JP2007125488A - Ejection apparatus of liquid material, coating device of liquid material, and coating method of liquid material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ejection apparatus of a liquid material with a compact and simple structure which is capable of preventing the curing of the liquid material in the syringe part. <P>SOLUTION: The ejection apparatus of the liquid material is provided with the syringe part 27a to store the liquid material 70 which is cured by the reaction with moisture in air and a first curing prevention liquid 81 which prevents the curing of the liquid material 70 by forming a layer on the liquid face of the liquid material 70, a nozzle part 27b with an ejection port 27b1 located below the syringe part 27a to communicate with the syringe part 27a and a pressurization pump 23 which ejects the liquid material 70 from the ejection port 27b1 by pressurizing the liquid face of the first curing prevention liquid 81 to push down. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a discharge device that discharges a liquid material that reacts with moisture in the air and cures, a coating device that applies the liquid material to a coating object, and a coating method, and in particular, a silicon-based adhesive or cyanoacrylate. The present invention relates to a discharge device that discharges a system adhesive and the like, a coating apparatus that applies a silicon adhesive, a cyanoacrylate adhesive, and the like to an application target, and a coating method.

  Condensation reaction type RTV (Room Temperature Vulcanizing) rubber, cyanoacrylate adhesive, etc. (hereinafter also simply referred to as a liquid material) typified by silicone adhesives are of a type that cures by reacting with moisture in the air. It is a liquid resin material and is used in various industrial fields. The use includes adhesion between members, sealing of the members, and the like. For example, in the scene of mounting an electronic component on a circuit board, the electronic component is used for bonding the electronic component to the circuit board or sealing the electronic component mounted on the circuit board.

  Normally, this type of liquid material is applied to an application object by a discharge device. The discharge device has a syringe part for storing the liquid material and a nozzle part provided with a discharge port for discharging the liquid material stored in the syringe part, and the liquid surface of the liquid material stored in the syringe part is provided. This is a device that discharges a required amount of liquid material from a discharge port by applying pressure. As a pressurizing means for pressurizing the liquid surface of the liquid material, a pressurizing pump for sending compressed air into a syringe, a piston fitted in a syringe part, a motor for driving the piston, and the like are generally used. In addition to this discharge device, a production facility provided with a table including a placement unit on which the application target is placed, a moving mechanism for changing the relative position between the discharge device and the placement unit, and the like. Is specifically referred to as a coating device.

  In the above discharge device, the liquid material filled in the syringe part gradually hardens on the liquid surface to form a film, and this film adheres to the inner wall surface of the syringe part and becomes a lump, which clogs the nozzle part and becomes liquid. There is a problem that the discharge of the material is hindered, the discharge amount is reduced, and the stable liquid material cannot be discharged. This is because the liquid material is cured by reacting with moisture in the air when exposed to the air. Such a problem is peculiar to a discharge device that discharges a liquid material that reacts with moisture in the air and hardens.

  In the discharge device using the pressurizing pump as the pressurizing means, the liquid surface of the liquid material in the syringe portion and the liquid surface of the liquid material located at the discharge port portion are exposed to air. In this case, a film of a cured material of the liquid material is generated. Further, in the discharge device using the piston and the driving means for driving the piston as the pressurizing means, air enters the syringe part from the gap between the piston and the syringe part, so the liquid level of the liquid material located at the discharge port part Not only that, the liquid surface of the liquid material in the portions contacting the piston is exposed to air, and a film of a cured material of the liquid material is generated in these portions. In particular, when air enters the syringe part from the gap between the piston and the syringe part, the liquid material is cured in the syringe part, and the piston and the syringe part are bonded to each other. And it becomes a big problem.

For example, Japanese Patent Laid-Open No. 10-68648 (Patent Document 1) discloses a discharge device in which curing of the liquid material in the syringe portion is prevented. In the discharge device disclosed in Patent Document 1, the space in the syringe part is partitioned by a bag-like tube, and the liquid material is filled in the space that leads to the discharge port among the spaces partitioned by the tube. The incompressible liquid is sealed in the other space. Then, by pressurizing the liquid surface of the incompressible liquid with the piston, a liquid material having an amount corresponding to the moving amount of the piston is discharged from the discharge port by a predetermined amount. Further, the discharge device disclosed in Patent Document 1 is configured such that nitrogen is blown to the discharge port located at the tip of the nozzle portion during standby when the liquid material is not discharged. Therefore, in the discharge device disclosed in Patent Document 1, since the liquid material is separated from the air by nitrogen blown to the tip of the tube and the nozzle portion arranged in the syringe portion, the liquid material is moisture in the air. Curing in response to is effectively suppressed.
JP 10-68648 A

  However, in the case of the discharge device disclosed in Patent Document 1, it is necessary to dispose a tube in the syringe portion, so that the configuration of the device is complicated and the maintainability is greatly reduced. . In addition, since a space for storing an incompressible liquid equal to or more than the filling amount of the liquid material is required, there is a problem that the apparatus is greatly increased in size.

  Accordingly, the present invention has been made to solve the above-mentioned problems, and provides a liquid material discharge device and a liquid material coating device having a small and simple configuration capable of preventing the liquid material from hardening in the syringe part. In addition, an object of the present invention is to provide a method for applying a liquid material that can stably and easily eject a liquid material and can stably supply the liquid material to an object to be applied. .

  The liquid material discharge device according to the present invention includes a syringe portion, a nozzle portion, and a pressurizing means. The syringe unit stores a liquid material that cures by reacting with moisture in the air, and a first curing preventing liquid that prevents the liquid material from curing by forming a layer on the liquid surface of the liquid material. The nozzle part is located below the syringe part and has a discharge port communicating with the syringe part. The pressurizing unit discharges the liquid material from the discharge port by pressurizing and pressing down the liquid surface of the first curing preventing liquid.

  By comprising in this way, since the liquid level of the liquid material in a syringe part will be covered with a 1st hardening prevention liquid, a liquid material and air will not contact in a syringe part. Accordingly, the curing of the liquid material is hindered, and the liquid material can be stably discharged. The filling amount of the first curing preventing liquid only needs to cover the liquid surface of the liquid material in the syringe part, and the apparatus does not increase in size. Furthermore, it is possible to simplify the device configuration without complicating the configuration in the syringe unit.

  In the liquid material discharge device according to the present invention, when a silicon adhesive or a cyanoacrylate adhesive is employed as the liquid material, the first curing preventing liquid is alcohol, glycol, aromatic hydrocarbon, liquid paraffin. It is preferable that at least one selected from the group consisting of oleic acid and the oleic acid is contained as a component, and it is particularly preferable that the first curing preventing liquid contains normal butanol as a main component.

  Examples of the liquid material that cures by reacting with moisture in the air include a silicon-based adhesive or a cyanoacrylate-based adhesive as described above. Accordingly, the first curing preventing liquid needs to be a liquid having a lighter specific gravity and a low hygroscopicity than these silicon-based adhesives or cyanoacrylate-based adhesives, and these silicon-based adhesives or cyanoacrylate-based liquids. A low-volatility stable liquid that does not easily react with the adhesive is more preferable. Examples of the liquid satisfying such conditions include alcohols, glycols, aromatic hydrocarbons, liquid paraffin, oleic acid, and the like. Particularly, normal butanol is suitable, and if these liquids are used as the first curing preventing liquid, A stable liquid material can be discharged.

  In the liquid material discharge device according to the present invention, the discharge port is closed by inserting the nozzle portion, thereby storing the second curing preventing liquid for preventing the liquid material from hardening. It is preferable to further include a reservoir.

  By configuring in this way, the liquid surface of the liquid material located at the discharge port portion provided in the nozzle portion is prevented from second hardening by inserting the nozzle portion into the storage portion during standby when the liquid material is not discharged. Since it is covered with the liquid, the liquid material and air do not come into contact with each other in this portion. Accordingly, the liquid material is prevented from being cured, and the liquid material is not cured during standby. Therefore, it is possible to stably discharge the liquid material from the discharge port after standby.

  In the liquid material discharge device according to the present invention, when a silicon adhesive or a cyanoacrylate adhesive is employed as the liquid material, the second curing preventing liquid is alcohol, glycol, aromatic hydrocarbon, liquid paraffin. It is preferable that at least one selected from the group consisting of oleic acid and the oleic acid is included in the component, and it is particularly preferable that the second curing preventing liquid contains normal butanol as a main component.

  Examples of the liquid material that cures by reacting with moisture in the air include a silicon-based adhesive or a cyanoacrylate-based adhesive as described above. Therefore, the second curing preventing liquid needs to be a low hygroscopic liquid, and it is difficult to react with these silicon-based adhesives or cyanoacrylate-based adhesives, and it should be a low-volatile stable liquid. Even more preferred. Examples of the liquid satisfying such conditions include alcohols, glycols, aromatic hydrocarbons, liquid paraffin, oleic acid, and the like. Particularly, normal butanol is suitable, and if these liquids are used as the second curing preventing liquid, A stable liquid material can be discharged.

  In the liquid material discharge device according to the present invention, the pressurizing means may be constituted by compressed air supply means for supplying compressed air to the syringe section.

  Thus, even when the compressed air supply means is adopted as the pressurizing means, the liquid surface of the liquid material in the syringe part is covered with the first curing preventing liquid, so the compressed air supplied by the compressed air supply means And liquid material do not come into contact. Therefore, the liquid material is not cured in the syringe part, and the liquid material can be stably discharged.

  In the liquid material discharge device according to the present invention, the pressurizing means may be constituted by a piston slidably fitted in the syringe part and a drive means for driving the piston. Good.

  As described above, even when the piston and the driving means for driving the piston are used as the pressurizing means, the liquid surface of the liquid material in the syringe part is covered with the first curing preventing liquid, and therefore the gap between the piston and the syringe part. Even when air enters the syringe part from the air, the air and the liquid material do not come into contact with each other. Therefore, the liquid material is not cured in the syringe part, and the liquid material can be stably discharged.

  A liquid material coating apparatus according to the present invention includes any one of the above-described liquid material ejection devices, a placement unit on which an application target to which the liquid material ejected from the ejection devices is applied, A moving mechanism that relatively moves the discharge device and the placement unit, a detection unit that detects information on the application target, and the discharge device based on information on the application target detected by the detection unit And control means for controlling the moving mechanism.

  By comprising in this way, it can be set as the application | coating apparatus of the liquid material provided with the discharge apparatus of the liquid material of a small and simple structure. In addition, since the application unit suitable for the application target is selected by the detection unit and the control unit, and the discharge device and the moving mechanism are controlled accordingly, the liquid material can be applied according to the application target. It can be set as the application | coating apparatus of a liquid material.

  A method for applying a liquid material according to the present invention is a method of applying a liquid material that cures by reacting with moisture in the air to an object to be applied, the step of filling the liquid material into a syringe part, and the inside of the syringe part Filling a first curing preventing liquid for preventing the liquid material from hardening by forming a layer on the liquid surface of the liquid material, and pressurizing and depressing the liquid level of the first curing liquid And a step of discharging the liquid material from a discharge port provided in a nozzle portion located below the syringe portion, thereby applying the liquid material to the application object.

  By adopting such an application method, the liquid surface of the liquid material in the syringe part is covered with the first curing preventing liquid, so that the liquid material and air do not contact in the syringe part. Accordingly, the curing of the liquid material is prevented, the liquid material can be discharged stably and easily, and the liquid material can be stably supplied to the application target.

  In the method for applying a liquid material according to the present invention, when a silicon adhesive or a cyanoacrylate adhesive is used as the liquid material, the first curing preventing liquid is alcohol, glycol, aromatic hydrocarbon, liquid paraffin. It is preferable that at least one selected from the group consisting of oleic acid and the oleic acid is contained as a component, and it is particularly preferable that the first curing preventing liquid contains normal butanol as a main component.

  Examples of the liquid material that cures by reacting with moisture in the air include a silicon-based adhesive or a cyanoacrylate-based adhesive as described above. Accordingly, the first curing preventing liquid needs to be a liquid having a lighter specific gravity and a low hygroscopicity than these silicon-based adhesives or cyanoacrylate-based adhesives, and these silicon-based adhesives or cyanoacrylate-based liquids. A low-volatility stable liquid that does not easily react with the adhesive is more preferable. Examples of the liquid satisfying such conditions include alcohols, glycols, aromatic hydrocarbons, liquid paraffin, oleic acid, and the like. Particularly, normal butanol is suitable, and if these liquids are used as the first curing preventing liquid, A stable liquid material can be discharged.

  In the method for applying the liquid material according to the present invention, after the liquid material and the first curing preventing liquid are filled in the syringe part, the standby state in which the liquid material is not applied to the application target is performed. At the time, the step of closing the discharge port with the second curing preventing liquid by inserting the nozzle part into the storing part in which the second curing preventing liquid is stored, thereby further preventing the liquid material from curing. It is preferable to provide.

  By adopting such a coating method, the liquid surface of the liquid material located in the discharge port portion provided in the nozzle portion can be changed by inserting the nozzle portion into the storage portion during standby when the liquid material is not discharged. 2 Since it will be covered with the anti-curing liquid, the liquid material and air will not come into contact at this portion. Accordingly, the liquid material is prevented from being cured, and the liquid material is not cured during standby. Therefore, it is possible to stably discharge the liquid material from the discharge port after standby.

  In the liquid material coating method according to the present invention, when a silicon adhesive or a cyanoacrylate adhesive is used as the liquid material, the second curing preventing liquid is alcohol, glycol, aromatic hydrocarbon, liquid paraffin. It is preferable that at least one selected from the group consisting of oleic acid and the oleic acid is included in the component, and it is particularly preferable that the second curing preventing liquid contains normal butanol as a main component.

  Examples of the liquid material that cures by reacting with moisture in the air include a silicon-based adhesive or a cyanoacrylate-based adhesive as described above. Therefore, the second curing preventing liquid needs to be a low hygroscopic liquid, and it is difficult to react with these silicon-based adhesives or cyanoacrylate-based adhesives, and it should be a low-volatile stable liquid. Even more preferred. Examples of the liquid satisfying such conditions include alcohols, glycols, aromatic hydrocarbons, liquid paraffin, oleic acid, and the like. Particularly, normal butanol is suitable, and if these liquids are used as the second curing preventing liquid, A stable liquid material can be discharged.

  ADVANTAGE OF THE INVENTION According to this invention, it can be set as the liquid material discharge apparatus and liquid material application apparatus of the small and simple structure which can prevent hardening of the liquid material in a syringe part. Moreover, according to this invention, it can be set as the coating method of the liquid material which can discharge a liquid material stably and easily, and can supply a liquid material stably to a coating target object.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In the embodiment shown below, a liquid material (condensation reaction type RTV rubber represented by a silicon-based adhesive) that cures by reacting with moisture in the air on an electronic component mounted on a circuit board as a workpiece. A liquid material discharge device for sealing an electronic component by applying a cyanoacrylate adhesive or the like, a coating device including the same, and a coating method will be described as an example.

  FIG. 1 is a schematic perspective view showing an external configuration of a liquid material coating apparatus according to an embodiment of the present invention. FIG. 2 is a block diagram illustrating a configuration of a functional unit of the liquid material coating apparatus according to the present embodiment. First, with reference to these drawings, an external structure and a functional unit configuration of the liquid material coating apparatus according to the present embodiment will be described.

  As shown in FIG. 2, the liquid material coating apparatus 1 according to the present embodiment includes a control unit 10 as a control means, a discharge unit 20 as a discharge apparatus, a three-axis robot 30 as a moving mechanism, and a detection means. The visual sensor 40 and the displacement sensor 54, and the illumination device 52 as means for assisting the detection of the visual sensor 40 are provided as functional units.

  As shown in FIG. 2, the control unit 10 includes a CPU 11, a storage device 12, a timer 13, an operation unit 14, and a display unit 15, and includes a discharge unit 20, a three-axis robot 30, and a visual sensor 40. The lighting device 52 and the displacement sensor 54 are controlled. Specifically, the CPU 11 performs various arithmetic processes based on various information output from the visual sensor 40 and the displacement sensor 54, and comprehensively controls the discharge unit 20 and the three-axis robot 30 based on the results. Outputs a command. The storage device 12 stores liquid material information and workpiece information in a database. The timer 13 records various times during the operation of the coating apparatus 1. The operation unit 14 is a part to which a user command is input, and the display unit 15 is a part for displaying various information and the like.

  The discharge unit 20 includes a CPU 21, a storage device 22, a pressure pump 23, a valve 24 and a pressure sensor 25 shown in FIG. 2, and a discharge unit 26 shown in FIG. 1, and reacts with moisture in the air to cure. The liquid material to be discharged is discharged from the discharge unit 26. Specifically, the CPU 21 controls the other components constituting the discharge unit 20 in an integrated manner based on a command output from the CPU 11 of the control unit 10. The storage device 22 stores optimum pressure information for pressurization by the pressurizing pump. The pressurizing pump 23 generates compressed air and supplies the compressed air to the discharge unit 26. The valve 24 maintains the pressure in the discharge unit 26 in the closed state, and introduces compressed air generated by the pressurizing pump 23 into the discharge unit 26 in the open state. The pressure sensor 25 detects the pressure in the discharge unit 26 and outputs the detection result to the CPU 21. In addition, although the discharge part 26 is a site | part which stores the 1st hardening prevention liquid which prevents the hardening of the liquid material which reacts with the water | moisture content in air, and a liquid material, it shall suppose that it mentions later for details.

  The 3-axis robot 30 includes the CPU 31, the storage device 32, the X-axis robot motor 33a, the Y-axis robot motor 34a, and the Z-axis robot motor 35a shown in FIG. 2, and the X-axis robot 33 and the Y-axis robot shown in FIG. 34 and a Z-axis robot 35. The discharge unit 26 of the discharge unit 20 is mainly moved in the X, Y, and Z-axis directions, and the visual sensor 40, the illumination device 52, and the displacement sensor 54 are moved to X, Secondary movement is performed in the three axis directions of the Y and Z axes. Specifically, the CPU 31 controls the X-axis robot motor 33a, the Y-axis robot motor 34a, and the Z-axis robot motor 35a based on a command output from the CPU 11 of the control unit 10. The storage device 32 stores various route patterns (coordinates, reference speeds for scanning, etc.) mainly for moving the discharge unit 20. The X-axis robot motor 33a, the Y-axis robot motor 34a, and the Z-axis robot motor 35a drive the X-axis robot 33, the Y-axis robot 34, and the Z-axis robot 35, respectively, and mainly control the discharge unit 26 of the discharge unit 20. While moving in the three axis directions of the X, Y, and Z axes, the visual sensor 40, the illumination device 52, and the displacement sensor 54 are secondarily moved in the three axis directions of the X, Y, and Z axes.

  As shown in FIG. 2, the visual sensor 40 includes a CPU 41, a storage device 42, an image processing device 43, and a camera 44, and information on the workpiece such as the type of workpiece and the state of application to the control unit 10. Output. Specifically, the CPU 41 instructs the camera 44 via the image processing device 43 to take an image of a workpiece based on a command output from the CPU 11 of the control unit 10 or an image output from the image processing device 43. In response to the input of the processing result, the workpiece information is output to the control unit 10. The storage device 42 stores an image processing method, a work type specifying method, a target parameter, and the like. The image processing device 43 obtains the type of workpiece, the coating area of the liquid material, and the like from the image captured by the camera 44 and outputs the obtained information to the CPU 41. The camera 44 images a workpiece based on a command from the CPU 41.

  The illumination device 52 is a light source used when the work is imaged by the camera 44, and its on / off is controlled by the CPU 11 of the control unit 10. The displacement sensor 54 detects the height of the workpiece based on the command output from the CPU 11 of the control unit 10 and outputs the detection result to the CPU 11.

  As shown in FIG. 1, the liquid material coating apparatus 1 according to the present embodiment measures a placement unit 61 for placing a work on a table 60 and the amount of liquid material applied to the work. Application amount detection unit 66, the above-described X-axis robot 33, Y-axis robot 34, and Z-axis robot 35, a storage unit 62 for storing the second curing preventing liquid, and a nozzle unit 27b of the discharge unit 26 (FIG. 3). And a cleaning sponge 64 for cleaning the front end. In addition, the above-mentioned discharge unit scanned by the X-axis robot 33, the Y-axis robot 34, and the Z-axis robot 35 at a predetermined position of the moving mechanism including the X-axis robot 33, the Y-axis robot 34, and the Z-axis robot 35. 26, a camera 44, a lighting device 52, and a displacement sensor 54 are attached. Accordingly, the discharge unit 26, the camera 44, the illumination device 52, and the displacement sensor 54 move in three directions indicated by arrows X, Y, and Z in FIG.

  FIG. 3 is a schematic cross-sectional view showing the structure of the discharge section of the liquid material coating apparatus in the present embodiment. FIG. 4 is a schematic cross-sectional view showing a state in which the tip of the nozzle portion is inserted into the second curing preventing liquid filled in the storage portion in the liquid material coating apparatus according to the present embodiment. In the following, referring to these drawings, the structure of the discharge unit of the liquid material coating apparatus in the present embodiment, the discharge operation of the discharge unit, the state of the discharge unit during standby, and the liquid material in the present embodiment The coating method will be described.

  First, the structure of the discharge unit of the liquid material coating apparatus according to the present embodiment will be described. As shown in FIG. 3, the discharge part 26 of the discharge unit 20 includes a syringe part 27a, a nozzle part 27b, and a cap part 27c. Syringe part 27a consists of a substantially cylindrical member which the upper end and the lower end opened, and the tip part of the lower end side is formed in the tapered shape. The nozzle portion 27b is formed of a cylindrical member that is inserted into and fixed to the distal end portion on the lower end side of the syringe portion 27a, and has a discharge port 27b1 at the lower end portion thereof. The cap part 27c is attached so as to close the upper end opening of the syringe part 27a, and the tube 28 is connected to the upper part thereof. The cap portion 27c to which the tube 28 is connected is provided with a through hole 27c1 extending in the vertical direction. The through hole 27c1 communicates with the space inside the syringe portion 27a. The end of the tube 28 opposite to the end connected to the cap portion 27c is connected to the pressurizing pump 23 described above.

  The syringe part 27a is filled with a liquid material 70 that cures by reacting with moisture in the air. The liquid material 70 has an appropriate viscosity, and the discharge port 27b1 provided in the nozzle portion 27b has a very small opening diameter. Therefore, in the state shown in FIG. The syringe part 27a and the nozzle part 27b are maintained in a state where they do not sag from 27b1 to the outside of the discharge part 26.

  In addition to the liquid material 70 described above, the syringe portion 27 a is filled with a first curing preventing liquid 81 that prevents the liquid material 70 from curing. Here, as the first curing preventing liquid 81, a liquid having a specific gravity smaller than that of the liquid material 70 and a low hygroscopic property is selected, and more preferably, the liquid does not easily react with the liquid material 70 and has a low volatility. A stable liquid is selected. For example, when a silicon adhesive or a cyanoacrylate adhesive is employed as the liquid material 70, alcohol, glycol, aromatic hydrocarbon, liquid paraffin, oleic acid, or the like is employed as the first curing preventing liquid 81. In particular, normal butanol is most suitable.

  As described above, in the coating apparatus 1 according to the present embodiment, since the liquid having a specific gravity lower than that of the liquid material 70 is selected as the first curing prevention liquid 81, the first curing prevention filled in the syringe part 27a. The liquid 81 forms a layer on the liquid surface of the liquid material 70 located in the syringe part 27a. Thereby, since the liquid material 70 and the air 27a1 introduced into the syringe part 27a do not come into contact with each other due to the presence of the first curing preventing liquid 81, the liquid material 70 is prevented from being cured in this portion. The first curing preventing liquid 81 only needs to be filled so that at least the liquid surface of the liquid material 70 located in the syringe portion 27 a is covered with the first curing preventing liquid 81. Very small amount compared to.

  Next, the discharge operation of the discharge unit of the liquid material coating apparatus and the state of the discharge unit during standby will be described. In the coating apparatus 1 in the present embodiment, in order to discharge the liquid material 70 from the discharge unit 26, the pressure pump 23 shown in FIGS. 2 and 3 is driven and the valve 24 shown in FIG. 2 is opened. Thereby, compressed air will be sent in into the syringe part 27a via the tube 28 shown in FIG. 3, As a result, the pressure of the air 27a1 in the syringe part 27a will rise. Therefore, the liquid surface of the first curing preventing liquid 81 is pushed down, and the liquid material 70 is pushed down by the first curing preventing liquid 81 and discharged from the discharge port 27b1 to the outside.

  On the other hand, in the coating apparatus 1 according to the present embodiment, in order to prevent the liquid material 70 from being discharged from the discharge unit 26 during standby or the like, the driving of the pressure pump 23 shown in FIGS. The indicated valve 24 is closed. Thereby, the rise of the internal pressure in the syringe part 27a shown in FIG. 2 is stopped, and the pressurization to the first curing preventing liquid 81 by the air 27a1 in the syringe part 27a is released. Accordingly, the liquid surface of the first curing preventing liquid 81 is not pushed down, and the discharge of the liquid material 70 from the discharge port 27b1 is stopped.

  Further, when it is necessary to maintain the standby state for a longer time than the predetermined time, the three-axis robot 30 is driven to move the discharge unit 26 to the storage unit 62, and as shown in FIG. The distal end is inserted into the storage part 62 so that the discharge port 27b1 is closed by the second curing preventing liquid 82 filled in the storage part 62.

  Here, as the second curing preventing liquid 82, a liquid having a low hygroscopic property is selected, and more preferably, a stable liquid that hardly reacts with the liquid material 70 and has a low volatility is selected. Further, if the second curing preventing liquid 82 is a low-viscosity liquid, an effect that it is easy to wipe off can be obtained. For example, when a silicon adhesive or a cyanoacrylate adhesive is employed as the liquid material 70, alcohol, glycol, aromatic hydrocarbon, liquid paraffin, oleic acid, or the like is employed as the second curing preventing liquid 82. In particular, normal butanol is most suitable. In addition, the 1st hardening prevention liquid 81 and the 2nd hardening prevention liquid 82 do not necessarily need to be the same kind of liquid, You may select a different liquid.

  As described above, when the tip of the nozzle portion 27b is inserted into the storage portion 62 and the discharge port 27b1 is closed with the second curing prevention liquid 82 filled in the storage portion 62, the second curing is performed. Since the liquid surface of the liquid material 70 located in the discharge port 27b1 portion is covered with the prevention liquid 82, the liquid material 70 and the air that is the outside air do not contact with each other in this portion. Therefore, the liquid material 70 does not come into contact with air and harden even when it is in a standby state for a long time.

  Next, a method for applying the liquid material in the present embodiment will be described. In order to apply the liquid material to the workpiece, first, the connection between the tube 28 and the cap portion 27 c is disconnected, and only the discharge portion 26 is removed from the coating apparatus 1. And the liquid material 70 is filled in the syringe part 27a of the discharge part 26 taken out. Filling the syringe part 27a with the liquid material 70 is performed, for example, by removing the cap part 27c from the syringe part 27a and pouring the liquid material 70 from the upper end opening of the syringe part 27a.

  Next, the first curing preventing liquid 81 is filled into the syringe part 27 a filled with the liquid material 70. The filling of the first curing preventing liquid 81 into the syringe part 27a is performed, for example, by pouring the first curing preventing liquid 81 from the upper end opening of the syringe part 27a from which the cap part 27c has been removed following the filling of the liquid material 70. Immediately after the first curing preventing liquid 81 is poured into the syringe part 27a, the liquid material 70 and the first curing preventing liquid 81 are mixed, but the liquid material is left by leaving for a while. 70 and the first curing prevention liquid 81 are separated from the difference in specific gravity, and a layer of the first curing prevention liquid 81 is formed on the liquid surface of the liquid material 70 as shown in FIG.

  While maintaining the state in which the layer of the first hardening preventing liquid 81 is formed on the liquid surface of the liquid material 70, the cap part 27c is attached by attaching the syringe part 27a, and further discharging by connecting the tube 28 to the cap part 27c. The unit 26 is set in the coating apparatus 1. And the workpiece | work which is a coating object is mounted in order on the mounting part 61 of the coating device 1 shown in FIG. 1, and the pressure pump 23 grade | etc., Drives the discharge port 27b1 provided in the nozzle part 27b. The liquid material 70 is discharged, and the liquid material 70 is applied to the workpiece.

  Further, when maintaining a standby state in which the discharge operation is not performed for a predetermined time or longer, the nozzle portion 27b of the discharge portion 26 is placed in the storage portion 62 in which the second curing preventing liquid 82 is stored as described above. By inserting, the discharge port 27b1 is closed with the second curing preventing liquid 82.

  In the above description, the case where a pressurizing pump is used as the pressurizing unit has been described as an example. However, as the pressurizing unit, a piston and a drive motor as a driving unit for driving the piston are also employed. It is also possible to do. FIG. 5 is a schematic cross-sectional view illustrating a configuration example of a discharge unit when a piston and a drive motor that drives the piston are employed as the pressurizing unit. As shown in FIG. 5, when a piston and a drive motor are used as the pressurizing means, the piston 29 is inserted into the upper end opening of the syringe part 27a of the discharge part 26 'and the piston 29 is driven by the drive motor 23'. The configuration is as follows. And it is comprised so that the liquid level of the 1st hardening prevention liquid 81 with which it fills in the syringe part 27a with the lower end surface of piston 29 and forms the layer may be pressurized. In this case, the above-described valve 24 is not necessary.

  Even when configured in this manner, the presence of the first curing prevention liquid 81 prevents the air flowing into the syringe part 27a from the gap between the piston 29 and the syringe part 27a from coming into contact with the liquid material 70. In this portion, the liquid material 70 is prevented from curing. Even in such a configuration, if necessary, the tip of the nozzle portion 27b may be inserted into the storage portion 62 filled with the second curing preventing liquid 82 as shown in FIG. 4 during standby.

  In addition, in the coating apparatus that applies a liquid material that reacts with moisture in the air and hardens as in the present embodiment, it is more preferable to use an air-type dispensing system that uses the above-described pressure pump as a pressure unit. Is preferred. The reason is that, in the case of the piston type, there is a concern that frictional heat is generated between the piston and the syringe part when the piston slides, and the liquid material or the first curing preventing liquid is denatured. This is because there is a concern that bubbles may be caught in the liquid material when the piston slides. In addition, when a pneumatic dispensing system is used, a general-purpose syringe can be used as a discharge unit. Therefore, if a plurality of syringes are prepared, the working efficiency is dramatically improved.

  As described above, the syringe part 27a is filled with the first curing preventing liquid 81 and / or the second curing preventing liquid 82 by adopting the liquid material coating apparatus and coating method according to the present embodiment. Since the liquid material 70 is covered, the liquid material 70 is prevented from coming into contact with air and reacting with moisture to be cured in the syringe portion 27a or in the vicinity of the discharge port 27b1. Therefore, the liquid material 70 can be stably discharged. This eliminates the need for the work of removing the cured product at regular intervals, which has been necessary in the past, so that the production efficiency can be improved. Further, the filling amount of the first curing preventing liquid 81 only needs to be a filling amount sufficient to cover the liquid surface of the liquid material 70 in the syringe part 27a, and the apparatus does not increase in size. Furthermore, it is possible to simplify the apparatus configuration without complicating the configuration in the syringe part 27a.

  FIG. 6 is a diagram showing a concept of application control of the liquid material application apparatus in the present embodiment. As shown in FIG. 6, in the liquid material application apparatus 1 according to the present embodiment, the information from various sensors and information on the liquid material to be applied are collated, the optimum application condition is selected, and the discharge unit 20 and Commands to the 3-axis robot 30. Here, the various sensors correspond to the visual sensor 40 and the displacement sensor 54 shown in FIG. 2, and information on the liquid material to be applied is stored as a database in the storage device 12 of the control unit 10 shown in FIG. . The information from various sensors corresponds to the type of workpiece, the height of the workpiece, the application area at the time of the previous application to the workpiece, the elapsed time since the previous operation, and the like. On the other hand, as information on the liquid material to be applied, depending on the type of liquid material to be applied, what is the optimum application route (for example, spiral or zigzag), and how often the environment of the application device varies This corresponds to whether it is preferable to consider or how many minutes it is preferable to remove the hardened component of the liquid material at the tip of the nozzle portion with a cleaning sponge. On the other hand, the specific command content to the discharge unit 20 and the three-axis robot 30 corresponds to the height of the nozzle portion with respect to the workpiece, the discharge time, the sweep path, the sweep speed, the cleaning operation, and the like.

  FIG. 7 is a flowchart showing the operation of the liquid material coating apparatus according to the present embodiment. As shown in FIG. 7, in the liquid material coating apparatus 1 according to the present embodiment, after the coating apparatus 1 is started in step S <b> 1, the workpiece is set on the placement unit 61 in step S <b> 2. In step S <b> 3, the workpiece is imaged by the visual sensor 40, and the type of workpiece is determined based on the image captured by the camera 44. Subsequently, the height of the workpiece is detected by the displacement sensor 54 in step S4. The optimum application conditions are selected based on the information on the type of workpiece and the height of the workpiece, and the liquid material is applied to the workpiece in step S5. Thereafter, in step S <b> 6, the work is imaged again by the visual sensor 40, and the application area of the liquid material is detected based on the image captured by the camera 44. Furthermore, in step S7, the application amount of the liquid material is detected by the application amount detection unit 66, and when it is determined that the material is acceptable, the work is taken out from the placement unit 61 in step S8 and the operation is completed. When it is determined that either the application area or the application amount of the liquid material detected in step S6 or step S7 is unacceptable, the application operation corresponding to the shortage is repeated again.

  FIG. 8 is a more detailed flow chart when a specific operation included in the operation flow of the liquid material application apparatus according to the present embodiment is viewed as input / output to / from the CPU of the control unit. It is a block diagram which shows the input / output condition with respect to CPU of the control unit in the case of each operation | movement shown in the specific operation | movement flow shown in FIG. In addition, the circle number attached | subjected to the arrow shown in FIG. 9 respond | corresponds to the circle number attached | subjected to each operation | movement shown in FIG.

  As shown in FIGS. 8 and 9, when the production start signal and the resin information are input to the CPU 11 by the operator operating the operation unit 14 in step S101, the CPU 11 starts from the timer 13 from the previous action in step S102. The elapsed time is acquired, and the next action is determined in step S103. At that time, if it is determined to shift to the cleaning operation, the process shifts to step S112, and the CPU 11 outputs a cleaning command to the three-axis robot 30.

  If it is determined in step S103 to shift to the application operation, input of work image information from the visual sensor 40 to the CPU 11 (step S104) and work shape information from the displacement sensor 54 are performed in parallel after step S101. In step S106, the workpiece height is input from the displacement sensor 54 to the CPU 11 in step S106. Next, the type of the workpiece is determined based on the workpiece image information input in step S104, and based on the result, the application information database stored in the storage device 12 is searched in step S107. Application information to be input is input to the CPU 11.

  In response to the input of the above information, the CPU 11 selects the optimum conditions for the coating operation in step S108 and calculates the sweep speed. Subsequently, the CPU 11 outputs the optimum conditions (optimum path number, application height, etc.) selected in step S108 and the sweep speed to the triaxial robot 30 in step S109, and then outputs a discharge command to the discharge unit 20 in step S110. To do. After ejection, the application area is input from the visual sensor 40 to the CPU 11 in step S111, and then the process returns to step S102. In step S103, when it is determined that the next action is to be ended, the operation of the coating apparatus 1 is ended.

  FIG. 10 is a more detailed flow chart when a specific operation included in the operation flow of the liquid material application apparatus according to the present embodiment is viewed as an input / output to / from the CPU of the visual sensor. It is a block diagram which shows the input / output condition with respect to CPU of the visual sensor in the case of each operation | movement shown to the specific operation | movement flow shown in FIG. In addition, the circle number attached | subjected to the arrow shown in FIG. 11 respond | corresponds to the circle number attached | subjected to each operation | movement shown in FIG.

  As shown in FIGS. 10 and 11, when a work type determination command is input from the control unit 10 to the CPU 41 of the visual sensor 40 in step S <b> 201, the CPU 41 sends an image processing device 43 to the camera 44. Outputs workpiece imaging command. The image captured by the camera 44 is input to the image processing device 43 in step S203, and predetermined parameters are extracted based on this image information in the image processing device 43. Thereafter, the result is input to the CPU 41 in step S204. Is done. In step S205, the CPU 41 reads a model for each type of workpiece from the storage device 42, compares this with a parameter input from the image processing device 43, and specifies the type of workpiece. Then, the CPU 41 outputs the result to the control unit 10 in step S206.

  On the other hand, as shown in FIGS. 10 and 11, when an application area measurement command is input from the control unit 10 to the CPU 41 of the visual sensor 40 in step S <b> 202, the CPU 41 passes the camera 44 through the image processing device 43. Output the workpiece imaging command. The image captured by the camera 44 is input to the image processing device 43 in step S203, and predetermined parameters are extracted based on this image information in the image processing device 43. Thereafter, the result is input to the CPU 41 in step S204. Is done. In step S207, the CPU 41 reads the quality model of the application area from the storage device 42, compares it with the parameter input from the image processing device 43, and calculates a difference parameter. Then, the CPU 41 outputs the calculated difference parameter to the control unit 10 in step S208.

  FIG. 12 is a more detailed flow chart when a specific operation included in the operation flow of the liquid material coating apparatus according to the present embodiment is viewed as input / output to / from the CPU of the three-axis robot. 12 is a block diagram showing an input / output situation with respect to the CPU of the three-axis robot during each operation shown in the specific operation flow shown in FIG. In addition, the circle number attached | subjected to the arrow shown in FIG. 13 respond | corresponds to the circle number attached | subjected to each operation | movement shown in FIG.

  As shown in FIGS. 12 and 13, when a cleaning command is input from the control unit 10 to the CPU 31 of the triaxial robot 30 in step S301, the CPU 31 reads a path pattern from the storage device 32 in step S303, and in step S304. Coordinate correction is performed. The CPU 31 derives a drive command for each of the X-axis robot motor 33a, the Y-axis robot motor 34a, and the Z-axis robot motor 35a in step S305 based on the correction result of the coordinates. 33a, 34a, and 35a are driven, and the tip of the nozzle part 27b of the discharge part 26 is inserted into the storage part 62.

  On the other hand, when performing the coating operation, the path number, coating height, and sweep speed are input from the control unit 10 to the CPU 31 of the three-axis robot 30 in step S302. Then, the CPU 31 reads the route pattern from the storage device 32 in step S303, and corrects the coordinates in step S304. The CPU 31 derives a drive command for each of the X-axis robot motor 33a, the Y-axis robot motor 34a, and the Z-axis robot motor 35a in step S305 based on the correction result of the coordinates. 33a, 34a, and 35a are driven to perform the coating operation.

  As described above, in the liquid material application apparatus 1 according to the present embodiment, the visual sensor 40, the displacement sensor 54, and the control unit 10 select application conditions suitable for the workpiece, and the discharge unit 20 and Since the three-axis robot 30 is controlled, it is possible to apply a liquid material according to the workpiece, and it is possible to improve yield, improve product performance, and reliability. Further, since the type of the workpiece is automatically specified by the visual sensor 40, the production efficiency is improved, and the height of the workpiece is automatically detected by the displacement sensor 54. In contrast, the coating conditions can be optimized. Furthermore, since the previous application area is measured and stored by the visual sensor 40, feedback can be applied at the next application, and the application conditions can be further optimized. In addition, since the elapsed time between actions (coating / cleaning / stopping) can be measured by the timer 13, the cycle time can be shortened and the state of the liquid material and the discharge unit can be maintained by collating with pre-registered information. It becomes possible to achieve both.

  In the above-described embodiment, the discharge of the liquid material for sealing the electronic component by applying the liquid material that reacts with moisture in the air and cures to the electronic component mounted on the circuit board as the workpiece. The apparatus, the coating apparatus including the apparatus, and the coating method have been described as examples, but the application target of the present invention is not limited to this. For example, the present invention can be applied to a discharge device that performs adhesion instead of sealing, a coating apparatus including the same, and a coating method, and the workpiece is not limited to a circuit board or an electronic component.

  Thus, the one embodiment disclosed this time is illustrative in all respects and is not restrictive. The technical scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a schematic perspective view which shows the external appearance structure of the coating device of the liquid material in embodiment of this invention. It is a block diagram which shows the structure of the function part of the coating device of the liquid material in embodiment of this invention. It is a schematic cross section which shows the structure of the discharge part of the coating device of the liquid material in embodiment of this invention. It is a schematic cross section which shows the state which inserted the front-end | tip of the nozzle part in the 2nd hardening prevention liquid with which the storage part was filled in the coating device of the liquid material in embodiment of this invention. It is a schematic cross section which shows the modification of the discharge part of the coating device of the liquid material in embodiment of this invention. It is a figure which shows the concept of application | coating control of the coating device of the liquid material in embodiment of this invention. It is a flowchart which shows operation | movement of the coating device of the liquid material in embodiment of this invention. It is a more detailed flowchart when the specific operation | movement contained in the operation | movement flow of the coating device of the liquid material in embodiment of this invention is seen as input / output with respect to CPU of a control unit. It is a block diagram which shows the input / output condition with respect to CPU of the control unit in each operation | movement shown in the specific operation | movement flow shown in FIG. It is a more detailed flowchart at the time of seeing the specific operation | movement contained in the operation | movement flow of the coating device of the liquid material in this Embodiment as input / output with respect to CPU of a visual sensor. It is a block diagram which shows the input / output condition with respect to CPU of the visual sensor in the case of each operation | movement shown in the specific operation | movement flow shown in FIG. FIG. 5 is a more detailed flow chart when a specific operation included in the operation flow of the liquid material application device in the present embodiment is viewed as an input / output to / from the CPU of the three-axis robot. FIG. 13 is a block diagram showing an input / output situation with respect to the CPU of the three-axis robot in each operation shown in the specific operation flow shown in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Application | coating apparatus of liquid material, 10 control unit, 11 CPU, 12 memory | storage device, 13 timer, 14 operation part, 15 display part, 20 discharge unit, 21 CPU, 22 memory | storage device, 23 pressurization pump, 23 'drive motor, 24 valve, 25 pressure sensor, 26, 26 'discharge part, 27a syringe part, 27a1 air, 27b nozzle part, 27b1 discharge port, 27c cap part, 27c1 through hole, 28 tube, 29 piston, 30 triaxial robot, 31 CPU , 32 storage device, 33 X-axis robot, 33a X-axis robot motor, 34 Y-axis robot, 34a Y-axis robot motor, 35 Z-axis robot, 35a Z-axis robot motor, 40 visual sensor, 41 CPU, 42 storage Device, 43 image processing device, 44 camera, 52 illumination device , 54 Displacement sensor, 60 units, 61 Placement part, 62 Storage part, 64 Cleaning sponge, 66 Application amount detection part, 70 Liquid material, 81 1st hardening prevention liquid, 82 2nd hardening prevention liquid.

Claims (15)

A liquid material that cures by reacting with moisture in the air, and a syringe unit that stores a first curing preventing liquid that prevents the liquid material from curing by forming a layer on the liquid surface of the liquid material;
A nozzle part located below the syringe part and provided with a discharge port communicating with the syringe part;
A liquid material discharge apparatus comprising: a pressure unit that discharges the liquid material from the discharge port by pressurizing and pressing down the liquid surface of the first curing preventing liquid. The liquid material is a silicon adhesive or a cyanoacrylate adhesive,
2. The liquid material discharge device according to claim 1, wherein the first curing preventing liquid contains at least one selected from the group consisting of alcohol, glycol, aromatic hydrocarbon, liquid paraffin, and oleic acid as a component. . The liquid material is a silicon adhesive or a cyanoacrylate adhesive,
The liquid material ejection device according to claim 1, wherein the first curing preventing liquid contains normal butanol as a main component.   The liquid material according to claim 1, further comprising a storage portion in which a second curing preventing liquid that blocks the discharge port when the nozzle portion is inserted and thereby prevents the liquid material from being cured is stored. Discharge device. The liquid material is a silicon adhesive or a cyanoacrylate adhesive,
5. The liquid material ejection device according to claim 4, wherein the second curing preventing liquid contains at least one selected from the group consisting of alcohol, glycol, aromatic hydrocarbon, liquid paraffin, and oleic acid as a component. . The liquid material is a silicon adhesive or a cyanoacrylate adhesive,
The liquid material ejection device according to claim 4, wherein the second curing preventing liquid contains normal butanol as a main component.   The liquid material discharge apparatus according to claim 1, wherein the pressurizing unit includes a compressed air supply unit configured to supply compressed air to the syringe unit.   The liquid material discharge device according to claim 1, wherein the pressurizing unit includes a piston slidably inserted into the syringe unit, and a driving unit that drives the piston. A liquid material discharge device according to any one of claims 1 to 8,
A placement unit for placing an application object to which the liquid material discharged from the discharge device is applied;
A moving mechanism for relatively moving the discharge device and the placement unit;
Detecting means for detecting information about the application object;
An apparatus for applying a liquid material, comprising: a control unit that controls the ejection device and the moving mechanism based on information on the application target detected by the detection unit. A liquid material application method for applying a liquid material that reacts with moisture in the air and cures to a coating object,
Filling the syringe part with the liquid material;
Filling the syringe part with a first curing preventing liquid for preventing the liquid material from being hardened by forming a layer on the liquid surface of the liquid material;
The liquid material is discharged from a discharge port provided in a nozzle part located below the syringe part by pressurizing and lowering the liquid surface of the first curing preventing liquid, and thereby the liquid material is applied to the application object. Applying the material. A method for applying the liquid material. The liquid material is a silicon adhesive or a cyanoacrylate adhesive,
The method for applying a liquid material according to claim 10, wherein the first curing preventing liquid contains at least one selected from the group consisting of alcohol, glycol, aromatic hydrocarbon, liquid paraffin, and oleic acid as a component. . The liquid material is a silicon adhesive or a cyanoacrylate adhesive,
The coating method of the liquid material of Claim 10 with which the said 1st hardening prevention liquid contains normal butanol as a main component.   After the syringe part is filled with the liquid material and the first curing prevention liquid and in a standby state where the liquid material is not applied to the application target, the storage part in which the second curing prevention liquid is stored The liquid material application method according to claim 10, further comprising a step of closing the discharge port with the second curing preventing liquid by inserting the nozzle portion, thereby preventing the liquid material from curing. The liquid material is a silicon adhesive or a cyanoacrylate adhesive,
The liquid material coating method according to claim 13, wherein the second curing preventing liquid contains at least one selected from the group consisting of alcohol, glycol, aromatic hydrocarbon, liquid paraffin, and oleic acid as a component. . The liquid material is a silicon adhesive or a cyanoacrylate adhesive,
The liquid material coating method according to claim 13, wherein the second curing preventing liquid contains normal butanol as a main component.

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