JP4230471B2 - Liquid applicator for press - Google Patents

Description

  The present invention relates to a press liquid coating apparatus, and in particular, sprays a coating liquid for pressing, such as release oil, onto the surface of the plate under the action of static electricity on the surface of the plate conveyed in a short time during press molding. In addition, the present invention relates to an electrostatic press liquid coating apparatus for uniform coating instantaneously.

  Referring to FIGS. 5 and 6A and 6B, when the plate 103 such as an iron plate, an aluminum plate, or other metal plate is conventionally press-formed by the press machine 101, the surface of the plate 103 is used. A press coating liquid (hereinafter referred to as “pressing liquid” or “liquid”) such as a lubricating oil or a release oil is applied to the film to perform press working. For example, the body of an automobile is formed by press-molding a large plate 103 having a length of 3000 mm and a width of 2000 mm by a press machine 101. In recent years, an aluminum plate is often used instead of an iron plate. Since the surface of this aluminum plate is likely to be rough during molding as compared with an iron plate, the application state of the press liquid is an important processing condition in press molding.

  The plate 103 is sent out after being positioned by a destacker 105 (plate unloader) as shown in FIG. Subsequently, it is carried in to the press machine 101 by the conveyor apparatus 107 as a board | plate material carrying-in apparatus, for example. In the middle of the conveyor device 107, an electrostatic press liquid applicator 109 is provided, and the press liquid is directed from the nozzle 111 of the press liquid applicator 109 toward the upper and lower surfaces of the plate material under the action of static electricity. Sprayed and applied evenly instantaneously. The nozzle 111 is a blade type nozzle.

  In the conveyor device 107, as shown in FIG. 6A, two conveyors 107A and 107B are arranged at the front and back via a space S, and the press liquid application device 109 is disposed at the space. Above and below S, an upper nozzle 111U that sprays the pressing liquid toward the upper surface of the plate member 103 and a lower nozzle 111L that sprays the pressing liquid toward the lower surface of the plate member 103 are provided. Accordingly, when the plate material 103 passes through the interval S of the conveyor device 107, the pressing liquid is sprayed and applied to the upper and lower surfaces of the plate material 103 by the lower nozzles 111U and 111L.

  Referring to FIGS. 6A and 6B, in the conventional electrostatic press liquid coating apparatus 109, the mechanisms for spraying the press liquid from the upper and lower nozzles 111U and 111L are the same. Therefore, the upper nozzle 111U will be described, and the same members constituting each mechanism are denoted by the same reference numerals, and detailed description of the lower nozzle 111L is omitted.

  The press liquid application apparatus 109 includes an upper nozzle 111U having a plurality of press liquid discharge flow channel groups 113 to be discharged toward the plate member 103, and the discharge liquid flow channel groups 113 corresponding to the plurality of discharge flow channel groups 113, respectively. A plurality of first liquid supply lines 115 communicating to supply liquid, a manifold 117 communicating to branch supply of the liquid to the plurality of first liquid supply lines 115, and the plurality of first liquid supplies A plurality of first electromagnetic valves 119 interposed in the first liquid supply pipelines 115 to open and close the pipelines 115; a second liquid supply pipeline 121 communicating to supply the liquid to the manifold 117; Coating is performed from a liquid discharge pipe 123 communicating with the manifold 117 to discharge the liquid in the manifold 117, and a second electromagnetic valve 125 interposed to open and close the liquid discharge pipe 123. Hydraulic circuit is constituted.

  Further, in the coating hydraulic circuit described above, the press liquid is supplied from the liquid tank 131 to the manifold 117 via the second liquid supply conduit 121 by the liquid pump 129 that is rotationally driven by the liquid motor 127 and the liquid. The discharge pipe 123 is connected to the liquid tank 131 so that the liquid in the manifold 117 circulates back to the liquid tank 131.

  Referring also to FIG. 7, in the conventional electrostatic press liquid coating apparatus 109, a large number of shims 137 are used as electrodes in a slit 135 formed between a pair of nozzle blades 133A and 133B. An arranged nozzle head 139 is provided. The nozzle blades 133 </ b> A and 133 </ b> B are made of an electrically insulating material, and are provided with a total length that is greater than the length of the plate member 103 of 3000 mm. The shim 137 is made of a conductive material made of a stainless steel sheet having a thickness of about 0.5 mm, for example, and has a length of about 100 to 150 mm. Accordingly, a large number of shims 137 are arranged in the horizontal direction, and are arranged so that the total length thereof is the same as the total length of the nozzle blades 133A, 133B.

  Further, between the surface of the shim 137 and the adjacent surface of the nozzle blade 133 </ b> A, a discharge channel group 113 of liquid to be discharged toward the plate member 103 is formed. For example, the discharge flow path group 113 is etched at a groove depth C on one surface of a shim 137. Note that a liquid supply port 141 for supplying liquid is communicated with the discharge flow path group 113.

  Referring to FIGS. 8A, 8B, and 8C together, for example, as shim 137, oil reservoirs 143A and 143B and discharge flow path groups 113A and 113B are disposed on the left surface in FIG. 8B. Are etched at a depth C of about 0.25 mm, for example, and a liquid supply port 141 for supplying liquid to the oil sumps 143A and 143B connected to the discharge flow path groups 113A and 113B is communicated.

  The oil sumps 143A and 143B communicate with a pair of liquid supply ports 141 in the nozzle blade 133A of the coating apparatus 101. These liquid supply ports 141 are connected to the first liquid supply conduit 115 and the first electromagnetic wave as shown in FIG. The valve 119 is connected to the liquid pump 129 via the manifold 117 and the second liquid supply pipe 121.

  The discharge flow path groups 113A and 113B act as capillary resistances, the resistance value is proportional to the length of the flow path, and the flow rate is inversely proportional to the square of the length. The application widths of the fluid discharged from the discharge flow path groups 113A and 113B are WA and WB, respectively. Therefore, by opening and closing the first electromagnetic valve 119 upstream of each of the discharge flow path groups 113A and 113B, the entire application width of the shim 137 is changed to WA, WB, and WA + WB according to the object 103 to be applied. It is possible.

  The relatively large circular openings 145 formed on both sides of the sumps 143A and 143B in the shim 137 are for passing fixing bolts to the support bracket and the like of the entire coating apparatus. In addition, the relatively small circular opening 147 disposed in the area adjacent to the sumps 143A and 143B provides a set screw for assembling the apparatus while maintaining liquid tightness between the shim 137 and the adjacent nozzle blade 133. To pass.

  The final discharge port 149 of the discharge flow channel groups 113A and 113B formed as described above has a quadrangular shape as shown in FIG. .75 mm × depth 0.25 mm, and the pitch of the discharge ports 149 of the discharge flow path groups 113A and 113B is 3.0 mm.

  Referring to FIG. 7 again, the plate member 103 is grounded and has a positive potential. Therefore, when a negative high potential DC high voltage (around −60 to −70 kV) is applied to the shim 137 via the power connector 151, the liquid supplied from the liquid supply port 141 flows through the discharge flow path groups 113A and 113B. Since they are charged instantaneously while passing, charges of the same polarity repel each other. As a result, the liquid is atomized as fine particles having a uniform particle diameter and sprayed evenly from the tip of the nozzle head 139 toward the plate member 103. The diffusion width A of the liquid on the plate material 103 is spread evenly according to the amount of liquid ejected.

The liquid motor 127 and the first electromagnetic valve 119 are each controlled by a control device 153 (see, for example, Patent Document 1).
JP 2002-79144 A

  By the way, in the conventional electrostatic press liquid coating apparatus 109, when the plate material 103 is conveyed by the conveyor device 107 at a speed of, for example, 30 m / min or more, the plate material 103 sets the interval S between the conveyor devices 107 to 1 to 1. It will pass in 2 seconds. Therefore, the press liquid sprayed from the upper and lower nozzles 111U and 111L needs to be applied to the upper and lower surfaces of the plate material 103 within a short time of 1 to 2 seconds.

  However, in the conventional press liquid coating apparatus 109, for example, the upper nozzle 111U will be described. As shown in FIG. 6A, the manifold 117 and the plurality of first electromagnetic valves 119 are disposed above the upper nozzle 111U. Since the liquid in the first liquid supply conduit 115 between each first solenoid valve 119 and the upper nozzle 111U is gravity, the discharge flow passage groups 113A and 113B are subjected to their own weight due to gravity. become. On the other hand, when the liquid flows through the discharge flow path groups 113A and 113B, a resistance force that resists the liquid self-weight is generated between the discharge flow path group wall surface and the viscosity of the liquid.

  Therefore, in order to prevent the liquid in the first liquid supply pipe 115 from leaking naturally from the final discharge ports 149 of the discharge flow path groups 113A and 113B due to the above self-weight pressure, The cross-sectional area of the orthogonal discharge port 149 is narrowly adjusted so that the resistance force generated by the discharge channel group wall surface and the viscosity of the liquid is greater than the self-weight. Further, in order to allow the liquid to flow evenly to the discharge ports 149 of the discharge flow path groups 113A and 113B, a back pressure against the liquid is generated by generating a resistance force at the discharge ports 149. Incidentally, the conventional discharge port 149 has a channel width of 0.75 mm × depth of 0.25 mm.

  More specifically, in order to apply the pressing liquid to the surface of the plate member 103 within a short time of 1 to 2 seconds, it is desirable that the liquid is discharged from the discharge port 149 with almost no resistance. However, since resistance is generated for the above reason, the discharge time of the liquid sprayed from each discharge port 149 is delayed by several m to several tens msec, and the liquid spray follows the conveying speed of the plate material 103. There was a problem of not doing. On the contrary, if there is no resistance by each discharge port 149, as described above, the liquid in each first liquid supply conduit 115 naturally leaks from each discharge port 149 due to its own weight. Will occur.

  In the lower nozzle 111L, a phenomenon opposite to that of the upper nozzle 111U occurs, and negative pressure is applied to each of the discharge flow path groups 113A and 113B due to the negative weight on the negative side due to the liquid in the first liquid supply pipe 115. It will take. Therefore, in this case as well, there is a problem that the discharge time of the liquid sprayed from each discharge port 149 is delayed, and the liquid spray does not follow the transport speed of the coated object 103.

  Accordingly, in the conventional electrostatic press liquid application apparatus 109, it is very difficult to apply the press liquid to the surface of the plate 103 in a short time of 1 to 2 seconds. It is necessary to slow down the conveying speed of 107, or to calculate the delay of the above-mentioned liquid discharge time in advance and open the first electromagnetic valve 119 early, or to take other measures, so the coating efficiency is reduced. However, there was a problem that the mechanism was complicated.

  Further, in the conventional hydraulic circuit for application, when the liquid to be applied is sprayed from the discharge ports 149 of the plurality of discharge flow path groups 113 of the nozzle 111 toward the surface of the plate member 103, the manifold 117. The plurality of first electromagnetic valves 119 communicating with each other are simultaneously opened, and the second electromagnetic valve 125 is closed at the same time, so that the liquid in the manifold 117 and each first liquid supply pipe 115 is discharged to each discharge port 149. Sprayed from.

  On the other hand, when the liquid is not sprayed from the nozzle 111, the plurality of first electromagnetic valves 119 are simultaneously closed, and the second electromagnetic valve 125 is opened at the same time. The liquid spraying stops, and the liquid in the manifold 117 returns to the liquid tank 131 through the liquid discharge conduit 123.

  However, when the first electromagnetic valve 119 and the second electromagnetic valve 125 are simultaneously opened and closed, a state in which both the first and second electromagnetic valves 119 and 125 are simultaneously opened may occur momentarily. . Then, since the liquid in the manifold 117 is discharged through the liquid discharge line 123 and the inside of the manifold 117 becomes negative pressure, the liquid in each of the plurality of first liquid supply lines 115 moves to the manifold 117 side. There has been a problem that the discharge time of the liquid sprayed from each discharge port 149 is delayed due to backflow.

  The present invention has been made to solve the above-described problems.

The press liquid application apparatus according to the first aspect of the present invention includes a plurality of press liquid discharge flow path groups to be discharged toward a plate material, and supplies the liquid to the lower nozzle and the discharge flow path group. A first liquid supply path communicating as much as possible, and a first open / close valve interposed to open and close the first liquid supply path, and the first open / close valve is a discharge flow path group of the upper and lower nozzles. Are arranged at almost the same height level as
A manifold communicating with the plurality of first liquid supply paths to branch and supply the liquid; a second liquid supply path communicating with the manifold for supplying the liquid; and discharging the liquid in the manifold to the manifold. The upper liquid discharge path, the second open / close valve provided to open and close the lower liquid discharge path, and the liquid interposed in the lower liquid discharge path on the downstream side of the second open / close valve. A storage chamber,
Press from the lower liquid discharge path to the liquid storage chamber from the height of the liquid supply port to be supplied to each discharge flow path group of the upper and lower nozzles from the first liquid supply path and the downstream side of the second on-off valves. The height of the liquid discharge path for discharging the liquid for use is arranged at substantially the same level ,
The liquid storage chamber is provided in a storage chamber main body, a main body is provided in an upper portion of the storage chamber main body, a liquid discharge pipe line of a second opening / closing valve is connected in the main body, and the liquid storage chamber Is connected to a breather hole communicating with the outside air at a position above the connecting portion connected to the liquid discharge pipe .

  As can be understood from the means for solving the above problems, according to the first aspect of the present invention, when the first on-off valve and the first liquid supply path are arranged at the same level. Since the self-weight pressure of the liquid in the first liquid supply path is hardly applied to the discharge flow path group, the liquid does not naturally leak out from the discharge flow path group unless the first on-off valve is opened. .

  The heights of the first on-off valve and the first liquid supply path can be changed upward or downward within a certain range depending on the viscosity of the liquid to be applied. For example, when the viscosity of the liquid to be applied is high, the self-pressure of the liquid is slightly increased in the direction toward the discharge flow path group by disposing the first open / close valve and the first liquid supply path upward. On the other hand, when the viscosity of the liquid to be applied is low, by placing the first opening / closing valve and the first liquid supply path below, the liquid self-weight pressure slightly decreases in the direction opposite to the discharge flow path group side. In this way, the liquid in the liquid supply path can be sprayed more smoothly from the discharge flow path group following the transport speed of the coated body.

  Therefore, for example, the pressing liquid can be evenly applied to the surface of the plate material conveyed at a speed of 30 m / min or more in a short time of 1 to 2 seconds.

Further, in order to operate the liquid to be sprayed toward the surface of the plate member from the plurality of the discharge flow path group Roh nozzle, when the opening and closing operations of the first and second on-off valve is switched, first and second Even if the open state of the two open / close valves occurs instantaneously at the same time, the liquid in the liquid discharge path is once discharged into the liquid storage chamber and the airtight state is divided, so that the manifold does not become negative pressure. As a result, since the liquid in each of the plurality of first liquid supply paths flows back to the manifold side, the conventional problem that the discharge time of the liquid sprayed from each discharge flow path group thereafter is delayed. The situation as a point can be prevented.

  Embodiments of the present invention will be described below with reference to the drawings.

  As explained in FIG. 6 of the background art, when a plate material such as an iron plate, an aluminum plate, or other metal plate material is press-molded by a press machine, the surface of the plate material is preliminarily made of lubricating oil, mold release oil, etc. A pressing liquid is applied.

  The plate material is sent out after being positioned by a destacker (plate unloader). Subsequently, it is carried in to a press machine by the conveyor apparatus as a board | plate material carrying-in apparatus, for example.

  Referring to FIGS. 1A and 1B, an electrostatic press liquid applicator 3 is provided in the middle of the conveyor device 1, and the surface of the plate 5 is coated with press liquid. The pressing liquid is sprayed from the nozzle 7 of the apparatus 3 toward the upper and lower surfaces of the plate member 5 under the action of static electricity, and applied instantaneously and uniformly.

  In the conveyor device 1, for example, two conveyors 1 </ b> A and 1 </ b> B are arranged in front and rear with a gap S therebetween. An upper nozzle 7U that sprays the pressing liquid toward the bottom and a lower nozzle 7L that sprays the pressing liquid toward the lower surface of the plate member 5 are provided. Accordingly, when the plate material 5 passes through the interval S of the conveyor device 1, the press liquid is applied on the upper and lower surfaces of the plate material 5 by the lower nozzles 7U and 7L.

  In this electrostatic type press liquid applicator 3, since the mechanisms for spraying the press liquid from the upper and lower nozzles 7U and 7L are the same as described above, the upper nozzle 7U will be described. The same members constituting the same reference numerals are denoted by the same reference numerals, and detailed description of the lower nozzle 7L is omitted.

  The press liquid applicator 3 corresponds to the upper nozzle 7U having a plurality of press liquid discharge flow channel groups 9 to be discharged toward the plate material 5 and each of the plurality of discharge flow channel groups 9. A plurality of first liquid supply pipes 11 that communicate with each other to supply the liquid, a manifold 13 that communicates with the plurality of first liquid supply pipes 11 to branch and supply the liquid, and the plurality of first liquids. For example, a first electromagnetic valve 15 serving as a plurality of first opening / closing valves provided in each first liquid supply pipe 11 to open / close the supply pipe 11 and a first valve connected to supply the liquid to the manifold 13. 2 liquid supply line 17, a liquid discharge line 19A communicating with the manifold 13 to discharge the liquid in the manifold 13, and a second opening / closing valve interposed to open and close the liquid discharge line 19A For example, the second solenoid valve 1, a liquid storage chamber 23 provided in the liquid discharge pipe 19 </ b> A on the downstream side of the second electromagnetic valve 21, and a liquid discharge pipe 19 </ b> B communicating with the downstream side of the liquid storage chamber 23. A pressure circuit is configured.

  Further, in the coating hydraulic circuit described above, the press liquid is supplied from the liquid tank 29 to the manifold 13 via the second liquid supply conduit 17 by the liquid pump 27 that is rotationally driven by the liquid motor 25 and the liquid. The discharge pipe 19 </ b> B communicates with the liquid tank 29 so that the liquid in the manifold 13 circulates back to the liquid tank 29.

  Further, each of the plurality of first electromagnetic valves 15 is disposed at substantially the same height level as the upper nozzle 7U. That is, when the heights of the plurality of first solenoid valves 15 and the upper nozzle 7U are at the same level, the plurality of first solenoid valves 15 and the first liquids as shown in FIG. The supply pipeline 11 is basically located at the height of point a. The plurality of first electromagnetic valves 15 and the first liquid supply pipes 11 may be arranged at an upper b point or a lower c point within a certain range with respect to the a point.

  Referring also to FIG. 2, in the electrostatic press liquid coating apparatus 3 according to the embodiment of the present invention, the upper nozzle 7 </ b> U is disposed between the pair of nozzle blades 31 and the nozzle blade 33. A nozzle head 39 in which a large number of shims 37 are arranged as electrodes in the formed slit 35 is provided. The nozzle blades 31 and 33 are made of an electrically insulating material such as insulating plastic, for example, and are provided with a total length longer than the length of the plate 5 of 3000 mm as shown in FIG. The shim 37 is made of a conductive material made of a stainless steel sheet having a thickness of about 0.7 mm, for example, and has a length of about 100 to 150 mm as shown in FIG. Therefore, in FIG. 1B, a large number of shims 37 are arranged in the horizontal direction and arranged so that the total length thereof is the same as the total length of the nozzle blades 31 and 33.

  The nozzle head 39 is provided with a connector pin 43 that constitutes, for example, a power connector 41 as an electrode for applying a negative high voltage to the shim 37 so as to protrude from the side surface of the nozzle blade 31 or 33.

  Further, between the surface of the shim 37 and the adjacent surface of the nozzle blade 31, a liquid discharge channel group 9 to be discharged toward the plate member 5 is formed. For example, the discharge flow path group 9 is etched at a groove depth C on one side of the shim 37 (in this embodiment, the left side of the shim 37 in FIG. 2). Note that a liquid supply port 45 for supplying liquid is communicated with the discharge flow path group 9.

  3 (A), (B), and (C) are also referred to. For example, as the shim 37, oil reservoirs 47A and 47B and discharge flow path groups 9A and 9B are disposed on the left surface in FIG. Are etched at a depth C, and the discharge flow channel groups 9A and 9B extend from the oil sumps 47A and 47B, and have a flow channel groove directed downstream. . The intervals between the flow paths positioned at the most downstream ends correspond to the liquid application widths WA and WB, and the application widths WA and WB can be set to, for example, about 50 mm.

  The oil reservoirs 47A and 47B communicate with a pair of liquid supply ports 45 in the nozzle blade 31 of the coating apparatus, and these liquid supply ports 45 are liquids via the first electromagnetic valve 15 and the manifold 13 as shown in FIG. Connected to the pump 27. Incidentally, in the press liquid application apparatus 3 of FIG. 1B, a liquid supply port 45 is provided in the nozzle blade 31 corresponding to each of a large number of shims 37, and each liquid supply port 45 has a first one. One liquid supply conduit 11 communicates.

  The discharge flow path groups 9A and 9B act as capillary resistances, the resistance value is proportional to the length of the flow path, and the flow rate is inversely proportional to the square of the length. The application widths of the fluid discharged from the discharge flow path groups 9A and 9B are WA and WB, respectively. Therefore, by opening and closing the first solenoid valve 15 on the upstream side of each of the discharge flow path groups 9A and 9B, the entire coating width of the shim 37 can be changed to WA, WB, and WA + WB according to the plate material 5. Is possible.

  The relatively large circular openings 49 formed on both sides of the sumps 47A and 47B in the shim 37 are for passing fixing bolts to the support bracket and the like of the entire coating apparatus. A relatively small circular opening 51 disposed in the area adjacent to the sumps 47A and 47B is a stop for assembling the apparatus while maintaining the liquid tightness between the shim 37 and the adjacent nozzle blades 31 and 33. A screw is passed through.

  Further, in this embodiment, one flow channel is arranged in each of the coating widths WA and WB as the discharge flow channel groups 9A and 9B, and the discharge flow channel groups 9A and 9B formed as described above. As shown in FIG. 3C, the discharge port 53 of the final flow channel has a quadrangular shape, and when the liquid flows through the discharge flow channel groups 9A and 9B, the discharge flow channel is formed. The structure is expanded to minimize the resistance generated by the group wall surface and the viscosity of the liquid. Compared with the conventional discharge port, it is greatly expanded, and as an example of each discharge port 53 of this embodiment, there is not a large number of flow channels but a single flow channel. 48.0 mm × depth 0.5 mm, and the pitch of the discharge ports 53 of the discharge flow path groups 9A and 9B is 50.0 mm.

  Further, the thick portion 55 at the boundary between the discharge flow path groups 9A and 9B is provided with a protrusion 57 that protrudes about 0.6 mm downward from each discharge port 53 in FIG. The protrusion 57 is ejected from the discharge port 53 of the discharge flow path group 9A when the discharge flow path group 9A is used and the discharge flow path group 9B is not used, for example, in accordance with the width of the plate material 5 to be applied. This is to improve the liquid leakage of the liquid to be used.

  4A and 4B, the liquid storage chamber 23 (duffer device) is provided in, for example, a block-shaped storage chamber main body 59, and a main body 60 is provided above the storage chamber main body 59. The liquid discharge pipe 19 </ b> A on the downstream side of the second electromagnetic valve 21 provided in the main body 60 is connected to the upper portion of the liquid storage chamber 23, and is positioned above the connection portion and is located in the liquid storage chamber 23. A breathing hole 61 (brid air hole) is provided to communicate the upper part of the air and the outside air. In addition, a liquid discharge pipe 19 </ b> B communicates with the lower part of the liquid storage chamber 23 at the lower part of the storage chamber main body 59, and the liquid discharge pipe 19 </ b> B communicates with the liquid tank 29. The storage chamber body 59 is attached to the press liquid applicator 3 via a plate-like bracket 63 with a fixing tool such as a bolt. The main body 60 is fixed to the storage chamber main body 59 with screws 64A and 64B. By loosening the screws 64A and 64B, the position of the main body 60 can be adjusted up and down with respect to the storage chamber main body 59. This liquid storage chamber 23 is used to cut off the pressure of the liquid discharge pipe 19A and the liquid discharge pipe 19B (not affected by the pressure). In other words, the pressure in the liquid discharge pipe 19 </ b> A is made zero by the liquid storage chamber 23.

  Further, the height of the end portion of the liquid discharge conduit 19A is substantially the same as the height of the liquid supply port 45 that supplies the discharge passage groups 9A and 9B of the nozzle 7 from the first liquid supply conduits 11 described above. Are arranged at a certain level.

  In order to easily explain this point, for example, an imaginary height reference line HSL is set as shown in FIG. 1A, and the liquid supply port 45 of the upper nozzle 7U is set from this height reference line HSL. Let L1 be the height to point P1. On the other hand, as shown in FIG. 1B, the point P2 at the end of the liquid discharge conduit 19A downstream of the second electromagnetic valve 21 communicating from the height reference line HSL to the manifold 13 of the upper nozzle 7U. If the height up to L2 is L2, it is arranged so that L1≈L2.

  The reason is that if L1> L2, the amount of the press liquid ejected from each discharge flow path group 9A, 9B of the nozzle 7 decreases, while if L1 <L2, the nozzle Thus, the amount of the press liquid ejected from each of the seven discharge flow path groups 9A and 9B increases. In other words, when the amount of liquid for pressing supplied by the liquid pump 27 is 100, the entire amount of 100 may be ejected from each of the discharge flow path groups 9A and 9B. It becomes.

  However, if it is set to satisfy L1≈L2 as described above, it is possible to secure the injection amount of the pressing liquid having a fixed width from the discharge flow path groups 9A and 9B of the nozzle 7.

  The lower nozzle 7L is the same as that of the upper nozzle 7U. That is, as shown in FIG. 1A, the height from the height reference line HSL to the point P3 of the liquid supply port 45 of the lower nozzle 7L is L3. On the other hand, as shown in FIG. 1B, the point P4 at the end of the liquid discharge conduit 19A downstream of the second solenoid valve 21 communicating from the height reference line HSL to the manifold 13 of the lower nozzle 7L. If the height up to L4 is L4, it is arranged so that L3≈L4.

  Referring to FIG. 2 again, the second liquid supply line 17 between the liquid pump 27 and the manifold 13 has a relief for keeping the fluid pressure of the second liquid supply line 17 and the fluid pump 27 constant. A valve 65 is interposed.

  The liquid motor 25 and the first electromagnetic valve 15 are each controlled by a control device 67.

  Next, the operation of the above configuration will be described.

  Referring to FIGS. 1A and 1B, the liquid to be applied is supplied from the liquid tank 29 to the manifold 13 via the second liquid supply conduit 17 by the liquid pump 27 driven to rotate by the liquid motor 25. . When the liquid is sprayed from the manifold 13 toward the surface of the plate member 5 from the discharge ports 53 of the final flow paths of the plurality of discharge flow path groups 9A and 9B of the upper nozzle 7U, the manifold 13 The plurality of first electromagnetic valves 15 communicating with each other are simultaneously opened, and at the same time, the second electromagnetic valve 21 is closed. Thereby, the liquid in the manifold 13 and the first liquid supply pipes 11 is sprayed from the discharge ports 53 via the discharge flow path groups 9A and 9B.

  On the other hand, when the liquid is not sprayed from the upper nozzle 7U, the plurality of first electromagnetic valves 15 are simultaneously closed and the second electromagnetic valve 21 is opened at the same time, whereby each discharge port 53 of the upper nozzle 7U. From which the liquid in the manifold 13 returns to the liquid tank 29 through the liquid discharge pipe 19A, the liquid storage chamber 23, and the liquid discharge pipe 19B.

  Furthermore, referring to FIG. 2, the operation when the liquid is sprayed from the upper nozzle 7U will be described in detail. The plate member 5 is grounded and has a positive potential. Therefore, when a negative DC high voltage (around −60 to −70 V) is applied to the shim 37 via the power connector 41, the control device 67 turns on the first electromagnetic valve 15 and the second electromagnetic valve 21. The liquid is supplied to the liquid supply port 45 through the first liquid supply pipe 11 and the liquid supplied from the liquid supply port 45 passes through the discharge flow path groups 9A and 9B of the shim 37. Since they are charged instantly, charges of the same polarity repel each other. As a result, the liquid is atomized as fine particles having a uniform particle diameter and sprayed uniformly from the tip of the nozzle head 39 toward the plate member 5. The diffusion width A of the liquid on the plate member 5 is spread evenly according to the amount of liquid sprayed.

  On the other hand, when the first electromagnetic valve 15 is turned OFF and the second electromagnetic valve 21 is turned ON by the control device 67, the liquid spray from the tip of the nozzle head 39 is stopped. The liquid in the manifold 13 is discharged through the liquid discharge pipes 19A and 19B. At this time, as described above, the liquid supplied to the manifold 13 from the liquid tank 29 via the second liquid supply conduit 17 by the liquid pump 27 passes through the second electromagnetic valve 21 and the liquid discharge conduit 19A, and then the liquid storage chamber 23. To flow. At this time, since the liquid storage chamber 23 communicates with the outside air through the breathing hole 61, the liquid in the liquid discharge conduit 19A flows from the end of the liquid discharge conduit 19A into the liquid storage chamber 23 and is temporarily stored. Thereafter, the liquid is again discharged to return to the liquid tank 29 through the liquid discharge pipe 19B.

  From the above, as shown in FIG. 1A, each of the plurality of first electromagnetic valves 15 and each of the first liquid supply conduits 11 is disposed at the position of point a having the same height level. At that time, since the self-weight pressure of the liquid in each first liquid supply pipe 11 is hardly applied to each discharge port 53 of each discharge flow path group 9A, 9B, each first electromagnetic valve 15 must be opened. As a result, the liquid does not naturally leak from the discharge port 53.

  The height of each of the plurality of first electromagnetic valves 15 and each of the first liquid supply pipes 11 is preferably changed to the upper b point or the lower c point depending on the viscosity of the liquid to be applied as described above. .

  For example, when the viscosity of the liquid to be applied is high, the plurality of first electromagnetic valves 15 and the first liquid supply pipes 11 are arranged at the upper point b, so that the self-weight pressure of the liquid is reduced to the discharge ports 53. The liquid in each first liquid supply conduit 11 can be sprayed more smoothly by following the conveying speed of the plate material 5 from each discharge port 53 so that it slightly increases in the direction toward the + (plus) side. . On the other hand, when the viscosity of the liquid to be applied is low, the plurality of first electromagnetic valves 15 and the first liquid supply pipes 11 are arranged at the lower point c, so that the self-weight pressure of the liquid is reduced to the discharge ports 53. The liquid in each first liquid supply pipe 11 is sprayed more smoothly by following the conveying speed of the plate material 5 from each discharge port 53 so that it decreases slightly to the minus (minus) side in the opposite direction. it can.

  Therefore, the pressing liquid to be applied can be evenly applied to the surface of the plate 5 conveyed by the conveyor device 1 at a speed of, for example, 30 m / min or more in a short time of 1 to 2 seconds.

  Further, referring to FIG. 1B, in order to operate the liquid sprayed from the discharge ports 53 of the plurality of discharge flow path groups 9A, 9B of the upper nozzle 7U toward the surface of the plate member 5, Even when the opening state of the first and second electromagnetic valves 15 and 21 occurs instantaneously at the same time when the opening and closing operations of the first and second electromagnetic valves 15 and 21 are switched, the inside of the liquid discharge conduit 19A Since the liquid is once discharged into the liquid storage chamber 23 and the airtight state is divided by the breathing hole 61, the inside of the manifold 13 does not become a negative pressure.

  As a result, a phenomenon that has occurred as a conventional problem, that is, the liquid in each of the plurality of first liquid supply pipes 11 flows back to the manifold 13 side due to the negative pressure in the manifold 13. Thereafter, it is possible to prevent a situation in which the discharge time of the liquid sprayed from each discharge port 53 is delayed.

  Moreover, the height of P1 (and P3) at the end of the liquid discharge pipe 19A is the height of the liquid supply port 45 that supplies the discharge flow path groups 9A and 9B of the nozzle 7 from the first liquid supply pipe 11 to each other. Since it is disposed at almost the same height level as L2 (and P4) [L1≈L2, L3≈L4 in FIGS. 1A and 1B], each discharge flow path group 9A, 9B of the nozzle 7 is disposed. Therefore, it is possible to secure a spray amount of a fixed width of the press liquid.

  In particular, when the plate material 5 to which the press liquid is applied is short, the press liquid is intermittently ejected from each of the discharge flow path groups 9A and 9B of the nozzle 7, so that the press liquid is generally quantified. However, it is difficult to apply by the above-mentioned conditions, it is possible to easily secure the injection amount of the fixed amount of liquid by using the above conditions L1≈L2 and L3≈L4.

  Moreover, as shown in FIG. 3C, the cross-sectional area of each discharge port 53 of the final flow path of the discharge flow path groups 9A and 9B is such that the liquid is in the discharge flow path groups 9A and 9B. The upper nozzle 7U provided with these discharge ports 53 is shown in FIG. 1A because it is expanded to minimize the resistance force generated by the discharge flow path group wall surface and the viscosity of the liquid when flowing through the nozzle. As described above, the plurality of first solenoid valves 15 and the first liquid supply pipes 11 are disposed at approximately the same height level as the upper nozzle 7U between points b and c. A sufficient effect will be exhibited. The same applies to the lower nozzle 7L.

  That is, since the liquid can be discharged from the discharge ports 53 in a state where there is almost no resistance, the discharge speed of the liquid sprayed from the discharge ports 53 is not delayed, and the conveyance speed of the plate 5 is followed. In addition, the press liquid can be applied to the surface of the plate 5 in a short time of 1 to 2 seconds.

(A) is a schematic side view showing an arrangement state of upper and lower nozzles and a hydraulic circuit for coating in the press liquid coating apparatus according to the embodiment of the present invention, and (B) is viewed from the left side of (A). FIG. 1 is a schematic cross-sectional view of a press liquid coating apparatus according to an embodiment of the present invention. (A) is the front view in which the discharge flow path group was formed in one surface of the shim of embodiment of this invention, (B) is the state which expanded the cross section along the oil sump and the discharge flow path group (C) is a partial cross-sectional view taken along the line III-III in (A). (A) is a front view of a liquid storage chamber, (B) is a side view of (A). It is a top view which shows the arrangement | positioning state of the liquid application apparatus for a press at the time of a press molding process. (A) is a schematic side view showing an arrangement state of upper and lower nozzles and a hydraulic circuit for coating in a conventional press liquid coating apparatus, and (B) is a front view seen from the left side of (A). . It is a schematic sectional drawing of the conventional liquid application apparatus for a press. (A) is the front view in which the discharge flow path group was formed in one surface of the conventional shim, (B) is the longitudinal cross-sectional view of the state which expanded the cross section along the oil sump and the discharge flow path group. (C) is a fragmentary sectional view of an arrow VIII-VIII line of (A).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Conveyor apparatus 3 Liquid application apparatus 5 for presses Plate material (to-be-coated body)
7 Nozzle 7U Upper nozzle 7L Lower nozzle 9, 9A, 9B Discharge flow path group 11 1st liquid supply pipe line (1st liquid supply path)
13 Manifold 15 First solenoid valve (first open / close valve)
17 Second liquid supply line (second liquid supply line)
19A, 19B Liquid discharge channel (liquid discharge channel)
21 Second solenoid valve (second on-off valve)
23 Liquid storage chamber (duffer device)
27 Liquid pump 29 Liquid tank 31, 33 Nozzle blade 35 Slit 37 Shim 39 Nozzle head 45 Liquid supply port 47A, 47B Oil reservoir 59 Reservoir body 61 Breathing hole (brid air hole)
HSL height reference line

Claims (1)

A plurality of pressing liquid discharge flow path groups to be discharged toward the plate material, a lower nozzle, a first liquid supply path communicating with the discharge flow path group to supply the liquid, and the first liquid supply path. A first open / close valve interposed to open and close the liquid supply path, and the first open / close valve is disposed at substantially the same height level as the discharge flow path group of the upper and lower nozzles.
A manifold communicating with the plurality of first liquid supply paths to branch and supply the liquid; a second liquid supply path communicating with the manifold for supplying the liquid; and discharging the liquid in the manifold to the manifold. The upper liquid discharge path, the second open / close valve provided to open and close the lower liquid discharge path, and the liquid interposed in the lower liquid discharge path on the downstream side of the second open / close valve. A storage chamber,
Press from the lower liquid discharge path to the liquid storage chamber from the height of the liquid supply port to be supplied to each discharge flow path group of the upper and lower nozzles from the first liquid supply path and the downstream side of the second on-off valves. The height of the liquid discharge path for discharging the liquid for use is arranged at substantially the same level ,
The liquid storage chamber is provided in a storage chamber main body, a main body is provided in an upper portion of the storage chamber main body, a liquid discharge pipe line of a second opening / closing valve is connected in the main body, and the liquid storage chamber The press liquid application apparatus is characterized in that the upper part of the press is connected to a breather hole communicating with the outside air at a position above the connecting part connected to the liquid discharge conduit .

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