JP5412668B2 - Spray device with adjusting member - Google Patents

Description

  The present invention relates to a spray device for spraying paint onto an object to be painted (hereinafter referred to as “object to be coated”). In particular, the present invention relates to a spray device in which a needle is movable along an axial direction. Furthermore, the present invention can spray not only paint but also various liquids such as water, adhesives, rust preventives, insulating agents, coating agents, chemicals, etc. on an object to be sprayed. ) Of a spray device provided with an adjustment member (adjustment knob).

  One or a plurality of plate-type automatic guns, which are spray devices for spraying paint on an object to be coated, are installed on a painting line as automatic spray guns for painting. There are many types of painting lines, such as a suspension type and a floor type, and the conveyor speed may be constant or tact type. In addition, in some cases, the object to be flowed alone, in some cases the object to be rotated, in some cases, a plurality of objects to be hung on one hanger, or in the case of a tact type In some cases, a plurality of objects to be coated are arranged and rotated on the circumference.

  Regarding the installation method of the automatic spray gun, it may be fixed, or the robot may be equipped with an automatic spray gun, or it will move up and down or back and forth (from front to back) on the same straight line. One or a plurality of automatic spray guns may be attached to an apparatus called “reciprocator”, or the above-described configuration may be combined.

  In actual users, several types of objects to be coated are usually handled. In many cases, the same objects to be coated are divided into various types of colors. It is also known that the shape and size of the object to be coated are various.

  Some paints are called primer or base coat, others are solid colors called solid, metallic (usually aluminum powder), pearl (pearl), mica (mica), beads (glass), clear (transparent), Various types such as color clear (colored transparent) are used. With respect to the solvent type, there are a solvent type, a high solid type (having a small proportion of the solvent), and an aqueous type. Various types of resin components such as melamine, fluorine, acrylic and urethane are used. The painting process includes undercoating, intermediate coating, and topcoating, and the processes and man-hours vary.

  For example, in the conventional first type, in the spray gun, a remote control type displacement mechanism for displacing the stopper between two preset positions is provided, and the opening of the discharge port is remotely controlled in two stages of full open and half open. It is comprised so that it can do (refer patent document 1).

  In the conventional second type, in the coating device, the first rear end abutting position of the needle valve is instantaneously lowered to the second rear end abutting position of the needle valve by releasing the driving force of the cylinder and discharging. It is configured such that the initially set application amount is recovered by discharging the accumulated matter in the flow path, then driving the cylinder and instantaneously returning it to the first rear end abutting position of the needle valve. . The position of the end when the cylinder piston advances is adjusted by a piston advance end adjusting screw (see Patent Document 2).

  In the third conventional type, the spray device includes a gun unit for atomizing the paint and ejecting it, and a bracket unit for receiving the paint and air. The bracket unit is configured to be detachably fixed to the gun unit. The nozzle opening / closing valve is moved backward to eject the paint from the paint ejection hole (see Patent Document 3).

  In the conventional fourth type, in the spray gun, the rear end of the needle valve is fixed to the first piston disposed rearward with a screw, and the second piston is disposed in front of the first piston. The compressed air is supplied to the first air supply passage for moving the first piston, or the compressed air is supplied to the second air supply passage for moving the second piston to change the moving amount of the needle valve. In this case, the discharge is performed with different discharge amounts (see Patent Document 4).

  In the conventional fifth type, in the spray gun, a first adjustment member that can be adjusted back and forth with a screw is provided on the end lid of the cylinder. The tip of the first adjustment member is made to correspond to the spring receiving member. The spring receiving member is provided with a second adjusting member that can be adjusted from the outside by a screw (see Patent Document 5).

  In the conventional sixth type, in the spray gun, a first adjusting member that can be adjusted back and forth with a screw is provided on the end lid of the cylinder. The tip of the first adjustment member is made to correspond to the spring receiving member. The spring receiving member is provided with a second adjusting member that can be adjusted from the outside with a screw and is screwed (see Patent Document 6).

  In the conventional seventh type, the open / close valve with a flow rate control function includes a long spring and a short spring as return springs. By changing the pilot air pressure, the needle valve body is opened stepwise to adjust the flow rate (see Patent Document 7).

  In the conventional eighth type, in the paint supply needle valve, the needle valve body is switched between a small flow path valve open position and a large flow path valve open position (see Patent Document 8).

  In the conventional ninth type, in the spray gun needle valve, the air is pumped into the second cylinder chamber, whereby the second piston is displaced to the locking position provided in the first piston, and the paint discharge port is opened halfway. The first piston is displaced with the second piston by pumping air into the first cylinder chamber, and the paint discharge port is fully opened (see Patent Document 9).

JP 59-62360 A JP 2003-205258 A JP 2008-649 A JP 2008-12404 A Japanese Utility Model Publication No. 63-38929 Japanese Utility Model Publication No. 60-13264 Japanese Utility Model Publication No. 5-71547 Publication 3-36779 Japanese Utility Model Publication No. 48-14667

  From the above viewpoint, in the spray device, it is expected that the color change and the cleaning are frequently performed, and it is desirable that the color change and the cleaning are performed automatically and surely quickly. In the conventional spray coating apparatus, it is necessary to remove the nozzle from the spray gun body when overhauling the spray gun. Furthermore, in the conventional spray coating apparatus, the structure of the piston member and the body member is complicated, and much time is required for manufacturing and assembly.

  Referring to FIG. 19, a conventional adjustment type spray coating apparatus 900 includes a gun body 910 and a rear body 930. A fluid tip 912, a needle 914, and a front piston 916 are disposed on the gun body 910. The front piston 916 is biased forward by a spring 918. A front piston packing 920 hermetically seals the front piston 916 and the gun body 910.

  The opening degree (clearance) of the fluid tip 912 and the needle 914 can be adjusted by the adjustment knob 932 and the lock nut 934 arranged at the rear part. In this spray coating apparatus 900, for example, the opening degree of the needle 914 at the time of painting is set at a position where the adjustment knob 932, which is an adjustment member, is rotated 1.5 times from the fully closed position, or the adjustment knob 932 is 2.0 from the fully closed position. The paint was set at the rotated position. If you want to change the color of the object to be coated (the object to be painted) in the painting line, perform a washing process and apply a paint with a color different from the color of the paint that has been applied until then. ). In such a case, if the opening (clearance) of the fluid tip 912 and the needle 914 is narrow, it takes time for cleaning (using thinner), resulting in production loss. Therefore, the adjustment knob is temporarily fully opened during cleaning. In many cases, the opening degree was adjusted to the position, that is, the position rotated from 4.0 to 5.0.

  As a problem in this case, it is necessary to return the opening degree (clearance) of the fluid tip 912 and the needle 914 to the original state after completion of the cleaning process. However, the conventional adjustment knob 932 is a screw type and is adjusted. Since the knob 932 is fixed by the lock nut 934, it is difficult to accurately adjust the adjustment knob 932 to the original position, and a lot of time is required for the adjustment. If an adjustment failure of the adjustment knob 932 occurs, the amount of paint sprayed from the spray application device 900 may fluctuate and a defective coating may occur.

An object of the present invention is to efficiently perform a painting operation when cleaning a nozzle of a spray device, to shorten the time required for changing the coating material, and to cope with the multicoloring of the painting operation. It is in providing the spray apparatus comprised.
Another object of the present invention is to provide a spray device that can easily adjust the amount of paint sprayed in a short time.
Another object of the present invention is to provide a spray device that is easy to manufacture and assemble in the spray device.
Another object of the present invention is to provide a spray device configured to easily realize any of a conventional adjustment type, an air type two-stage drawing type, and a manual type multi-stage type. Is to provide.

  The present invention relates to a spray device for spraying paint from a paint jet hole, a nozzle having a paint jet hole for atomizing and jetting the paint, a needle for opening and closing the paint jet hole, and a fixed to the needle A front piston, a needle spring provided to push the front piston toward the paint ejection hole, a gun body containing the nozzle and containing the front piston, and a rear of the gun body A rear body, a needle position adjusting mechanism for adjusting the position of the needle in a direction along the central axis of the nozzle, and a bracket unit detachably fixed to the gun body. .

  When the bracket unit is fixed to the gun body, the paint and air received by the bracket unit are configured to circulate in the gun body. The needle position adjusting mechanism is configured to set the position of the front piston along the center axis of the nozzle corresponding to the rotation angle of the adjustment member and the adjustment member that can rotate about the center axis of the nozzle. A rotational position setting member.

  The front piston moves along the central axis of the nozzle in a direction away from the paint spray hole together with the needle in a state where the needle position adjusting mechanism is adjusted and the discharge amount of the paint coming out from the paint spray hole is set. Then, the front piston and the needle are configured to move together in a direction away from the paint spray hole. The spray device having this configuration is easy to disassemble, assemble, maintain, and replace parts on the gun body side. In the spray device of the present invention, the amount of paint discharged can be easily adjusted, and the nozzle can be cleaned efficiently.

  In the spray device of the present invention, the needle position adjusting mechanism includes an adjustment knob that is rotatable about the center axis of the nozzle, and the front along the center axis of the nozzle corresponding to the rotation angle of the adjustment member. And a rotation stopper for setting the position of the piston. An outer peripheral portion of the cylindrical portion of the front piston is slidably disposed in an inner peripheral portion of the cylindrical portion of the rotation stopper.

  In the spray device of the present invention, the rotation stopper is formed with a plurality of counterbores, the rear body is provided with a rotation stopper positioning pin, and the adjustment knob is moved in a direction along the central axis of the nozzle. The rotation stopper positioning pin can be positioned in the countersunk hole by rotating the adjustment knob.

  The spray device of the present invention can be used in a fixed manner, or can be used with a robot having an automatic spray gun, or one or a plurality of automatic spray guns can be attached to a device called “reciprocating”. They can be attached and used, or they can be used in combination with the above-described configurations.

  When performing the painting operation in the spray device of the present invention, the needle position adjusting mechanism is used to rotate the adjustment member around the center axis of the nozzle so that the position of the front piston along the center axis of the nozzle is the coating operation position. Set to. Next, the front piston operating air is sent from the supply source of the front piston operating air to the gun unit, the needle is moved backward, and the paint is ejected from the paint ejection hole. At this time, by introducing the atomizing air from the atomizing air supply source and ejecting the atomizing air from the atomizing air hole, the paint ejected from the paint ejection hole can be atomized. At the same time, the pattern air is introduced from the pattern air supply source, and the pattern air is ejected from the pattern air holes, whereby an atomized paint pattern can be formed. The remaining paint not ejected from the paint ejection hole can be returned to the paint supply source (or paint tank). In this way, a paint circulation line can be constructed.

  If the paint contains metal powder, such as metallic paint, if the paint circuit is closed for a long time, the heavy contents tend to sink (settling), resulting in poor painting or clogging of the paint circuit. May occur. Therefore, in such a case, a circulation type configuration is preferable. Alternatively, it may be configured as a non-circulation type having no return passage. Alternatively, by using the spray device of the present invention, not only paints but also various liquids such as water, adhesives, rust preventives, insulating agents, coating agents and chemicals can be sprayed automatically or manually. .

  In the spray device of the present invention, when cleaning the nozzle of the spray gun body, the front member along the central axis of the nozzle is rotated by rotating the adjustment member about the central axis of the nozzle using a needle position adjusting mechanism. Set the piston position to the cleaning position. In the state where the front piston operating air is introduced from the front piston operating air supply source into the front piston operating chamber, the needle and the front piston come together and move backward along the nozzle center axis against the spring force of the needle spring. Keep moving. In this state, the nozzle can be cleaned.

  In the spray device of the present invention, the amount by which the needle can move backward from the state in which the nozzle is closed to the state in which the nozzle is cleaned can be set sufficiently large. Therefore, it is possible to efficiently perform the painting work when cleaning the nozzle of the spray device, and to reduce the downtime of the painting work. Moreover, the spray apparatus of this invention can shorten the time which change of a coating material requires, and can respond to the multicoloring of a painting operation. In addition, since the spray device of the present invention has a detachable unit structure, it is easy to manufacture and assemble parts constituting each unit.

  In addition, since the spray device of the present invention is configured as described above, compared to the conventional spray device, it is possible to improve performance such as greatly reducing the cleaning time and greatly improving the operation efficiency. . In the conventional spray device, the needle adjustment is adjusted by using the needle adjustment knob at the rear of the spray gun, so that it is necessary to open the manual knob in order to fully open the needle. For this reason, in many cases when returning the needle position to the original position, it has been necessary to readjust manually by relying on the operator's sense and visual observation.

  Furthermore, in the spray device of the present invention, any of the three types of types of spray devices of the conventional adjustment type, pneumatic two-stage drawing, and manual multiple-stage type can be easily realized. By introducing these three types of spray devices, the line configuration for each customer (user) of the spray device, the equipment status, the color change of the object to be coated (product), the type of paint used, etc. The type of spray device can be selected, and a plurality of types of spray devices can be used in combination. In other words, the synergistic effect of using three types of spray devices can improve the value of the article (product) to be coated, and can be differentiated from general products, making it easier to sell products. I can expect it.

  In addition, the manual multi-stage spray device of the present invention has one less air circuit than the air-type two-stage spray device (similar to the conventional adjustment-type spray device). When the conventional adjustment type spray device is in use, the manual multi-stage type spray device of the present invention can be replaced without adding an air circuit.

In embodiment of this invention, it is a longitudinal cross-sectional view which shows the structure of the spray apparatus of the state which closed the nozzle. In embodiment of this invention, it is a front view which shows the structure of a gun unit. In embodiment of this invention, it is a side view which shows the structure of a spray apparatus. In embodiment of this invention, it is a rear view which shows the structure of a gun unit. In embodiment of this invention, it is a rear view which shows the structure of a gun unit and a bracket unit. In embodiment of this invention, it is a longitudinal cross-sectional view which shows the structure containing the flow path of the spray apparatus. In embodiment of this invention, it is a schematic sectional drawing which shows arrangement | positioning of the flow path of a spray apparatus. In the embodiment of the present invention, it is an exploded view showing the structure of the rear body, the rotation stopper, and the adjustment knob. In the embodiment of the present invention, it is a figure showing the structure of a rear body, a rotation stopper, and an adjustment knob. 9A is a front view, FIG. 9B is a cross-sectional view, FIG. 9C is a side view, and FIG. 9D is a rear view. In embodiment of this invention, it is a perspective view which shows the structure of a rotation stopper. In embodiment of this invention, it is a figure which shows the structure of a rotation stopper. 11A is a front view, FIG. 11B is a cross-sectional view, FIG. 11C is a side view, and FIG. 11D is a rear view. In embodiment of this invention, it is a figure which shows the structure of an adjustment knob. 12 (a) is a front view of the adjustment knob, FIG. 12 (b) is a sectional view of the adjustment knob, FIG. 12 (c) is a side view of the adjustment knob, and FIG. 12 (d) is an adjustment knob. FIG. In embodiment of this invention, it is a longitudinal cross-sectional view which shows the structure of the spray apparatus in the state of the 1st discharge amount of a nozzle. In embodiment of this invention, it is a longitudinal cross-sectional view which shows the structure of the spray apparatus in the state of the 2nd discharge amount of a nozzle. In embodiment of this invention, it is a longitudinal cross-sectional view which shows the structure of the spray apparatus in the state (state which wash | cleans a nozzle) of the 3rd discharge amount of a nozzle. It is a longitudinal cross-sectional view which shows the structure of the spray apparatus of the state which closed the nozzle, when comprising the air-type two-stage drawing apparatus using the gun unit of this invention. FIG. 5 is a longitudinal sectional view showing the structure of the spray device when the nozzle is in a first open state when an air-type two-stage spray device is configured using the gun unit of the present invention. FIG. 5 is a longitudinal sectional view showing the structure of the spray device in a second open state of the nozzle (a state in which the nozzle is washed) when a pneumatic two-stage spray device is configured using the gun unit of the present invention. It is a longitudinal cross-sectional view which shows the structure of the spray apparatus of the state which closed the nozzle in the conventional adjustment type spray apparatus.

(1) Configuration of spray device:
Embodiments of the present invention will be described below with reference to the drawings. The embodiment of the present invention described below relates to a spray device that sprays paint on an object. However, the spray device according to the present invention is not limited to paint, but includes water, a liquid type adhesive, and a liquid type. Note that it can be widely applied to various liquids such as rust preventives, liquid type insulating agents, liquid type coating agents, and liquid type chemicals.

  The spray device of the present invention can be referred to as a “manual two-stage pulling-type” spray device, and the description “two-stage pulling” here refers to an arbitrary position (needle pulling distance), It means two of the CLEAN positions. Therefore, the spray device of the present invention relates to a “manual multi-stage” spray device in which a needle can be set at a plurality of positions. In the embodiment of the spray device of the present invention described below, the needle is set at three positions (a position where the first discharge amount can be ejected, a position where the second discharge amount can be ejected, and a cleaning position). The spray device of the present invention can be applied to a spray device in which the needle can be set at two positions, or the needle can be moved to three or more positions ( Spray position that can be set to a position where the first discharge amount can be ejected, a position where the second discharge amount can be ejected, ..., a position where the Nth discharge amount can be ejected, and a cleaning position) It should be noted that this can also be applied.

  Referring to FIGS. 1 to 3, in the embodiment of the present invention, a spray device 400 for spraying paint onto an object to be coated from a paint spraying hole of a nozzle is a gun unit for atomizing paint and spraying it. 110, a bracket unit 210 constituting a manifold for receiving paint and air, and a rear body 420. By using a unit fixing device such as the hexagon socket head bolt 220, the bracket unit 210 is configured to be detachably fixed to the gun unit 110. For example, the bracket unit 210 is disposed with respect to one surface of the gun unit 110. The rear body 420 is disposed behind the gun unit 110.

(2) Gun unit configuration:
1 to 4, a gun unit 110 includes a gun body 112 constituting a base member, a nozzle 114 supported on the front side of the gun body 112, an air cap 120 supported on the front side of the nozzle 114, A retaining ring 128 that supports the air cap 120 with respect to the gun body 112 and a rear body 420 disposed on the rear side of the gun body 112 are provided. The gun body 112 is preferably formed of engineering plastic having strength and solvent resistance.

  The gun body 112 is made of, for example, POM (polyoxymethylene). The rear body 420 is preferably made of, for example, POM (polyoxymethylene). POM (polyoxymethylene) has solvent resistance and can be applied to water. With this configuration, the weight of the gun body 112 can be reduced. When a plurality of spray devices are mounted on a robot or reciprocator, the load weight (loading capacity) and the operation range may be limited, and the weight of the gun body 112 needs to be reduced. In addition, when it is not necessary to reduce the weight, it is possible to use conventional aluminum (alumite treatment), a stainless steel material, or a heat treatment product of a stainless steel material.

  Guide pins 112P for guiding the bracket unit 210 are provided on the lower surface side of the gun body 112. A female thread portion 112F for screwing the hexagon socket head bolt 220 for fixing the bracket unit 210 is provided on the lower surface side of the gun body 112. Although one guide pin 112P is shown in the figure, it is preferable to provide two guide pins 112P. The number of guide pins 112P may be one or two.

  Here, “front” and “front side” indicate a direction and a side in which the gun unit 110 ejects paint. Further, “rear” and “rear side” indicate the direction and side opposite to the direction and side in which the gun unit 110 ejects paint.

  The nozzle 114 is formed in a cylindrical shape and defines a nozzle center axis 114A. The nozzle 114 includes a nozzle body 114B and a nozzle tip 114C. The tip of the nozzle tip 114C is formed in a tapered shape. The nozzle tip 114C is preferably formed of a tungsten alloy. The nozzle body 114 </ b> B is supported with respect to the gun body 112 by the first screw reinforcing ring 115 and the second screw reinforcing ring 116. A first retaining pin 117 positions the second screw reinforcement ring 116 relative to the gun body 112. The first screw reinforcement ring 115 is located forward and outward from the second screw reinforcement ring 116. The first screw reinforcement ring 115 is preferably fixed to the gun body 112 by fixing with a pin (not shown) and bonding. It is preferable to use a helicate (commercially available screw reinforced component) for the threaded portion of the gun body 112.

  Referring to FIGS. 1 and 2, a paint ejection hole 122 for ejecting paint is provided at the tip of the nozzle tip 114 </ b> C. The inside of the nozzle 114 can distribute | circulate a liquid coating material. The air cap 120 has a sub-atomization air hole 124. The tip of the nozzle 114 is disposed in the nozzle hole of the air cap 120. The central axis of the paint ejection hole 122 is disposed on the nozzle central axis 114A. The center of the nozzle hole of the air cap 120 is disposed on the nozzle center axis 114A. A pattern air hole 126 is provided for ejecting air for forming an atomized paint pattern ejected from the paint ejection hole 122. A plurality of pattern air holes 126 are preferably arranged concentrically around the nozzle center axis 114A.

  A plurality of sub-atomizing air holes 124 are preferably arranged concentrically around the nozzle center axis 114A. Alternatively, a plurality of sub-atomizing air holes 124 are arranged concentrically with the first radius around the nozzle center axis 114A, and a further radius different from the first radius (second radius or first radius). In the second radius and the third radius, a plurality of nozzles can be arranged concentrically with the nozzle center axis 114A as the center.

  Referring to FIG. 1, the gun unit 110 includes a nozzle opening / closing valve or needle 150 for opening and closing the paint spray hole 122, a needle seal kit 160 for supporting the needle 150 disposed inside the gun body 112, A front piston 170 disposed behind the needle seal kit 160 inside the gun body 112. The needle seal kit 160 is disposed behind the nozzle 114. The needle 150 includes a needle tip 150C located at the front and a needle body 150B located at the rear. The rear part of the needle tip 150C is fitted and fixed to the front part of the needle body 150B. The center axis of the needle tip 150C is arranged at the nozzle center axis 114A. The central axis of the needle body 150B is arranged at the nozzle central axis 114A. Therefore, the center axis of the needle 150 is disposed on the nozzle center axis 114A.

  The needle tip 150C is preferably formed of a tungsten alloy. The needle body 150B is preferably formed of stainless steel (for example, SUS304) and subjected to hard chrome treatment. By forming the needle tip 150C from a tungsten alloy, the durability can be greatly improved as compared with a conventional SUS303. With this configuration, it is possible to prevent spits due to wear (that is, a kind of painting trouble, which is a malfunction due to liquid leakage at the tip of the nozzle). At the same time, this configuration facilitates maintenance of the needle 150 and allows the replacement time of the needle 150 to be delayed. Further, by performing hard chrome treatment on the needle body 150B, troubles due to liquid leakage from the needle seal portion due to wear of the needle body 150B can be avoided, maintenance of the needle 150 is facilitated, and the replacement time of the needle 150 is delayed. It becomes possible.

  The third screw reinforcing ring 142 is fixed to the gun body 112 by the third screw reinforcing ring retaining pin 140. The third thread reinforcing ring 142 has a female thread portion for screwing and fixing the needle seal kit 160. The needle seal kit 160 has a male thread portion for screwing and fixing the needle seal kit 160. The needle seal kit 160 can be detachably fixed to the gun body 112 by screwing the male screw portion of the needle seal kit 160 into the female screw portion of the third screw reinforcing ring 142.

  The needle seal kit 160 includes a retaining ring 160A, a seal stopper 160B located at the rear, a first omni seal 160C, a seal housing 160D, a first O-ring (first O-ring) 160E, and a second omni seal. 160F, 2nd * O-ring (2nd O-ring) 160G, and the front seal 160H located ahead are included. The center axis of the needle seal kit 160 is disposed on the nozzle center axis 114A. The second O-ring 160G is located in front of the first O-ring 160E. The second omni seal 160F is located in front of the first omni seal 160C. The second omni seal 160F is held inside the front of the seal housing 160D by the front seal 160H. The first omni seal 160C is held inwardly behind the seal housing 160D by a seal stopper 160B. The seal stopper 160B is held inwardly behind the seal housing 160D by a retaining ring 160A. The second omni seal 160F and the first omni seal 160C are provided to seal the seal housing 160D and the needle body 150B. The first O-ring 160E and the second O-ring 160G are provided to seal the seal housing 160D and the gun body 112.

  The first O-ring 160E and the second O-ring 160G are preferably O-rings made of perfloated. Generally, rubber-related materials are weak against solvents and have a high possibility of being deformed or expanded. In applications where the product is mainly used for painting and a solvent is used during overhaul or maintenance, it is preferable to use perflo in order to avoid troubles that cannot be assembled or moved.

  The needle seal kit 160 is configured so as to be extracted and replaced in an integrated manner, so that maintenance of the gun is facilitated. The two V-packings used in the needle seal kit 160 have low sliding resistance, prevent liquid leakage due to wear with the needle body 150B, and help improve durability. The front seal 160H is a double-added front V-packing function (function to seal liquid), and the sliding resistance (sealing condition) can be adjusted by the tightening condition of the needle seal kit 160. . Therefore, even when the front seal 160H is worn, the structure is such that the function of sealing the liquid is exhibited by increasing the tightening amount. That is, the needle seal kit 160 is tightened, and the front end side of the par front seal 160H is crushed to exhibit the function of sealing the liquid.

  Two O-rings on the outside of the needle seal kit 160, that is, the first O-ring 160E and the second O-ring 160G have a function of sealing the liquid (paint) by the front second O-ring 160G. The first O-ring 160E on the rear side exhibits a function of sealing air with the gun body 112. Therefore, with this configuration, the durability of the needle seal kit 160 can be significantly improved, maintenance of the needle seal kit 160 can be facilitated, and the replacement time of the needle seal kit 160 can be delayed. Yes.

  The front piston 170 is provided so as to be movable along the nozzle center axis 114. The front piston 170 is disposed behind the needle seal kit 160. The front piston 170 includes a front piston shaft 170A, a front piston flange 170F provided in front of the front piston shaft 170A, and a front piston packing receiving portion 170G provided on the outer periphery of the front piston flange 170F. A front piston hole 170H is provided in front of the front piston shaft 170A. A rear shaft portion 150D provided at the rear of the needle body 150B is fitted into the front piston hole 170H and bonded and fixed.

  The front piston packing 170C is disposed in the groove of the front piston packing receiving portion 170G. The front piston packing 170C is provided to seal the front piston main body 170B and the gun body 112. The front piston packing 170C is preferably formed of perflo. With this configuration, sliding resistance can be reduced and wear resistance can be improved.

  The front piston main body 170B can be formed of an aluminum alloy A2021 (for example, alumite treatment may be performed). A front piston working chamber 176 is configured in the gun body 112 in front of the front piston 170.

  A needle spring 174 is arranged to push the front piston body 170B forward. The needle spring 174 can be formed of a coil spring of stainless steel (for example, SUS304). The needle spring 174 is disposed outside the rear shaft portion 170D of the front piston main body 170B. The rear portion of the needle spring 174 is disposed so as to contact a flat portion facing the front of the rotation stopper 450 (described later). The front portion of the needle spring 174 is disposed so as to contact the rear facing portion of the front piston flange 170F of the front piston body 170B. The center axis of the needle spring 174 may be disposed on the nozzle center axis 114A. Due to the elastic force of the needle spring 174, the front piston 170 receives a force in the direction of moving forward. Therefore, when pressurized air is not introduced into the front piston working chamber 176, the front piston 170 moves forward, and the needle tip 150C of the needle 150 is configured to close the paint ejection hole 122.

  Referring to FIGS. 1 and 4, the rear body 420 is screwed and fixed to the rear end portion of the gun body 112 by rear body fixing bolts 192A and 192B. As shown in the figure, for example, the rear body 420 can be fixed to the gun body 112 using two rear body fixing bolts 192A and 192B. The two rear body fixing bolts 192A, 192B are preferably arranged symmetrically with respect to the nozzle center axis 114A so as to form an angular interval of 180 degrees. The number of rear body fixing bolts may be one or two or more. When a plurality of rear body fixing bolts are used, the rear body fixing bolts are preferably arranged at equal angular intervals around the nozzle center axis 114A.

  The gun unit 110 further includes an adjustment knob 430 that constitutes an adjustment member for adjusting the position of the needle 150 in the direction of the nozzle center axis 114A, and a rotation stopper 450 for determining the position of the adjustment knob 430 in the rotation direction. With. The adjustment knob 430 is configured to be rotatable about the nozzle center axis 114A. The adjustment knob 430 is disposed behind the rear body 420.

  Referring to FIGS. 8 and 9, the rear body 420 includes a base part 422, an annular front concave part 424 formed on the front side of the base part 422, and an annular rear convex part formed on the rear side of the base part 422. Part 426. Two screw through holes 426 </ b> A and 426 </ b> B are formed in the base portion 422. The two bolt holes 420A and 420B are preferably arranged at point-symmetrical positions so as to form an angular interval of 180 degrees around the nozzle center axis 114A. A rear body center hole 420H is formed in the base portion 422 around the nozzle center axis 114A. The two screw through holes 426A and 426B are preferably arranged symmetrically with respect to the nozzle center axis 114A so as to form an angular interval of 180 degrees. The two rotation stopper positioning pins 432A and 432B are fixed perpendicularly to the front-facing surface inside the rear protrusion 426 of the rear body 420 by pin fixing screws 440A and 440B. That is, the positions at which the centers of the two rotation stopper positioning pins 432A and 432B are arranged are the same center as the centers of the respective screw through holes 426A and 426B.

  Referring to FIGS. 8 to 11, the rotation stopper 450 is disposed in the front recess 424 of the rear body 420. The rotation stopper 450 includes a disk-shaped base portion 452, an annular front shaft portion 453 formed on the front side of the base portion 452, and a columnar rear shaft portion 454 formed on the rear side of the base portion 452. Including. A front hole portion 455 is formed in the center portion of the base portion 452 and the front shaft portion 453. An adjustment knob set screw portion 456 is formed at the center of the rear shaft portion 454. Two rotation stopper positioning holes 457 </ b> A and 457 </ b> B are formed in the peripheral portion of the adjustment knob set screw portion 456 in the rear shaft portion 454. In the illustrated embodiment, two rotation stopper positioning holes are provided, but the number of rotation stopper positioning holes may be one, or two or more. Further, instead of providing the rotation stopper positioning hole, an irregular positioning structure including a concave portion and a convex portion can be used, or the rear portion of the rotary stopper can be formed as an adjustment knob. . The plurality of rotation stopper positioning holes 457A and 457B are preferably provided point-symmetrically with respect to the central axis of the rotation stopper 450. The front ends of the cylindrical rotation stopper positioning pins 468A and 468B are disposed in the rotation stopper positioning holes 457A and 457B, respectively.

  Referring to FIG. 8, the rear surface of the rear body 420 has “CLEAN”, “1.5”, “2.0”, “CLEAN”, “1.5”, “2.0” indicating the position of the needle 150. The mark 420M is formed at an angular interval of 60 degrees, for example. The mark “CLEAN” indicates the CLEAN position (corresponding to the cleaning position, ie, 4.5 mm pulling of the needle). The mark “1.5” indicates the first discharge amount position (corresponding to the small discharge position, ie, 1.5 mm pulling of the needle). The mark “2.0” indicates the second discharge amount position (corresponding to the large discharge position, ie, 2.0 mm pulling of the needle). By using these three types of marks 420M, the three types of positions in the rotation direction of the set rotation stopper 450 can be confirmed.

  Six counterbores 461 to 466 are formed as “non-through holes (blind holes)” on the rear side of the base portion 452 of the rotation stopper 450. The center positions of the six counterbores 461 to 466 are preferably at equal distances with respect to the central axis of the rotation stopper 450 and at equal angular intervals. However, it is preferable that the bores 461 to 466 have the same inner diameter. The first counterbored hole 461 and the fourth counterbored hole 464 are formed to have the same depth. The second counterbored hole 462 and the fifth counterbored hole 465 are formed to have the same depth. The third counterbored hole 463 and the sixth counterbored hole 466 are formed to have the same depth. The first counterbored hole 461 and the fourth counterbored hole 464 are provided point-symmetrically with respect to the central axis of the rotation stopper 450. The second counterbored hole 462 and the fifth counterbored hole 465 are provided point-symmetrically with respect to the central axis of the rotation stopper 450. The third counterbore 463 and the sixth counterbore 466 are provided point-symmetrically with respect to the central axis of the rotation stopper 450.

  In the illustrated embodiment, two counterbores having three different depths are formed. For example, the first counterbored hole 461 and the fourth counterbored hole 464 are formed to have a depth of 3.5 mm, and are set as CLEAN positions (corresponding to the cleaning position, that is, 4.5 mm pulling of the needle). The The second counterbored hole 462 and the fifth counterbored hole 465 are formed to have a depth of 1.0 mm, and serve as a second discharge amount position (corresponding to a large discharge position, that is, 2.0 mm pulling of the needle). Is set. The third counterbored hole 463 and the sixth counterbored hole 466 are formed to have a depth of 0.5 mm, and serve as a first discharge amount position (corresponding to a small discharge position, ie, 1.5 mm pulling of the needle). Is set.

  Referring to FIGS. 8, 9, and 12, the adjustment knob 430 is disposed on the rear side of the rear protrusion 426 of the rear body 420. The adjustment knob 430 includes a disc-shaped base portion 432, a front recess portion 434 formed on the front side of the base portion 432, and an annular front shaft portion 435 formed in the front recess portion 434 on the front side of the base portion 432. including. A center hole portion 436 is formed in the center portion of the base portion 432 and the front shaft portion 435. An adjustment knob set screw plate 438 is formed at the center of the base 432. The rear convex portion 426 formed on the rear side of the rear body 420 is formed in a dimension shape that can move into the front concave portion 434 of the adjustment knob 430.

  Two rotation stopper pin hole portions 437A and 437B are formed in the peripheral portion of the center hole portion 436 in the front shaft portion 435. In the illustrated embodiment, two rotation stopper pin hole portions are provided, but the number of rotation stopper pin hole portions may be one or may be two or more. The plurality of rotation stopper pin holes 437A and 437B are preferably provided point-symmetrically with respect to the central axis of the rotation stopper 450. The positions where the rotation stopper pin holes 437A and 437B are provided are determined so as to correspond to the positions where the rotation stopper positioning holes 457A and 457B provided in the rotation stopper 450 are provided. The rear end portions of the rotation stopper positioning pins 468A and 468B are disposed in the rotation stopper pin hole portions 437A and 437B, respectively.

  Referring to FIG. 8, two marks 430 </ b> M for confirming the position of the rotation stopper 450 in the rotation direction are formed on the rear surface of the adjustment knob 430 at an angular interval of 180 degrees. By rotating and adjusting the adjustment knob 430 so that the mark 430M of the adjustment knob 430 and the mark 420M of the rear body 420 are aligned, the position of the rotation stopper 450 in the rotation direction can be confirmed.

  8 and 9, two rotation stopper positioning pins 432A and 432B are disposed in the front recess 424 of the base portion 422 of the rear body 420, and the rotation stopper positioning pins 432A, 432B is fixed to the rear protrusion 426. The front end portions of the rotation stopper positioning pins 468A and 468B are disposed in the rotation stopper positioning holes 457A and 457B, respectively, the rotation stopper 450 is disposed in the front recess 424 of the base portion 422 of the rear body 420, and the rear of the rotation stopper 450 The shaft portion 454 passes through the rear body center hole 420H, and the rear end portions of the rotation stopper positioning pins 468A and 468B are arranged in the rotation stopper pin holes 437A and 437B, respectively, and the adjustment knob set screw 430A Thus, the adjustment knob 430 is screwed and fixed to the rotation stopper 450.

  When the mark 430M of the adjustment knob 430 is set to a position corresponding to “CLEAN” of the mark 420M of the rear body 420, the rotation stopper positioning pins 432A and 432B are placed in the first and fourth counterbores 461 and 464, respectively. Configured to enter. When the mark 430M of the adjustment knob 430 is set at a position corresponding to “1.5” of the mark 420M of the rear body 420, the rotation stopper positioning pins 432A and 432B are provided with the third counterbored hole 463 and the sixth counterbored hole 466, respectively. Configured to go inside. When the mark 430M of the adjustment knob 430 is set to a position corresponding to “2.0” of the mark 420M of the rear body 420, the rotation stopper positioning pins 432A and 432B are provided with the second counterbored hole 462 and the fifth counterbored hole 465, respectively. Configured to go inside.

  Referring to FIG. 1, the adjustment knob 430 is moved forward so that the rotation stopper positioning pins 432A and 432B can come out of the counterbored holes. In this state, the adjustment knob 430 is rotated, and the adjustment knob 430 is moved rearward so that the rotation stopper positioning pins 432A and 432B enter any of the counterbored holes, thereby positioning the rotation stopper positioning pins 432A and 432B. be able to.

  Referring to FIGS. 1, 3, 4, and 9, the base portion 422 of the rear body 420 is screwed and fixed to the rear end portion of the gun body 112 by rear body fixing bolts 192 </ b> A and 192 </ b> B. With this configuration, the axial position of the needle 150 and the axial position of the front piston 170 can be accurately adjusted to three positions. That is, in the configuration of the present invention, even if the adjustment knob 430 is rotated and the axial position of the needle 150 and the axial position of the front piston 170 are switched many times, The position of the piston 170 in the axial direction can be adjusted to the same position, and a delicate adjustment work like a conventional screw type is not required.

  1 to 12, in the illustrated embodiment, a structure in which six counterbores 461 to 466 are formed as “non-through holes (blind holes)” on the rear side of the base portion 452 of the rotation stopper 450 will be described. However, the number of counterbores may be two or three or more. When forming a plurality of counterbores, the counterbores are preferably provided at equal distances with respect to the central axis of the rotation stopper 450. In the illustrated embodiment, the structure in which the counterbored holes 461 to 466 are formed in the base portion 452 of the rotation stopper 450 has been described. However, the counterbored hole may be provided in the rear body, and the rotation stopper positioning pin may be provided in the rotation stopper. it can.

  In the illustrated embodiment, the structure in which the counterbore and the rotation stopper positioning pin are provided has been described. However, the rotation is caused by the recess provided in one of the rotation stopper and the rear body and the protrusion provided in the other of the rotation stopper and the rear body. It is also possible to position the stopper in the axial direction. Further, in the illustrated embodiment, the structure for connecting the component parts by screws and bolts has been described. However, the fixing method and connection shape may be a key, a bayonet, or any other arbitrary A known method may be used.

  The needle 150 is configured to be able to move in the front-rear direction along the nozzle center axis 114 </ b> A together with the front piston 170. When the needle 150 moves rearward, the coating material ejection hole 122 can be opened by the front end portion of the needle 150. When the needle 150 moves forward, the coating material ejection hole 122 can be closed by the front end portion of the needle 150. As described above, when pressurized air is not introduced into the front piston operating chamber 176, the front piston 170 is moved forward by the elastic force of the needle spring 174, and the needle tip 150C of the needle 150 passes through the paint ejection hole 122. Configured to close.

  The total length of the needle 150 can be set to 66 mm, for example, and 10 mm can be configured to enter the front piston 170. The diameter of the needle 150 can be set to 4 mm, for example. The total length of the state in which the needle 150 is bonded and fixed to the front piston 170 can be configured to be, for example, 73.5 mm. The relationship between the tip of the nozzle 114 and the tip of the needle 150 is preferably a plane.

  By setting the dimensions in this way, a gun body 112 having a total length of 60 mm incorporates a nozzle 114 having a total length of 28 mm, and using a needle 150 and a front piston 170 having a total length of 73.5 mm, a two-stage operation unit. Can be set.

  Referring to FIGS. 1 to 5, a gun paint channel 320 for distributing paint is provided inside the gun unit 110 and the bracket unit 210. The gun paint channel 320 includes an outlet side portion 320A, a gun body inner portion 320B, a bracket unit inner portion 320C, and a bracket inlet side portion 320D. The outlet side portion 320 </ b> A of the gun paint channel 320 is disposed between the inner wall of the nozzle 114 and the needle 150. The downstream side of the gun paint flow path 320 is configured to flow through the paint ejection hole 122.

  It is configured such that the paint can be fed from the bracket inlet side portion 320D, which is the inlet side end of the gun paint flow path 320, toward the paint ejection hole 122. In this configuration, the needle 150 is a needle valve disposed in the gun paint channel 320. Therefore, the tip of the needle valve is configured to be able to open and close the paint ejection hole 122.

  A paint return channel 324 for returning the paint is provided inside the gun unit 110. The paint return flow path 324 includes a return port side portion 324A, a gun body inner portion 324B, a bracket unit inner portion 324C, and a bracket outlet side portion 324D. The outlet side end portion 324 </ b> D of the paint return channel and the bracket outlet side portion 324 </ b> D of the gun paint channel 320 are disposed at the rear portion of the bracket unit 210.

  An atomizing air flow path 330 for circulating atomizing air is provided inside the gun unit 110 and the bracket unit 210. The atomizing air flow path 330 includes an outlet side portion 330A, a gun body inner portion 330B, a bracket unit inner portion 330C, and a bracket inlet side portion 330D. The outlet side portion 330 </ b> A of the atomizing air flow path 330 is disposed outside the outer wall of the nozzle 114. The downstream side of the atomizing air flow path 330 is configured to flow through the main atomizing air hole 125. The atomizing air can be sent from the bracket inlet side portion 330 </ b> D which is the inlet side end of the atomizing air flow path 330 toward the main atomizing air hole 125. Referring to FIG. 3, the bracket inlet side portion 330 </ b> D of the atomizing air flow path 330 is disposed at the rear portion of the bracket unit 210. Further, the downstream side of the atomizing air flow path 330 can be configured to flow into the sub-atomizing air hole 124. This sub-atomization air hole is auxiliary, and a structure without this sub-atomization air hole can also be used.

  A pattern air flow path 340 for circulating pattern air is provided inside the gun unit 110. The pattern air flow path 340 includes an outlet side portion 340A, a gun body inner portion 340B, a bracket unit inner portion 340C, and a bracket inlet side portion 330D. The outlet side portion 340 </ b> A of the pattern air flow path 340 is disposed inside the inner wall of the retaining ring 128. The downstream side of the pattern air flow path 340 is configured to flow into the pattern air hole 126. Pattern air can be sent from the inlet side portion 340D of the pattern air flow path 340 toward the pattern air hole 126. An inlet side end portion 340 </ b> D of the pattern air flow path 340 is disposed at the rear portion of the bracket unit 210.

  A front piston operating air flow path 350 is provided inside the gun unit 110 for circulating paint spraying operating air that moves the needle 150 backward when the paint is ejected. The front piston operating air flow path 350 includes a gun body inner portion 350B, a bracket unit inner portion 350C, and a bracket inlet side portion 350D. The downstream side of the front piston operating air flow path 350 is configured to flow into a front piston operating chamber 176 provided in front of the front end portion of the front piston 170. The front piston operating air flow path 350 is configured to be able to send the operating air to the front piston operating chamber 176 from the inlet side end. In this configuration, the valve opening / closing device is a piston that is operated by the front piston operating air sent to the front piston operating chamber 176. Referring to FIG. 3, the inlet side portion 350 </ b> D of the front piston operating air flow path 350 is disposed at the rear portion of the bracket unit 210.

  Furthermore, by disposing the needle seal kit 160 as far as possible, the front piston 170 can be moved straight back along the nozzle center axis 114A. In addition, the cleaning efficiency can be improved by reducing the color pool (volume of the flow path) in the gun body 112 as much as possible. Furthermore, by providing a taper portion at the rear portion of the nozzle 114, the gap between the nozzle 114 and the needle 150 can be set narrow, and the cleaning can be performed reliably and the cleaning efficiency can be improved.

(3) Configuration of bracket unit:
1 to 3, the bracket unit 210 includes a bracket body 212 that constitutes a base member of the bracket unit. The bracket unit inner portion 320C and the bracket inlet side portion 320D of the gun paint channel 320 are provided in the bracket body 212. The bracket unit 210 is detachably fixed to the gun body 112. The bracket inlet side portion 320D is preferably constituted by a straight screw, and a counterbored O-ring (preferably made of perfloated) is disposed behind the screw. When the bracket unit 210 is fixed to the gun body 112, the paint and air received by the bracket unit 210 are configured to circulate to the gun body 112.

  A bracket unit inner portion 350C and a bracket inlet side portion 350D of the front piston operating air flow path 350 for allowing the front piston operating air to flow are provided in the bracket main body 212. A front piston operating air joint (not shown) is provided in the inlet side portion 350 </ b> D of the front piston operating air flow path 350. The front piston operating air joint is connected to an operation panel (not shown) via a piping member such as tube piping (not shown), and further communicates with the front piston operating air supply source from the operation panel. it can.

  The configuration is such that the working air can be introduced into the spray device 100 from the inlet side portion 350 </ b> D of the front piston working air flow path 350. When the bracket unit 210 is fixed to the gun unit 110, the inlet side end portion of the gun body inner portion 350B of the front piston operating air flow path 350 is connected to the outlet side end portion of the bracket unit inner portion 350C. Is done. It is preferable to arrange an O-ring at this connection portion. The O-ring may be provided in the bracket unit 210, may be provided in the gun unit 110, or may be provided in both. The inlet side portion 350D may be constituted by a taper screw. A solenoid valve (not shown) is provided in the front piston operating air flow path 350. By opening a solenoid valve (not shown), the front piston operating air introduced into the front piston operating chamber 176 can be discharged.

  The bracket unit inner portion 330 </ b> C and the bracket inlet side portion 330 </ b> D of the atomizing air flow path 330 are provided in the bracket main body 212. An atomizing air joint (not shown) is provided in the inlet side portion 330 </ b> D of the atomizing air flow path 330. The atomized air supply source and the atomized air joint can be coupled using a piping member such as a connection hose (not shown). The inlet side portion 330D may be formed of a taper screw. It is comprised so that working air can be introduce | transduced into the spray apparatus 100 from the entrance side part 330D of the atomization air flow path 330. FIG. When the bracket unit 210 is fixed to the gun unit 110, the inlet side end of the gun body inner portion 330B of the atomizing air flow path 330 is connected to the outlet side end of the bracket unit inner portion 330C. The It is preferable to arrange an O-ring at this connection portion. The O-ring may be provided in the bracket unit 210, may be provided in the gun unit 110, or may be provided in both.

  The bracket unit inner portion 340C and the bracket inlet side portion 330D of the pattern air flow path 340 are provided in the bracket body 212. A pattern air joint (not shown) is provided in the inlet side portion 340D of the pattern air flow path 340. The pattern air supply source and the pattern air joint can be coupled using a piping member such as a connection hose (not shown). The inlet side portion 340D is preferably constituted by a taper screw. It is comprised so that working air can be introduce | transduced into the spray apparatus 100 from entrance side part 340D of the pattern air flow path 340. FIG. When the bracket unit 210 is fixed to the gun unit 110, the inlet side end of the gun body inner portion 340B of the pattern air flow path 340 is configured to be connected to the outlet side end of the bracket unit inner portion 340C. . It is preferable to arrange an O-ring at this connection portion. The O-ring may be provided in the bracket unit 210, may be provided in the gun unit 110, or may be provided in both.

  The bracket unit inner portion 320C and the bracket inlet side portion 320D of the gun paint channel 320 are provided in the bracket body 212. A paint inlet joint (not shown) is provided in the bracket inlet side portion 320 </ b> D of the gun paint flow path 320. The bracket inlet side portion 320D is preferably constituted by a straight screw, and a counterbored O-ring (preferably made of perfloated) is disposed behind the screw. The paint supply source and the paint inlet joint can be connected using a piping member such as a connection hose (not shown). The paint can be introduced into the spray device 100 from the bracket inlet side portion 320D of the gun paint flow path 320. When the bracket unit 210 is fixed to the gun unit 110, the inlet side end portion of the gun body inner portion 320B of the gun paint channel 320 is configured to be connected to the outlet side end portion of the bracket unit inner portion 320C. . It is preferable to arrange an O-ring at this connection portion. That is, when the bracket unit 210 is fixed to the gun unit 110, the paint received by the bracket unit 210 is configured to flow to the gun unit 110. The O-ring may be provided in the bracket unit 210, may be provided in the gun unit 110, or may be provided in both.

  A bracket unit inner portion 324C and a bracket outlet side portion 324D of the paint return channel 324 are provided in the bracket body 212. A paint return joint (not shown) is provided in the bracket outlet side portion 324D of the paint return channel 324. The paint supply source (or paint tank) and the paint return joint can be connected using a piping member such as a connection hose (not shown). It is configured so that the paint can be discharged from the bracket outlet side portion 324D of the paint return channel 324. The bracket outlet side portion 324D is formed of a straight screw, and a counterbored O-ring (preferably made of perfloated) is preferably disposed behind the screw. When the bracket unit 210 is fixed to the gun unit 110, the outlet side end portion of the gun body inner portion 324B of the paint return channel 324 is configured to be connected to the inlet side end portion of the bracket unit inner portion 324C. . It is preferable to arrange an O-ring at this connection portion. The O-ring may be provided in the bracket unit 210, may be provided in the gun unit 110, or may be provided in both.

  Further, referring to FIGS. 6 and 7, a rear piston is further moved forward and held during operation other than when the nozzle 114 is cleaned in order to correspond to an air-type two-stage spray device described later. A rear piston operating air flow path 360 for circulating piston operating air can be provided. Rear piston operating air flow path 360 includes a rear body inner portion 360A, a gun body inner portion 360B, a bracket unit inner portion 360C, and a bracket inlet side portion 350D. The downstream side of the rear piston operating air flow path 360 is configured to flow into a rear piston end chamber 186 provided behind the rear piston main body 180B. Cleaning operation air can be sent to the rear piston end chamber 186 from the inlet side end of the rear piston operation air flow path 360.

  An inlet side portion 360 </ b> D of the rear piston operating air flow path 360 is disposed at the rear portion of the bracket unit 210. When the rear body is fixed to the gun body 112, the inlet side end portion of the rear body inner portion 360A of the front piston operating air flow path 350 is configured to be connected to the outlet side end portion of the gun body inner portion 360B. It is preferable to arrange an O-ring at this connection portion. The O-ring may be provided on the rear body, or may be provided on the gun body 112 or on both.

  In the spray device according to the present invention, each of the gun paint flow paths 320, the paint return flow paths 324, the atomizing air flow paths 330, the pattern air flow paths 340, the front piston operating air flow paths 350, the rear piston operating air flows. For example, the path 360 can be set to an appropriate value in the range of 2 mm to 10 mm in inner diameter. These inner diameters can be set to appropriate values by performing simulation analysis, trial production, etc. in consideration of the viscosity of the fluid to be atomized and the atomization state.

  Referring to FIG. 3, in the spray device according to the present invention, the bracket inlet side portion 320 </ b> D of the gun paint channel 320, the bracket outlet side portion 324 </ b> D of the paint return channel 324, and the bracket inlet side portion 330 </ b> D of the atomizing air channel 330. The bracket inlet side portion 340D of the pattern air flow path 340, the bracket inlet side portion 350D of the front piston operating air flow path 350, and the bracket inlet side portion 360D of the rear piston operating air flow path 360 are formed on one surface of the bracket unit 210, For example, it is preferably provided on the rear surface. Referring to FIG. 1, the surface located behind the bracket unit 210 is composed of three planes that form angles. In each of the three planes, a bracket inlet side portion 320D of the gun paint channel 320, a bracket outlet side portion 324D of the paint return channel 324, a bracket inlet side portion 330D of the atomizing air channel 330, and a pattern air channel 340 are provided. One, two, or three of the bracket inlet side portion 340D, the bracket inlet side portion 350D of the front piston operating air flow channel 350, and the bracket inlet side portion 360D of the rear piston operating air flow channel 360 may be disposed. it can. With this configuration, the paint and air can be supplied to the spray device quickly and reliably in a stable state. Also, with this configuration, it is easy to attach and detach the tube piping that supplies the paint and air, and the attachment and detachment time of the tube piping is short, and the maintenance work time can be shortened.

  When the spray device according to the present invention is applied to liquids such as water, liquid type adhesives, liquid type rust preventives, liquid type insulating agents, liquid type coating agents, liquid type chemicals, etc., they should be sprayed. The liquid supply source and the paint inlet joint (that is, a joint configured as a “liquid inlet joint” in such a case) may be coupled using a piping member such as a connection hose (not shown). it can. Since the spray device of the present invention has a unit structure including a gun unit and a bracket unit, the manufacturing process of each component is simple, and the assembly of the components is easy.

  The spray device according to the present invention is configured as a plate-type gun. In this structure, the plate is fixed when the gun is attached, whether the gun is used in a fixed manner, the gun is held by the robot, or the gun is attached to the reciprocating device. When maintaining the gun, it is possible to remove only the gun body, overhaul, replace parts, or replace the body. With this configuration, it is possible to avoid the trouble that the gun cannot be installed in the original position at the time of installation by removing the tube (hose) generated in the conventional gun, and it is possible to shorten the working time.

  In the present embodiment, the structure in which the gun unit is fixed to the bracket unit with the hexagon socket head cap bolt is illustrated and described, but a one-touch type (90-degree rotation type) structure can also be used.

(4) Painting work with spray equipment:
Referring to FIG. 1, the spray device 100 can be used in a fixed manner, can be used with a robot having an automatic spray gun, or one or a plurality of devices in a device called “reciprocator”. It can be used with an automatic spray gun attached, or it can be used in combination with the above-described configuration.

  As a paint applied to the spray device 100, a solid paint can be used, and a metallic paint can also be used. Moreover, the coating material containing an organic solvent can be used. Moreover, the coating material containing aluminum powder can be used. For example, the gun unit 110 of the spray device 100 is fixed to the robot arm. Fastening members such as bolts and nuts can be used for this fixing. Alternatively, the bracket unit 210 can be fixed to the gun unit 110 after the gun unit 110 of the spray device 100 is fixed to the robot arm. In this case, the connection hose (not shown) can be connected to the bracket unit 210 after the bracket unit 210 is fixed to the gun unit 110, or the bracket unit 210 is connected after the connection hose is connected to the bracket unit 210. It can also be fixed to the gun unit 110.

  Referring to FIGS. 1 and 8, when the mark 430M of the adjustment knob 430 is set to a position corresponding to “1.5” of the mark 420M of the rear body 420 during the painting operation, the rotation stopper positioning pins 432A and 432B are set. Enters the third counterbored hole 463 and the sixth counterbored hole 466. Further, when the mark 430M of the adjustment knob 430 is set to a position corresponding to “2.0” of the mark 420M of the rear body 420, the rotation stopper positioning pins 432A and 432B have the second counterbored hole 462 and the fifth counterbored hole 465, respectively. It has come to enter.

  Front piston operating air is introduced into the front piston operating chamber 176 via the front piston operating air flow path 350 from the front piston operating air supply source through the connection hose. When the front piston operating air is introduced into the front piston operating chamber 176, the needle 150 and the front piston 170 come together and move backward along the nozzle center axis 114A against the spring force of the needle spring 174. The cylindrical portion that moves and is located behind the front piston shaft 170A moves backward in the inner peripheral portion of the cylindrical portion that is located in front of the rotation stopper 450, and is located behind the front piston shaft 170A. The end surface of the tip portion of the cylindrical portion maintains a state of contacting the step portion in the inner peripheral portion of the cylindrical portion located in front of the rotation stopper 450. As the front piston operating air, for example, compressed air of about 0.25 MPa to 0.35 MPa can be used. The amount by which the needle 150 can move backward can be set to 2 mm, for example.

  When the needle 150 moves rearward, the paint ejection hole 122 opens. The paint can be supplied from the paint supply channel 320 to the nozzle 114 through a piping member such as a connection hose from the supply source of the paint, and the paint can be ejected from the paint ejection hole 122.

  At this time, the atomization air is introduced from the supply source of the atomization air through the connection hose, the atomization air flow path 330, and through the main atomization air hole 125 (and, if necessary, the sub atomization air By spraying atomized air through the holes 124, the paint sprayed from the paint spray holes 122 can be atomized. As the atomizing air, for example, compressed air of about 0.25 MPa can be used. The atomization state of the paint can be adjusted by changing the atomizing air pressure and the number and arrangement of the sub-atomizing air holes 124.

  Simultaneously, the pattern air is introduced from the pattern air supply source through the connection hose through the pattern air flow path 340, and the pattern air is ejected from the pattern air holes 126, thereby forming an atomized paint pattern. be able to. As the pattern air, for example, compressed air of about 0.25 MPa can be used. The pattern shape of the paint can be adjusted by changing the pressure of the pattern air and the number and arrangement of the pattern air holes 126.

  The paint discharged from the tip of the nozzle 114 is normally atomized by the atomizing air of the air cap 120 and formed as a fan-shaped discharge pattern by the pattern air. If the needle 150 is not positioned at the center of the nozzle 114, the discharge state of the paint discharged from the tip of the nozzle 114 is not stable. In the present invention, as described above, by disposing the needle seal kit 160 as far as possible, the front piston 170 can be moved straight back along the nozzle center axis 114A. In the present invention, as will be described later, the rear piston main body 180B and the needle stopper 180C of the rear piston 180 disposed on the rear side serve to receive the front piston 170, and the rear piston 180 itself is attached to the rear cap ring 172. Further, the rear body 190 is surely disposed on the nozzle center axis 114A, and the front piston 170 can be moved straight back along the nozzle center axis 114A. Therefore, according to the configuration of the present invention, the needle 150 can be positioned at the center of the nozzle 114, and the rear piston 180 can be moved straight back along the nozzle center axis 114A. In addition, durability against wear of the needle 150 can be improved.

  The remaining paint not ejected from the paint ejection hole 122 can be returned to the paint supply source (or paint tank) via the paint return channel 324 and the connection hose. In this way, a paint circulation line can be constructed. Alternatively, by using the spray device of the present invention, not only paints but also various liquids such as water, adhesives, rust preventives, insulating agents, coating agents and chemicals can be sprayed automatically or manually. .

  When finishing the painting operation, the supply of the front piston operating air is stopped, and the needle 150 and the front piston 170 are moved forward together by the spring force of the needle spring 174. When the needle 150 moves forward, the paint ejection hole 122 is closed, and the ejection of paint from the paint ejection hole 122 can be stopped. At the same time, the supply of atomizing air can be stopped and the supply of pattern air can be stopped.

(5) Nozzle cleaning:
Referring to FIGS. 1 and 8, when cleaning the nozzle of the spray gun body, the mark 430M of the adjustment knob 430 is set to a position corresponding to “CLEAN” of the mark 420M of the rear body 420. In this state, the rotation stopper positioning pins 432 </ b> A and 432 </ b> B enter the first counterbored hole 461 and the fourth counterbored hole 464. When cleaning the nozzle of the spray gun body, the gun unit 110 of the spray device 100 can be removed from the robot arm and the nozzle 114 can be cleaned. Alternatively, the nozzle 114 can be cleaned with the gun unit 110 of the spray device 100 attached to the robot arm.

  Referring to FIG. 13, in a state where the front piston operating air is introduced from the front piston operating air supply source into the front piston operating chamber 176, the needle 150 and the front piston 170 are combined to resist the spring force of the needle spring 174. Thus, the state of moving backward along the nozzle center axis 114A is maintained. At this time, the amount by which the needle 150 can move backward can be set to 3 mm, for example. Therefore, with this configuration, the amount by which the needle 150 can move backward from the state in which the nozzle 114 is closed to the nozzle cleaning state can be set to 5 mm, for example.

  As described above, the spray device according to the present invention can set the opening of the discharge port to two kinds of positions for painting and one kind for washing in total, which greatly increases the washing time. It is possible to improve performance, such as reducing the operating efficiency. In the spray device of the present invention, it is possible to manually set the needle position to full open by operating the adjustment knob. In addition, when returning the needle position to the original position, it is possible to manually return the needle position to the original position by operating the adjustment knob. Moreover, in the spray apparatus of this invention, the needle position at the time of a painting always becomes a fixed position, There exists an effect that the quality of to-be-coated object (product) can be kept constant. In addition, since the spray device of the present invention has a detachable unit structure, it is easy to manufacture and assemble parts constituting each unit.

(6) Air type two-stage spraying device:
(6-1) State in which nozzle is closed Hereinafter, the configuration and operation in the case where an air type two-stage spraying device is configured using the gun unit of the present invention will be described. Referring to FIG. 16, the rear cap ring 172 is disposed behind the gun body 112. A needle spring 174 is arranged to push the front piston body 170B forward. The rear portion of the needle spring 174 is disposed so as to contact the flat portion facing the front of the rear cap ring 172. The front portion of the needle spring 174 is disposed so as to contact the rear facing portion of the front piston flange 170F of the front piston body 170B. The center axis of the needle spring 174 may be disposed on the nozzle center axis 114A. Due to the elastic force of the needle spring 174, the front piston 170 receives a force in the direction of moving forward. Therefore, when pressurized air is not introduced into the front piston working chamber 176, the front piston 170 moves forward, and the needle tip 150C of the needle 150 is configured to close the paint ejection hole 122.

  The rear body 190 is fixed behind the gun body 112 by a rear body fixing bolt 192. For example, the rear body 190 can be fixed to the gun body 112 using two rear body fixing bolts 192. The rear cap ring 172 is disposed inside the rear body 190. The rear body 190 is preferably formed of, for example, POM (polyoxymethylene).

  Referring to FIG. 16, the gun unit 110 further includes a rear piston 180 movable along the nozzle center axis 114A. The rear piston 180 is disposed behind the front piston 170 inside the rear body 190. Rear piston 180 includes a rear piston main body 180B and a rear piston shaft portion 180G. A rear piston hole 180H is provided in a part of the rear piston shaft portion 180G from the front of the rear piston main body 180B. Needle stopper 180C is fixed to rear piston hole 180H. The rear piston O-ring 180D is disposed in a groove on the outer peripheral portion of the rear piston main body 180B. The center axis of the rear piston 180 is disposed on the nozzle center axis 114A. The outer peripheral part of the cylindrical part located behind the front piston shaft 170A is slidably disposed in the inner peripheral part of the cylindrical part located in front of the needle stopper 180C. The outer peripheral part of the cylindrical part located behind the needle stopper 180C is fixed in the inner peripheral part of the hole located in front of the rear piston main body 180B. The plane portion facing the front of the rear piston main body 180B is disposed so as to contact the plane portion facing the rear of the rear cap ring 172.

  A rear piston end chamber 186 for receiving the rear piston operating air for moving the rear piston 180 forward along the nozzle center axis 114A is configured in the rear body 190 behind the rear piston main body 180B. Further, a rear piston operating chamber 188 for introducing the rear piston operating air received in the rear piston end chamber 186 and pushing the wall surface behind the rear piston main body 180B is provided with a shaft portion at the rear of the rear piston main body 180B. Outside, it is configured within the rear body 190.

  The rear piston O-ring 180D is disposed in a groove provided in the outer peripheral portion of the rear piston main body 180B. The rear piston O-ring 180D is provided to seal the rear piston main body 180B and the rear body 190. The rear piston O-ring 180D preferably uses an O-ring to increase the sliding resistance in order to receive the front piston 170. The rear piston O-ring 180D is preferably formed of perflo.

  The rear piston main body 180B can be formed of an aluminum alloy A2021 (for example, alumite treatment may be performed). The outer diameter of the front piston 170 is preferably configured to be smaller than the outer diameter of the rear piston 180. Therefore, the outer diameter of front piston packing 170C is preferably configured to be smaller than the outer diameter of rear piston O-ring 180D.

  The needle 150 is configured to be able to move in the front-rear direction along the nozzle center axis 114 </ b> A together with the front piston 170. When the needle 150 moves rearward, the coating material ejection hole 122 can be opened by the front end portion of the needle 150. When the needle 150 moves forward, the coating material ejection hole 122 can be closed by the front end portion of the needle 150. Further, the needle 150, the front piston 170, and the rear piston 180 can be moved together from the position where the needle 150 is moved rearward together with the front piston 170, and can be further moved rearward along the nozzle center axis 114A. Is done.

  The total length of the needle 150 can be set to 66 mm, for example, and 10 mm can be configured to enter the front piston 170. The diameter of the needle 150 can be set to 4 mm, for example. The total length of the state in which the needle 150 is bonded and fixed to the front piston 170 can be configured to be, for example, 73.5 mm. The relationship between the tip of the nozzle 114 and the tip of the needle 150 is preferably a plane.

  By setting the dimensions in this manner, the gun body 112 having a total length of 60 mm incorporates the nozzle 114 having a total length of 28 mm, and using the needle 150 and the front piston 170 having a total length of 73.5 mm, the rear piston having a total length of 26 mm. By adjusting the rear cap ring 172 having a width of 4 mm, the dimensions of the rear piston 180, and the hole depth of the needle stopper 180C inside the main body 180B, for example, one step of 2 mm can be set. Further, by adjusting the dimensions of the rear body 190, the rear cap ring 172 having a width of 4 mm, and the dimensions of the operating portion of the rear piston 180, for example, a 3-mm two-stage pulling operating portion can be set.

  The cylinder inner diameter of the front piston 170 is 22 mm, for example. The inner diameter of the rear piston 180 is, for example, 24 mm.

  A rear piston operating air flow path (not shown) for circulating the rear piston operating air for moving the rear piston 180 further forward and holding it during operation other than when cleaning the nozzle 114 is provided inside the rear body 190. Provided. The downstream side of the rear piston operating air flow path is configured to flow into a rear piston end chamber 186 provided behind the rear piston main body 180B. Cleaning operation air can be sent to the rear piston end chamber 186 from the inlet side end of the rear piston operation air flow path.

  An inlet side portion of the rear piston operating air flow path is disposed at a rear portion of the bracket unit 210. When the rear body 190 is fixed to the gun body 112, the inlet side end portion of the rear body inner portion of the front piston operating air flow path is connected to the outlet side end portion of the gun body inner portion. It is preferable to arrange an O-ring at this connection portion. The O-ring may be provided on the rear body 190, may be provided on the gun body 112, or may be provided on both.

  Referring to FIG. 16, the rear body 190 has two bolt holes that allow the rear body fixing bolts to pass therethrough. The rear body 190 further includes six air circulation holes 190K through which the rear piston end chamber 186 and the rear piston operation chamber 188 circulate. A plurality of air circulation holes 190K are preferably arranged concentrically around the nozzle center axis 114A. Although six air circulation holes 190K are shown, the number of air circulation holes may be four, eight, or any other number. The plurality of air circulation holes are preferably arranged concentrically about the nozzle center axis 114A and at equal angular intervals. By providing a plurality of air flow holes 190K concentrically, the rear piston 180 can be moved smoothly and reliably forward.

  The rear piston main body 180B and the needle stopper 180C of the rear piston 180 disposed on the rear side serve to receive the front piston 170, and the rear piston 180 itself is reliably mounted on the nozzle center axis 114A by the rear cap ring 172 and the rear body 190. It is arranged in. With this configuration, the front piston 170 can be moved straight back along the nozzle center axis 114A. Furthermore, in the configuration of the present invention, the rear piston 180 can be moved straight back along the nozzle center axis 114A.

(6-2) First Opening State of Nozzle Referring to FIG. 17, the rear piston operating air is supplied to the rear piston end chamber 186 through the rear piston operating air flow path from the rear piston operating air supply source through the connection hose. Introduce. The rear piston operating air introduced into the rear piston end chamber 186 passes through the plurality of air flow holes 190K and flows from the rear piston end chamber 186 into the rear piston operating chamber 188. When the rear piston operating air is introduced into the rear piston operating chamber 188, the rear piston 180 moves forward along the nozzle center axis 114A, and the plane portion facing the front of the rear piston main body 180B has a rear cap. A state in which the flat portion facing the rear of the ring 172 is in contact is maintained. As the rear piston operating air, for example, compressed air of about 0.4 MPa to 0.5 MPa can be used.

  Front piston operating air is introduced into the front piston operating chamber 176 via the front piston operating air flow path 350 from the front piston operating air supply source through the connection hose. When the front piston operating air is introduced into the front piston operating chamber 176, the needle 150 and the front piston 170 come together and move backward along the nozzle center axis 114A against the spring force of the needle spring 174. The cylindrical portion that moves and is positioned behind the front piston shaft 170A moves rearward in the inner peripheral portion of the cylindrical portion that is positioned in front of the needle stopper 180C, and is positioned behind the front piston shaft 170A. The end surface of the tip portion of the cylindrical portion maintains a state where it contacts the step portion in the inner peripheral portion of the cylindrical portion located in front of the needle stopper 180C.

  As the front piston operating air, for example, compressed air of about 0.25 MPa to 0.35 MPa can be used. The pressure of the rear piston operating air is set to be higher than the pressure of the front piston operating air. The difference between the pressure of the rear piston operating air and the pressure of the front piston operating air can be set to about 0.05 MPa to 0.25 MPa, for example. The amount by which the needle 150 can move backward can be set to 2 mm, for example.

  When the needle 150 moves rearward, the paint ejection hole 122 opens. The paint can be supplied from the paint supply channel 320 to the nozzle 114 through a piping member such as a connection hose from the supply source of the paint, and the paint can be ejected from the paint ejection hole 122.

  At this time, the atomization air is introduced from the supply source of the atomization air through the connection hose, the atomization air flow path 330, and through the main atomization air hole 125 (and, if necessary, the sub atomization air By spraying atomized air through the holes 124, the paint sprayed from the paint spray holes 122 can be atomized. As the atomizing air, for example, compressed air of about 0.25 MPa can be used. The atomization state of the paint can be adjusted by changing the atomizing air pressure and the number and arrangement of the sub-atomizing air holes 124.

  Simultaneously, the pattern air is introduced from the pattern air supply source through the connection hose through the pattern air flow path 340, and the pattern air is ejected from the pattern air holes 126, thereby forming an atomized paint pattern. be able to. As the pattern air, for example, compressed air of about 0.25 MPa can be used. The pattern shape of the paint can be adjusted by changing the pressure of the pattern air and the number and arrangement of the pattern air holes 126.

(6-3) Second open state of nozzle (state in which nozzle is washed)
The operation when cleaning the nozzle of the spray gun body will be described below. Referring to FIG. 18, in a state where the front piston operating air is introduced from the front piston operating air supply source into the front piston operating chamber 176, an electromagnetic valve (not shown) provided in the rear piston operating air flow path is opened. The rear piston operating air introduced into the rear piston end chamber 186 and the rear piston operating chamber 188 is discharged.

  As a result, the needle 150, the front piston 170, and the rear piston 180 come together, move backward along the nozzle center axis 114A against the spring force of the needle spring 174, and face the rear piston main body 180B. The planar portion to be maintained is in contact with the stepped portion inside the rear body. At this time, the amount by which the needle 150 can move backward can be set to 3 mm, for example. Therefore, with this configuration, the amount by which the needle 150 can move backward from the state in which the nozzle 114 is closed to the nozzle cleaning state can be set to 5 mm, for example.

  The above-mentioned spray device can easily realize any of the three types of spray devices of the conventional adjustment type, air type two-stage drawing, and manual type multi-stage type. That is, the synergy effect by using three types of spray devices can improve the value of the article (product) to be coated, and can be differentiated from general products. In addition, the manual multi-stage spray device of the present invention has one less air circuit than the air-type two-stage spray device (similar to the conventional adjustment-type spray device). ) In the case of using the conventional adjustment type spray device, there is an effect that the manual multi-stage type spray device of the present invention can be replaced without adding an air circuit. . In addition, since the spray device of the present invention has a detachable unit structure, it is easy to manufacture and assemble parts constituting each unit.

  The spray device of the present invention can be used in a fixed manner, or can be used with a robot having an automatic spray gun, or one or a plurality of automatic spray guns can be attached to a device called “reciprocating”. They can be attached and used, or they can be used in combination with the above-described configurations. The spray device of the present invention can reduce the downtime when cleaning the spray gun body, replacing the spray gun body, or replacing the nozzle, and can spray the paint with a short loss time. it can. In addition, the spray device of the present invention can reduce the downtime of the painting operation when cleaning the nozzle. Furthermore, the spray device of the present invention can spray not only paints but also various liquids such as water, adhesives, rust preventives, insulating agents, coating agents, and drugs. Since the spray device of the present invention is easy to manufacture and assemble components, it can be manufactured by a simple process.

DESCRIPTION OF SYMBOLS 100 Spray apparatus 110 Gun unit 112 Gun body 114 Nozzle 150 Needle 160 Needle seal kit 170 Front piston 174 Needle spring 176 Front piston working chamber 180 Rear piston 186 Rear piston end chamber 188 Rear piston working chamber 190 Rear body 210 Bracket unit 220 Hexagon hole Attached bolt 400 Spray device 420 Rear body 430 Adjustment knob 450 Rotation stopper

Claims (1)

In a spray device that sprays paint from the paint spray hole,
A nozzle having a paint ejection hole for atomizing and ejecting the paint;
A needle for opening and closing the paint spray hole;
A front piston fixed to the needle;
A needle spring provided to push the front piston toward the paint ejection hole;
A gun body that houses the nozzle and the front piston;
A rear body disposed behind the gun body;
A needle position adjusting mechanism for adjusting the position of the needle in the direction along the central axis of the nozzle;
A bracket unit detachably fixed to the gun body,
When the bracket unit is fixed to the gun body, the paint and air received by the bracket unit are configured to circulate in the gun body,
The needle position adjusting mechanism is configured to set the position of the front piston along the center axis of the nozzle corresponding to the rotation angle of the adjustment member and the adjustment member that can rotate about the center axis of the nozzle. A rotational position setting member,
The front piston moves along the central axis of the nozzle in a direction away from the paint spray hole together with the needle in a state where the needle position adjusting mechanism is adjusted and the discharge amount of the paint coming out from the paint spray hole is set. Then, the front piston and the needle together are configured to move in a direction away from the paint ejection hole,
The needle position adjusting mechanism is configured to set the position of the front piston along the center axis of the nozzle corresponding to the rotation angle of the adjustment member and the adjustment member that can rotate about the center axis of the nozzle. A rotation stopper, and the outer peripheral portion of the cylindrical portion of the front piston is slidably disposed in the inner peripheral portion of the cylindrical portion of the rotation stopper,
The rotation stopper is formed with a plurality of counterbores having different depths, and the rear body is provided with a rotation stopper positioning pin, and the adjustment knob is moved in a direction along the central axis of the nozzle to adjust the adjustment. The rotary stopper positioning pin is inserted into the counterbored hole by rotating a knob, and the rotary stopper positioning pin is fixed at a position along a central axis corresponding to the depth of the counterbored hole. Spray device to do.

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