JP2009248052A - Coating cartridge - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the discharge of the excess molten material to a space in the bag body by stagnating the discharge of an excess molten material produced when a bag body is heated and fused to a support part of a bag like tank. <P>SOLUTION: The support part 23 of the bag-like tank 22 is formed from a melting resin material, a circular small-diameter fusing part 29 for fusing an opening 24A side of an inner bag 24 is provided on the outer peripheral surface of a small diameter part 23A of the support part 23 and a circular large-diameter fusing part 31 for fusing the opening 25A side of an outer bag 25 is provided on the outer peripheral surface of a large diameter part 23B. Molten material traps 30A, 30B are provided at a position adjacent to the small-diameter fusing part 29 and a molten material trap 32 is provided at a position adjacent to the large-diameter fusing part 31. As a result, the excess molten materials 34, 35 run over from a fused surface between the support part 23 and the inner bag 24, outer bag 25 are stored in the molten material traps 30A, 30B and the molten material trap 32. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a coating cartridge for supplying, for example, a coating material which is attached to a coating machine by being exchanged and filled in the coating machine.

  In general, it is desired that a coating system that coats an object to be coated such as a body of an automobile can reduce the amount of paint discarded at the time of color change and can cope with many paint colors. As a coating system corresponding to this, there is known a cartridge type coating system in which a coating cartridge filled with a paint for each color is replaced and attached to a coating apparatus every time an object is coated. (For example, refer to Patent Document 1).

JP 11-262699 A

  In addition, the coating cartridge of Patent Document 1 is detachably attached to a coating apparatus, and includes a cylindrical hollow tank, a body that includes a feed tube extending axially forward from the tank, and a tank for the body. A piston which is movably disposed in the axial direction and defines a paint storage chamber and an extrusion liquid storage chamber in the tank, a paint passage formed from the paint storage chamber through a feed tube, and the extrusion This is generally constituted by an extrusion liquid passage for supplying and discharging the extrusion liquid to and from the liquid storage chamber.

  In Patent Document 1, high dimensional accuracy and smooth finishing are required for processing the inner surface of the tank to slide the piston, and expensive seal members are periodically replaced to maintain liquid tightness. It must be done and maintenance costs increase.

  Therefore, the coating cartridge attached to the coating machine accommodates the image forming unit in a cylindrical tank body instead of the sliding piston, and supplies the extrusion liquid into the image forming film. There is a configuration in which a coating material filled between the image forming film and the tank body is discharged toward a coating machine (see, for example, Patent Document 2).

JP 2006-187732 A

  Further, in the image forming unit according to Patent Document 2, the coating film containing chamber is defined between the tank main body and the image forming film by fixing the opening side of the image forming film to the base fixed in the tank main body. In addition, an extruded liquid storage chamber is defined in the image forming film.

  By the way, as in Patent Document 2 described above, when the image forming film opening side is fixed to the base, it is conceivable to fix the base using an adhesive. However, in the painting operation, there is a possibility of coming into contact with paints and extrusion liquids containing various organic solvents, and therefore organic solvent-based adhesives that dissolve by contact cannot be used. In addition, it is conceivable to fix the opening side of the image forming film from the outer periphery using a retainer ring or the like, but a space for providing the retainer ring or the like is separately required.

  Therefore, in a coating cartridge that may come into contact with an organic solvent and it is difficult to secure a space, means for melting and fixing by heat (hereinafter referred to as thermal welding) is used, and the opening side of the bag body is covered with a lid. It is performed to weld to the outer peripheral surface of the supporting part. In this thermal welding, an annular welded portion that melts for fixing is provided on the outer peripheral surface of the support portion, and the opening side of the bag body is disposed so as to surround the welded portion. And by pressing the heated pressing tool against the welded portion with the opening side of the bag sandwiched between the welded portion and the welded portion, the surface side of the welded portion is melted to fix the bag to the support portion. Can do.

  However, when the support portion and the bag body are fixed by thermal welding, excess melt that has not contributed to welding is eluted from between the welding surfaces and solidifies. And when a molten material oozes out to the inner side of a bag body, a bag body may be damaged by the part which leached out. In particular, since the excess melt is formed inside the thermally welded bag body, there is a problem that the bag body is damaged because it cannot be taken out due to its structure.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to accumulate excess melt when the bag body is thermally welded to the support portion of the bag-shaped tank, and to store the space in the bag body. An object of the present invention is to provide a coating cartridge which is prevented from being eluted.

  The coating cartridge according to the present invention is composed of a base member having a paint tube on one side and a tank mounting portion on the other side across a main body portion attached to the spraying means, and a bottomed cylindrical body having an open front end. A tank housing cylinder whose side is detachably attached to the tank mounting portion of the base member, a support portion supported between the tank mounting portion of the base member and the tank housing cylinder, and a flexible material. A bag-like tank having a bottom with an open front end, and a bag-like tank having a front end fixed to the support portion and defining a space in the bag.

  In order to solve the above-mentioned problem, the feature of the configuration of the invention of claim 1 is that the support portion of the bag-like tank is formed of a meltable resin material, and the support portion of the bag-like tank is In addition, an annular weld portion for welding the front end side of the bag body using a thermal welding means is provided on the outer peripheral surface, and a position adjacent to the weld portion on the outer peripheral surface of the support portion, It is set as the structure which provided the melt pool which accumulates the excess melt which will dig out when welding the front-end side of the said bag body to the said welding part.

  The invention of claim 2 is configured such that the melt pool is provided at least on the side close to the internal space of the bag body, on both sides in the length direction of the welded portion provided on the support portion of the bag-like tank. It is in.

  According to a third aspect of the present invention, the melt pool is an all-around groove formed on the outer peripheral surface of the support portion over the entire circumference.

  According to a fourth aspect of the present invention, the outer peripheral surface of the support portion of the bag-shaped tank has a small-diameter weld on the side close to the internal space of the bag body and a large-diameter weld on the side away from the internal space. The bag body of the bag-like tank is formed in a stepped shape, and is welded using the small-diameter weld portion, and the outer bag is welded using the large-diameter weld portion so as to cover the inner bag. The melt pool is provided at a position adjacent to the small diameter welded portion and a position adjacent to the large diameter welded portion.

  According to the invention of claim 1, the support portion of the bag-like tank is formed of a meltable resin material, and the front end side of the bag body is welded to the outer peripheral surface of the support portion of the bag-like tank using the heat welding means. An annular welded portion is provided for this purpose. And it is set as the structure provided in the position adjacent to the welding part among the outer peripheral surfaces of a support part that the excess melt which will be poured out when the front end side of a bag body is welded to a welding part is stored.

  Therefore, when fixing a bag body to the outer peripheral surface of a support part using heat welding, the front-end side of a bag body is arrange | positioned so that the cyclic | annular welding part provided in the outer peripheral surface of a support part may be enclosed. And by pressing the heated pressing tool against the welded portion with the front end side of the bag sandwiched between the welded portion and the welded portion, the surface side of the welded portion is melted and fixed in a liquid-tight manner. Can do.

  In this heat welding operation, of the melt generated when the welded portion melts, the excess melt that did not contribute to the weld between the support portion and the bag body is eluted from between the welded surfaces of the support portion and the bag body. Solidify. At this time, since the melt pool is provided at a position adjacent to the welded portion, the excess melted out can be stored (stored) in the melt pool.

  As a result, it is possible to prevent the bag body of the bag-like tank from being damaged by the excess melt that protrudes from between the welding surfaces of the support portion and the bag body, thereby extending the life of the bag body and improving the reliability. Can do.

  According to the invention of claim 2, when the melt pool is provided on the side close to the inner space of the bag body on both sides in the length direction of the welded portion provided on the support portion of the bag-like tank, It is possible to reliably prevent the melt from entering the inner space of the.

  According to the invention of claim 3, since the melt pool is an all-around groove formed on the outer peripheral surface of the support portion over the entire circumference, most of the excess melt generated during heat welding is melted. Can be stored in a pool.

  According to the invention of claim 4, when the inner bag of the bag body is welded to the small-diameter welded portion of the support portion, it is possible to store excess melt in the melt reservoir provided adjacent to the small-diameter welded portion. Further, when the outer bag of the bag body is welded to the large-diameter welded portion of the support portion, excess melt can be stored in the melt reservoir provided adjacent to the large-diameter welded portion. Thereby, the bag body of the double structure which consists of an inner bag and an outer bag can be thermally welded to the outer peripheral surface of a step-shaped support part, respectively.

  Hereinafter, the case where the coating cartridge according to the embodiment of the present invention is applied to a rotary atomizing head type coating apparatus will be described as an example, and will be described in detail with reference to FIGS.

  In FIG. 1, reference numeral 1 denotes a rotary atomizing head type coating apparatus (hereinafter referred to as a coating apparatus 1) that forms spraying means provided in an operating machine (not shown) such as a painting robot. The coating apparatus 1 includes a housing 2 having a motor mounting portion 2A on the front side and a cartridge mounting portion 2B on the rear side, an air motor 3 mounted in the motor mounting portion 2A of the housing 2, and rotationally driven by the air motor 3. A rotating shaft 4 which is attached to the front end side of the rotating shaft 4 and rotates to atomize and atomize the paint to be atomized and spray toward the object to be coated, and a cartridge mounting portion of the housing 2 The feed tube insertion hole 6 is provided so as to penetrate from the center of 2B to the tip of the rotating shaft 4.

  In addition, the housing 2 is provided with a high voltage generator 7 configured by, for example, a cockcroft circuit and boosting a voltage supplied from a power supply device (not shown) to −60 to −120 kV. The high voltage generator 7 applies a high voltage to the rotary atomizing head 5 via, for example, the air motor 3 and the rotary shaft 4 to directly charge the paint.

  Further, the housing 2 is provided with a housing-side extruded liquid passage 8 through which the extruded liquid circulates. In the middle of the extruded liquid passage 8, an extrusion that supplies and stops the extruded liquid to a coating cartridge 11 described later. A liquid valve 9 is provided.

  Next, the coating cartridge 11 according to this embodiment that is replaceably attached to the coating apparatus 1 will be described.

  That is, reference numeral 11 denotes a coating cartridge that is detachably attached to the cartridge attachment portion 2B of the housing 2. A plurality of coating cartridges 11 are prepared for replacement, for example, on a filling stand (not shown) of the coating material filling apparatus. The plurality of cartridges 11 are used exclusively for each of a plurality of types (plural colors) of paints.

  As shown in FIG. 2, the coating cartridge 11 includes a base member 12, a tank housing cylinder 20, a bag-like tank 22, a paint housing chamber 26, an extruded liquid housing chamber 28, welded portions 29 and 31, and a melt. This is roughly constituted by the reservoirs 30A, 30B, 32 and the like.

  Reference numeral 12 denotes a base member serving as a mounting base for the coating cartridge 11. The base member 12 has a main body portion 13 described later formed in a short cylindrical shape, and the front side is a feed tube 14 and the rear side is a tank mounting portion 16 across the main body portion 13.

  Reference numeral 13 denotes a main body portion of the base member 12, and the main body portion 13 is attached to the cartridge attachment portion 2 </ b> B of the housing 2. The main body portion 13 is formed in a short cylindrical shape, and a valve body accommodating space 13A for accommodating a paint valve 17 described later is formed in the central portion thereof. Further, a cartridge side extruded liquid passage 18 and a leaked liquid discharge passage 19 which will be described later are formed in the main body portion 13.

  The main body 13 is mounted in a fitting state in the cartridge mounting portion 2B of the housing 2 when the coating cartridge 11 is mounted on the coating device 1, and is filled when the coating cartridge 11 is mounted on the coating material filling device. It is mounted in a fitted state in a cartridge mounting portion (not shown) of the base.

  14 is a feed tube provided coaxially from the main body 13 toward the front side in the axial direction. A paint passage 15 described later is formed inside the feed tube 14 and a valve seat 14A is provided inside the tip. It has been. Here, the feed tube 14 discharges the paint supplied from the paint storage chamber 26 described later from the tip toward the rotary atomizing head 5 through the paint passage 15. The feed tube 14 is used as a paint filling port, and the paint can be filled into the paint containing chamber 26 from the feed tube 14.

  Reference numeral 15 denotes a paint passage provided in the feed tube 14. The paint passage 15 opens on the bottom surface 16 </ b> A of the tank mounting portion 16, which will be described later, on the rear side, which is the upstream side, and paints through the paint circulation hole 23 </ b> D of the support portion 23. It communicates with the storage chamber 26. On the other hand, the front side, which is the downstream side, opens at the tip of the feed tube 14. As a result, the paint passage 15 can allow the paint in the paint chamber 26 to flow out from the tip of the feed tube 14.

  Reference numeral 16 denotes a tank mounting portion provided on the rear side of the main body portion 13. The tank mounting portion 16 projects coaxially from the main body portion 13 toward the rear side in the axial direction, and is a short length in which a male screw is engraved on the outer peripheral side. It is formed as a cylinder. Further, the bottom surface 16 </ b> A (the rear surface portion of the main body portion 13) located in the back of the tank mounting portion 16 is formed substantially flat. An opening 20A of a tank housing cylinder 20 (to be described later) is inserted inside the tank mounting portion 16, and a retainer ring 21 is screwed on the outside.

  Reference numeral 17 denotes a paint valve provided in the main body 13, and the paint valve 17 is configured as a normally closed valve. The paint valve 17 includes a piston 17A fitted in the valve body accommodating space 13A of the main body 13 so as to be movable in the axial direction, a proximal end side attached to the piston 17A, and a distal end side corresponding to the distal end side of the feed tube 14 A long valve body 17B that extends in the axial direction to and from the valve seat 14A and a valve spring 17C that urges the piston 17A in the valve closing direction of the valve body 17B.

  The paint valve 17 normally blocks the paint passage 15 in the feed tube 14 by the valve body 17B being seated on the valve seat 14A by the urging force of the valve spring 17C. On the other hand, when pilot air is supplied, the piston 17A is displaced against the valve spring 17C, thereby opening the valve body 17B and allowing the paint passage 15 to communicate.

  Reference numeral 18 denotes a cartridge side extruded liquid passage provided in the main body 13. The extruded liquid passage 18 connects an extruded liquid storage chamber 28 to be described later to the housing side extruded liquid passage 8, and one end of the extruded liquid passage 18 opens to the front surface of the main body 13 at a position communicating with the housing side extruded liquid passage 8. Yes. A check valve 18 </ b> A that opens when attached to the housing 2 is provided on the front side of the extruded liquid passage 18. The other end of the extrusion liquid passage 18 is open to the bottom surface 16 </ b> A of the tank mounting portion 16 that is the rear surface of the main body portion 13.

  Reference numeral 19 denotes a leaked liquid discharge path provided in the main body 13, and the leaked liquid discharge path 19 opens a gap space 27 between an inner bag 24 and an outer bag 25 described later to the outside. Further, one end of the leaked liquid discharge path 19 communicates with a communication path 23F of the support portion 23 described later, and the other end opens to the outer peripheral surface (atmosphere) of the main body portion 13. At this time, the external opening of the leaked liquid discharge path 19 is opened at a position that is not blocked by a part of the housing 2 when the coating cartridge 11 is mounted in the cartridge mounting portion 2B of the housing 2.

  When the inner bag 24 is damaged and the paint in the paint storage chamber 26 leaks from the damaged portion of the inner bag 24 into the gap space 27, the leaked liquid discharge path 19 discharges the paint to the outside. This is a notification of breakage of the bag 24. Similarly, when the outer bag 25 is broken, the breakage of the outer bag 25 can be notified by discharging the extruded liquid leaking into the gap space 27 to the outside.

  Reference numeral 20 denotes a tank housing cylinder that is detachably attached to the tank mounting portion 16 of the base member 12, and this tank housing cylinder 20 forms a space of a predetermined volume around a bag-like tank 22 described later. . In addition, the tank housing cylinder 20 is made of, for example, a transparent or translucent resin material, specifically an acrylic resin, a vinyl chloride resin, a polyester resin, a polyamide (polyamide) so that the state of the bag-like tank 22 can be visually confirmed from the outside. It is made of PA, polyimide (PI), polyarylate (PAR), polycarbonate (PC), fluororesin (FR), cyclic olefin copolymer (COC) or the like.

  Further, the tank housing cylinder 20 is formed in a bottomed cylindrical shape by expanding the diameter of the front side to form a thick opening 20A and closing the rear side by the bottom 20B. Further, an inner circumferential stepped portion 20C that engages with a sandwiching enlarged diameter portion 23C on the outer peripheral side of the support portion 23 described later is formed on the inner side of the distal end portion of the opening portion 20A. Further, a stepped columnar holding portion 20D is formed in the center of the bottom portion 20B so as to protrude rearward, and the holding portion 20D is held when the coating cartridge 11 is conveyed.

  Reference numeral 21 denotes a retainer ring that detachably attaches the tank housing cylinder 20 to the tank attaching portion 16 of the base member 12. The retainer ring 21 is screwed to the tank mounting portion 16 in a state where the retainer ring 21 is engaged with the step portion of the opening 20A of the tank housing cylinder 20.

  Next, a bag-like tank that defines a space for storing paint and a space for storing extrusion liquid in the coating cartridge 11 will be described.

  A bag-like tank 22 is provided in the tank housing cylinder 20, and the bag-like tank 22 defines a paint chamber 26 and an extruded liquid chamber 28 which will be described later. Further, as shown in FIG. 4, the bag-like tank 22 is constituted by a support portion 23 to be described later, a double structure inner bag 24, and an outer bag 25.

  Reference numeral 23 denotes a support portion supported between the tank mounting portion 16 of the base member 12 and the tank housing cylinder 20, and the support portion 23 makes the inner bag 24 and the outer bag 25 liquid-tight using heat welding means. Thermoplastic resin materials such as polyethylene (PE), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyacetal (POM), thermoplastic polyester elastomer, polyphenylene sulfide (PPS), fluororesin, nylon , ABS resin or the like is used. In addition, the support part 23 can also be formed using the transparent or translucent resin material illustrated with the tank accommodating cylinder 20.

  Moreover, the support part 23 is formed in the short stepped disk shape. Specifically, the rear side that is closer to the paint storage chamber 26 described later is the small-diameter portion 23A, and the front side that is away from the paint storage chamber 26 is the large-diameter portion 23B. Further, a diameter-enlarged portion 23C for clamping is further formed at the front side position of the large-diameter portion 23B. As a result, the support portion 23 causes the large-diameter portion 23B to face the bottom surface 16A of the tank mounting portion 16, and in this state, the sandwiching enlarged-diameter portion 23C is engaged with the entire circumferential step portion 20C of the tank housing cylinder 20. By this, it can be fixed to the base member 12 together with the tank housing cylinder 20.

  Further, the rear end surface of the small diameter portion 23A is a gentle conical surface, and the paint circulation hole 23D is provided in the deepest portion so as to penetrate in the axial direction, and the paint circulation hole 23D communicates with the paint passage 15. Further, the support portion 23 is formed with an annular concave groove 23E at the step portion between the small diameter portion 23A and the large diameter portion 23B, and the concave groove 23E is a gap space 27 between the inner bag 24 and the outer bag 25. Communicating with Further, the concave groove 23E communicates with the leaked liquid discharge path 19 of the main body 13 through the communication path 23F.

  Thereby, even if the inner bag 24 or the outer bag 25 may be torn, the paint or the extruded liquid can be leaked to the outside through the concave groove 23E, the communication path 23F, and the leaked liquid discharge path 19, and the breakage is notified at an early stage. can do. Furthermore, a communication hole 23G that connects the cartridge-side extruded liquid passage 18 and the extruded liquid storage chamber 28 is formed in the pinching enlarged diameter portion 23C.

  Reference numeral 24 denotes an inner bag positioned in the tank housing cylinder 20 and fixed to the support portion 23. Reference numeral 25 denotes an outer bag that is formed slightly larger than the inner bag 24 and is fixed to the support portion 23 so as to cover the inner bag 24. The inner bag 24 and the outer bag 25 are configured as a bottomed bag body having a double structure and closed at the rear side.

  Further, the inner bag 24 and the outer bag 25 are thermoplastic resin materials that are resistant to chemicals not affected by paint and extrusion liquid, flexible enough not to be damaged by repeated bending, and capable of heat welding, for example, The film is formed of polyethylene (PE), nylon, preferably low density polyethylene (LDPE), linear low density polyethylene (LLDPE) or the like. In this case, a transparent resin material is used for the inner bag 24 and the outer bag 25 so that the inside can be visually observed.

  The front end of the inner bag 24 is an opening 24A, and is integrally welded to the outer peripheral surface of the small diameter portion 23A of the support portion 23 using a heat welding means described later. As a result, the inner bag 24 defines a later-described paint storage chamber 26 for storing the paint in cooperation with the support portion 23 in the inner space.

  On the other hand, the front end of the outer bag 25 is an opening 25A, and is integrally welded to the outer peripheral surface of the large-diameter portion 23B of the support portion 23 using heat welding means. Accordingly, the outer bag 25 defines a gap space 27 described later between the outer bag 25 and the inner tank 24 serving as an inside, and defines a later-described extruded liquid storage chamber 28 between the outer bag 25 and the tank storage cylinder 20 serving as the outside. is doing.

  In the drawing, the inner bag 24 and the outer bag 25 are shown separated from each other in order to clearly show the gap space 27. However, the inner bag 24 and the outer bag 25 are usually in close contact with each other between the inner coating and the outer extruding liquid, and the leaked paint or only when the inner bag 24 or the outer bag 25 is damaged. It functions as a passage through which the extruded liquid flows.

  Reference numeral 26 denotes a paint storage chamber defined in the inner bag 24. The paint storage chamber 26 stores paint supplied toward the rotary atomizing head 5 and communicates with the paint passage 15. Here, the volume of the paint storage chamber 26 (the internal volume of the inner bag 24) is defined by the tank storage cylinder defined by, for example, the tank storage cylinder 20 attached to the main body 13 of the base member 12. It is set to a value larger than the volume in 20, that is, the volume of the extruded liquid storage chamber 28 described later.

  As a result, even if a situation occurs in which a large amount of paint is filled in the paint storage chamber 26 by mistake, before the load is applied to the inner bag 24, the inner bag 24 is removed from the main body 13 and the tank housing cylinder 20. The inner bag 24 can be prevented from being damaged in advance.

  A gap space 27 is defined between the inner bag 24 and the outer bag 25. The gap space 27 allows the leaked paint or extruded liquid to flow when the inner bag 24 or the outer bag 25 is damaged. It constitutes a passage. Further, the gap space 27 communicates with the communication path 23 </ b> F via the concave groove 23 </ b> E of the support portion 23. As a result, when the inner bag 24 is damaged, the gap space 27 allows the inflowing paint to be discharged from the leaked liquid discharge path 19 of the base member 12 through the concave groove 23E and the communication path 23F of the support portion 23. Thus, the breakage of the inner bag 24 can be notified. Similarly, when the outer bag 25 is damaged, it is possible to report the damage of the outer bag 25 by discharging the leaked extruded liquid to the outside.

  Reference numeral 28 denotes an extruded liquid storage chamber. The extruded liquid storage chamber 28 is defined between the tank storage cylinder 20 and the outer bag 25 when the bag-like tank 22 and the tank storage cylinder 20 are attached to the base member 12. It is what is done. Here, the extruded liquid storage chamber 28 communicates with the cartridge side extruded liquid passage 18 of the base member 12 via the communication hole 23G of the support portion 23. The extrusion liquid storage chamber 28 pushes and extrudes the paint filled in the paint storage chamber 26 via the outer bag 25 and the inner bag 24 that form a bag body when the extrusion liquid flows in, or the paint storage chamber. When the paint is filled in 26, the extrusion liquid is discharged.

  Next, the structure regarding the heat welding means for fixing the inner bag 24 and the outer bag 25 to the support part 23 liquid-tightly is demonstrated, referring FIG. 5 thru | or FIG.

  In FIG. 5, reference numeral 29 denotes a small-diameter welded portion provided on the side close to the coating material containing chamber 26 in the support portion 23, that is, on the outer peripheral surface of the small-diameter portion 23A. As shown in FIG. 6, the small-diameter welded portion 29 is a liquid-tight fixing of the opening 24A side of the inner bag 24 to the outer peripheral surface of the small-diameter portion 23A of the support portion 23. A central portion is formed on the entire circumference with a predetermined width dimension. Further, the small-diameter welding portion 29 is provided for welding using a thermal welding means, and has the same diameter as the other portions in the state before the thermal welding shown in FIG. It is formed in a concavo-convex shape (comb teeth) over the entire circumference so that it can be melted evenly to the position.

  And, as shown in FIG. 8, the small-diameter welded portion 29 has an opening 24 </ b> A of the inner bag 24 around it, and a pressing tool 33, described later, heated in this state is pressed through the inner bag 24, As shown in FIG. 6, it can be melted and welded integrally with the inner bag 24. In this case, after the inner bag 24 is welded using the pressing tool 33, the small-diameter welding portion 29 is melted to have a small diameter corresponding to the pressing mark.

  Reference numerals 30A and 30B denote melt reservoirs for the two small diameter welded portions 29 provided on the outer peripheral surface of the small diameter portion 23A of the support portion 23. The two melt pools 30A and 30B are provided on both sides in the length direction with the small-diameter weld portion 29 interposed therebetween. That is, the melt pool 30A is provided so as to be adjacent to the side close to the coating material storage chamber 26 of the small diameter welded portion 29. On the other hand, the melt pool 30 </ b> B is provided adjacent to the side of the small-diameter welded portion 29 away from the paint storage chamber 26. Further, each melt pool 30A, 30B is formed in a trapezoidal cross section in which a circumferential groove formed over the entire circumference is formed on the outer circumferential surface of the small diameter portion 23A and the opening width becomes wider toward the outer diameter side. . As a result, the trapezoidal melt pools 30A and 30B can positively flow in and store excess melt 34 protruding from the welded portion between the small-diameter welded portion 29 and the inner bag 24. .

  Here, the melt reservoir 30 </ b> A on the side close to the paint storage chamber 26 can solidify the melt 34 that is almost impossible to be taken out when entering the paint storage chamber 26 in a state where the melt 34 is stored. . Thereby, the situation where the molten material 34 damages the inner bag 24 can be prevented beforehand.

  On the other hand, the melt reservoir 30B on the side away from the coating material storage chamber 26 is formed as a trapezoidal circumferential groove in substantially the same manner as the melt reservoir 30A described above. Further, the melt reservoir 30B can prevent the melt 34 from damaging the inner bag 24 and the outer bag 25 by accumulating the melt 34.

  Reference numeral 31 denotes a large-diameter weld portion provided on the side of the support portion 23 away from the coating material containing chamber 26, that is, on the outer peripheral surface of the large-diameter portion 23B. As shown in FIG. 7, the large-diameter weld portion 31 is formed on the entire circumference with a predetermined width dimension at substantially the central portion in the axial direction of the large-diameter portion 23B in the same manner as the small-diameter weld portion 29 described above. In a state prior to this, it is formed in a continuous uneven shape (comb shape).

  And the large diameter welding part 31 arrange | positions the opening 25A of the outer bag 25 in the circumference | surroundings, and the pressing tool (for large diameter welding part 31 not shown) heated in this state is pressed through the outer bag 25. Thus, it can be melted and welded to the outer bag 25 in a liquid-tight manner. In this case, after welding the outer bag 25 using a pressing tool, the large-diameter welded portion 31 melts and has a small diameter corresponding to the press mark.

  Reference numeral 32 denotes a melt reservoir for one large-diameter welded portion 31 provided on the outer peripheral surface of the large-diameter portion 23B of the support portion 23. The melt pool 32 is provided so as to be adjacent to the side closer to the coating material storage chamber 26 (the gap space 27 side) of both sides in the length direction of the large-diameter welded portion 31. Further, the melt pool 32 is substantially the same as the melt pools 30A and 30B described above, and has a circumferential groove formed over the entire circumference on the outer circumferential surface of the large-diameter portion 23B, and has an opening width toward the outer diameter side. Is formed in a trapezoidal cross section.

  Here, the melt pool 32 provided on the side of the large-diameter welded portion 31 close to the coating material containing chamber 26 removes the melt 35 that is almost impossible to be taken out when entering the gap space 27 that is the internal space of the outer bag 25. The outer bag 25 can be prevented from being melted by the melt 35.

  A melt reservoir is not provided on the side of the large-diameter welded portion 31 away from the coating material containing chamber 26. The reason is that the melt 35 'that has erected is produced after the bag-like tank 22 is manufactured. However, it can be removed, and even if the melt 35 ′ is left as it is, the bag body 24, 25 is not damaged and there is no possibility of damaging the bags 24, 25. Therefore, in order to improve the appearance, a configuration may be adopted in which a melt pool is provided on the side of the large-diameter welded portion 31 away from the paint storage chamber 26.

  Reference numeral 33 denotes a plurality of pressing tools (only two are shown in FIG. 8) used when the inner bag 24 is thermally welded to the small-diameter welding section 29. Each pressing tool 33 surrounds the support section 23. It is divided into a plurality of parts in the circumferential direction, and a circular shape that is the same as or slightly smaller than the small diameter portion 23A is formed by the inner portions of all the pressing tools 33. Each pressing tool 33 can be heated to a temperature at which the resin material can be melted.

  The coating cartridge 11 according to the present embodiment has the above-described configuration. Next, an assembling operation of the bag-like tank 22 which is a characteristic part of the present invention will be described.

  First, as shown in FIGS. 8 and 9, the opening 24A side of the inner bag 24 is placed on the outer periphery of the small-diameter portion 23A of the support portion 23 constituting the bag-like tank 22, and heated in this state as shown in FIG. Each pressing tool 33 is pressed from the outer periphery to the small-diameter weld portion 29 of the small-diameter portion 23A and the opening 24A side of the inner bag 24 at a predetermined pressure for a predetermined time. At this time, the support part 23, the inner bag 24, and each pressing tool 33 are shifted in the rotational direction and the same operation is repeated. As a result, the small-diameter welded portion 29 provided in the small-diameter portion 23A can be uniformly melted around the entire circumference, and the melted small-diameter welded portion 29 opens the outer peripheral surface of the small-diameter portion 23A of the support portion 23 and the opening of the inner bag 24. The 24A side can be liquid-tightly welded.

  Here, as described above, when the inner bag 24 is thermally welded by the small-diameter welded portion 29, among the melts generated by the melting of the small-diameter welded portion 29, it does not contribute to the welding between the support portion 23 and the inner bag 24. The excess melt 34 oozes out from between the welding surfaces of the support portion 23 and the inner bag 24 and solidifies. At this time, as shown in FIG. 6, the melt pools 30 </ b> A and 30 </ b> B provided adjacent to the small-diameter welded portion 29 can be accommodated so as to block the excess melt 34. Similarly, when the outer bag 25 is thermally welded by the large-diameter welded portion 31, the melt reservoir 32 provided adjacent to the large-diameter welded portion 31, as shown in FIG. Can be accommodated.

  Thus, according to the present embodiment, the support portion 23 of the bag-like tank 22 is formed of a meltable resin material, and the opening 24A side of the inner bag 24 is heated on the outer peripheral surface of the small diameter portion 23A of the support portion 23. An annular small-diameter welded portion 29 for welding using a welding means is provided, and an annular large-diameter for welding the opening 25A side of the outer bag 25 using a thermal welding means on the outer peripheral surface of the large-diameter portion 23B. In addition to providing the welded portion 31, the outer peripheral surface of the small-diameter portion 23 </ b> A and the outer peripheral surface of the large-diameter portion 23 </ b> B are connected to the small-diameter weld portion 29, the melt reservoirs 30 </ b> A and 30 </ b> B, and the melt reservoir 32. It is set as the structure which provides.

  Here, the melt pools 30A and 30B store the extra melt 34 that does not contribute when the inner bag 24 is welded to the small-diameter welded portion 29 so as to dam and store the melt 34 inside. be able to. Further, the melt pool 32 can store the melt 35 eluted when the outer bag 25 is welded to the large-diameter weld portion 31 so as to dam and solidify the melt.

  As a result, the melt pools 30A and 30B can store the melt 34, and the melt pool 32 can store the melt 35. Therefore, the inner bag 24 and the outer bag 25 of the bag-like tank 22 are damaged by the melt. Can be prevented, and the lifetime of the inner bag 24, the outer bag 25, etc. can be extended and the reliability can be improved.

  In addition, melt pools 30 </ b> A and 30 </ b> B are provided on both sides of the small diameter welded portion 29 in the length direction on the outer peripheral surface of the small diameter portion 23 </ b> A of the support portion 23. In particular, the melt reservoir 30A provided adjacent to the side close to the paint storage chamber 26 of the small-diameter weld 29 captures the melt 34 that elutes to the paint storage chamber 26 side, which is a large element that damages the inner bag 24. Can be stored. In addition, since the melt pool 32 is provided on the outer peripheral surface of the large-diameter portion 23B of the support portion 23 on the side close to the gap space 27 that is the internal space of the large-diameter weld portion 31, the melt space 32 protrudes into the gap space 27. It is possible to prevent the melt 35 from entering. Thereby, it can prevent reliably that a molten material penetrate | invades inside the inner bag 24 and the outer bag 25 which cannot be taken out if it invades.

  On the other hand, since the melt pools 30A, 30B, 32 are formed as a circumferential groove on the outer peripheral surface of the support portion 23, most of the excess melt 34, 35 generated at the time of heat welding corresponds to the corresponding melt. It can be stored in the pools 30A, 30B, 32.

  Furthermore, the inner bag 24 and the outer bag 25 form a double-structured bag body, and a gap space 27 defined between the inner bag 24 and the outer bag 25 is formed outside (atmosphere) via the leaked liquid discharge passage 19 and the like. ). Accordingly, when the inner bag 24 is damaged and the paint in the paint storage chamber 26 leaks from the damaged portion of the inner bag 24 into the gap space 27, the leaked liquid discharge path 19 discharges the paint to the outside. The breakage of the bag 24 can be notified. Similarly, when the outer bag 25 is broken, the breakage of the outer bag 25 can be notified by discharging the extruded liquid leaking into the gap space 27 to the outside. Thereby, the slight breakage of the inner bag 24 and the outer bag 25 can be detected at an early stage, and damage due to the damage of the inner bag 24 and the outer bag 25 can be minimized.

  In the embodiment, the small-diameter weld portion 29 provided in the small-diameter portion 23A of the support portion 23 is an example in which the tip side is formed in a continuous uneven shape (comb-tooth shape) in a state before heat welding. And explained. However, the present invention is not limited to this. For example, as in the first modification shown in FIG. 11, a small-diameter weld portion 41 having a flat front end may be provided on the small-diameter portion 23A of the support portion 23. This configuration can be similarly applied to a large-diameter weld.

  Further, in the embodiment, the melt pools 30A and 30B provided in the small diameter portion 23A of the support portion 23 are cross-sectional bases whose opening width becomes wider toward the outer diameter side in order to positively flow in excess melt. The case where it is formed in a shape has been described as an example. However, the present invention is not limited to this. For example, a melt reservoir 51A, 51B according to the second modification shown in FIG. . In this configuration, the melt 34 that has flowed into the melt reservoirs 51A and 51B and solidified can be stored in the melt reservoirs 51A and 51B. This configuration can be similarly applied to a large-diameter weld.

  Furthermore, in the embodiment, the case where the inner bag 24 and the outer bag 25 have a double structure has been described as an example. However, the present invention is not limited to this, and may be constituted by a single bag, for example.

It is a longitudinal cross-sectional view shown in the state which attached the cartridge for coating by embodiment of this invention to the coating device. It is a longitudinal cross-sectional view which expands and shows the coating cartridge by embodiment of this invention single-piece | unit. FIG. 3 is an exploded sectional view of the coating cartridge shown in FIG. 2. It is a longitudinal cross-sectional view which expands and shows a bag-like tank by itself. It is a longitudinal cross-sectional view which expands and shows the A section in FIG. It is a longitudinal cross-sectional view which expands and shows the B section in FIG. It is a longitudinal cross-sectional view which expands and shows the C section in FIG. It is operation | movement explanatory drawing which shows the state which heat-welds an inner bag to a support part using a pressing tool. It is operation | movement explanatory drawing which expands and shows the state which heat-welds an inner bag to the small diameter welding part of a support part using a pressing tool. It is operation | movement explanatory drawing which expands and shows the state which heat-welded the inner bag to the outer peripheral surface of the support part using the pressing tool. It is a principal part expansion longitudinal cross-sectional view of the support part which shows the small diameter welding part by the 1st modification of this invention. It is a principal part expansion longitudinal cross-sectional view of the support part which shows the melt pool by the 2nd modification of this invention.

Explanation of symbols

1 Rotating atomizing head type coating equipment (spraying means)
DESCRIPTION OF SYMBOLS 11 Coating cartridge 12 Base member 13 Main body part 14 Feed tube 15 Paint passage 16 Tank attachment part 19 Leakage liquid discharge path 20 Tank accommodating cylinder 22 Bag-shaped tank 23 Support part 23A Small diameter part 23B Large diameter part 24 Inner bag (bag body) )
24A, 25A Opening 25 Outer bag (bag)
26 Paint storage room (internal space)
27 Crevice space 28 Extruded liquid storage chamber 29 Small diameter welded portion 30A, 30B, 32 Melt pool 31 Large diameter welded portion 34, 35, 35 'Melt

Claims (4)

A base member with one side serving as a feed tube having a paint passage across the main body portion attached to the spray means and the other side serving as a tank mounting portion,
A tank housing cylinder comprising a bottomed cylinder having an open front end, the opening side of which is detachably attached to the tank mounting portion of the base member;
The base member includes a support portion supported between the tank mounting portion of the base member and the tank housing cylinder, and a bottomed bag body formed of a flexible material and having a front end opened. The front end of the bag body is In a coating cartridge comprising a bag-like tank fixed to a support portion and defining a space in the bag body,
The support part of the bag-shaped tank is formed of a meltable resin material,
The support portion of the bag-shaped tank is provided with an annular weld portion for welding the front end side of the bag body using a heat welding means located on the outer peripheral surface thereof,
A position of the outer peripheral surface of the support portion adjacent to the welded portion is provided with a melt reservoir that accumulates an excess melt that protrudes when the front end side of the bag body is welded to the welded portion. A coating cartridge characterized by that.   2. The coating according to claim 1, wherein the melt pool is configured to be provided at least on the side close to the inner space of the bag body, on both sides in the length direction of the welded portion provided on the support portion of the bag-shaped tank. cartridge.   The coating cartridge according to claim 1, wherein the melt pool is an all-around groove formed on an outer peripheral surface of the support portion over the entire circumference. The outer peripheral surface of the support portion of the bag-shaped tank has a small-diameter weld on the side close to the internal space of the bag body, and is formed in a stepped shape having a large-diameter weld on the side away from the internal space,
The bag body of the bag-shaped tank has a double structure with an inner bag welded using the small diameter welded portion and an outer bag welded using the large diameter welded portion so as to cover the inner bag,
The coating cartridge according to claim 1, 2 or 3, wherein the melt pool is provided at a position adjacent to the small diameter welded portion and a position adjacent to the large diameter welded portion.

Images