JP4843257B2 - Air control valve and painting system - Google Patents

Abstract

An air control valve (26) capable of accurately and rapidly controlling the flow of a shaping air for suppressing the spread of a sprayed paint when a coating machine (2) comprises two systems of air supply passages (18a, 18b) for supplying the shaping air, comprising a first valve part and a second valve part. The total flow of the air from a main flow passage (24) is set by changing the cross sectional area of the flow passage based on the displacement of the first valve part, and the ratio of the air distributed to the two systems of air supply passages (18a, 18b) is set by changing the cross sectional area of the flow passage based on the displacement of the second valve part.

Description

  The present invention relates to an air control valve that controls shaping air that suppresses the spread of spray paint, and a coating system using the air control valve.

  Conventionally, since painting of automobile bodies requires strict coating quality, a rotary atomizing type coating machine capable of performing uniform and high-quality coating has been used. This coating machine is provided with a rotary atomizing head, and when the rotary atomizing head rotates, the paint is atomized and the automobile body is painted. Further, in this coating machine, coating is performed with a desired coating pattern by discharging shaping air from the rear outside of the rotary atomizing head to suppress the spread of the spray paint. Therefore, in this coating machine, waste of paint is suppressed by improving the application efficiency of spray paint, and a uniform coating film is formed to improve paint quality.

  By the way, when the coating conditions such as the shape of the object to be coated and the type of paint are different, it is necessary to obtain an optimum coating pattern corresponding to the coating condition. In that case, the amount of paint supplied to the rotary atomizing head, the rotational speed of the rotary atomizing head, and the like are changed, and the flow rate of the shaping air is controlled according to the change.

Conventionally, this type of coating machine has been proposed that can supply two or more types of shaping air with different discharge directions (see, for example, Patent Document 1). In this coating machine, the coating pattern is changed by using any one or both of the vortex flow discharged in a spiral shape and the conical air flow discharged in a conical surface shape as shaping air. In the rotary atomizer-type coating machine as described above, the pressure of the shaping air is controlled using, for example, an electro / pneumatic regulator having a throttle valve structure. Specifically, when an electro / pneumatic regulator is used, the output pressure is detected by a pressure sensor, and feedback control is performed so that the output pressure corresponds to the input signal, thereby adjusting the shaping air to a predetermined flow rate. .
JP 2002-224611 A

  However, in recent coating machines, the flow rate of shaping air is relatively large, and when the flow rate of shaping air is changed using an electro / pneumatic regulator, it takes time until the changed air flow rate becomes stable. . Accordingly, if the coating is performed without waiting for the air flow rate to stabilize, the thickness of the coating film varies. On the other hand, if painting is performed after the air flow rate is stabilized in order to avoid such a problem, paint is wasted and the coating efficiency is deteriorated. Also, as disclosed in Patent Document 1, when two types of shaping air are discharged, two electro / pneumatic regulators are required to control the flow rates of the air, so the flow rates of the air are unstable. Then, it becomes difficult to obtain an optimal coating pattern.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an air control valve and a coating system capable of controlling the flow rate of shaping air quickly and accurately.

In order to solve the above-described problem, in the invention described in claim 1, the mainstream connected to an air supply source is used in a coating machine having a plurality of supply air passages for supplying shaping air for suppressing the spread of spray paint. An air control valve capable of distributing and supplying road air to the plurality of air supply passages, a body having a valve body accommodating space, and provided in the body via a first slit-shaped through hole An air supply port that communicates with the valve body housing space and is connectable to the main flow path, and is provided in the body, communicates with the valve body housing space via a second slit-shaped through hole, and A plurality of exhaust ports each connectable to the air supply flow path, a hollow cylindrical valve rotor as a valve body accommodated rotatably in the valve body accommodation space, and a side wall of the valve rotor. , The first slit Air is allowed to pass from the through-hole side, and is formed by a first valve portion including a region having a first slot whose width changes in the rotor rotation direction, and a side wall of the valve rotor. A second valve portion including a region having a second slot in which air can pass from the hole side and whose width changes in the rotor rotation direction, and the flow path cross-sectional area is changed based on the rotation position of the first valve portion Thus, the total flow rate of air from the main flow path can be set, and the ratio of the air distributed to the plurality of supply air flow paths is set by changing the cross-sectional area of the flow path based on the rotational position of the second valve unit The gist of the air control valve is that it is possible.

  According to the first aspect of the present invention, the cross-sectional area of the flow path is changed based on the displacement of the first valve portion of the air control valve, and the total flow rate of air from the main flow path is set. Further, the flow passage cross-sectional area is changed based on the displacement of the second valve portion, and the ratio of air distributed to the plurality of supply air flow passages (a ratio of 0% to 100%) is set. In this case, for example, the flow rate of the shaping air according to the coating pattern can be accurately switched by a two-stage adjustment mechanism (first valve portion and second valve portion) that changes the cross-sectional area of the air supply passage. In addition, the flow rate of the shaping air can be stabilized in a short time compared to the conventional case where the shaping air is controlled using an electro / pneumatic regulator. Therefore, when the air control valve of the present invention is applied to a coating machine, the coating efficiency and the coating quality can be improved.

  According to a second aspect of the present invention, there is provided a coating machine having a plurality of air supply passages for supplying shaping air for suppressing the spread of spray paint, the air control valve according to the first aspect, and the first of the air control valves. An actuator attached to the air control valve for driving the one valve portion and the second valve portion, and the shaping air pattern by driving the first valve portion and the second valve portion by the actuator The gist of the paint system that can be changed.

  According to the second aspect of the present invention, the actuator is attached to the air control valve according to the first aspect, and the first valve portion and the second valve portion are driven by the actuator. By this driving, the total flow rate of air from the main flow path is set and the ratio of air distributed to the plurality of supply air flow paths is set, and the pattern of the shaping air is accurately changed. In this way, if the pattern change of the shaping air is performed by the air control valve, the flow rate of the shaping air after the pattern change can be stabilized in a short time, realizing a coating system with excellent coating efficiency and coating quality. can do.

  In the painting system in which the painting machine is a robot-mounted type, it is preferable that the air control valve and the actuator are arranged in the robot-mounted type painting machine. In this way, for example, when the coating machine is a rotary atomizing type, the shaping air is formed into an appropriate pattern according to changes in the amount of paint supplied to the rotary atomizing head and the rotational speed of the rotary atomizing head. It is possible to switch patterns instantly.

  The gist of the invention described in claim 3 is that, in claim 2, the first valve portion and the second valve portion are driven by a common actuator.

  According to the third aspect of the invention, since the first valve portion and the second valve portion can be driven by a common actuator, the pattern change can be performed more accurately and with high reproducibility. In addition, a low-cost, compact, and lightweight system can be constructed as compared with a coating system that drives the first valve portion and the second valve portion with separate actuators. In this case, it becomes easy to arrange the air control valve and the actuator on the robot-mounted coating machine or the robot arm.

  The gist of the invention of claim 4 is that, in claim 2 or 3, the actuator is a control motor housed in an explosion-proof case.

  According to the fourth aspect of the present invention, the first valve portion and the second valve portion of the air control valve can be accurately driven by electrically driving the control motor. Further, by storing the control motor in the explosion-proof case, the control motor can be isolated from the environment outside the case. Examples of such control motors include servo motors and stepping motors.

  As described in detail above, according to the first to fourth aspects of the invention, the flow rate of the shaping air can be quickly and accurately controlled, and the coating efficiency of the coating machine can be improved and the coating quality can be improved. can do.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic configuration diagram of a coating system in the present embodiment.

  As shown in FIG. 1, the coating system 1 sets a flow rate of a coating machine 2, a paint supply device 3 for supplying paint, an air supply device 4 for supplying shaping air, and a shaping air flow rate. And a control device 6 for controlling the paint supply device 3 and the valve unit 5.

  The control device 6 is configured by a known computer including a CPU, a ROM, a RAM, an input / output circuit, and the like. The control device 6 is electrically connected to the paint supply device 3 and the valve unit 5 and controls them by various control signals. The coating machine 2 is a rotary atomizing type coating machine, and includes a rotary atomizing head 11 for atomizing an organic solvent-based paint. The rotary atomizing head 11 is provided at the tip of a rotary shaft 12 that is rotated by a rotary motor (air motor built in the coating machine main body) (not shown). The painting machine 2 of the present embodiment is a robot-mounted painting machine, which is fixed to the tip of an arm of a painting robot (not shown), and the painting robot drives the arm so that the position and painting direction of the painting machine 2 are changed. Be changed.

  The paint supply device 3 includes a cylinder device that is filled with paint, a motor that drives the cylinder device, and the like, and discharges a predetermined amount of paint based on a control signal of the control device 6. The paint supply device 3 is also mounted on the arm of the painting robot. The paint discharged from the paint supply device 3 is supplied to the coating machine 2 through the paint pipe 14, and is further rotated and atomized through a paint supply path (not shown) formed inside the paint machine 2. 11 is supplied. Then, the paint is atomized by the centrifugal force applied to the rotating rotary atomizing head 11, and coating is performed.

  Moreover, in the coating machine 2 of this embodiment, shaping air for suppressing the spread of the spray paint is discharged from the rear outer side of the rotary atomizing head 11. More specifically, the housing 15 on the front end side of the coating machine 2 is provided with a plurality of discharge holes 16a and 16b for discharging shaping air. As shown in FIG. 2, the discharge holes 16 a and 16 b are formed on two concentric circles around the rotation shaft 12. The inner discharge hole (first discharge hole) 16a is a straight hole formed linearly along the axial direction, and the outer discharge hole (second discharge hole) 16b is inclined with respect to the axial direction. It is a torsion hole formed.

  As shown in FIG. 1, the housing 15 of the coating machine 2 is provided with two annular air supply chambers 17a and 17b, and a plurality of first discharge holes (first discharge hole group) 16a are provided on the inside air. The plurality of second discharge holes (second discharge hole group) 16b communicate with the supply chamber 17a and communicate with the outer air supply chamber 17b. The inner air supply chamber 17a is connected to the valve unit 5 via the first air supply path 18a, and the outer air supply chamber 17b is connected to the valve unit 5 via the second air supply path 18b. Yes.

  In the coating system 1 of the present embodiment, the valve unit 5 distributes and supplies the air from the air supply device 4 to the two air supply passages (the first air supply passage 18a and the second air supply passage 18b). The Then, shaping air having different discharge directions is discharged from the first discharge holes 16a and the second discharge holes 16b through the air supply passages 18a and 18b and the air supply chambers 17a and 17b. Further, by controlling the flow rate of the shaping air supplied to each air supply passage by the valve unit 5, painting is performed with an optimum painting pattern corresponding to the painting conditions.

  Hereinafter, a configuration for controlling the shaping air will be described in detail.

  The air supply device 4 includes an air supply source 21, an opening / closing valve 22, and an air regulator (air pressure reducing valve) 23, and is connected to the valve unit 5 via a main flow path 24. The air supply source 21 is composed of a compressor and supplies high-pressure air to the air regulator 23 via the opening / closing valve 22. The air regulator 23 adjusts the high-pressure air to a constant pressure and supplies it to the valve unit 5.

  The valve unit 5 includes an air control valve 26 and an actuator 27 attached to the air control valve 26. The valve unit 5 (air control valve 26 and actuator 27) in the present embodiment is fixed outside the case of the coating machine 2. In addition, when an installation space is securable inside the case of the coating machine 2, you may arrange | position the valve unit 5 in the case.

  As shown in FIG. 3, the air control valve 26 includes a first valve rotor 31 and a second valve rotor 32 as valve bodies, and a body 35 having valve body storage spaces 33 and 34 for storing them. .

  The body 35 of the air control valve 26 communicates with the valve body storage space 33 of the first valve rotor 31 and is connected to the main flow path 24, and the valve body storage space of the second valve rotor 32. 34, exhaust ports A and B connectable to the two air supply passages 18a and 18b are provided. In the body 35, a slit-like through hole 38 extending in the rotor axial direction is formed at a connection portion between the air supply port X and the valve body storage space 33. In addition, slit-like through holes 39 a and 39 b are also formed at the connection portions between the exhaust ports A and B and the valve body storage space 34.

  Each of the valve rotors 31 and 32 has a hollow cylindrical shape, and slots 41 and 42 having a predetermined shape for allowing air to pass therethrough are formed on the side walls thereof. A region where the slot 41 is formed in the first valve rotor 31 corresponds to the first valve portion, and a region where the slot 42 is formed in the second valve rotor 32 corresponds to the second valve portion. Moreover, an opening is provided on the tip end side of each valve rotor 31, 32, and these openings communicate with each other via an air passage 44 formed on the body 35 side. That is, in the air control valve 26, the air supplied from the air supply port X flows in the order of the first valve rotor 31 → the air passage 44 → the second valve rotor 32 and is discharged from the exhaust ports A and B. It has become.

  Further, rotary shafts 46 and 47 are fixed to the central portions of the base ends of the valve rotors 31 and 32, and the rotary shafts 46 and 47 are connected to a rotary shaft 49 of the actuator 27 via a gear 48. . The actuator 27 of the present embodiment is composed of a servo motor whose rotational position can be controlled, and is housed in an explosion-proof case 51. When the actuator 27 is driven, the valve rotors 31 and 32 are rotated (displaced) by a predetermined angle in accordance with the rotation of the rotating shaft 49.

  In the present embodiment, the flow path cross-sectional area is changed based on the rotational position of the first valve rotor 31, and the total flow rate of the shaping air is set. Further, the cross-sectional area of the flow path is changed based on the rotational position of the second valve rotor 32, and the ratio of the air distributed to the two supply air flow paths 18a and 18b is set.

  FIG. 4 is a valve development view showing a state in which the outer peripheral surface of each valve rotor 31 is developed in the rotation direction. In the figure, in addition to the slots 41 and 42 of the valve rotors 31 and 32, through holes 38, 39a and 39b on the body 35 side are also illustrated.

  As shown in FIG. 4A, the slot 41 of the first valve rotor 31 is formed so as to gradually increase in width along the rotor rotation direction. The cross-sectional area (flow path cross-sectional area) of the slot 41 connected to the through-hole 38 on the air supply port X side gradually changes according to the rotational position of the first valve rotor 31. And according to the cross-sectional area, the flow rate of shaping air can be set in the range of 0% to 100%.

  Further, as shown in FIG. 4B, the second valve rotor 32 has a slot (a slot provided on the left side in the drawing) 42a connected to the first exhaust port A and a slot connected to the second exhaust port B. (Slots provided on the right side in the figure) 42b. Then, according to the rotational position of the second valve rotor 32, the combination of the slots 42a and 42b connected to the through holes 39a and 39b on the exhaust port side is changed. In other words, the ratio of distributing air to the first exhaust port A and the second exhaust port B is set to one of 0: 100, 50:50, and 100: 0 according to the rotational position. It has become.

  In the present embodiment, when the actuator 27 is driven in response to the control signal of the control device 6, the valve rotor 32 rotates stepwise in the steps indicated by the numbers 1 to 7 in FIG. Accordingly, the pattern of shaping air is changed.

  Specifically, at the first rotational position, only the through hole 39a of the first exhaust port A is communicated with the hollow portion of the second valve rotor 32 through the slot 42a. Accordingly, air is supplied from the first exhaust port A of the exhaust ports A and B to the first air supply path 18 a, and shaping air is discharged from the straight hole 16 a formed in the housing 15.

  In the second rotational position, the through holes 39a and 39b of the first and second exhaust ports A and B are communicated with the hollow portion of the second valve rotor 32 through the slots 42a and 42b. Accordingly, air is supplied from both the first and second exhaust ports A and B to the first air supply path 18a and the second air supply path 18b, and from the straight hole 16a and the twisted hole 16b formed in the housing 15. Two types of shaping air having different discharge directions are discharged.

  In the third rotational position, only the through hole 39b of the second exhaust port B is communicated with the hollow portion of the second valve rotor 32 through the slot 42b. Accordingly, air is supplied from the second exhaust port B of the exhaust ports A and B to the second air supply path 18 b, and shaping air is discharged from the twisted hole 16 b formed in the housing 15.

  In the fourth rotational position, air is supplied from both the first and second exhaust ports A and B, and the injection direction is changed from the straight hole 16a and the twisted hole 16b of the housing 15 in the same manner as the second rotational position. Two different types of shaping air are discharged.

  At the fifth rotational position, air is supplied from the first exhaust port A of the exhaust ports A and B and the shaping air is discharged from the straight hole 16a of the housing 15 in the same manner as the first rotational position. .

  In the sixth rotational position, as in the second and fourth rotational positions, air is supplied from both the first and second exhaust ports A and B, and from the straight hole 16a and the twisted hole 16b of the housing 15. Two types of shaping air having different injection directions are discharged.

  In the seventh rotational position, air is supplied from the second exhaust port B of the exhaust ports A and B and the shaping air is discharged from the twisted hole 16b of the housing 15 in the same manner as the third rotational position. .

  In the valve unit 5 of the present embodiment, the first valve rotor 31 and the second valve rotor 32 rotate in conjunction with each other by the rotation of the common actuator 27. Therefore, when the second valve rotor 32 rotates stepwise from the first rotation position to the seventh rotation position, the first valve rotor 31 rotates in the same manner and is controlled by the first valve rotor 31. The total air flow rate gradually increases with the rotation.

  Further, the shaping air discharged from the straight hole 16a has a function of expanding the coating pattern to some extent and adjusting it into a uniform circle, and the shaping air discharged from the twisted hole 16b has a function of narrowing the coating pattern.

  Therefore, by controlling the rotational positions of the first and second valve rotors 31 and 32, the total flow rate of the shaping air is changed by the first valve rotor 31, and the shaping air is changed by the second valve rotor 32. The combination is changed. As a result, as shown in FIG. 5, different shaping air patterns can be set at each rotational position, and coating can be performed with different coating patterns. In FIG. 5, coating patterns P1 to P7 corresponding to the first to seventh rotation positions are shown in order from the left side.

  Thus, in the coating system 1 of this embodiment, it is possible to perform coating by switching the shaping air to a desired pattern according to the coating conditions such as the type of paint, the shape and distance of the object to be coated, and the like.

  Therefore, according to the present embodiment, the following effects can be obtained.

  (1) In the air control valve 26 of this embodiment, the flow rate of the shaping air can be accurately switched according to the coating pattern by a two-stage adjustment mechanism that changes the cross-sectional area of the air supply flow path. Further, by using the air control valve 26, the flow rate of the shaping air can be instantaneously stabilized, so that the coating efficiency and the coating quality of the coating machine 2 can be improved.

  (2) In the case of the present embodiment, the first valve rotor 31 and the second valve rotor 32 can be linked and driven by the common actuator 27, and the pattern change is performed more accurately and with high reproducibility. be able to. Moreover, since only one actuator 27 is required, a low-cost, compact, and lightweight coating system 1 can be realized.

  (3) In the case of the present embodiment, since the actuator 27 is a servo motor, the valve rotors 31 and 32 can be accurately rotated. Further, since the servo motor as the actuator 27 is housed in the explosion-proof case 51, the servo motor can be isolated from the environment outside the explosion-proof case 51. Therefore, it can be used as a suitable valve unit 5 in the coating system 1 using an organic solvent-based paint.

  In addition, you may change embodiment of this invention as follows.

  -In the said embodiment, the shape of the slots 41 and 42 formed in the 1st and 2nd valve rotors 31 and 32 can be changed suitably. FIG. 6 shows a valve development view of valve rotors 61 and 62 according to another embodiment. As shown in FIG. 6A, the slot 63 of the first valve rotor 61 is formed so that the width gradually decreases along the rotor rotation direction. Further, as shown in FIG. 6B, the second valve rotor 62 has a slot (a slot provided on the left side in the drawing) 64a connected to the first exhaust port A and a slot connected to the second exhaust port B. (Slots provided on the right side in the figure) 64b are provided one by one. The slot 64a connected to the first exhaust port A is formed so as to gradually increase in width along the rotor rotation direction, and the slot 64b connected to the second exhaust port B is gradually increased in width opposite to the slot 64a. Is formed to be narrow. Even if comprised in this way, according to the rotation position of the 1st valve rotor 61, the total flow volume of each shaping air can be set. Further, the ratio of air distributed to the two air supply passages can be set according to the rotational position of the second valve rotor 62.

  In the above embodiment, the first and second valve rotors 31 and 32 are rotated by the common actuator 27, but the present invention is not limited to this. As in another embodiment shown in FIG. 7, the first and second valve rotors V1 and V2 may be configured to be rotated by separate servo motors M1 and M2. In this case, the shaping air flowing through the air supply paths 18a and 18b via the first exhaust port A and the second exhaust port B can be set to an arbitrary flow rate, and coating is performed with a desired coating pattern. be able to. Note that the first valve motor 31 that sets the total air flow rate and the second valve motor 32 that sets the air distribution ratio may be housed in a common body as in the first embodiment, but separately. May be housed in the body. In other words, you may comprise so that the function as a 1st valve body and the function as a 2nd valve body may be borne by a separate valve.

  In the above embodiment, the flow rate of each shaping air is controlled using the two valve rotors 31 and 32, but the present invention is not limited to this. As in another embodiment shown in FIG. 8, the flow rate of each shaping air can be controlled by using one valve rotor 71. That is, the valve rotor 71 has one slot (slot provided on the left side in the figure) 72 connected to the first exhaust port A and two slots (slots provided on the right side in the figure) connected to the second exhaust port B. ) 73 and 74 are provided. The slot 72 on the exhaust port A side is formed so as to gradually increase in width from the upper side toward the lower side, and is formed so that the width below the one-dot chain line gradually decreases toward the lower side. Further, in this slot 72, the width below the one-dot chain line is narrower than the upper side. On the exhaust port B side, the slot 73 provided above the alternate long and short dash line is formed so that the width gradually decreases from above to below, and the slot 74 provided below the alternate long and short dash line extends from above to below. The width is gradually increased. With respect to the slots 73 and 74 on the exhaust port B side, the lower slot 74 is formed narrower than the upper slot 73.

  When the valve rotor 71 configured in this way is used, the flow rate of the shaping air can be set in two stages at the upper and lower rotational positions of the alternate long and short dash line. Furthermore, the shaping air can be distributed at an arbitrary ratio by changing the rotational position on the upper side and the lower side of the alternate long and short dash line. That is, it can be understood that the valve rotor 71 in FIG. 8 includes one valve body that functions as the first valve portion and the second valve portion.

  In the above embodiment, the actuator 27 for driving the valve rotors 31, 32, 61, 62, 71 may be a fluid pressure actuator such as an air cylinder or a hydraulic cylinder in addition to an electric actuator such as a servo motor. .

  The valve body of the air control valve 26 is not limited to the valve rotors 31, 32, 61, 62, 71 that are rotationally driven, and a valve body that reciprocates in the axial direction may be used. That is, any air control valve that can change the cross-sectional area of the air supply passage based on the displacement of the valve body may be used.

  In the coating system 1 described above, the air pressure at the air control valve 26 may be detected by a pressure sensor, and an abnormality in the valve operation may be detected based on the air pressure. Alternatively, the flow rate of air output from each of the exhaust ports A and B of the air control valve 26 may be detected by a flow meter, and an abnormality in the valve operation may be detected based on the flow rate of the air. Furthermore, you may comprise so that the rotational position of the valve rotors 31, 32, 61, 62, 71 may be controlled based on the detected value detected with the pressure sensor or the flow meter.

  In the coating system 1 described above, the motor of the coating material supply device 3 and the actuator 27 of the valve unit 5 may be integrally configured to reduce the size of the system.

  -Although the coating system 1 of the said embodiment discharged 2 types of shaping air from which a discharge direction differs, you may materialize to the system which discharges 3 or more types of shaping air.

  In the coating system 1 of the above embodiment, an organic solvent-based paint is used, but an aqueous paint that does not contain an organic solvent may be used. In the coating system 1 using the organic solvent-based paint, the actuator 27 needs to be stored in the explosion-proof case 51, but in the coating system using the water-based paint, the actuator 27 does not need to be stored in the explosion-proof case 51.

  In the above embodiment, the air control valve 26 is used in the rotary atomizing type coating machine 2, but it can also be used in an air atomizing gun, for example. In addition to the coating machine 2, an air control valve 26 can also be used to control the flow rate of shaping air that acts on the spray liquid such as a medicine in the liquid sprayer.

  Next, in addition to the technical ideas described in the claims, the technical ideas grasped by the embodiment described above are listed below.

  (1) The coating apparatus according to any one of claims 2 to 4, wherein the coating machine is a robot-mounted type, and the air control valve and the actuator are arranged in the robot-mounted type coating machine. system.

  (2) In Claim 1, the air supply flow path includes a first air supply path for supplying shaping air to a first discharge hole group including a plurality of first discharge holes, and the plurality of first discharge holes are air. A coating system comprising: a second air supply path for supplying shaping air to a second discharge hole group composed of a plurality of second discharge holes having different discharge directions.

  (3) Used in a liquid sprayer having a plurality of supply air passages for supplying shaping air acting on the spray liquid, and distributes air in a main passage connected to an air supply source to the plurality of supply air passages. An air control valve that can be supplied by a first valve portion and a second valve portion, and by changing the cross-sectional area of the flow passage based on the displacement of the first valve portion, the total flow rate of air from the main flow passage is An air control valve that can be set and can set a ratio of air distributed to the plurality of supply air flow paths by changing a flow path cross-sectional area based on displacement of the second valve portion.

  (4) Used in a coating machine having a plurality of air supply passages for supplying shaping air to suppress the spread of spray paint, and distributes the air in the main passage connected to the air supply source to the plurality of air supply passages. An air control valve that can be supplied, a body having a valve body housing space, an air supply port that is provided in the body, communicates with the valve body housing space, and is connectable to the main flow path; and A plurality of exhaust ports that communicate with the valve body housing space and can be connected to the plurality of air supply passages, respectively, and are displaceably housed in the valve body housing space, A valve body formed with two valve parts, and a total flow rate of air from the main flow path can be set by changing a flow passage cross-sectional area based on a displacement of the first valve part, and the second valve part By changing the channel cross-sectional area based on the displacement of Air control valve, wherein the ratio of the air can be set to dispense the inlet channel of the number system.

  (5) In the above (4), the valve body is a hollow cylindrical valve rotor having a predetermined pattern of slots formed on a side wall thereof and driven to rotate with respect to the body. The coating system is characterized in that the flow path cross-sectional area is changed accordingly.

  (6) In the above (5), the valve body is rotationally driven stepwise by the actuator, and the combination of the slots connected to the exhaust ports is changed based on the rotational position of the valve body. The painting system is characterized in that the pattern is changed.

  (7) Used in a coating machine having a plurality of air supply passages for supplying shaping air that suppresses the spread of spray paint, and distributes air in a main passage connected to an air supply source to the plurality of air supply passages. An air control valve provided on the upstream side of the location, wherein the total flow rate of air from the main flow path can be set by changing the flow path cross-sectional area based on the displacement of the valve portion.

  (8) Used in a coating machine having a plurality of air supply passages for supplying shaping air that suppresses the spread of spray paint, and distributes the air in the main passage connected to the air supply source to the plurality of air supply passages. An air control valve, characterized in that a ratio of air distributed to the plurality of supply air flow paths can be set by changing a flow path cross-sectional area based on a displacement of a valve portion.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic block diagram which shows the coating system of one Embodiment which actualized this invention. Explanatory drawing which shows the layout of the discharge hole of shaping air. Sectional drawing which shows a valve unit and an actuator. (A), (b) is a valve development view showing a valve rotor. Explanatory drawing which shows each coating pattern. (A), (b) is a valve development view showing a valve rotor of another embodiment. The block diagram which shows the coating system of another embodiment. The valve expanded view which shows the valve rotor of another embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Coating system 2 ... Coating machine 18a ... 1st air supply path | route as an air supply flow path 18b ... 2nd air supply path | route as an air supply flow path 21 ... Air supply source 24 ... Main flow path 26 ... Air control valve 27 ... Actuator 31 , 61... First valve rotor including the first valve portion 32, 62... Second valve rotor including the second valve portion 51. Explosion-proof case 71... Valve rotor including the first valve portion and the second valve portion

Claims (4)

Used in coating machines with multiple air supply channels that supply shaping air to suppress the spread of spray paint. The main flow air connected to the air supply source can be distributed and supplied to the multiple air supply channels. Air control valve,
A body having a valve body accommodating space;
An air supply port provided in the body, communicated with the valve body accommodating space via a first slit-shaped through hole, and connectable to the main flow path;
A plurality of exhaust ports provided in the body, communicated with the valve body accommodating space via a second slit-like through hole, and connectable to the plurality of air supply passages;
A hollow cylindrical valve rotor as a valve body accommodated so as to be rotationally driven in the valve body accommodating space;
A first valve portion formed on a side wall of the valve rotor, including a region having a first slot in which air can pass from the first slit-like through-hole side and whose width changes in the rotor rotation direction;
A second valve portion formed on a side wall of the valve rotor, including a region having a second slot through which air can pass from the second slit-like through-hole side and whose width changes in the rotor rotation direction;
Wherein the by changing the flow path cross-sectional area based on the rotational position of the first valve part, the air of the total flow rate from the main channel can be set, the flow path cross-sectional area based on the rotational position of the second valve portion The air control valve is characterized in that the ratio of the air distributed to the plurality of supply air flow paths can be set by changing the above. A coating machine having a plurality of air supply passages for supplying shaping air to suppress the spread of spray paint;
An air control valve according to claim 1;
An actuator attached to the air control valve for driving the first valve portion and the second valve portion of the air control valve, and driving the first valve portion and the second valve portion by the actuator By this, the coating system is capable of changing the shaping air pattern.   The coating system according to claim 2, wherein the first valve unit and the second valve unit are driven by a common actuator.   The coating system according to claim 2 or 3, wherein the actuator is a control motor housed in an explosion-proof case.

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