JP3573004B2 - Syringe device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a syringe device, and more particularly, to a syringe device that automatically supplies a viscous material into a chamber and stably discharges a viscous material such as an adhesive or cream solder from a nozzle.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, for example, a syringe device that discharges a viscous material such as UV silicone in a bead shape has been used to seal a mating surface of a mobile phone. In such a syringe device, it is required to maintain the discharge amount of the viscous material in a stable state, and it is necessary to perform the work of replenishing the viscous material quickly and easily in order to maintain good mass productivity. Therefore, there has been proposed an apparatus capable of automatically supplying a viscous material into a chamber every time a predetermined amount of viscous material is discharged (for example, Japanese Patent Application Laid-Open No. 10-272409).
[0003]
As shown in FIG. 3, a syringe device 50 disclosed in the publication includes a first syringe 51 for discharging and a second syringe 54 connected to the first syringe 51 via a conduction tube 52. And a valve 55 that opens and closes the conduit 52. The first syringe 51 is connected to a syringe main body 57 having a chamber 56 for accommodating the viscous material M, a piston 58 that penetrates the conduction tube 52 and can move up and down in the syringe main body 57, and the chamber 56. A suitable nozzle 59 and a ventilation path 60 for adjusting the pressure in the syringe body 57 are provided.
[0004]
In this syringe device 50, the viscous material M in the chamber 56 of the first syringe 51 is discharged from the nozzle 59 by applying a positive pressure to the ventilation path 60 and pushing down the piston 58. After the predetermined amount of the viscous material M is discharged, the valve 55 is opened, and a negative pressure is applied from the air passage 60 into the first syringe 51, whereby the piston 58 is raised, and the viscous material M From the syringe 54 through the conduit 52.
[0005]
[Problems to be solved by the invention]
However, in the configuration of the syringe device 50, an unpredictable load such as a sliding resistance in the vertical movement of the piston 58 and a pressure in the chamber 56 tends to be applied during the supply of the viscous material and the standby for discharge. Become. For this reason, it is extremely difficult to adjust the negative pressure by the ventilation path 60, and when the negative pressure is applied in a weak state, as shown in FIGS. There is a strong tendency to be in a so-called liquid dripping state that hangs down from the tip of the liquid. When discharge is performed in such a state, the width and height of the viscous material M at the discharge start point and the discharge end point become non-uniform, and irregularities are formed in a portion connecting these, and, as a result, good sealing accuracy is maintained. Causes inconvenience that it becomes difficult.
[0006]
If the piston 58 is not mounted to avoid the above-described problem, the replenished viscous material M is replenished from the central portion of the first syringe 51 to the lower portion thereof. If the material stays without being used for a long period of time, the viscous material M itself may be deteriorated, which may adversely affect the seal. In particular, when the viscous material M is a photocurable resin or an anaerobic curable resin, there is a possibility that the viscous material M will be cured in the syringe.
[0007]
[Object of the invention]
The present invention has been devised in view of such inconvenience, and its object is to discharge the viscous material to be discharged while maintaining the start point and the end point in a uniform state. It is another object of the present invention to provide a syringe device which does not cause a stagnation of the filled material.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a syringe body provided with a chamber for accommodating a viscous material, an air passage connected to an upper end of the syringe body and capable of introducing a positive pressure or a negative pressure to the viscous material. A syringe device provided with a flow path for supplying a viscous material into the chamber, and a nozzle provided on a distal end side of the syringe body and communicating with the chamber, wherein the flow path for supplying the viscous material is a syringe body The downstream end of the flow path is bent just above the nozzle in the chamber, and the supply port, which is the end of the flow path, is directed in a direction different from the discharge direction of the nozzle. It has a configuration. With such a configuration, when the viscous material is supplied into the chamber, the old viscous material does not stay in the chamber, and the supply of the viscous material does not directly affect the applied material. it can. Thus, the viscous material is discharged while maintaining a uniform state at the application start point and the application end point, and it is possible to eliminate factors such as poor sole accuracy.
[0009]
Further, according to the present invention, the viscous material supplied into the chamber from the flow path does not generate stagnation in the chamber and is discharged in the order of supply. Without remaining, the possibility that the viscous material is degraded in the chamber can be eliminated.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
【Example】
Next, embodiments of the present invention will be described with reference to the drawings.
[0011]
FIG. 1 is a schematic front sectional view of the syringe device according to the present embodiment. In this figure, a syringe device 10 includes a syringe main body 12 having a chamber 11 for accommodating a viscous material M, a flow path 15 for supplying the viscous material M into the chamber 11, and a syringe body 10 provided on the distal end side of the syringe main body 12. And a ventilation path 17 for supplying a positive pressure or a negative pressure to the chamber 11 in the syringe body 12. Here, the viscous material M used in the present invention is not particularly limited.
[0012]
In the present embodiment, the syringe body 12 is set to have a capacity of about 30 cc. The syringe main body 12 includes a peripheral wall 12A formed in a substantially cylindrical shape extending in the vertical direction in the figure, and a tapered bottom wall 12B connected to the lower peripheral edge of the peripheral wall 12A. Has become. A spacer tube 21 suitable for the chamber 11 is provided on the bottom wall 12B, and the nozzle 16 is provided on the outer periphery of a lower portion of the spacer tube 21. Further, a flange 22 formed so as to protrude in the radial direction is provided on the outer peripheral surface on the upper end side of the bottom wall 12B, and a cover member 25 is attached so as to sandwich the flange 22 from above and below.
[0013]
The cover member 25 includes an insertion portion 26 housed in the syringe main body 12 so as to be in close contact therewith, an O-ring 27 provided on an outer peripheral side of the insertion portion 26, and is provided continuously above the insertion portion 26. A lid 28 is formed with a diameter larger than the maximum width of the flange 22, and a fixing member 30 that sandwiches the flange 22 with screws 29 together with the lower surface of the lid 28. A through hole 32 having an inner diameter substantially the same as the outer diameter of the flow path 15 is formed at the axial center position of the cover member 25, and the flow path 15 communicates with the flow path 15.
[0014]
The flow path 15 is connected to a tank (not shown) and a pump (not shown) that supply the viscous material M in response to a supply command signal given from a sensor described later. The flow path 15 is inserted through the through-hole 32 and is disposed in parallel with the syringe body. The downstream end 15A of the flow path 15 is provided immediately above the nozzle in the chamber. The downstream end of the flow path is bent just above the nozzle in the chamber 11, and the supply port 35, which is the end of the flow path, faces in a direction different from the discharge direction of the nozzle 16. In the figure, the downstream end 15A is bent approximately 180 degrees, and the supply port 35 is directed upward. The bending at the downstream end is preferably bent at least 90 degrees with respect to the ejection direction of the nozzle. Since the lower supply port 35 in FIG. 1 is directed upward, the supplied viscous material M is always replenished upward from the supply port 35 into the chamber 11. Here, a sensor 37 for detecting a water level height position of the viscous material M is provided around the chamber 11 at a position below the cover member 25.
[0015]
The sensor 37 is disposed on the right side in FIG. 1 and detects a water level of the viscous material M. The bell sensor 39 is located above the level sensor 39 and has a viscosity as a spare when the level sensor 39 does not operate due to some trouble. An overrun sensor 40 for detecting the water level of the material M is provided. Thus, the level sensor 39 detects the water level of the viscous material M and gives the supply command signal and the supply stop signal of the viscous material M to the tank, so that the viscous material M in the chamber 11 is always maintained at a predetermined range. Will be done.
[0016]
The nozzle 16 includes a discharge pipe 41 and a cap nut-shaped fixing portion 42 that forms the discharge pipe 41 and is mounted on the spacer cylinder 21. The opening diameter of the discharge pipe 41 is not particularly limited, but is set in the range of 0.2 mm to 2.2 mm in the present embodiment. The nozzle 16 is provided with a support member 45 mounted on a robot (not shown), and controls the robot so that the syringe device 10 can be moved to a predetermined discharge position.
[0017]
The ventilation passage 17 is connected to a pump (not shown) provided so as to be capable of intake and exhaust, and communicates with the inside of the syringe body 12 from the outer surface side of the cover member 25. The ventilation path 17 adjusts the air pressure in the sealed space 46 between the viscous material M in the syringe body 12 and the cover member 25, that is, applies a positive pressure to move the viscous material M in the chamber from the nozzle 16. Can be ejected.
[0018]
The robot that supports the ventilation path 17, the sensor 37, and the syringe device 10 in the present embodiment is entirely controlled via a control device (not shown).
[0019]
Next, the overall operation of the present embodiment will be described.
[0020]
Here, the syringe device 10 is assumed to teach the discharge position of the viscous material M along a preset locus, and the viscous material M is set in the chamber 11 as shown in FIG. It is assumed that the upper limit amount is accommodated and the first discharge operation is performed. In such a state, the discharge operation is performed by discharging the viscous material M from the discharge pipe 41 by applying a positive pressure to the sealed space 46 from the ventilation path 17. When the discharge operation is completed and the apparatus is on standby for the next discharge operation, a very weak negative pressure is applied from the air passage 17 in order to prevent the viscous material M from dripping from the discharge pipe 41. When the water level of the viscous material M falls to the position shown in FIG. 2 with the decrease of the viscous material M in the chamber 11 by repeatedly performing the discharge operation, the level sensor 39 detects this position and detects the position. After the completion of the discharge operation performed at the time, a supply command signal is given to the tank, the viscous material M is supplied into the chamber 11 through the flow path 15, and the internal pressure in the chamber 11 is suppressed from rising. A possible relatively strong negative pressure is applied from the ventilation channel 17 into the enclosed space 46. Then, when the viscous material M is replenished, the water level rises and reaches the height shown in FIG. 1, and the level sensor 39 detects this position, whereby the supply of the viscous material M and the negative pressure from the ventilation path 17 are performed. Stop applying pressure.
[0021]
Therefore, according to such an embodiment, the above-described operation of discharging and supplying the viscous material M can be automatically and repeatedly performed as a series of steps. In addition, at the time of discharge standby of the viscous material M and at the time of replenishment, since the discharge material M does not hang down from the discharge pipe 41 due to the negative pressure adjustment of the ventilation path 17, the start point and the end point of the discharge are uniform. The effect of being secured is obtained.
[0022]
In the above embodiment it has been described as a separate step the step of supplying the process and the syringe body for discharging the viscous material, but if desired, adjusting strictly the balance of the supply pressure from the air passage 17 and the passage 15 Thereby, the discharging step and the supplying step can be performed simultaneously. These steps may be carried out partially partially the beginning of a portion of the end of the discharge process supply step at the same time, it is also possible to carry out all steps simultaneously.
[0023]
The viscous material M is supplied from a supply port 35, which is the tip of the downstream end 15A installed on the upper surface in the chamber. The flow path 15 is inserted in parallel with the syringe body, and the downstream end 15A is bent 180 degrees in the chamber and is arranged upward. As a result, the viscous material M flows downward through the flow path 15 and is discharged upward from the supply port 35. The discharged viscous material M flows upward, convection occurs near the liquid surface, flows downward, and is finally discharged from the nozzle 16. Therefore, since there is no stagnation of the viscous material M in the chamber, a new material can always be supplied. Therefore, the material does not deteriorate in the chamber, and the original properties of the material do not deteriorate after the material is applied.
[0024]
Further, if a gas such as air is mixed in the material to be discharged, an accurate discharge amount cannot be controlled. According to the configuration of the present application, when filling the viscous material M into the syringe body 12, air is not entrained. Further, even if air enters the viscous material M due to an unexpected cause before passing through the flow path 15 such as a pump or a tank, the air escapes from the viscous material M in the process of flowing upward from the supply port 35 and the nozzle 16 When discharged, air can be prevented from being mixed.
[0025]
Furthermore, according to the configuration of the present application, the supplied viscous material M is supplied into the syringe main body 12 in a direction opposite to the discharge direction of the nozzle 16, so that the supplied pressure directly affects the discharge. Nothing. This is particularly effective when the discharge step and the supply step overlap. Therefore, a stable ejection amount can be maintained.
[0026]
【The invention's effect】
As described above, according to the present invention, the ejection amount can be always kept constant. Further, it is possible to prevent the viscous material from protruding or becoming dirty from the nozzle at the time of the supply, and to obtain an effect that the accuracy of the discharge can be sufficiently secured. Further, when the discharge and supply operations are repeatedly performed, it is possible to effectively avoid the possibility that the old viscous material remains in the chamber and deteriorates.
[Brief description of the drawings]
FIG. 1 is a schematic front sectional view of a syringe device according to the present embodiment.
FIG. 2 is a schematic front sectional view showing a state of the syringe device of FIG. 1 after discharging a viscous material.
FIG. 3 is a schematic front sectional view of a conventional syringe device.
FIGS. 4A to 4C are schematic diagrams showing a state in which nozzles are dripped.
[Explanation of symbols]
Reference Signs List 10 Syringe device 11 Chamber 12 Syringe body 15 Flow path 16 Nozzle 17 Ventilation path M

Claims (1)

A syringe body having a chamber for accommodating a viscous material, a ventilation path connected to an upper end of the syringe body and capable of introducing a positive pressure or a negative pressure to the viscous material, and a flow path for supplying the viscous material into the chamber And a syringe device provided on the distal end side of the syringe body and having a nozzle communicating with the chamber, wherein the flow path for supplying the viscous material is inserted in parallel with the syringe body, and the downstream end of the flow path is A syringe device which is bent just above the nozzle in the chamber, and a supply port which is the end of the flow path is directed in a direction different from a discharge direction of the nozzle.

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