JP4823784B2 - Fluid pressure regulator and painting equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluid pressure and a painting apparatus which can circulate a paint in a non-operating state and also try certainly to highly improve an efficiency by energy saving for lessening an energy loss. <P>SOLUTION: The painting apparatus 1 has a liquid supplying passage 2 and a liquid returning passage 3 for circulating the paint, a plurality of fluid pressure regulators 4 which are connected to the liquid supplying passage 2 and operated by a compressed air, a painting gun 5 which is connected to the fluid pressure regulator 4 and also the liquid returning passage 3, and an air supplying passage 11 for supplying the compressed air to the fluid pressure regulator 4. The fluid pressure regulator 4 is formed so that a valve rod 28 moves independently in a diaphragm 23 by the energization force of an energization spring 74 for pistons to maintain a valve 49 opened in the waiting state that the compressed air is not supplied to a cylinder room 61. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

  The present invention relates to a hydraulic pressure regulator and a coating apparatus, and more particularly, to a hydraulic pressure regulator and a coating apparatus suitable for painting a paint.

  2. Description of the Related Art Conventionally, a hydraulic regulator that can discharge a liquid pressurized using a diaphragm to a constant pressure is known. Such a fluid pressure regulator, for example, in a painting line for painting on a vehicle panel, reduces the pressure of the paint supplied as a liquid to a predetermined pressure so as to be a predetermined flow rate and supplies it to the painting gun. It is used for.

  Such painting of vehicle panels requires a large number of paint colors, and each paint must always be painted in the same color tone. In addition, one color is painted independently on the painting line, for example, on the top, right and left sides of the vehicle panel, but the same color and quality are supplied to each painting gun. There is a need to. Therefore, in order to always supply the same quality paint to a plurality of painting guns (removal ports), the painting guns used in the painting line are connected to each other by piping.

  There are various types of paints, and among them, there are paints in which particulate substances called metallic, mica, pearl and the like are mixed. Such paints in which particulate substances are mixed often settle or separate when the paint gun is stopped for a long period of time, that is, in the pipe, It is necessary to circulate through the pipe at a constant speed.

  In recent years, water-based paints have been promoted to reduce environmental burden. Since this water-based paint generally has a higher viscosity than a solvent-based paint, it requires a large amount of energy required for circulation and must be sent out at a high pressure.

  By the way, in the painting equipment used for the painting line which paints a vehicle panel, there is a thing with the total number of painting guns exceeding several hundred to a thousand, and the total extension of the paint circulation piping may exceed 1 km. Since many pipes are connected and used, a large amount of energy is required to keep the paint circulated by applying pressure in these pipes.

  FIG. 6 shows an example of a painting apparatus used in a painting line for painting a conventional vehicle panel. A conventional painting apparatus 101 includes a liquid supply pipe 102 and a liquid as a liquid supply path for circulating paint. A liquid return pipe 103 as a return path, a plurality of hydraulic pressure regulators 104 (only three are shown in FIG. 6) connected to the liquid supply pipe 102, and a liquid return line connected to each of these hydraulic pressure regulators 104. It has a coating gun 105 (only three are shown in FIG. 6) connected to the pipe 103.

  The paint stored in the paint tank 107 by the pump 106 is pressurized and supplied at a predetermined pressure to the base end portion of the liquid supply pipe 102 through the filter 108, and passes through the liquid supply pipe 102. The paint is returned to the paint tank 107 via a back pressure valve 109 disposed at the tip of the liquid supply pipe 102. The paint introduced from each paint gun 105 into the liquid return pipe 103 is returned to the paint tank 107 via the back pressure valve 110 provided at the tip of the liquid return pipe 103. The filter 108 is mainly used for removing foreign substances contained in the paint.

  The hydraulic pressure regulator 104 is pressurized by opening and closing the valve by detecting the pressure (discharge pressure) on the secondary side of the liquid using a regulating spring or a diaphragm whose operating pressure is adjusted by compressed air supplied from the outside. A liquid that can control the flow rate at which the liquid is discharged by reducing the pressure of the liquid to a constant pressure is used (see, for example, Patent Document 1).

  The hydraulic pressure regulator 104 and the coating gun 105 are connected by a connecting pipe 111 to ensure a paint flow path between them. Of course, the coating gun 105 is disposed freely.

Japanese Patent Laid-Open No. 10-184945

  However, the conventional coating apparatus 101 has a problem that it cannot meet the recent demand for higher performance.

  That is, in the conventional coating apparatus 101, since the paint circulation amount at which the best painting is obtained at the time of performing the painting work is strictly set, the paint must be circulated under the same conditions even when the painting work is not performed. In other words, the energy required for the circulation of the paint cannot be reduced.

  When the hydraulic pressure regulator 104 is operated by compressed air supplied from the outside, the hydraulic pressure regulator 104 is controlled by supplying compressed air to each hydraulic pressure regulator 104 via an air supply path (not shown). The paint can be set to circulate, but for that purpose, it is necessary to continue to supply compressed air to the air supply path even when the factory is not in operation, resulting in a large energy loss. is there.

  Accordingly, there is a need for a hydraulic pressure regulator and a coating apparatus that can circulate paint in a non-operating state and can reliably achieve high performance by energy saving to reduce energy loss.

  The present invention has been made in view of this point, and a hydraulic regulator and coating that can circulate the paint in a non-operating state and can reliably achieve high performance by energy saving to reduce energy loss. An object is to provide an apparatus.

  In order to achieve the above object, the hydraulic regulator according to claim 1 of the present invention is characterized in that a main body provided with an opening and an attachment to the main body so as to cover the opening of the main body. A bonnet that is sandwiched between the main body and the bonnet, a cylinder chamber that is provided on the bonnet side of the diaphragm and is supplied with compressed air for controlling the operating pressure of the diaphragm, and the diaphragm A diaphragm chamber provided on the main body side through which liquid can pass; a valve provided at a liquid inflow portion into the diaphragm chamber; and a valve rod for opening and closing the valve. In the hydraulic pressure regulator configured to control the flow rate of the liquid by detecting the pressure on the secondary side with the diaphragm and opening and closing the valve, The Linda chamber is provided with a piston capable of moving forward and backward toward the diaphragm, and a piston biasing spring for biasing the piston toward the diaphragm. The piston has a base of the valve stem. In a standby state where the end portion is attached and compressed air is not supplied to the cylinder chamber, the valve rod moves independently of the diaphragm by the biasing force of the piston biasing spring, and It is in the point formed so that a valve may be kept open. And by employ | adopting such a structure, a valve | bulb can be hold | maintained in an open state in a standby state.

  The hydraulic regulator according to claim 2 of the present invention is characterized in that, in claim 1, the support body capable of supporting the central portion of the diaphragm from the diaphragm chamber side is provided on the valve rod. In the pressure regulation state in which compressed air is supplied to the cylinder chamber and the pressure on the secondary side of the liquid passing through the diaphragm chamber is detected by the diaphragm to control the flow rate of the liquid, the support body Is in contact with the diaphragm, and the valve rod is formed to open and close the valve in conjunction with the displacement of the diaphragm. By adopting such a configuration, the liquid can be discharged under reduced pressure so as to have a predetermined flow rate in the pressure regulation state.

  Further, the coating apparatus according to the third aspect of the present invention is characterized in that a liquid supply path and a liquid return path for circulating paint and a compressed air connected to the liquid supply path are operated. A plurality of hydraulic pressure regulators, a coating gun connected to each of these hydraulic pressure regulators and connected to the liquid return path, and an air supply path for supplying compressed air to each of the plurality of hydraulic pressure regulators In the coating apparatus having the above, the hydraulic pressure regulator is the hydraulic pressure regulator according to claim 1 or 2. And by employ | adopting such a structure, a coating material can be circulated without supplying compressed air to an air supply path in the non-operation state which does not perform a painting operation.

  According to the hydraulic pressure regulator of the present invention, in a standby state where compressed air is not supplied to the cylinder chamber, the valve rod moves independently of the diaphragm by the biasing force of the piston biasing spring to open the valve. Since it is formed so as to be held in a state, it has an excellent effect of allowing the liquid to flow in the standby state.

  Further, according to the coating apparatus according to the present invention, the valve can be kept open in a standby state where the compressed air is not supplied to the hydraulic pressure regulator, so that the compressed air is supplied to the hydraulic pressure regulator in the non-operating state. It has excellent effects such as being able to circulate the paint without having to do so.

  Therefore, according to the hydraulic pressure regulator and the coating apparatus of the present invention, it is possible to circulate the paint in a non-operating state, and it is possible to reliably achieve high performance by energy saving to reduce energy loss. There is an effect.

  The present invention will be described below with reference to embodiments shown in the drawings.

  FIG. 1 is a schematic diagram showing the main part of the overall configuration of an embodiment of a coating apparatus according to the present invention.

  The coating apparatus according to the present embodiment exemplifies an apparatus capable of performing coating such as metallic paint on a vehicle panel such as an automobile with a coating gun.

  As shown in FIG. 1, the coating apparatus 1 according to the present embodiment includes a liquid supply pipe 2 as a liquid supply path for circulating a liquid paint, a liquid return pipe 3 as a liquid return path, and a liquid supply pipe 2. A plurality of connected hydraulic pressure regulators 4 (only three are shown in FIG. 1), and coating guns 5 (three in FIG. 1) connected to each of these hydraulic pressure regulators 4 and connected to the liquid return pipe 3 Only shown).

  At the base end of the liquid supply pipe 2, the paint stored in the paint tank 7 by the pump 6 is pressurized and supplied at a predetermined pressure through the filter 8, and passes through the liquid supply pipe 2. The applied paint is returned to the paint tank 7 through a back pressure valve 9 disposed at the tip of the liquid supply pipe 2. The paint introduced from each paint gun 5 into the liquid return pipe 3 is returned to the paint tank 7 through a back pressure valve 10 disposed at the tip of the liquid return pipe 3. The filter 8 is mainly used for removing foreign substances contained in the paint.

  As will be described later, the hydraulic pressure regulator 4 detects the secondary pressure (discharge pressure) by a diaphragm 23 whose operating pressure is adjusted by compressed air supplied from the outside, and opens and closes the valve. What can control the flow volume which a coating material discharges by reducing the supplied coating material to a fixed pressure is used. Therefore, each hydraulic pressure regulator 4 is connected to an air supply pipe 11 as an air supply path for supplying compressed air, which is a control pressure for adjusting the operating pressure of the diaphragm 23.

  An air compressor is connected to the base end of the air supply pipe 11 through an air tank and an aftercooler (not shown) in this order. The compressed air supplied from the air supply pipe 11 to the hydraulic pressure regulator 4 is adjusted to a predetermined pressure (control pressure) via an air cleaner and an air pressure adjusting unit (not shown) and supplied to each hydraulic pressure regulator 4. It has become so.

  Further, the hydraulic regulator 4 and the coating gun 5 are connected by a connecting pipe 12 to ensure a paint flow path between them. Of course, the coating gun 5 is arranged to move freely.

  About another structure, since it is the same as that of the conventional coating apparatus 1, the detailed description is abbreviate | omitted.

  Here, the hydraulic pressure regulator 4 used in the coating apparatus 1 of the present embodiment will be described in detail.

  2 and 3 show the main part of an embodiment of the hydraulic regulator according to the present invention, FIG. 2 is a front view, and FIG. 3 is a longitudinal sectional view taken along the line AA of FIG.

  As shown in FIGS. 2 and 3, the hydraulic regulator 4 of the present embodiment has a rubber between a main body 21 (FIG. 3) formed in a substantially circular plane and a bonnet 22 (FIGS. 2 and 3). A diaphragm 23 (FIG. 3) formed in a substantially annular shape made of an elastic body, a metal plate, and a resin plate alone or in combination is sandwiched.

  As shown in FIG. 3, a pair of upper and lower plates 24 and 25 are disposed at the center of the diaphragm 23 so as to sandwich the inner peripheral edge side of the diaphragm 23. One of the pair of upper and lower plates 24 and 25 shown below the diaphragm 23 in FIG. 3 is the lower plate 24 positioned on the main body side, and the other shown above the diaphragm 23 in FIG. 3 is on the bonnet side. The upper plate 25 is positioned.

  The lower plate 24 is formed in a stepped cylindrical shape as a whole by a large diameter portion 26 located on the main body side and a small diameter portion 27 located on the bonnet side. The outer diameter of the large-diameter portion 26 is formed larger than the inner hole size of the diaphragm 23 so that the outer peripheral edge of the large-diameter portion 26 is located at a substantially central portion in the radial direction of the diaphragm 23, for example. Further, the outer size of the small diameter portion 27 is slightly smaller than the inner hole size of the diaphragm 23 so that the inner hole of the diaphragm 23 is fitted radially outward. Furthermore, the axial length shown in the vertical direction of FIG. 3 of the small diameter portion 27 is formed to be larger than the thickness of the upper plate 25 shown in the vertical direction of FIG. A male screw 27a is formed. Furthermore, the central portion of the lower surface of the lower plate 24 is a concave smooth contact surface 26a.

  An intermediate portion of a valve rod 28 used for opening and closing a valve, which will be described later, is inserted into the inner hole of the lower plate 24 so as to be movable in the vertical direction. A first sealing device 29 is disposed in the inner hole of the lower plate 24. As the first sealing device 29, for example, various reciprocating motion seals such as O-ring, X-ring, slipper seal, and lip packing represented by U-packing can be used alone or in combination. . Further, the inner hole of the upper plate 25 may be a stuffing box and cup packing or gland packing may be used alone or in combination.

  The upper plate 25 is formed in an annular shape, and its inner hole size is substantially the same as the inner hole size of the diaphragm 23, that is, slightly larger than the outer diameter size of the small diameter portion 27 of the lower plate 24. .

  In the lower plate 24 and the upper plate 25, the small diameter portion 27 of the lower plate 24 is inserted into the inner hole of the diaphragm 23 from below, and the inner hole of the upper plate 25 is inserted in the outer periphery of the small diameter portion 27. Then, the lock nut 30 is screwed into the male screw 27a of the small diameter portion 27 and screwed thereto so that the inner peripheral edge portion of the diaphragm 23 is sandwiched between the upper surface of the large diameter portion 26 and the lower surface of the lower plate 24 from above and below. Is attached.

  The main body 21 supports the outer peripheral edge portion of the diaphragm 23 from below and forms a diaphragm chamber 31 on the lower surface side that is one surface side of the diaphragm 23, that is, on the main body side of the diaphragm 23. Is formed by integrally forming a base portion 32 formed in a bottomed cylindrical shape having an open top as a whole and a cylindrical mounting portion 33 formed at the center of the lower surface of the base portion 32. ing. A lower flange portion 34 is formed on the upper portion of the base portion 32. The lower flange portion 34 is formed in a substantially annular shape so as to support the outer peripheral edge of the diaphragm 23 from below. The lower flange portion 34 is formed larger than the outer diameter of the diaphragm 23, and the upper surface shown above is a lower support surface 35 that can support the diaphragm 23 from below. Furthermore, a plurality of, in the present embodiment, six through-holes 36 (only part of which are shown) are formed on the outer side in the radial direction from the outer peripheral edge of the diaphragm 23 of the lower flange portion 34 in this embodiment. ing. These through-holes 36 are arranged concentrically at equal distances from the axis of the base portion 32 with equal distances between adjacent ones.

  Between the lower support surface 35 and the diaphragm 23, a second sealing device 37 made of a gasket such as an O-ring for preventing leakage of paint as a liquid supplied into the diaphragm chamber 31 is disposed. Yes.

  A substantially bottomed bottom hole 38 having a substantially circular shape in which an upper opening for forming the diaphragm chamber 31 is formed is formed at a substantially central portion of the base portion 32. The lower bottomed hole 38 is formed smaller than the outer peripheral edge of the diaphragm 23 and larger than the outer diameter of the lower plate 24.

  A communication hole 39 that penetrates the inside of the bottomed bottom hole 38 and the inside of the attachment portion 33 in the vertical direction is formed in the shaft center part of the bottom of the bottomed hole 38. Further, a concave groove 41 connected to the communication hole 39 is formed at the bottom of the lower bottomed hole 38 so as to be orthogonal to the axial direction. A plurality of the concave grooves 41 may be provided. An annular valve seat 40 is disposed at the lower end of the communication hole 39, that is, at the center of the bottom of the mounting portion 33.

  The valve seat 40 is sandwiched and positioned from above and below by the bottom of the mounting portion 33 and the upper end of a joint 42 formed in a cylindrical shape as a whole screwed into the inner hole of the mounting portion 33. A third sealing device 43 for preventing leakage of the paint supplied to the diaphragm chamber 31 is disposed on the outer peripheral side of the valve seat 40. For example, a gasket such as an O-ring is used as the third sealing device 43.

  The inner hole of the joint 42 is a supply-side flow path 44 used for supplying the paint to the diaphragm chamber 31. The inner hole has a valve accommodating portion 45, a spring accommodating portion 46, from the top to the bottom. A small-diameter annular portion 47 and a paint supply portion 48 are formed in this order. The valve housing portion 45, the spring housing portion 46, the small-diameter annular portion 47, and the paint supply portion 48 are each formed in a cylindrical shape, and are formed with their respective axes being coaxial. In addition, as the coating material supply part 48, it is good also as a shape which bent the axis center at right angles or 45 degree | times in the middle like an elbow.

  The valve accommodating portion 45 accommodates a ball body 49 as a valve body that can be brought into and out of contact with the valve seat 40, and a compression coil formed in a conical shape inside the spring accommodating portion 46. A valve biasing spring 50 made of a spring is accommodated with its large diameter side downward. The lower end portion of the valve biasing spring 50 is supported from below by being in contact with the connecting step portion with the small-diameter annular portion 47 serving as the bottom of the spring accommodating portion 46, and the upper end of the valve biasing spring 50 is The ball body 49 is in contact with the valve seat 40 and is in contact with the lower portion of the ball body 49.

  That is, the ball body 49 is supported from below so as to contact the valve seat 40 with the biasing force of the valve biasing spring 50, and when the ball body 49 is in contact with the valve seat 40, Can be blocked from flowing into the diaphragm chamber 31 through the through hole 36.

  In addition, as a shape of the urging spring 50 for a valve, the coil shape which makes a general cylindrical shape may be sufficient.

  Therefore, in the inner hole of the joint 42 as the supply-side flow path 44, a ball body 49 as a valve body that can contact and separate from the valve seat 40 for controlling the flow of liquid passing through the diaphragm chamber 31, this valve A valve biasing spring 50 that biases the ball body 49 as a body toward the valve seat 40 is provided. That is, a valve is disposed at the inflow portion of the paint into the diaphragm chamber 31.

  The opening end located at the lower end of the paint supply unit 48, that is, the central part of the lower end of the joint 42 is a supply port 51 for the paint supplied by pressure from the outside. 1 liquid supply pipe 2 (FIG. 1) is connected.

  One end of a discharge side flow path 52 is connected to the outer peripheral portion of the diaphragm chamber 31, and the other end of the discharge side flow path 52 is connected to a discharge port 53 formed on the outer periphery of the base portion 32. Yes. Then, the connection port 12 (FIG. 1) of the coating apparatus 1 is connected to the discharge port 53. Depending on the configuration of the coating gun 105, the coating gun 105 can be directly connected to the discharge port 53, as referred to as a gun mount regulator. One end of a measurement channel (not shown) is connected to the outer peripheral portion of the diaphragm chamber 31, and the other end of the measurement channel is a gauge port for pressure measurement formed on the outer periphery of the base portion 32. (FIG. 2). Note that the measurement channel and the gauge port may be provided according to the design concept or the like.

  The bonnet 22 is attached to the main body 21 so as to cover the opening of the main body 21. The bonnet 22 is formed in a substantially cylindrical shape with an opening at the bottom and a small bottom at the top, and a cylinder chamber 61 is formed on the hood side of the diaphragm 23. In addition, an upper flange portion 62 formed in a substantially annular shape in a plane for supporting the outer peripheral edge of the diaphragm 23 from above is provided at the lower portion of the bonnet 22. Similar to the lower flange portion 34 of the main body 21, the upper flange portion 62 is formed larger than the outer diameter of the diaphragm 23, and its lower surface is an upper support surface 63 that can support the diaphragm 23 from above.

  A plurality of screw holes 64 penetrating in the plate thickness direction are formed on the outer side in the radial direction from the outer peripheral edge of the diaphragm 23 of the upper flange portion 62 in the present embodiment. Similar to the through hole 36 of the lower flange portion 34, these screw holes 64 are arranged concentrically at equal distances from the axial center of the bonnet 22 with equal distances between adjacent ones. Then, the bonnet 22 is attached to the main body 21 by screwing the fixing screws 65 inserted from below into the through holes 36 of the lower flange portion 34 of the main body 21 into the respective screw holes 64 of the upper flange portion 62. In addition, the diaphragm 23 can be sandwiched between the main body 21 and the bonnet 22. At this time, the bonnet 22 is disposed so that the opening of the bonnet 22 faces the opening of the main body 21. The diaphragm 23 is provided with six through holes 66 through which the fixing screws 65 are inserted.

  The cylinder chamber 61 of the present embodiment is formed with a first upper bottomed hole 67 having a diameter larger than the outer diameter of the upper plate 25 capable of accommodating the upper plate 25 therein. A second upper bottomed hole 68 having a diameter larger than the outer diameter of the lock nut 30 capable of accommodating the lock nut 30 therein and smaller than the outer diameter of the upper plate 25 is formed at the bottom of the bottom hole 67. Is formed. Further, a third upper bottomed hole 69 having a smaller diameter than the second upper bottomed hole 68 functioning as a cylinder tube having a smaller diameter than the outer diameter of the lock nut 30 is formed at the bottom of the second upper bottomed hole 68. A fourth upper bottomed hole 70 having a diameter smaller than that of the third upper bottomed hole 69 is formed at the bottom of the third upper bottomed hole 69, and is formed at the center of the bottom of the fourth upper bottomed hole 70. Is formed with a small-diameter through hole 71 communicating with the outside.

  In the third upper bottomed hole 69, a piston 72 is slidable in the vertical direction so that the piston 72 can move forward and backward toward the diaphragm 23. A piston packing 73 is provided on the outer peripheral surface of the piston 72. It is arranged. The piston 72 is attached with an upper end portion as a base end portion of the valve rod 28, and the piston 72 and the valve rod 28 are integrally formed.

  A piston biasing spring 74 is disposed in the fourth upper bottomed hole 70. The biasing force of the piston biasing spring 74 is formed larger than the biasing force of the valve biasing spring 50.

  The valve rod 28 is disposed so as to pass through the central portion of the diaphragm 23 and the diaphragm chamber 31 so that the tip end portion thereof contacts and separates from the top of a ball body 49 as a valve body.

  Here, the biasing force of the piston biasing spring 74 is set to a value larger than the sum of the biasing force of the valve biasing spring 50 and the force acting to press the ball body 49 against the valve seat 40 through the supply-side flow path 44. This is important for maintaining the open (fully open) state of the valve in which the ball body 49 is separated from the valve seat 40 in the standby state in which compressed air is not supplied to the cylinder chamber 61.

  The maximum downward movement position of the valve stem 28 is a disk-like support body 75 provided so as to be in contact with and away from the contact surface 26a of the lower plate 24 in a portion of the valve stem 28 located in the diaphragm chamber 31. The lower surface of the diaphragm is regulated by contacting the bottom of the diaphragm chamber 31. Further, the upper surface of the support 75 can be brought into contact with the contact surface 26a of the lower plate 24 while the valve rod 28 is moving upward, so that the lower plate 24 and thus the central portion of the diaphragm 23 can be moved upward. It is formed as follows. Further, the maximum upward movement position of the valve stem 28 is regulated by bringing the outer peripheral side portion of the upper surface of the upper plate 25 into contact with the bottom surface of the first upper bottomed hole 67.

  In addition, as a shape of the cylinder chamber 61, you may form in a column shape, and it is not limited to the shape of this embodiment in particular.

  Compressed air for controlling the operating pressure of the diaphragm 23 is supplied to the cylinder chamber 61 between the piston 72 of the cylinder chamber 61 and the diaphragm 23, in the present embodiment, at the bottom of the first upper bottomed hole 67. The lower end, which is one end of the control pressure supply path 76, is connected. The upper end, which is the other end of the control pressure supply path 76, is connected to an air inlet 77 formed on the upper surface of the bonnet 22. The air inlet 77 is connected to an air supply pipe 11 (FIG. 1) as an air supply path for supplying the compressed air of the coating apparatus 1.

  The control pressure supply passage 76 may be any as long as it can supply compressed air between the cylinder chamber 61, more specifically, the piston 72 disposed in the cylinder chamber 61 and the diaphragm 23. The shape and the like can be variously changed according to the design concept and the like.

  Next, the operation of the present embodiment having the above-described configuration will be described.

  As shown in FIG. 3, in a standby state in which compressed air is not supplied to the cylinder chamber 61 of the hydraulic pressure regulator 4 of the present embodiment (no compressed air in the cylinder chamber 61), the piston biasing spring 74 is attached. The piston 72 is moved downward toward the diaphragm 23 by the force, and the downward movement of the piston 72 causes the valve rod 28 to move downward independently of the diaphragm 23. The ball member 49 is moved downward against the urging force of the valve urging spring 50 to keep the ball member 49 spaced from the valve seat 40 in an open state.

  At this time, the upper surface of the support body 75 of the valve rod 28 is spaced below the contact surface 26 a of the lower plate 24, and the lower surface of the support body 75 contacts the bottom of the diaphragm chamber 31 and The maximum downward movement position is regulated.

  At this time, since the valve is held in the open state, the paint supplied to the communication hole 39 passes through the concave groove 41 even when the lower surface of the support 75 is in contact with the bottom of the diaphragm chamber 31. Flow into the diaphragm chamber 31. Further, since the valve rod 28 is inserted through the inner hole of the lower plate 24 so as to be movable in the vertical direction, it moves independently of the diaphragm 23. The diaphragm 23 is in a horizontal state shown in the left-right direction in FIG. Holding.

  That is, according to the hydraulic regulator 4 of the present embodiment, the valve is kept open in a standby state in which compressed air is not supplied to the cylinder chamber 61.

  Next, when compressed air is supplied from the outside to the cylinder chamber 61 of the hydraulic regulator 4 of the present embodiment and the pressure in the cylinder chamber 61 exceeds a preset value, the biasing force of the piston biasing spring 74 is resisted. As a result, the valve rod 28 rises together with the piston 72, the upper surface of the support 75 of the valve rod 28 contacts the contact surface 26 a of the lower plate 24, and the valve rod 28 operates integrally with the diaphragm 23.

  Next, when the pressure of the compressed air supplied to the cylinder chamber 61, that is, the pressure of the cylinder chamber 61 reaches a preset control pressure, a force that pushes the diaphragm 23 by the control pressure of the compressed air is applied to the diaphragm chamber 31. The force of pushing the diaphragm 23 by the pressure-supplied paint is balanced.

  At this time, unlike the conventional case, the pressure of the compressed air supplied to the cylinder chamber 61 due to the presence of the piston 72 and the piston biasing spring 74 for operating the valve rod 28 causes a force to push the diaphragm 23 downward, It is used in a distributed manner with both the force that pushes up the piston 72 against the biasing force of the piston biasing spring 74. As a result, since the effective area on the control side that controls the operation of the diaphragm 23 is reduced by the presence of the piston 72, the pressure of the paint passing through the diaphragm chamber 31 is less than the control pressure by the compressed air supplied to the cylinder chamber 61. The force that pushes the diaphragm 23 from above and below at a low value keeps the balance.

  Therefore, in the hydraulic pressure regulator 4 of the present embodiment, the pressure in the cylinder chamber 61 reaches the control pressure, and the fluctuation of the pressure on the discharge outlet 53 side of the liquid passing through the diaphragm chamber 31 is detected by the diaphragm 23 to detect the flow rate of the paint. In the pressure regulation state for controlling the pressure, the support body 75 keeps the state where it abuts against the abutting surface 26 a of the lower plate 24, and thus the diaphragm 23, and the valve stem 28 operates integrally with the diaphragm 23. become.

  In the pressure regulation state, the diaphragm 23 is substantially horizontal, the tip of the valve rod 28 is separated from the ball body 49, and the ball body 49 abuts on the valve seat 40 by the biasing force of the valve biasing spring 50. Is closed. As a result, the hydraulic regulator 4 enters a shut-off state in which the flow of the paint is shut off by a valve provided in the supply-side flow path 44 disposed in front of the diaphragm chamber 31 as an inflow portion of the paint into the diaphragm chamber 31. . FIG. 4 shows a cut-off state of the pressure regulation state of the hydraulic pressure regulator 4.

  Next, when the pressure (hydraulic pressure) of the paint acting on the diaphragm 23 becomes lower than the control pressure in the pressure regulation state of the hydraulic pressure regulator 4, the diaphragm 23 and the valve stem 28 move downward due to the control pressure, and the valve stem 28. The tip which is the lower end of the ball member 49 pushes down the ball body 49 against the biasing force of the valve biasing spring 50. As a result, the ball body 49 is separated from the valve seat 40 and the valve is opened. As a result, the fluid pressure regulator 4 enters a fluid state in which the coating material as a liquid passes through the diaphragm chamber 31 and is discharged from the discharge port 53. FIG. 5 shows a flow state in the pressure regulation state of the hydraulic pressure regulator 4.

  Further, when the hydraulic pressure acting on the diaphragm 23 becomes higher than the control pressure in the pressure regulation state of the hydraulic pressure regulator 4, the diaphragm 23 and the valve rod 28 are moved upward by the hydraulic pressure, and the ball body 49 is moved from the valve seat 40. Since the valve is opened after being separated, the hydraulic pressure regulator 4 is in a cut-off state in which the flow of the paint is cut off by the valve.

  As described above, the hydraulic pressure regulator 4 according to the present embodiment operates the diaphragm 23 in accordance with the discharge pressure of the paint, which is the pressure on the secondary side, and repeats the shut-off state and the flow state in the pressure regulation state. The paint supplied by being pumped from the liquid supply pipe 2 (FIG. 1) is reduced to a predetermined pressure so as to have a predetermined flow rate, and is supplied from the discharge port 53 to the coating gun 5 via the connection pipe 12 (FIG. 1). can do.

  That is, in the pressure regulation state, the ball body 49 can be brought into contact with and separated from the valve seat 40 in conjunction with the displacement of the diaphragm 23, that is, the valve can be opened and closed reliably and easily.

  In the hydraulic pressure regulator 4 of the present embodiment, when the pressure in the cylinder chamber 61 decreases, the hydraulic pressure of the paint discharged from the discharge port 53 decreases as the pressure decreases. When the pressure applied to the piston 72 and the urging force of the piston urging spring 74 are balanced due to the decrease in the control pressure, the force for pushing the diaphragm 23 downward does not act, and the valve is closed. When the pressure further decreases, the urging force of the piston urging spring 74 moves the valve rod 28 together with the piston 72 downward, that is, in the direction of separating the ball body 49 from the valve seat 40, independently of the diaphragm 23. When compressed air is extracted from the cylinder chamber 61, the hydraulic regulator 4 is opened by the biasing force of the piston biasing spring 74, and returns to the standby state shown in FIG.

  As described above, according to the hydraulic pressure regulator 4 of the present embodiment, in the standby state where the compressed air is not supplied to the cylinder chamber 61, the valve rod 28 is separated from the diaphragm 23 by the biasing force of the piston biasing spring 74. Since the ball body 49 is independently moved away from the valve seat 40 to keep the valve open, compressed air for controlling the operating pressure of the diaphragm 23 is supplied to the cylinder chamber 61. It is easy and reliable to keep the valve open when it is lost.

  Therefore, according to the hydraulic pressure regulator 4 of the present embodiment, the valve rod 28 is independent of the diaphragm 23 by the urging force of the piston urging spring 74 in the standby state where the compressed air is not supplied to the cylinder chamber 61. Therefore, it is possible to easily and reliably cause the paint to flow in the standby state.

  Further, according to the hydraulic pressure regulator 4 of the present embodiment, the support body 75 is brought into contact with the contact surface 26a of the lower plate, and thus the diaphragm 23, in a pressure regulation state in which compressed air is supplied to the cylinder chamber 61. Since the valve stem 28 is formed so as to open and close the valve in conjunction with the displacement of the diaphragm 23, the pressure of the paint discharged from the discharge port 53 can be easily and reliably adjusted in the pressure-controlled state.

  Moreover, according to the hydraulic pressure regulator 4 of the present embodiment, the valve is kept open in the standby state, that is, the valve does not open and close in the standby state, so that the progress of wear of the valve can be prevented.

  According to the coating apparatus 1 of the present embodiment, since the hydraulic pressure regulator 4 holds the valve open in the standby state, the hydraulic pressure regulator 4 and thus the air in the non-operating state in which painting work is not performed such as a holiday. The paint can be circulated without supplying compressed air to the air supply pipe 11 as the supply path, that is, without driving the air compressor.

  Further, according to the coating apparatus 1 of the present embodiment, since the hydraulic pressure regulator 4 holds the valve in the standby state, the flow resistance by the hydraulic pressure regulator 4 when the paint is circulated is reduced. Therefore, even if the pressure of the pump 6 is lowered in the non-operating state, the circulating flow rate necessary for maintaining the homogeneity of the paint can be obtained easily and reliably. Therefore, according to the coating apparatus 1 of the present embodiment, it is easy to change the conditions for circulating the paints in the operating state and the non-operating state so that energy consumption in the non-operating state can be reduced. it can.

  Moreover, according to the coating apparatus 1 of this embodiment, since the hydraulic pressure regulator 4 holds the valve in the standby state, a minute gap is not formed in the valve. As a result, even when the paint is mixed with particulate matter, even if the paint is circulated in the non-operating state, the particulate matter mixed in the paint is destroyed or It is possible to reduce the peeling of the resin covering the surface. Therefore, the coating quality of the paint can be kept high.

  In addition, according to the coating apparatus 1 of the present embodiment, compression that has been impossible in the past is performed by a simple method of replacing the pneumatically operated hydraulic pressure regulator of the existing coating apparatus with the hydraulic pressure regulator 4 of the present embodiment. The circulation of the paint in the non-operating state can be easily realized without supplying air.

  Therefore, according to the hydraulic pressure regulator 4 and the coating apparatus 1 of the present embodiment, it is possible to circulate the paint in a non-operating state, and it is possible to reliably achieve high performance by energy saving to reduce energy loss.

  In addition, the hydraulic pressure regulator of this invention can be used for the pressure regulation of not only a coating material but various liquids.

  Moreover, the coating apparatus of this invention can be used for the coating of not only a vehicle panel but various products.

  The present invention is not limited to the above-described embodiments, and various modifications can be made as necessary.

The systematic diagram which shows the principal part of the whole structure of embodiment of the coating device which concerns on this invention The front view which shows the principal part in the standby state of embodiment of the hydraulic regulator which concerns on this invention Sectional view along AA in FIG. The figure similar to FIG. 3 which shows the principal part in the interruption | blocking state among the pressure regulation states of the hydraulic pressure regulator of FIG. The same figure as FIG. 3 which shows the principal part in the flow state among the pressure regulation states of the hydraulic pressure regulator of FIG. System diagram showing the main parts of an example of a conventional coating device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Coating apparatus 2 Liquid supply piping 3 Liquid return piping 4 Fluid pressure regulator 5 Coating gun 6 Pump 7 Paint tank 11 Air supply piping 12 Connection piping 21 Main body 22 Bonnet 23 Diaphragm 28 Valve rod 31 Diaphragm chamber 40 Valve seat 44 Supply side flow path 49 Ball body 50 Valve biasing spring 52 Discharge-side flow path 61 Cylinder chamber 72 Piston 74 Piston biasing spring 75 Support body 76 Control pressure supply path

Claims (3)

A main body provided with an opening; a bonnet attached to the main body so as to cover the opening of the main body; a diaphragm sandwiched between the main body and the bonnet; and the diaphragm provided on the bonnet side of the diaphragm A cylinder chamber that is supplied with compressed air for controlling the operating pressure of the diaphragm, a diaphragm chamber that is provided on the main body side of the diaphragm and through which a liquid can pass, and a valve that is provided at the inflow portion of the liquid into the diaphragm chamber And a valve stem for opening and closing the valve,
In the hydraulic pressure regulator configured to control the flow rate of the liquid by detecting the pressure on the secondary side of the liquid with the diaphragm and opening and closing the valve,
The cylinder chamber is provided with a piston that can be advanced and retracted toward the diaphragm, and a piston biasing spring that biases the piston toward the diaphragm. The base end is attached,
In a standby state in which compressed air is not supplied to the cylinder chamber, the valve rod is moved independently of the diaphragm by the biasing force of the piston biasing spring to hold the valve in the open state. A hydraulic regulator characterized by being formed.   The valve stem is provided with a support body capable of supporting the central portion of the diaphragm from the diaphragm chamber side, and the pressure on the secondary side of the liquid passing through the diaphragm chamber when compressed air is supplied to the cylinder chamber In a pressure regulation state in which the flow rate of the liquid is controlled by detecting the diaphragm, the support is brought into contact with the diaphragm and the valve rod is configured to open and close the valve in conjunction with the displacement of the diaphragm. The hydraulic regulator according to claim 1, wherein the hydraulic regulator is provided. A liquid supply path and a liquid return path for circulating paint, a plurality of hydraulic pressure regulators connected to the liquid supply path and operated by compressed air, and connected to each of these hydraulic pressure regulators and the liquid return path In a coating apparatus having a coating gun connected to a path and an air supply path for supplying compressed air to each of the plurality of hydraulic pressure regulators,
The coating apparatus according to claim 1, wherein the hydraulic pressure regulator is the hydraulic pressure regulator according to claim 1.

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