the bottom surface of the cylinder and the end face of the piston, has spread through this space, and has a paint passage opened at the center of the bottom surface after being extended. Are collected at the opening of the paint chamber, and are discharged to the outside through the paint passage.

However, if the paint passage is opened at the deepest part (center) of the bottom of the cylinder, the cleaning fluid that has spread in the space between the bottom of the cylinder and the end face of the piston will be flushed from all directions. It flows intensively toward the paint passage. For this reason, the cleaning fluids flowing toward the paint passage opened at the center are turbulent, colliding with each other so as to collide with each other, and cannot flow into the paint passage opening smoothly. Therefore, the cleaning fluid flowing in the space between the bottom surface of the cylinder and the end surface of the piston interferes with each other and loses the flow velocity, so that the adhered paint cannot be washed evenly. Problem.

Also, a small annular space is formed between the inner peripheral surface of the cylinder and the outer peripheral surface of the piston to displace the piston, and the paint also enters this space. However, the cleaning fluid flowing from the cleaning fluid passage into the paint storage chamber flows to the opening side of the paint passage, and it is difficult for the cleaning fluid to enter the minute annular space, and much cleaning time is required. There is a problem that paint remains in this area. Disclosure of the invention

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems of the related art, and an object of the present invention is to improve the efficiency of cleaning by ensuring that the paint adhered to the paint storage chamber can be cleaned in a short time. The purpose is to provide a painted coating cartridge. A coating cartridge according to the present invention contains a hollow cylinder extending in an axial direction, a body having a feed tube extending in an axial direction from the cylinder, and a paint in the cylinder of the pod. A movable partition wall defined between the paint storage chamber and the extrusion liquid storage chamber through which the extruded liquid flows in and out, and the paint storage chamber communicates with the tip end of the feed tube through the paint valve to discharge the paint. An extruding liquid passage provided in the body, and an extruding liquid passage through which the extruding liquid flows into and out of the extruding liquid storage chamber when discharging and filling the coating through the coating passage. And a cleaning fluid passage provided in the body and supplying a cleaning fluid to the paint storage chamber by a cleaning fluid valve.

In order to solve the above-described problems, the feature of the configuration adopted by the present invention is that the bottom surface in the cylinder extends radially from the vicinity of the axial center position of the cylinder toward the inner peripheral surface. A concave groove formed in a concave shape is provided, and the opening of the paint passage on the side of the paint containing chamber is configured to be opened at the bottom of the groove.

With this configuration, the cleaning fluid that has flowed from the cleaning fluid passage into the cleaning space between the bottom surface of the column and the movable partition wall flows so as to extend through the cleaning space, and then flows out of the column. The fluid flows smoothly from the vicinity of the center of the shaft into the concave groove formed in a concave shape toward the inner peripheral surface. Therefore, the cleaning fluid flowing toward the groove in the cleaning space can flow into the groove without colliding with each other, so that the cleaning fluid can flow evenly and evenly in the cleaning space. The entire cleaning space can be cleaned. Then, the cleaning fluid that has flowed into the concave groove is discharged to the outside through the paint passage opened at the groove bottom of the concave groove.

According to the present invention, the outflow opening of the cleaning fluid passage is It is formed so as to be inclined outward in the radial direction with respect to the axis of the cylinder so as to open toward the inner peripheral surface of the cylinder.

With this configuration, the cleaning fluid flowing from the cleaning fluid passage into the cleaning space between the bottom surface of the cylinder and the movable partition wall is discharged radially outward toward the inner peripheral surface of the cylinder. It is. As a result, the cleaning fluid can be supplied also to a small annular space formed between the inner peripheral surface of the cylinder and the movable partition. Thus, the cleaning fluid can reliably clean the paint that has entered the minute annular space between the cylinder and the movable partition.

According to the present invention, the outflow-side opening of the cleaning fluid passage is opened at the bottom surface inside the cylinder on the side opposite to the concave groove with respect to the axial center position of the cylinder in the radial direction.

With this configuration, the cleaning fluid flowing from the cleaning fluid passage into the cleaning space between the bottom surface of the cylinder and the movable partition wall is arranged on the opposite side in the radial direction with respect to the cylinder center position. Since the flow is evenly divided into the left and right toward the formed groove and flows toward the groove, the entire cleaning space can be cleaned.

According to the present invention, the inner peripheral surface of the cylinder is provided with a diameter-enlarging annular groove whose diameter is increased over the entire circumference at a position adjacent to the bottom surface.

With this configuration, an annular space is formed between the inner peripheral surface of the cylinder and the outer peripheral surface of the movable partition, but the enlarged annular groove forms a cleaning fluid passage in this annular space. It is possible to form a full-peripheral opening through which the cleaning fluid flows from the inside. As a result, the cleaning fluid discharged from the cleaning fluid passage can positively flow into the annular space from the entire peripheral opening, and the paint remaining in the annular space can be reliably washed. Can be.

According to the present invention, the outflow side opening of the cleaning fluid passage is provided with a notch for guiding the cleaning fluid toward the center of the cylinder.

With this configuration, a part of the cleaning fluid flowing from the cleaning fluid passage into the cleaning space between the bottom surface of the cylinder and the movable partition wall is guided through the cleaning space to the notch, and the cleaning fluid is guided to the notch. Since the water flows toward the center of the cylinder shaft, paint adhered to the center of the cylinder cylinder can be sufficiently washed in the washing space.

According to the present invention, the movable partition is a piston that is displaced in the axial direction along the inner peripheral surface of the cylinder, and the bottom surface of the cylinder is formed in a concave conical shape in which the axial center position of the cylinder is the deepest part. The end surface of the piston facing the bottom surface of the cylinder is formed in a convex conical shape in which the center of the cylinder axis is a protruding end. With this configuration, the interior of the paint accommodating chamber is cleaned. When washed with a fluid, the washing fluid and the washed paint are collected at the center of the shaft along the bottom surface of the cylinder formed in the shape of a concave cone, and can flow into the groove without being left in the paint chamber. it can. Also, when the end face of the piston approaches the bottom of the cylinder, a uniform washing space is formed between the concave-conical bottom face and the convex-conical end face. According to the present invention, the bottom surface of the cylinder is formed in a concave conical shape in which the axial center position of the cylinder is the deepest part, and the opening of the paint passage on the side of the paint storage chamber is formed. The configuration is such that the groove opens at the bottom of the groove at a position deeper than the deepest part of the cylinder bottom. With this configuration, when the paint chamber is washed with the washing fluid, the washing fluid and the washed paint are collected at the center of the shaft along the bottom surface of the cylinder formed in a concave conical shape. However, the paint can be sequentially and smoothly circulated from the paint storage chamber to the paint passage via the groove.

According to the present invention, the concave groove is formed as a long groove or an elliptical concave groove extending in the radial direction of the cylinder. With this configuration, the surface area of the concave groove can be reduced, and the number of surfaces to be cleaned can be reduced. Further, the amount of paint remaining in the groove can be reduced. In this case, the concave groove may be formed as a long groove having a substantially constant width dimension and extending in the radial direction of the cylinder.

According to the present invention, the concave groove is formed as a long groove or an elliptical concave groove extending in the radial direction of the cylinder, and the groove bottom of the concave groove is located at the deepest deepest position at the intermediate portion in the length direction. With this configuration, when the paint passage opening on the paint passage is opened at the deepest position at the bottom of the groove, the entire amount is discharged without leaving the washed paint in the groove. be able to. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a front view showing a state in which a coating force trigger according to a first embodiment of the present invention is applied to a cartridge type coating system.

FIG. 2 is an enlarged vertical sectional view showing the rotary atomizing head type coating apparatus and the coating cartridge in FIG.

FIG. 3 is a vertical cross-sectional view showing the coating cartridge according to the first embodiment alone.

FIG. 4 is a vertical cross-sectional view showing a state in which the coating cartridge according to the first embodiment is mounted on a paint filling device. FIG. 5 is an enlarged vertical cross-sectional view of a main part in FIG.

FIG. 6 is a cross-sectional view of the cylinder, as viewed in the direction of arrows VI-VI in FIG.

FIG. 7 is a cross-sectional view of the cylinder and the piston as viewed from the direction indicated by arrows VII-VII in FIG. 5 of the annular space between the inner peripheral surface of the cylinder and the outer peripheral surface of the piston.

FIG. 8 is an enlarged longitudinal sectional view of the main part of the flow of the cleaning fluid between the cylinder and the piston viewed from the direction indicated by arrows VIII-VIII in FIG.

FIG. 9 is an enlarged vertical cross-sectional view of a main part, in which the vicinity of the outlet of the cleaning fluid passage in FIG. 8 is enlarged.

FIG. 10 is an enlarged vertical cross-sectional view of a main part of a portion of a painting power bridge according to a second embodiment of the present invention, as viewed from the same position as in FIG.

FIG. 11 is a cross-sectional view of a painting force trigger according to a third embodiment of the present invention, as viewed from the same position as in FIG.

FIG. 12 is an enlarged vertical sectional view of a main part of the coating cartridge according to the third embodiment viewed from the direction indicated by arrows XII-XII in FIG. 11.

FIG. 13 is a longitudinal sectional view showing a paint cartridge according to a first modification of the present invention.

FIG. 14 is a cross-sectional view of a coating cartridge according to a second modification of the present invention, as viewed from the same position as in FIG. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the coating cartridge according to the embodiment of the present invention is applied to a coating port and a rotary atomizing head type coating device. — An example in which the present invention is applied to a trigger type coating system will be described in detail with reference to the accompanying drawings.

First, FIGS. 1 to 9 show a first embodiment of the present invention. Reference numeral 101 denotes a coating port used as a coating machine, and the coating port 101 executes a coating operation using a rotary atomizing head type coating apparatus 1 described later. The paint port 101 is provided with a base 102, a vertical arm 103 rotatably and swingably mounted on the base 102, and a vertical arm 103 provided on the base 102. The horizontal arm 104 is roughly constituted by a horizontal arm 104 slidably provided at the tip of the arm 103 and a wrist 105 provided at the front end of the horizontal arm 104. Further, a paint filling device 41 described later is arranged in the operation range of the painting port 101.

Numeral 1 denotes a rotary atomizing head type coating device (hereinafter referred to as a coating device 1) provided in a coating robot 101, and the coating device 1 includes an eight housing 2 and a feeder, which will be described later, as shown in FIG. It is roughly composed of the Ube's through-holes 5 and 12, the coating machine 6, and the coating cartridge 21.

Reference numeral 2 denotes a housing attached to the painting rod 101. The housing 2 is formed integrally with a neck 2A detachably attached to the tip of the wrist 105 and the tip of the neck 2A. And a head 2B. Here, a coating machine mounting portion 3 is formed in a concave cylindrical shape on the front side of the head portion 2B, and a cartridge mounting portion 4 is formed in a concave cylindrical shape on the rear side of the head portion 2B. Is formed. In addition, a female connecting portion 4B and a convex portion 4C are separately formed on the bottom 4A of the cartridge mounting portion 4. Further, a housing side feed tube through hole 5 is formed in the center of the head portion 2B so as to extend in the axial direction. Reference numeral 6 denotes a coating machine mounted in the coating machine mounting portion 3 of the head portion 2B. The coating machine 6 is rotated by an air motor 7 for driving a rotary shaft 7A to rotate, and by the air motor 7. A rotary atomizing head 8 for atomizing the supplied paint by centrifugal atomization and spraying it toward an object to be coated, and a paint particle provided on the front end side of the air motor 7 and emitted from the rotary atomizing head 8 And a shaving air ring 9 having a large number of shaving air ejection holes 9A and 9A (only two are shown) for forming the pattern.

Reference numeral 10 denotes a high-voltage generator provided in the network portion 2A of the housing 2, and the high-voltage generator 10 is constituted by, for example, a cockcroft circuit, and is connected to a power supply device (not shown). The supplied voltage is increased to, for example, −60 to −120 kV. The high-voltage generator 10 applies a high voltage to the rotary atomizing head 8 via the rotary shaft 7A of the air motor 7 to directly charge the paint.

Reference numeral 11 denotes a plurality of air passages provided at a neck portion 2A of the housing 2 and connected to a control air source (not shown). Each of the air passages 11 serves to control an air motor 7. It supplies single-bin air, bearing air, brake air, shaving air for forming a spray pattern of paint, etc., but in this embodiment, typically only one air passage is shown. Is shown.

Reference numeral 1 2 denotes a feeder-side feed tube through-hole provided in the axial direction of the rotary shaft 7 A constituting the air motor 7. The base end of the feeder-side feed tube 1 through-hole is a housing. The side feed tube opens into the through hole 5, and the tip side opens into the rotary atomizing head 8. Then, feed cartridge 2 1 is inserted into feed tube through holes 5 and 12. The feed tube 24 is detachably fitted.

Reference numeral 13 denotes a housing-side extrusion thinner passage serving as an extrusion liquid passage provided in the housing 2, and the extrusion thinner passage 13 is formed in an L-shape bent rearward at the position of the female connection portion 4B. ing. One end of the housing-side extrusion thinner passage 13 is connected to an extrusion thinner supply / discharge valve (not shown), and the other end is opened at the bottom of the female connection portion 4 B of the cartridge mounting portion 4. I have. The bent portion of the housing-side extrusion thinner passage 13 is a valve seat portion 13A where a valve element 15C of a thinner valve 15 described later separates and sits. Here, the extruded thinner passage 13 is used for inflow and outflow of the extruded thinner between the extruded thinner supply and discharge valves.

Reference numeral 14 denotes a housing-side port air passage provided in the housing 2. The pilot air passage 14 is partially connected to a pilot valve source for a paint valve through a pilot air pipe. (Not shown). The other end of the pilot air passage 14 is provided at the bottom 4A of the cartridge mounting portion 4 so as to correspond to the pilot-side pilot air passage 33 on the force cartridge described later. Opened male connection (not shown).

Reference numeral 15 denotes a thinner valve provided on the head portion 2B of the housing 2. The thinner valve 15 is slidable into the cylinder hole 15A and the cylinder hole 15A.ピ The fitted piston 15B and the valve body which extends in the axial direction from the piston 15B, and the tip end of which is separated from and seated on the valve seat 13A of the housing side extrusion thinner passage 13 The valve is normally closed by a valve spring 15D that urges the valve body 15C in the valve closing direction via the piston 15B.

The thinner valve 15 is always pushed out on the housing side. The thinner passage 13 is shut off, and the supply of thinner to the extrusion thinner storage chamber 27 of the coating cartridge 21 described later is stopped. On the other hand, the thinner valve 15 is opened when the pilot air is supplied from the thinner valve pilot air source via the pilot air passage 16 or the like, and the extruded thinner supply / discharge valve is provided. It supplies the extruded thinner to the extruded thinner storage chamber 27 or returns the extruded thinner to the extruded thinner supply / discharge valve side.

Next, 2 1 a, 2 1 b, · '· 2 1 η and 2 1 p store the a color, b color,… n color and other paints separately, and supply them to the rotary atomizing head 8. Therefore, it is a coating cartridge (hereinafter, referred to as a coating cartridge 21 as a whole) used in the present embodiment. As shown in FIG. 3, each of the coating cartridges 21 includes a body 22, a piston 25, a paint passage 29, and a cartridge-side extrusion thinner passage 34 described later. , A paint valve 32, a cartridge-side cleaning fluid passage 36, a cleaning fluid valve 37, and a concave groove 38.

Here, as shown in Fig. 1, paints of a color, b color, and 'color are special colors that have relatively high frequency of painting. Ridges 21a, 21b, ... 2In. On the other hand, other paints are relatively infrequently applied and share one painting cartridge 21p.

Reference numeral 22 denotes a pod constituting the outer shape of the coating cartridge 21. The pod 22 is roughly constituted by a cylinder 23 and a feed tube 24 described later.

Reference numeral 23 denotes a cylindrical cylinder that forms a part of the body 22. The cylinder 23 is detachably fitted to the cartridge mounting portion 4. It is formed as a cylindrical body (cylinder) extending forward and backward with an axis 〇l_Ol. In addition, the inside of the cylinder 23 includes a front bottom surface 23 A, which is a feed tube 24 side described later, a top surface 23 B opposite to the bottom surface 23 A in the axial direction, and the bottom surface. The inner peripheral surface 23 C is located between 23 A and the top surface 23 B.

Here, the bottom surface 23 A of the cylinder 23 is formed in a concave conical shape in which the axial center position of the cylinder 23 (position on the axis 0 1—〇 1) is the deepest part 23 A 1. Have been. As a result, in the standing posture in which the paint cartridge 21 is mounted on the paint filling device 41 described later, the bottom surface 23 A is a concave cone of the cleaning fluid and the washed paint. They can be gathered at the center of the shaft according to the shape and can flow into the groove 38.

On the other hand, at the front of the cylinder 23, a male connecting portion 23D is provided so as to protrude at a position corresponding to the female connecting portion 4B of the cartridge mounting portion 4, and the cartridge mounting portion 4 is provided. A female connecting portion 23E is provided at a position corresponding to the convex portion 4C of FIG. The rear of the cylinder 23 is provided with a gripping projection 23F which is gripped when the coating cartridge 21 is replaced. The female connecting portion 23E is formed as a long hole extending in the axial direction for accommodating a cleaning fluid valve 37 described later.

A feed tube 24 is provided coaxially in the axial direction from the cylinder 23, that is, a feed tube extending coaxially with the axis 〇 1-〇 1, and a paint passage 29 described later is provided inside the feed tube 24. The feed tube side passage portion 30 is formed. Here, the feed tube 24 allows the paint supplied from a paint storage chamber 26 to be described later to flow out from the tip to the rotary atomizing head 8 through the paint passageway 29. Also, feed When filling the paint accommodating chamber 26 with the paint, the tube 24 is connected to a connecting member 48 of a paint filling device 41 described later so that the paint filling port can be filled. Used as

Reference numeral 25 denotes a piston as a movable partition provided in the cylinder 23. The piston 25 is fitted along the inner peripheral surface 23C so as to be displaceable in the axial direction. . Here, the piston 25 is, as shown in FIGS. 5, 7, and 8, a front end surface 25A facing the bottom surface 23A of the cylinder 23, and a rear end surface facing the top surface 23B. The outer peripheral surface 25C facing the end surface 25B and the inner peripheral surface 23C is formed in a short cylindrical shape in the axial direction. The piston 25 defines a paint storage chamber 26 in the cylinder 23 between the front end face 25A and the bottom face 23A for accommodating the paint. An extruder thinner storage chamber 27 is provided between 3B and the rear end face 25B for accommodating an extruder thinner as an extruding liquid so as to be able to flow in and out therefrom.

Reference numeral 28 denotes a sealing ring mounted on the outer peripheral surface 25C of the piston 25, and the sealing ring 28 holds the paint chamber 26 and the extrusion thinner chamber 27 in a liquid-tight manner. are doing.

Here, the front end face 25 A of the piston 25 has a projection end at the axial center position of the cylinder 23, and is substantially the same as the bottom face 23 A of the concave cone-shaped cylinder 23. It is formed into a matching convex cone. As a result, when the piston 25 is brought close to the bottom surface 23A of the cylinder 23, there is a gap between the bottom surface 23A and the front end surface 25A of the piston 25. A bottom space S1 (shown in FIGS. 5, 8, and 9) composed of a space with a small gap in the height direction can be formed. In this case, the bottom space S 1 is entirely covered when cleaning the paint cartridge 21. The cleaning fluid can be circulated throughout.

Further, between the outer peripheral surface 25 C of the piston 25, the inner peripheral surface 23 C of the cylinder 23, and the seal ring 28, an annular space S having an annular space with a small radial gap is provided. 2 is formed.

The bottom space S1 and the annular space S2 constitute a washing space S between the cylinder 23 and the piston 25. Further, the washing space S forms one form of a paint accommodating room 26 for washing the coating cartridge 21.

Reference numeral 29 denotes a paint passage provided between the cylinder 23 and the feed tube 24. The paint passage 29 communicates between the paint storage chamber 26 and the tip end of the feed tube 24. The paint is discharged and filled by a paint valve 32 described later. The paint passage 29 is constituted by a feed tube-side passage 30 and a cylinder-side passage 31 described later.

Reference numeral 30 denotes a feed tube-side passage portion provided in the feed tube 24 so as to extend in the axial direction. The feed tube-side passage portion 30 has a cylinder 2 as shown in FIG. It is formed coaxially with the axis 0 1 — 0 1 of 3, and its front end is open toward the rotary atomizing head 8. In addition, a valve seat portion 30A is provided with a reduced diameter on the tip side of the feed tube side passage portion 30. The valve seat portion 3OA is provided with a valve body 3 2C of a paint valve 32 described later. Separates and sits down.

Numeral 31 denotes a cylinder-side passage provided in the cylinder 23 so as to communicate the paint chamber 26 with the feed tube-side passage 30. Here, in order to avoid a paint valve 32, which will be described later, which is disposed on an axis 0 1—〇 1 of the cylinder 23, one end of the cylinder side passage section 31 is connected to the axis 0 1—O 1. Radially spaced The other end side is bent in the direction of the axis O 1 -〇 1 and connected to the feed tube side passage portion 30. The opening 31A of the cylinder-side passage 31 on the side of the paint chamber is located at a position eccentric radially outward from the axial center position of the cylinder 23 at the groove bottom 38 of the concave groove 38 described later. Open to A.

Here, as shown in FIG. 8, the opening 31A of the cylinder side passage portion 31 on the side of the paint storage chamber is deeper than the deepest portion 23A1 of the bottom surface 23A of the cylinder 23. It is opened at the deepest position 38 A1 of the groove bottom 38 A of the concave groove 38 at a position deeper by H. As a result, the cylinder-side passage portion 31 passes the cleaning fluid collected at the center of the bottom surface 23 A of the cylinder 23 (the deepest portion 23 A 1) and the washed paint to the groove 3. 8, it is possible to smoothly flow into the paint container side opening 31A.

In addition, since the cylinder side passage portion 31 is disposed at a position where one end is eccentric to the outside in the radial direction with respect to the axis O 1-01 of the cylinder 23, the cylinder side passage portion 3 1 When forming a hole, drilling in the oblique direction communicating with the feed tube side passage 30 and axial drilling in communication with the groove 38 (drilling) are performed twice. It can be easily formed simply by applying.

Reference numeral 32 denotes a paint valve provided in the body 22. The paint valve 32 is disposed substantially coaxially with the axis 〇 1 _ 0 1 of the cylinder 23, and forms a normally closed valve. . Here, the paint valve 32 includes a cylinder hole 32A, a piston 32B slidably fitted in the cylinder hole 32A, and a piston 32B. B extends axially in the feed tube 24 from B, and its distal end is separated from and seated on the valve seat portion 30 A of the feed tube side passage portion 30, and the piston 32 C Through the valve 32B It is composed of a valve spring 32D that urges 32C in the valve closing direction.

Then, the paint valve 32 always shuts off the feed tube side passage portion 30 with the valve body 32 C and stops the supply of the paint to the rotary atomizing head 8. On the other hand, when the pilot air is supplied from the paint valve pilot air source via the housing-side pilot air passage 14 and the cartridge-side pilot air passage 33, etc. This valve supplies the paint in the paint chamber 26 to the rotary atomizing head 8.

Reference numeral 34 denotes a cartridge-side extrusion thinner passage provided in the body 22. The extrusion thinner passage 34 is provided to extend in the axial direction on the outer peripheral side of the cylinder 23. One end of the cartridge-side push-out thinner passage 34 is open at the distal end face of the male connection portion 23 D of the cylinder 23, and the other end thereof communicates with the push-out thinner accommodating chamber 27. When the paint in the paint chamber 26 is discharged from the cartridge side extrusion thinner passage 34, the thinner valve 15 is opened, and the extruded thinner flows into the extrusion thinner chamber 27. By doing so, the piston 25 is pushed toward the feed tube 24 side. Thereby, the piston 25 pushes the paint filled in the paint storage chamber 26 toward the rotary atomizing head 8. On the other hand, when the paint is filled in the paint storage chamber 26, the thinner valve 15 is opened again, and the extruded thinner in the extrusion thinner storage chamber 27 flows out.

Note that, as the extruded thinner as the extruded liquid, one having high insulating properties or high electric resistance is used in order to prevent the high voltage generated by the high voltage generator 10 from leaking through the thinner. Numeral 35 is a quick coupling provided in the male connection portion 23D of the cylinder 23 and provided at the open end of the force-trigger-side push-out thinner passage 34. It is configured as a check valve including the male connection 23D of the cylinder 23. Then, the quick coupling 35 opens when the painting force trigger 21 is mounted on the cartridge mounting part 4 or the cylinder support part 47 of the filling table 42 described later. And allow the distribution of extruded thinner. On the other hand, when the cylinder 23 is removed from the cartridge mounting part 4 and the cylinder support part 47, the valve is closed to prevent the extrusion thinner from flowing out from the extrusion thinner passage 34. Numeral 6 indicates a cartridge-side cleaning fluid passage provided in the cylinder 23 of the coating cartridge 21. Here, as shown in FIG. 5, the cleaning fluid passage 36 has an inlet 36A opening at the bottom of the hole of the female connection portion 23E and an outlet 36B having a cylinder 23. It is open at the outer peripheral position of the bottom surface 23A. The cartridge-side cleaning fluid passage 36 has a diameter relative to the axis 0 1 _〇 1 of the cylinder 23 so as to open toward the inner peripheral surface 23 C of the cylinder 23. It is formed to incline outward in the direction. As a result, the cleaning fluid passage 36 is supplied with the cleaning fluid composed of the pressurized cleaning thinner and the cleaning air supplied from the filling table side cleaning fluid passage 52 described later, and the annular space S 2 (FIG. 7, FIG. (See FIG. 9), the annular space S2 can be reliably cleaned, and the outlet port 3 of the cartridge-side cleaning fluid passage 36 can be reliably cleaned. 6B, as shown in FIG. 6, opens on the opposite side of the groove 38, which will be described later, radially across the axis center position of the cylinder 23 (position on the axis 01-Ol). It is arranged. As a result, In the cleaning fluid passage 36, the cleaning fluid discharged into the paint storage chamber 26 is divided into the left side and the right side in the circumferential direction as shown by the arrow in FIG. As a result, the cleaning space S can be uniformly cleaned over the entirety.

Reference numeral 37 denotes a cleaning fluid valve provided at the back of the female connection portion 23E of the cylinder 23, and the cleaning fluid valve 37 is configured as a type of check valve. Here, as shown in FIG. 5, the cleaning fluid valve 37 is provided with a valve case 37A in which a valve seat 37B is formed, and a valve seat 37B located in the valve case 37A. It is composed of a valve body 37 C that separates and seats, and a valve spring 37 D that urges the valve body 37 C in the valve closing direction. The cleaning fluid valve 37 always closes the valve seat 37B with the valve element 37C to prevent the paint in the paint chamber 26 from leaking out of the cleaning fluid passage 36. To prevent. On the other hand, when the cleaning thinner and the cleaning air are supplied from the cleaning fluid passage 52 on the filling table side, the valve element 37C is opened against the valve spring 37D, and the cleaning fluid on the cartridge side is opened. The cleaning thinner and cleaning air are supplied to the paint chamber 26 through the passage 36.

Reference numeral 38 denotes a concave groove provided on the bottom surface 23A of the cylinder 23. The concave groove 38 is located near the center of the axis of the cylinder 23 as shown in FIG. (Near 1) toward the inner peripheral surface 23 C in a concave shape. Here, as shown in FIG. 6, the concave groove 38 is formed as a long groove having a substantially constant width dimension W and a length dimension L extending in the radial direction of the cylinder 23. The width dimension W of the concave groove 38 is set to, for example, a narrow width that is substantially the same as the hole diameter dimension of the cylinder-side passage portion 31 of the paint passage 29. Further, the concave groove 38 is located at the deepest deepest position 38 A 1 at the middle part in the length direction (in the specific example, at a position about 2/3 of the length L from the axial center position). It has a groove bottom 38 A which is inclined so that Further, the deepest position 38 A 1 is a position deeper by the depth dimension H than the deepest portion 23 A 1 of the bottom surface 23 A of the cylinder 23. At the groove bottom 38 A of the concave groove 38, an opening 31 A of the cylinder-side passage portion 31 on the side of the paint storage chamber is opened at the deepest position 38 A 1 (see FIG. 8).

A concave groove 38 extending in the radial direction forms a bottom space S between the cleaning fluid passage 36 and the bottom surface 23 A of the cylinder 23 and the front end surface 25 A of the piston 25. A cleaning fluid is supplied to 1, and the cleaning fluid flowing so as to extend this bottom space S 1 flows together with the washed paint at a stretch. As a result, the cleaning fluid can flow uniformly over the entire surface via the bottom space S1, and the attached paint can be efficiently cleaned.

The cleaning fluid that has flowed into the groove 38 smoothly flows into the paint passageway 29 (cylinder side passageway 31) opened at the groove bottom 38A of the groove 38, and the cleaning fluid flows into the feed tube side. It can be discharged to the outside via the passage 30 or the like.

Next, a paint filling apparatus for filling the cartridge 21 with paint and cleaning the cartridge 21 will be described.

4 1 a, 4 1 b, · '· 4 1 η and 4 1 p are a color, b color, ...! ! This is a paint filling device provided for each color and other paints (hereinafter referred to as a paint filling device 41 as a whole). Here, the paint filling device 4 1a, 4 1b, "'4 1111 is a special color with relatively high frequency of painting, a color, b color, etc. !! 1 Filling the bridges 2 1 a, 2 1 b, · 2 · In The paint filling unit 41 p is used to fill paint with a low frequency of painting with one painting car. It fills the trigger 21p while changing colors. The paint filling device 41 is generally constituted by a filling table 42, a connecting member 48, and the like, which will be described later.

The detailed configuration of the paint filling device 41 is the same as the configuration described in Japanese Patent Application Laid-Open No. 2002-113396 previously filed. That is, in the paint filling device 41, a painting cartridge 21 is attached to a filling table 42 described later, and in this state, the painting cartridge 21 is connected to a paint supply source, a cleaning fluid supply source, and the like. By connecting to a waste liquid tank or the like (neither is shown), paint filling and cleaning are performed.

Reference numeral 42 denotes a filling table which constitutes the paint filling device 41a, 41b, -41η, 41 1. Here, the filling table 42 is provided with a leg 43, a column 44 extending upwardly and downwardly from the leg 43, and a larger diameter of the upper side of the column 44. The pedestal part 45 is roughly constituted.

Reference numeral 46 denotes a filling tube side feed tube extending through the column portion 44 of the filling table 42 in an upward and downward direction. The feed tube through hole 46 has a coating card. The feed tube 24 of the bridge 21 is fitted in the through state.

Reference numeral 47 denotes a cylinder support provided on the pedestal portion 45. The cylinder support 47 is provided with the cylinder 23 of the coating cartridge 21 and is provided on the filling table side. The feed tube is formed in a concave cylindrical shape on the opening side of the through hole 46. Also, as shown in FIG. 5, the bottom 47 of the cylinder support portion 47 has a female connection portion 47 with which the male connection portion 23D of the cylinder 23 fits, and a cylinder connection portion 43 with the female connection portion 47 of the cylinder 23. The male connection part 47 C fitted with the female connection part 23 Ε is formed separately.

Reference numeral 48 denotes a connecting member provided at the back of the feed tube through hole 46, and the connecting member 48 includes a feed tube 2 It is connected to the tip of 4. The connecting member 48 is connected to a paint supply source, a waste liquid tank, and the like (neither is shown) via a paint hose 49 and a switching valve.

Reference numeral 50 denotes an extruding thinner passage on the filling table side forming an extruding liquid passage provided on the base portion 45 of the filling table 42 so as to be connectable to the extruding thinner storage chamber 27 of the cartridge 21. One end of the passage 50 is open to the female connection portion 47B of the cylinder support portion 47, and the other end is connected to an extruded thinner supply / discharge valve (not shown) via the thinner hose 51. Have been.

Reference numeral 52 denotes a cleaning fluid passage on the filling table side provided in the pedestal portion 45 of the filling table 42.One end of the cleaning fluid passage 52 is connected to a cleaning thinner and cleaning air via a cleaning fluid hose 53. It is connected to a cleaning fluid supply valve (not shown) that supplies alternately or simultaneously. The other end of the cleaning fluid passage 52 is opened at the tip end surface of the male connection portion 47 C of the cylinder support portion 47 so as to correspond to the cartridge-side cleaning fluid passage 36.

The pedestal portion 45 of the filling table 42 is provided with another pilot air passage, such as a pilot air passage for supplying a pilot valve for opening the paint valve 32 of the painting power grid 21. A plurality of passages (not shown) are provided.

The cartridge type coating system according to the present embodiment has the configuration as described above. Next, the coating operation using the coating cartridge 21, the filling operation of the paint, and the cleaning operation are performed. explain about.

First, the painting operation when painting is performed using the painting apparatus 1 will be described. The paint cartridge 21 filled with paint in the paint chamber 26 is attached to the cartridge mounting part 4 of the housing 2 as shown in Fig. 2, and the thinner valve 1 5. Open the paint valve 3 2. And extrusion By supplying the extruded thinner to the extruded thinner storage chamber 27 through the thinner passages 13 and 34, the piston 25 is displaced in the direction in which the paint storage chamber 26 is reduced. Thus, the paint in the paint storage chamber 26 is discharged from the tip of the feed tube 24 to the rotary atomizing head 8 through the concave groove 38 and the paint passage 29. In addition, the rotary atomizing head 8 rotationally atomizes the paint supplied from the feed tube 24 and sprays it toward the object to be coated.

Next, a description will be given of a filling operation in the case where the paint is filled into the paint power cartridge 21 emptied by the painting work. First, after the painting operation is completed, the painting cartridge 21 is removed from the force cartridge mounting portion 4 of the housing 2 and, as shown in FIG. Attach it to the cylinder support part 4 7 provided in 2. By opening the paint valve 32 in this state, the paint from the paint supply source flows into the tip of the feed tube 24 through the paint hose 49 and the connecting member 48, and the paint passage is opened. 29, the paint is filled into the paint chamber 26 through the concave groove 38.

On the other hand, for example, when the cartridge type painting system is stopped for maintenance work, a long vacation, etc., or when painting is performed while changing colors using a common painting cartridge 21p. If this is done, the paint remaining in the paint storage chamber 26, paint passage 29, etc. of the coating cartridge 21 is discharged, and the paint adhering to the paint storage chamber 26, etc. is washed. There is a need.

Therefore, a cleaning operation for cleaning the paint adhering to the paint accommodating chamber 26, the paint passage 29, etc. of the painting cartridge 21 will be described with reference to FIG. 4 to FIG.

First, similar to the paint filling | The completed coating cartridge 21 was removed from the power cartridge mounting portion 4 of the housing 2 and installed on the filling table 42 of the coating device 41 as shown in FIG. Attach to cylinder support 4 7.

Next, after the paint valve 32 is opened, the extruded thinner is supplied from the extruded thinner supply / discharge valve to the extruded thinner accommodating chamber 27 via the thinner hose 51 and the extruded thinner passages 50 and 34. The piston 25 is displaced so that its front end face 25 A contacts the bottom face 23 A of the cylinder 23. As a result, the excess paint in the paint storage chamber 26 can be returned to the paint supply source side through the concave groove 38, the paint passage 29, the connecting member 48, the paint hose 49, and the like. .

At this time, since the concave groove 38 is formed as a narrow long groove having the width dimension W, the surface area of the concave groove 38 is reduced to reduce the surface to be cleaned. can do. Further, the concave groove 38 can reduce the amount of paint remaining in the concave groove 38, and can suppress wasteful disposal of paint.

When the paint in the paint storage chamber 26 is discharged, a small amount of the extruded thinner flows out of the extruded thinner storage chamber 27 so as to remove the residual pressure in the extruded thinner storage chamber 27.

Then, the paint in the paint storage chamber 26 is returned, and the extruded thinner in the extruded thinner storage chamber 27 is slightly discharged, and as shown in Fig. 5, the washing fluid valve 37 is opened while the washing is performed. The cleaning fluid is supplied to the paint chamber 26 through the cleaning fluid hose 53 and the cleaning fluid passages 52 and 36. As a result, the bistone 25 can be moved out of the extrusion thinner storage chamber 27 by the amount that the extrusion thinner in the extrusion thinner storage chamber 27 slightly flows out. Therefore, a cleaning space S is formed between the bottom surface 23A of the cylinder 23 and the front end surface 25A of the piston 25 so that the cleaning fluid can spread and flow therethrough. Can be.

Here, since the bottom surface 23 A of the cylinder 23 is formed in a concave conical shape, the cleaning thinner and paint are gathered centrally along the bottom surface 23 A, and the groove 3 8 side without being left Can be shed. Further, since the front end face 25A of the piston 25 is formed in a convex conical shape, the bottom space S1 formed between the bottom face 23A of the cylinder 23 and the bottom space S1 has a uniform clearance dimension. It can be formed.

In this manner, the cleaning fluid supplied from the cleaning fluid passage 36 to the bottom space S 1 spreads through the bottom space S 1 as shown by the arrow in FIG. Clean the paint adhering to the front end surface 25A of 5 and the bottom surface 23A of the cylinder 23. The washing fluid thus washed flows into the concave groove 38, and the cylinder side passage 31 of the paint passage 29, the feed tube side passage 30, the connecting member 48, and the paint hose 49 Is discharged to the waste liquid tank via

At this time, the cleaning fluid flowing through the bottom space S1 can quickly flow into the long groove-shaped concave groove 38 which extends in the radial direction and opens greatly, so that the cleaning fluid passes through the bottom space S1. As a result, the paint can be distributed evenly over the entire surface, and the adhered paint can be washed efficiently.

The outlet 36B of the cleaning fluid passage 36 on the cartridge side is opened on the opposite side of the radial direction from the concave groove 38 across the axial center of the cylinder 23. Numeral 8 extends from the vicinity of the center of the cylinder 23 to the inner peripheral surface 23C with a length L. As a result, the cleaning fluid supplied from the cleaning fluid passage 36 to the bottom space S1 is outside the bottom space S1. It can be evenly distributed on the circumferential and center sides without any tightness, and the paint adhering to the front end face 25 A of piston 25 and the bottom face 23 A of cylinder 23 can be reliably washed. Can be.

Further, the cartridge-side cleaning fluid passage 36 is inclined radially outward so that the outlet port 36B is located near the inner peripheral surface 23C of the cylinder 23. Has formed. For this reason, as shown in FIG. 9, a part of the cleaning fluid supplied from the cleaning fluid passage 36 is transferred to the inner peripheral surface 23 C of the cylinder 23 and the outer peripheral surface 25 C of the piston 25. Into the small annular space S2 between the two. The cleaning fluid that has flowed into the annular space S2 flows along the annular space S2 as shown by the arrows in FIGS. 6 and 8, and reliably cleans the paint remaining in the annular space S2. Can be. Further, the cleaning fluid that has washed the inside of the annular space S2 flows into the bottom space S1, and can be discharged together with the washing fluid that has washed the bottom space S1.

Thus, according to the present embodiment, the bottom surface 23 A of the cylinder 23 extends from the vicinity of the axial center position of the cylinder 23 toward the inner peripheral surface 23 C in a concave shape. A concave groove 38 is provided, and the cylinder side passage part 31 of the paint passageway 29 has its paint storage chamber side opening 31A at the deepest position 38A of the groove bottom 38A of the groove 38. It is configured to open to 1. Thus, when the cleaning fluid is supplied to the cleaning space S from the cleaning fluid passage 36 on the power grid side, the cleaning fluid can flow evenly over the entire surface via the bottom space S1. it can. Further, the cleaning fluid that has entered the concave groove 38 can be smoothly discharged to the outside through the paint passage 29.

As a result, the cleaning fluid can uniformly flow through the entire bottom space S1. Therefore, this cleaning fluid The paint adhered to the bottom 23 A of 23, the front end 25 A of piston 25, etc. can be efficiently cleaned with a small amount in a short time. The volume and cleaning time can be reduced, and workability and reliability can be improved.

In addition, since the cartridge side cleaning fluid passage 36 is formed such that its outlet 36B is inclined radially outward toward the inner peripheral surface 23C of the cylinder 23, The cleaning fluid passage 36 must allow the cleaning fluid to flow actively into the small annular space S2 between the inner peripheral surface 23C of the cylinder 23 and the outer peripheral surface 25C of the bistone 25. Can be. As a result, the paint remaining in the annular space S2 can be reliably cleaned, and the amount of cleaning fluid and the cleaning time required for the cleaning operation can be further reduced.

Also, since the cartridge side cleaning fluid passage 36 is opened radially opposite to the concave groove 38 with respect to the axial center position of the cylinder 23, as shown in FIG. The cleaning fluid supplied to the cleaning space S from the cleaning fluid passage 36 is equally distributed to the left and right in the circumferential direction toward the concave groove 38. As a result, the cleaning fluid can be circulated on the radially outer peripheral side and intermediate portion of the bottom space S1, and the entire surface including the paint adhered to these portions can be efficiently cleaned.

On the other hand, since the bottom surface 23A of the cylinder 23 is formed in a concave conical shape, the cleaning thinner and paint are collected at the center along the bottom surface 23A and flow to the groove 38 without leaving. Cleaning efficiency can be improved. Further, since the front end face 25A of the piston 25 is formed in a convex conical shape, the bottom space S1 formed between the piston 23 and the bottom face 23A of the cylinder 23 has a uniform clearance dimension. This bottom space S 1 Cleaning thinner can be supplied to the whole to perform efficient cleaning work.

Further, since the concave grooves 38 are formed as narrow narrow grooves having a constant width dimension W, the number of surfaces to be cleaned can be reduced, and the cleaning time can be shortened. Further, the amount of paint remaining in the concave groove 38 can be reduced, and the paint can be prevented from being wasted.

In addition, the cylinder side passage portion 31 of the paint passageway 29 provided in the coating cartridge 21 is bent so as to avoid the paint valve 32, and one end is positioned at the center of the cylinder shaft. It is formed so as to be connected to the concave groove 38 at a position eccentric to the outer peripheral side from the position. As a result, the paint passage 29 has two drilling operations (drilling): an oblique drilling process communicating with the feed tube side passage unit 30 and an axial drilling process communicating with the concave groove 38. ) Can be easily formed and the manufacturing cost can be reduced.

Next, FIG. 10 shows a second embodiment of the present invention. A feature of the present embodiment is that a diameter-enlarged annular groove is provided on the inner peripheral surface of the cylinder, the diameter of which is increased over the entire circumference at a position adjacent to the bottom surface. Note that, in the present embodiment, the same components as those in the above-described first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

6 1 is an enlarged-diameter annular groove provided on the inner peripheral surface 23 C of the cylinder 23 adjacent to the bottom surface 23 A. The enlarged-diameter annular groove 61 is a bottom surface of the inner peripheral surface 23 C. It is formed by expanding the diameter adjacent to 23 A over the entire circumference. The enlarged annular groove 61 is used to supply the cleaning fluid discharged from the outlet 36 B of the cartridge-side cleaning fluid passage 36 to the piston 23 and the inner peripheral surface 23 C of the cylinder 23. 25 outer peripheral surface 25 C and seal ring A peripheral opening is formed to positively supply the annular space S2 between the openings 28 and 28. Here, the enlarged diameter annular groove 6 1 is

Position close to the bottom surface of 3 C (inner surface 23 C and bottom surface)

At the boundary with 23 A), so that it does not interfere with the seal ring 28 provided on the piston 25. Thus, in the present embodiment configured as described above, it is possible to obtain substantially the same operation and effect as those of the above-described first embodiment. In particular, according to the present embodiment, the enlarged annular groove 61 is formed in the annular space S2 between the inner peripheral surface 23C of the cylinder 23 and the outer peripheral surface 25C of the piston 25. The inlet portion into which the cleaning fluid flows from the cleaning fluid passage 36 can be formed as a large opening around the entire circumference. For this reason, the cleaning fluid can positively flow into the annular space S2 through the entire peripheral opening, and can be reliably washed without leaving the paint in the annular space S2.

Next, FIGS. 11 and 12 show a third embodiment of the present invention. A feature of the present embodiment is that a cutout for guiding the cleaning fluid toward the center of the cylinder axis is provided at the opening of the cleaning fluid passage on the side of the paint containing chamber. In this embodiment, the same components as those in the above-described first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

Reference numeral 71 denotes a cutout provided in the opening on the outlet 36B side of the cleaning fluid passage 36 on the power grid side. The cutout 71 is provided with a cylinder as shown in FIG. It guides the cleaning fluid toward the axial center 0 1—〇 1 of axis 23. Here, the notch 71 is located between the outlet 36 B of the cleaning fluid passage 36 and the bottom surface 23 A of the cylinder 23 and a portion close to the center of the shaft (the inner peripheral surface 2 A).

3C is cut out in an arc shape. It is better formed.

Numeral 72 denotes an enlarged-diameter annular groove provided on the inner peripheral surface 23C of the cylinder 23. The enlarged-diameter annular groove 72 is similar to the enlarged-diameter annular groove 61 according to the second embodiment. It is formed by expanding the diameter adjacent to the bottom surface 23A over the entire circumference. The enlarged-diameter annular groove 72 forms a full-peripheral opening for positively flowing the cleaning fluid discharged from the cartridge-side cleaning fluid passage 36 into the annular space S2.

Thus, in the present embodiment configured as described above, it is possible to obtain substantially the same operation and effect as those of the above-described first embodiment. In particular, according to the present embodiment, since the cutout 71 is provided at the outlet 36B of the cleaning fluid passage 36 on the power ridge, the cutout 71 is cleaned in the bottom space S1. The fluid can be circulated so as to be guided toward the axial center 0 1 _ 0 1 side of the cylinder 23. In addition, since the enlarged annular groove 72 allows the cleaning fluid to flow into the annular space S2, the entire washing space S from the center of the bottom space S1 to the annular space S2 on the outer peripheral side is efficiently used. In each embodiment, the cleaning fluid valve 37 always closes the cartridge-side cleaning fluid passage 36 and the cleaning fluid passage 52 from the filling-table-side cleaning fluid passage 52. The check valve is configured to open the cartridge-side cleaning fluid passage 36 when the cleaning air is supplied. However, the present invention is not limited to this. For example, as shown in a first modified example shown in FIG. 13, the pilot air for opening and closing the cartridge-side cleaning fluid passage 36 ′ by the pilot air. A cleaning fluid valve 81 composed of an on-off valve may be provided.

Here, a pilot air type cleaning fluid valve 81 is disclosed in It has the same configuration as that described in Japanese Patent Application Laid-Open No. 2002-111396. That is, the cleaning fluid valve 81 includes a cylinder hole 81A, a piston 81B slidably fitted in the cylinder hole 81A, and a car extending from the piston 81B. The valve element 81C for opening and closing the cleaning fluid passage 36 'on the trigger side, the valve spring 81D for urging the valve element 81C in the valve closing direction, and the pilot air are supplied. Therefore, it is substantially constituted by a pilot air chamber 81E for opening the valve body 81C against the valve spring 81D.

Further, in each embodiment, the concave groove 38 provided on the bottom surface 23A of the cylinder 23 has a substantially constant width dimension W and is formed as a long groove extending in the radial direction of the cylinder 23. This is explained using an example. However, the present invention is not limited to this. For example, as shown in a second modified example shown in FIG. 14, an elliptical groove 91 that opens in an elliptical shape is formed on the bottom surface 23 A of the cylinder 23. It may be configured to be installed. Further, the concave groove may have another shape such as a circle or a triangle.

Further, in each embodiment, the deepest position 38 A 1 of the groove bottom 38 A of the groove 38 is defined as an intermediate portion of the length dimension of the groove 38, and the length from the axis center position is It is set at a position about 2 Z 3 away from the dimension L, and the opening 31 A of the paint chamber side of the cylinder side passage 31 is opened. However, the present invention is not limited to this, and the deepest position 38 A 1 of the groove bottom 38 A may be set, for example, at a position about 1 Z 2 of the length L away from the axis center position. .

In each embodiment, the cartridge-side cleaning fluid passage 36 is formed so as to be inclined radially outward with respect to the axis 01-O1 of the cylinder 23. However, the present invention is not limited to this. 6 may be arranged substantially in parallel with the axis 0 1 _ 0 1 of the cylinder 23, and only the outlet 36 B may be inclined radially outward. Further, the entire cartridge-side cleaning fluid passage 36 may be formed to be curved, so that the position of the outlet 36B may be inclined outward in the radial direction.

Further, in each embodiment, an example is given in which the bottom surface 23 A of the cylinder 23 is formed in a concave conical shape and the front end surface 25 A of the piston 25 is formed in a convex conical shape. explained. However, the present invention is not limited to this. For example, the bottom surface 23 A of the cylinder 23 and the front end surface 25 A of the piston 25 may be formed in other shapes such as a flat surface. .

On the other hand, in each of the embodiments, the case where the piston 25 is used as the movable partition has been described as an example. However, the present invention is not limited to this. For example, the present invention is not limited to a diaphragm, a bellows, and the like. The movable partition may be used.

Further, in each embodiment, the case where the rotary atomizing head type coating device 1 is attached to the tip of the wrist 105 of the coating port 101 is described as an example, but the present invention is not limited to this. The present invention is not limited to this. For example, a configuration may be adopted in which the coating apparatus 1 is mounted on another coating work machine such as a reciprocator.

Further, in each embodiment, the case where thinner is used as the extruding liquid has been described as an example. However, the present invention is not limited to this, and the type of paint, the method of applying high voltage, etc. Accordingly, another extrusion liquid such as water may be applied.

Claims

The scope of the claims

1. A body having a hollow cylinder extending in the axial direction, a feed tube extending in the axial direction from the cylinder, a paint chamber for accommodating paint in the cylinder of the body, and an extruding liquid flowing in and out. A movable partition defined in an extruding liquid accommodating chamber, and a paint passage communicating with the paint accommodating chamber and a tip end of a feed tube, through which a paint valve discharges and fills the paint. An extruding liquid passage provided in the body, through which the extruding liquid flows into and out of the extruding liquid storage chamber when the paint is discharged and filled through the coating passage; and a cleaning fluid valve provided in the body. A cleaning fluid passage through which a cleaning fluid is supplied to the paint storage chamber.

On the bottom surface in the cylinder, a concave groove formed in a concave shape extending radially from the vicinity of the axial center position of the cylinder toward the inner peripheral surface is provided,

The paint passage, wherein the paint passage side opening of the paint passage is opened at the bottom of the concave groove.

2. The coating according to claim 1, wherein the outflow-side opening of the cleaning fluid passage is formed to be inclined radially outward with respect to the axis of the cylinder so as to open toward the inner peripheral surface of the cylinder. Wearing cartridge.

3. The coating according to claim 1 or 2, wherein the outflow side opening of the cleaning fluid passage is opened at a bottom surface inside the cylinder on a side radially opposite to the concave groove with respect to an axial center position of the cylinder. Wearing cartridge.

4. On the inner peripheral surface of the cylinder, the position adjacent to the bottom 2. An annular groove having an enlarged diameter extending over the entire circumference.

Cartridge for painting as described in 1, 2 or 3

5. The coating according to any one of claims 1, 2, 3, and 4, wherein a cutout portion for guiding the cleaning fluid toward the center of the shaft of the nozzle is provided at an outlet side opening of the cleaning fluid passage. Utility tridle.

6. The movable partition is a piston that is displaced in the axial direction along the inner peripheral surface of the cylinder, and the bottom surface of the cylinder is formed in a concave conical shape in which the axial center position of the cylinder is the deepest part, The coating force according to any one of claims 1, 2, 3, 4 and 5, wherein the end face of the piston facing the bottom face of the cylinder is formed in a convex conical shape in which the axial center position of the cylinder is a protruding end. Tridge.

7. The bottom surface of the cylinder is formed in a concave conical shape in which the axial center position of the cylinder is the deepest portion, and the opening of the paint passage on the side of the paint chamber is the concave groove at a position deeper than the deepest portion of the bottom surface of the cylinder. The coating cartridge according to claim 1, 2, 3, 4, or 5, wherein the coating cartridge has an opening at the bottom of the groove.

8. The coating car according to claim 1, 2, 3, 3, 4, 5, 6, or 7, wherein the concave groove is formed as a long groove or an elliptical concave groove extending in a radial direction of the cylinder. Tridge.

9. The concave groove is formed as a long groove or an elliptical concave groove extending in the radial direction of the cylinder, and the groove bottom of the concave groove is a deepest deepest position at an intermediate portion in the length direction. A coating power trit according to any one of Items 1, 2, 3, 4, 5, 6, and 7.

10. The coating cart according to claim 1, wherein the concave groove is formed as a long groove having a substantially constant width dimension and extending in a radial direction of the cylinder. 10. Lidge.